1369 lines
37 KiB
Go
1369 lines
37 KiB
Go
// Copyright 2006-2010 Kirill Simonov
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// Copyright 2011-2019 Canonical Ltd
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// Copyright 2025 The go-yaml Project Contributors
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// SPDX-License-Identifier: Apache-2.0 AND MIT
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// Parser stage: Transforms token stream into event stream.
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// Implements a recursive-descent parser (LL(1)) following the YAML grammar specification.
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//
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// The parser implements the following grammar:
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//
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// stream ::= STREAM-START implicit_document? explicit_document* STREAM-END
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// implicit_document ::= block_node DOCUMENT-END*
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// explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
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// block_node_or_indentless_sequence ::=
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// ALIAS
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// | properties (block_content | indentless_block_sequence)?
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// | block_content
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// | indentless_block_sequence
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// block_node ::= ALIAS
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// | properties block_content?
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// | block_content
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// flow_node ::= ALIAS
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// | properties flow_content?
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// | flow_content
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// properties ::= TAG ANCHOR? | ANCHOR TAG?
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// block_content ::= block_collection | flow_collection | SCALAR
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// flow_content ::= flow_collection | SCALAR
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// block_collection ::= block_sequence | block_mapping
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// flow_collection ::= flow_sequence | flow_mapping
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// block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END
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// indentless_sequence ::= (BLOCK-ENTRY block_node?)+
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// block_mapping ::= BLOCK-MAPPING_START
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// ((KEY block_node_or_indentless_sequence?)?
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// (VALUE block_node_or_indentless_sequence?)?)*
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// BLOCK-END
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// flow_sequence ::= FLOW-SEQUENCE-START
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// (flow_sequence_entry FLOW-ENTRY)*
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// flow_sequence_entry?
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// FLOW-SEQUENCE-END
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// flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
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// flow_mapping ::= FLOW-MAPPING-START
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// (flow_mapping_entry FLOW-ENTRY)*
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// flow_mapping_entry?
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// FLOW-MAPPING-END
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// flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
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package libyaml
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import (
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"bytes"
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"io"
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"strings"
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)
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// Peek the next token in the token queue.
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func (parser *Parser) peekToken(out **Token) error {
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if !parser.token_available {
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if err := parser.fetchMoreTokens(); err != nil {
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return err
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}
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}
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token := &parser.tokens[parser.tokens_head]
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parser.UnfoldComments(token)
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*out = token
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return nil
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}
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// UnfoldComments walks through the comments queue and joins all
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// comments behind the position of the provided token into the respective
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// top-level comment slices in the parser.
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func (parser *Parser) UnfoldComments(token *Token) {
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for parser.comments_head < len(parser.comments) && token.StartMark.Index >= parser.comments[parser.comments_head].TokenMark.Index {
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comment := &parser.comments[parser.comments_head]
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if len(comment.Head) > 0 {
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if token.Type == BLOCK_END_TOKEN {
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// No heads on ends, so keep comment.Head for a follow up token.
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break
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}
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if len(parser.HeadComment) > 0 {
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parser.HeadComment = append(parser.HeadComment, '\n')
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}
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parser.HeadComment = append(parser.HeadComment, comment.Head...)
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}
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if len(comment.Foot) > 0 {
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if len(parser.FootComment) > 0 {
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parser.FootComment = append(parser.FootComment, '\n')
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}
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parser.FootComment = append(parser.FootComment, comment.Foot...)
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}
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if len(comment.Line) > 0 {
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if len(parser.LineComment) > 0 {
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parser.LineComment = append(parser.LineComment, '\n')
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}
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parser.LineComment = append(parser.LineComment, comment.Line...)
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}
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*comment = Comment{}
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parser.comments_head++
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}
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}
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// Remove the next token from the queue (must be called after peek_token).
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func (parser *Parser) skipToken() {
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parser.token_available = false
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parser.tokens_parsed++
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parser.stream_end_produced = parser.tokens[parser.tokens_head].Type == STREAM_END_TOKEN
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parser.tokens_head++
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}
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// Parse gets the next event.
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func (parser *Parser) Parse(event *Event) error {
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// Erase the event object.
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*event = Event{}
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if parser.lastError != nil {
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return parser.lastError
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}
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// No events after the end of the stream or error.
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if parser.stream_end_produced || parser.state == PARSE_END_STATE {
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return io.EOF
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}
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// Generate the next event.
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if err := parser.stateMachine(event); err != nil {
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parser.lastError = err
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return err
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}
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return nil
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}
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func formatParserError(problem string, problem_mark Mark) error {
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return ParserError{
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Mark: problem_mark,
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Message: problem,
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}
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}
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func formatParserErrorContext(context string, context_mark Mark, problem string, problem_mark Mark) error {
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return ParserError{
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ContextMark: context_mark,
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ContextMessage: context,
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Mark: problem_mark,
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Message: problem,
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}
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}
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// State dispatcher.
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func (parser *Parser) stateMachine(event *Event) error {
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// trace("yaml_parser_state_machine", "state:", parser.state.String())
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switch parser.state {
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case PARSE_STREAM_START_STATE:
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return parser.parseStreamStart(event)
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case PARSE_IMPLICIT_DOCUMENT_START_STATE:
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return parser.parseDocumentStart(event, true)
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case PARSE_DOCUMENT_START_STATE:
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return parser.parseDocumentStart(event, false)
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case PARSE_DOCUMENT_CONTENT_STATE:
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return parser.parseDocumentContent(event)
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case PARSE_DOCUMENT_END_STATE:
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return parser.parseDocumentEnd(event)
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case PARSE_BLOCK_NODE_STATE:
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return parser.parseNode(event, true, false)
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case PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE:
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return parser.parseBlockSequenceEntry(event, true)
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case PARSE_BLOCK_SEQUENCE_ENTRY_STATE:
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return parser.parseBlockSequenceEntry(event, false)
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case PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE:
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return parser.parseIndentlessSequenceEntry(event)
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case PARSE_BLOCK_MAPPING_FIRST_KEY_STATE:
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return parser.parseBlockMappingKey(event, true)
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case PARSE_BLOCK_MAPPING_KEY_STATE:
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return parser.parseBlockMappingKey(event, false)
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case PARSE_BLOCK_MAPPING_VALUE_STATE:
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return parser.parseBlockMappingValue(event)
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case PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE:
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return parser.parseFlowSequenceEntry(event, true)
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case PARSE_FLOW_SEQUENCE_ENTRY_STATE:
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return parser.parseFlowSequenceEntry(event, false)
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case PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE:
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return parser.parseFlowSequenceEntryMappingKey(event)
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case PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE:
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return parser.parseFlowSequenceEntryMappingValue(event)
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case PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE:
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return parser.parseFlowSequenceEntryMappingEnd(event)
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case PARSE_FLOW_MAPPING_FIRST_KEY_STATE:
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return parser.parseFlowMappingKey(event, true)
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case PARSE_FLOW_MAPPING_KEY_STATE:
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return parser.parseFlowMappingKey(event, false)
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case PARSE_FLOW_MAPPING_VALUE_STATE:
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return parser.parseFlowMappingValue(event, false)
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case PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE:
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return parser.parseFlowMappingValue(event, true)
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default:
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panic("invalid parser state")
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}
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}
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// Parse the production:
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// stream ::= STREAM-START implicit_document? explicit_document* STREAM-END
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//
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// ************
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func (parser *Parser) parseStreamStart(event *Event) error {
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var token *Token
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if err := parser.peekToken(&token); err != nil {
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return err
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}
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if token.Type != STREAM_START_TOKEN {
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return formatParserError("did not find expected <stream-start>", token.StartMark)
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}
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parser.state = PARSE_IMPLICIT_DOCUMENT_START_STATE
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*event = Event{
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Type: STREAM_START_EVENT,
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StartMark: token.StartMark,
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EndMark: token.EndMark,
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encoding: token.encoding,
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}
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parser.skipToken()
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return nil
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}
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// Parse the productions:
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// implicit_document ::= block_node DOCUMENT-END*
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//
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// *
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//
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// explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
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//
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// *************************
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func (parser *Parser) parseDocumentStart(event *Event, implicit bool) error {
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var token *Token
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if err := parser.peekToken(&token); err != nil {
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return err
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}
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// Parse extra document end indicators.
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if !implicit {
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for token.Type == DOCUMENT_END_TOKEN {
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parser.skipToken()
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if err := parser.peekToken(&token); err != nil {
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return err
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}
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}
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}
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if implicit && token.Type != VERSION_DIRECTIVE_TOKEN &&
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token.Type != TAG_DIRECTIVE_TOKEN &&
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token.Type != DOCUMENT_START_TOKEN &&
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token.Type != STREAM_END_TOKEN {
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// Parse an implicit document.
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if err := parser.processDirectives(nil, nil); err != nil {
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return err
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}
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parser.states = append(parser.states, PARSE_DOCUMENT_END_STATE)
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parser.state = PARSE_BLOCK_NODE_STATE
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var head_comment []byte
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if len(parser.HeadComment) > 0 {
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// [Go] Scan the header comment backwards, and if an empty line is found, break
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// the header so the part before the last empty line goes into the
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// document header, while the bottom of it goes into a follow up event.
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for i := len(parser.HeadComment) - 1; i > 0; i-- {
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if parser.HeadComment[i] == '\n' {
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if i == len(parser.HeadComment)-1 {
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head_comment = parser.HeadComment[:i]
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parser.HeadComment = parser.HeadComment[i+1:]
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break
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} else if parser.HeadComment[i-1] == '\n' {
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head_comment = parser.HeadComment[:i-1]
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parser.HeadComment = parser.HeadComment[i+1:]
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break
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}
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}
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}
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}
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*event = Event{
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Type: DOCUMENT_START_EVENT,
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StartMark: token.StartMark,
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EndMark: token.EndMark,
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Implicit: true,
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HeadComment: head_comment,
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}
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} else if token.Type != STREAM_END_TOKEN {
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// Parse an explicit document.
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var version_directive *VersionDirective
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var tag_directives []TagDirective
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start_mark := token.StartMark
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if err := parser.processDirectives(&version_directive, &tag_directives); err != nil {
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return err
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}
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if err := parser.peekToken(&token); err != nil {
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return err
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}
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if token.Type != DOCUMENT_START_TOKEN {
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return formatParserError(
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"did not find expected <document start>", token.StartMark)
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}
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parser.states = append(parser.states, PARSE_DOCUMENT_END_STATE)
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parser.state = PARSE_DOCUMENT_CONTENT_STATE
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end_mark := token.EndMark
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*event = Event{
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Type: DOCUMENT_START_EVENT,
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StartMark: start_mark,
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EndMark: end_mark,
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versionDirective: version_directive,
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tagDirectives: tag_directives,
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Implicit: false,
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}
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parser.skipToken()
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} else {
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// Parse the stream end.
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parser.state = PARSE_END_STATE
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*event = Event{
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Type: STREAM_END_EVENT,
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StartMark: token.StartMark,
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EndMark: token.EndMark,
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}
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parser.skipToken()
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}
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return nil
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}
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// Parse the productions:
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// explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
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//
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// ***********
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func (parser *Parser) parseDocumentContent(event *Event) error {
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var token *Token
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if err := parser.peekToken(&token); err != nil {
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return err
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}
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if token.Type == VERSION_DIRECTIVE_TOKEN ||
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token.Type == TAG_DIRECTIVE_TOKEN ||
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token.Type == DOCUMENT_START_TOKEN ||
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token.Type == DOCUMENT_END_TOKEN ||
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token.Type == STREAM_END_TOKEN {
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parser.state = parser.states[len(parser.states)-1]
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parser.states = parser.states[:len(parser.states)-1]
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return parser.processEmptyScalar(event,
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token.StartMark)
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}
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return parser.parseNode(event, true, false)
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}
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// Parse the productions:
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// implicit_document ::= block_node DOCUMENT-END*
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//
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// *************
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//
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// explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
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func (parser *Parser) parseDocumentEnd(event *Event) error {
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var token *Token
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if err := parser.peekToken(&token); err != nil {
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return err
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}
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start_mark := token.StartMark
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end_mark := token.StartMark
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implicit := true
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if token.Type == DOCUMENT_END_TOKEN {
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end_mark = token.EndMark
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parser.skipToken()
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implicit = false
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}
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parser.tag_directives = parser.tag_directives[:0]
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parser.state = PARSE_DOCUMENT_START_STATE
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*event = Event{
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Type: DOCUMENT_END_EVENT,
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StartMark: start_mark,
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EndMark: end_mark,
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Implicit: implicit,
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}
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parser.setEventComments(event)
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if len(event.HeadComment) > 0 && len(event.FootComment) == 0 {
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event.FootComment = event.HeadComment
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event.HeadComment = nil
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}
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return nil
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}
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func (parser *Parser) setEventComments(event *Event) {
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event.HeadComment = parser.HeadComment
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event.LineComment = parser.LineComment
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event.FootComment = parser.FootComment
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parser.HeadComment = nil
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parser.LineComment = nil
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parser.FootComment = nil
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parser.tail_comment = nil
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parser.stem_comment = nil
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}
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|
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// Parse the productions:
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// block_node_or_indentless_sequence ::=
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//
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// ALIAS
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// *****
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// | properties (block_content | indentless_block_sequence)?
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// ********** *
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// | block_content | indentless_block_sequence
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// *
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//
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// block_node ::= ALIAS
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//
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// *****
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// | properties block_content?
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// ********** *
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// | block_content
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// *
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//
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// flow_node ::= ALIAS
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//
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// *****
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// | properties flow_content?
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// ********** *
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// | flow_content
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// *
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//
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// properties ::= TAG ANCHOR? | ANCHOR TAG?
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//
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// *************************
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//
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// block_content ::= block_collection | flow_collection | SCALAR
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//
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// ******
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//
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// flow_content ::= flow_collection | SCALAR
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//
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// ******
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func (parser *Parser) parseNode(event *Event, block, indentless_sequence bool) error {
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// defer trace("yaml_parser_parse_node", "block:", block, "indentless_sequence:", indentless_sequence)()
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var token *Token
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if err := parser.peekToken(&token); err != nil {
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return err
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}
|
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|
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if token.Type == ALIAS_TOKEN {
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parser.state = parser.states[len(parser.states)-1]
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parser.states = parser.states[:len(parser.states)-1]
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*event = Event{
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Type: ALIAS_EVENT,
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StartMark: token.StartMark,
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EndMark: token.EndMark,
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Anchor: token.Value,
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}
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parser.setEventComments(event)
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parser.skipToken()
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return nil
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}
|
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|
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start_mark := token.StartMark
|
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end_mark := token.StartMark
|
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|
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var tag_token bool
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var tag_handle, tag_suffix, anchor []byte
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var tag_mark Mark
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switch token.Type {
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case ANCHOR_TOKEN:
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anchor = token.Value
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start_mark = token.StartMark
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end_mark = token.EndMark
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parser.skipToken()
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if err := parser.peekToken(&token); err != nil {
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return err
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}
|
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if token.Type == TAG_TOKEN {
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tag_token = true
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tag_handle = token.Value
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tag_suffix = token.suffix
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tag_mark = token.StartMark
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end_mark = token.EndMark
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parser.skipToken()
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if err := parser.peekToken(&token); err != nil {
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return err
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}
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}
|
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case TAG_TOKEN:
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tag_token = true
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tag_handle = token.Value
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tag_suffix = token.suffix
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start_mark = token.StartMark
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tag_mark = token.StartMark
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end_mark = token.EndMark
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parser.skipToken()
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if err := parser.peekToken(&token); err != nil {
|
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return err
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}
|
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if token.Type == ANCHOR_TOKEN {
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anchor = token.Value
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end_mark = token.EndMark
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parser.skipToken()
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if err := parser.peekToken(&token); err != nil {
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return err
|
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}
|
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}
|
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}
|
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|
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var tag []byte
|
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if tag_token {
|
|
if len(tag_handle) == 0 {
|
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tag = tag_suffix
|
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} else {
|
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for i := range parser.tag_directives {
|
|
if bytes.Equal(parser.tag_directives[i].handle, tag_handle) {
|
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tag = append([]byte(nil), parser.tag_directives[i].prefix...)
|
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tag = append(tag, tag_suffix...)
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break
|
|
}
|
|
}
|
|
if len(tag) == 0 {
|
|
return formatParserErrorContext(
|
|
"while parsing a node", start_mark,
|
|
"found undefined tag handle", tag_mark)
|
|
}
|
|
}
|
|
}
|
|
|
|
implicit := len(tag) == 0
|
|
if indentless_sequence && token.Type == BLOCK_ENTRY_TOKEN {
|
|
end_mark = token.EndMark
|
|
parser.state = PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE
|
|
*event = Event{
|
|
Type: SEQUENCE_START_EVENT,
|
|
StartMark: start_mark,
|
|
EndMark: end_mark,
|
|
Anchor: anchor,
|
|
Tag: tag,
|
|
Implicit: implicit,
|
|
Style: Style(BLOCK_SEQUENCE_STYLE),
|
|
}
|
|
return nil
|
|
}
|
|
if token.Type == SCALAR_TOKEN {
|
|
var plain_implicit, quoted_implicit bool
|
|
end_mark = token.EndMark
|
|
if (len(tag) == 0 && token.Style == PLAIN_SCALAR_STYLE) || (len(tag) == 1 && tag[0] == '!') {
|
|
plain_implicit = true
|
|
} else if len(tag) == 0 {
|
|
quoted_implicit = true
|
|
}
|
|
parser.state = parser.states[len(parser.states)-1]
|
|
parser.states = parser.states[:len(parser.states)-1]
|
|
|
|
*event = Event{
|
|
Type: SCALAR_EVENT,
|
|
StartMark: start_mark,
|
|
EndMark: end_mark,
|
|
Anchor: anchor,
|
|
Tag: tag,
|
|
Value: token.Value,
|
|
Implicit: plain_implicit,
|
|
quoted_implicit: quoted_implicit,
|
|
Style: Style(token.Style),
|
|
}
|
|
parser.setEventComments(event)
|
|
parser.skipToken()
|
|
return nil
|
|
}
|
|
if token.Type == FLOW_SEQUENCE_START_TOKEN {
|
|
// [Go] Some of the events below can be merged as they differ only on style.
|
|
end_mark = token.EndMark
|
|
parser.state = PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE
|
|
*event = Event{
|
|
Type: SEQUENCE_START_EVENT,
|
|
StartMark: start_mark,
|
|
EndMark: end_mark,
|
|
Anchor: anchor,
|
|
Tag: tag,
|
|
Implicit: implicit,
|
|
Style: Style(FLOW_SEQUENCE_STYLE),
|
|
}
|
|
parser.setEventComments(event)
|
|
return nil
|
|
}
|
|
if token.Type == FLOW_MAPPING_START_TOKEN {
|
|
end_mark = token.EndMark
|
|
parser.state = PARSE_FLOW_MAPPING_FIRST_KEY_STATE
|
|
*event = Event{
|
|
Type: MAPPING_START_EVENT,
|
|
StartMark: start_mark,
|
|
EndMark: end_mark,
|
|
Anchor: anchor,
|
|
Tag: tag,
|
|
Implicit: implicit,
|
|
Style: Style(FLOW_MAPPING_STYLE),
|
|
}
|
|
parser.setEventComments(event)
|
|
return nil
|
|
}
|
|
if block && token.Type == BLOCK_SEQUENCE_START_TOKEN {
|
|
end_mark = token.EndMark
|
|
parser.state = PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE
|
|
*event = Event{
|
|
Type: SEQUENCE_START_EVENT,
|
|
StartMark: start_mark,
|
|
EndMark: end_mark,
|
|
Anchor: anchor,
|
|
Tag: tag,
|
|
Implicit: implicit,
|
|
Style: Style(BLOCK_SEQUENCE_STYLE),
|
|
}
|
|
if parser.stem_comment != nil {
|
|
event.HeadComment = parser.stem_comment
|
|
parser.stem_comment = nil
|
|
}
|
|
return nil
|
|
}
|
|
if block && token.Type == BLOCK_MAPPING_START_TOKEN {
|
|
end_mark = token.EndMark
|
|
parser.state = PARSE_BLOCK_MAPPING_FIRST_KEY_STATE
|
|
*event = Event{
|
|
Type: MAPPING_START_EVENT,
|
|
StartMark: start_mark,
|
|
EndMark: end_mark,
|
|
Anchor: anchor,
|
|
Tag: tag,
|
|
Implicit: implicit,
|
|
Style: Style(BLOCK_MAPPING_STYLE),
|
|
}
|
|
if parser.stem_comment != nil {
|
|
event.HeadComment = parser.stem_comment
|
|
parser.stem_comment = nil
|
|
}
|
|
return nil
|
|
}
|
|
if len(anchor) > 0 || len(tag) > 0 {
|
|
parser.state = parser.states[len(parser.states)-1]
|
|
parser.states = parser.states[:len(parser.states)-1]
|
|
|
|
*event = Event{
|
|
Type: SCALAR_EVENT,
|
|
StartMark: start_mark,
|
|
EndMark: end_mark,
|
|
Anchor: anchor,
|
|
Tag: tag,
|
|
Implicit: implicit,
|
|
quoted_implicit: false,
|
|
Style: Style(PLAIN_SCALAR_STYLE),
|
|
}
|
|
return nil
|
|
}
|
|
|
|
context := "while parsing a flow node"
|
|
if block {
|
|
context = "while parsing a block node"
|
|
}
|
|
return formatParserErrorContext(context, start_mark,
|
|
"did not find expected node content", token.StartMark)
|
|
}
|
|
|
|
// Parse the productions:
|
|
// block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END
|
|
//
|
|
// ******************** *********** * *********
|
|
func (parser *Parser) parseBlockSequenceEntry(event *Event, first bool) error {
|
|
if first {
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
parser.marks = append(parser.marks, token.StartMark)
|
|
parser.skipToken()
|
|
}
|
|
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
|
|
if token.Type == BLOCK_ENTRY_TOKEN {
|
|
mark := token.EndMark
|
|
prior_head_len := len(parser.HeadComment)
|
|
parser.skipToken()
|
|
if err := parser.splitStemComment(prior_head_len); err != nil {
|
|
return err
|
|
}
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type != BLOCK_ENTRY_TOKEN && token.Type != BLOCK_END_TOKEN {
|
|
parser.states = append(parser.states, PARSE_BLOCK_SEQUENCE_ENTRY_STATE)
|
|
return parser.parseNode(event, true, false)
|
|
} else {
|
|
parser.state = PARSE_BLOCK_SEQUENCE_ENTRY_STATE
|
|
return parser.processEmptyScalar(event, mark)
|
|
}
|
|
}
|
|
if token.Type == BLOCK_END_TOKEN {
|
|
parser.state = parser.states[len(parser.states)-1]
|
|
parser.states = parser.states[:len(parser.states)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
|
|
*event = Event{
|
|
Type: SEQUENCE_END_EVENT,
|
|
StartMark: token.StartMark,
|
|
EndMark: token.EndMark,
|
|
}
|
|
|
|
parser.skipToken()
|
|
return nil
|
|
}
|
|
|
|
context_mark := parser.marks[len(parser.marks)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
return formatParserErrorContext(
|
|
"while parsing a block collection", context_mark,
|
|
"did not find expected '-' indicator", token.StartMark)
|
|
}
|
|
|
|
// Parse the productions:
|
|
// indentless_sequence ::= (BLOCK-ENTRY block_node?)+
|
|
//
|
|
// *********** *
|
|
func (parser *Parser) parseIndentlessSequenceEntry(event *Event) error {
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
|
|
if token.Type == BLOCK_ENTRY_TOKEN {
|
|
mark := token.EndMark
|
|
prior_head_len := len(parser.HeadComment)
|
|
parser.skipToken()
|
|
if err := parser.splitStemComment(prior_head_len); err != nil {
|
|
return err
|
|
}
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type != BLOCK_ENTRY_TOKEN &&
|
|
token.Type != KEY_TOKEN &&
|
|
token.Type != VALUE_TOKEN &&
|
|
token.Type != BLOCK_END_TOKEN {
|
|
parser.states = append(parser.states, PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE)
|
|
return parser.parseNode(event, true, false)
|
|
}
|
|
parser.state = PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE
|
|
return parser.processEmptyScalar(event, mark)
|
|
}
|
|
parser.state = parser.states[len(parser.states)-1]
|
|
parser.states = parser.states[:len(parser.states)-1]
|
|
|
|
*event = Event{
|
|
Type: SEQUENCE_END_EVENT,
|
|
StartMark: token.StartMark,
|
|
EndMark: token.StartMark, // [Go] Shouldn't this be token.end_mark?
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Split stem comment from head comment.
|
|
//
|
|
// When a sequence or map is found under a sequence entry, the former head comment
|
|
// is assigned to the underlying sequence or map as a whole, not the individual
|
|
// sequence or map entry as would be expected otherwise. To handle this case the
|
|
// previous head comment is moved aside as the stem comment.
|
|
func (parser *Parser) splitStemComment(stem_len int) error {
|
|
if stem_len == 0 {
|
|
return nil
|
|
}
|
|
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type != BLOCK_SEQUENCE_START_TOKEN && token.Type != BLOCK_MAPPING_START_TOKEN {
|
|
return nil
|
|
}
|
|
|
|
parser.stem_comment = parser.HeadComment[:stem_len]
|
|
if len(parser.HeadComment) == stem_len {
|
|
parser.HeadComment = nil
|
|
} else {
|
|
// Copy suffix to prevent very strange bugs if someone ever appends
|
|
// further bytes to the prefix in the stem_comment slice above.
|
|
parser.HeadComment = append([]byte(nil), parser.HeadComment[stem_len+1:]...)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Parse the productions:
|
|
// block_mapping ::= BLOCK-MAPPING_START
|
|
//
|
|
// *******************
|
|
// ((KEY block_node_or_indentless_sequence?)?
|
|
// *** *
|
|
// (VALUE block_node_or_indentless_sequence?)?)*
|
|
//
|
|
// BLOCK-END
|
|
// *********
|
|
func (parser *Parser) parseBlockMappingKey(event *Event, first bool) error {
|
|
if first {
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
parser.marks = append(parser.marks, token.StartMark)
|
|
parser.skipToken()
|
|
}
|
|
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
|
|
// [Go] A tail comment was left from the prior mapping value processed. Emit an event
|
|
// as it needs to be processed with that value and not the following key.
|
|
if len(parser.tail_comment) > 0 {
|
|
*event = Event{
|
|
Type: TAIL_COMMENT_EVENT,
|
|
StartMark: token.StartMark,
|
|
EndMark: token.EndMark,
|
|
FootComment: parser.tail_comment,
|
|
}
|
|
parser.tail_comment = nil
|
|
return nil
|
|
}
|
|
|
|
switch token.Type {
|
|
case KEY_TOKEN:
|
|
mark := token.EndMark
|
|
parser.skipToken()
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type != KEY_TOKEN &&
|
|
token.Type != VALUE_TOKEN &&
|
|
token.Type != BLOCK_END_TOKEN {
|
|
parser.states = append(parser.states, PARSE_BLOCK_MAPPING_VALUE_STATE)
|
|
return parser.parseNode(event, true, true)
|
|
} else {
|
|
parser.state = PARSE_BLOCK_MAPPING_VALUE_STATE
|
|
return parser.processEmptyScalar(event, mark)
|
|
}
|
|
case BLOCK_END_TOKEN:
|
|
parser.state = parser.states[len(parser.states)-1]
|
|
parser.states = parser.states[:len(parser.states)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
*event = Event{
|
|
Type: MAPPING_END_EVENT,
|
|
StartMark: token.StartMark,
|
|
EndMark: token.EndMark,
|
|
}
|
|
parser.setEventComments(event)
|
|
parser.skipToken()
|
|
return nil
|
|
}
|
|
|
|
context_mark := parser.marks[len(parser.marks)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
return formatParserErrorContext(
|
|
"while parsing a block mapping", context_mark,
|
|
"did not find expected key", token.StartMark)
|
|
}
|
|
|
|
// Parse the productions:
|
|
// block_mapping ::= BLOCK-MAPPING_START
|
|
//
|
|
// ((KEY block_node_or_indentless_sequence?)?
|
|
//
|
|
// (VALUE block_node_or_indentless_sequence?)?)*
|
|
// ***** *
|
|
// BLOCK-END
|
|
func (parser *Parser) parseBlockMappingValue(event *Event) error {
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type == VALUE_TOKEN {
|
|
mark := token.EndMark
|
|
parser.skipToken()
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type != KEY_TOKEN &&
|
|
token.Type != VALUE_TOKEN &&
|
|
token.Type != BLOCK_END_TOKEN {
|
|
parser.states = append(parser.states, PARSE_BLOCK_MAPPING_KEY_STATE)
|
|
return parser.parseNode(event, true, true)
|
|
}
|
|
parser.state = PARSE_BLOCK_MAPPING_KEY_STATE
|
|
return parser.processEmptyScalar(event, mark)
|
|
}
|
|
parser.state = PARSE_BLOCK_MAPPING_KEY_STATE
|
|
return parser.processEmptyScalar(event, token.StartMark)
|
|
}
|
|
|
|
// Parse the productions:
|
|
// flow_sequence ::= FLOW-SEQUENCE-START
|
|
//
|
|
// *******************
|
|
// (flow_sequence_entry FLOW-ENTRY)*
|
|
// * **********
|
|
// flow_sequence_entry?
|
|
// *
|
|
// FLOW-SEQUENCE-END
|
|
// *****************
|
|
//
|
|
// flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
|
|
//
|
|
// *
|
|
func (parser *Parser) parseFlowSequenceEntry(event *Event, first bool) error {
|
|
if first {
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
parser.marks = append(parser.marks, token.StartMark)
|
|
parser.skipToken()
|
|
}
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type != FLOW_SEQUENCE_END_TOKEN {
|
|
if !first {
|
|
if token.Type == FLOW_ENTRY_TOKEN {
|
|
parser.skipToken()
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
context_mark := parser.marks[len(parser.marks)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
return formatParserErrorContext(
|
|
"while parsing a flow sequence", context_mark,
|
|
"did not find expected ',' or ']'", token.StartMark)
|
|
}
|
|
}
|
|
|
|
if token.Type == KEY_TOKEN {
|
|
parser.state = PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE
|
|
*event = Event{
|
|
Type: MAPPING_START_EVENT,
|
|
StartMark: token.StartMark,
|
|
EndMark: token.EndMark,
|
|
Implicit: true,
|
|
Style: Style(FLOW_MAPPING_STYLE),
|
|
}
|
|
parser.skipToken()
|
|
return nil
|
|
} else if token.Type != FLOW_SEQUENCE_END_TOKEN {
|
|
parser.states = append(parser.states, PARSE_FLOW_SEQUENCE_ENTRY_STATE)
|
|
return parser.parseNode(event, false, false)
|
|
}
|
|
}
|
|
|
|
parser.state = parser.states[len(parser.states)-1]
|
|
parser.states = parser.states[:len(parser.states)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
|
|
*event = Event{
|
|
Type: SEQUENCE_END_EVENT,
|
|
StartMark: token.StartMark,
|
|
EndMark: token.EndMark,
|
|
}
|
|
parser.setEventComments(event)
|
|
|
|
parser.skipToken()
|
|
return nil
|
|
}
|
|
|
|
// Parse the productions:
|
|
// flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
|
|
//
|
|
// *** *
|
|
func (parser *Parser) parseFlowSequenceEntryMappingKey(event *Event) error {
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type != VALUE_TOKEN &&
|
|
token.Type != FLOW_ENTRY_TOKEN &&
|
|
token.Type != FLOW_SEQUENCE_END_TOKEN {
|
|
parser.states = append(parser.states, PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE)
|
|
return parser.parseNode(event, false, false)
|
|
}
|
|
mark := token.EndMark
|
|
parser.skipToken()
|
|
parser.state = PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE
|
|
return parser.processEmptyScalar(event, mark)
|
|
}
|
|
|
|
// Parse the productions:
|
|
// flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
|
|
//
|
|
// ***** *
|
|
func (parser *Parser) parseFlowSequenceEntryMappingValue(event *Event) error {
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type == VALUE_TOKEN {
|
|
parser.skipToken()
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type != FLOW_ENTRY_TOKEN && token.Type != FLOW_SEQUENCE_END_TOKEN {
|
|
parser.states = append(parser.states, PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE)
|
|
return parser.parseNode(event, false, false)
|
|
}
|
|
}
|
|
parser.state = PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE
|
|
return parser.processEmptyScalar(event, token.StartMark)
|
|
}
|
|
|
|
// Parse the productions:
|
|
// flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
|
|
//
|
|
// *
|
|
func (parser *Parser) parseFlowSequenceEntryMappingEnd(event *Event) error {
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
parser.state = PARSE_FLOW_SEQUENCE_ENTRY_STATE
|
|
*event = Event{
|
|
Type: MAPPING_END_EVENT,
|
|
StartMark: token.StartMark,
|
|
EndMark: token.StartMark, // [Go] Shouldn't this be end_mark?
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Parse the productions:
|
|
// flow_mapping ::= FLOW-MAPPING-START
|
|
//
|
|
// ******************
|
|
// (flow_mapping_entry FLOW-ENTRY)*
|
|
// * **********
|
|
// flow_mapping_entry?
|
|
// ******************
|
|
// FLOW-MAPPING-END
|
|
// ****************
|
|
//
|
|
// flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
|
|
// - *** *
|
|
func (parser *Parser) parseFlowMappingKey(event *Event, first bool) error {
|
|
if first {
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
parser.marks = append(parser.marks, token.StartMark)
|
|
parser.skipToken()
|
|
}
|
|
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
|
|
if token.Type != FLOW_MAPPING_END_TOKEN {
|
|
if !first {
|
|
if token.Type == FLOW_ENTRY_TOKEN {
|
|
parser.skipToken()
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
context_mark := parser.marks[len(parser.marks)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
return formatParserErrorContext(
|
|
"while parsing a flow mapping", context_mark,
|
|
"did not find expected ',' or '}'", token.StartMark)
|
|
}
|
|
}
|
|
|
|
if token.Type == KEY_TOKEN {
|
|
parser.skipToken()
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type != VALUE_TOKEN &&
|
|
token.Type != FLOW_ENTRY_TOKEN &&
|
|
token.Type != FLOW_MAPPING_END_TOKEN {
|
|
parser.states = append(parser.states, PARSE_FLOW_MAPPING_VALUE_STATE)
|
|
return parser.parseNode(event, false, false)
|
|
} else {
|
|
parser.state = PARSE_FLOW_MAPPING_VALUE_STATE
|
|
return parser.processEmptyScalar(event, token.StartMark)
|
|
}
|
|
} else if token.Type != FLOW_MAPPING_END_TOKEN {
|
|
parser.states = append(parser.states, PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE)
|
|
return parser.parseNode(event, false, false)
|
|
}
|
|
}
|
|
|
|
parser.state = parser.states[len(parser.states)-1]
|
|
parser.states = parser.states[:len(parser.states)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
*event = Event{
|
|
Type: MAPPING_END_EVENT,
|
|
StartMark: token.StartMark,
|
|
EndMark: token.EndMark,
|
|
}
|
|
parser.setEventComments(event)
|
|
parser.skipToken()
|
|
return nil
|
|
}
|
|
|
|
// Parse the productions:
|
|
// flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
|
|
// - ***** *
|
|
func (parser *Parser) parseFlowMappingValue(event *Event, empty bool) error {
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if empty {
|
|
parser.state = PARSE_FLOW_MAPPING_KEY_STATE
|
|
return parser.processEmptyScalar(event, token.StartMark)
|
|
}
|
|
if token.Type == VALUE_TOKEN {
|
|
parser.skipToken()
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
if token.Type != FLOW_ENTRY_TOKEN && token.Type != FLOW_MAPPING_END_TOKEN {
|
|
parser.states = append(parser.states, PARSE_FLOW_MAPPING_KEY_STATE)
|
|
return parser.parseNode(event, false, false)
|
|
}
|
|
}
|
|
parser.state = PARSE_FLOW_MAPPING_KEY_STATE
|
|
return parser.processEmptyScalar(event, token.StartMark)
|
|
}
|
|
|
|
// Generate an empty scalar event.
|
|
func (parser *Parser) processEmptyScalar(event *Event, mark Mark) error {
|
|
*event = Event{
|
|
Type: SCALAR_EVENT,
|
|
StartMark: mark,
|
|
EndMark: mark,
|
|
Value: nil, // Empty
|
|
Implicit: true,
|
|
Style: Style(PLAIN_SCALAR_STYLE),
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var default_tag_directives = []TagDirective{
|
|
{[]byte("!"), []byte("!")},
|
|
{[]byte("!!"), []byte("tag:yaml.org,2002:")},
|
|
}
|
|
|
|
// Parse directives.
|
|
func (parser *Parser) processDirectives(version_directive_ref **VersionDirective, tag_directives_ref *[]TagDirective) error {
|
|
var version_directive *VersionDirective
|
|
var tag_directives []TagDirective
|
|
|
|
var token *Token
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
|
|
for token.Type == VERSION_DIRECTIVE_TOKEN || token.Type == TAG_DIRECTIVE_TOKEN {
|
|
switch token.Type {
|
|
case VERSION_DIRECTIVE_TOKEN:
|
|
if version_directive != nil {
|
|
return formatParserError(
|
|
"found duplicate %YAML directive", token.StartMark)
|
|
}
|
|
if token.major != 1 || token.minor != 1 {
|
|
return formatParserError(
|
|
"found incompatible YAML document", token.StartMark)
|
|
}
|
|
version_directive = &VersionDirective{
|
|
major: token.major,
|
|
minor: token.minor,
|
|
}
|
|
case TAG_DIRECTIVE_TOKEN:
|
|
value := TagDirective{
|
|
handle: token.Value,
|
|
prefix: token.prefix,
|
|
}
|
|
if err := parser.appendTagDirective(value, false, token.StartMark); err != nil {
|
|
return err
|
|
}
|
|
tag_directives = append(tag_directives, value)
|
|
}
|
|
|
|
parser.skipToken()
|
|
if err := parser.peekToken(&token); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
for i := range default_tag_directives {
|
|
if err := parser.appendTagDirective(default_tag_directives[i], true, token.StartMark); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if version_directive_ref != nil {
|
|
*version_directive_ref = version_directive
|
|
}
|
|
if tag_directives_ref != nil {
|
|
*tag_directives_ref = tag_directives
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Append a tag directive to the directives stack.
|
|
func (parser *Parser) appendTagDirective(value TagDirective, allow_duplicates bool, mark Mark) error {
|
|
for i := range parser.tag_directives {
|
|
if bytes.Equal(value.handle, parser.tag_directives[i].handle) {
|
|
if allow_duplicates {
|
|
return nil
|
|
}
|
|
return formatParserError("found duplicate %TAG directive", mark)
|
|
}
|
|
}
|
|
|
|
// [Go] I suspect the copy is unnecessary. This was likely done
|
|
// because there was no way to track ownership of the data.
|
|
value_copy := TagDirective{
|
|
handle: make([]byte, len(value.handle)),
|
|
prefix: make([]byte, len(value.prefix)),
|
|
}
|
|
copy(value_copy.handle, value.handle)
|
|
copy(value_copy.prefix, value.prefix)
|
|
parser.tag_directives = append(parser.tag_directives, value_copy)
|
|
return nil
|
|
}
|
|
|
|
// ParserGetEvents parses the YAML input and returns the generated event stream.
|
|
func ParserGetEvents(in []byte) (string, error) {
|
|
p := NewComposer(in)
|
|
defer p.Destroy()
|
|
var events strings.Builder
|
|
var event Event
|
|
for {
|
|
if err := p.Parser.Parse(&event); err != nil {
|
|
return "", err
|
|
}
|
|
formatted := formatEvent(&event)
|
|
events.WriteString(formatted)
|
|
if event.Type == STREAM_END_EVENT {
|
|
event.Delete()
|
|
break
|
|
}
|
|
event.Delete()
|
|
events.WriteByte('\n')
|
|
}
|
|
return events.String(), nil
|
|
}
|
|
|
|
func formatEvent(e *Event) string {
|
|
var b strings.Builder
|
|
switch e.Type {
|
|
case STREAM_START_EVENT:
|
|
b.WriteString("+STR")
|
|
case STREAM_END_EVENT:
|
|
b.WriteString("-STR")
|
|
case DOCUMENT_START_EVENT:
|
|
b.WriteString("+DOC")
|
|
if !e.Implicit {
|
|
b.WriteString(" ---")
|
|
}
|
|
case DOCUMENT_END_EVENT:
|
|
b.WriteString("-DOC")
|
|
if !e.Implicit {
|
|
b.WriteString(" ...")
|
|
}
|
|
case ALIAS_EVENT:
|
|
b.WriteString("=ALI *")
|
|
b.Write(e.Anchor)
|
|
case SCALAR_EVENT:
|
|
b.WriteString("=VAL")
|
|
if len(e.Anchor) > 0 {
|
|
b.WriteString(" &")
|
|
b.Write(e.Anchor)
|
|
}
|
|
if len(e.Tag) > 0 {
|
|
b.WriteString(" <")
|
|
b.Write(e.Tag)
|
|
b.WriteString(">")
|
|
}
|
|
switch e.ScalarStyle() {
|
|
case PLAIN_SCALAR_STYLE:
|
|
b.WriteString(" :")
|
|
case LITERAL_SCALAR_STYLE:
|
|
b.WriteString(" |")
|
|
case FOLDED_SCALAR_STYLE:
|
|
b.WriteString(" >")
|
|
case SINGLE_QUOTED_SCALAR_STYLE:
|
|
b.WriteString(" '")
|
|
case DOUBLE_QUOTED_SCALAR_STYLE:
|
|
b.WriteString(` "`)
|
|
}
|
|
// Escape special characters for consistent event output.
|
|
val := strings.NewReplacer(
|
|
`\`, `\\`,
|
|
"\n", `\n`,
|
|
"\t", `\t`,
|
|
).Replace(string(e.Value))
|
|
b.WriteString(val)
|
|
|
|
case SEQUENCE_START_EVENT:
|
|
b.WriteString("+SEQ")
|
|
if len(e.Anchor) > 0 {
|
|
b.WriteString(" &")
|
|
b.Write(e.Anchor)
|
|
}
|
|
if len(e.Tag) > 0 {
|
|
b.WriteString(" <")
|
|
b.Write(e.Tag)
|
|
b.WriteString(">")
|
|
}
|
|
if e.SequenceStyle() == FLOW_SEQUENCE_STYLE {
|
|
b.WriteString(" []")
|
|
}
|
|
case SEQUENCE_END_EVENT:
|
|
b.WriteString("-SEQ")
|
|
case MAPPING_START_EVENT:
|
|
b.WriteString("+MAP")
|
|
if len(e.Anchor) > 0 {
|
|
b.WriteString(" &")
|
|
b.Write(e.Anchor)
|
|
}
|
|
if len(e.Tag) > 0 {
|
|
b.WriteString(" <")
|
|
b.Write(e.Tag)
|
|
b.WriteString(">")
|
|
}
|
|
if e.MappingStyle() == FLOW_MAPPING_STYLE {
|
|
b.WriteString(" {}")
|
|
}
|
|
case MAPPING_END_EVENT:
|
|
b.WriteString("-MAP")
|
|
}
|
|
return b.String()
|
|
}
|