working commit
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+27
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Copyright (c) 2009 The Go Authors. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Google Inc. nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+22
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Additional IP Rights Grant (Patents)
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"This implementation" means the copyrightable works distributed by
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Google as part of the Go project.
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Google hereby grants to You a perpetual, worldwide, non-exclusive,
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no-charge, royalty-free, irrevocable (except as stated in this section)
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patent license to make, have made, use, offer to sell, sell, import,
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transfer and otherwise run, modify and propagate the contents of this
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implementation of Go, where such license applies only to those patent
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claims, both currently owned or controlled by Google and acquired in
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the future, licensable by Google that are necessarily infringed by this
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implementation of Go. This grant does not include claims that would be
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infringed only as a consequence of further modification of this
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implementation. If you or your agent or exclusive licensee institute or
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order or agree to the institution of patent litigation against any
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entity (including a cross-claim or counterclaim in a lawsuit) alleging
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that this implementation of Go or any code incorporated within this
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implementation of Go constitutes direct or contributory patent
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infringement, or inducement of patent infringement, then any patent
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rights granted to you under this License for this implementation of Go
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shall terminate as of the date such litigation is filed.
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+52
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//This package is copied from Go library text/template.
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//The original private functions indirect and printableValue
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//are exported as public functions.
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package template
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import (
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"fmt"
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"reflect"
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)
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var (
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errorType = reflect.TypeOf((*error)(nil)).Elem()
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fmtStringerType = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
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)
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// Indirect returns the item at the end of indirection, and a bool to indicate if it's nil.
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// We indirect through pointers and empty interfaces (only) because
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// non-empty interfaces have methods we might need.
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func Indirect(v reflect.Value) (rv reflect.Value, isNil bool) {
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for ; v.Kind() == reflect.Pointer || v.Kind() == reflect.Interface; v = v.Elem() {
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if v.IsNil() {
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return v, true
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}
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if v.Kind() == reflect.Interface && v.NumMethod() > 0 {
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break
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}
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}
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return v, false
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}
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// PrintableValue returns the, possibly indirected, interface value inside v that
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// is best for a call to formatted printer.
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func PrintableValue(v reflect.Value) (interface{}, bool) {
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if v.Kind() == reflect.Pointer {
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v, _ = Indirect(v) // fmt.Fprint handles nil.
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}
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if !v.IsValid() {
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return "<no value>", true
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}
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if !v.Type().Implements(errorType) && !v.Type().Implements(fmtStringerType) {
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if v.CanAddr() && (reflect.PointerTo(v.Type()).Implements(errorType) || reflect.PointerTo(v.Type()).Implements(fmtStringerType)) {
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v = v.Addr()
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} else {
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switch v.Kind() {
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case reflect.Chan, reflect.Func:
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return nil, false
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}
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}
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}
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return v.Interface(), true
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}
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+177
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//This package is copied from Go library text/template.
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//The original private functions eq, ge, gt, le, lt, and ne
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//are exported as public functions.
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package template
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import (
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"errors"
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"reflect"
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)
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var (
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errBadComparisonType = errors.New("invalid type for comparison")
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errBadComparison = errors.New("incompatible types for comparison")
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errNoComparison = errors.New("missing argument for comparison")
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)
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type kind int
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const (
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invalidKind kind = iota
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boolKind
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complexKind
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intKind
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floatKind
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integerKind
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stringKind
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uintKind
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)
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func basicKind(v reflect.Value) (kind, error) {
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switch v.Kind() {
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case reflect.Bool:
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return boolKind, nil
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return intKind, nil
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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return uintKind, nil
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case reflect.Float32, reflect.Float64:
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return floatKind, nil
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case reflect.Complex64, reflect.Complex128:
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return complexKind, nil
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case reflect.String:
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return stringKind, nil
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}
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return invalidKind, errBadComparisonType
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}
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// Equal evaluates the comparison a == b || a == c || ...
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func Equal(arg1 interface{}, arg2 ...interface{}) (bool, error) {
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v1 := reflect.ValueOf(arg1)
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k1, err := basicKind(v1)
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if err != nil {
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return false, err
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}
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if len(arg2) == 0 {
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return false, errNoComparison
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}
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for _, arg := range arg2 {
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v2 := reflect.ValueOf(arg)
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k2, err := basicKind(v2)
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if err != nil {
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return false, err
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}
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truth := false
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if k1 != k2 {
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// Special case: Can compare integer values regardless of type's sign.
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switch {
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case k1 == intKind && k2 == uintKind:
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truth = v1.Int() >= 0 && uint64(v1.Int()) == v2.Uint()
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case k1 == uintKind && k2 == intKind:
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truth = v2.Int() >= 0 && v1.Uint() == uint64(v2.Int())
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default:
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return false, errBadComparison
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}
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} else {
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switch k1 {
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case boolKind:
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truth = v1.Bool() == v2.Bool()
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case complexKind:
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truth = v1.Complex() == v2.Complex()
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case floatKind:
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truth = v1.Float() == v2.Float()
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case intKind:
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truth = v1.Int() == v2.Int()
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case stringKind:
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truth = v1.String() == v2.String()
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case uintKind:
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truth = v1.Uint() == v2.Uint()
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default:
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panic("invalid kind")
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}
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}
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if truth {
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return true, nil
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}
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}
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return false, nil
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}
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// NotEqual evaluates the comparison a != b.
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func NotEqual(arg1, arg2 interface{}) (bool, error) {
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// != is the inverse of ==.
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equal, err := Equal(arg1, arg2)
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return !equal, err
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}
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// Less evaluates the comparison a < b.
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func Less(arg1, arg2 interface{}) (bool, error) {
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v1 := reflect.ValueOf(arg1)
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k1, err := basicKind(v1)
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if err != nil {
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return false, err
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}
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v2 := reflect.ValueOf(arg2)
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k2, err := basicKind(v2)
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if err != nil {
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return false, err
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}
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truth := false
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if k1 != k2 {
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// Special case: Can compare integer values regardless of type's sign.
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switch {
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case k1 == intKind && k2 == uintKind:
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truth = v1.Int() < 0 || uint64(v1.Int()) < v2.Uint()
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case k1 == uintKind && k2 == intKind:
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truth = v2.Int() >= 0 && v1.Uint() < uint64(v2.Int())
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default:
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return false, errBadComparison
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}
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} else {
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switch k1 {
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case boolKind, complexKind:
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return false, errBadComparisonType
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case floatKind:
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truth = v1.Float() < v2.Float()
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case intKind:
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truth = v1.Int() < v2.Int()
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case stringKind:
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truth = v1.String() < v2.String()
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case uintKind:
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truth = v1.Uint() < v2.Uint()
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default:
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panic("invalid kind")
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}
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}
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return truth, nil
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}
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// LessEqual evaluates the comparison <= b.
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func LessEqual(arg1, arg2 interface{}) (bool, error) {
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// <= is < or ==.
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lessThan, err := Less(arg1, arg2)
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if lessThan || err != nil {
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return lessThan, err
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}
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return Equal(arg1, arg2)
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}
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// Greater evaluates the comparison a > b.
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func Greater(arg1, arg2 interface{}) (bool, error) {
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// > is the inverse of <=.
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lessOrEqual, err := LessEqual(arg1, arg2)
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if err != nil {
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return false, err
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}
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return !lessOrEqual, nil
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}
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// GreaterEqual evaluates the comparison a >= b.
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func GreaterEqual(arg1, arg2 interface{}) (bool, error) {
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// >= is the inverse of <.
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lessThan, err := Less(arg1, arg2)
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if err != nil {
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return false, err
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}
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return !lessThan, nil
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}
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