updated vendor
This commit is contained in:
-27
@@ -1,27 +0,0 @@
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||||
Copyright (c) 2017 The Go Authors. All rights reserved.
|
||||
|
||||
Redistribution and use in source and binary forms, with or without
|
||||
modification, are permitted provided that the following conditions are
|
||||
met:
|
||||
|
||||
* Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
* Redistributions in binary form must reproduce the above
|
||||
copyright notice, this list of conditions and the following disclaimer
|
||||
in the documentation and/or other materials provided with the
|
||||
distribution.
|
||||
* Neither the name of Google Inc. nor the names of its
|
||||
contributors may be used to endorse or promote products derived from
|
||||
this software without specific prior written permission.
|
||||
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
-671
@@ -1,671 +0,0 @@
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||||
// Copyright 2017, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Package cmp determines equality of values.
|
||||
//
|
||||
// This package is intended to be a more powerful and safer alternative to
|
||||
// [reflect.DeepEqual] for comparing whether two values are semantically equal.
|
||||
// It is intended to only be used in tests, as performance is not a goal and
|
||||
// it may panic if it cannot compare the values. Its propensity towards
|
||||
// panicking means that its unsuitable for production environments where a
|
||||
// spurious panic may be fatal.
|
||||
//
|
||||
// The primary features of cmp are:
|
||||
//
|
||||
// - When the default behavior of equality does not suit the test's needs,
|
||||
// custom equality functions can override the equality operation.
|
||||
// For example, an equality function may report floats as equal so long as
|
||||
// they are within some tolerance of each other.
|
||||
//
|
||||
// - Types with an Equal method (e.g., [time.Time.Equal]) may use that method
|
||||
// to determine equality. This allows package authors to determine
|
||||
// the equality operation for the types that they define.
|
||||
//
|
||||
// - If no custom equality functions are used and no Equal method is defined,
|
||||
// equality is determined by recursively comparing the primitive kinds on
|
||||
// both values, much like [reflect.DeepEqual]. Unlike [reflect.DeepEqual],
|
||||
// unexported fields are not compared by default; they result in panics
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// unless suppressed by using an [Ignore] option
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// (see [github.com/google/go-cmp/cmp/cmpopts.IgnoreUnexported])
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// or explicitly compared using the [Exporter] option.
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package cmp
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import (
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"fmt"
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"reflect"
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"strings"
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|
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"github.com/google/go-cmp/cmp/internal/diff"
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"github.com/google/go-cmp/cmp/internal/function"
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"github.com/google/go-cmp/cmp/internal/value"
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||||
)
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|
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// TODO(≥go1.18): Use any instead of interface{}.
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|
||||
// Equal reports whether x and y are equal by recursively applying the
|
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// following rules in the given order to x and y and all of their sub-values:
|
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//
|
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// - Let S be the set of all [Ignore], [Transformer], and [Comparer] options that
|
||||
// remain after applying all path filters, value filters, and type filters.
|
||||
// If at least one [Ignore] exists in S, then the comparison is ignored.
|
||||
// If the number of [Transformer] and [Comparer] options in S is non-zero,
|
||||
// then Equal panics because it is ambiguous which option to use.
|
||||
// If S contains a single [Transformer], then use that to transform
|
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// the current values and recursively call Equal on the output values.
|
||||
// If S contains a single [Comparer], then use that to compare the current values.
|
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// Otherwise, evaluation proceeds to the next rule.
|
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//
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||||
// - If the values have an Equal method of the form "(T) Equal(T) bool" or
|
||||
// "(T) Equal(I) bool" where T is assignable to I, then use the result of
|
||||
// x.Equal(y) even if x or y is nil. Otherwise, no such method exists and
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// evaluation proceeds to the next rule.
|
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//
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// - Lastly, try to compare x and y based on their basic kinds.
|
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// Simple kinds like booleans, integers, floats, complex numbers, strings,
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// and channels are compared using the equivalent of the == operator in Go.
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// Functions are only equal if they are both nil, otherwise they are unequal.
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//
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// Structs are equal if recursively calling Equal on all fields report equal.
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// If a struct contains unexported fields, Equal panics unless an [Ignore] option
|
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// (e.g., [github.com/google/go-cmp/cmp/cmpopts.IgnoreUnexported]) ignores that field
|
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// or the [Exporter] option explicitly permits comparing the unexported field.
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//
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// Slices are equal if they are both nil or both non-nil, where recursively
|
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// calling Equal on all non-ignored slice or array elements report equal.
|
||||
// Empty non-nil slices and nil slices are not equal; to equate empty slices,
|
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// consider using [github.com/google/go-cmp/cmp/cmpopts.EquateEmpty].
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//
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// Maps are equal if they are both nil or both non-nil, where recursively
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// calling Equal on all non-ignored map entries report equal.
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// Map keys are equal according to the == operator.
|
||||
// To use custom comparisons for map keys, consider using
|
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// [github.com/google/go-cmp/cmp/cmpopts.SortMaps].
|
||||
// Empty non-nil maps and nil maps are not equal; to equate empty maps,
|
||||
// consider using [github.com/google/go-cmp/cmp/cmpopts.EquateEmpty].
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//
|
||||
// Pointers and interfaces are equal if they are both nil or both non-nil,
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// where they have the same underlying concrete type and recursively
|
||||
// calling Equal on the underlying values reports equal.
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||||
//
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||||
// Before recursing into a pointer, slice element, or map, the current path
|
||||
// is checked to detect whether the address has already been visited.
|
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// If there is a cycle, then the pointed at values are considered equal
|
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// only if both addresses were previously visited in the same path step.
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func Equal(x, y interface{}, opts ...Option) bool {
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s := newState(opts)
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s.compareAny(rootStep(x, y))
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return s.result.Equal()
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}
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|
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// Diff returns a human-readable report of the differences between two values:
|
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// y - x. It returns an empty string if and only if Equal returns true for the
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// same input values and options.
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//
|
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// The output is displayed as a literal in pseudo-Go syntax.
|
||||
// At the start of each line, a "-" prefix indicates an element removed from x,
|
||||
// a "+" prefix to indicates an element added from y, and the lack of a prefix
|
||||
// indicates an element common to both x and y. If possible, the output
|
||||
// uses fmt.Stringer.String or error.Error methods to produce more humanly
|
||||
// readable outputs. In such cases, the string is prefixed with either an
|
||||
// 's' or 'e' character, respectively, to indicate that the method was called.
|
||||
//
|
||||
// Do not depend on this output being stable. If you need the ability to
|
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// programmatically interpret the difference, consider using a custom Reporter.
|
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func Diff(x, y interface{}, opts ...Option) string {
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s := newState(opts)
|
||||
|
||||
// Optimization: If there are no other reporters, we can optimize for the
|
||||
// common case where the result is equal (and thus no reported difference).
|
||||
// This avoids the expensive construction of a difference tree.
|
||||
if len(s.reporters) == 0 {
|
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s.compareAny(rootStep(x, y))
|
||||
if s.result.Equal() {
|
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return ""
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||||
}
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s.result = diff.Result{} // Reset results
|
||||
}
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||||
|
||||
r := new(defaultReporter)
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s.reporters = append(s.reporters, reporter{r})
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s.compareAny(rootStep(x, y))
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||||
d := r.String()
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if (d == "") != s.result.Equal() {
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||||
panic("inconsistent difference and equality results")
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||||
}
|
||||
return d
|
||||
}
|
||||
|
||||
// rootStep constructs the first path step. If x and y have differing types,
|
||||
// then they are stored within an empty interface type.
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||||
func rootStep(x, y interface{}) PathStep {
|
||||
vx := reflect.ValueOf(x)
|
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vy := reflect.ValueOf(y)
|
||||
|
||||
// If the inputs are different types, auto-wrap them in an empty interface
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||||
// so that they have the same parent type.
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||||
var t reflect.Type
|
||||
if !vx.IsValid() || !vy.IsValid() || vx.Type() != vy.Type() {
|
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t = anyType
|
||||
if vx.IsValid() {
|
||||
vvx := reflect.New(t).Elem()
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||||
vvx.Set(vx)
|
||||
vx = vvx
|
||||
}
|
||||
if vy.IsValid() {
|
||||
vvy := reflect.New(t).Elem()
|
||||
vvy.Set(vy)
|
||||
vy = vvy
|
||||
}
|
||||
} else {
|
||||
t = vx.Type()
|
||||
}
|
||||
|
||||
return &pathStep{t, vx, vy}
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||||
}
|
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|
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type state struct {
|
||||
// These fields represent the "comparison state".
|
||||
// Calling statelessCompare must not result in observable changes to these.
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||||
result diff.Result // The current result of comparison
|
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curPath Path // The current path in the value tree
|
||||
curPtrs pointerPath // The current set of visited pointers
|
||||
reporters []reporter // Optional reporters
|
||||
|
||||
// recChecker checks for infinite cycles applying the same set of
|
||||
// transformers upon the output of itself.
|
||||
recChecker recChecker
|
||||
|
||||
// dynChecker triggers pseudo-random checks for option correctness.
|
||||
// It is safe for statelessCompare to mutate this value.
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dynChecker dynChecker
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||||
|
||||
// These fields, once set by processOption, will not change.
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||||
exporters []exporter // List of exporters for structs with unexported fields
|
||||
opts Options // List of all fundamental and filter options
|
||||
}
|
||||
|
||||
func newState(opts []Option) *state {
|
||||
// Always ensure a validator option exists to validate the inputs.
|
||||
s := &state{opts: Options{validator{}}}
|
||||
s.curPtrs.Init()
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||||
s.processOption(Options(opts))
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return s
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||||
}
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||||
|
||||
func (s *state) processOption(opt Option) {
|
||||
switch opt := opt.(type) {
|
||||
case nil:
|
||||
case Options:
|
||||
for _, o := range opt {
|
||||
s.processOption(o)
|
||||
}
|
||||
case coreOption:
|
||||
type filtered interface {
|
||||
isFiltered() bool
|
||||
}
|
||||
if fopt, ok := opt.(filtered); ok && !fopt.isFiltered() {
|
||||
panic(fmt.Sprintf("cannot use an unfiltered option: %v", opt))
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||||
}
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||||
s.opts = append(s.opts, opt)
|
||||
case exporter:
|
||||
s.exporters = append(s.exporters, opt)
|
||||
case reporter:
|
||||
s.reporters = append(s.reporters, opt)
|
||||
default:
|
||||
panic(fmt.Sprintf("unknown option %T", opt))
|
||||
}
|
||||
}
|
||||
|
||||
// statelessCompare compares two values and returns the result.
|
||||
// This function is stateless in that it does not alter the current result,
|
||||
// or output to any registered reporters.
|
||||
func (s *state) statelessCompare(step PathStep) diff.Result {
|
||||
// We do not save and restore curPath and curPtrs because all of the
|
||||
// compareX methods should properly push and pop from them.
|
||||
// It is an implementation bug if the contents of the paths differ from
|
||||
// when calling this function to when returning from it.
|
||||
|
||||
oldResult, oldReporters := s.result, s.reporters
|
||||
s.result = diff.Result{} // Reset result
|
||||
s.reporters = nil // Remove reporters to avoid spurious printouts
|
||||
s.compareAny(step)
|
||||
res := s.result
|
||||
s.result, s.reporters = oldResult, oldReporters
|
||||
return res
|
||||
}
|
||||
|
||||
func (s *state) compareAny(step PathStep) {
|
||||
// Update the path stack.
|
||||
s.curPath.push(step)
|
||||
defer s.curPath.pop()
|
||||
for _, r := range s.reporters {
|
||||
r.PushStep(step)
|
||||
defer r.PopStep()
|
||||
}
|
||||
s.recChecker.Check(s.curPath)
|
||||
|
||||
// Cycle-detection for slice elements (see NOTE in compareSlice).
|
||||
t := step.Type()
|
||||
vx, vy := step.Values()
|
||||
if si, ok := step.(SliceIndex); ok && si.isSlice && vx.IsValid() && vy.IsValid() {
|
||||
px, py := vx.Addr(), vy.Addr()
|
||||
if eq, visited := s.curPtrs.Push(px, py); visited {
|
||||
s.report(eq, reportByCycle)
|
||||
return
|
||||
}
|
||||
defer s.curPtrs.Pop(px, py)
|
||||
}
|
||||
|
||||
// Rule 1: Check whether an option applies on this node in the value tree.
|
||||
if s.tryOptions(t, vx, vy) {
|
||||
return
|
||||
}
|
||||
|
||||
// Rule 2: Check whether the type has a valid Equal method.
|
||||
if s.tryMethod(t, vx, vy) {
|
||||
return
|
||||
}
|
||||
|
||||
// Rule 3: Compare based on the underlying kind.
|
||||
switch t.Kind() {
|
||||
case reflect.Bool:
|
||||
s.report(vx.Bool() == vy.Bool(), 0)
|
||||
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
||||
s.report(vx.Int() == vy.Int(), 0)
|
||||
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
||||
s.report(vx.Uint() == vy.Uint(), 0)
|
||||
case reflect.Float32, reflect.Float64:
|
||||
s.report(vx.Float() == vy.Float(), 0)
|
||||
case reflect.Complex64, reflect.Complex128:
|
||||
s.report(vx.Complex() == vy.Complex(), 0)
|
||||
case reflect.String:
|
||||
s.report(vx.String() == vy.String(), 0)
|
||||
case reflect.Chan, reflect.UnsafePointer:
|
||||
s.report(vx.Pointer() == vy.Pointer(), 0)
|
||||
case reflect.Func:
|
||||
s.report(vx.IsNil() && vy.IsNil(), 0)
|
||||
case reflect.Struct:
|
||||
s.compareStruct(t, vx, vy)
|
||||
case reflect.Slice, reflect.Array:
|
||||
s.compareSlice(t, vx, vy)
|
||||
case reflect.Map:
|
||||
s.compareMap(t, vx, vy)
|
||||
case reflect.Ptr:
|
||||
s.comparePtr(t, vx, vy)
|
||||
case reflect.Interface:
|
||||
s.compareInterface(t, vx, vy)
|
||||
default:
|
||||
panic(fmt.Sprintf("%v kind not handled", t.Kind()))
|
||||
}
|
||||
}
|
||||
|
||||
func (s *state) tryOptions(t reflect.Type, vx, vy reflect.Value) bool {
|
||||
// Evaluate all filters and apply the remaining options.
|
||||
if opt := s.opts.filter(s, t, vx, vy); opt != nil {
|
||||
opt.apply(s, vx, vy)
|
||||
return true
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func (s *state) tryMethod(t reflect.Type, vx, vy reflect.Value) bool {
|
||||
// Check if this type even has an Equal method.
|
||||
m, ok := t.MethodByName("Equal")
|
||||
if !ok || !function.IsType(m.Type, function.EqualAssignable) {
|
||||
return false
|
||||
}
|
||||
|
||||
eq := s.callTTBFunc(m.Func, vx, vy)
|
||||
s.report(eq, reportByMethod)
|
||||
return true
|
||||
}
|
||||
|
||||
func (s *state) callTRFunc(f, v reflect.Value, step Transform) reflect.Value {
|
||||
if !s.dynChecker.Next() {
|
||||
return f.Call([]reflect.Value{v})[0]
|
||||
}
|
||||
|
||||
// Run the function twice and ensure that we get the same results back.
|
||||
// We run in goroutines so that the race detector (if enabled) can detect
|
||||
// unsafe mutations to the input.
|
||||
c := make(chan reflect.Value)
|
||||
go detectRaces(c, f, v)
|
||||
got := <-c
|
||||
want := f.Call([]reflect.Value{v})[0]
|
||||
if step.vx, step.vy = got, want; !s.statelessCompare(step).Equal() {
|
||||
// To avoid false-positives with non-reflexive equality operations,
|
||||
// we sanity check whether a value is equal to itself.
|
||||
if step.vx, step.vy = want, want; !s.statelessCompare(step).Equal() {
|
||||
return want
|
||||
}
|
||||
panic(fmt.Sprintf("non-deterministic function detected: %s", function.NameOf(f)))
|
||||
}
|
||||
return want
|
||||
}
|
||||
|
||||
func (s *state) callTTBFunc(f, x, y reflect.Value) bool {
|
||||
if !s.dynChecker.Next() {
|
||||
return f.Call([]reflect.Value{x, y})[0].Bool()
|
||||
}
|
||||
|
||||
// Swapping the input arguments is sufficient to check that
|
||||
// f is symmetric and deterministic.
|
||||
// We run in goroutines so that the race detector (if enabled) can detect
|
||||
// unsafe mutations to the input.
|
||||
c := make(chan reflect.Value)
|
||||
go detectRaces(c, f, y, x)
|
||||
got := <-c
|
||||
want := f.Call([]reflect.Value{x, y})[0].Bool()
|
||||
if !got.IsValid() || got.Bool() != want {
|
||||
panic(fmt.Sprintf("non-deterministic or non-symmetric function detected: %s", function.NameOf(f)))
|
||||
}
|
||||
return want
|
||||
}
|
||||
|
||||
func detectRaces(c chan<- reflect.Value, f reflect.Value, vs ...reflect.Value) {
|
||||
var ret reflect.Value
|
||||
defer func() {
|
||||
recover() // Ignore panics, let the other call to f panic instead
|
||||
c <- ret
|
||||
}()
|
||||
ret = f.Call(vs)[0]
|
||||
}
|
||||
|
||||
func (s *state) compareStruct(t reflect.Type, vx, vy reflect.Value) {
|
||||
var addr bool
|
||||
var vax, vay reflect.Value // Addressable versions of vx and vy
|
||||
|
||||
var mayForce, mayForceInit bool
|
||||
step := StructField{&structField{}}
|
||||
for i := 0; i < t.NumField(); i++ {
|
||||
step.typ = t.Field(i).Type
|
||||
step.vx = vx.Field(i)
|
||||
step.vy = vy.Field(i)
|
||||
step.name = t.Field(i).Name
|
||||
step.idx = i
|
||||
step.unexported = !isExported(step.name)
|
||||
if step.unexported {
|
||||
if step.name == "_" {
|
||||
continue
|
||||
}
|
||||
// Defer checking of unexported fields until later to give an
|
||||
// Ignore a chance to ignore the field.
|
||||
if !vax.IsValid() || !vay.IsValid() {
|
||||
// For retrieveUnexportedField to work, the parent struct must
|
||||
// be addressable. Create a new copy of the values if
|
||||
// necessary to make them addressable.
|
||||
addr = vx.CanAddr() || vy.CanAddr()
|
||||
vax = makeAddressable(vx)
|
||||
vay = makeAddressable(vy)
|
||||
}
|
||||
if !mayForceInit {
|
||||
for _, xf := range s.exporters {
|
||||
mayForce = mayForce || xf(t)
|
||||
}
|
||||
mayForceInit = true
|
||||
}
|
||||
step.mayForce = mayForce
|
||||
step.paddr = addr
|
||||
step.pvx = vax
|
||||
step.pvy = vay
|
||||
step.field = t.Field(i)
|
||||
}
|
||||
s.compareAny(step)
|
||||
}
|
||||
}
|
||||
|
||||
func (s *state) compareSlice(t reflect.Type, vx, vy reflect.Value) {
|
||||
isSlice := t.Kind() == reflect.Slice
|
||||
if isSlice && (vx.IsNil() || vy.IsNil()) {
|
||||
s.report(vx.IsNil() && vy.IsNil(), 0)
|
||||
return
|
||||
}
|
||||
|
||||
// NOTE: It is incorrect to call curPtrs.Push on the slice header pointer
|
||||
// since slices represents a list of pointers, rather than a single pointer.
|
||||
// The pointer checking logic must be handled on a per-element basis
|
||||
// in compareAny.
|
||||
//
|
||||
// A slice header (see reflect.SliceHeader) in Go is a tuple of a starting
|
||||
// pointer P, a length N, and a capacity C. Supposing each slice element has
|
||||
// a memory size of M, then the slice is equivalent to the list of pointers:
|
||||
// [P+i*M for i in range(N)]
|
||||
//
|
||||
// For example, v[:0] and v[:1] are slices with the same starting pointer,
|
||||
// but they are clearly different values. Using the slice pointer alone
|
||||
// violates the assumption that equal pointers implies equal values.
|
||||
|
||||
step := SliceIndex{&sliceIndex{pathStep: pathStep{typ: t.Elem()}, isSlice: isSlice}}
|
||||
withIndexes := func(ix, iy int) SliceIndex {
|
||||
if ix >= 0 {
|
||||
step.vx, step.xkey = vx.Index(ix), ix
|
||||
} else {
|
||||
step.vx, step.xkey = reflect.Value{}, -1
|
||||
}
|
||||
if iy >= 0 {
|
||||
step.vy, step.ykey = vy.Index(iy), iy
|
||||
} else {
|
||||
step.vy, step.ykey = reflect.Value{}, -1
|
||||
}
|
||||
return step
|
||||
}
|
||||
|
||||
// Ignore options are able to ignore missing elements in a slice.
|
||||
// However, detecting these reliably requires an optimal differencing
|
||||
// algorithm, for which diff.Difference is not.
|
||||
//
|
||||
// Instead, we first iterate through both slices to detect which elements
|
||||
// would be ignored if standing alone. The index of non-discarded elements
|
||||
// are stored in a separate slice, which diffing is then performed on.
|
||||
var indexesX, indexesY []int
|
||||
var ignoredX, ignoredY []bool
|
||||
for ix := 0; ix < vx.Len(); ix++ {
|
||||
ignored := s.statelessCompare(withIndexes(ix, -1)).NumDiff == 0
|
||||
if !ignored {
|
||||
indexesX = append(indexesX, ix)
|
||||
}
|
||||
ignoredX = append(ignoredX, ignored)
|
||||
}
|
||||
for iy := 0; iy < vy.Len(); iy++ {
|
||||
ignored := s.statelessCompare(withIndexes(-1, iy)).NumDiff == 0
|
||||
if !ignored {
|
||||
indexesY = append(indexesY, iy)
|
||||
}
|
||||
ignoredY = append(ignoredY, ignored)
|
||||
}
|
||||
|
||||
// Compute an edit-script for slices vx and vy (excluding ignored elements).
|
||||
edits := diff.Difference(len(indexesX), len(indexesY), func(ix, iy int) diff.Result {
|
||||
return s.statelessCompare(withIndexes(indexesX[ix], indexesY[iy]))
|
||||
})
|
||||
|
||||
// Replay the ignore-scripts and the edit-script.
|
||||
var ix, iy int
|
||||
for ix < vx.Len() || iy < vy.Len() {
|
||||
var e diff.EditType
|
||||
switch {
|
||||
case ix < len(ignoredX) && ignoredX[ix]:
|
||||
e = diff.UniqueX
|
||||
case iy < len(ignoredY) && ignoredY[iy]:
|
||||
e = diff.UniqueY
|
||||
default:
|
||||
e, edits = edits[0], edits[1:]
|
||||
}
|
||||
switch e {
|
||||
case diff.UniqueX:
|
||||
s.compareAny(withIndexes(ix, -1))
|
||||
ix++
|
||||
case diff.UniqueY:
|
||||
s.compareAny(withIndexes(-1, iy))
|
||||
iy++
|
||||
default:
|
||||
s.compareAny(withIndexes(ix, iy))
|
||||
ix++
|
||||
iy++
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (s *state) compareMap(t reflect.Type, vx, vy reflect.Value) {
|
||||
if vx.IsNil() || vy.IsNil() {
|
||||
s.report(vx.IsNil() && vy.IsNil(), 0)
|
||||
return
|
||||
}
|
||||
|
||||
// Cycle-detection for maps.
|
||||
if eq, visited := s.curPtrs.Push(vx, vy); visited {
|
||||
s.report(eq, reportByCycle)
|
||||
return
|
||||
}
|
||||
defer s.curPtrs.Pop(vx, vy)
|
||||
|
||||
// We combine and sort the two map keys so that we can perform the
|
||||
// comparisons in a deterministic order.
|
||||
step := MapIndex{&mapIndex{pathStep: pathStep{typ: t.Elem()}}}
|
||||
for _, k := range value.SortKeys(append(vx.MapKeys(), vy.MapKeys()...)) {
|
||||
step.vx = vx.MapIndex(k)
|
||||
step.vy = vy.MapIndex(k)
|
||||
step.key = k
|
||||
if !step.vx.IsValid() && !step.vy.IsValid() {
|
||||
// It is possible for both vx and vy to be invalid if the
|
||||
// key contained a NaN value in it.
|
||||
//
|
||||
// Even with the ability to retrieve NaN keys in Go 1.12,
|
||||
// there still isn't a sensible way to compare the values since
|
||||
// a NaN key may map to multiple unordered values.
|
||||
// The most reasonable way to compare NaNs would be to compare the
|
||||
// set of values. However, this is impossible to do efficiently
|
||||
// since set equality is provably an O(n^2) operation given only
|
||||
// an Equal function. If we had a Less function or Hash function,
|
||||
// this could be done in O(n*log(n)) or O(n), respectively.
|
||||
//
|
||||
// Rather than adding complex logic to deal with NaNs, make it
|
||||
// the user's responsibility to compare such obscure maps.
|
||||
const help = "consider providing a Comparer to compare the map"
|
||||
panic(fmt.Sprintf("%#v has map key with NaNs\n%s", s.curPath, help))
|
||||
}
|
||||
s.compareAny(step)
|
||||
}
|
||||
}
|
||||
|
||||
func (s *state) comparePtr(t reflect.Type, vx, vy reflect.Value) {
|
||||
if vx.IsNil() || vy.IsNil() {
|
||||
s.report(vx.IsNil() && vy.IsNil(), 0)
|
||||
return
|
||||
}
|
||||
|
||||
// Cycle-detection for pointers.
|
||||
if eq, visited := s.curPtrs.Push(vx, vy); visited {
|
||||
s.report(eq, reportByCycle)
|
||||
return
|
||||
}
|
||||
defer s.curPtrs.Pop(vx, vy)
|
||||
|
||||
vx, vy = vx.Elem(), vy.Elem()
|
||||
s.compareAny(Indirect{&indirect{pathStep{t.Elem(), vx, vy}}})
|
||||
}
|
||||
|
||||
func (s *state) compareInterface(t reflect.Type, vx, vy reflect.Value) {
|
||||
if vx.IsNil() || vy.IsNil() {
|
||||
s.report(vx.IsNil() && vy.IsNil(), 0)
|
||||
return
|
||||
}
|
||||
vx, vy = vx.Elem(), vy.Elem()
|
||||
if vx.Type() != vy.Type() {
|
||||
s.report(false, 0)
|
||||
return
|
||||
}
|
||||
s.compareAny(TypeAssertion{&typeAssertion{pathStep{vx.Type(), vx, vy}}})
|
||||
}
|
||||
|
||||
func (s *state) report(eq bool, rf resultFlags) {
|
||||
if rf&reportByIgnore == 0 {
|
||||
if eq {
|
||||
s.result.NumSame++
|
||||
rf |= reportEqual
|
||||
} else {
|
||||
s.result.NumDiff++
|
||||
rf |= reportUnequal
|
||||
}
|
||||
}
|
||||
for _, r := range s.reporters {
|
||||
r.Report(Result{flags: rf})
|
||||
}
|
||||
}
|
||||
|
||||
// recChecker tracks the state needed to periodically perform checks that
|
||||
// user provided transformers are not stuck in an infinitely recursive cycle.
|
||||
type recChecker struct{ next int }
|
||||
|
||||
// Check scans the Path for any recursive transformers and panics when any
|
||||
// recursive transformers are detected. Note that the presence of a
|
||||
// recursive Transformer does not necessarily imply an infinite cycle.
|
||||
// As such, this check only activates after some minimal number of path steps.
|
||||
func (rc *recChecker) Check(p Path) {
|
||||
const minLen = 1 << 16
|
||||
if rc.next == 0 {
|
||||
rc.next = minLen
|
||||
}
|
||||
if len(p) < rc.next {
|
||||
return
|
||||
}
|
||||
rc.next <<= 1
|
||||
|
||||
// Check whether the same transformer has appeared at least twice.
|
||||
var ss []string
|
||||
m := map[Option]int{}
|
||||
for _, ps := range p {
|
||||
if t, ok := ps.(Transform); ok {
|
||||
t := t.Option()
|
||||
if m[t] == 1 { // Transformer was used exactly once before
|
||||
tf := t.(*transformer).fnc.Type()
|
||||
ss = append(ss, fmt.Sprintf("%v: %v => %v", t, tf.In(0), tf.Out(0)))
|
||||
}
|
||||
m[t]++
|
||||
}
|
||||
}
|
||||
if len(ss) > 0 {
|
||||
const warning = "recursive set of Transformers detected"
|
||||
const help = "consider using cmpopts.AcyclicTransformer"
|
||||
set := strings.Join(ss, "\n\t")
|
||||
panic(fmt.Sprintf("%s:\n\t%s\n%s", warning, set, help))
|
||||
}
|
||||
}
|
||||
|
||||
// dynChecker tracks the state needed to periodically perform checks that
|
||||
// user provided functions are symmetric and deterministic.
|
||||
// The zero value is safe for immediate use.
|
||||
type dynChecker struct{ curr, next int }
|
||||
|
||||
// Next increments the state and reports whether a check should be performed.
|
||||
//
|
||||
// Checks occur every Nth function call, where N is a triangular number:
|
||||
//
|
||||
// 0 1 3 6 10 15 21 28 36 45 55 66 78 91 105 120 136 153 171 190 ...
|
||||
//
|
||||
// See https://en.wikipedia.org/wiki/Triangular_number
|
||||
//
|
||||
// This sequence ensures that the cost of checks drops significantly as
|
||||
// the number of functions calls grows larger.
|
||||
func (dc *dynChecker) Next() bool {
|
||||
ok := dc.curr == dc.next
|
||||
if ok {
|
||||
dc.curr = 0
|
||||
dc.next++
|
||||
}
|
||||
dc.curr++
|
||||
return ok
|
||||
}
|
||||
|
||||
// makeAddressable returns a value that is always addressable.
|
||||
// It returns the input verbatim if it is already addressable,
|
||||
// otherwise it creates a new value and returns an addressable copy.
|
||||
func makeAddressable(v reflect.Value) reflect.Value {
|
||||
if v.CanAddr() {
|
||||
return v
|
||||
}
|
||||
vc := reflect.New(v.Type()).Elem()
|
||||
vc.Set(v)
|
||||
return vc
|
||||
}
|
||||
-31
@@ -1,31 +0,0 @@
|
||||
// Copyright 2017, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package cmp
|
||||
|
||||
import (
|
||||
"reflect"
|
||||
"unsafe"
|
||||
)
|
||||
|
||||
// retrieveUnexportedField uses unsafe to forcibly retrieve any field from
|
||||
// a struct such that the value has read-write permissions.
|
||||
//
|
||||
// The parent struct, v, must be addressable, while f must be a StructField
|
||||
// describing the field to retrieve. If addr is false,
|
||||
// then the returned value will be shallowed copied to be non-addressable.
|
||||
func retrieveUnexportedField(v reflect.Value, f reflect.StructField, addr bool) reflect.Value {
|
||||
ve := reflect.NewAt(f.Type, unsafe.Pointer(uintptr(unsafe.Pointer(v.UnsafeAddr()))+f.Offset)).Elem()
|
||||
if !addr {
|
||||
// A field is addressable if and only if the struct is addressable.
|
||||
// If the original parent value was not addressable, shallow copy the
|
||||
// value to make it non-addressable to avoid leaking an implementation
|
||||
// detail of how forcibly exporting a field works.
|
||||
if ve.Kind() == reflect.Interface && ve.IsNil() {
|
||||
return reflect.Zero(f.Type)
|
||||
}
|
||||
return reflect.ValueOf(ve.Interface()).Convert(f.Type)
|
||||
}
|
||||
return ve
|
||||
}
|
||||
-18
@@ -1,18 +0,0 @@
|
||||
// Copyright 2017, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
//go:build !cmp_debug
|
||||
// +build !cmp_debug
|
||||
|
||||
package diff
|
||||
|
||||
var debug debugger
|
||||
|
||||
type debugger struct{}
|
||||
|
||||
func (debugger) Begin(_, _ int, f EqualFunc, _, _ *EditScript) EqualFunc {
|
||||
return f
|
||||
}
|
||||
func (debugger) Update() {}
|
||||
func (debugger) Finish() {}
|
||||
-123
@@ -1,123 +0,0 @@
|
||||
// Copyright 2017, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
//go:build cmp_debug
|
||||
// +build cmp_debug
|
||||
|
||||
package diff
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
)
|
||||
|
||||
// The algorithm can be seen running in real-time by enabling debugging:
|
||||
// go test -tags=cmp_debug -v
|
||||
//
|
||||
// Example output:
|
||||
// === RUN TestDifference/#34
|
||||
// ┌───────────────────────────────┐
|
||||
// │ \ · · · · · · · · · · · · · · │
|
||||
// │ · # · · · · · · · · · · · · · │
|
||||
// │ · \ · · · · · · · · · · · · · │
|
||||
// │ · · \ · · · · · · · · · · · · │
|
||||
// │ · · · X # · · · · · · · · · · │
|
||||
// │ · · · # \ · · · · · · · · · · │
|
||||
// │ · · · · · # # · · · · · · · · │
|
||||
// │ · · · · · # \ · · · · · · · · │
|
||||
// │ · · · · · · · \ · · · · · · · │
|
||||
// │ · · · · · · · · \ · · · · · · │
|
||||
// │ · · · · · · · · · \ · · · · · │
|
||||
// │ · · · · · · · · · · \ · · # · │
|
||||
// │ · · · · · · · · · · · \ # # · │
|
||||
// │ · · · · · · · · · · · # # # · │
|
||||
// │ · · · · · · · · · · # # # # · │
|
||||
// │ · · · · · · · · · # # # # # · │
|
||||
// │ · · · · · · · · · · · · · · \ │
|
||||
// └───────────────────────────────┘
|
||||
// [.Y..M.XY......YXYXY.|]
|
||||
//
|
||||
// The grid represents the edit-graph where the horizontal axis represents
|
||||
// list X and the vertical axis represents list Y. The start of the two lists
|
||||
// is the top-left, while the ends are the bottom-right. The '·' represents
|
||||
// an unexplored node in the graph. The '\' indicates that the two symbols
|
||||
// from list X and Y are equal. The 'X' indicates that two symbols are similar
|
||||
// (but not exactly equal) to each other. The '#' indicates that the two symbols
|
||||
// are different (and not similar). The algorithm traverses this graph trying to
|
||||
// make the paths starting in the top-left and the bottom-right connect.
|
||||
//
|
||||
// The series of '.', 'X', 'Y', and 'M' characters at the bottom represents
|
||||
// the currently established path from the forward and reverse searches,
|
||||
// separated by a '|' character.
|
||||
|
||||
const (
|
||||
updateDelay = 100 * time.Millisecond
|
||||
finishDelay = 500 * time.Millisecond
|
||||
ansiTerminal = true // ANSI escape codes used to move terminal cursor
|
||||
)
|
||||
|
||||
var debug debugger
|
||||
|
||||
type debugger struct {
|
||||
sync.Mutex
|
||||
p1, p2 EditScript
|
||||
fwdPath, revPath *EditScript
|
||||
grid []byte
|
||||
lines int
|
||||
}
|
||||
|
||||
func (dbg *debugger) Begin(nx, ny int, f EqualFunc, p1, p2 *EditScript) EqualFunc {
|
||||
dbg.Lock()
|
||||
dbg.fwdPath, dbg.revPath = p1, p2
|
||||
top := "┌─" + strings.Repeat("──", nx) + "┐\n"
|
||||
row := "│ " + strings.Repeat("· ", nx) + "│\n"
|
||||
btm := "└─" + strings.Repeat("──", nx) + "┘\n"
|
||||
dbg.grid = []byte(top + strings.Repeat(row, ny) + btm)
|
||||
dbg.lines = strings.Count(dbg.String(), "\n")
|
||||
fmt.Print(dbg)
|
||||
|
||||
// Wrap the EqualFunc so that we can intercept each result.
|
||||
return func(ix, iy int) (r Result) {
|
||||
cell := dbg.grid[len(top)+iy*len(row):][len("│ ")+len("· ")*ix:][:len("·")]
|
||||
for i := range cell {
|
||||
cell[i] = 0 // Zero out the multiple bytes of UTF-8 middle-dot
|
||||
}
|
||||
switch r = f(ix, iy); {
|
||||
case r.Equal():
|
||||
cell[0] = '\\'
|
||||
case r.Similar():
|
||||
cell[0] = 'X'
|
||||
default:
|
||||
cell[0] = '#'
|
||||
}
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
func (dbg *debugger) Update() {
|
||||
dbg.print(updateDelay)
|
||||
}
|
||||
|
||||
func (dbg *debugger) Finish() {
|
||||
dbg.print(finishDelay)
|
||||
dbg.Unlock()
|
||||
}
|
||||
|
||||
func (dbg *debugger) String() string {
|
||||
dbg.p1, dbg.p2 = *dbg.fwdPath, dbg.p2[:0]
|
||||
for i := len(*dbg.revPath) - 1; i >= 0; i-- {
|
||||
dbg.p2 = append(dbg.p2, (*dbg.revPath)[i])
|
||||
}
|
||||
return fmt.Sprintf("%s[%v|%v]\n\n", dbg.grid, dbg.p1, dbg.p2)
|
||||
}
|
||||
|
||||
func (dbg *debugger) print(d time.Duration) {
|
||||
if ansiTerminal {
|
||||
fmt.Printf("\x1b[%dA", dbg.lines) // Reset terminal cursor
|
||||
}
|
||||
fmt.Print(dbg)
|
||||
time.Sleep(d)
|
||||
}
|
||||
-402
@@ -1,402 +0,0 @@
|
||||
// Copyright 2017, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Package diff implements an algorithm for producing edit-scripts.
|
||||
// The edit-script is a sequence of operations needed to transform one list
|
||||
// of symbols into another (or vice-versa). The edits allowed are insertions,
|
||||
// deletions, and modifications. The summation of all edits is called the
|
||||
// Levenshtein distance as this problem is well-known in computer science.
|
||||
//
|
||||
// This package prioritizes performance over accuracy. That is, the run time
|
||||
// is more important than obtaining a minimal Levenshtein distance.
|
||||
package diff
|
||||
|
||||
import (
|
||||
"math/rand"
|
||||
"time"
|
||||
|
||||
"github.com/google/go-cmp/cmp/internal/flags"
|
||||
)
|
||||
|
||||
// EditType represents a single operation within an edit-script.
|
||||
type EditType uint8
|
||||
|
||||
const (
|
||||
// Identity indicates that a symbol pair is identical in both list X and Y.
|
||||
Identity EditType = iota
|
||||
// UniqueX indicates that a symbol only exists in X and not Y.
|
||||
UniqueX
|
||||
// UniqueY indicates that a symbol only exists in Y and not X.
|
||||
UniqueY
|
||||
// Modified indicates that a symbol pair is a modification of each other.
|
||||
Modified
|
||||
)
|
||||
|
||||
// EditScript represents the series of differences between two lists.
|
||||
type EditScript []EditType
|
||||
|
||||
// String returns a human-readable string representing the edit-script where
|
||||
// Identity, UniqueX, UniqueY, and Modified are represented by the
|
||||
// '.', 'X', 'Y', and 'M' characters, respectively.
|
||||
func (es EditScript) String() string {
|
||||
b := make([]byte, len(es))
|
||||
for i, e := range es {
|
||||
switch e {
|
||||
case Identity:
|
||||
b[i] = '.'
|
||||
case UniqueX:
|
||||
b[i] = 'X'
|
||||
case UniqueY:
|
||||
b[i] = 'Y'
|
||||
case Modified:
|
||||
b[i] = 'M'
|
||||
default:
|
||||
panic("invalid edit-type")
|
||||
}
|
||||
}
|
||||
return string(b)
|
||||
}
|
||||
|
||||
// stats returns a histogram of the number of each type of edit operation.
|
||||
func (es EditScript) stats() (s struct{ NI, NX, NY, NM int }) {
|
||||
for _, e := range es {
|
||||
switch e {
|
||||
case Identity:
|
||||
s.NI++
|
||||
case UniqueX:
|
||||
s.NX++
|
||||
case UniqueY:
|
||||
s.NY++
|
||||
case Modified:
|
||||
s.NM++
|
||||
default:
|
||||
panic("invalid edit-type")
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// Dist is the Levenshtein distance and is guaranteed to be 0 if and only if
|
||||
// lists X and Y are equal.
|
||||
func (es EditScript) Dist() int { return len(es) - es.stats().NI }
|
||||
|
||||
// LenX is the length of the X list.
|
||||
func (es EditScript) LenX() int { return len(es) - es.stats().NY }
|
||||
|
||||
// LenY is the length of the Y list.
|
||||
func (es EditScript) LenY() int { return len(es) - es.stats().NX }
|
||||
|
||||
// EqualFunc reports whether the symbols at indexes ix and iy are equal.
|
||||
// When called by Difference, the index is guaranteed to be within nx and ny.
|
||||
type EqualFunc func(ix int, iy int) Result
|
||||
|
||||
// Result is the result of comparison.
|
||||
// NumSame is the number of sub-elements that are equal.
|
||||
// NumDiff is the number of sub-elements that are not equal.
|
||||
type Result struct{ NumSame, NumDiff int }
|
||||
|
||||
// BoolResult returns a Result that is either Equal or not Equal.
|
||||
func BoolResult(b bool) Result {
|
||||
if b {
|
||||
return Result{NumSame: 1} // Equal, Similar
|
||||
} else {
|
||||
return Result{NumDiff: 2} // Not Equal, not Similar
|
||||
}
|
||||
}
|
||||
|
||||
// Equal indicates whether the symbols are equal. Two symbols are equal
|
||||
// if and only if NumDiff == 0. If Equal, then they are also Similar.
|
||||
func (r Result) Equal() bool { return r.NumDiff == 0 }
|
||||
|
||||
// Similar indicates whether two symbols are similar and may be represented
|
||||
// by using the Modified type. As a special case, we consider binary comparisons
|
||||
// (i.e., those that return Result{1, 0} or Result{0, 1}) to be similar.
|
||||
//
|
||||
// The exact ratio of NumSame to NumDiff to determine similarity may change.
|
||||
func (r Result) Similar() bool {
|
||||
// Use NumSame+1 to offset NumSame so that binary comparisons are similar.
|
||||
return r.NumSame+1 >= r.NumDiff
|
||||
}
|
||||
|
||||
var randBool = rand.New(rand.NewSource(time.Now().Unix())).Intn(2) == 0
|
||||
|
||||
// Difference reports whether two lists of lengths nx and ny are equal
|
||||
// given the definition of equality provided as f.
|
||||
//
|
||||
// This function returns an edit-script, which is a sequence of operations
|
||||
// needed to convert one list into the other. The following invariants for
|
||||
// the edit-script are maintained:
|
||||
// - eq == (es.Dist()==0)
|
||||
// - nx == es.LenX()
|
||||
// - ny == es.LenY()
|
||||
//
|
||||
// This algorithm is not guaranteed to be an optimal solution (i.e., one that
|
||||
// produces an edit-script with a minimal Levenshtein distance). This algorithm
|
||||
// favors performance over optimality. The exact output is not guaranteed to
|
||||
// be stable and may change over time.
|
||||
func Difference(nx, ny int, f EqualFunc) (es EditScript) {
|
||||
// This algorithm is based on traversing what is known as an "edit-graph".
|
||||
// See Figure 1 from "An O(ND) Difference Algorithm and Its Variations"
|
||||
// by Eugene W. Myers. Since D can be as large as N itself, this is
|
||||
// effectively O(N^2). Unlike the algorithm from that paper, we are not
|
||||
// interested in the optimal path, but at least some "decent" path.
|
||||
//
|
||||
// For example, let X and Y be lists of symbols:
|
||||
// X = [A B C A B B A]
|
||||
// Y = [C B A B A C]
|
||||
//
|
||||
// The edit-graph can be drawn as the following:
|
||||
// A B C A B B A
|
||||
// ┌─────────────┐
|
||||
// C │_|_|\|_|_|_|_│ 0
|
||||
// B │_|\|_|_|\|\|_│ 1
|
||||
// A │\|_|_|\|_|_|\│ 2
|
||||
// B │_|\|_|_|\|\|_│ 3
|
||||
// A │\|_|_|\|_|_|\│ 4
|
||||
// C │ | |\| | | | │ 5
|
||||
// └─────────────┘ 6
|
||||
// 0 1 2 3 4 5 6 7
|
||||
//
|
||||
// List X is written along the horizontal axis, while list Y is written
|
||||
// along the vertical axis. At any point on this grid, if the symbol in
|
||||
// list X matches the corresponding symbol in list Y, then a '\' is drawn.
|
||||
// The goal of any minimal edit-script algorithm is to find a path from the
|
||||
// top-left corner to the bottom-right corner, while traveling through the
|
||||
// fewest horizontal or vertical edges.
|
||||
// A horizontal edge is equivalent to inserting a symbol from list X.
|
||||
// A vertical edge is equivalent to inserting a symbol from list Y.
|
||||
// A diagonal edge is equivalent to a matching symbol between both X and Y.
|
||||
|
||||
// Invariants:
|
||||
// - 0 ≤ fwdPath.X ≤ (fwdFrontier.X, revFrontier.X) ≤ revPath.X ≤ nx
|
||||
// - 0 ≤ fwdPath.Y ≤ (fwdFrontier.Y, revFrontier.Y) ≤ revPath.Y ≤ ny
|
||||
//
|
||||
// In general:
|
||||
// - fwdFrontier.X < revFrontier.X
|
||||
// - fwdFrontier.Y < revFrontier.Y
|
||||
//
|
||||
// Unless, it is time for the algorithm to terminate.
|
||||
fwdPath := path{+1, point{0, 0}, make(EditScript, 0, (nx+ny)/2)}
|
||||
revPath := path{-1, point{nx, ny}, make(EditScript, 0)}
|
||||
fwdFrontier := fwdPath.point // Forward search frontier
|
||||
revFrontier := revPath.point // Reverse search frontier
|
||||
|
||||
// Search budget bounds the cost of searching for better paths.
|
||||
// The longest sequence of non-matching symbols that can be tolerated is
|
||||
// approximately the square-root of the search budget.
|
||||
searchBudget := 4 * (nx + ny) // O(n)
|
||||
|
||||
// Running the tests with the "cmp_debug" build tag prints a visualization
|
||||
// of the algorithm running in real-time. This is educational for
|
||||
// understanding how the algorithm works. See debug_enable.go.
|
||||
f = debug.Begin(nx, ny, f, &fwdPath.es, &revPath.es)
|
||||
|
||||
// The algorithm below is a greedy, meet-in-the-middle algorithm for
|
||||
// computing sub-optimal edit-scripts between two lists.
|
||||
//
|
||||
// The algorithm is approximately as follows:
|
||||
// - Searching for differences switches back-and-forth between
|
||||
// a search that starts at the beginning (the top-left corner), and
|
||||
// a search that starts at the end (the bottom-right corner).
|
||||
// The goal of the search is connect with the search
|
||||
// from the opposite corner.
|
||||
// - As we search, we build a path in a greedy manner,
|
||||
// where the first match seen is added to the path (this is sub-optimal,
|
||||
// but provides a decent result in practice). When matches are found,
|
||||
// we try the next pair of symbols in the lists and follow all matches
|
||||
// as far as possible.
|
||||
// - When searching for matches, we search along a diagonal going through
|
||||
// through the "frontier" point. If no matches are found,
|
||||
// we advance the frontier towards the opposite corner.
|
||||
// - This algorithm terminates when either the X coordinates or the
|
||||
// Y coordinates of the forward and reverse frontier points ever intersect.
|
||||
|
||||
// This algorithm is correct even if searching only in the forward direction
|
||||
// or in the reverse direction. We do both because it is commonly observed
|
||||
// that two lists commonly differ because elements were added to the front
|
||||
// or end of the other list.
|
||||
//
|
||||
// Non-deterministically start with either the forward or reverse direction
|
||||
// to introduce some deliberate instability so that we have the flexibility
|
||||
// to change this algorithm in the future.
|
||||
if flags.Deterministic || randBool {
|
||||
goto forwardSearch
|
||||
} else {
|
||||
goto reverseSearch
|
||||
}
|
||||
|
||||
forwardSearch:
|
||||
{
|
||||
// Forward search from the beginning.
|
||||
if fwdFrontier.X >= revFrontier.X || fwdFrontier.Y >= revFrontier.Y || searchBudget == 0 {
|
||||
goto finishSearch
|
||||
}
|
||||
for stop1, stop2, i := false, false, 0; !(stop1 && stop2) && searchBudget > 0; i++ {
|
||||
// Search in a diagonal pattern for a match.
|
||||
z := zigzag(i)
|
||||
p := point{fwdFrontier.X + z, fwdFrontier.Y - z}
|
||||
switch {
|
||||
case p.X >= revPath.X || p.Y < fwdPath.Y:
|
||||
stop1 = true // Hit top-right corner
|
||||
case p.Y >= revPath.Y || p.X < fwdPath.X:
|
||||
stop2 = true // Hit bottom-left corner
|
||||
case f(p.X, p.Y).Equal():
|
||||
// Match found, so connect the path to this point.
|
||||
fwdPath.connect(p, f)
|
||||
fwdPath.append(Identity)
|
||||
// Follow sequence of matches as far as possible.
|
||||
for fwdPath.X < revPath.X && fwdPath.Y < revPath.Y {
|
||||
if !f(fwdPath.X, fwdPath.Y).Equal() {
|
||||
break
|
||||
}
|
||||
fwdPath.append(Identity)
|
||||
}
|
||||
fwdFrontier = fwdPath.point
|
||||
stop1, stop2 = true, true
|
||||
default:
|
||||
searchBudget-- // Match not found
|
||||
}
|
||||
debug.Update()
|
||||
}
|
||||
// Advance the frontier towards reverse point.
|
||||
if revPath.X-fwdFrontier.X >= revPath.Y-fwdFrontier.Y {
|
||||
fwdFrontier.X++
|
||||
} else {
|
||||
fwdFrontier.Y++
|
||||
}
|
||||
goto reverseSearch
|
||||
}
|
||||
|
||||
reverseSearch:
|
||||
{
|
||||
// Reverse search from the end.
|
||||
if fwdFrontier.X >= revFrontier.X || fwdFrontier.Y >= revFrontier.Y || searchBudget == 0 {
|
||||
goto finishSearch
|
||||
}
|
||||
for stop1, stop2, i := false, false, 0; !(stop1 && stop2) && searchBudget > 0; i++ {
|
||||
// Search in a diagonal pattern for a match.
|
||||
z := zigzag(i)
|
||||
p := point{revFrontier.X - z, revFrontier.Y + z}
|
||||
switch {
|
||||
case fwdPath.X >= p.X || revPath.Y < p.Y:
|
||||
stop1 = true // Hit bottom-left corner
|
||||
case fwdPath.Y >= p.Y || revPath.X < p.X:
|
||||
stop2 = true // Hit top-right corner
|
||||
case f(p.X-1, p.Y-1).Equal():
|
||||
// Match found, so connect the path to this point.
|
||||
revPath.connect(p, f)
|
||||
revPath.append(Identity)
|
||||
// Follow sequence of matches as far as possible.
|
||||
for fwdPath.X < revPath.X && fwdPath.Y < revPath.Y {
|
||||
if !f(revPath.X-1, revPath.Y-1).Equal() {
|
||||
break
|
||||
}
|
||||
revPath.append(Identity)
|
||||
}
|
||||
revFrontier = revPath.point
|
||||
stop1, stop2 = true, true
|
||||
default:
|
||||
searchBudget-- // Match not found
|
||||
}
|
||||
debug.Update()
|
||||
}
|
||||
// Advance the frontier towards forward point.
|
||||
if revFrontier.X-fwdPath.X >= revFrontier.Y-fwdPath.Y {
|
||||
revFrontier.X--
|
||||
} else {
|
||||
revFrontier.Y--
|
||||
}
|
||||
goto forwardSearch
|
||||
}
|
||||
|
||||
finishSearch:
|
||||
// Join the forward and reverse paths and then append the reverse path.
|
||||
fwdPath.connect(revPath.point, f)
|
||||
for i := len(revPath.es) - 1; i >= 0; i-- {
|
||||
t := revPath.es[i]
|
||||
revPath.es = revPath.es[:i]
|
||||
fwdPath.append(t)
|
||||
}
|
||||
debug.Finish()
|
||||
return fwdPath.es
|
||||
}
|
||||
|
||||
type path struct {
|
||||
dir int // +1 if forward, -1 if reverse
|
||||
point // Leading point of the EditScript path
|
||||
es EditScript
|
||||
}
|
||||
|
||||
// connect appends any necessary Identity, Modified, UniqueX, or UniqueY types
|
||||
// to the edit-script to connect p.point to dst.
|
||||
func (p *path) connect(dst point, f EqualFunc) {
|
||||
if p.dir > 0 {
|
||||
// Connect in forward direction.
|
||||
for dst.X > p.X && dst.Y > p.Y {
|
||||
switch r := f(p.X, p.Y); {
|
||||
case r.Equal():
|
||||
p.append(Identity)
|
||||
case r.Similar():
|
||||
p.append(Modified)
|
||||
case dst.X-p.X >= dst.Y-p.Y:
|
||||
p.append(UniqueX)
|
||||
default:
|
||||
p.append(UniqueY)
|
||||
}
|
||||
}
|
||||
for dst.X > p.X {
|
||||
p.append(UniqueX)
|
||||
}
|
||||
for dst.Y > p.Y {
|
||||
p.append(UniqueY)
|
||||
}
|
||||
} else {
|
||||
// Connect in reverse direction.
|
||||
for p.X > dst.X && p.Y > dst.Y {
|
||||
switch r := f(p.X-1, p.Y-1); {
|
||||
case r.Equal():
|
||||
p.append(Identity)
|
||||
case r.Similar():
|
||||
p.append(Modified)
|
||||
case p.Y-dst.Y >= p.X-dst.X:
|
||||
p.append(UniqueY)
|
||||
default:
|
||||
p.append(UniqueX)
|
||||
}
|
||||
}
|
||||
for p.X > dst.X {
|
||||
p.append(UniqueX)
|
||||
}
|
||||
for p.Y > dst.Y {
|
||||
p.append(UniqueY)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (p *path) append(t EditType) {
|
||||
p.es = append(p.es, t)
|
||||
switch t {
|
||||
case Identity, Modified:
|
||||
p.add(p.dir, p.dir)
|
||||
case UniqueX:
|
||||
p.add(p.dir, 0)
|
||||
case UniqueY:
|
||||
p.add(0, p.dir)
|
||||
}
|
||||
debug.Update()
|
||||
}
|
||||
|
||||
type point struct{ X, Y int }
|
||||
|
||||
func (p *point) add(dx, dy int) { p.X += dx; p.Y += dy }
|
||||
|
||||
// zigzag maps a consecutive sequence of integers to a zig-zag sequence.
|
||||
//
|
||||
// [0 1 2 3 4 5 ...] => [0 -1 +1 -2 +2 ...]
|
||||
func zigzag(x int) int {
|
||||
if x&1 != 0 {
|
||||
x = ^x
|
||||
}
|
||||
return x >> 1
|
||||
}
|
||||
-9
@@ -1,9 +0,0 @@
|
||||
// Copyright 2019, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package flags
|
||||
|
||||
// Deterministic controls whether the output of Diff should be deterministic.
|
||||
// This is only used for testing.
|
||||
var Deterministic bool
|
||||
-106
@@ -1,106 +0,0 @@
|
||||
// Copyright 2017, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Package function provides functionality for identifying function types.
|
||||
package function
|
||||
|
||||
import (
|
||||
"reflect"
|
||||
"regexp"
|
||||
"runtime"
|
||||
"strings"
|
||||
)
|
||||
|
||||
type funcType int
|
||||
|
||||
const (
|
||||
_ funcType = iota
|
||||
|
||||
tbFunc // func(T) bool
|
||||
ttbFunc // func(T, T) bool
|
||||
ttiFunc // func(T, T) int
|
||||
trbFunc // func(T, R) bool
|
||||
tibFunc // func(T, I) bool
|
||||
trFunc // func(T) R
|
||||
|
||||
Equal = ttbFunc // func(T, T) bool
|
||||
EqualAssignable = tibFunc // func(T, I) bool; encapsulates func(T, T) bool
|
||||
Transformer = trFunc // func(T) R
|
||||
ValueFilter = ttbFunc // func(T, T) bool
|
||||
Less = ttbFunc // func(T, T) bool
|
||||
Compare = ttiFunc // func(T, T) int
|
||||
ValuePredicate = tbFunc // func(T) bool
|
||||
KeyValuePredicate = trbFunc // func(T, R) bool
|
||||
)
|
||||
|
||||
var boolType = reflect.TypeOf(true)
|
||||
var intType = reflect.TypeOf(0)
|
||||
|
||||
// IsType reports whether the reflect.Type is of the specified function type.
|
||||
func IsType(t reflect.Type, ft funcType) bool {
|
||||
if t == nil || t.Kind() != reflect.Func || t.IsVariadic() {
|
||||
return false
|
||||
}
|
||||
ni, no := t.NumIn(), t.NumOut()
|
||||
switch ft {
|
||||
case tbFunc: // func(T) bool
|
||||
if ni == 1 && no == 1 && t.Out(0) == boolType {
|
||||
return true
|
||||
}
|
||||
case ttbFunc: // func(T, T) bool
|
||||
if ni == 2 && no == 1 && t.In(0) == t.In(1) && t.Out(0) == boolType {
|
||||
return true
|
||||
}
|
||||
case ttiFunc: // func(T, T) int
|
||||
if ni == 2 && no == 1 && t.In(0) == t.In(1) && t.Out(0) == intType {
|
||||
return true
|
||||
}
|
||||
case trbFunc: // func(T, R) bool
|
||||
if ni == 2 && no == 1 && t.Out(0) == boolType {
|
||||
return true
|
||||
}
|
||||
case tibFunc: // func(T, I) bool
|
||||
if ni == 2 && no == 1 && t.In(0).AssignableTo(t.In(1)) && t.Out(0) == boolType {
|
||||
return true
|
||||
}
|
||||
case trFunc: // func(T) R
|
||||
if ni == 1 && no == 1 {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
var lastIdentRx = regexp.MustCompile(`[_\p{L}][_\p{L}\p{N}]*$`)
|
||||
|
||||
// NameOf returns the name of the function value.
|
||||
func NameOf(v reflect.Value) string {
|
||||
fnc := runtime.FuncForPC(v.Pointer())
|
||||
if fnc == nil {
|
||||
return "<unknown>"
|
||||
}
|
||||
fullName := fnc.Name() // e.g., "long/path/name/mypkg.(*MyType).(long/path/name/mypkg.myMethod)-fm"
|
||||
|
||||
// Method closures have a "-fm" suffix.
|
||||
fullName = strings.TrimSuffix(fullName, "-fm")
|
||||
|
||||
var name string
|
||||
for len(fullName) > 0 {
|
||||
inParen := strings.HasSuffix(fullName, ")")
|
||||
fullName = strings.TrimSuffix(fullName, ")")
|
||||
|
||||
s := lastIdentRx.FindString(fullName)
|
||||
if s == "" {
|
||||
break
|
||||
}
|
||||
name = s + "." + name
|
||||
fullName = strings.TrimSuffix(fullName, s)
|
||||
|
||||
if i := strings.LastIndexByte(fullName, '('); inParen && i >= 0 {
|
||||
fullName = fullName[:i]
|
||||
}
|
||||
fullName = strings.TrimSuffix(fullName, ".")
|
||||
}
|
||||
return strings.TrimSuffix(name, ".")
|
||||
}
|
||||
-164
@@ -1,164 +0,0 @@
|
||||
// Copyright 2020, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package value
|
||||
|
||||
import (
|
||||
"reflect"
|
||||
"strconv"
|
||||
)
|
||||
|
||||
var anyType = reflect.TypeOf((*interface{})(nil)).Elem()
|
||||
|
||||
// TypeString is nearly identical to reflect.Type.String,
|
||||
// but has an additional option to specify that full type names be used.
|
||||
func TypeString(t reflect.Type, qualified bool) string {
|
||||
return string(appendTypeName(nil, t, qualified, false))
|
||||
}
|
||||
|
||||
func appendTypeName(b []byte, t reflect.Type, qualified, elideFunc bool) []byte {
|
||||
// BUG: Go reflection provides no way to disambiguate two named types
|
||||
// of the same name and within the same package,
|
||||
// but declared within the namespace of different functions.
|
||||
|
||||
// Use the "any" alias instead of "interface{}" for better readability.
|
||||
if t == anyType {
|
||||
return append(b, "any"...)
|
||||
}
|
||||
|
||||
// Named type.
|
||||
if t.Name() != "" {
|
||||
if qualified && t.PkgPath() != "" {
|
||||
b = append(b, '"')
|
||||
b = append(b, t.PkgPath()...)
|
||||
b = append(b, '"')
|
||||
b = append(b, '.')
|
||||
b = append(b, t.Name()...)
|
||||
} else {
|
||||
b = append(b, t.String()...)
|
||||
}
|
||||
return b
|
||||
}
|
||||
|
||||
// Unnamed type.
|
||||
switch k := t.Kind(); k {
|
||||
case reflect.Bool, reflect.String, reflect.UnsafePointer,
|
||||
reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
|
||||
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr,
|
||||
reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128:
|
||||
b = append(b, k.String()...)
|
||||
case reflect.Chan:
|
||||
if t.ChanDir() == reflect.RecvDir {
|
||||
b = append(b, "<-"...)
|
||||
}
|
||||
b = append(b, "chan"...)
|
||||
if t.ChanDir() == reflect.SendDir {
|
||||
b = append(b, "<-"...)
|
||||
}
|
||||
b = append(b, ' ')
|
||||
b = appendTypeName(b, t.Elem(), qualified, false)
|
||||
case reflect.Func:
|
||||
if !elideFunc {
|
||||
b = append(b, "func"...)
|
||||
}
|
||||
b = append(b, '(')
|
||||
for i := 0; i < t.NumIn(); i++ {
|
||||
if i > 0 {
|
||||
b = append(b, ", "...)
|
||||
}
|
||||
if i == t.NumIn()-1 && t.IsVariadic() {
|
||||
b = append(b, "..."...)
|
||||
b = appendTypeName(b, t.In(i).Elem(), qualified, false)
|
||||
} else {
|
||||
b = appendTypeName(b, t.In(i), qualified, false)
|
||||
}
|
||||
}
|
||||
b = append(b, ')')
|
||||
switch t.NumOut() {
|
||||
case 0:
|
||||
// Do nothing
|
||||
case 1:
|
||||
b = append(b, ' ')
|
||||
b = appendTypeName(b, t.Out(0), qualified, false)
|
||||
default:
|
||||
b = append(b, " ("...)
|
||||
for i := 0; i < t.NumOut(); i++ {
|
||||
if i > 0 {
|
||||
b = append(b, ", "...)
|
||||
}
|
||||
b = appendTypeName(b, t.Out(i), qualified, false)
|
||||
}
|
||||
b = append(b, ')')
|
||||
}
|
||||
case reflect.Struct:
|
||||
b = append(b, "struct{ "...)
|
||||
for i := 0; i < t.NumField(); i++ {
|
||||
if i > 0 {
|
||||
b = append(b, "; "...)
|
||||
}
|
||||
sf := t.Field(i)
|
||||
if !sf.Anonymous {
|
||||
if qualified && sf.PkgPath != "" {
|
||||
b = append(b, '"')
|
||||
b = append(b, sf.PkgPath...)
|
||||
b = append(b, '"')
|
||||
b = append(b, '.')
|
||||
}
|
||||
b = append(b, sf.Name...)
|
||||
b = append(b, ' ')
|
||||
}
|
||||
b = appendTypeName(b, sf.Type, qualified, false)
|
||||
if sf.Tag != "" {
|
||||
b = append(b, ' ')
|
||||
b = strconv.AppendQuote(b, string(sf.Tag))
|
||||
}
|
||||
}
|
||||
if b[len(b)-1] == ' ' {
|
||||
b = b[:len(b)-1]
|
||||
} else {
|
||||
b = append(b, ' ')
|
||||
}
|
||||
b = append(b, '}')
|
||||
case reflect.Slice, reflect.Array:
|
||||
b = append(b, '[')
|
||||
if k == reflect.Array {
|
||||
b = strconv.AppendUint(b, uint64(t.Len()), 10)
|
||||
}
|
||||
b = append(b, ']')
|
||||
b = appendTypeName(b, t.Elem(), qualified, false)
|
||||
case reflect.Map:
|
||||
b = append(b, "map["...)
|
||||
b = appendTypeName(b, t.Key(), qualified, false)
|
||||
b = append(b, ']')
|
||||
b = appendTypeName(b, t.Elem(), qualified, false)
|
||||
case reflect.Ptr:
|
||||
b = append(b, '*')
|
||||
b = appendTypeName(b, t.Elem(), qualified, false)
|
||||
case reflect.Interface:
|
||||
b = append(b, "interface{ "...)
|
||||
for i := 0; i < t.NumMethod(); i++ {
|
||||
if i > 0 {
|
||||
b = append(b, "; "...)
|
||||
}
|
||||
m := t.Method(i)
|
||||
if qualified && m.PkgPath != "" {
|
||||
b = append(b, '"')
|
||||
b = append(b, m.PkgPath...)
|
||||
b = append(b, '"')
|
||||
b = append(b, '.')
|
||||
}
|
||||
b = append(b, m.Name...)
|
||||
b = appendTypeName(b, m.Type, qualified, true)
|
||||
}
|
||||
if b[len(b)-1] == ' ' {
|
||||
b = b[:len(b)-1]
|
||||
} else {
|
||||
b = append(b, ' ')
|
||||
}
|
||||
b = append(b, '}')
|
||||
default:
|
||||
panic("invalid kind: " + k.String())
|
||||
}
|
||||
return b
|
||||
}
|
||||
-34
@@ -1,34 +0,0 @@
|
||||
// Copyright 2018, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package value
|
||||
|
||||
import (
|
||||
"reflect"
|
||||
"unsafe"
|
||||
)
|
||||
|
||||
// Pointer is an opaque typed pointer and is guaranteed to be comparable.
|
||||
type Pointer struct {
|
||||
p unsafe.Pointer
|
||||
t reflect.Type
|
||||
}
|
||||
|
||||
// PointerOf returns a Pointer from v, which must be a
|
||||
// reflect.Ptr, reflect.Slice, or reflect.Map.
|
||||
func PointerOf(v reflect.Value) Pointer {
|
||||
// The proper representation of a pointer is unsafe.Pointer,
|
||||
// which is necessary if the GC ever uses a moving collector.
|
||||
return Pointer{unsafe.Pointer(v.Pointer()), v.Type()}
|
||||
}
|
||||
|
||||
// IsNil reports whether the pointer is nil.
|
||||
func (p Pointer) IsNil() bool {
|
||||
return p.p == nil
|
||||
}
|
||||
|
||||
// Uintptr returns the pointer as a uintptr.
|
||||
func (p Pointer) Uintptr() uintptr {
|
||||
return uintptr(p.p)
|
||||
}
|
||||
-106
@@ -1,106 +0,0 @@
|
||||
// Copyright 2017, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package value
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"math"
|
||||
"reflect"
|
||||
"sort"
|
||||
)
|
||||
|
||||
// SortKeys sorts a list of map keys, deduplicating keys if necessary.
|
||||
// The type of each value must be comparable.
|
||||
func SortKeys(vs []reflect.Value) []reflect.Value {
|
||||
if len(vs) == 0 {
|
||||
return vs
|
||||
}
|
||||
|
||||
// Sort the map keys.
|
||||
sort.SliceStable(vs, func(i, j int) bool { return isLess(vs[i], vs[j]) })
|
||||
|
||||
// Deduplicate keys (fails for NaNs).
|
||||
vs2 := vs[:1]
|
||||
for _, v := range vs[1:] {
|
||||
if isLess(vs2[len(vs2)-1], v) {
|
||||
vs2 = append(vs2, v)
|
||||
}
|
||||
}
|
||||
return vs2
|
||||
}
|
||||
|
||||
// isLess is a generic function for sorting arbitrary map keys.
|
||||
// The inputs must be of the same type and must be comparable.
|
||||
func isLess(x, y reflect.Value) bool {
|
||||
switch x.Type().Kind() {
|
||||
case reflect.Bool:
|
||||
return !x.Bool() && y.Bool()
|
||||
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
||||
return x.Int() < y.Int()
|
||||
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
||||
return x.Uint() < y.Uint()
|
||||
case reflect.Float32, reflect.Float64:
|
||||
// NOTE: This does not sort -0 as less than +0
|
||||
// since Go maps treat -0 and +0 as equal keys.
|
||||
fx, fy := x.Float(), y.Float()
|
||||
return fx < fy || math.IsNaN(fx) && !math.IsNaN(fy)
|
||||
case reflect.Complex64, reflect.Complex128:
|
||||
cx, cy := x.Complex(), y.Complex()
|
||||
rx, ix, ry, iy := real(cx), imag(cx), real(cy), imag(cy)
|
||||
if rx == ry || (math.IsNaN(rx) && math.IsNaN(ry)) {
|
||||
return ix < iy || math.IsNaN(ix) && !math.IsNaN(iy)
|
||||
}
|
||||
return rx < ry || math.IsNaN(rx) && !math.IsNaN(ry)
|
||||
case reflect.Ptr, reflect.UnsafePointer, reflect.Chan:
|
||||
return x.Pointer() < y.Pointer()
|
||||
case reflect.String:
|
||||
return x.String() < y.String()
|
||||
case reflect.Array:
|
||||
for i := 0; i < x.Len(); i++ {
|
||||
if isLess(x.Index(i), y.Index(i)) {
|
||||
return true
|
||||
}
|
||||
if isLess(y.Index(i), x.Index(i)) {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return false
|
||||
case reflect.Struct:
|
||||
for i := 0; i < x.NumField(); i++ {
|
||||
if isLess(x.Field(i), y.Field(i)) {
|
||||
return true
|
||||
}
|
||||
if isLess(y.Field(i), x.Field(i)) {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return false
|
||||
case reflect.Interface:
|
||||
vx, vy := x.Elem(), y.Elem()
|
||||
if !vx.IsValid() || !vy.IsValid() {
|
||||
return !vx.IsValid() && vy.IsValid()
|
||||
}
|
||||
tx, ty := vx.Type(), vy.Type()
|
||||
if tx == ty {
|
||||
return isLess(x.Elem(), y.Elem())
|
||||
}
|
||||
if tx.Kind() != ty.Kind() {
|
||||
return vx.Kind() < vy.Kind()
|
||||
}
|
||||
if tx.String() != ty.String() {
|
||||
return tx.String() < ty.String()
|
||||
}
|
||||
if tx.PkgPath() != ty.PkgPath() {
|
||||
return tx.PkgPath() < ty.PkgPath()
|
||||
}
|
||||
// This can happen in rare situations, so we fallback to just comparing
|
||||
// the unique pointer for a reflect.Type. This guarantees deterministic
|
||||
// ordering within a program, but it is obviously not stable.
|
||||
return reflect.ValueOf(vx.Type()).Pointer() < reflect.ValueOf(vy.Type()).Pointer()
|
||||
default:
|
||||
// Must be Func, Map, or Slice; which are not comparable.
|
||||
panic(fmt.Sprintf("%T is not comparable", x.Type()))
|
||||
}
|
||||
}
|
||||
-562
@@ -1,562 +0,0 @@
|
||||
// Copyright 2017, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package cmp
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"reflect"
|
||||
"regexp"
|
||||
"strings"
|
||||
|
||||
"github.com/google/go-cmp/cmp/internal/function"
|
||||
)
|
||||
|
||||
// Option configures for specific behavior of [Equal] and [Diff]. In particular,
|
||||
// the fundamental Option functions ([Ignore], [Transformer], and [Comparer]),
|
||||
// configure how equality is determined.
|
||||
//
|
||||
// The fundamental options may be composed with filters ([FilterPath] and
|
||||
// [FilterValues]) to control the scope over which they are applied.
|
||||
//
|
||||
// The [github.com/google/go-cmp/cmp/cmpopts] package provides helper functions
|
||||
// for creating options that may be used with [Equal] and [Diff].
|
||||
type Option interface {
|
||||
// filter applies all filters and returns the option that remains.
|
||||
// Each option may only read s.curPath and call s.callTTBFunc.
|
||||
//
|
||||
// An Options is returned only if multiple comparers or transformers
|
||||
// can apply simultaneously and will only contain values of those types
|
||||
// or sub-Options containing values of those types.
|
||||
filter(s *state, t reflect.Type, vx, vy reflect.Value) applicableOption
|
||||
}
|
||||
|
||||
// applicableOption represents the following types:
|
||||
//
|
||||
// Fundamental: ignore | validator | *comparer | *transformer
|
||||
// Grouping: Options
|
||||
type applicableOption interface {
|
||||
Option
|
||||
|
||||
// apply executes the option, which may mutate s or panic.
|
||||
apply(s *state, vx, vy reflect.Value)
|
||||
}
|
||||
|
||||
// coreOption represents the following types:
|
||||
//
|
||||
// Fundamental: ignore | validator | *comparer | *transformer
|
||||
// Filters: *pathFilter | *valuesFilter
|
||||
type coreOption interface {
|
||||
Option
|
||||
isCore()
|
||||
}
|
||||
|
||||
type core struct{}
|
||||
|
||||
func (core) isCore() {}
|
||||
|
||||
// Options is a list of [Option] values that also satisfies the [Option] interface.
|
||||
// Helper comparison packages may return an Options value when packing multiple
|
||||
// [Option] values into a single [Option]. When this package processes an Options,
|
||||
// it will be implicitly expanded into a flat list.
|
||||
//
|
||||
// Applying a filter on an Options is equivalent to applying that same filter
|
||||
// on all individual options held within.
|
||||
type Options []Option
|
||||
|
||||
func (opts Options) filter(s *state, t reflect.Type, vx, vy reflect.Value) (out applicableOption) {
|
||||
for _, opt := range opts {
|
||||
switch opt := opt.filter(s, t, vx, vy); opt.(type) {
|
||||
case ignore:
|
||||
return ignore{} // Only ignore can short-circuit evaluation
|
||||
case validator:
|
||||
out = validator{} // Takes precedence over comparer or transformer
|
||||
case *comparer, *transformer, Options:
|
||||
switch out.(type) {
|
||||
case nil:
|
||||
out = opt
|
||||
case validator:
|
||||
// Keep validator
|
||||
case *comparer, *transformer, Options:
|
||||
out = Options{out, opt} // Conflicting comparers or transformers
|
||||
}
|
||||
}
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
func (opts Options) apply(s *state, _, _ reflect.Value) {
|
||||
const warning = "ambiguous set of applicable options"
|
||||
const help = "consider using filters to ensure at most one Comparer or Transformer may apply"
|
||||
var ss []string
|
||||
for _, opt := range flattenOptions(nil, opts) {
|
||||
ss = append(ss, fmt.Sprint(opt))
|
||||
}
|
||||
set := strings.Join(ss, "\n\t")
|
||||
panic(fmt.Sprintf("%s at %#v:\n\t%s\n%s", warning, s.curPath, set, help))
|
||||
}
|
||||
|
||||
func (opts Options) String() string {
|
||||
var ss []string
|
||||
for _, opt := range opts {
|
||||
ss = append(ss, fmt.Sprint(opt))
|
||||
}
|
||||
return fmt.Sprintf("Options{%s}", strings.Join(ss, ", "))
|
||||
}
|
||||
|
||||
// FilterPath returns a new [Option] where opt is only evaluated if filter f
|
||||
// returns true for the current [Path] in the value tree.
|
||||
//
|
||||
// This filter is called even if a slice element or map entry is missing and
|
||||
// provides an opportunity to ignore such cases. The filter function must be
|
||||
// symmetric such that the filter result is identical regardless of whether the
|
||||
// missing value is from x or y.
|
||||
//
|
||||
// The option passed in may be an [Ignore], [Transformer], [Comparer], [Options], or
|
||||
// a previously filtered [Option].
|
||||
func FilterPath(f func(Path) bool, opt Option) Option {
|
||||
if f == nil {
|
||||
panic("invalid path filter function")
|
||||
}
|
||||
if opt := normalizeOption(opt); opt != nil {
|
||||
return &pathFilter{fnc: f, opt: opt}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
type pathFilter struct {
|
||||
core
|
||||
fnc func(Path) bool
|
||||
opt Option
|
||||
}
|
||||
|
||||
func (f pathFilter) filter(s *state, t reflect.Type, vx, vy reflect.Value) applicableOption {
|
||||
if f.fnc(s.curPath) {
|
||||
return f.opt.filter(s, t, vx, vy)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (f pathFilter) String() string {
|
||||
return fmt.Sprintf("FilterPath(%s, %v)", function.NameOf(reflect.ValueOf(f.fnc)), f.opt)
|
||||
}
|
||||
|
||||
// FilterValues returns a new [Option] where opt is only evaluated if filter f,
|
||||
// which is a function of the form "func(T, T) bool", returns true for the
|
||||
// current pair of values being compared. If either value is invalid or
|
||||
// the type of the values is not assignable to T, then this filter implicitly
|
||||
// returns false.
|
||||
//
|
||||
// The filter function must be
|
||||
// symmetric (i.e., agnostic to the order of the inputs) and
|
||||
// deterministic (i.e., produces the same result when given the same inputs).
|
||||
// If T is an interface, it is possible that f is called with two values with
|
||||
// different concrete types that both implement T.
|
||||
//
|
||||
// The option passed in may be an [Ignore], [Transformer], [Comparer], [Options], or
|
||||
// a previously filtered [Option].
|
||||
func FilterValues(f interface{}, opt Option) Option {
|
||||
v := reflect.ValueOf(f)
|
||||
if !function.IsType(v.Type(), function.ValueFilter) || v.IsNil() {
|
||||
panic(fmt.Sprintf("invalid values filter function: %T", f))
|
||||
}
|
||||
if opt := normalizeOption(opt); opt != nil {
|
||||
vf := &valuesFilter{fnc: v, opt: opt}
|
||||
if ti := v.Type().In(0); ti.Kind() != reflect.Interface || ti.NumMethod() > 0 {
|
||||
vf.typ = ti
|
||||
}
|
||||
return vf
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
type valuesFilter struct {
|
||||
core
|
||||
typ reflect.Type // T
|
||||
fnc reflect.Value // func(T, T) bool
|
||||
opt Option
|
||||
}
|
||||
|
||||
func (f valuesFilter) filter(s *state, t reflect.Type, vx, vy reflect.Value) applicableOption {
|
||||
if !vx.IsValid() || !vx.CanInterface() || !vy.IsValid() || !vy.CanInterface() {
|
||||
return nil
|
||||
}
|
||||
if (f.typ == nil || t.AssignableTo(f.typ)) && s.callTTBFunc(f.fnc, vx, vy) {
|
||||
return f.opt.filter(s, t, vx, vy)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (f valuesFilter) String() string {
|
||||
return fmt.Sprintf("FilterValues(%s, %v)", function.NameOf(f.fnc), f.opt)
|
||||
}
|
||||
|
||||
// Ignore is an [Option] that causes all comparisons to be ignored.
|
||||
// This value is intended to be combined with [FilterPath] or [FilterValues].
|
||||
// It is an error to pass an unfiltered Ignore option to [Equal].
|
||||
func Ignore() Option { return ignore{} }
|
||||
|
||||
type ignore struct{ core }
|
||||
|
||||
func (ignore) isFiltered() bool { return false }
|
||||
func (ignore) filter(_ *state, _ reflect.Type, _, _ reflect.Value) applicableOption { return ignore{} }
|
||||
func (ignore) apply(s *state, _, _ reflect.Value) { s.report(true, reportByIgnore) }
|
||||
func (ignore) String() string { return "Ignore()" }
|
||||
|
||||
// validator is a sentinel Option type to indicate that some options could not
|
||||
// be evaluated due to unexported fields, missing slice elements, or
|
||||
// missing map entries. Both values are validator only for unexported fields.
|
||||
type validator struct{ core }
|
||||
|
||||
func (validator) filter(_ *state, _ reflect.Type, vx, vy reflect.Value) applicableOption {
|
||||
if !vx.IsValid() || !vy.IsValid() {
|
||||
return validator{}
|
||||
}
|
||||
if !vx.CanInterface() || !vy.CanInterface() {
|
||||
return validator{}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
func (validator) apply(s *state, vx, vy reflect.Value) {
|
||||
// Implies missing slice element or map entry.
|
||||
if !vx.IsValid() || !vy.IsValid() {
|
||||
s.report(vx.IsValid() == vy.IsValid(), 0)
|
||||
return
|
||||
}
|
||||
|
||||
// Unable to Interface implies unexported field without visibility access.
|
||||
if !vx.CanInterface() || !vy.CanInterface() {
|
||||
help := "consider using a custom Comparer; if you control the implementation of type, you can also consider using an Exporter, AllowUnexported, or cmpopts.IgnoreUnexported"
|
||||
var name string
|
||||
if t := s.curPath.Index(-2).Type(); t.Name() != "" {
|
||||
// Named type with unexported fields.
|
||||
name = fmt.Sprintf("%q.%v", t.PkgPath(), t.Name()) // e.g., "path/to/package".MyType
|
||||
isProtoMessage := func(t reflect.Type) bool {
|
||||
m, ok := reflect.PointerTo(t).MethodByName("ProtoReflect")
|
||||
return ok && m.Type.NumIn() == 1 && m.Type.NumOut() == 1 &&
|
||||
m.Type.Out(0).PkgPath() == "google.golang.org/protobuf/reflect/protoreflect" &&
|
||||
m.Type.Out(0).Name() == "Message"
|
||||
}
|
||||
if isProtoMessage(t) {
|
||||
help = `consider using "google.golang.org/protobuf/testing/protocmp".Transform to compare proto.Message types`
|
||||
} else if _, ok := reflect.New(t).Interface().(error); ok {
|
||||
help = "consider using cmpopts.EquateErrors to compare error values"
|
||||
} else if t.Comparable() {
|
||||
help = "consider using cmpopts.EquateComparable to compare comparable Go types"
|
||||
}
|
||||
} else {
|
||||
// Unnamed type with unexported fields. Derive PkgPath from field.
|
||||
var pkgPath string
|
||||
for i := 0; i < t.NumField() && pkgPath == ""; i++ {
|
||||
pkgPath = t.Field(i).PkgPath
|
||||
}
|
||||
name = fmt.Sprintf("%q.(%v)", pkgPath, t.String()) // e.g., "path/to/package".(struct { a int })
|
||||
}
|
||||
panic(fmt.Sprintf("cannot handle unexported field at %#v:\n\t%v\n%s", s.curPath, name, help))
|
||||
}
|
||||
|
||||
panic("not reachable")
|
||||
}
|
||||
|
||||
// identRx represents a valid identifier according to the Go specification.
|
||||
const identRx = `[_\p{L}][_\p{L}\p{N}]*`
|
||||
|
||||
var identsRx = regexp.MustCompile(`^` + identRx + `(\.` + identRx + `)*$`)
|
||||
|
||||
// Transformer returns an [Option] that applies a transformation function that
|
||||
// converts values of a certain type into that of another.
|
||||
//
|
||||
// The transformer f must be a function "func(T) R" that converts values of
|
||||
// type T to those of type R and is implicitly filtered to input values
|
||||
// assignable to T. The transformer must not mutate T in any way.
|
||||
//
|
||||
// To help prevent some cases of infinite recursive cycles applying the
|
||||
// same transform to the output of itself (e.g., in the case where the
|
||||
// input and output types are the same), an implicit filter is added such that
|
||||
// a transformer is applicable only if that exact transformer is not already
|
||||
// in the tail of the [Path] since the last non-[Transform] step.
|
||||
// For situations where the implicit filter is still insufficient,
|
||||
// consider using [github.com/google/go-cmp/cmp/cmpopts.AcyclicTransformer],
|
||||
// which adds a filter to prevent the transformer from
|
||||
// being recursively applied upon itself.
|
||||
//
|
||||
// The name is a user provided label that is used as the [Transform.Name] in the
|
||||
// transformation [PathStep] (and eventually shown in the [Diff] output).
|
||||
// The name must be a valid identifier or qualified identifier in Go syntax.
|
||||
// If empty, an arbitrary name is used.
|
||||
func Transformer(name string, f interface{}) Option {
|
||||
v := reflect.ValueOf(f)
|
||||
if !function.IsType(v.Type(), function.Transformer) || v.IsNil() {
|
||||
panic(fmt.Sprintf("invalid transformer function: %T", f))
|
||||
}
|
||||
if name == "" {
|
||||
name = function.NameOf(v)
|
||||
if !identsRx.MatchString(name) {
|
||||
name = "λ" // Lambda-symbol as placeholder name
|
||||
}
|
||||
} else if !identsRx.MatchString(name) {
|
||||
panic(fmt.Sprintf("invalid name: %q", name))
|
||||
}
|
||||
tr := &transformer{name: name, fnc: reflect.ValueOf(f)}
|
||||
if ti := v.Type().In(0); ti.Kind() != reflect.Interface || ti.NumMethod() > 0 {
|
||||
tr.typ = ti
|
||||
}
|
||||
return tr
|
||||
}
|
||||
|
||||
type transformer struct {
|
||||
core
|
||||
name string
|
||||
typ reflect.Type // T
|
||||
fnc reflect.Value // func(T) R
|
||||
}
|
||||
|
||||
func (tr *transformer) isFiltered() bool { return tr.typ != nil }
|
||||
|
||||
func (tr *transformer) filter(s *state, t reflect.Type, _, _ reflect.Value) applicableOption {
|
||||
for i := len(s.curPath) - 1; i >= 0; i-- {
|
||||
if t, ok := s.curPath[i].(Transform); !ok {
|
||||
break // Hit most recent non-Transform step
|
||||
} else if tr == t.trans {
|
||||
return nil // Cannot directly use same Transform
|
||||
}
|
||||
}
|
||||
if tr.typ == nil || t.AssignableTo(tr.typ) {
|
||||
return tr
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (tr *transformer) apply(s *state, vx, vy reflect.Value) {
|
||||
step := Transform{&transform{pathStep{typ: tr.fnc.Type().Out(0)}, tr}}
|
||||
vvx := s.callTRFunc(tr.fnc, vx, step)
|
||||
vvy := s.callTRFunc(tr.fnc, vy, step)
|
||||
step.vx, step.vy = vvx, vvy
|
||||
s.compareAny(step)
|
||||
}
|
||||
|
||||
func (tr transformer) String() string {
|
||||
return fmt.Sprintf("Transformer(%s, %s)", tr.name, function.NameOf(tr.fnc))
|
||||
}
|
||||
|
||||
// Comparer returns an [Option] that determines whether two values are equal
|
||||
// to each other.
|
||||
//
|
||||
// The comparer f must be a function "func(T, T) bool" and is implicitly
|
||||
// filtered to input values assignable to T. If T is an interface, it is
|
||||
// possible that f is called with two values of different concrete types that
|
||||
// both implement T.
|
||||
//
|
||||
// The equality function must be:
|
||||
// - Symmetric: equal(x, y) == equal(y, x)
|
||||
// - Deterministic: equal(x, y) == equal(x, y)
|
||||
// - Pure: equal(x, y) does not modify x or y
|
||||
func Comparer(f interface{}) Option {
|
||||
v := reflect.ValueOf(f)
|
||||
if !function.IsType(v.Type(), function.Equal) || v.IsNil() {
|
||||
panic(fmt.Sprintf("invalid comparer function: %T", f))
|
||||
}
|
||||
cm := &comparer{fnc: v}
|
||||
if ti := v.Type().In(0); ti.Kind() != reflect.Interface || ti.NumMethod() > 0 {
|
||||
cm.typ = ti
|
||||
}
|
||||
return cm
|
||||
}
|
||||
|
||||
type comparer struct {
|
||||
core
|
||||
typ reflect.Type // T
|
||||
fnc reflect.Value // func(T, T) bool
|
||||
}
|
||||
|
||||
func (cm *comparer) isFiltered() bool { return cm.typ != nil }
|
||||
|
||||
func (cm *comparer) filter(_ *state, t reflect.Type, _, _ reflect.Value) applicableOption {
|
||||
if cm.typ == nil || t.AssignableTo(cm.typ) {
|
||||
return cm
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (cm *comparer) apply(s *state, vx, vy reflect.Value) {
|
||||
eq := s.callTTBFunc(cm.fnc, vx, vy)
|
||||
s.report(eq, reportByFunc)
|
||||
}
|
||||
|
||||
func (cm comparer) String() string {
|
||||
return fmt.Sprintf("Comparer(%s)", function.NameOf(cm.fnc))
|
||||
}
|
||||
|
||||
// Exporter returns an [Option] that specifies whether [Equal] is allowed to
|
||||
// introspect into the unexported fields of certain struct types.
|
||||
//
|
||||
// Users of this option must understand that comparing on unexported fields
|
||||
// from external packages is not safe since changes in the internal
|
||||
// implementation of some external package may cause the result of [Equal]
|
||||
// to unexpectedly change. However, it may be valid to use this option on types
|
||||
// defined in an internal package where the semantic meaning of an unexported
|
||||
// field is in the control of the user.
|
||||
//
|
||||
// In many cases, a custom [Comparer] should be used instead that defines
|
||||
// equality as a function of the public API of a type rather than the underlying
|
||||
// unexported implementation.
|
||||
//
|
||||
// For example, the [reflect.Type] documentation defines equality to be determined
|
||||
// by the == operator on the interface (essentially performing a shallow pointer
|
||||
// comparison) and most attempts to compare *[regexp.Regexp] types are interested
|
||||
// in only checking that the regular expression strings are equal.
|
||||
// Both of these are accomplished using [Comparer] options:
|
||||
//
|
||||
// Comparer(func(x, y reflect.Type) bool { return x == y })
|
||||
// Comparer(func(x, y *regexp.Regexp) bool { return x.String() == y.String() })
|
||||
//
|
||||
// In other cases, the [github.com/google/go-cmp/cmp/cmpopts.IgnoreUnexported]
|
||||
// option can be used to ignore all unexported fields on specified struct types.
|
||||
func Exporter(f func(reflect.Type) bool) Option {
|
||||
return exporter(f)
|
||||
}
|
||||
|
||||
type exporter func(reflect.Type) bool
|
||||
|
||||
func (exporter) filter(_ *state, _ reflect.Type, _, _ reflect.Value) applicableOption {
|
||||
panic("not implemented")
|
||||
}
|
||||
|
||||
// AllowUnexported returns an [Option] that allows [Equal] to forcibly introspect
|
||||
// unexported fields of the specified struct types.
|
||||
//
|
||||
// See [Exporter] for the proper use of this option.
|
||||
func AllowUnexported(types ...interface{}) Option {
|
||||
m := make(map[reflect.Type]bool)
|
||||
for _, typ := range types {
|
||||
t := reflect.TypeOf(typ)
|
||||
if t.Kind() != reflect.Struct {
|
||||
panic(fmt.Sprintf("invalid struct type: %T", typ))
|
||||
}
|
||||
m[t] = true
|
||||
}
|
||||
return exporter(func(t reflect.Type) bool { return m[t] })
|
||||
}
|
||||
|
||||
// Result represents the comparison result for a single node and
|
||||
// is provided by cmp when calling Report (see [Reporter]).
|
||||
type Result struct {
|
||||
_ [0]func() // Make Result incomparable
|
||||
flags resultFlags
|
||||
}
|
||||
|
||||
// Equal reports whether the node was determined to be equal or not.
|
||||
// As a special case, ignored nodes are considered equal.
|
||||
func (r Result) Equal() bool {
|
||||
return r.flags&(reportEqual|reportByIgnore) != 0
|
||||
}
|
||||
|
||||
// ByIgnore reports whether the node is equal because it was ignored.
|
||||
// This never reports true if [Result.Equal] reports false.
|
||||
func (r Result) ByIgnore() bool {
|
||||
return r.flags&reportByIgnore != 0
|
||||
}
|
||||
|
||||
// ByMethod reports whether the Equal method determined equality.
|
||||
func (r Result) ByMethod() bool {
|
||||
return r.flags&reportByMethod != 0
|
||||
}
|
||||
|
||||
// ByFunc reports whether a [Comparer] function determined equality.
|
||||
func (r Result) ByFunc() bool {
|
||||
return r.flags&reportByFunc != 0
|
||||
}
|
||||
|
||||
// ByCycle reports whether a reference cycle was detected.
|
||||
func (r Result) ByCycle() bool {
|
||||
return r.flags&reportByCycle != 0
|
||||
}
|
||||
|
||||
type resultFlags uint
|
||||
|
||||
const (
|
||||
_ resultFlags = (1 << iota) / 2
|
||||
|
||||
reportEqual
|
||||
reportUnequal
|
||||
reportByIgnore
|
||||
reportByMethod
|
||||
reportByFunc
|
||||
reportByCycle
|
||||
)
|
||||
|
||||
// Reporter is an [Option] that can be passed to [Equal]. When [Equal] traverses
|
||||
// the value trees, it calls PushStep as it descends into each node in the
|
||||
// tree and PopStep as it ascend out of the node. The leaves of the tree are
|
||||
// either compared (determined to be equal or not equal) or ignored and reported
|
||||
// as such by calling the Report method.
|
||||
func Reporter(r interface {
|
||||
// PushStep is called when a tree-traversal operation is performed.
|
||||
// The PathStep itself is only valid until the step is popped.
|
||||
// The PathStep.Values are valid for the duration of the entire traversal
|
||||
// and must not be mutated.
|
||||
//
|
||||
// Equal always calls PushStep at the start to provide an operation-less
|
||||
// PathStep used to report the root values.
|
||||
//
|
||||
// Within a slice, the exact set of inserted, removed, or modified elements
|
||||
// is unspecified and may change in future implementations.
|
||||
// The entries of a map are iterated through in an unspecified order.
|
||||
PushStep(PathStep)
|
||||
|
||||
// Report is called exactly once on leaf nodes to report whether the
|
||||
// comparison identified the node as equal, unequal, or ignored.
|
||||
// A leaf node is one that is immediately preceded by and followed by
|
||||
// a pair of PushStep and PopStep calls.
|
||||
Report(Result)
|
||||
|
||||
// PopStep ascends back up the value tree.
|
||||
// There is always a matching pop call for every push call.
|
||||
PopStep()
|
||||
}) Option {
|
||||
return reporter{r}
|
||||
}
|
||||
|
||||
type reporter struct{ reporterIface }
|
||||
type reporterIface interface {
|
||||
PushStep(PathStep)
|
||||
Report(Result)
|
||||
PopStep()
|
||||
}
|
||||
|
||||
func (reporter) filter(_ *state, _ reflect.Type, _, _ reflect.Value) applicableOption {
|
||||
panic("not implemented")
|
||||
}
|
||||
|
||||
// normalizeOption normalizes the input options such that all Options groups
|
||||
// are flattened and groups with a single element are reduced to that element.
|
||||
// Only coreOptions and Options containing coreOptions are allowed.
|
||||
func normalizeOption(src Option) Option {
|
||||
switch opts := flattenOptions(nil, Options{src}); len(opts) {
|
||||
case 0:
|
||||
return nil
|
||||
case 1:
|
||||
return opts[0]
|
||||
default:
|
||||
return opts
|
||||
}
|
||||
}
|
||||
|
||||
// flattenOptions copies all options in src to dst as a flat list.
|
||||
// Only coreOptions and Options containing coreOptions are allowed.
|
||||
func flattenOptions(dst, src Options) Options {
|
||||
for _, opt := range src {
|
||||
switch opt := opt.(type) {
|
||||
case nil:
|
||||
continue
|
||||
case Options:
|
||||
dst = flattenOptions(dst, opt)
|
||||
case coreOption:
|
||||
dst = append(dst, opt)
|
||||
default:
|
||||
panic(fmt.Sprintf("invalid option type: %T", opt))
|
||||
}
|
||||
}
|
||||
return dst
|
||||
}
|
||||
-390
@@ -1,390 +0,0 @@
|
||||
// Copyright 2017, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package cmp
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"reflect"
|
||||
"strings"
|
||||
"unicode"
|
||||
"unicode/utf8"
|
||||
|
||||
"github.com/google/go-cmp/cmp/internal/value"
|
||||
)
|
||||
|
||||
// Path is a list of [PathStep] describing the sequence of operations to get
|
||||
// from some root type to the current position in the value tree.
|
||||
// The first Path element is always an operation-less [PathStep] that exists
|
||||
// simply to identify the initial type.
|
||||
//
|
||||
// When traversing structs with embedded structs, the embedded struct will
|
||||
// always be accessed as a field before traversing the fields of the
|
||||
// embedded struct themselves. That is, an exported field from the
|
||||
// embedded struct will never be accessed directly from the parent struct.
|
||||
type Path []PathStep
|
||||
|
||||
// PathStep is a union-type for specific operations to traverse
|
||||
// a value's tree structure. Users of this package never need to implement
|
||||
// these types as values of this type will be returned by this package.
|
||||
//
|
||||
// Implementations of this interface:
|
||||
// - [StructField]
|
||||
// - [SliceIndex]
|
||||
// - [MapIndex]
|
||||
// - [Indirect]
|
||||
// - [TypeAssertion]
|
||||
// - [Transform]
|
||||
type PathStep interface {
|
||||
String() string
|
||||
|
||||
// Type is the resulting type after performing the path step.
|
||||
Type() reflect.Type
|
||||
|
||||
// Values is the resulting values after performing the path step.
|
||||
// The type of each valid value is guaranteed to be identical to Type.
|
||||
//
|
||||
// In some cases, one or both may be invalid or have restrictions:
|
||||
// - For StructField, both are not interface-able if the current field
|
||||
// is unexported and the struct type is not explicitly permitted by
|
||||
// an Exporter to traverse unexported fields.
|
||||
// - For SliceIndex, one may be invalid if an element is missing from
|
||||
// either the x or y slice.
|
||||
// - For MapIndex, one may be invalid if an entry is missing from
|
||||
// either the x or y map.
|
||||
//
|
||||
// The provided values must not be mutated.
|
||||
Values() (vx, vy reflect.Value)
|
||||
}
|
||||
|
||||
var (
|
||||
_ PathStep = StructField{}
|
||||
_ PathStep = SliceIndex{}
|
||||
_ PathStep = MapIndex{}
|
||||
_ PathStep = Indirect{}
|
||||
_ PathStep = TypeAssertion{}
|
||||
_ PathStep = Transform{}
|
||||
)
|
||||
|
||||
func (pa *Path) push(s PathStep) {
|
||||
*pa = append(*pa, s)
|
||||
}
|
||||
|
||||
func (pa *Path) pop() {
|
||||
*pa = (*pa)[:len(*pa)-1]
|
||||
}
|
||||
|
||||
// Last returns the last [PathStep] in the Path.
|
||||
// If the path is empty, this returns a non-nil [PathStep]
|
||||
// that reports a nil [PathStep.Type].
|
||||
func (pa Path) Last() PathStep {
|
||||
return pa.Index(-1)
|
||||
}
|
||||
|
||||
// Index returns the ith step in the Path and supports negative indexing.
|
||||
// A negative index starts counting from the tail of the Path such that -1
|
||||
// refers to the last step, -2 refers to the second-to-last step, and so on.
|
||||
// If index is invalid, this returns a non-nil [PathStep]
|
||||
// that reports a nil [PathStep.Type].
|
||||
func (pa Path) Index(i int) PathStep {
|
||||
if i < 0 {
|
||||
i = len(pa) + i
|
||||
}
|
||||
if i < 0 || i >= len(pa) {
|
||||
return pathStep{}
|
||||
}
|
||||
return pa[i]
|
||||
}
|
||||
|
||||
// String returns the simplified path to a node.
|
||||
// The simplified path only contains struct field accesses.
|
||||
//
|
||||
// For example:
|
||||
//
|
||||
// MyMap.MySlices.MyField
|
||||
func (pa Path) String() string {
|
||||
var ss []string
|
||||
for _, s := range pa {
|
||||
if _, ok := s.(StructField); ok {
|
||||
ss = append(ss, s.String())
|
||||
}
|
||||
}
|
||||
return strings.TrimPrefix(strings.Join(ss, ""), ".")
|
||||
}
|
||||
|
||||
// GoString returns the path to a specific node using Go syntax.
|
||||
//
|
||||
// For example:
|
||||
//
|
||||
// (*root.MyMap["key"].(*mypkg.MyStruct).MySlices)[2][3].MyField
|
||||
func (pa Path) GoString() string {
|
||||
var ssPre, ssPost []string
|
||||
var numIndirect int
|
||||
for i, s := range pa {
|
||||
var nextStep PathStep
|
||||
if i+1 < len(pa) {
|
||||
nextStep = pa[i+1]
|
||||
}
|
||||
switch s := s.(type) {
|
||||
case Indirect:
|
||||
numIndirect++
|
||||
pPre, pPost := "(", ")"
|
||||
switch nextStep.(type) {
|
||||
case Indirect:
|
||||
continue // Next step is indirection, so let them batch up
|
||||
case StructField:
|
||||
numIndirect-- // Automatic indirection on struct fields
|
||||
case nil:
|
||||
pPre, pPost = "", "" // Last step; no need for parenthesis
|
||||
}
|
||||
if numIndirect > 0 {
|
||||
ssPre = append(ssPre, pPre+strings.Repeat("*", numIndirect))
|
||||
ssPost = append(ssPost, pPost)
|
||||
}
|
||||
numIndirect = 0
|
||||
continue
|
||||
case Transform:
|
||||
ssPre = append(ssPre, s.trans.name+"(")
|
||||
ssPost = append(ssPost, ")")
|
||||
continue
|
||||
}
|
||||
ssPost = append(ssPost, s.String())
|
||||
}
|
||||
for i, j := 0, len(ssPre)-1; i < j; i, j = i+1, j-1 {
|
||||
ssPre[i], ssPre[j] = ssPre[j], ssPre[i]
|
||||
}
|
||||
return strings.Join(ssPre, "") + strings.Join(ssPost, "")
|
||||
}
|
||||
|
||||
type pathStep struct {
|
||||
typ reflect.Type
|
||||
vx, vy reflect.Value
|
||||
}
|
||||
|
||||
func (ps pathStep) Type() reflect.Type { return ps.typ }
|
||||
func (ps pathStep) Values() (vx, vy reflect.Value) { return ps.vx, ps.vy }
|
||||
func (ps pathStep) String() string {
|
||||
if ps.typ == nil {
|
||||
return "<nil>"
|
||||
}
|
||||
s := value.TypeString(ps.typ, false)
|
||||
if s == "" || strings.ContainsAny(s, "{}\n") {
|
||||
return "root" // Type too simple or complex to print
|
||||
}
|
||||
return fmt.Sprintf("{%s}", s)
|
||||
}
|
||||
|
||||
// StructField is a [PathStep] that represents a struct field access
|
||||
// on a field called [StructField.Name].
|
||||
type StructField struct{ *structField }
|
||||
type structField struct {
|
||||
pathStep
|
||||
name string
|
||||
idx int
|
||||
|
||||
// These fields are used for forcibly accessing an unexported field.
|
||||
// pvx, pvy, and field are only valid if unexported is true.
|
||||
unexported bool
|
||||
mayForce bool // Forcibly allow visibility
|
||||
paddr bool // Was parent addressable?
|
||||
pvx, pvy reflect.Value // Parent values (always addressable)
|
||||
field reflect.StructField // Field information
|
||||
}
|
||||
|
||||
func (sf StructField) Type() reflect.Type { return sf.typ }
|
||||
func (sf StructField) Values() (vx, vy reflect.Value) {
|
||||
if !sf.unexported {
|
||||
return sf.vx, sf.vy // CanInterface reports true
|
||||
}
|
||||
|
||||
// Forcibly obtain read-write access to an unexported struct field.
|
||||
if sf.mayForce {
|
||||
vx = retrieveUnexportedField(sf.pvx, sf.field, sf.paddr)
|
||||
vy = retrieveUnexportedField(sf.pvy, sf.field, sf.paddr)
|
||||
return vx, vy // CanInterface reports true
|
||||
}
|
||||
return sf.vx, sf.vy // CanInterface reports false
|
||||
}
|
||||
func (sf StructField) String() string { return fmt.Sprintf(".%s", sf.name) }
|
||||
|
||||
// Name is the field name.
|
||||
func (sf StructField) Name() string { return sf.name }
|
||||
|
||||
// Index is the index of the field in the parent struct type.
|
||||
// See [reflect.Type.Field].
|
||||
func (sf StructField) Index() int { return sf.idx }
|
||||
|
||||
// SliceIndex is a [PathStep] that represents an index operation on
|
||||
// a slice or array at some index [SliceIndex.Key].
|
||||
type SliceIndex struct{ *sliceIndex }
|
||||
type sliceIndex struct {
|
||||
pathStep
|
||||
xkey, ykey int
|
||||
isSlice bool // False for reflect.Array
|
||||
}
|
||||
|
||||
func (si SliceIndex) Type() reflect.Type { return si.typ }
|
||||
func (si SliceIndex) Values() (vx, vy reflect.Value) { return si.vx, si.vy }
|
||||
func (si SliceIndex) String() string {
|
||||
switch {
|
||||
case si.xkey == si.ykey:
|
||||
return fmt.Sprintf("[%d]", si.xkey)
|
||||
case si.ykey == -1:
|
||||
// [5->?] means "I don't know where X[5] went"
|
||||
return fmt.Sprintf("[%d->?]", si.xkey)
|
||||
case si.xkey == -1:
|
||||
// [?->3] means "I don't know where Y[3] came from"
|
||||
return fmt.Sprintf("[?->%d]", si.ykey)
|
||||
default:
|
||||
// [5->3] means "X[5] moved to Y[3]"
|
||||
return fmt.Sprintf("[%d->%d]", si.xkey, si.ykey)
|
||||
}
|
||||
}
|
||||
|
||||
// Key is the index key; it may return -1 if in a split state
|
||||
func (si SliceIndex) Key() int {
|
||||
if si.xkey != si.ykey {
|
||||
return -1
|
||||
}
|
||||
return si.xkey
|
||||
}
|
||||
|
||||
// SplitKeys are the indexes for indexing into slices in the
|
||||
// x and y values, respectively. These indexes may differ due to the
|
||||
// insertion or removal of an element in one of the slices, causing
|
||||
// all of the indexes to be shifted. If an index is -1, then that
|
||||
// indicates that the element does not exist in the associated slice.
|
||||
//
|
||||
// [SliceIndex.Key] is guaranteed to return -1 if and only if the indexes
|
||||
// returned by SplitKeys are not the same. SplitKeys will never return -1 for
|
||||
// both indexes.
|
||||
func (si SliceIndex) SplitKeys() (ix, iy int) { return si.xkey, si.ykey }
|
||||
|
||||
// MapIndex is a [PathStep] that represents an index operation on a map at some index Key.
|
||||
type MapIndex struct{ *mapIndex }
|
||||
type mapIndex struct {
|
||||
pathStep
|
||||
key reflect.Value
|
||||
}
|
||||
|
||||
func (mi MapIndex) Type() reflect.Type { return mi.typ }
|
||||
func (mi MapIndex) Values() (vx, vy reflect.Value) { return mi.vx, mi.vy }
|
||||
func (mi MapIndex) String() string { return fmt.Sprintf("[%#v]", mi.key) }
|
||||
|
||||
// Key is the value of the map key.
|
||||
func (mi MapIndex) Key() reflect.Value { return mi.key }
|
||||
|
||||
// Indirect is a [PathStep] that represents pointer indirection on the parent type.
|
||||
type Indirect struct{ *indirect }
|
||||
type indirect struct {
|
||||
pathStep
|
||||
}
|
||||
|
||||
func (in Indirect) Type() reflect.Type { return in.typ }
|
||||
func (in Indirect) Values() (vx, vy reflect.Value) { return in.vx, in.vy }
|
||||
func (in Indirect) String() string { return "*" }
|
||||
|
||||
// TypeAssertion is a [PathStep] that represents a type assertion on an interface.
|
||||
type TypeAssertion struct{ *typeAssertion }
|
||||
type typeAssertion struct {
|
||||
pathStep
|
||||
}
|
||||
|
||||
func (ta TypeAssertion) Type() reflect.Type { return ta.typ }
|
||||
func (ta TypeAssertion) Values() (vx, vy reflect.Value) { return ta.vx, ta.vy }
|
||||
func (ta TypeAssertion) String() string { return fmt.Sprintf(".(%v)", value.TypeString(ta.typ, false)) }
|
||||
|
||||
// Transform is a [PathStep] that represents a transformation
|
||||
// from the parent type to the current type.
|
||||
type Transform struct{ *transform }
|
||||
type transform struct {
|
||||
pathStep
|
||||
trans *transformer
|
||||
}
|
||||
|
||||
func (tf Transform) Type() reflect.Type { return tf.typ }
|
||||
func (tf Transform) Values() (vx, vy reflect.Value) { return tf.vx, tf.vy }
|
||||
func (tf Transform) String() string { return fmt.Sprintf("%s()", tf.trans.name) }
|
||||
|
||||
// Name is the name of the [Transformer].
|
||||
func (tf Transform) Name() string { return tf.trans.name }
|
||||
|
||||
// Func is the function pointer to the transformer function.
|
||||
func (tf Transform) Func() reflect.Value { return tf.trans.fnc }
|
||||
|
||||
// Option returns the originally constructed [Transformer] option.
|
||||
// The == operator can be used to detect the exact option used.
|
||||
func (tf Transform) Option() Option { return tf.trans }
|
||||
|
||||
// pointerPath represents a dual-stack of pointers encountered when
|
||||
// recursively traversing the x and y values. This data structure supports
|
||||
// detection of cycles and determining whether the cycles are equal.
|
||||
// In Go, cycles can occur via pointers, slices, and maps.
|
||||
//
|
||||
// The pointerPath uses a map to represent a stack; where descension into a
|
||||
// pointer pushes the address onto the stack, and ascension from a pointer
|
||||
// pops the address from the stack. Thus, when traversing into a pointer from
|
||||
// reflect.Ptr, reflect.Slice element, or reflect.Map, we can detect cycles
|
||||
// by checking whether the pointer has already been visited. The cycle detection
|
||||
// uses a separate stack for the x and y values.
|
||||
//
|
||||
// If a cycle is detected we need to determine whether the two pointers
|
||||
// should be considered equal. The definition of equality chosen by Equal
|
||||
// requires two graphs to have the same structure. To determine this, both the
|
||||
// x and y values must have a cycle where the previous pointers were also
|
||||
// encountered together as a pair.
|
||||
//
|
||||
// Semantically, this is equivalent to augmenting Indirect, SliceIndex, and
|
||||
// MapIndex with pointer information for the x and y values.
|
||||
// Suppose px and py are two pointers to compare, we then search the
|
||||
// Path for whether px was ever encountered in the Path history of x, and
|
||||
// similarly so with py. If either side has a cycle, the comparison is only
|
||||
// equal if both px and py have a cycle resulting from the same PathStep.
|
||||
//
|
||||
// Using a map as a stack is more performant as we can perform cycle detection
|
||||
// in O(1) instead of O(N) where N is len(Path).
|
||||
type pointerPath struct {
|
||||
// mx is keyed by x pointers, where the value is the associated y pointer.
|
||||
mx map[value.Pointer]value.Pointer
|
||||
// my is keyed by y pointers, where the value is the associated x pointer.
|
||||
my map[value.Pointer]value.Pointer
|
||||
}
|
||||
|
||||
func (p *pointerPath) Init() {
|
||||
p.mx = make(map[value.Pointer]value.Pointer)
|
||||
p.my = make(map[value.Pointer]value.Pointer)
|
||||
}
|
||||
|
||||
// Push indicates intent to descend into pointers vx and vy where
|
||||
// visited reports whether either has been seen before. If visited before,
|
||||
// equal reports whether both pointers were encountered together.
|
||||
// Pop must be called if and only if the pointers were never visited.
|
||||
//
|
||||
// The pointers vx and vy must be a reflect.Ptr, reflect.Slice, or reflect.Map
|
||||
// and be non-nil.
|
||||
func (p pointerPath) Push(vx, vy reflect.Value) (equal, visited bool) {
|
||||
px := value.PointerOf(vx)
|
||||
py := value.PointerOf(vy)
|
||||
_, ok1 := p.mx[px]
|
||||
_, ok2 := p.my[py]
|
||||
if ok1 || ok2 {
|
||||
equal = p.mx[px] == py && p.my[py] == px // Pointers paired together
|
||||
return equal, true
|
||||
}
|
||||
p.mx[px] = py
|
||||
p.my[py] = px
|
||||
return false, false
|
||||
}
|
||||
|
||||
// Pop ascends from pointers vx and vy.
|
||||
func (p pointerPath) Pop(vx, vy reflect.Value) {
|
||||
delete(p.mx, value.PointerOf(vx))
|
||||
delete(p.my, value.PointerOf(vy))
|
||||
}
|
||||
|
||||
// isExported reports whether the identifier is exported.
|
||||
func isExported(id string) bool {
|
||||
r, _ := utf8.DecodeRuneInString(id)
|
||||
return unicode.IsUpper(r)
|
||||
}
|
||||
-54
@@ -1,54 +0,0 @@
|
||||
// Copyright 2017, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package cmp
|
||||
|
||||
// defaultReporter implements the reporter interface.
|
||||
//
|
||||
// As Equal serially calls the PushStep, Report, and PopStep methods, the
|
||||
// defaultReporter constructs a tree-based representation of the compared value
|
||||
// and the result of each comparison (see valueNode).
|
||||
//
|
||||
// When the String method is called, the FormatDiff method transforms the
|
||||
// valueNode tree into a textNode tree, which is a tree-based representation
|
||||
// of the textual output (see textNode).
|
||||
//
|
||||
// Lastly, the textNode.String method produces the final report as a string.
|
||||
type defaultReporter struct {
|
||||
root *valueNode
|
||||
curr *valueNode
|
||||
}
|
||||
|
||||
func (r *defaultReporter) PushStep(ps PathStep) {
|
||||
r.curr = r.curr.PushStep(ps)
|
||||
if r.root == nil {
|
||||
r.root = r.curr
|
||||
}
|
||||
}
|
||||
func (r *defaultReporter) Report(rs Result) {
|
||||
r.curr.Report(rs)
|
||||
}
|
||||
func (r *defaultReporter) PopStep() {
|
||||
r.curr = r.curr.PopStep()
|
||||
}
|
||||
|
||||
// String provides a full report of the differences detected as a structured
|
||||
// literal in pseudo-Go syntax. String may only be called after the entire tree
|
||||
// has been traversed.
|
||||
func (r *defaultReporter) String() string {
|
||||
assert(r.root != nil && r.curr == nil)
|
||||
if r.root.NumDiff == 0 {
|
||||
return ""
|
||||
}
|
||||
ptrs := new(pointerReferences)
|
||||
text := formatOptions{}.FormatDiff(r.root, ptrs)
|
||||
resolveReferences(text)
|
||||
return text.String()
|
||||
}
|
||||
|
||||
func assert(ok bool) {
|
||||
if !ok {
|
||||
panic("assertion failure")
|
||||
}
|
||||
}
|
||||
-433
@@ -1,433 +0,0 @@
|
||||
// Copyright 2019, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package cmp
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"reflect"
|
||||
)
|
||||
|
||||
// numContextRecords is the number of surrounding equal records to print.
|
||||
const numContextRecords = 2
|
||||
|
||||
type diffMode byte
|
||||
|
||||
const (
|
||||
diffUnknown diffMode = 0
|
||||
diffIdentical diffMode = ' '
|
||||
diffRemoved diffMode = '-'
|
||||
diffInserted diffMode = '+'
|
||||
)
|
||||
|
||||
type typeMode int
|
||||
|
||||
const (
|
||||
// emitType always prints the type.
|
||||
emitType typeMode = iota
|
||||
// elideType never prints the type.
|
||||
elideType
|
||||
// autoType prints the type only for composite kinds
|
||||
// (i.e., structs, slices, arrays, and maps).
|
||||
autoType
|
||||
)
|
||||
|
||||
type formatOptions struct {
|
||||
// DiffMode controls the output mode of FormatDiff.
|
||||
//
|
||||
// If diffUnknown, then produce a diff of the x and y values.
|
||||
// If diffIdentical, then emit values as if they were equal.
|
||||
// If diffRemoved, then only emit x values (ignoring y values).
|
||||
// If diffInserted, then only emit y values (ignoring x values).
|
||||
DiffMode diffMode
|
||||
|
||||
// TypeMode controls whether to print the type for the current node.
|
||||
//
|
||||
// As a general rule of thumb, we always print the type of the next node
|
||||
// after an interface, and always elide the type of the next node after
|
||||
// a slice or map node.
|
||||
TypeMode typeMode
|
||||
|
||||
// formatValueOptions are options specific to printing reflect.Values.
|
||||
formatValueOptions
|
||||
}
|
||||
|
||||
func (opts formatOptions) WithDiffMode(d diffMode) formatOptions {
|
||||
opts.DiffMode = d
|
||||
return opts
|
||||
}
|
||||
func (opts formatOptions) WithTypeMode(t typeMode) formatOptions {
|
||||
opts.TypeMode = t
|
||||
return opts
|
||||
}
|
||||
func (opts formatOptions) WithVerbosity(level int) formatOptions {
|
||||
opts.VerbosityLevel = level
|
||||
opts.LimitVerbosity = true
|
||||
return opts
|
||||
}
|
||||
func (opts formatOptions) verbosity() uint {
|
||||
switch {
|
||||
case opts.VerbosityLevel < 0:
|
||||
return 0
|
||||
case opts.VerbosityLevel > 16:
|
||||
return 16 // some reasonable maximum to avoid shift overflow
|
||||
default:
|
||||
return uint(opts.VerbosityLevel)
|
||||
}
|
||||
}
|
||||
|
||||
const maxVerbosityPreset = 6
|
||||
|
||||
// verbosityPreset modifies the verbosity settings given an index
|
||||
// between 0 and maxVerbosityPreset, inclusive.
|
||||
func verbosityPreset(opts formatOptions, i int) formatOptions {
|
||||
opts.VerbosityLevel = int(opts.verbosity()) + 2*i
|
||||
if i > 0 {
|
||||
opts.AvoidStringer = true
|
||||
}
|
||||
if i >= maxVerbosityPreset {
|
||||
opts.PrintAddresses = true
|
||||
opts.QualifiedNames = true
|
||||
}
|
||||
return opts
|
||||
}
|
||||
|
||||
// FormatDiff converts a valueNode tree into a textNode tree, where the later
|
||||
// is a textual representation of the differences detected in the former.
|
||||
func (opts formatOptions) FormatDiff(v *valueNode, ptrs *pointerReferences) (out textNode) {
|
||||
if opts.DiffMode == diffIdentical {
|
||||
opts = opts.WithVerbosity(1)
|
||||
} else if opts.verbosity() < 3 {
|
||||
opts = opts.WithVerbosity(3)
|
||||
}
|
||||
|
||||
// Check whether we have specialized formatting for this node.
|
||||
// This is not necessary, but helpful for producing more readable outputs.
|
||||
if opts.CanFormatDiffSlice(v) {
|
||||
return opts.FormatDiffSlice(v)
|
||||
}
|
||||
|
||||
var parentKind reflect.Kind
|
||||
if v.parent != nil && v.parent.TransformerName == "" {
|
||||
parentKind = v.parent.Type.Kind()
|
||||
}
|
||||
|
||||
// For leaf nodes, format the value based on the reflect.Values alone.
|
||||
// As a special case, treat equal []byte as a leaf nodes.
|
||||
isBytes := v.Type.Kind() == reflect.Slice && v.Type.Elem() == byteType
|
||||
isEqualBytes := isBytes && v.NumDiff+v.NumIgnored+v.NumTransformed == 0
|
||||
if v.MaxDepth == 0 || isEqualBytes {
|
||||
switch opts.DiffMode {
|
||||
case diffUnknown, diffIdentical:
|
||||
// Format Equal.
|
||||
if v.NumDiff == 0 {
|
||||
outx := opts.FormatValue(v.ValueX, parentKind, ptrs)
|
||||
outy := opts.FormatValue(v.ValueY, parentKind, ptrs)
|
||||
if v.NumIgnored > 0 && v.NumSame == 0 {
|
||||
return textEllipsis
|
||||
} else if outx.Len() < outy.Len() {
|
||||
return outx
|
||||
} else {
|
||||
return outy
|
||||
}
|
||||
}
|
||||
|
||||
// Format unequal.
|
||||
assert(opts.DiffMode == diffUnknown)
|
||||
var list textList
|
||||
outx := opts.WithTypeMode(elideType).FormatValue(v.ValueX, parentKind, ptrs)
|
||||
outy := opts.WithTypeMode(elideType).FormatValue(v.ValueY, parentKind, ptrs)
|
||||
for i := 0; i <= maxVerbosityPreset && outx != nil && outy != nil && outx.Equal(outy); i++ {
|
||||
opts2 := verbosityPreset(opts, i).WithTypeMode(elideType)
|
||||
outx = opts2.FormatValue(v.ValueX, parentKind, ptrs)
|
||||
outy = opts2.FormatValue(v.ValueY, parentKind, ptrs)
|
||||
}
|
||||
if outx != nil {
|
||||
list = append(list, textRecord{Diff: '-', Value: outx})
|
||||
}
|
||||
if outy != nil {
|
||||
list = append(list, textRecord{Diff: '+', Value: outy})
|
||||
}
|
||||
return opts.WithTypeMode(emitType).FormatType(v.Type, list)
|
||||
case diffRemoved:
|
||||
return opts.FormatValue(v.ValueX, parentKind, ptrs)
|
||||
case diffInserted:
|
||||
return opts.FormatValue(v.ValueY, parentKind, ptrs)
|
||||
default:
|
||||
panic("invalid diff mode")
|
||||
}
|
||||
}
|
||||
|
||||
// Register slice element to support cycle detection.
|
||||
if parentKind == reflect.Slice {
|
||||
ptrRefs := ptrs.PushPair(v.ValueX, v.ValueY, opts.DiffMode, true)
|
||||
defer ptrs.Pop()
|
||||
defer func() { out = wrapTrunkReferences(ptrRefs, out) }()
|
||||
}
|
||||
|
||||
// Descend into the child value node.
|
||||
if v.TransformerName != "" {
|
||||
out := opts.WithTypeMode(emitType).FormatDiff(v.Value, ptrs)
|
||||
out = &textWrap{Prefix: "Inverse(" + v.TransformerName + ", ", Value: out, Suffix: ")"}
|
||||
return opts.FormatType(v.Type, out)
|
||||
} else {
|
||||
switch k := v.Type.Kind(); k {
|
||||
case reflect.Struct, reflect.Array, reflect.Slice:
|
||||
out = opts.formatDiffList(v.Records, k, ptrs)
|
||||
out = opts.FormatType(v.Type, out)
|
||||
case reflect.Map:
|
||||
// Register map to support cycle detection.
|
||||
ptrRefs := ptrs.PushPair(v.ValueX, v.ValueY, opts.DiffMode, false)
|
||||
defer ptrs.Pop()
|
||||
|
||||
out = opts.formatDiffList(v.Records, k, ptrs)
|
||||
out = wrapTrunkReferences(ptrRefs, out)
|
||||
out = opts.FormatType(v.Type, out)
|
||||
case reflect.Ptr:
|
||||
// Register pointer to support cycle detection.
|
||||
ptrRefs := ptrs.PushPair(v.ValueX, v.ValueY, opts.DiffMode, false)
|
||||
defer ptrs.Pop()
|
||||
|
||||
out = opts.FormatDiff(v.Value, ptrs)
|
||||
out = wrapTrunkReferences(ptrRefs, out)
|
||||
out = &textWrap{Prefix: "&", Value: out}
|
||||
case reflect.Interface:
|
||||
out = opts.WithTypeMode(emitType).FormatDiff(v.Value, ptrs)
|
||||
default:
|
||||
panic(fmt.Sprintf("%v cannot have children", k))
|
||||
}
|
||||
return out
|
||||
}
|
||||
}
|
||||
|
||||
func (opts formatOptions) formatDiffList(recs []reportRecord, k reflect.Kind, ptrs *pointerReferences) textNode {
|
||||
// Derive record name based on the data structure kind.
|
||||
var name string
|
||||
var formatKey func(reflect.Value) string
|
||||
switch k {
|
||||
case reflect.Struct:
|
||||
name = "field"
|
||||
opts = opts.WithTypeMode(autoType)
|
||||
formatKey = func(v reflect.Value) string { return v.String() }
|
||||
case reflect.Slice, reflect.Array:
|
||||
name = "element"
|
||||
opts = opts.WithTypeMode(elideType)
|
||||
formatKey = func(reflect.Value) string { return "" }
|
||||
case reflect.Map:
|
||||
name = "entry"
|
||||
opts = opts.WithTypeMode(elideType)
|
||||
formatKey = func(v reflect.Value) string { return formatMapKey(v, false, ptrs) }
|
||||
}
|
||||
|
||||
maxLen := -1
|
||||
if opts.LimitVerbosity {
|
||||
if opts.DiffMode == diffIdentical {
|
||||
maxLen = ((1 << opts.verbosity()) >> 1) << 2 // 0, 4, 8, 16, 32, etc...
|
||||
} else {
|
||||
maxLen = (1 << opts.verbosity()) << 1 // 2, 4, 8, 16, 32, 64, etc...
|
||||
}
|
||||
opts.VerbosityLevel--
|
||||
}
|
||||
|
||||
// Handle unification.
|
||||
switch opts.DiffMode {
|
||||
case diffIdentical, diffRemoved, diffInserted:
|
||||
var list textList
|
||||
var deferredEllipsis bool // Add final "..." to indicate records were dropped
|
||||
for _, r := range recs {
|
||||
if len(list) == maxLen {
|
||||
deferredEllipsis = true
|
||||
break
|
||||
}
|
||||
|
||||
// Elide struct fields that are zero value.
|
||||
if k == reflect.Struct {
|
||||
var isZero bool
|
||||
switch opts.DiffMode {
|
||||
case diffIdentical:
|
||||
isZero = r.Value.ValueX.IsZero() || r.Value.ValueY.IsZero()
|
||||
case diffRemoved:
|
||||
isZero = r.Value.ValueX.IsZero()
|
||||
case diffInserted:
|
||||
isZero = r.Value.ValueY.IsZero()
|
||||
}
|
||||
if isZero {
|
||||
continue
|
||||
}
|
||||
}
|
||||
// Elide ignored nodes.
|
||||
if r.Value.NumIgnored > 0 && r.Value.NumSame+r.Value.NumDiff == 0 {
|
||||
deferredEllipsis = !(k == reflect.Slice || k == reflect.Array)
|
||||
if !deferredEllipsis {
|
||||
list.AppendEllipsis(diffStats{})
|
||||
}
|
||||
continue
|
||||
}
|
||||
if out := opts.FormatDiff(r.Value, ptrs); out != nil {
|
||||
list = append(list, textRecord{Key: formatKey(r.Key), Value: out})
|
||||
}
|
||||
}
|
||||
if deferredEllipsis {
|
||||
list.AppendEllipsis(diffStats{})
|
||||
}
|
||||
return &textWrap{Prefix: "{", Value: list, Suffix: "}"}
|
||||
case diffUnknown:
|
||||
default:
|
||||
panic("invalid diff mode")
|
||||
}
|
||||
|
||||
// Handle differencing.
|
||||
var numDiffs int
|
||||
var list textList
|
||||
var keys []reflect.Value // invariant: len(list) == len(keys)
|
||||
groups := coalesceAdjacentRecords(name, recs)
|
||||
maxGroup := diffStats{Name: name}
|
||||
for i, ds := range groups {
|
||||
if maxLen >= 0 && numDiffs >= maxLen {
|
||||
maxGroup = maxGroup.Append(ds)
|
||||
continue
|
||||
}
|
||||
|
||||
// Handle equal records.
|
||||
if ds.NumDiff() == 0 {
|
||||
// Compute the number of leading and trailing records to print.
|
||||
var numLo, numHi int
|
||||
numEqual := ds.NumIgnored + ds.NumIdentical
|
||||
for numLo < numContextRecords && numLo+numHi < numEqual && i != 0 {
|
||||
if r := recs[numLo].Value; r.NumIgnored > 0 && r.NumSame+r.NumDiff == 0 {
|
||||
break
|
||||
}
|
||||
numLo++
|
||||
}
|
||||
for numHi < numContextRecords && numLo+numHi < numEqual && i != len(groups)-1 {
|
||||
if r := recs[numEqual-numHi-1].Value; r.NumIgnored > 0 && r.NumSame+r.NumDiff == 0 {
|
||||
break
|
||||
}
|
||||
numHi++
|
||||
}
|
||||
if numEqual-(numLo+numHi) == 1 && ds.NumIgnored == 0 {
|
||||
numHi++ // Avoid pointless coalescing of a single equal record
|
||||
}
|
||||
|
||||
// Format the equal values.
|
||||
for _, r := range recs[:numLo] {
|
||||
out := opts.WithDiffMode(diffIdentical).FormatDiff(r.Value, ptrs)
|
||||
list = append(list, textRecord{Key: formatKey(r.Key), Value: out})
|
||||
keys = append(keys, r.Key)
|
||||
}
|
||||
if numEqual > numLo+numHi {
|
||||
ds.NumIdentical -= numLo + numHi
|
||||
list.AppendEllipsis(ds)
|
||||
for len(keys) < len(list) {
|
||||
keys = append(keys, reflect.Value{})
|
||||
}
|
||||
}
|
||||
for _, r := range recs[numEqual-numHi : numEqual] {
|
||||
out := opts.WithDiffMode(diffIdentical).FormatDiff(r.Value, ptrs)
|
||||
list = append(list, textRecord{Key: formatKey(r.Key), Value: out})
|
||||
keys = append(keys, r.Key)
|
||||
}
|
||||
recs = recs[numEqual:]
|
||||
continue
|
||||
}
|
||||
|
||||
// Handle unequal records.
|
||||
for _, r := range recs[:ds.NumDiff()] {
|
||||
switch {
|
||||
case opts.CanFormatDiffSlice(r.Value):
|
||||
out := opts.FormatDiffSlice(r.Value)
|
||||
list = append(list, textRecord{Key: formatKey(r.Key), Value: out})
|
||||
keys = append(keys, r.Key)
|
||||
case r.Value.NumChildren == r.Value.MaxDepth:
|
||||
outx := opts.WithDiffMode(diffRemoved).FormatDiff(r.Value, ptrs)
|
||||
outy := opts.WithDiffMode(diffInserted).FormatDiff(r.Value, ptrs)
|
||||
for i := 0; i <= maxVerbosityPreset && outx != nil && outy != nil && outx.Equal(outy); i++ {
|
||||
opts2 := verbosityPreset(opts, i)
|
||||
outx = opts2.WithDiffMode(diffRemoved).FormatDiff(r.Value, ptrs)
|
||||
outy = opts2.WithDiffMode(diffInserted).FormatDiff(r.Value, ptrs)
|
||||
}
|
||||
if outx != nil {
|
||||
list = append(list, textRecord{Diff: diffRemoved, Key: formatKey(r.Key), Value: outx})
|
||||
keys = append(keys, r.Key)
|
||||
}
|
||||
if outy != nil {
|
||||
list = append(list, textRecord{Diff: diffInserted, Key: formatKey(r.Key), Value: outy})
|
||||
keys = append(keys, r.Key)
|
||||
}
|
||||
default:
|
||||
out := opts.FormatDiff(r.Value, ptrs)
|
||||
list = append(list, textRecord{Key: formatKey(r.Key), Value: out})
|
||||
keys = append(keys, r.Key)
|
||||
}
|
||||
}
|
||||
recs = recs[ds.NumDiff():]
|
||||
numDiffs += ds.NumDiff()
|
||||
}
|
||||
if maxGroup.IsZero() {
|
||||
assert(len(recs) == 0)
|
||||
} else {
|
||||
list.AppendEllipsis(maxGroup)
|
||||
for len(keys) < len(list) {
|
||||
keys = append(keys, reflect.Value{})
|
||||
}
|
||||
}
|
||||
assert(len(list) == len(keys))
|
||||
|
||||
// For maps, the default formatting logic uses fmt.Stringer which may
|
||||
// produce ambiguous output. Avoid calling String to disambiguate.
|
||||
if k == reflect.Map {
|
||||
var ambiguous bool
|
||||
seenKeys := map[string]reflect.Value{}
|
||||
for i, currKey := range keys {
|
||||
if currKey.IsValid() {
|
||||
strKey := list[i].Key
|
||||
prevKey, seen := seenKeys[strKey]
|
||||
if seen && prevKey.CanInterface() && currKey.CanInterface() {
|
||||
ambiguous = prevKey.Interface() != currKey.Interface()
|
||||
if ambiguous {
|
||||
break
|
||||
}
|
||||
}
|
||||
seenKeys[strKey] = currKey
|
||||
}
|
||||
}
|
||||
if ambiguous {
|
||||
for i, k := range keys {
|
||||
if k.IsValid() {
|
||||
list[i].Key = formatMapKey(k, true, ptrs)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return &textWrap{Prefix: "{", Value: list, Suffix: "}"}
|
||||
}
|
||||
|
||||
// coalesceAdjacentRecords coalesces the list of records into groups of
|
||||
// adjacent equal, or unequal counts.
|
||||
func coalesceAdjacentRecords(name string, recs []reportRecord) (groups []diffStats) {
|
||||
var prevCase int // Arbitrary index into which case last occurred
|
||||
lastStats := func(i int) *diffStats {
|
||||
if prevCase != i {
|
||||
groups = append(groups, diffStats{Name: name})
|
||||
prevCase = i
|
||||
}
|
||||
return &groups[len(groups)-1]
|
||||
}
|
||||
for _, r := range recs {
|
||||
switch rv := r.Value; {
|
||||
case rv.NumIgnored > 0 && rv.NumSame+rv.NumDiff == 0:
|
||||
lastStats(1).NumIgnored++
|
||||
case rv.NumDiff == 0:
|
||||
lastStats(1).NumIdentical++
|
||||
case rv.NumDiff > 0 && !rv.ValueY.IsValid():
|
||||
lastStats(2).NumRemoved++
|
||||
case rv.NumDiff > 0 && !rv.ValueX.IsValid():
|
||||
lastStats(2).NumInserted++
|
||||
default:
|
||||
lastStats(2).NumModified++
|
||||
}
|
||||
}
|
||||
return groups
|
||||
}
|
||||
-264
@@ -1,264 +0,0 @@
|
||||
// Copyright 2020, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package cmp
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"reflect"
|
||||
"strings"
|
||||
|
||||
"github.com/google/go-cmp/cmp/internal/flags"
|
||||
"github.com/google/go-cmp/cmp/internal/value"
|
||||
)
|
||||
|
||||
const (
|
||||
pointerDelimPrefix = "⟪"
|
||||
pointerDelimSuffix = "⟫"
|
||||
)
|
||||
|
||||
// formatPointer prints the address of the pointer.
|
||||
func formatPointer(p value.Pointer, withDelims bool) string {
|
||||
v := p.Uintptr()
|
||||
if flags.Deterministic {
|
||||
v = 0xdeadf00f // Only used for stable testing purposes
|
||||
}
|
||||
if withDelims {
|
||||
return pointerDelimPrefix + formatHex(uint64(v)) + pointerDelimSuffix
|
||||
}
|
||||
return formatHex(uint64(v))
|
||||
}
|
||||
|
||||
// pointerReferences is a stack of pointers visited so far.
|
||||
type pointerReferences [][2]value.Pointer
|
||||
|
||||
func (ps *pointerReferences) PushPair(vx, vy reflect.Value, d diffMode, deref bool) (pp [2]value.Pointer) {
|
||||
if deref && vx.IsValid() {
|
||||
vx = vx.Addr()
|
||||
}
|
||||
if deref && vy.IsValid() {
|
||||
vy = vy.Addr()
|
||||
}
|
||||
switch d {
|
||||
case diffUnknown, diffIdentical:
|
||||
pp = [2]value.Pointer{value.PointerOf(vx), value.PointerOf(vy)}
|
||||
case diffRemoved:
|
||||
pp = [2]value.Pointer{value.PointerOf(vx), value.Pointer{}}
|
||||
case diffInserted:
|
||||
pp = [2]value.Pointer{value.Pointer{}, value.PointerOf(vy)}
|
||||
}
|
||||
*ps = append(*ps, pp)
|
||||
return pp
|
||||
}
|
||||
|
||||
func (ps *pointerReferences) Push(v reflect.Value) (p value.Pointer, seen bool) {
|
||||
p = value.PointerOf(v)
|
||||
for _, pp := range *ps {
|
||||
if p == pp[0] || p == pp[1] {
|
||||
return p, true
|
||||
}
|
||||
}
|
||||
*ps = append(*ps, [2]value.Pointer{p, p})
|
||||
return p, false
|
||||
}
|
||||
|
||||
func (ps *pointerReferences) Pop() {
|
||||
*ps = (*ps)[:len(*ps)-1]
|
||||
}
|
||||
|
||||
// trunkReferences is metadata for a textNode indicating that the sub-tree
|
||||
// represents the value for either pointer in a pair of references.
|
||||
type trunkReferences struct{ pp [2]value.Pointer }
|
||||
|
||||
// trunkReference is metadata for a textNode indicating that the sub-tree
|
||||
// represents the value for the given pointer reference.
|
||||
type trunkReference struct{ p value.Pointer }
|
||||
|
||||
// leafReference is metadata for a textNode indicating that the value is
|
||||
// truncated as it refers to another part of the tree (i.e., a trunk).
|
||||
type leafReference struct{ p value.Pointer }
|
||||
|
||||
func wrapTrunkReferences(pp [2]value.Pointer, s textNode) textNode {
|
||||
switch {
|
||||
case pp[0].IsNil():
|
||||
return &textWrap{Value: s, Metadata: trunkReference{pp[1]}}
|
||||
case pp[1].IsNil():
|
||||
return &textWrap{Value: s, Metadata: trunkReference{pp[0]}}
|
||||
case pp[0] == pp[1]:
|
||||
return &textWrap{Value: s, Metadata: trunkReference{pp[0]}}
|
||||
default:
|
||||
return &textWrap{Value: s, Metadata: trunkReferences{pp}}
|
||||
}
|
||||
}
|
||||
func wrapTrunkReference(p value.Pointer, printAddress bool, s textNode) textNode {
|
||||
var prefix string
|
||||
if printAddress {
|
||||
prefix = formatPointer(p, true)
|
||||
}
|
||||
return &textWrap{Prefix: prefix, Value: s, Metadata: trunkReference{p}}
|
||||
}
|
||||
func makeLeafReference(p value.Pointer, printAddress bool) textNode {
|
||||
out := &textWrap{Prefix: "(", Value: textEllipsis, Suffix: ")"}
|
||||
var prefix string
|
||||
if printAddress {
|
||||
prefix = formatPointer(p, true)
|
||||
}
|
||||
return &textWrap{Prefix: prefix, Value: out, Metadata: leafReference{p}}
|
||||
}
|
||||
|
||||
// resolveReferences walks the textNode tree searching for any leaf reference
|
||||
// metadata and resolves each against the corresponding trunk references.
|
||||
// Since pointer addresses in memory are not particularly readable to the user,
|
||||
// it replaces each pointer value with an arbitrary and unique reference ID.
|
||||
func resolveReferences(s textNode) {
|
||||
var walkNodes func(textNode, func(textNode))
|
||||
walkNodes = func(s textNode, f func(textNode)) {
|
||||
f(s)
|
||||
switch s := s.(type) {
|
||||
case *textWrap:
|
||||
walkNodes(s.Value, f)
|
||||
case textList:
|
||||
for _, r := range s {
|
||||
walkNodes(r.Value, f)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Collect all trunks and leaves with reference metadata.
|
||||
var trunks, leaves []*textWrap
|
||||
walkNodes(s, func(s textNode) {
|
||||
if s, ok := s.(*textWrap); ok {
|
||||
switch s.Metadata.(type) {
|
||||
case leafReference:
|
||||
leaves = append(leaves, s)
|
||||
case trunkReference, trunkReferences:
|
||||
trunks = append(trunks, s)
|
||||
}
|
||||
}
|
||||
})
|
||||
|
||||
// No leaf references to resolve.
|
||||
if len(leaves) == 0 {
|
||||
return
|
||||
}
|
||||
|
||||
// Collect the set of all leaf references to resolve.
|
||||
leafPtrs := make(map[value.Pointer]bool)
|
||||
for _, leaf := range leaves {
|
||||
leafPtrs[leaf.Metadata.(leafReference).p] = true
|
||||
}
|
||||
|
||||
// Collect the set of trunk pointers that are always paired together.
|
||||
// This allows us to assign a single ID to both pointers for brevity.
|
||||
// If a pointer in a pair ever occurs by itself or as a different pair,
|
||||
// then the pair is broken.
|
||||
pairedTrunkPtrs := make(map[value.Pointer]value.Pointer)
|
||||
unpair := func(p value.Pointer) {
|
||||
if !pairedTrunkPtrs[p].IsNil() {
|
||||
pairedTrunkPtrs[pairedTrunkPtrs[p]] = value.Pointer{} // invalidate other half
|
||||
}
|
||||
pairedTrunkPtrs[p] = value.Pointer{} // invalidate this half
|
||||
}
|
||||
for _, trunk := range trunks {
|
||||
switch p := trunk.Metadata.(type) {
|
||||
case trunkReference:
|
||||
unpair(p.p) // standalone pointer cannot be part of a pair
|
||||
case trunkReferences:
|
||||
p0, ok0 := pairedTrunkPtrs[p.pp[0]]
|
||||
p1, ok1 := pairedTrunkPtrs[p.pp[1]]
|
||||
switch {
|
||||
case !ok0 && !ok1:
|
||||
// Register the newly seen pair.
|
||||
pairedTrunkPtrs[p.pp[0]] = p.pp[1]
|
||||
pairedTrunkPtrs[p.pp[1]] = p.pp[0]
|
||||
case ok0 && ok1 && p0 == p.pp[1] && p1 == p.pp[0]:
|
||||
// Exact pair already seen; do nothing.
|
||||
default:
|
||||
// Pair conflicts with some other pair; break all pairs.
|
||||
unpair(p.pp[0])
|
||||
unpair(p.pp[1])
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Correlate each pointer referenced by leaves to a unique identifier,
|
||||
// and print the IDs for each trunk that matches those pointers.
|
||||
var nextID uint
|
||||
ptrIDs := make(map[value.Pointer]uint)
|
||||
newID := func() uint {
|
||||
id := nextID
|
||||
nextID++
|
||||
return id
|
||||
}
|
||||
for _, trunk := range trunks {
|
||||
switch p := trunk.Metadata.(type) {
|
||||
case trunkReference:
|
||||
if print := leafPtrs[p.p]; print {
|
||||
id, ok := ptrIDs[p.p]
|
||||
if !ok {
|
||||
id = newID()
|
||||
ptrIDs[p.p] = id
|
||||
}
|
||||
trunk.Prefix = updateReferencePrefix(trunk.Prefix, formatReference(id))
|
||||
}
|
||||
case trunkReferences:
|
||||
print0 := leafPtrs[p.pp[0]]
|
||||
print1 := leafPtrs[p.pp[1]]
|
||||
if print0 || print1 {
|
||||
id0, ok0 := ptrIDs[p.pp[0]]
|
||||
id1, ok1 := ptrIDs[p.pp[1]]
|
||||
isPair := pairedTrunkPtrs[p.pp[0]] == p.pp[1] && pairedTrunkPtrs[p.pp[1]] == p.pp[0]
|
||||
if isPair {
|
||||
var id uint
|
||||
assert(ok0 == ok1) // must be seen together or not at all
|
||||
if ok0 {
|
||||
assert(id0 == id1) // must have the same ID
|
||||
id = id0
|
||||
} else {
|
||||
id = newID()
|
||||
ptrIDs[p.pp[0]] = id
|
||||
ptrIDs[p.pp[1]] = id
|
||||
}
|
||||
trunk.Prefix = updateReferencePrefix(trunk.Prefix, formatReference(id))
|
||||
} else {
|
||||
if print0 && !ok0 {
|
||||
id0 = newID()
|
||||
ptrIDs[p.pp[0]] = id0
|
||||
}
|
||||
if print1 && !ok1 {
|
||||
id1 = newID()
|
||||
ptrIDs[p.pp[1]] = id1
|
||||
}
|
||||
switch {
|
||||
case print0 && print1:
|
||||
trunk.Prefix = updateReferencePrefix(trunk.Prefix, formatReference(id0)+","+formatReference(id1))
|
||||
case print0:
|
||||
trunk.Prefix = updateReferencePrefix(trunk.Prefix, formatReference(id0))
|
||||
case print1:
|
||||
trunk.Prefix = updateReferencePrefix(trunk.Prefix, formatReference(id1))
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Update all leaf references with the unique identifier.
|
||||
for _, leaf := range leaves {
|
||||
if id, ok := ptrIDs[leaf.Metadata.(leafReference).p]; ok {
|
||||
leaf.Prefix = updateReferencePrefix(leaf.Prefix, formatReference(id))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func formatReference(id uint) string {
|
||||
return fmt.Sprintf("ref#%d", id)
|
||||
}
|
||||
|
||||
func updateReferencePrefix(prefix, ref string) string {
|
||||
if prefix == "" {
|
||||
return pointerDelimPrefix + ref + pointerDelimSuffix
|
||||
}
|
||||
suffix := strings.TrimPrefix(prefix, pointerDelimPrefix)
|
||||
return pointerDelimPrefix + ref + ": " + suffix
|
||||
}
|
||||
-414
@@ -1,414 +0,0 @@
|
||||
// Copyright 2019, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package cmp
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"reflect"
|
||||
"strconv"
|
||||
"strings"
|
||||
"unicode"
|
||||
"unicode/utf8"
|
||||
|
||||
"github.com/google/go-cmp/cmp/internal/value"
|
||||
)
|
||||
|
||||
var (
|
||||
anyType = reflect.TypeOf((*interface{})(nil)).Elem()
|
||||
stringType = reflect.TypeOf((*string)(nil)).Elem()
|
||||
bytesType = reflect.TypeOf((*[]byte)(nil)).Elem()
|
||||
byteType = reflect.TypeOf((*byte)(nil)).Elem()
|
||||
)
|
||||
|
||||
type formatValueOptions struct {
|
||||
// AvoidStringer controls whether to avoid calling custom stringer
|
||||
// methods like error.Error or fmt.Stringer.String.
|
||||
AvoidStringer bool
|
||||
|
||||
// PrintAddresses controls whether to print the address of all pointers,
|
||||
// slice elements, and maps.
|
||||
PrintAddresses bool
|
||||
|
||||
// QualifiedNames controls whether FormatType uses the fully qualified name
|
||||
// (including the full package path as opposed to just the package name).
|
||||
QualifiedNames bool
|
||||
|
||||
// VerbosityLevel controls the amount of output to produce.
|
||||
// A higher value produces more output. A value of zero or lower produces
|
||||
// no output (represented using an ellipsis).
|
||||
// If LimitVerbosity is false, then the level is treated as infinite.
|
||||
VerbosityLevel int
|
||||
|
||||
// LimitVerbosity specifies that formatting should respect VerbosityLevel.
|
||||
LimitVerbosity bool
|
||||
}
|
||||
|
||||
// FormatType prints the type as if it were wrapping s.
|
||||
// This may return s as-is depending on the current type and TypeMode mode.
|
||||
func (opts formatOptions) FormatType(t reflect.Type, s textNode) textNode {
|
||||
// Check whether to emit the type or not.
|
||||
switch opts.TypeMode {
|
||||
case autoType:
|
||||
switch t.Kind() {
|
||||
case reflect.Struct, reflect.Slice, reflect.Array, reflect.Map:
|
||||
if s.Equal(textNil) {
|
||||
return s
|
||||
}
|
||||
default:
|
||||
return s
|
||||
}
|
||||
if opts.DiffMode == diffIdentical {
|
||||
return s // elide type for identical nodes
|
||||
}
|
||||
case elideType:
|
||||
return s
|
||||
}
|
||||
|
||||
// Determine the type label, applying special handling for unnamed types.
|
||||
typeName := value.TypeString(t, opts.QualifiedNames)
|
||||
if t.Name() == "" {
|
||||
// According to Go grammar, certain type literals contain symbols that
|
||||
// do not strongly bind to the next lexicographical token (e.g., *T).
|
||||
switch t.Kind() {
|
||||
case reflect.Chan, reflect.Func, reflect.Ptr:
|
||||
typeName = "(" + typeName + ")"
|
||||
}
|
||||
}
|
||||
return &textWrap{Prefix: typeName, Value: wrapParens(s)}
|
||||
}
|
||||
|
||||
// wrapParens wraps s with a set of parenthesis, but avoids it if the
|
||||
// wrapped node itself is already surrounded by a pair of parenthesis or braces.
|
||||
// It handles unwrapping one level of pointer-reference nodes.
|
||||
func wrapParens(s textNode) textNode {
|
||||
var refNode *textWrap
|
||||
if s2, ok := s.(*textWrap); ok {
|
||||
// Unwrap a single pointer reference node.
|
||||
switch s2.Metadata.(type) {
|
||||
case leafReference, trunkReference, trunkReferences:
|
||||
refNode = s2
|
||||
if s3, ok := refNode.Value.(*textWrap); ok {
|
||||
s2 = s3
|
||||
}
|
||||
}
|
||||
|
||||
// Already has delimiters that make parenthesis unnecessary.
|
||||
hasParens := strings.HasPrefix(s2.Prefix, "(") && strings.HasSuffix(s2.Suffix, ")")
|
||||
hasBraces := strings.HasPrefix(s2.Prefix, "{") && strings.HasSuffix(s2.Suffix, "}")
|
||||
if hasParens || hasBraces {
|
||||
return s
|
||||
}
|
||||
}
|
||||
if refNode != nil {
|
||||
refNode.Value = &textWrap{Prefix: "(", Value: refNode.Value, Suffix: ")"}
|
||||
return s
|
||||
}
|
||||
return &textWrap{Prefix: "(", Value: s, Suffix: ")"}
|
||||
}
|
||||
|
||||
// FormatValue prints the reflect.Value, taking extra care to avoid descending
|
||||
// into pointers already in ptrs. As pointers are visited, ptrs is also updated.
|
||||
func (opts formatOptions) FormatValue(v reflect.Value, parentKind reflect.Kind, ptrs *pointerReferences) (out textNode) {
|
||||
if !v.IsValid() {
|
||||
return nil
|
||||
}
|
||||
t := v.Type()
|
||||
|
||||
// Check slice element for cycles.
|
||||
if parentKind == reflect.Slice {
|
||||
ptrRef, visited := ptrs.Push(v.Addr())
|
||||
if visited {
|
||||
return makeLeafReference(ptrRef, false)
|
||||
}
|
||||
defer ptrs.Pop()
|
||||
defer func() { out = wrapTrunkReference(ptrRef, false, out) }()
|
||||
}
|
||||
|
||||
// Check whether there is an Error or String method to call.
|
||||
if !opts.AvoidStringer && v.CanInterface() {
|
||||
// Avoid calling Error or String methods on nil receivers since many
|
||||
// implementations crash when doing so.
|
||||
if (t.Kind() != reflect.Ptr && t.Kind() != reflect.Interface) || !v.IsNil() {
|
||||
var prefix, strVal string
|
||||
func() {
|
||||
// Swallow and ignore any panics from String or Error.
|
||||
defer func() { recover() }()
|
||||
switch v := v.Interface().(type) {
|
||||
case error:
|
||||
strVal = v.Error()
|
||||
prefix = "e"
|
||||
case fmt.Stringer:
|
||||
strVal = v.String()
|
||||
prefix = "s"
|
||||
}
|
||||
}()
|
||||
if prefix != "" {
|
||||
return opts.formatString(prefix, strVal)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Check whether to explicitly wrap the result with the type.
|
||||
var skipType bool
|
||||
defer func() {
|
||||
if !skipType {
|
||||
out = opts.FormatType(t, out)
|
||||
}
|
||||
}()
|
||||
|
||||
switch t.Kind() {
|
||||
case reflect.Bool:
|
||||
return textLine(fmt.Sprint(v.Bool()))
|
||||
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
||||
return textLine(fmt.Sprint(v.Int()))
|
||||
case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
||||
return textLine(fmt.Sprint(v.Uint()))
|
||||
case reflect.Uint8:
|
||||
if parentKind == reflect.Slice || parentKind == reflect.Array {
|
||||
return textLine(formatHex(v.Uint()))
|
||||
}
|
||||
return textLine(fmt.Sprint(v.Uint()))
|
||||
case reflect.Uintptr:
|
||||
return textLine(formatHex(v.Uint()))
|
||||
case reflect.Float32, reflect.Float64:
|
||||
return textLine(fmt.Sprint(v.Float()))
|
||||
case reflect.Complex64, reflect.Complex128:
|
||||
return textLine(fmt.Sprint(v.Complex()))
|
||||
case reflect.String:
|
||||
return opts.formatString("", v.String())
|
||||
case reflect.UnsafePointer, reflect.Chan, reflect.Func:
|
||||
return textLine(formatPointer(value.PointerOf(v), true))
|
||||
case reflect.Struct:
|
||||
var list textList
|
||||
v := makeAddressable(v) // needed for retrieveUnexportedField
|
||||
maxLen := v.NumField()
|
||||
if opts.LimitVerbosity {
|
||||
maxLen = ((1 << opts.verbosity()) >> 1) << 2 // 0, 4, 8, 16, 32, etc...
|
||||
opts.VerbosityLevel--
|
||||
}
|
||||
for i := 0; i < v.NumField(); i++ {
|
||||
vv := v.Field(i)
|
||||
if vv.IsZero() {
|
||||
continue // Elide fields with zero values
|
||||
}
|
||||
if len(list) == maxLen {
|
||||
list.AppendEllipsis(diffStats{})
|
||||
break
|
||||
}
|
||||
sf := t.Field(i)
|
||||
if !isExported(sf.Name) {
|
||||
vv = retrieveUnexportedField(v, sf, true)
|
||||
}
|
||||
s := opts.WithTypeMode(autoType).FormatValue(vv, t.Kind(), ptrs)
|
||||
list = append(list, textRecord{Key: sf.Name, Value: s})
|
||||
}
|
||||
return &textWrap{Prefix: "{", Value: list, Suffix: "}"}
|
||||
case reflect.Slice:
|
||||
if v.IsNil() {
|
||||
return textNil
|
||||
}
|
||||
|
||||
// Check whether this is a []byte of text data.
|
||||
if t.Elem() == byteType {
|
||||
b := v.Bytes()
|
||||
isPrintSpace := func(r rune) bool { return unicode.IsPrint(r) || unicode.IsSpace(r) }
|
||||
if len(b) > 0 && utf8.Valid(b) && len(bytes.TrimFunc(b, isPrintSpace)) == 0 {
|
||||
out = opts.formatString("", string(b))
|
||||
skipType = true
|
||||
return opts.FormatType(t, out)
|
||||
}
|
||||
}
|
||||
|
||||
fallthrough
|
||||
case reflect.Array:
|
||||
maxLen := v.Len()
|
||||
if opts.LimitVerbosity {
|
||||
maxLen = ((1 << opts.verbosity()) >> 1) << 2 // 0, 4, 8, 16, 32, etc...
|
||||
opts.VerbosityLevel--
|
||||
}
|
||||
var list textList
|
||||
for i := 0; i < v.Len(); i++ {
|
||||
if len(list) == maxLen {
|
||||
list.AppendEllipsis(diffStats{})
|
||||
break
|
||||
}
|
||||
s := opts.WithTypeMode(elideType).FormatValue(v.Index(i), t.Kind(), ptrs)
|
||||
list = append(list, textRecord{Value: s})
|
||||
}
|
||||
|
||||
out = &textWrap{Prefix: "{", Value: list, Suffix: "}"}
|
||||
if t.Kind() == reflect.Slice && opts.PrintAddresses {
|
||||
header := fmt.Sprintf("ptr:%v, len:%d, cap:%d", formatPointer(value.PointerOf(v), false), v.Len(), v.Cap())
|
||||
out = &textWrap{Prefix: pointerDelimPrefix + header + pointerDelimSuffix, Value: out}
|
||||
}
|
||||
return out
|
||||
case reflect.Map:
|
||||
if v.IsNil() {
|
||||
return textNil
|
||||
}
|
||||
|
||||
// Check pointer for cycles.
|
||||
ptrRef, visited := ptrs.Push(v)
|
||||
if visited {
|
||||
return makeLeafReference(ptrRef, opts.PrintAddresses)
|
||||
}
|
||||
defer ptrs.Pop()
|
||||
|
||||
maxLen := v.Len()
|
||||
if opts.LimitVerbosity {
|
||||
maxLen = ((1 << opts.verbosity()) >> 1) << 2 // 0, 4, 8, 16, 32, etc...
|
||||
opts.VerbosityLevel--
|
||||
}
|
||||
var list textList
|
||||
for _, k := range value.SortKeys(v.MapKeys()) {
|
||||
if len(list) == maxLen {
|
||||
list.AppendEllipsis(diffStats{})
|
||||
break
|
||||
}
|
||||
sk := formatMapKey(k, false, ptrs)
|
||||
sv := opts.WithTypeMode(elideType).FormatValue(v.MapIndex(k), t.Kind(), ptrs)
|
||||
list = append(list, textRecord{Key: sk, Value: sv})
|
||||
}
|
||||
|
||||
out = &textWrap{Prefix: "{", Value: list, Suffix: "}"}
|
||||
out = wrapTrunkReference(ptrRef, opts.PrintAddresses, out)
|
||||
return out
|
||||
case reflect.Ptr:
|
||||
if v.IsNil() {
|
||||
return textNil
|
||||
}
|
||||
|
||||
// Check pointer for cycles.
|
||||
ptrRef, visited := ptrs.Push(v)
|
||||
if visited {
|
||||
out = makeLeafReference(ptrRef, opts.PrintAddresses)
|
||||
return &textWrap{Prefix: "&", Value: out}
|
||||
}
|
||||
defer ptrs.Pop()
|
||||
|
||||
// Skip the name only if this is an unnamed pointer type.
|
||||
// Otherwise taking the address of a value does not reproduce
|
||||
// the named pointer type.
|
||||
if v.Type().Name() == "" {
|
||||
skipType = true // Let the underlying value print the type instead
|
||||
}
|
||||
out = opts.FormatValue(v.Elem(), t.Kind(), ptrs)
|
||||
out = wrapTrunkReference(ptrRef, opts.PrintAddresses, out)
|
||||
out = &textWrap{Prefix: "&", Value: out}
|
||||
return out
|
||||
case reflect.Interface:
|
||||
if v.IsNil() {
|
||||
return textNil
|
||||
}
|
||||
// Interfaces accept different concrete types,
|
||||
// so configure the underlying value to explicitly print the type.
|
||||
return opts.WithTypeMode(emitType).FormatValue(v.Elem(), t.Kind(), ptrs)
|
||||
default:
|
||||
panic(fmt.Sprintf("%v kind not handled", v.Kind()))
|
||||
}
|
||||
}
|
||||
|
||||
func (opts formatOptions) formatString(prefix, s string) textNode {
|
||||
maxLen := len(s)
|
||||
maxLines := strings.Count(s, "\n") + 1
|
||||
if opts.LimitVerbosity {
|
||||
maxLen = (1 << opts.verbosity()) << 5 // 32, 64, 128, 256, etc...
|
||||
maxLines = (1 << opts.verbosity()) << 2 // 4, 8, 16, 32, 64, etc...
|
||||
}
|
||||
|
||||
// For multiline strings, use the triple-quote syntax,
|
||||
// but only use it when printing removed or inserted nodes since
|
||||
// we only want the extra verbosity for those cases.
|
||||
lines := strings.Split(strings.TrimSuffix(s, "\n"), "\n")
|
||||
isTripleQuoted := len(lines) >= 4 && (opts.DiffMode == '-' || opts.DiffMode == '+')
|
||||
for i := 0; i < len(lines) && isTripleQuoted; i++ {
|
||||
lines[i] = strings.TrimPrefix(strings.TrimSuffix(lines[i], "\r"), "\r") // trim leading/trailing carriage returns for legacy Windows endline support
|
||||
isPrintable := func(r rune) bool {
|
||||
return unicode.IsPrint(r) || r == '\t' // specially treat tab as printable
|
||||
}
|
||||
line := lines[i]
|
||||
isTripleQuoted = !strings.HasPrefix(strings.TrimPrefix(line, prefix), `"""`) && !strings.HasPrefix(line, "...") && strings.TrimFunc(line, isPrintable) == "" && len(line) <= maxLen
|
||||
}
|
||||
if isTripleQuoted {
|
||||
var list textList
|
||||
list = append(list, textRecord{Diff: opts.DiffMode, Value: textLine(prefix + `"""`), ElideComma: true})
|
||||
for i, line := range lines {
|
||||
if numElided := len(lines) - i; i == maxLines-1 && numElided > 1 {
|
||||
comment := commentString(fmt.Sprintf("%d elided lines", numElided))
|
||||
list = append(list, textRecord{Diff: opts.DiffMode, Value: textEllipsis, ElideComma: true, Comment: comment})
|
||||
break
|
||||
}
|
||||
list = append(list, textRecord{Diff: opts.DiffMode, Value: textLine(line), ElideComma: true})
|
||||
}
|
||||
list = append(list, textRecord{Diff: opts.DiffMode, Value: textLine(prefix + `"""`), ElideComma: true})
|
||||
return &textWrap{Prefix: "(", Value: list, Suffix: ")"}
|
||||
}
|
||||
|
||||
// Format the string as a single-line quoted string.
|
||||
if len(s) > maxLen+len(textEllipsis) {
|
||||
return textLine(prefix + formatString(s[:maxLen]) + string(textEllipsis))
|
||||
}
|
||||
return textLine(prefix + formatString(s))
|
||||
}
|
||||
|
||||
// formatMapKey formats v as if it were a map key.
|
||||
// The result is guaranteed to be a single line.
|
||||
func formatMapKey(v reflect.Value, disambiguate bool, ptrs *pointerReferences) string {
|
||||
var opts formatOptions
|
||||
opts.DiffMode = diffIdentical
|
||||
opts.TypeMode = elideType
|
||||
opts.PrintAddresses = disambiguate
|
||||
opts.AvoidStringer = disambiguate
|
||||
opts.QualifiedNames = disambiguate
|
||||
opts.VerbosityLevel = maxVerbosityPreset
|
||||
opts.LimitVerbosity = true
|
||||
s := opts.FormatValue(v, reflect.Map, ptrs).String()
|
||||
return strings.TrimSpace(s)
|
||||
}
|
||||
|
||||
// formatString prints s as a double-quoted or backtick-quoted string.
|
||||
func formatString(s string) string {
|
||||
// Use quoted string if it the same length as a raw string literal.
|
||||
// Otherwise, attempt to use the raw string form.
|
||||
qs := strconv.Quote(s)
|
||||
if len(qs) == 1+len(s)+1 {
|
||||
return qs
|
||||
}
|
||||
|
||||
// Disallow newlines to ensure output is a single line.
|
||||
// Only allow printable runes for readability purposes.
|
||||
rawInvalid := func(r rune) bool {
|
||||
return r == '`' || r == '\n' || !(unicode.IsPrint(r) || r == '\t')
|
||||
}
|
||||
if utf8.ValidString(s) && strings.IndexFunc(s, rawInvalid) < 0 {
|
||||
return "`" + s + "`"
|
||||
}
|
||||
return qs
|
||||
}
|
||||
|
||||
// formatHex prints u as a hexadecimal integer in Go notation.
|
||||
func formatHex(u uint64) string {
|
||||
var f string
|
||||
switch {
|
||||
case u <= 0xff:
|
||||
f = "0x%02x"
|
||||
case u <= 0xffff:
|
||||
f = "0x%04x"
|
||||
case u <= 0xffffff:
|
||||
f = "0x%06x"
|
||||
case u <= 0xffffffff:
|
||||
f = "0x%08x"
|
||||
case u <= 0xffffffffff:
|
||||
f = "0x%010x"
|
||||
case u <= 0xffffffffffff:
|
||||
f = "0x%012x"
|
||||
case u <= 0xffffffffffffff:
|
||||
f = "0x%014x"
|
||||
case u <= 0xffffffffffffffff:
|
||||
f = "0x%016x"
|
||||
}
|
||||
return fmt.Sprintf(f, u)
|
||||
}
|
||||
-614
@@ -1,614 +0,0 @@
|
||||
// Copyright 2019, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package cmp
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"math"
|
||||
"reflect"
|
||||
"strconv"
|
||||
"strings"
|
||||
"unicode"
|
||||
"unicode/utf8"
|
||||
|
||||
"github.com/google/go-cmp/cmp/internal/diff"
|
||||
)
|
||||
|
||||
// CanFormatDiffSlice reports whether we support custom formatting for nodes
|
||||
// that are slices of primitive kinds or strings.
|
||||
func (opts formatOptions) CanFormatDiffSlice(v *valueNode) bool {
|
||||
switch {
|
||||
case opts.DiffMode != diffUnknown:
|
||||
return false // Must be formatting in diff mode
|
||||
case v.NumDiff == 0:
|
||||
return false // No differences detected
|
||||
case !v.ValueX.IsValid() || !v.ValueY.IsValid():
|
||||
return false // Both values must be valid
|
||||
case v.NumIgnored > 0:
|
||||
return false // Some ignore option was used
|
||||
case v.NumTransformed > 0:
|
||||
return false // Some transform option was used
|
||||
case v.NumCompared > 1:
|
||||
return false // More than one comparison was used
|
||||
case v.NumCompared == 1 && v.Type.Name() != "":
|
||||
// The need for cmp to check applicability of options on every element
|
||||
// in a slice is a significant performance detriment for large []byte.
|
||||
// The workaround is to specify Comparer(bytes.Equal),
|
||||
// which enables cmp to compare []byte more efficiently.
|
||||
// If they differ, we still want to provide batched diffing.
|
||||
// The logic disallows named types since they tend to have their own
|
||||
// String method, with nicer formatting than what this provides.
|
||||
return false
|
||||
}
|
||||
|
||||
// Check whether this is an interface with the same concrete types.
|
||||
t := v.Type
|
||||
vx, vy := v.ValueX, v.ValueY
|
||||
if t.Kind() == reflect.Interface && !vx.IsNil() && !vy.IsNil() && vx.Elem().Type() == vy.Elem().Type() {
|
||||
vx, vy = vx.Elem(), vy.Elem()
|
||||
t = vx.Type()
|
||||
}
|
||||
|
||||
// Check whether we provide specialized diffing for this type.
|
||||
switch t.Kind() {
|
||||
case reflect.String:
|
||||
case reflect.Array, reflect.Slice:
|
||||
// Only slices of primitive types have specialized handling.
|
||||
switch t.Elem().Kind() {
|
||||
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
|
||||
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr,
|
||||
reflect.Bool, reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128:
|
||||
default:
|
||||
return false
|
||||
}
|
||||
|
||||
// Both slice values have to be non-empty.
|
||||
if t.Kind() == reflect.Slice && (vx.Len() == 0 || vy.Len() == 0) {
|
||||
return false
|
||||
}
|
||||
|
||||
// If a sufficient number of elements already differ,
|
||||
// use specialized formatting even if length requirement is not met.
|
||||
if v.NumDiff > v.NumSame {
|
||||
return true
|
||||
}
|
||||
default:
|
||||
return false
|
||||
}
|
||||
|
||||
// Use specialized string diffing for longer slices or strings.
|
||||
const minLength = 32
|
||||
return vx.Len() >= minLength && vy.Len() >= minLength
|
||||
}
|
||||
|
||||
// FormatDiffSlice prints a diff for the slices (or strings) represented by v.
|
||||
// This provides custom-tailored logic to make printing of differences in
|
||||
// textual strings and slices of primitive kinds more readable.
|
||||
func (opts formatOptions) FormatDiffSlice(v *valueNode) textNode {
|
||||
assert(opts.DiffMode == diffUnknown)
|
||||
t, vx, vy := v.Type, v.ValueX, v.ValueY
|
||||
if t.Kind() == reflect.Interface {
|
||||
vx, vy = vx.Elem(), vy.Elem()
|
||||
t = vx.Type()
|
||||
opts = opts.WithTypeMode(emitType)
|
||||
}
|
||||
|
||||
// Auto-detect the type of the data.
|
||||
var sx, sy string
|
||||
var ssx, ssy []string
|
||||
var isString, isMostlyText, isPureLinedText, isBinary bool
|
||||
switch {
|
||||
case t.Kind() == reflect.String:
|
||||
sx, sy = vx.String(), vy.String()
|
||||
isString = true
|
||||
case t.Kind() == reflect.Slice && t.Elem() == byteType:
|
||||
sx, sy = string(vx.Bytes()), string(vy.Bytes())
|
||||
isString = true
|
||||
case t.Kind() == reflect.Array:
|
||||
// Arrays need to be addressable for slice operations to work.
|
||||
vx2, vy2 := reflect.New(t).Elem(), reflect.New(t).Elem()
|
||||
vx2.Set(vx)
|
||||
vy2.Set(vy)
|
||||
vx, vy = vx2, vy2
|
||||
}
|
||||
if isString {
|
||||
var numTotalRunes, numValidRunes, numLines, lastLineIdx, maxLineLen int
|
||||
for i, r := range sx + sy {
|
||||
numTotalRunes++
|
||||
if (unicode.IsPrint(r) || unicode.IsSpace(r)) && r != utf8.RuneError {
|
||||
numValidRunes++
|
||||
}
|
||||
if r == '\n' {
|
||||
if maxLineLen < i-lastLineIdx {
|
||||
maxLineLen = i - lastLineIdx
|
||||
}
|
||||
lastLineIdx = i + 1
|
||||
numLines++
|
||||
}
|
||||
}
|
||||
isPureText := numValidRunes == numTotalRunes
|
||||
isMostlyText = float64(numValidRunes) > math.Floor(0.90*float64(numTotalRunes))
|
||||
isPureLinedText = isPureText && numLines >= 4 && maxLineLen <= 1024
|
||||
isBinary = !isMostlyText
|
||||
|
||||
// Avoid diffing by lines if it produces a significantly more complex
|
||||
// edit script than diffing by bytes.
|
||||
if isPureLinedText {
|
||||
ssx = strings.Split(sx, "\n")
|
||||
ssy = strings.Split(sy, "\n")
|
||||
esLines := diff.Difference(len(ssx), len(ssy), func(ix, iy int) diff.Result {
|
||||
return diff.BoolResult(ssx[ix] == ssy[iy])
|
||||
})
|
||||
esBytes := diff.Difference(len(sx), len(sy), func(ix, iy int) diff.Result {
|
||||
return diff.BoolResult(sx[ix] == sy[iy])
|
||||
})
|
||||
efficiencyLines := float64(esLines.Dist()) / float64(len(esLines))
|
||||
efficiencyBytes := float64(esBytes.Dist()) / float64(len(esBytes))
|
||||
quotedLength := len(strconv.Quote(sx + sy))
|
||||
unquotedLength := len(sx) + len(sy)
|
||||
escapeExpansionRatio := float64(quotedLength) / float64(unquotedLength)
|
||||
isPureLinedText = efficiencyLines < 4*efficiencyBytes || escapeExpansionRatio > 1.1
|
||||
}
|
||||
}
|
||||
|
||||
// Format the string into printable records.
|
||||
var list textList
|
||||
var delim string
|
||||
switch {
|
||||
// If the text appears to be multi-lined text,
|
||||
// then perform differencing across individual lines.
|
||||
case isPureLinedText:
|
||||
list = opts.formatDiffSlice(
|
||||
reflect.ValueOf(ssx), reflect.ValueOf(ssy), 1, "line",
|
||||
func(v reflect.Value, d diffMode) textRecord {
|
||||
s := formatString(v.Index(0).String())
|
||||
return textRecord{Diff: d, Value: textLine(s)}
|
||||
},
|
||||
)
|
||||
delim = "\n"
|
||||
|
||||
// If possible, use a custom triple-quote (""") syntax for printing
|
||||
// differences in a string literal. This format is more readable,
|
||||
// but has edge-cases where differences are visually indistinguishable.
|
||||
// This format is avoided under the following conditions:
|
||||
// - A line starts with `"""`
|
||||
// - A line starts with "..."
|
||||
// - A line contains non-printable characters
|
||||
// - Adjacent different lines differ only by whitespace
|
||||
//
|
||||
// For example:
|
||||
//
|
||||
// """
|
||||
// ... // 3 identical lines
|
||||
// foo
|
||||
// bar
|
||||
// - baz
|
||||
// + BAZ
|
||||
// """
|
||||
isTripleQuoted := true
|
||||
prevRemoveLines := map[string]bool{}
|
||||
prevInsertLines := map[string]bool{}
|
||||
var list2 textList
|
||||
list2 = append(list2, textRecord{Value: textLine(`"""`), ElideComma: true})
|
||||
for _, r := range list {
|
||||
if !r.Value.Equal(textEllipsis) {
|
||||
line, _ := strconv.Unquote(string(r.Value.(textLine)))
|
||||
line = strings.TrimPrefix(strings.TrimSuffix(line, "\r"), "\r") // trim leading/trailing carriage returns for legacy Windows endline support
|
||||
normLine := strings.Map(func(r rune) rune {
|
||||
if unicode.IsSpace(r) {
|
||||
return -1 // drop whitespace to avoid visually indistinguishable output
|
||||
}
|
||||
return r
|
||||
}, line)
|
||||
isPrintable := func(r rune) bool {
|
||||
return unicode.IsPrint(r) || r == '\t' // specially treat tab as printable
|
||||
}
|
||||
isTripleQuoted = !strings.HasPrefix(line, `"""`) && !strings.HasPrefix(line, "...") && strings.TrimFunc(line, isPrintable) == ""
|
||||
switch r.Diff {
|
||||
case diffRemoved:
|
||||
isTripleQuoted = isTripleQuoted && !prevInsertLines[normLine]
|
||||
prevRemoveLines[normLine] = true
|
||||
case diffInserted:
|
||||
isTripleQuoted = isTripleQuoted && !prevRemoveLines[normLine]
|
||||
prevInsertLines[normLine] = true
|
||||
}
|
||||
if !isTripleQuoted {
|
||||
break
|
||||
}
|
||||
r.Value = textLine(line)
|
||||
r.ElideComma = true
|
||||
}
|
||||
if !(r.Diff == diffRemoved || r.Diff == diffInserted) { // start a new non-adjacent difference group
|
||||
prevRemoveLines = map[string]bool{}
|
||||
prevInsertLines = map[string]bool{}
|
||||
}
|
||||
list2 = append(list2, r)
|
||||
}
|
||||
if r := list2[len(list2)-1]; r.Diff == diffIdentical && len(r.Value.(textLine)) == 0 {
|
||||
list2 = list2[:len(list2)-1] // elide single empty line at the end
|
||||
}
|
||||
list2 = append(list2, textRecord{Value: textLine(`"""`), ElideComma: true})
|
||||
if isTripleQuoted {
|
||||
var out textNode = &textWrap{Prefix: "(", Value: list2, Suffix: ")"}
|
||||
switch t.Kind() {
|
||||
case reflect.String:
|
||||
if t != stringType {
|
||||
out = opts.FormatType(t, out)
|
||||
}
|
||||
case reflect.Slice:
|
||||
// Always emit type for slices since the triple-quote syntax
|
||||
// looks like a string (not a slice).
|
||||
opts = opts.WithTypeMode(emitType)
|
||||
out = opts.FormatType(t, out)
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
// If the text appears to be single-lined text,
|
||||
// then perform differencing in approximately fixed-sized chunks.
|
||||
// The output is printed as quoted strings.
|
||||
case isMostlyText:
|
||||
list = opts.formatDiffSlice(
|
||||
reflect.ValueOf(sx), reflect.ValueOf(sy), 64, "byte",
|
||||
func(v reflect.Value, d diffMode) textRecord {
|
||||
s := formatString(v.String())
|
||||
return textRecord{Diff: d, Value: textLine(s)}
|
||||
},
|
||||
)
|
||||
|
||||
// If the text appears to be binary data,
|
||||
// then perform differencing in approximately fixed-sized chunks.
|
||||
// The output is inspired by hexdump.
|
||||
case isBinary:
|
||||
list = opts.formatDiffSlice(
|
||||
reflect.ValueOf(sx), reflect.ValueOf(sy), 16, "byte",
|
||||
func(v reflect.Value, d diffMode) textRecord {
|
||||
var ss []string
|
||||
for i := 0; i < v.Len(); i++ {
|
||||
ss = append(ss, formatHex(v.Index(i).Uint()))
|
||||
}
|
||||
s := strings.Join(ss, ", ")
|
||||
comment := commentString(fmt.Sprintf("%c|%v|", d, formatASCII(v.String())))
|
||||
return textRecord{Diff: d, Value: textLine(s), Comment: comment}
|
||||
},
|
||||
)
|
||||
|
||||
// For all other slices of primitive types,
|
||||
// then perform differencing in approximately fixed-sized chunks.
|
||||
// The size of each chunk depends on the width of the element kind.
|
||||
default:
|
||||
var chunkSize int
|
||||
if t.Elem().Kind() == reflect.Bool {
|
||||
chunkSize = 16
|
||||
} else {
|
||||
switch t.Elem().Bits() {
|
||||
case 8:
|
||||
chunkSize = 16
|
||||
case 16:
|
||||
chunkSize = 12
|
||||
case 32:
|
||||
chunkSize = 8
|
||||
default:
|
||||
chunkSize = 8
|
||||
}
|
||||
}
|
||||
list = opts.formatDiffSlice(
|
||||
vx, vy, chunkSize, t.Elem().Kind().String(),
|
||||
func(v reflect.Value, d diffMode) textRecord {
|
||||
var ss []string
|
||||
for i := 0; i < v.Len(); i++ {
|
||||
switch t.Elem().Kind() {
|
||||
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
||||
ss = append(ss, fmt.Sprint(v.Index(i).Int()))
|
||||
case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
||||
ss = append(ss, fmt.Sprint(v.Index(i).Uint()))
|
||||
case reflect.Uint8, reflect.Uintptr:
|
||||
ss = append(ss, formatHex(v.Index(i).Uint()))
|
||||
case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128:
|
||||
ss = append(ss, fmt.Sprint(v.Index(i).Interface()))
|
||||
}
|
||||
}
|
||||
s := strings.Join(ss, ", ")
|
||||
return textRecord{Diff: d, Value: textLine(s)}
|
||||
},
|
||||
)
|
||||
}
|
||||
|
||||
// Wrap the output with appropriate type information.
|
||||
var out textNode = &textWrap{Prefix: "{", Value: list, Suffix: "}"}
|
||||
if !isMostlyText {
|
||||
// The "{...}" byte-sequence literal is not valid Go syntax for strings.
|
||||
// Emit the type for extra clarity (e.g. "string{...}").
|
||||
if t.Kind() == reflect.String {
|
||||
opts = opts.WithTypeMode(emitType)
|
||||
}
|
||||
return opts.FormatType(t, out)
|
||||
}
|
||||
switch t.Kind() {
|
||||
case reflect.String:
|
||||
out = &textWrap{Prefix: "strings.Join(", Value: out, Suffix: fmt.Sprintf(", %q)", delim)}
|
||||
if t != stringType {
|
||||
out = opts.FormatType(t, out)
|
||||
}
|
||||
case reflect.Slice:
|
||||
out = &textWrap{Prefix: "bytes.Join(", Value: out, Suffix: fmt.Sprintf(", %q)", delim)}
|
||||
if t != bytesType {
|
||||
out = opts.FormatType(t, out)
|
||||
}
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
// formatASCII formats s as an ASCII string.
|
||||
// This is useful for printing binary strings in a semi-legible way.
|
||||
func formatASCII(s string) string {
|
||||
b := bytes.Repeat([]byte{'.'}, len(s))
|
||||
for i := 0; i < len(s); i++ {
|
||||
if ' ' <= s[i] && s[i] <= '~' {
|
||||
b[i] = s[i]
|
||||
}
|
||||
}
|
||||
return string(b)
|
||||
}
|
||||
|
||||
func (opts formatOptions) formatDiffSlice(
|
||||
vx, vy reflect.Value, chunkSize int, name string,
|
||||
makeRec func(reflect.Value, diffMode) textRecord,
|
||||
) (list textList) {
|
||||
eq := func(ix, iy int) bool {
|
||||
return vx.Index(ix).Interface() == vy.Index(iy).Interface()
|
||||
}
|
||||
es := diff.Difference(vx.Len(), vy.Len(), func(ix, iy int) diff.Result {
|
||||
return diff.BoolResult(eq(ix, iy))
|
||||
})
|
||||
|
||||
appendChunks := func(v reflect.Value, d diffMode) int {
|
||||
n0 := v.Len()
|
||||
for v.Len() > 0 {
|
||||
n := chunkSize
|
||||
if n > v.Len() {
|
||||
n = v.Len()
|
||||
}
|
||||
list = append(list, makeRec(v.Slice(0, n), d))
|
||||
v = v.Slice(n, v.Len())
|
||||
}
|
||||
return n0 - v.Len()
|
||||
}
|
||||
|
||||
var numDiffs int
|
||||
maxLen := -1
|
||||
if opts.LimitVerbosity {
|
||||
maxLen = (1 << opts.verbosity()) << 2 // 4, 8, 16, 32, 64, etc...
|
||||
opts.VerbosityLevel--
|
||||
}
|
||||
|
||||
groups := coalesceAdjacentEdits(name, es)
|
||||
groups = coalesceInterveningIdentical(groups, chunkSize/4)
|
||||
groups = cleanupSurroundingIdentical(groups, eq)
|
||||
maxGroup := diffStats{Name: name}
|
||||
for i, ds := range groups {
|
||||
if maxLen >= 0 && numDiffs >= maxLen {
|
||||
maxGroup = maxGroup.Append(ds)
|
||||
continue
|
||||
}
|
||||
|
||||
// Print equal.
|
||||
if ds.NumDiff() == 0 {
|
||||
// Compute the number of leading and trailing equal bytes to print.
|
||||
var numLo, numHi int
|
||||
numEqual := ds.NumIgnored + ds.NumIdentical
|
||||
for numLo < chunkSize*numContextRecords && numLo+numHi < numEqual && i != 0 {
|
||||
numLo++
|
||||
}
|
||||
for numHi < chunkSize*numContextRecords && numLo+numHi < numEqual && i != len(groups)-1 {
|
||||
numHi++
|
||||
}
|
||||
if numEqual-(numLo+numHi) <= chunkSize && ds.NumIgnored == 0 {
|
||||
numHi = numEqual - numLo // Avoid pointless coalescing of single equal row
|
||||
}
|
||||
|
||||
// Print the equal bytes.
|
||||
appendChunks(vx.Slice(0, numLo), diffIdentical)
|
||||
if numEqual > numLo+numHi {
|
||||
ds.NumIdentical -= numLo + numHi
|
||||
list.AppendEllipsis(ds)
|
||||
}
|
||||
appendChunks(vx.Slice(numEqual-numHi, numEqual), diffIdentical)
|
||||
vx = vx.Slice(numEqual, vx.Len())
|
||||
vy = vy.Slice(numEqual, vy.Len())
|
||||
continue
|
||||
}
|
||||
|
||||
// Print unequal.
|
||||
len0 := len(list)
|
||||
nx := appendChunks(vx.Slice(0, ds.NumIdentical+ds.NumRemoved+ds.NumModified), diffRemoved)
|
||||
vx = vx.Slice(nx, vx.Len())
|
||||
ny := appendChunks(vy.Slice(0, ds.NumIdentical+ds.NumInserted+ds.NumModified), diffInserted)
|
||||
vy = vy.Slice(ny, vy.Len())
|
||||
numDiffs += len(list) - len0
|
||||
}
|
||||
if maxGroup.IsZero() {
|
||||
assert(vx.Len() == 0 && vy.Len() == 0)
|
||||
} else {
|
||||
list.AppendEllipsis(maxGroup)
|
||||
}
|
||||
return list
|
||||
}
|
||||
|
||||
// coalesceAdjacentEdits coalesces the list of edits into groups of adjacent
|
||||
// equal or unequal counts.
|
||||
//
|
||||
// Example:
|
||||
//
|
||||
// Input: "..XXY...Y"
|
||||
// Output: [
|
||||
// {NumIdentical: 2},
|
||||
// {NumRemoved: 2, NumInserted 1},
|
||||
// {NumIdentical: 3},
|
||||
// {NumInserted: 1},
|
||||
// ]
|
||||
func coalesceAdjacentEdits(name string, es diff.EditScript) (groups []diffStats) {
|
||||
var prevMode byte
|
||||
lastStats := func(mode byte) *diffStats {
|
||||
if prevMode != mode {
|
||||
groups = append(groups, diffStats{Name: name})
|
||||
prevMode = mode
|
||||
}
|
||||
return &groups[len(groups)-1]
|
||||
}
|
||||
for _, e := range es {
|
||||
switch e {
|
||||
case diff.Identity:
|
||||
lastStats('=').NumIdentical++
|
||||
case diff.UniqueX:
|
||||
lastStats('!').NumRemoved++
|
||||
case diff.UniqueY:
|
||||
lastStats('!').NumInserted++
|
||||
case diff.Modified:
|
||||
lastStats('!').NumModified++
|
||||
}
|
||||
}
|
||||
return groups
|
||||
}
|
||||
|
||||
// coalesceInterveningIdentical coalesces sufficiently short (<= windowSize)
|
||||
// equal groups into adjacent unequal groups that currently result in a
|
||||
// dual inserted/removed printout. This acts as a high-pass filter to smooth
|
||||
// out high-frequency changes within the windowSize.
|
||||
//
|
||||
// Example:
|
||||
//
|
||||
// WindowSize: 16,
|
||||
// Input: [
|
||||
// {NumIdentical: 61}, // group 0
|
||||
// {NumRemoved: 3, NumInserted: 1}, // group 1
|
||||
// {NumIdentical: 6}, // ├── coalesce
|
||||
// {NumInserted: 2}, // ├── coalesce
|
||||
// {NumIdentical: 1}, // ├── coalesce
|
||||
// {NumRemoved: 9}, // └── coalesce
|
||||
// {NumIdentical: 64}, // group 2
|
||||
// {NumRemoved: 3, NumInserted: 1}, // group 3
|
||||
// {NumIdentical: 6}, // ├── coalesce
|
||||
// {NumInserted: 2}, // ├── coalesce
|
||||
// {NumIdentical: 1}, // ├── coalesce
|
||||
// {NumRemoved: 7}, // ├── coalesce
|
||||
// {NumIdentical: 1}, // ├── coalesce
|
||||
// {NumRemoved: 2}, // └── coalesce
|
||||
// {NumIdentical: 63}, // group 4
|
||||
// ]
|
||||
// Output: [
|
||||
// {NumIdentical: 61},
|
||||
// {NumIdentical: 7, NumRemoved: 12, NumInserted: 3},
|
||||
// {NumIdentical: 64},
|
||||
// {NumIdentical: 8, NumRemoved: 12, NumInserted: 3},
|
||||
// {NumIdentical: 63},
|
||||
// ]
|
||||
func coalesceInterveningIdentical(groups []diffStats, windowSize int) []diffStats {
|
||||
groups, groupsOrig := groups[:0], groups
|
||||
for i, ds := range groupsOrig {
|
||||
if len(groups) >= 2 && ds.NumDiff() > 0 {
|
||||
prev := &groups[len(groups)-2] // Unequal group
|
||||
curr := &groups[len(groups)-1] // Equal group
|
||||
next := &groupsOrig[i] // Unequal group
|
||||
hadX, hadY := prev.NumRemoved > 0, prev.NumInserted > 0
|
||||
hasX, hasY := next.NumRemoved > 0, next.NumInserted > 0
|
||||
if ((hadX || hasX) && (hadY || hasY)) && curr.NumIdentical <= windowSize {
|
||||
*prev = prev.Append(*curr).Append(*next)
|
||||
groups = groups[:len(groups)-1] // Truncate off equal group
|
||||
continue
|
||||
}
|
||||
}
|
||||
groups = append(groups, ds)
|
||||
}
|
||||
return groups
|
||||
}
|
||||
|
||||
// cleanupSurroundingIdentical scans through all unequal groups, and
|
||||
// moves any leading sequence of equal elements to the preceding equal group and
|
||||
// moves and trailing sequence of equal elements to the succeeding equal group.
|
||||
//
|
||||
// This is necessary since coalesceInterveningIdentical may coalesce edit groups
|
||||
// together such that leading/trailing spans of equal elements becomes possible.
|
||||
// Note that this can occur even with an optimal diffing algorithm.
|
||||
//
|
||||
// Example:
|
||||
//
|
||||
// Input: [
|
||||
// {NumIdentical: 61},
|
||||
// {NumIdentical: 1 , NumRemoved: 11, NumInserted: 2}, // assume 3 leading identical elements
|
||||
// {NumIdentical: 67},
|
||||
// {NumIdentical: 7, NumRemoved: 12, NumInserted: 3}, // assume 10 trailing identical elements
|
||||
// {NumIdentical: 54},
|
||||
// ]
|
||||
// Output: [
|
||||
// {NumIdentical: 64}, // incremented by 3
|
||||
// {NumRemoved: 9},
|
||||
// {NumIdentical: 67},
|
||||
// {NumRemoved: 9},
|
||||
// {NumIdentical: 64}, // incremented by 10
|
||||
// ]
|
||||
func cleanupSurroundingIdentical(groups []diffStats, eq func(i, j int) bool) []diffStats {
|
||||
var ix, iy int // indexes into sequence x and y
|
||||
for i, ds := range groups {
|
||||
// Handle equal group.
|
||||
if ds.NumDiff() == 0 {
|
||||
ix += ds.NumIdentical
|
||||
iy += ds.NumIdentical
|
||||
continue
|
||||
}
|
||||
|
||||
// Handle unequal group.
|
||||
nx := ds.NumIdentical + ds.NumRemoved + ds.NumModified
|
||||
ny := ds.NumIdentical + ds.NumInserted + ds.NumModified
|
||||
var numLeadingIdentical, numTrailingIdentical int
|
||||
for j := 0; j < nx && j < ny && eq(ix+j, iy+j); j++ {
|
||||
numLeadingIdentical++
|
||||
}
|
||||
for j := 0; j < nx && j < ny && eq(ix+nx-1-j, iy+ny-1-j); j++ {
|
||||
numTrailingIdentical++
|
||||
}
|
||||
if numIdentical := numLeadingIdentical + numTrailingIdentical; numIdentical > 0 {
|
||||
if numLeadingIdentical > 0 {
|
||||
// Remove leading identical span from this group and
|
||||
// insert it into the preceding group.
|
||||
if i-1 >= 0 {
|
||||
groups[i-1].NumIdentical += numLeadingIdentical
|
||||
} else {
|
||||
// No preceding group exists, so prepend a new group,
|
||||
// but do so after we finish iterating over all groups.
|
||||
defer func() {
|
||||
groups = append([]diffStats{{Name: groups[0].Name, NumIdentical: numLeadingIdentical}}, groups...)
|
||||
}()
|
||||
}
|
||||
// Increment indexes since the preceding group would have handled this.
|
||||
ix += numLeadingIdentical
|
||||
iy += numLeadingIdentical
|
||||
}
|
||||
if numTrailingIdentical > 0 {
|
||||
// Remove trailing identical span from this group and
|
||||
// insert it into the succeeding group.
|
||||
if i+1 < len(groups) {
|
||||
groups[i+1].NumIdentical += numTrailingIdentical
|
||||
} else {
|
||||
// No succeeding group exists, so append a new group,
|
||||
// but do so after we finish iterating over all groups.
|
||||
defer func() {
|
||||
groups = append(groups, diffStats{Name: groups[len(groups)-1].Name, NumIdentical: numTrailingIdentical})
|
||||
}()
|
||||
}
|
||||
// Do not increment indexes since the succeeding group will handle this.
|
||||
}
|
||||
|
||||
// Update this group since some identical elements were removed.
|
||||
nx -= numIdentical
|
||||
ny -= numIdentical
|
||||
groups[i] = diffStats{Name: ds.Name, NumRemoved: nx, NumInserted: ny}
|
||||
}
|
||||
ix += nx
|
||||
iy += ny
|
||||
}
|
||||
return groups
|
||||
}
|
||||
-432
@@ -1,432 +0,0 @@
|
||||
// Copyright 2019, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package cmp
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"math/rand"
|
||||
"strings"
|
||||
"time"
|
||||
"unicode/utf8"
|
||||
|
||||
"github.com/google/go-cmp/cmp/internal/flags"
|
||||
)
|
||||
|
||||
var randBool = rand.New(rand.NewSource(time.Now().Unix())).Intn(2) == 0
|
||||
|
||||
const maxColumnLength = 80
|
||||
|
||||
type indentMode int
|
||||
|
||||
func (n indentMode) appendIndent(b []byte, d diffMode) []byte {
|
||||
// The output of Diff is documented as being unstable to provide future
|
||||
// flexibility in changing the output for more humanly readable reports.
|
||||
// This logic intentionally introduces instability to the exact output
|
||||
// so that users can detect accidental reliance on stability early on,
|
||||
// rather than much later when an actual change to the format occurs.
|
||||
if flags.Deterministic || randBool {
|
||||
// Use regular spaces (U+0020).
|
||||
switch d {
|
||||
case diffUnknown, diffIdentical:
|
||||
b = append(b, " "...)
|
||||
case diffRemoved:
|
||||
b = append(b, "- "...)
|
||||
case diffInserted:
|
||||
b = append(b, "+ "...)
|
||||
}
|
||||
} else {
|
||||
// Use non-breaking spaces (U+00a0).
|
||||
switch d {
|
||||
case diffUnknown, diffIdentical:
|
||||
b = append(b, " "...)
|
||||
case diffRemoved:
|
||||
b = append(b, "- "...)
|
||||
case diffInserted:
|
||||
b = append(b, "+ "...)
|
||||
}
|
||||
}
|
||||
return repeatCount(n).appendChar(b, '\t')
|
||||
}
|
||||
|
||||
type repeatCount int
|
||||
|
||||
func (n repeatCount) appendChar(b []byte, c byte) []byte {
|
||||
for ; n > 0; n-- {
|
||||
b = append(b, c)
|
||||
}
|
||||
return b
|
||||
}
|
||||
|
||||
// textNode is a simplified tree-based representation of structured text.
|
||||
// Possible node types are textWrap, textList, or textLine.
|
||||
type textNode interface {
|
||||
// Len reports the length in bytes of a single-line version of the tree.
|
||||
// Nested textRecord.Diff and textRecord.Comment fields are ignored.
|
||||
Len() int
|
||||
// Equal reports whether the two trees are structurally identical.
|
||||
// Nested textRecord.Diff and textRecord.Comment fields are compared.
|
||||
Equal(textNode) bool
|
||||
// String returns the string representation of the text tree.
|
||||
// It is not guaranteed that len(x.String()) == x.Len(),
|
||||
// nor that x.String() == y.String() implies that x.Equal(y).
|
||||
String() string
|
||||
|
||||
// formatCompactTo formats the contents of the tree as a single-line string
|
||||
// to the provided buffer. Any nested textRecord.Diff and textRecord.Comment
|
||||
// fields are ignored.
|
||||
//
|
||||
// However, not all nodes in the tree should be collapsed as a single-line.
|
||||
// If a node can be collapsed as a single-line, it is replaced by a textLine
|
||||
// node. Since the top-level node cannot replace itself, this also returns
|
||||
// the current node itself.
|
||||
//
|
||||
// This does not mutate the receiver.
|
||||
formatCompactTo([]byte, diffMode) ([]byte, textNode)
|
||||
// formatExpandedTo formats the contents of the tree as a multi-line string
|
||||
// to the provided buffer. In order for column alignment to operate well,
|
||||
// formatCompactTo must be called before calling formatExpandedTo.
|
||||
formatExpandedTo([]byte, diffMode, indentMode) []byte
|
||||
}
|
||||
|
||||
// textWrap is a wrapper that concatenates a prefix and/or a suffix
|
||||
// to the underlying node.
|
||||
type textWrap struct {
|
||||
Prefix string // e.g., "bytes.Buffer{"
|
||||
Value textNode // textWrap | textList | textLine
|
||||
Suffix string // e.g., "}"
|
||||
Metadata interface{} // arbitrary metadata; has no effect on formatting
|
||||
}
|
||||
|
||||
func (s *textWrap) Len() int {
|
||||
return len(s.Prefix) + s.Value.Len() + len(s.Suffix)
|
||||
}
|
||||
func (s1 *textWrap) Equal(s2 textNode) bool {
|
||||
if s2, ok := s2.(*textWrap); ok {
|
||||
return s1.Prefix == s2.Prefix && s1.Value.Equal(s2.Value) && s1.Suffix == s2.Suffix
|
||||
}
|
||||
return false
|
||||
}
|
||||
func (s *textWrap) String() string {
|
||||
var d diffMode
|
||||
var n indentMode
|
||||
_, s2 := s.formatCompactTo(nil, d)
|
||||
b := n.appendIndent(nil, d) // Leading indent
|
||||
b = s2.formatExpandedTo(b, d, n) // Main body
|
||||
b = append(b, '\n') // Trailing newline
|
||||
return string(b)
|
||||
}
|
||||
func (s *textWrap) formatCompactTo(b []byte, d diffMode) ([]byte, textNode) {
|
||||
n0 := len(b) // Original buffer length
|
||||
b = append(b, s.Prefix...)
|
||||
b, s.Value = s.Value.formatCompactTo(b, d)
|
||||
b = append(b, s.Suffix...)
|
||||
if _, ok := s.Value.(textLine); ok {
|
||||
return b, textLine(b[n0:])
|
||||
}
|
||||
return b, s
|
||||
}
|
||||
func (s *textWrap) formatExpandedTo(b []byte, d diffMode, n indentMode) []byte {
|
||||
b = append(b, s.Prefix...)
|
||||
b = s.Value.formatExpandedTo(b, d, n)
|
||||
b = append(b, s.Suffix...)
|
||||
return b
|
||||
}
|
||||
|
||||
// textList is a comma-separated list of textWrap or textLine nodes.
|
||||
// The list may be formatted as multi-lines or single-line at the discretion
|
||||
// of the textList.formatCompactTo method.
|
||||
type textList []textRecord
|
||||
type textRecord struct {
|
||||
Diff diffMode // e.g., 0 or '-' or '+'
|
||||
Key string // e.g., "MyField"
|
||||
Value textNode // textWrap | textLine
|
||||
ElideComma bool // avoid trailing comma
|
||||
Comment fmt.Stringer // e.g., "6 identical fields"
|
||||
}
|
||||
|
||||
// AppendEllipsis appends a new ellipsis node to the list if none already
|
||||
// exists at the end. If cs is non-zero it coalesces the statistics with the
|
||||
// previous diffStats.
|
||||
func (s *textList) AppendEllipsis(ds diffStats) {
|
||||
hasStats := !ds.IsZero()
|
||||
if len(*s) == 0 || !(*s)[len(*s)-1].Value.Equal(textEllipsis) {
|
||||
if hasStats {
|
||||
*s = append(*s, textRecord{Value: textEllipsis, ElideComma: true, Comment: ds})
|
||||
} else {
|
||||
*s = append(*s, textRecord{Value: textEllipsis, ElideComma: true})
|
||||
}
|
||||
return
|
||||
}
|
||||
if hasStats {
|
||||
(*s)[len(*s)-1].Comment = (*s)[len(*s)-1].Comment.(diffStats).Append(ds)
|
||||
}
|
||||
}
|
||||
|
||||
func (s textList) Len() (n int) {
|
||||
for i, r := range s {
|
||||
n += len(r.Key)
|
||||
if r.Key != "" {
|
||||
n += len(": ")
|
||||
}
|
||||
n += r.Value.Len()
|
||||
if i < len(s)-1 {
|
||||
n += len(", ")
|
||||
}
|
||||
}
|
||||
return n
|
||||
}
|
||||
|
||||
func (s1 textList) Equal(s2 textNode) bool {
|
||||
if s2, ok := s2.(textList); ok {
|
||||
if len(s1) != len(s2) {
|
||||
return false
|
||||
}
|
||||
for i := range s1 {
|
||||
r1, r2 := s1[i], s2[i]
|
||||
if !(r1.Diff == r2.Diff && r1.Key == r2.Key && r1.Value.Equal(r2.Value) && r1.Comment == r2.Comment) {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func (s textList) String() string {
|
||||
return (&textWrap{Prefix: "{", Value: s, Suffix: "}"}).String()
|
||||
}
|
||||
|
||||
func (s textList) formatCompactTo(b []byte, d diffMode) ([]byte, textNode) {
|
||||
s = append(textList(nil), s...) // Avoid mutating original
|
||||
|
||||
// Determine whether we can collapse this list as a single line.
|
||||
n0 := len(b) // Original buffer length
|
||||
var multiLine bool
|
||||
for i, r := range s {
|
||||
if r.Diff == diffInserted || r.Diff == diffRemoved {
|
||||
multiLine = true
|
||||
}
|
||||
b = append(b, r.Key...)
|
||||
if r.Key != "" {
|
||||
b = append(b, ": "...)
|
||||
}
|
||||
b, s[i].Value = r.Value.formatCompactTo(b, d|r.Diff)
|
||||
if _, ok := s[i].Value.(textLine); !ok {
|
||||
multiLine = true
|
||||
}
|
||||
if r.Comment != nil {
|
||||
multiLine = true
|
||||
}
|
||||
if i < len(s)-1 {
|
||||
b = append(b, ", "...)
|
||||
}
|
||||
}
|
||||
// Force multi-lined output when printing a removed/inserted node that
|
||||
// is sufficiently long.
|
||||
if (d == diffInserted || d == diffRemoved) && len(b[n0:]) > maxColumnLength {
|
||||
multiLine = true
|
||||
}
|
||||
if !multiLine {
|
||||
return b, textLine(b[n0:])
|
||||
}
|
||||
return b, s
|
||||
}
|
||||
|
||||
func (s textList) formatExpandedTo(b []byte, d diffMode, n indentMode) []byte {
|
||||
alignKeyLens := s.alignLens(
|
||||
func(r textRecord) bool {
|
||||
_, isLine := r.Value.(textLine)
|
||||
return r.Key == "" || !isLine
|
||||
},
|
||||
func(r textRecord) int { return utf8.RuneCountInString(r.Key) },
|
||||
)
|
||||
alignValueLens := s.alignLens(
|
||||
func(r textRecord) bool {
|
||||
_, isLine := r.Value.(textLine)
|
||||
return !isLine || r.Value.Equal(textEllipsis) || r.Comment == nil
|
||||
},
|
||||
func(r textRecord) int { return utf8.RuneCount(r.Value.(textLine)) },
|
||||
)
|
||||
|
||||
// Format lists of simple lists in a batched form.
|
||||
// If the list is sequence of only textLine values,
|
||||
// then batch multiple values on a single line.
|
||||
var isSimple bool
|
||||
for _, r := range s {
|
||||
_, isLine := r.Value.(textLine)
|
||||
isSimple = r.Diff == 0 && r.Key == "" && isLine && r.Comment == nil
|
||||
if !isSimple {
|
||||
break
|
||||
}
|
||||
}
|
||||
if isSimple {
|
||||
n++
|
||||
var batch []byte
|
||||
emitBatch := func() {
|
||||
if len(batch) > 0 {
|
||||
b = n.appendIndent(append(b, '\n'), d)
|
||||
b = append(b, bytes.TrimRight(batch, " ")...)
|
||||
batch = batch[:0]
|
||||
}
|
||||
}
|
||||
for _, r := range s {
|
||||
line := r.Value.(textLine)
|
||||
if len(batch)+len(line)+len(", ") > maxColumnLength {
|
||||
emitBatch()
|
||||
}
|
||||
batch = append(batch, line...)
|
||||
batch = append(batch, ", "...)
|
||||
}
|
||||
emitBatch()
|
||||
n--
|
||||
return n.appendIndent(append(b, '\n'), d)
|
||||
}
|
||||
|
||||
// Format the list as a multi-lined output.
|
||||
n++
|
||||
for i, r := range s {
|
||||
b = n.appendIndent(append(b, '\n'), d|r.Diff)
|
||||
if r.Key != "" {
|
||||
b = append(b, r.Key+": "...)
|
||||
}
|
||||
b = alignKeyLens[i].appendChar(b, ' ')
|
||||
|
||||
b = r.Value.formatExpandedTo(b, d|r.Diff, n)
|
||||
if !r.ElideComma {
|
||||
b = append(b, ',')
|
||||
}
|
||||
b = alignValueLens[i].appendChar(b, ' ')
|
||||
|
||||
if r.Comment != nil {
|
||||
b = append(b, " // "+r.Comment.String()...)
|
||||
}
|
||||
}
|
||||
n--
|
||||
|
||||
return n.appendIndent(append(b, '\n'), d)
|
||||
}
|
||||
|
||||
func (s textList) alignLens(
|
||||
skipFunc func(textRecord) bool,
|
||||
lenFunc func(textRecord) int,
|
||||
) []repeatCount {
|
||||
var startIdx, endIdx, maxLen int
|
||||
lens := make([]repeatCount, len(s))
|
||||
for i, r := range s {
|
||||
if skipFunc(r) {
|
||||
for j := startIdx; j < endIdx && j < len(s); j++ {
|
||||
lens[j] = repeatCount(maxLen - lenFunc(s[j]))
|
||||
}
|
||||
startIdx, endIdx, maxLen = i+1, i+1, 0
|
||||
} else {
|
||||
if maxLen < lenFunc(r) {
|
||||
maxLen = lenFunc(r)
|
||||
}
|
||||
endIdx = i + 1
|
||||
}
|
||||
}
|
||||
for j := startIdx; j < endIdx && j < len(s); j++ {
|
||||
lens[j] = repeatCount(maxLen - lenFunc(s[j]))
|
||||
}
|
||||
return lens
|
||||
}
|
||||
|
||||
// textLine is a single-line segment of text and is always a leaf node
|
||||
// in the textNode tree.
|
||||
type textLine []byte
|
||||
|
||||
var (
|
||||
textNil = textLine("nil")
|
||||
textEllipsis = textLine("...")
|
||||
)
|
||||
|
||||
func (s textLine) Len() int {
|
||||
return len(s)
|
||||
}
|
||||
func (s1 textLine) Equal(s2 textNode) bool {
|
||||
if s2, ok := s2.(textLine); ok {
|
||||
return bytes.Equal([]byte(s1), []byte(s2))
|
||||
}
|
||||
return false
|
||||
}
|
||||
func (s textLine) String() string {
|
||||
return string(s)
|
||||
}
|
||||
func (s textLine) formatCompactTo(b []byte, d diffMode) ([]byte, textNode) {
|
||||
return append(b, s...), s
|
||||
}
|
||||
func (s textLine) formatExpandedTo(b []byte, _ diffMode, _ indentMode) []byte {
|
||||
return append(b, s...)
|
||||
}
|
||||
|
||||
type diffStats struct {
|
||||
Name string
|
||||
NumIgnored int
|
||||
NumIdentical int
|
||||
NumRemoved int
|
||||
NumInserted int
|
||||
NumModified int
|
||||
}
|
||||
|
||||
func (s diffStats) IsZero() bool {
|
||||
s.Name = ""
|
||||
return s == diffStats{}
|
||||
}
|
||||
|
||||
func (s diffStats) NumDiff() int {
|
||||
return s.NumRemoved + s.NumInserted + s.NumModified
|
||||
}
|
||||
|
||||
func (s diffStats) Append(ds diffStats) diffStats {
|
||||
assert(s.Name == ds.Name)
|
||||
s.NumIgnored += ds.NumIgnored
|
||||
s.NumIdentical += ds.NumIdentical
|
||||
s.NumRemoved += ds.NumRemoved
|
||||
s.NumInserted += ds.NumInserted
|
||||
s.NumModified += ds.NumModified
|
||||
return s
|
||||
}
|
||||
|
||||
// String prints a humanly-readable summary of coalesced records.
|
||||
//
|
||||
// Example:
|
||||
//
|
||||
// diffStats{Name: "Field", NumIgnored: 5}.String() => "5 ignored fields"
|
||||
func (s diffStats) String() string {
|
||||
var ss []string
|
||||
var sum int
|
||||
labels := [...]string{"ignored", "identical", "removed", "inserted", "modified"}
|
||||
counts := [...]int{s.NumIgnored, s.NumIdentical, s.NumRemoved, s.NumInserted, s.NumModified}
|
||||
for i, n := range counts {
|
||||
if n > 0 {
|
||||
ss = append(ss, fmt.Sprintf("%d %v", n, labels[i]))
|
||||
}
|
||||
sum += n
|
||||
}
|
||||
|
||||
// Pluralize the name (adjusting for some obscure English grammar rules).
|
||||
name := s.Name
|
||||
if sum > 1 {
|
||||
name += "s"
|
||||
if strings.HasSuffix(name, "ys") {
|
||||
name = name[:len(name)-2] + "ies" // e.g., "entrys" => "entries"
|
||||
}
|
||||
}
|
||||
|
||||
// Format the list according to English grammar (with Oxford comma).
|
||||
switch n := len(ss); n {
|
||||
case 0:
|
||||
return ""
|
||||
case 1, 2:
|
||||
return strings.Join(ss, " and ") + " " + name
|
||||
default:
|
||||
return strings.Join(ss[:n-1], ", ") + ", and " + ss[n-1] + " " + name
|
||||
}
|
||||
}
|
||||
|
||||
type commentString string
|
||||
|
||||
func (s commentString) String() string { return string(s) }
|
||||
-121
@@ -1,121 +0,0 @@
|
||||
// Copyright 2019, The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package cmp
|
||||
|
||||
import "reflect"
|
||||
|
||||
// valueNode represents a single node within a report, which is a
|
||||
// structured representation of the value tree, containing information
|
||||
// regarding which nodes are equal or not.
|
||||
type valueNode struct {
|
||||
parent *valueNode
|
||||
|
||||
Type reflect.Type
|
||||
ValueX reflect.Value
|
||||
ValueY reflect.Value
|
||||
|
||||
// NumSame is the number of leaf nodes that are equal.
|
||||
// All descendants are equal only if NumDiff is 0.
|
||||
NumSame int
|
||||
// NumDiff is the number of leaf nodes that are not equal.
|
||||
NumDiff int
|
||||
// NumIgnored is the number of leaf nodes that are ignored.
|
||||
NumIgnored int
|
||||
// NumCompared is the number of leaf nodes that were compared
|
||||
// using an Equal method or Comparer function.
|
||||
NumCompared int
|
||||
// NumTransformed is the number of non-leaf nodes that were transformed.
|
||||
NumTransformed int
|
||||
// NumChildren is the number of transitive descendants of this node.
|
||||
// This counts from zero; thus, leaf nodes have no descendants.
|
||||
NumChildren int
|
||||
// MaxDepth is the maximum depth of the tree. This counts from zero;
|
||||
// thus, leaf nodes have a depth of zero.
|
||||
MaxDepth int
|
||||
|
||||
// Records is a list of struct fields, slice elements, or map entries.
|
||||
Records []reportRecord // If populated, implies Value is not populated
|
||||
|
||||
// Value is the result of a transformation, pointer indirect, of
|
||||
// type assertion.
|
||||
Value *valueNode // If populated, implies Records is not populated
|
||||
|
||||
// TransformerName is the name of the transformer.
|
||||
TransformerName string // If non-empty, implies Value is populated
|
||||
}
|
||||
type reportRecord struct {
|
||||
Key reflect.Value // Invalid for slice element
|
||||
Value *valueNode
|
||||
}
|
||||
|
||||
func (parent *valueNode) PushStep(ps PathStep) (child *valueNode) {
|
||||
vx, vy := ps.Values()
|
||||
child = &valueNode{parent: parent, Type: ps.Type(), ValueX: vx, ValueY: vy}
|
||||
switch s := ps.(type) {
|
||||
case StructField:
|
||||
assert(parent.Value == nil)
|
||||
parent.Records = append(parent.Records, reportRecord{Key: reflect.ValueOf(s.Name()), Value: child})
|
||||
case SliceIndex:
|
||||
assert(parent.Value == nil)
|
||||
parent.Records = append(parent.Records, reportRecord{Value: child})
|
||||
case MapIndex:
|
||||
assert(parent.Value == nil)
|
||||
parent.Records = append(parent.Records, reportRecord{Key: s.Key(), Value: child})
|
||||
case Indirect:
|
||||
assert(parent.Value == nil && parent.Records == nil)
|
||||
parent.Value = child
|
||||
case TypeAssertion:
|
||||
assert(parent.Value == nil && parent.Records == nil)
|
||||
parent.Value = child
|
||||
case Transform:
|
||||
assert(parent.Value == nil && parent.Records == nil)
|
||||
parent.Value = child
|
||||
parent.TransformerName = s.Name()
|
||||
parent.NumTransformed++
|
||||
default:
|
||||
assert(parent == nil) // Must be the root step
|
||||
}
|
||||
return child
|
||||
}
|
||||
|
||||
func (r *valueNode) Report(rs Result) {
|
||||
assert(r.MaxDepth == 0) // May only be called on leaf nodes
|
||||
|
||||
if rs.ByIgnore() {
|
||||
r.NumIgnored++
|
||||
} else {
|
||||
if rs.Equal() {
|
||||
r.NumSame++
|
||||
} else {
|
||||
r.NumDiff++
|
||||
}
|
||||
}
|
||||
assert(r.NumSame+r.NumDiff+r.NumIgnored == 1)
|
||||
|
||||
if rs.ByMethod() {
|
||||
r.NumCompared++
|
||||
}
|
||||
if rs.ByFunc() {
|
||||
r.NumCompared++
|
||||
}
|
||||
assert(r.NumCompared <= 1)
|
||||
}
|
||||
|
||||
func (child *valueNode) PopStep() (parent *valueNode) {
|
||||
if child.parent == nil {
|
||||
return nil
|
||||
}
|
||||
parent = child.parent
|
||||
parent.NumSame += child.NumSame
|
||||
parent.NumDiff += child.NumDiff
|
||||
parent.NumIgnored += child.NumIgnored
|
||||
parent.NumCompared += child.NumCompared
|
||||
parent.NumTransformed += child.NumTransformed
|
||||
parent.NumChildren += child.NumChildren + 1
|
||||
if parent.MaxDepth < child.MaxDepth+1 {
|
||||
parent.MaxDepth = child.MaxDepth + 1
|
||||
}
|
||||
return parent
|
||||
}
|
||||
-54
@@ -1,54 +0,0 @@
|
||||
// Copyright 2020 Google LLC All Rights Reserved.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
// Package estargz adapts the containerd estargz package to our abstractions.
|
||||
package estargz
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"io"
|
||||
|
||||
"github.com/containerd/stargz-snapshotter/estargz"
|
||||
v1 "github.com/google/go-containerregistry/pkg/v1"
|
||||
)
|
||||
|
||||
// Assert that what we're returning is an io.ReadCloser
|
||||
var _ io.ReadCloser = (*estargz.Blob)(nil)
|
||||
|
||||
// ReadCloser reads uncompressed tarball input from the io.ReadCloser and
|
||||
// returns:
|
||||
// - An io.ReadCloser from which compressed data may be read, and
|
||||
// - A v1.Hash with the hash of the estargz table of contents, or
|
||||
// - An error if the estargz processing encountered a problem.
|
||||
//
|
||||
// Refer to estargz for the options:
|
||||
// https://pkg.go.dev/github.com/containerd/stargz-snapshotter/estargz@v0.4.1#Option
|
||||
func ReadCloser(r io.ReadCloser, opts ...estargz.Option) (*estargz.Blob, v1.Hash, error) {
|
||||
defer r.Close()
|
||||
|
||||
// TODO(#876): Avoid buffering into memory.
|
||||
bs, err := io.ReadAll(r)
|
||||
if err != nil {
|
||||
return nil, v1.Hash{}, err
|
||||
}
|
||||
br := bytes.NewReader(bs)
|
||||
|
||||
rc, err := estargz.Build(io.NewSectionReader(br, 0, int64(len(bs))), opts...)
|
||||
if err != nil {
|
||||
return nil, v1.Hash{}, err
|
||||
}
|
||||
|
||||
h, err := v1.NewHash(rc.TOCDigest().String())
|
||||
return rc, h, err
|
||||
}
|
||||
+1
-2
@@ -25,7 +25,6 @@ import (
|
||||
"github.com/docker/cli/cli/config/configfile"
|
||||
"github.com/docker/cli/cli/config/types"
|
||||
"github.com/google/go-containerregistry/pkg/name"
|
||||
"github.com/mitchellh/go-homedir"
|
||||
)
|
||||
|
||||
// Resource represents a registry or repository that can be authenticated against.
|
||||
@@ -95,7 +94,7 @@ func (dk *defaultKeychain) ResolveContext(_ context.Context, target Resource) (A
|
||||
|
||||
// First, check $HOME/.docker/config.json
|
||||
foundDockerConfig := false
|
||||
home, err := homedir.Dir()
|
||||
home, err := os.UserHomeDir()
|
||||
if err == nil {
|
||||
foundDockerConfig = fileExists(filepath.Join(home, ".docker/config.json"))
|
||||
}
|
||||
|
||||
+1
@@ -44,6 +44,7 @@ func Export(img v1.Image, w io.Writer) error {
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
defer rc.Close()
|
||||
_, err = io.Copy(w, rc)
|
||||
return err
|
||||
}
|
||||
|
||||
+2
-2
@@ -24,8 +24,8 @@ import (
|
||||
"strings"
|
||||
)
|
||||
|
||||
// Detect more complex forms of local references.
|
||||
var reLocal = regexp.MustCompile(`.*\.local(?:host)?(?::\d{1,5})?$`)
|
||||
// Detect more complex forms of localhost references.
|
||||
var reLocal = regexp.MustCompile(`.*\.localhost(?::\d{1,5})?$`)
|
||||
|
||||
// Detect the loopback IP (127.0.0.1)
|
||||
var reLoopback = regexp.MustCompile(regexp.QuoteMeta("127.0.0.1"))
|
||||
|
||||
+2
@@ -29,6 +29,7 @@ type Manifest struct {
|
||||
Layers []Descriptor `json:"layers"`
|
||||
Annotations map[string]string `json:"annotations,omitempty"`
|
||||
Subject *Descriptor `json:"subject,omitempty"`
|
||||
ArtifactType string `json:"artifactType,omitempty"`
|
||||
}
|
||||
|
||||
// IndexManifest represents an OCI image index in a structured way.
|
||||
@@ -38,6 +39,7 @@ type IndexManifest struct {
|
||||
Manifests []Descriptor `json:"manifests"`
|
||||
Annotations map[string]string `json:"annotations,omitempty"`
|
||||
Subject *Descriptor `json:"subject,omitempty"`
|
||||
ArtifactType string `json:"artifactType,omitempty"`
|
||||
}
|
||||
|
||||
// Descriptor holds a reference from the manifest to one of its constituent elements.
|
||||
|
||||
+87
-54
@@ -52,6 +52,16 @@ func (i *image) MediaType() (types.MediaType, error) {
|
||||
return i.base.MediaType()
|
||||
}
|
||||
|
||||
// isImageConfig reports whether the media type is a Docker or OCI image config.
|
||||
func isImageConfig(mt types.MediaType) bool {
|
||||
switch mt {
|
||||
case types.DockerConfigJSON, types.OCIConfigJSON:
|
||||
return true
|
||||
default:
|
||||
return false
|
||||
}
|
||||
}
|
||||
|
||||
func (i *image) compute() error {
|
||||
i.Lock()
|
||||
defer i.Unlock()
|
||||
@@ -60,6 +70,24 @@ func (i *image) compute() error {
|
||||
if i.computed {
|
||||
return nil
|
||||
}
|
||||
|
||||
m, err := i.base.Manifest()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
manifest := m.DeepCopy()
|
||||
|
||||
diffIDMap := make(map[v1.Hash]v1.Layer)
|
||||
digestMap := make(map[v1.Hash]v1.Layer)
|
||||
|
||||
// Determine effective config media type (user override takes precedence).
|
||||
cfgMediaType := manifest.Config.MediaType
|
||||
if i.configMediaType != nil {
|
||||
cfgMediaType = *i.configMediaType
|
||||
}
|
||||
|
||||
imageConfig := isImageConfig(cfgMediaType)
|
||||
|
||||
var configFile *v1.ConfigFile
|
||||
if i.configFile != nil {
|
||||
configFile = i.configFile
|
||||
@@ -70,33 +98,32 @@ func (i *image) compute() error {
|
||||
}
|
||||
configFile = cf.DeepCopy()
|
||||
}
|
||||
diffIDs := configFile.RootFS.DiffIDs
|
||||
history := configFile.History
|
||||
|
||||
diffIDMap := make(map[v1.Hash]v1.Layer)
|
||||
digestMap := make(map[v1.Hash]v1.Layer)
|
||||
// For image configs, update RootFS.DiffIDs and History from added layers.
|
||||
// For artifacts, skip this: the config has no rootfs or history fields.
|
||||
if imageConfig {
|
||||
diffIDs := configFile.RootFS.DiffIDs
|
||||
history := configFile.History
|
||||
|
||||
for _, add := range i.adds {
|
||||
history = append(history, add.History)
|
||||
if add.Layer != nil {
|
||||
diffID, err := add.Layer.DiffID()
|
||||
if err != nil {
|
||||
return err
|
||||
for _, add := range i.adds {
|
||||
history = append(history, add.History)
|
||||
if add.Layer != nil {
|
||||
diffID, err := add.Layer.DiffID()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
diffIDs = append(diffIDs, diffID)
|
||||
diffIDMap[diffID] = add.Layer
|
||||
}
|
||||
diffIDs = append(diffIDs, diffID)
|
||||
diffIDMap[diffID] = add.Layer
|
||||
}
|
||||
|
||||
configFile.RootFS.DiffIDs = diffIDs
|
||||
configFile.History = history
|
||||
}
|
||||
|
||||
m, err := i.base.Manifest()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
manifest := m.DeepCopy()
|
||||
manifestLayers := manifest.Layers
|
||||
for _, add := range i.adds {
|
||||
if add.Layer == nil {
|
||||
// Empty layers include only history in manifest.
|
||||
continue
|
||||
}
|
||||
|
||||
@@ -105,14 +132,12 @@ func (i *image) compute() error {
|
||||
return err
|
||||
}
|
||||
|
||||
// Fields in the addendum override the original descriptor.
|
||||
if len(add.Annotations) != 0 {
|
||||
desc.Annotations = add.Annotations
|
||||
}
|
||||
if len(add.URLs) != 0 {
|
||||
desc.URLs = add.URLs
|
||||
}
|
||||
|
||||
if add.MediaType != "" {
|
||||
desc.MediaType = add.MediaType
|
||||
}
|
||||
@@ -120,42 +145,38 @@ func (i *image) compute() error {
|
||||
manifestLayers = append(manifestLayers, *desc)
|
||||
digestMap[desc.Digest] = add.Layer
|
||||
}
|
||||
|
||||
configFile.RootFS.DiffIDs = diffIDs
|
||||
configFile.History = history
|
||||
|
||||
manifest.Layers = manifestLayers
|
||||
|
||||
rcfg, err := json.Marshal(configFile)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
d, sz, err := v1.SHA256(bytes.NewBuffer(rcfg))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
manifest.Config.Digest = d
|
||||
manifest.Config.Size = sz
|
||||
// For image configs, re-marshal the config and update the manifest digest.
|
||||
// For artifacts, preserve the original config blob as-is to avoid
|
||||
// corrupting the digest via re-marshaling.
|
||||
if imageConfig {
|
||||
rcfg, err := json.Marshal(configFile)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
d, sz, err := v1.SHA256(bytes.NewBuffer(rcfg))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
manifest.Config.Digest = d
|
||||
manifest.Config.Size = sz
|
||||
|
||||
// If Data was set in the base image, we need to update it in the mutated image.
|
||||
if m.Config.Data != nil {
|
||||
manifest.Config.Data = rcfg
|
||||
if m.Config.Data != nil {
|
||||
manifest.Config.Data = rcfg
|
||||
}
|
||||
}
|
||||
|
||||
// If the user wants to mutate the media type of the config
|
||||
if i.configMediaType != nil {
|
||||
manifest.Config.MediaType = *i.configMediaType
|
||||
}
|
||||
|
||||
if i.mediaType != nil {
|
||||
manifest.MediaType = *i.mediaType
|
||||
}
|
||||
|
||||
if i.annotations != nil {
|
||||
if manifest.Annotations == nil {
|
||||
manifest.Annotations = map[string]string{}
|
||||
}
|
||||
|
||||
for k, v := range i.annotations {
|
||||
manifest.Annotations[k] = v
|
||||
}
|
||||
@@ -173,29 +194,34 @@ func (i *image) compute() error {
|
||||
// Layers returns the ordered collection of filesystem layers that comprise this image.
|
||||
// The order of the list is oldest/base layer first, and most-recent/top layer last.
|
||||
func (i *image) Layers() ([]v1.Layer, error) {
|
||||
if err := i.compute(); errors.Is(err, stream.ErrNotComputed) {
|
||||
// Image contains a streamable layer which has not yet been
|
||||
// consumed. Just return the layers we have in case the caller
|
||||
// is going to consume the layers.
|
||||
if err := i.compute(); errors.Is(err, stream.ErrNotComputed) || (i.manifest != nil && !isImageConfig(i.manifest.Config.MediaType)) {
|
||||
// Stream not yet consumed, or non-image OCI artifact (RootFS.DiffIDs
|
||||
// is empty so partial.DiffIDs returns nothing). Fall back to the base
|
||||
// layers plus any added layers.
|
||||
layers, err := i.base.Layers()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
for _, add := range i.adds {
|
||||
layers = append(layers, add.Layer)
|
||||
if add.Layer != nil {
|
||||
layers = append(layers, add.Layer)
|
||||
}
|
||||
}
|
||||
return layers, nil
|
||||
} else if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
diffIDs, err := partial.DiffIDs(i)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
ls := make([]v1.Layer, 0, len(diffIDs))
|
||||
for _, h := range diffIDs {
|
||||
l, err := i.LayerByDiffID(h)
|
||||
// Walk manifest layer descriptors by digest rather than rootfs diff
|
||||
// IDs. Two layers can legitimately share a diff ID — same uncompressed
|
||||
// content, different compression — and produce distinct digests. The
|
||||
// manifest preserves the per-occurrence digest; LayerByDiffID does not,
|
||||
// which previously caused duplicate-diff-ID layers to collapse to a
|
||||
// single entry in the returned slice and break blob upload for
|
||||
// downstream pushers (see #2034).
|
||||
ls := make([]v1.Layer, 0, len(i.manifest.Layers))
|
||||
for _, desc := range i.manifest.Layers {
|
||||
l, err := i.LayerByDigest(desc.Digest)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
@@ -220,11 +246,18 @@ func (i *image) ConfigFile() (*v1.ConfigFile, error) {
|
||||
return i.configFile.DeepCopy(), nil
|
||||
}
|
||||
|
||||
// RawConfigFile returns the serialized bytes of ConfigFile()
|
||||
// RawConfigFile returns the serialized bytes of ConfigFile().
|
||||
// For non-image OCI artifacts, returns the original raw config to preserve
|
||||
// the config blob digest.
|
||||
func (i *image) RawConfigFile() ([]byte, error) {
|
||||
if err := i.compute(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
// If the manifest config is not a standard image config, return the
|
||||
// original raw bytes to avoid corrupting the digest via re-marshaling.
|
||||
if i.manifest != nil && !isImageConfig(i.manifest.Config.MediaType) {
|
||||
return i.base.RawConfigFile()
|
||||
}
|
||||
return json.Marshal(i.configFile)
|
||||
}
|
||||
|
||||
|
||||
+73
-72
@@ -277,90 +277,91 @@ func extract(img v1.Image, w io.Writer) error {
|
||||
// whiteout layers more efficient, since we can just keep track of the removed
|
||||
// files as we see .wh. layers and ignore those in previous layers.
|
||||
for i := len(layers) - 1; i >= 0; i-- {
|
||||
layer := layers[i]
|
||||
layerReader, err := layer.Uncompressed()
|
||||
if err != nil {
|
||||
return fmt.Errorf("reading layer contents: %w", err)
|
||||
if err := extractLayer(tarWriter, fileMap, layers[i]); err != nil {
|
||||
return err
|
||||
}
|
||||
defer layerReader.Close()
|
||||
tarReader := tar.NewReader(layerReader)
|
||||
for {
|
||||
header, err := tarReader.Next()
|
||||
if errors.Is(err, io.EOF) {
|
||||
break
|
||||
}
|
||||
if err != nil {
|
||||
return fmt.Errorf("reading tar: %w", err)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// Some tools prepend everything with "./", so if we don't Clean the
|
||||
// name, we may have duplicate entries, which angers tar-split.
|
||||
header.Name = filepath.Clean(header.Name)
|
||||
func extractLayer(tarWriter *tar.Writer, fileMap map[string]bool, layer v1.Layer) error {
|
||||
layerReader, err := layer.Uncompressed()
|
||||
if err != nil {
|
||||
return fmt.Errorf("reading layer contents: %w", err)
|
||||
}
|
||||
defer layerReader.Close()
|
||||
|
||||
// Normalize absolute paths to relative to prevent writing outside
|
||||
// the extraction root (Zip Slip / CVE-2018-15664 class).
|
||||
// Many OCI tools emit absolute paths; stripping the leading slash
|
||||
// preserves the entry while removing the danger.
|
||||
if filepath.IsAbs(header.Name) {
|
||||
header.Name = strings.TrimLeft(header.Name, "/")
|
||||
}
|
||||
// After normalization, reject any remaining path traversal.
|
||||
if strings.HasPrefix(header.Name, "..") {
|
||||
continue
|
||||
}
|
||||
tarReader := tar.NewReader(layerReader)
|
||||
for {
|
||||
header, err := tarReader.Next()
|
||||
if errors.Is(err, io.EOF) {
|
||||
break
|
||||
}
|
||||
if err != nil {
|
||||
return fmt.Errorf("reading tar: %w", err)
|
||||
}
|
||||
|
||||
// Reject symlinks and hardlinks that point outside the extraction
|
||||
// root. An attacker can create a symlink to /etc and then write
|
||||
// files through it in a subsequent layer entry.
|
||||
if header.Typeflag == tar.TypeSymlink || header.Typeflag == tar.TypeLink {
|
||||
linkTarget := filepath.Clean(header.Linkname)
|
||||
if strings.HasPrefix(linkTarget, "..") || filepath.IsAbs(linkTarget) {
|
||||
// Some tools prepend everything with "./", so if we don't Clean the
|
||||
// name, we may have duplicate entries, which angers tar-split.
|
||||
header.Name = filepath.Clean(header.Name)
|
||||
|
||||
// Reject relative symlinks and hardlinks whose targets escape the
|
||||
// image rootfs. Relative targets are resolved against the symlink's
|
||||
// own directory: if the clean result starts with ".." the link would
|
||||
// leave the rootfs. Relative symlinks that stay within the rootfs
|
||||
// (common for glibc, C toolchains, etc.) are preserved unchanged.
|
||||
// Absolute targets are left as-is; see #2238 for ongoing discussion
|
||||
// on whether they should be pruned.
|
||||
if header.Typeflag == tar.TypeSymlink || header.Typeflag == tar.TypeLink {
|
||||
if !filepath.IsAbs(header.Linkname) {
|
||||
resolved := filepath.Clean(filepath.Join(filepath.Dir(header.Name), header.Linkname)) //nolint:gosec // G305: path is only used for validation, not file I/O
|
||||
if strings.HasPrefix(resolved, "..") {
|
||||
continue
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// force PAX format to remove Name/Linkname length limit of 100 characters
|
||||
// required by USTAR and to not depend on internal tar package guess which
|
||||
// prefers USTAR over PAX
|
||||
header.Format = tar.FormatPAX
|
||||
// force PAX format to remove Name/Linkname length limit of 100 characters
|
||||
// required by USTAR and to not depend on internal tar package guess which
|
||||
// prefers USTAR over PAX
|
||||
header.Format = tar.FormatPAX
|
||||
|
||||
basename := filepath.Base(header.Name)
|
||||
dirname := filepath.Dir(header.Name)
|
||||
tombstone := strings.HasPrefix(basename, whiteoutPrefix)
|
||||
if tombstone {
|
||||
basename = basename[len(whiteoutPrefix):]
|
||||
basename := filepath.Base(header.Name)
|
||||
dirname := filepath.Dir(header.Name)
|
||||
tombstone := strings.HasPrefix(basename, whiteoutPrefix)
|
||||
if tombstone {
|
||||
basename = basename[len(whiteoutPrefix):]
|
||||
}
|
||||
|
||||
// check if we have seen value before
|
||||
// if we're checking a directory, don't filepath.Join names
|
||||
var name string
|
||||
if header.Typeflag == tar.TypeDir {
|
||||
name = header.Name
|
||||
} else {
|
||||
name = filepath.Join(dirname, basename)
|
||||
}
|
||||
|
||||
if _, ok := fileMap[name]; ok && !tombstone {
|
||||
continue
|
||||
}
|
||||
|
||||
// check for a whited out parent directory
|
||||
if inWhiteoutDir(fileMap, name) {
|
||||
continue
|
||||
}
|
||||
|
||||
// mark file as handled. non-directory implicitly tombstones
|
||||
// any entries with a matching (or child) name
|
||||
fileMap[name] = tombstone || (header.Typeflag != tar.TypeDir)
|
||||
if !tombstone {
|
||||
if err := tarWriter.WriteHeader(header); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// check if we have seen value before
|
||||
// if we're checking a directory, don't filepath.Join names
|
||||
var name string
|
||||
if header.Typeflag == tar.TypeDir {
|
||||
name = header.Name
|
||||
} else {
|
||||
name = filepath.Join(dirname, basename)
|
||||
}
|
||||
|
||||
if _, ok := fileMap[name]; ok && !tombstone {
|
||||
continue
|
||||
}
|
||||
|
||||
// check for a whited out parent directory
|
||||
if inWhiteoutDir(fileMap, name) {
|
||||
continue
|
||||
}
|
||||
|
||||
// mark file as handled. non-directory implicitly tombstones
|
||||
// any entries with a matching (or child) name
|
||||
fileMap[name] = tombstone || (header.Typeflag != tar.TypeDir)
|
||||
if !tombstone {
|
||||
if err := tarWriter.WriteHeader(header); err != nil {
|
||||
if header.Size > 0 {
|
||||
if _, err := io.CopyN(tarWriter, tarReader, header.Size); err != nil {
|
||||
return err
|
||||
}
|
||||
if header.Size > 0 {
|
||||
if _, err := io.CopyN(tarWriter, tarReader, header.Size); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
+10
-3
@@ -337,8 +337,12 @@ func Descriptor(d Describable) (*v1.Descriptor, error) {
|
||||
mf, _ := Manifest(wrm)
|
||||
// Failing to parse as a manifest should just be ignored.
|
||||
// The manifest might not be valid, and that's okay.
|
||||
if mf != nil && !mf.Config.MediaType.IsConfig() {
|
||||
desc.ArtifactType = string(mf.Config.MediaType)
|
||||
if mf != nil {
|
||||
if mf.ArtifactType != "" {
|
||||
desc.ArtifactType = mf.ArtifactType
|
||||
} else {
|
||||
desc.ArtifactType = string(mf.Config.MediaType)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -429,7 +433,10 @@ func ArtifactType(w WithManifest) (string, error) {
|
||||
mf, _ := w.Manifest()
|
||||
// Failing to parse as a manifest should just be ignored.
|
||||
// The manifest might not be valid, and that's okay.
|
||||
if mf != nil && !mf.Config.MediaType.IsConfig() {
|
||||
if mf != nil {
|
||||
if mf.ArtifactType != "" {
|
||||
return mf.ArtifactType, nil
|
||||
}
|
||||
return string(mf.Config.MediaType), nil
|
||||
}
|
||||
return "", nil
|
||||
|
||||
+122
-6
@@ -19,6 +19,7 @@ import (
|
||||
"context"
|
||||
"fmt"
|
||||
"io"
|
||||
"net"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"strings"
|
||||
@@ -40,8 +41,9 @@ const (
|
||||
|
||||
// fetcher implements methods for reading from a registry.
|
||||
type fetcher struct {
|
||||
target resource
|
||||
client *http.Client
|
||||
target resource
|
||||
client *http.Client
|
||||
limiter *pullLimiter
|
||||
}
|
||||
|
||||
func makeFetcher(ctx context.Context, target resource, o *options) (*fetcher, error) {
|
||||
@@ -69,10 +71,40 @@ func makeFetcher(ctx context.Context, target resource, o *options) (*fetcher, er
|
||||
}
|
||||
return &fetcher{
|
||||
target: target,
|
||||
client: &http.Client{Transport: tr},
|
||||
client: &http.Client{
|
||||
Transport: tr,
|
||||
CheckRedirect: checkRedirectSSRF,
|
||||
},
|
||||
limiter: o.limiter,
|
||||
}, nil
|
||||
}
|
||||
|
||||
// checkRedirectSSRF rejects HTTP redirects that cross from a public host to a
|
||||
// private or link-local IP literal. This prevents a malicious registry from
|
||||
// issuing a 302 to a cloud instance metadata service (e.g. 169.254.169.254)
|
||||
// or another internal network address during blob or manifest downloads.
|
||||
//
|
||||
// Same-host redirects and redirects to non-IP hostnames (including DNS names
|
||||
// that may resolve to private addresses) are allowed. The first redirect in
|
||||
// the chain uses the original request URL as the "origin host" via
|
||||
// req.Response.Request, falling back to req.URL when no prior response exists.
|
||||
func checkRedirectSSRF(req *http.Request, via []*http.Request) error {
|
||||
if len(via) == 0 || req.Response == nil {
|
||||
return nil
|
||||
}
|
||||
origHost := via[0].URL.Hostname()
|
||||
destHost := req.URL.Hostname()
|
||||
if destHost == origHost {
|
||||
return nil // same-host redirect is always allowed
|
||||
}
|
||||
if ip := net.ParseIP(destHost); ip != nil {
|
||||
if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() || ip.IsPrivate() || ip.IsUnspecified() {
|
||||
return fmt.Errorf("SSRF protection: redirect from %q to private/link-local host %q denied", origHost, destHost)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (f *fetcher) Do(req *http.Request) (*http.Response, error) {
|
||||
return f.client.Do(req)
|
||||
}
|
||||
@@ -162,11 +194,20 @@ func (f *fetcher) fetchManifest(ctx context.Context, ref name.Reference, accepta
|
||||
}
|
||||
|
||||
var artifactType string
|
||||
var annotations map[string]string
|
||||
mf, _ := v1.ParseManifest(bytes.NewReader(manifest))
|
||||
// Failing to parse as a manifest should just be ignored.
|
||||
// The manifest might not be valid, and that's okay.
|
||||
if mf != nil && !mf.Config.MediaType.IsConfig() {
|
||||
artifactType = string(mf.Config.MediaType)
|
||||
if mf != nil {
|
||||
// Per the OCI distribution spec, artifactType on the descriptor is
|
||||
// set to the manifest's artifactType if present, otherwise it falls
|
||||
// back to the config descriptor's mediaType.
|
||||
if mf.ArtifactType != "" {
|
||||
artifactType = mf.ArtifactType
|
||||
} else {
|
||||
artifactType = string(mf.Config.MediaType)
|
||||
}
|
||||
annotations = mf.Annotations
|
||||
}
|
||||
|
||||
// Do nothing for tags; I give up.
|
||||
@@ -183,6 +224,7 @@ func (f *fetcher) fetchManifest(ctx context.Context, ref name.Reference, accepta
|
||||
Size: size,
|
||||
MediaType: mediaType,
|
||||
ArtifactType: artifactType,
|
||||
Annotations: annotations,
|
||||
}
|
||||
|
||||
return manifest, &desc, nil
|
||||
@@ -247,18 +289,30 @@ func (f *fetcher) headManifest(ctx context.Context, ref name.Reference, acceptab
|
||||
|
||||
func (f *fetcher) fetchBlob(ctx context.Context, size int64, h v1.Hash) (io.ReadCloser, error) {
|
||||
u := f.url("blobs", h.String())
|
||||
return f.fetchBlobURL(ctx, u, size, h)
|
||||
}
|
||||
|
||||
func (f *fetcher) fetchBlobURL(ctx context.Context, u url.URL, size int64, h v1.Hash) (io.ReadCloser, error) {
|
||||
release, err := f.limiter.acquire(ctx)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
req, err := http.NewRequest(http.MethodGet, u.String(), nil)
|
||||
if err != nil {
|
||||
release()
|
||||
return nil, err
|
||||
}
|
||||
|
||||
resp, err := f.client.Do(req.WithContext(ctx))
|
||||
if err != nil {
|
||||
release()
|
||||
return nil, redact.Error(err)
|
||||
}
|
||||
|
||||
if err := transport.CheckError(resp, http.StatusOK); err != nil {
|
||||
resp.Body.Close()
|
||||
release()
|
||||
return nil, err
|
||||
}
|
||||
|
||||
@@ -269,11 +323,22 @@ func (f *fetcher) fetchBlob(ctx context.Context, size int64, h v1.Hash) (io.Read
|
||||
if size == verify.SizeUnknown {
|
||||
size = hsize
|
||||
} else if hsize != size {
|
||||
resp.Body.Close()
|
||||
release()
|
||||
return nil, fmt.Errorf("GET %s: Content-Length header %d does not match expected size %d", u.String(), hsize, size)
|
||||
}
|
||||
}
|
||||
|
||||
return verify.ReadCloser(resp.Body, size, h)
|
||||
rc, err := verify.ReadCloser(resp.Body, size, h)
|
||||
if err != nil {
|
||||
resp.Body.Close()
|
||||
release()
|
||||
return nil, err
|
||||
}
|
||||
return &limitedReadCloser{
|
||||
ReadCloser: rc,
|
||||
release: release,
|
||||
}, nil
|
||||
}
|
||||
|
||||
func (f *fetcher) headBlob(ctx context.Context, h v1.Hash) (*http.Response, error) {
|
||||
@@ -296,6 +361,57 @@ func (f *fetcher) headBlob(ctx context.Context, h v1.Hash) (*http.Response, erro
|
||||
return resp, nil
|
||||
}
|
||||
|
||||
// validateForeignURL rejects foreign layer URLs that use a disallowed scheme
|
||||
// or resolve to a private / link-local IP address (SSRF protection). DNS-based
|
||||
// SSRF is out of scope, matching transport.validateRealmURL.
|
||||
func validateForeignURL(rawURL string, insecure bool) error {
|
||||
u, err := url.Parse(rawURL)
|
||||
if err != nil {
|
||||
return fmt.Errorf("parsing foreign layer URL %q: %w", rawURL, err)
|
||||
}
|
||||
switch u.Scheme {
|
||||
case "https":
|
||||
case "http":
|
||||
if !insecure {
|
||||
return fmt.Errorf("foreign layer URL scheme %q not allowed for a secure registry; use https", u.Scheme)
|
||||
}
|
||||
default:
|
||||
return fmt.Errorf("foreign layer URL scheme %q not allowed; must be https (or http for insecure registries)", u.Scheme)
|
||||
}
|
||||
host := u.Hostname()
|
||||
if ip := net.ParseIP(host); ip != nil {
|
||||
if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() || ip.IsPrivate() || ip.IsUnspecified() {
|
||||
return fmt.Errorf("foreign layer URL host %q is a private or link-local address", host)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// fetchForeignBlobURL fetches a foreign-layer blob, validating every redirect
|
||||
// destination through validateForeignURL (SSRF protection).
|
||||
func (f *fetcher) fetchForeignBlobURL(ctx context.Context, u url.URL, size int64, h v1.Hash, insecure bool) (io.ReadCloser, error) {
|
||||
safeClient := &http.Client{
|
||||
Transport: f.client.Transport,
|
||||
CheckRedirect: func(req *http.Request, _ []*http.Request) error {
|
||||
return validateForeignURL(req.URL.String(), insecure)
|
||||
},
|
||||
}
|
||||
|
||||
req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
resp, err := safeClient.Do(req)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if resp.StatusCode != http.StatusOK {
|
||||
resp.Body.Close()
|
||||
return nil, fmt.Errorf("GET %s: unexpected status %s", u.String(), resp.Status)
|
||||
}
|
||||
return verify.ReadCloser(resp.Body, size, h)
|
||||
}
|
||||
|
||||
func (f *fetcher) blobExists(ctx context.Context, h v1.Hash) (bool, error) {
|
||||
u := f.url("blobs", h.String())
|
||||
req, err := http.NewRequest(http.MethodHead, u.String(), nil)
|
||||
|
||||
+19
-21
@@ -18,7 +18,6 @@ import (
|
||||
"bytes"
|
||||
"context"
|
||||
"io"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"sync"
|
||||
|
||||
@@ -27,7 +26,6 @@ import (
|
||||
"github.com/google/go-containerregistry/pkg/name"
|
||||
v1 "github.com/google/go-containerregistry/pkg/v1"
|
||||
"github.com/google/go-containerregistry/pkg/v1/partial"
|
||||
"github.com/google/go-containerregistry/pkg/v1/remote/transport"
|
||||
"github.com/google/go-containerregistry/pkg/v1/types"
|
||||
)
|
||||
|
||||
@@ -172,7 +170,7 @@ func (rl *remoteImageLayer) Digest() (v1.Hash, error) {
|
||||
|
||||
// Compressed implements partial.CompressedLayer
|
||||
func (rl *remoteImageLayer) Compressed() (io.ReadCloser, error) {
|
||||
urls := []url.URL{rl.ri.fetcher.url("blobs", rl.digest.String())}
|
||||
u := rl.ri.fetcher.url("blobs", rl.digest.String())
|
||||
|
||||
// Add alternative layer sources from URLs (usually none).
|
||||
d, err := partial.BlobDescriptor(rl, rl.digest)
|
||||
@@ -187,38 +185,38 @@ func (rl *remoteImageLayer) Compressed() (io.ReadCloser, error) {
|
||||
// We don't want to log binary layers -- this can break terminals.
|
||||
ctx := redact.NewContext(rl.ctx, "omitting binary blobs from logs")
|
||||
|
||||
for _, s := range d.URLs {
|
||||
u, err := url.Parse(s)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
urls = append(urls, *u)
|
||||
}
|
||||
insecure := rl.ri.fetcher.target.Scheme() == "http"
|
||||
|
||||
// The lastErr for most pulls will be the same (the first error), but for
|
||||
// foreign layers we'll want to surface the last one, since we try to pull
|
||||
// from the registry first, which would often fail.
|
||||
// TODO: Maybe we don't want to try pulling from the registry first?
|
||||
var lastErr error
|
||||
for _, u := range urls {
|
||||
req, err := http.NewRequest(http.MethodGet, u.String(), nil)
|
||||
rc, err := rl.ri.fetcher.fetchBlobURL(ctx, u, d.Size, rl.digest)
|
||||
if err == nil {
|
||||
return rc, nil
|
||||
}
|
||||
lastErr = err
|
||||
|
||||
foreignURLs := make([]url.URL, 0, len(d.URLs))
|
||||
for _, s := range d.URLs {
|
||||
if err := validateForeignURL(s, insecure); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
fu, err := url.Parse(s)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
foreignURLs = append(foreignURLs, *fu)
|
||||
}
|
||||
|
||||
resp, err := rl.ri.fetcher.Do(req.WithContext(ctx))
|
||||
for _, fu := range foreignURLs {
|
||||
rc, err := rl.ri.fetcher.fetchForeignBlobURL(ctx, fu, d.Size, rl.digest, insecure)
|
||||
if err != nil {
|
||||
lastErr = err
|
||||
continue
|
||||
}
|
||||
|
||||
if err := transport.CheckError(resp, http.StatusOK); err != nil {
|
||||
resp.Body.Close()
|
||||
lastErr = err
|
||||
continue
|
||||
}
|
||||
|
||||
return verify.ReadCloser(resp.Body, d.Size, rl.digest)
|
||||
return rc, nil
|
||||
}
|
||||
|
||||
return nil, lastErr
|
||||
|
||||
+6
-2
@@ -225,8 +225,12 @@ func (r *remoteIndex) childDescriptor(child v1.Descriptor, platform v1.Platform)
|
||||
mf, _ := v1.ParseManifest(bytes.NewReader(manifest))
|
||||
// Failing to parse as a manifest should just be ignored.
|
||||
// The manifest might not be valid, and that's okay.
|
||||
if mf != nil && !mf.Config.MediaType.IsConfig() {
|
||||
child.ArtifactType = string(mf.Config.MediaType)
|
||||
if mf != nil {
|
||||
if mf.ArtifactType != "" {
|
||||
child.ArtifactType = mf.ArtifactType
|
||||
} else {
|
||||
child.ArtifactType = string(mf.Config.MediaType)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Generated
Vendored
+182
@@ -0,0 +1,182 @@
|
||||
// Copyright 2014 Docker, Inc.
|
||||
// Copyright 2021-2026 The Distribution contributors
|
||||
// Copyright 2026 Google LLC All Rights Reserved.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package authchallenge
|
||||
|
||||
import (
|
||||
"net/http"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// Octet types from RFC 2616.
|
||||
type octetType byte
|
||||
|
||||
var octetTypes [256]octetType
|
||||
|
||||
const (
|
||||
isToken octetType = 1 << iota
|
||||
isSpace
|
||||
)
|
||||
|
||||
func init() {
|
||||
// OCTET = <any 8-bit sequence of data>
|
||||
// CHAR = <any US-ASCII character (octets 0 - 127)>
|
||||
// CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
|
||||
// CR = <US-ASCII CR, carriage return (13)>
|
||||
// LF = <US-ASCII LF, linefeed (10)>
|
||||
// SP = <US-ASCII SP, space (32)>
|
||||
// HT = <US-ASCII HT, horizontal-tab (9)>
|
||||
// <"> = <US-ASCII double-quote mark (34)>
|
||||
// CRLF = CR LF
|
||||
// LWS = [CRLF] 1*( SP | HT )
|
||||
// TEXT = <any OCTET except CTLs, but including LWS>
|
||||
// separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\" | <">
|
||||
// | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP | HT
|
||||
// token = 1*<any CHAR except CTLs or separators>
|
||||
// qdtext = <any TEXT except <">>
|
||||
|
||||
for c := range 256 {
|
||||
var t octetType
|
||||
isCtl := c <= 31 || c == 127
|
||||
isChar := 0 <= c && c <= 127
|
||||
isSeparator := strings.ContainsRune(" \t\"(),/:;<=>?@[]\\{}", rune(c))
|
||||
if strings.ContainsRune(" \t\r\n", rune(c)) {
|
||||
t |= isSpace
|
||||
}
|
||||
if isChar && !isCtl && !isSeparator {
|
||||
t |= isToken
|
||||
}
|
||||
octetTypes[c] = t
|
||||
}
|
||||
}
|
||||
|
||||
// Challenge carries information from a WWW-Authenticate response header.
|
||||
// See RFC 2617.
|
||||
type Challenge struct {
|
||||
// Scheme is the auth-scheme according to RFC 2617
|
||||
Scheme string
|
||||
|
||||
// Parameters are the auth-params according to RFC 2617
|
||||
Parameters map[string]string
|
||||
}
|
||||
|
||||
// ResponseChallenges returns a list of authorization challenges
|
||||
// for the given http Response. Challenges are only checked if
|
||||
// the response status code was a 401.
|
||||
func ResponseChallenges(resp *http.Response) []Challenge {
|
||||
if resp.StatusCode == http.StatusUnauthorized {
|
||||
// Parse the WWW-Authenticate Header and store the challenges
|
||||
// on this endpoint object.
|
||||
return parseAuthHeader(resp.Header)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func parseAuthHeader(header http.Header) []Challenge {
|
||||
challenges := []Challenge{}
|
||||
for _, h := range header[http.CanonicalHeaderKey("WWW-Authenticate")] {
|
||||
v, p := parseValueAndParams(h)
|
||||
if v != "" {
|
||||
challenges = append(challenges, Challenge{Scheme: v, Parameters: p})
|
||||
}
|
||||
}
|
||||
return challenges
|
||||
}
|
||||
|
||||
func parseValueAndParams(header string) (value string, params map[string]string) {
|
||||
params = make(map[string]string)
|
||||
value, s := expectToken(header)
|
||||
if value == "" {
|
||||
return
|
||||
}
|
||||
value = strings.ToLower(value)
|
||||
s = "," + skipSpace(s)
|
||||
for strings.HasPrefix(s, ",") {
|
||||
var pkey string
|
||||
pkey, s = expectToken(skipSpace(s[1:]))
|
||||
if pkey == "" {
|
||||
return
|
||||
}
|
||||
if !strings.HasPrefix(s, "=") {
|
||||
return
|
||||
}
|
||||
var pvalue string
|
||||
pvalue, s = expectTokenOrQuoted(s[1:])
|
||||
if pvalue == "" {
|
||||
return
|
||||
}
|
||||
pkey = strings.ToLower(pkey)
|
||||
params[pkey] = pvalue
|
||||
s = skipSpace(s)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func skipSpace(s string) (rest string) {
|
||||
i := 0
|
||||
for ; i < len(s); i++ {
|
||||
if octetTypes[s[i]]&isSpace == 0 {
|
||||
break
|
||||
}
|
||||
}
|
||||
return s[i:]
|
||||
}
|
||||
|
||||
func expectToken(s string) (token, rest string) {
|
||||
i := 0
|
||||
for ; i < len(s); i++ {
|
||||
if octetTypes[s[i]]&isToken == 0 {
|
||||
break
|
||||
}
|
||||
}
|
||||
return s[:i], s[i:]
|
||||
}
|
||||
|
||||
func expectTokenOrQuoted(s string) (value string, rest string) {
|
||||
if !strings.HasPrefix(s, "\"") {
|
||||
return expectToken(s)
|
||||
}
|
||||
s = s[1:]
|
||||
for i := 0; i < len(s); i++ {
|
||||
switch s[i] {
|
||||
case '"':
|
||||
return s[:i], s[i+1:]
|
||||
case '\\':
|
||||
p := make([]byte, len(s)-1)
|
||||
j := copy(p, s[:i])
|
||||
escape := true
|
||||
for i = i + 1; i < len(s); i++ {
|
||||
b := s[i]
|
||||
switch {
|
||||
case escape:
|
||||
escape = false
|
||||
p[j] = b
|
||||
j++
|
||||
case b == '\\':
|
||||
escape = true
|
||||
case b == '"':
|
||||
return string(p[:j]), s[i+1:]
|
||||
default:
|
||||
p[j] = b
|
||||
j++
|
||||
}
|
||||
}
|
||||
return "", ""
|
||||
}
|
||||
}
|
||||
return "", ""
|
||||
}
|
||||
+55
@@ -0,0 +1,55 @@
|
||||
// Copyright 2026 Google LLC All Rights Reserved.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package remote
|
||||
|
||||
import (
|
||||
"context"
|
||||
"io"
|
||||
"sync"
|
||||
)
|
||||
|
||||
type pullLimiter struct {
|
||||
tokens chan struct{}
|
||||
}
|
||||
|
||||
func newPullLimiter(jobs int) *pullLimiter {
|
||||
return &pullLimiter{
|
||||
tokens: make(chan struct{}, jobs),
|
||||
}
|
||||
}
|
||||
|
||||
func (l *pullLimiter) acquire(ctx context.Context) (func(), error) {
|
||||
if l == nil {
|
||||
return func() {}, nil
|
||||
}
|
||||
select {
|
||||
case l.tokens <- struct{}{}:
|
||||
return func() { <-l.tokens }, nil
|
||||
case <-ctx.Done():
|
||||
return nil, ctx.Err()
|
||||
}
|
||||
}
|
||||
|
||||
type limitedReadCloser struct {
|
||||
io.ReadCloser
|
||||
release func()
|
||||
once sync.Once
|
||||
}
|
||||
|
||||
func (l *limitedReadCloser) Close() error {
|
||||
err := l.ReadCloser.Close()
|
||||
l.once.Do(l.release)
|
||||
return err
|
||||
}
|
||||
+3
@@ -45,6 +45,7 @@ type options struct {
|
||||
retryBackoff Backoff
|
||||
retryPredicate retry.Predicate
|
||||
retryStatusCodes []int
|
||||
limiter *pullLimiter
|
||||
|
||||
// Only these options can overwrite Reuse()d options.
|
||||
platform v1.Platform
|
||||
@@ -92,6 +93,7 @@ var fastBackoff = Backoff{
|
||||
|
||||
var defaultRetryStatusCodes = []int{
|
||||
http.StatusRequestTimeout,
|
||||
http.StatusTooManyRequests, // 429: OCI distribution-spec rate limit; TooManyRequestsErrorCode is already classified temporary in transport/error.go
|
||||
http.StatusInternalServerError,
|
||||
http.StatusBadGateway,
|
||||
http.StatusServiceUnavailable,
|
||||
@@ -142,6 +144,7 @@ func makeOptions(opts ...Option) (*options, error) {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
o.limiter = newPullLimiter(o.jobs)
|
||||
|
||||
switch {
|
||||
case o.auth != nil && o.keychain != nil:
|
||||
|
||||
+6
-2
@@ -156,7 +156,11 @@ func (p *Pusher) Upload(ctx context.Context, repo name.Repository, l v1.Layer) e
|
||||
}
|
||||
|
||||
func (p *Pusher) Delete(ctx context.Context, ref name.Reference) error {
|
||||
w, err := p.writer(ctx, ref.Context(), p.o)
|
||||
// Use a transport scoped for delete. Requesting DeleteScope (which
|
||||
// includes the "delete" action) allows registries that require an
|
||||
// explicit delete permission—such as IBM Cloud Container Registry—to
|
||||
// grant access.
|
||||
client, err := makeDeleteClient(ctx, ref.Context(), p.o)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
@@ -172,7 +176,7 @@ func (p *Pusher) Delete(ctx context.Context, ref name.Reference) error {
|
||||
return err
|
||||
}
|
||||
|
||||
resp, err := w.w.client.Do(req.WithContext(ctx))
|
||||
resp, err := client.Do(req.WithContext(ctx))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
+1
-1
@@ -67,7 +67,7 @@ func (f *fetcher) fetchReferrers(ctx context.Context, filter map[string]string,
|
||||
|
||||
var b []byte
|
||||
if resp.StatusCode == http.StatusOK && resp.Header.Get("Content-Type") == string(types.OCIImageIndex) {
|
||||
b, err = io.ReadAll(resp.Body)
|
||||
b, err = io.ReadAll(io.LimitReader(resp.Body, manifestLimit))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
+68
-6
@@ -26,14 +26,17 @@ import (
|
||||
"strings"
|
||||
"sync"
|
||||
|
||||
authchallenge "github.com/docker/distribution/registry/client/auth/challenge"
|
||||
|
||||
"github.com/google/go-containerregistry/internal/redact"
|
||||
"github.com/google/go-containerregistry/pkg/authn"
|
||||
"github.com/google/go-containerregistry/pkg/logs"
|
||||
"github.com/google/go-containerregistry/pkg/name"
|
||||
"github.com/google/go-containerregistry/pkg/v1/remote/internal/authchallenge"
|
||||
)
|
||||
|
||||
// maxTokenBodySize limits bearer token response body reads to prevent OOM
|
||||
// when a token endpoint returns an unexpectedly large body.
|
||||
const maxTokenBodySize = 64 * 1024 // 64 KiB
|
||||
|
||||
type Token struct {
|
||||
Token string `json:"token"`
|
||||
AccessToken string `json:"access_token,omitempty"`
|
||||
@@ -83,6 +86,13 @@ func fromChallenge(reg name.Registry, auth authn.Authenticator, t http.RoundTrip
|
||||
if !ok {
|
||||
return nil, fmt.Errorf("malformed www-authenticate, missing realm: %v", pr.Parameters)
|
||||
}
|
||||
// Validate the realm URL before storing it. A malicious or compromised
|
||||
// registry can supply a realm pointing at an internal service or cloud
|
||||
// metadata endpoint (e.g. 169.254.169.254), causing SSRF when the client
|
||||
// subsequently fetches a token.
|
||||
if err := validateRealmURL(realm, reg.RegistryStr(), pr.Insecure); err != nil {
|
||||
return nil, fmt.Errorf("invalid realm in www-authenticate: %w", err)
|
||||
}
|
||||
service := pr.Parameters["service"]
|
||||
scheme := "https"
|
||||
if pr.Insecure {
|
||||
@@ -99,6 +109,56 @@ func fromChallenge(reg name.Registry, auth authn.Authenticator, t http.RoundTrip
|
||||
}, nil
|
||||
}
|
||||
|
||||
// realmRedirectCheck mimics the default http.Client redirect policy but also
|
||||
// validates each redirect URL with validateRealmURL.
|
||||
func realmRedirectCheck(registryHost string, insecure bool) func(*http.Request, []*http.Request) error {
|
||||
return func(req *http.Request, via []*http.Request) error {
|
||||
if len(via) >= 10 {
|
||||
return fmt.Errorf("stopped after 10 redirects")
|
||||
}
|
||||
if err := validateRealmURL(req.URL.String(), registryHost, insecure); err != nil {
|
||||
return fmt.Errorf("refusing token-server redirect to %q: %w", req.URL, err)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// validateRealmURL returns an error if the realm URL uses a disallowed scheme
|
||||
// or resolves to a private / link-local IP address. Realm URLs matching the
|
||||
// registry host:port are always allowed. See #2258.
|
||||
func validateRealmURL(realm, registryHost string, insecure bool) error {
|
||||
u, err := url.Parse(realm)
|
||||
if err != nil {
|
||||
return fmt.Errorf("parsing realm %q: %w", realm, err)
|
||||
}
|
||||
switch u.Scheme {
|
||||
case "https":
|
||||
// always allowed
|
||||
case "http":
|
||||
if !insecure {
|
||||
return fmt.Errorf("realm scheme %q not allowed for a secure registry; use https", u.Scheme)
|
||||
}
|
||||
default:
|
||||
return fmt.Errorf("realm scheme %q not allowed; must be https (or http for insecure registries)", u.Scheme)
|
||||
}
|
||||
// Always allow realms matching the registry host:port.
|
||||
if registryHost != "" && u.Host == registryHost {
|
||||
return nil
|
||||
}
|
||||
// Reject IP literals that resolve to private or link-local ranges.
|
||||
// This blocks direct references to RFC 1918 addresses, loopback, and
|
||||
// link-local ranges including the cloud instance metadata service
|
||||
// (169.254.169.254 / fd00:ec2::254). DNS-based SSRF is out of scope
|
||||
// here; callers should apply network-level controls if needed.
|
||||
host := u.Hostname()
|
||||
if ip := net.ParseIP(host); ip != nil {
|
||||
if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() || ip.IsPrivate() || ip.IsUnspecified() {
|
||||
return fmt.Errorf("realm host %q is a private or link-local address", host)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
type bearerTransport struct {
|
||||
mx sync.RWMutex
|
||||
// Wrapped by bearerTransport.
|
||||
@@ -336,7 +396,8 @@ func (bt *bearerTransport) refreshOauth(ctx context.Context) ([]byte, error) {
|
||||
v.Set("access_type", "offline")
|
||||
}
|
||||
|
||||
client := http.Client{Transport: bt.inner}
|
||||
allowInsecure := bt.scheme == "http"
|
||||
client := http.Client{Transport: bt.inner, CheckRedirect: realmRedirectCheck(bt.registry.RegistryStr(), allowInsecure)}
|
||||
req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(v.Encode()))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
@@ -359,7 +420,7 @@ func (bt *bearerTransport) refreshOauth(ctx context.Context) ([]byte, error) {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return io.ReadAll(resp.Body)
|
||||
return io.ReadAll(io.LimitReader(resp.Body, maxTokenBodySize))
|
||||
}
|
||||
|
||||
// https://docs.docker.com/registry/spec/auth/token/
|
||||
@@ -373,7 +434,8 @@ func (bt *bearerTransport) refreshBasic(ctx context.Context) ([]byte, error) {
|
||||
auth: bt.basic,
|
||||
target: u.Host,
|
||||
}
|
||||
client := http.Client{Transport: b}
|
||||
allowInsecure := bt.scheme == "http"
|
||||
client := http.Client{Transport: b, CheckRedirect: realmRedirectCheck(bt.registry.RegistryStr(), allowInsecure)}
|
||||
|
||||
v := u.Query()
|
||||
bt.mx.RLock()
|
||||
@@ -403,5 +465,5 @@ func (bt *bearerTransport) refreshBasic(ctx context.Context) ([]byte, error) {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return io.ReadAll(resp.Body)
|
||||
return io.ReadAll(io.LimitReader(resp.Body, maxTokenBodySize))
|
||||
}
|
||||
|
||||
+13
-2
@@ -15,6 +15,7 @@
|
||||
package transport
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"io"
|
||||
@@ -112,6 +113,10 @@ type ErrorCode string
|
||||
|
||||
// The set of error conditions a registry may return:
|
||||
// https://github.com/distribution/distribution/blob/aac2f6c8b7c5a6c60190848bab5cbeed2b5ba0a9/docs/spec/api.md#errors-2
|
||||
// maxErrorBodySize limits HTTP error response body reads to prevent OOM when
|
||||
// a registry returns an unexpectedly large error body.
|
||||
const maxErrorBodySize = 64 * 1024 // 64 KiB
|
||||
|
||||
const (
|
||||
BlobUnknownErrorCode ErrorCode = "BLOB_UNKNOWN"
|
||||
BlobUploadInvalidErrorCode ErrorCode = "BLOB_UPLOAD_INVALID"
|
||||
@@ -146,6 +151,7 @@ var temporaryErrorCodes = map[ErrorCode]struct{}{
|
||||
|
||||
var temporaryStatusCodes = map[int]struct{}{
|
||||
http.StatusRequestTimeout: {},
|
||||
http.StatusTooManyRequests: {}, // matches TooManyRequestsErrorCode in temporaryErrorCodes
|
||||
http.StatusInternalServerError: {},
|
||||
http.StatusBadGateway: {},
|
||||
http.StatusServiceUnavailable: {},
|
||||
@@ -161,7 +167,7 @@ func CheckError(resp *http.Response, codes ...int) error {
|
||||
}
|
||||
}
|
||||
|
||||
b, err := io.ReadAll(resp.Body)
|
||||
b, err := io.ReadAll(io.LimitReader(resp.Body, maxErrorBodySize))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
@@ -185,11 +191,16 @@ func makeError(resp *http.Response, body []byte) *Error {
|
||||
}
|
||||
|
||||
func retryError(resp *http.Response) error {
|
||||
b, err := io.ReadAll(resp.Body)
|
||||
b, err := io.ReadAll(io.LimitReader(resp.Body, maxErrorBodySize))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Restore the body so that a subsequent CheckError call (after the
|
||||
// retry loop exhausts its retries) can still read and parse the
|
||||
// structured registry error from the response.
|
||||
resp.Body = io.NopCloser(bytes.NewReader(b))
|
||||
|
||||
rerr := makeError(resp, b)
|
||||
rerr.temporary = true
|
||||
return rerr
|
||||
|
||||
+1
-1
@@ -24,9 +24,9 @@ import (
|
||||
"strings"
|
||||
"time"
|
||||
|
||||
authchallenge "github.com/docker/distribution/registry/client/auth/challenge"
|
||||
"github.com/google/go-containerregistry/pkg/logs"
|
||||
"github.com/google/go-containerregistry/pkg/name"
|
||||
"github.com/google/go-containerregistry/pkg/v1/remote/internal/authchallenge"
|
||||
)
|
||||
|
||||
// 300ms is the default fallback period for go's DNS dialer but we could make this configurable.
|
||||
|
||||
+4
-2
@@ -18,7 +18,9 @@ package transport
|
||||
const (
|
||||
PullScope string = "pull"
|
||||
PushScope string = "push,pull"
|
||||
// For now DELETE is PUSH, which is the read/write ACL.
|
||||
DeleteScope string = PushScope
|
||||
// DeleteScope requests "delete" in addition to push/pull so that
|
||||
// registries requiring an explicit delete action (e.g. IBM Cloud
|
||||
// Container Registry) grant the necessary access.
|
||||
DeleteScope string = "push,pull,delete"
|
||||
CatalogScope string = "catalog"
|
||||
)
|
||||
|
||||
+55
-8
@@ -21,6 +21,7 @@ import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"net"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"sort"
|
||||
@@ -66,6 +67,25 @@ type writer struct {
|
||||
scopes []string
|
||||
}
|
||||
|
||||
// makeDeleteClient returns an HTTP client whose token includes the "delete"
|
||||
// action so that registries requiring an explicit delete permission grant
|
||||
// access for manifest deletion.
|
||||
func makeDeleteClient(ctx context.Context, repo name.Repository, o *options) (*http.Client, error) {
|
||||
auth := o.auth
|
||||
if o.keychain != nil {
|
||||
kauth, err := authn.Resolve(ctx, o.keychain, repo)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
auth = kauth
|
||||
}
|
||||
tr, err := transport.NewWithContext(ctx, repo.Registry, auth, o.transport, []string{repo.Scope(transport.DeleteScope)})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return &http.Client{Transport: tr}, nil
|
||||
}
|
||||
|
||||
func makeWriter(ctx context.Context, repo name.Repository, ls []v1.Layer, o *options) (*writer, error) {
|
||||
auth := o.auth
|
||||
if o.keychain != nil {
|
||||
@@ -148,7 +168,29 @@ func (w *writer) nextLocation(resp *http.Response) (string, error) {
|
||||
|
||||
// If the location header returned is just a url path, then fully qualify it.
|
||||
// We cannot simply call w.url, since there might be an embedded query string.
|
||||
return resp.Request.URL.ResolveReference(u).String(), nil
|
||||
resolved := resp.Request.URL.ResolveReference(u)
|
||||
|
||||
// Reject Location headers that redirect to a DIFFERENT host that resolves to
|
||||
// a private or link-local IP literal. A malicious or compromised registry can
|
||||
// respond to a blob upload initiation (POST /v2/.../blobs/uploads/) with a
|
||||
// crafted Location header pointing at an internal service, causing the client
|
||||
// to send subsequent PATCH/PUT requests (including the layer data as the body)
|
||||
// to that internal address. Pre-signed blob URLs from cloud storage providers
|
||||
// (GCS, S3, Azure Blob) use public hostnames, so legitimate cross-host
|
||||
// redirects are unaffected.
|
||||
//
|
||||
// Same-host redirects (e.g. a different path on the registry itself) are
|
||||
// always allowed regardless of whether the registry IP is private.
|
||||
origHost := resp.Request.URL.Hostname()
|
||||
if destHost := resolved.Hostname(); destHost != origHost {
|
||||
if ip := net.ParseIP(destHost); ip != nil {
|
||||
if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() || ip.IsPrivate() || ip.IsUnspecified() {
|
||||
return "", fmt.Errorf("SSRF protection: Location header redirects to private/link-local host %q", destHost)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return resolved.String(), nil
|
||||
}
|
||||
|
||||
// checkExistingBlob checks if a blob exists already in the repository by making a
|
||||
@@ -555,9 +597,10 @@ func (w *writer) commitManifest(ctx context.Context, t Taggable, ref name.Refere
|
||||
return err
|
||||
}
|
||||
var mf struct {
|
||||
MediaType types.MediaType `json:"mediaType"`
|
||||
Subject *v1.Descriptor `json:"subject,omitempty"`
|
||||
Config struct {
|
||||
MediaType types.MediaType `json:"mediaType"`
|
||||
Subject *v1.Descriptor `json:"subject,omitempty"`
|
||||
ArtifactType string `json:"artifactType,omitempty"`
|
||||
Config struct {
|
||||
MediaType types.MediaType `json:"mediaType"`
|
||||
} `json:"config"`
|
||||
}
|
||||
@@ -599,10 +642,14 @@ func (w *writer) commitManifest(ctx context.Context, t Taggable, ref name.Refere
|
||||
return err
|
||||
}
|
||||
desc := v1.Descriptor{
|
||||
ArtifactType: string(mf.Config.MediaType),
|
||||
MediaType: mf.MediaType,
|
||||
Digest: h,
|
||||
Size: size,
|
||||
MediaType: mf.MediaType,
|
||||
Digest: h,
|
||||
Size: size,
|
||||
}
|
||||
if mf.ArtifactType != "" {
|
||||
desc.ArtifactType = mf.ArtifactType
|
||||
} else {
|
||||
desc.ArtifactType = string(mf.Config.MediaType)
|
||||
}
|
||||
if err := w.commitSubjectReferrers(ctx,
|
||||
ref.Context().Digest(mf.Subject.Digest.String()),
|
||||
|
||||
+5
-52
@@ -22,10 +22,7 @@ import (
|
||||
"os"
|
||||
"sync"
|
||||
|
||||
"github.com/containerd/stargz-snapshotter/estargz"
|
||||
"github.com/google/go-containerregistry/internal/and"
|
||||
comp "github.com/google/go-containerregistry/internal/compression"
|
||||
gestargz "github.com/google/go-containerregistry/internal/estargz"
|
||||
ggzip "github.com/google/go-containerregistry/internal/gzip"
|
||||
"github.com/google/go-containerregistry/internal/zstd"
|
||||
"github.com/google/go-containerregistry/pkg/compression"
|
||||
@@ -43,7 +40,6 @@ type layer struct {
|
||||
compression compression.Compression
|
||||
compressionLevel int
|
||||
annotations map[string]string
|
||||
estgzopts []estargz.Option
|
||||
mediaType types.MediaType
|
||||
}
|
||||
|
||||
@@ -161,53 +157,15 @@ func WithCompressedCaching(l *layer) {
|
||||
// through estargz.Options to the underlying compression layer. This is
|
||||
// only meaningful when estargz is enabled.
|
||||
//
|
||||
// Deprecated: WithEstargz is deprecated, and will be removed in a future release.
|
||||
func WithEstargzOptions(opts ...estargz.Option) LayerOption {
|
||||
return func(l *layer) {
|
||||
l.estgzopts = opts
|
||||
}
|
||||
// Deprecated: WithEstargz is deprecated; it is a no-op.
|
||||
func WithEstargzOptions(...any) LayerOption {
|
||||
return func(*layer) {}
|
||||
}
|
||||
|
||||
// WithEstargz is a functional option that explicitly enables estargz support.
|
||||
//
|
||||
// Deprecated: WithEstargz is deprecated, and will be removed in a future release.
|
||||
func WithEstargz(l *layer) {
|
||||
oguncompressed := l.uncompressedopener
|
||||
estargz := func() (io.ReadCloser, error) {
|
||||
crc, err := oguncompressed()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
eopts := append(l.estgzopts, estargz.WithCompressionLevel(l.compressionLevel))
|
||||
rc, h, err := gestargz.ReadCloser(crc, eopts...)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
l.annotations[estargz.TOCJSONDigestAnnotation] = h.String()
|
||||
return &and.ReadCloser{
|
||||
Reader: rc,
|
||||
CloseFunc: func() error {
|
||||
err := rc.Close()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
// As an optimization, leverage the DiffID exposed by the estargz ReadCloser
|
||||
l.diffID, err = v1.NewHash(rc.DiffID().String())
|
||||
return err
|
||||
},
|
||||
}, nil
|
||||
}
|
||||
uncompressed := func() (io.ReadCloser, error) {
|
||||
urc, err := estargz()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return ggzip.UnzipReadCloser(urc)
|
||||
}
|
||||
|
||||
l.compressedopener = estargz
|
||||
l.uncompressedopener = uncompressed
|
||||
}
|
||||
// Deprecated: WithEstargz is deprecated; it is a no-op.
|
||||
func WithEstargz(*layer) {}
|
||||
|
||||
// LayerFromFile returns a v1.Layer given a tarball
|
||||
func LayerFromFile(path string, opts ...LayerOption) (v1.Layer, error) {
|
||||
@@ -241,11 +199,6 @@ func LayerFromOpener(opener Opener, opts ...LayerOption) (v1.Layer, error) {
|
||||
mediaType: types.DockerLayer,
|
||||
}
|
||||
|
||||
if estgz := os.Getenv("GGCR_EXPERIMENT_ESTARGZ"); estgz == "1" {
|
||||
logs.Warn.Println("GGCR_EXPERIMENT_ESTARGZ is deprecated, and will be removed in a future release.")
|
||||
opts = append([]LayerOption{WithEstargz}, opts...)
|
||||
}
|
||||
|
||||
switch comp {
|
||||
case compression.GZip:
|
||||
layer.compressedopener = opener
|
||||
|
||||
Reference in New Issue
Block a user