1096 lines
34 KiB
Go
1096 lines
34 KiB
Go
package yaml
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import (
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"bytes"
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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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// Peek the next token in the token queue.
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func peek_token(parser *yaml_parser_t) *yaml_token_t {
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if parser.token_available || yaml_parser_fetch_more_tokens(parser) {
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return &parser.tokens[parser.tokens_head]
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}
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return nil
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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 skip_token(parser *yaml_parser_t) {
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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].typ == yaml_STREAM_END_TOKEN
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parser.tokens_head++
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}
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// Get the next event.
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func yaml_parser_parse(parser *yaml_parser_t, event *yaml_event_t) bool {
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// Erase the event object.
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*event = yaml_event_t{}
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// No events after the end of the stream or error.
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if parser.stream_end_produced || parser.error != yaml_NO_ERROR || parser.state == yaml_PARSE_END_STATE {
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return true
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}
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// Generate the next event.
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return yaml_parser_state_machine(parser, event)
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}
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// Set parser error.
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func yaml_parser_set_parser_error(parser *yaml_parser_t, problem string, problem_mark yaml_mark_t) bool {
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parser.error = yaml_PARSER_ERROR
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parser.problem = problem
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parser.problem_mark = problem_mark
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return false
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}
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func yaml_parser_set_parser_error_context(parser *yaml_parser_t, context string, context_mark yaml_mark_t, problem string, problem_mark yaml_mark_t) bool {
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parser.error = yaml_PARSER_ERROR
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parser.context = context
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parser.context_mark = context_mark
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parser.problem = problem
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parser.problem_mark = problem_mark
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return false
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}
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// State dispatcher.
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func yaml_parser_state_machine(parser *yaml_parser_t, event *yaml_event_t) bool {
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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 yaml_PARSE_STREAM_START_STATE:
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return yaml_parser_parse_stream_start(parser, event)
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case yaml_PARSE_IMPLICIT_DOCUMENT_START_STATE:
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return yaml_parser_parse_document_start(parser, event, true)
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case yaml_PARSE_DOCUMENT_START_STATE:
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return yaml_parser_parse_document_start(parser, event, false)
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case yaml_PARSE_DOCUMENT_CONTENT_STATE:
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return yaml_parser_parse_document_content(parser, event)
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case yaml_PARSE_DOCUMENT_END_STATE:
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return yaml_parser_parse_document_end(parser, event)
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case yaml_PARSE_BLOCK_NODE_STATE:
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return yaml_parser_parse_node(parser, event, true, false)
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case yaml_PARSE_BLOCK_NODE_OR_INDENTLESS_SEQUENCE_STATE:
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return yaml_parser_parse_node(parser, event, true, true)
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case yaml_PARSE_FLOW_NODE_STATE:
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return yaml_parser_parse_node(parser, event, false, false)
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case yaml_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE:
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return yaml_parser_parse_block_sequence_entry(parser, event, true)
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case yaml_PARSE_BLOCK_SEQUENCE_ENTRY_STATE:
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return yaml_parser_parse_block_sequence_entry(parser, event, false)
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case yaml_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE:
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return yaml_parser_parse_indentless_sequence_entry(parser, event)
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case yaml_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE:
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return yaml_parser_parse_block_mapping_key(parser, event, true)
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case yaml_PARSE_BLOCK_MAPPING_KEY_STATE:
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return yaml_parser_parse_block_mapping_key(parser, event, false)
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case yaml_PARSE_BLOCK_MAPPING_VALUE_STATE:
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return yaml_parser_parse_block_mapping_value(parser, event)
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case yaml_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE:
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return yaml_parser_parse_flow_sequence_entry(parser, event, true)
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case yaml_PARSE_FLOW_SEQUENCE_ENTRY_STATE:
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return yaml_parser_parse_flow_sequence_entry(parser, event, false)
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case yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE:
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return yaml_parser_parse_flow_sequence_entry_mapping_key(parser, event)
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case yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE:
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return yaml_parser_parse_flow_sequence_entry_mapping_value(parser, event)
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case yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE:
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return yaml_parser_parse_flow_sequence_entry_mapping_end(parser, event)
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case yaml_PARSE_FLOW_MAPPING_FIRST_KEY_STATE:
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return yaml_parser_parse_flow_mapping_key(parser, event, true)
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case yaml_PARSE_FLOW_MAPPING_KEY_STATE:
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return yaml_parser_parse_flow_mapping_key(parser, event, false)
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case yaml_PARSE_FLOW_MAPPING_VALUE_STATE:
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return yaml_parser_parse_flow_mapping_value(parser, event, false)
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case yaml_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE:
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return yaml_parser_parse_flow_mapping_value(parser, 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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func yaml_parser_parse_stream_start(parser *yaml_parser_t, event *yaml_event_t) bool {
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token := peek_token(parser)
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if token == nil {
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return false
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}
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if token.typ != yaml_STREAM_START_TOKEN {
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return yaml_parser_set_parser_error(parser, "did not find expected <stream-start>", token.start_mark)
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}
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parser.state = yaml_PARSE_IMPLICIT_DOCUMENT_START_STATE
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*event = yaml_event_t{
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typ: yaml_STREAM_START_EVENT,
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start_mark: token.start_mark,
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end_mark: token.end_mark,
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encoding: token.encoding,
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}
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skip_token(parser)
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return true
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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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// explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
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// *************************
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func yaml_parser_parse_document_start(parser *yaml_parser_t, event *yaml_event_t, implicit bool) bool {
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token := peek_token(parser)
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if token == nil {
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return false
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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.typ == yaml_DOCUMENT_END_TOKEN {
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skip_token(parser)
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token = peek_token(parser)
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if token == nil {
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return false
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}
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}
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}
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if implicit && token.typ != yaml_VERSION_DIRECTIVE_TOKEN &&
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token.typ != yaml_TAG_DIRECTIVE_TOKEN &&
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token.typ != yaml_DOCUMENT_START_TOKEN &&
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token.typ != yaml_STREAM_END_TOKEN {
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// Parse an implicit document.
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if !yaml_parser_process_directives(parser, nil, nil) {
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return false
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}
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parser.states = append(parser.states, yaml_PARSE_DOCUMENT_END_STATE)
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parser.state = yaml_PARSE_BLOCK_NODE_STATE
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*event = yaml_event_t{
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typ: yaml_DOCUMENT_START_EVENT,
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start_mark: token.start_mark,
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end_mark: token.end_mark,
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}
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} else if token.typ != yaml_STREAM_END_TOKEN {
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// Parse an explicit document.
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var version_directive *yaml_version_directive_t
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var tag_directives []yaml_tag_directive_t
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start_mark := token.start_mark
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if !yaml_parser_process_directives(parser, &version_directive, &tag_directives) {
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return false
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}
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token = peek_token(parser)
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if token == nil {
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return false
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}
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if token.typ != yaml_DOCUMENT_START_TOKEN {
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yaml_parser_set_parser_error(parser,
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"did not find expected <document start>", token.start_mark)
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return false
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}
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parser.states = append(parser.states, yaml_PARSE_DOCUMENT_END_STATE)
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parser.state = yaml_PARSE_DOCUMENT_CONTENT_STATE
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end_mark := token.end_mark
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*event = yaml_event_t{
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typ: yaml_DOCUMENT_START_EVENT,
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start_mark: start_mark,
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end_mark: end_mark,
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version_directive: version_directive,
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tag_directives: tag_directives,
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implicit: false,
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}
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skip_token(parser)
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} else {
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// Parse the stream end.
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parser.state = yaml_PARSE_END_STATE
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*event = yaml_event_t{
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typ: yaml_STREAM_END_EVENT,
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start_mark: token.start_mark,
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end_mark: token.end_mark,
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}
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skip_token(parser)
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}
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return true
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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 yaml_parser_parse_document_content(parser *yaml_parser_t, event *yaml_event_t) bool {
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token := peek_token(parser)
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if token == nil {
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return false
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}
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if token.typ == yaml_VERSION_DIRECTIVE_TOKEN ||
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token.typ == yaml_TAG_DIRECTIVE_TOKEN ||
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token.typ == yaml_DOCUMENT_START_TOKEN ||
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token.typ == yaml_DOCUMENT_END_TOKEN ||
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token.typ == yaml_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 yaml_parser_process_empty_scalar(parser, event,
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token.start_mark)
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}
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return yaml_parser_parse_node(parser, 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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// explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
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//
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func yaml_parser_parse_document_end(parser *yaml_parser_t, event *yaml_event_t) bool {
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token := peek_token(parser)
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if token == nil {
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return false
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}
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start_mark := token.start_mark
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end_mark := token.start_mark
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implicit := true
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if token.typ == yaml_DOCUMENT_END_TOKEN {
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end_mark = token.end_mark
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skip_token(parser)
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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 = yaml_PARSE_DOCUMENT_START_STATE
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*event = yaml_event_t{
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typ: yaml_DOCUMENT_END_EVENT,
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start_mark: start_mark,
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end_mark: end_mark,
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implicit: implicit,
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}
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return true
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}
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// Parse the productions:
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// block_node_or_indentless_sequence ::=
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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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// block_node ::= ALIAS
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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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// flow_node ::= ALIAS
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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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// properties ::= TAG ANCHOR? | ANCHOR TAG?
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// *************************
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// block_content ::= block_collection | flow_collection | SCALAR
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// ******
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// flow_content ::= flow_collection | SCALAR
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// ******
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func yaml_parser_parse_node(parser *yaml_parser_t, event *yaml_event_t, block, indentless_sequence bool) bool {
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//defer trace("yaml_parser_parse_node", "block:", block, "indentless_sequence:", indentless_sequence)()
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token := peek_token(parser)
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if token == nil {
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return false
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}
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if token.typ == yaml_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 = yaml_event_t{
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typ: yaml_ALIAS_EVENT,
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start_mark: token.start_mark,
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end_mark: token.end_mark,
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anchor: token.value,
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}
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skip_token(parser)
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return true
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}
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start_mark := token.start_mark
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end_mark := token.start_mark
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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 yaml_mark_t
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if token.typ == yaml_ANCHOR_TOKEN {
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anchor = token.value
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start_mark = token.start_mark
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end_mark = token.end_mark
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skip_token(parser)
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token = peek_token(parser)
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if token == nil {
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return false
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}
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if token.typ == yaml_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.start_mark
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end_mark = token.end_mark
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skip_token(parser)
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token = peek_token(parser)
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if token == nil {
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return false
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}
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}
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} else if token.typ == yaml_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.start_mark
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tag_mark = token.start_mark
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end_mark = token.end_mark
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skip_token(parser)
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token = peek_token(parser)
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if token == nil {
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return false
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}
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if token.typ == yaml_ANCHOR_TOKEN {
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anchor = token.value
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end_mark = token.end_mark
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skip_token(parser)
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token = peek_token(parser)
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if token == nil {
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return false
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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 {
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if len(tag_handle) == 0 {
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tag = tag_suffix
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tag_suffix = nil
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} else {
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for i := range parser.tag_directives {
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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
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}
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}
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if len(tag) == 0 {
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yaml_parser_set_parser_error_context(parser,
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"while parsing a node", start_mark,
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"found undefined tag handle", tag_mark)
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return false
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}
|
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}
|
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}
|
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implicit := len(tag) == 0
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if indentless_sequence && token.typ == yaml_BLOCK_ENTRY_TOKEN {
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end_mark = token.end_mark
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parser.state = yaml_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE
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*event = yaml_event_t{
|
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typ: yaml_SEQUENCE_START_EVENT,
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start_mark: start_mark,
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end_mark: end_mark,
|
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anchor: anchor,
|
|
tag: tag,
|
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implicit: implicit,
|
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style: yaml_style_t(yaml_BLOCK_SEQUENCE_STYLE),
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}
|
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return true
|
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}
|
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if token.typ == yaml_SCALAR_TOKEN {
|
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var plain_implicit, quoted_implicit bool
|
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end_mark = token.end_mark
|
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if (len(tag) == 0 && token.style == yaml_PLAIN_SCALAR_STYLE) || (len(tag) == 1 && tag[0] == '!') {
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plain_implicit = true
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} else if len(tag) == 0 {
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quoted_implicit = true
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}
|
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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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|
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*event = yaml_event_t{
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typ: yaml_SCALAR_EVENT,
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start_mark: start_mark,
|
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end_mark: end_mark,
|
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anchor: anchor,
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tag: tag,
|
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value: token.value,
|
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implicit: plain_implicit,
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quoted_implicit: quoted_implicit,
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style: yaml_style_t(token.style),
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}
|
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skip_token(parser)
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return true
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}
|
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if token.typ == yaml_FLOW_SEQUENCE_START_TOKEN {
|
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// [Go] Some of the events below can be merged as they differ only on style.
|
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end_mark = token.end_mark
|
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parser.state = yaml_PARSE_FLOW_SEQUENCE_FIRST_ENTRY_STATE
|
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*event = yaml_event_t{
|
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typ: yaml_SEQUENCE_START_EVENT,
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start_mark: start_mark,
|
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end_mark: end_mark,
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anchor: anchor,
|
|
tag: tag,
|
|
implicit: implicit,
|
|
style: yaml_style_t(yaml_FLOW_SEQUENCE_STYLE),
|
|
}
|
|
return true
|
|
}
|
|
if token.typ == yaml_FLOW_MAPPING_START_TOKEN {
|
|
end_mark = token.end_mark
|
|
parser.state = yaml_PARSE_FLOW_MAPPING_FIRST_KEY_STATE
|
|
*event = yaml_event_t{
|
|
typ: yaml_MAPPING_START_EVENT,
|
|
start_mark: start_mark,
|
|
end_mark: end_mark,
|
|
anchor: anchor,
|
|
tag: tag,
|
|
implicit: implicit,
|
|
style: yaml_style_t(yaml_FLOW_MAPPING_STYLE),
|
|
}
|
|
return true
|
|
}
|
|
if block && token.typ == yaml_BLOCK_SEQUENCE_START_TOKEN {
|
|
end_mark = token.end_mark
|
|
parser.state = yaml_PARSE_BLOCK_SEQUENCE_FIRST_ENTRY_STATE
|
|
*event = yaml_event_t{
|
|
typ: yaml_SEQUENCE_START_EVENT,
|
|
start_mark: start_mark,
|
|
end_mark: end_mark,
|
|
anchor: anchor,
|
|
tag: tag,
|
|
implicit: implicit,
|
|
style: yaml_style_t(yaml_BLOCK_SEQUENCE_STYLE),
|
|
}
|
|
return true
|
|
}
|
|
if block && token.typ == yaml_BLOCK_MAPPING_START_TOKEN {
|
|
end_mark = token.end_mark
|
|
parser.state = yaml_PARSE_BLOCK_MAPPING_FIRST_KEY_STATE
|
|
*event = yaml_event_t{
|
|
typ: yaml_MAPPING_START_EVENT,
|
|
start_mark: start_mark,
|
|
end_mark: end_mark,
|
|
anchor: anchor,
|
|
tag: tag,
|
|
implicit: implicit,
|
|
style: yaml_style_t(yaml_BLOCK_MAPPING_STYLE),
|
|
}
|
|
return true
|
|
}
|
|
if len(anchor) > 0 || len(tag) > 0 {
|
|
parser.state = parser.states[len(parser.states)-1]
|
|
parser.states = parser.states[:len(parser.states)-1]
|
|
|
|
*event = yaml_event_t{
|
|
typ: yaml_SCALAR_EVENT,
|
|
start_mark: start_mark,
|
|
end_mark: end_mark,
|
|
anchor: anchor,
|
|
tag: tag,
|
|
implicit: implicit,
|
|
quoted_implicit: false,
|
|
style: yaml_style_t(yaml_PLAIN_SCALAR_STYLE),
|
|
}
|
|
return true
|
|
}
|
|
|
|
context := "while parsing a flow node"
|
|
if block {
|
|
context = "while parsing a block node"
|
|
}
|
|
yaml_parser_set_parser_error_context(parser, context, start_mark,
|
|
"did not find expected node content", token.start_mark)
|
|
return false
|
|
}
|
|
|
|
// Parse the productions:
|
|
// block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END
|
|
// ******************** *********** * *********
|
|
//
|
|
func yaml_parser_parse_block_sequence_entry(parser *yaml_parser_t, event *yaml_event_t, first bool) bool {
|
|
if first {
|
|
token := peek_token(parser)
|
|
parser.marks = append(parser.marks, token.start_mark)
|
|
skip_token(parser)
|
|
}
|
|
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
|
|
if token.typ == yaml_BLOCK_ENTRY_TOKEN {
|
|
mark := token.end_mark
|
|
skip_token(parser)
|
|
token = peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ != yaml_BLOCK_ENTRY_TOKEN && token.typ != yaml_BLOCK_END_TOKEN {
|
|
parser.states = append(parser.states, yaml_PARSE_BLOCK_SEQUENCE_ENTRY_STATE)
|
|
return yaml_parser_parse_node(parser, event, true, false)
|
|
} else {
|
|
parser.state = yaml_PARSE_BLOCK_SEQUENCE_ENTRY_STATE
|
|
return yaml_parser_process_empty_scalar(parser, event, mark)
|
|
}
|
|
}
|
|
if token.typ == yaml_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 = yaml_event_t{
|
|
typ: yaml_SEQUENCE_END_EVENT,
|
|
start_mark: token.start_mark,
|
|
end_mark: token.end_mark,
|
|
}
|
|
|
|
skip_token(parser)
|
|
return true
|
|
}
|
|
|
|
context_mark := parser.marks[len(parser.marks)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
return yaml_parser_set_parser_error_context(parser,
|
|
"while parsing a block collection", context_mark,
|
|
"did not find expected '-' indicator", token.start_mark)
|
|
}
|
|
|
|
// Parse the productions:
|
|
// indentless_sequence ::= (BLOCK-ENTRY block_node?)+
|
|
// *********** *
|
|
func yaml_parser_parse_indentless_sequence_entry(parser *yaml_parser_t, event *yaml_event_t) bool {
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
|
|
if token.typ == yaml_BLOCK_ENTRY_TOKEN {
|
|
mark := token.end_mark
|
|
skip_token(parser)
|
|
token = peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ != yaml_BLOCK_ENTRY_TOKEN &&
|
|
token.typ != yaml_KEY_TOKEN &&
|
|
token.typ != yaml_VALUE_TOKEN &&
|
|
token.typ != yaml_BLOCK_END_TOKEN {
|
|
parser.states = append(parser.states, yaml_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE)
|
|
return yaml_parser_parse_node(parser, event, true, false)
|
|
}
|
|
parser.state = yaml_PARSE_INDENTLESS_SEQUENCE_ENTRY_STATE
|
|
return yaml_parser_process_empty_scalar(parser, event, mark)
|
|
}
|
|
parser.state = parser.states[len(parser.states)-1]
|
|
parser.states = parser.states[:len(parser.states)-1]
|
|
|
|
*event = yaml_event_t{
|
|
typ: yaml_SEQUENCE_END_EVENT,
|
|
start_mark: token.start_mark,
|
|
end_mark: token.start_mark, // [Go] Shouldn't this be token.end_mark?
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Parse the productions:
|
|
// block_mapping ::= BLOCK-MAPPING_START
|
|
// *******************
|
|
// ((KEY block_node_or_indentless_sequence?)?
|
|
// *** *
|
|
// (VALUE block_node_or_indentless_sequence?)?)*
|
|
//
|
|
// BLOCK-END
|
|
// *********
|
|
//
|
|
func yaml_parser_parse_block_mapping_key(parser *yaml_parser_t, event *yaml_event_t, first bool) bool {
|
|
if first {
|
|
token := peek_token(parser)
|
|
parser.marks = append(parser.marks, token.start_mark)
|
|
skip_token(parser)
|
|
}
|
|
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
|
|
if token.typ == yaml_KEY_TOKEN {
|
|
mark := token.end_mark
|
|
skip_token(parser)
|
|
token = peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ != yaml_KEY_TOKEN &&
|
|
token.typ != yaml_VALUE_TOKEN &&
|
|
token.typ != yaml_BLOCK_END_TOKEN {
|
|
parser.states = append(parser.states, yaml_PARSE_BLOCK_MAPPING_VALUE_STATE)
|
|
return yaml_parser_parse_node(parser, event, true, true)
|
|
} else {
|
|
parser.state = yaml_PARSE_BLOCK_MAPPING_VALUE_STATE
|
|
return yaml_parser_process_empty_scalar(parser, event, mark)
|
|
}
|
|
} else if token.typ == yaml_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 = yaml_event_t{
|
|
typ: yaml_MAPPING_END_EVENT,
|
|
start_mark: token.start_mark,
|
|
end_mark: token.end_mark,
|
|
}
|
|
skip_token(parser)
|
|
return true
|
|
}
|
|
|
|
context_mark := parser.marks[len(parser.marks)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
return yaml_parser_set_parser_error_context(parser,
|
|
"while parsing a block mapping", context_mark,
|
|
"did not find expected key", token.start_mark)
|
|
}
|
|
|
|
// Parse the productions:
|
|
// block_mapping ::= BLOCK-MAPPING_START
|
|
//
|
|
// ((KEY block_node_or_indentless_sequence?)?
|
|
//
|
|
// (VALUE block_node_or_indentless_sequence?)?)*
|
|
// ***** *
|
|
// BLOCK-END
|
|
//
|
|
//
|
|
func yaml_parser_parse_block_mapping_value(parser *yaml_parser_t, event *yaml_event_t) bool {
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ == yaml_VALUE_TOKEN {
|
|
mark := token.end_mark
|
|
skip_token(parser)
|
|
token = peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ != yaml_KEY_TOKEN &&
|
|
token.typ != yaml_VALUE_TOKEN &&
|
|
token.typ != yaml_BLOCK_END_TOKEN {
|
|
parser.states = append(parser.states, yaml_PARSE_BLOCK_MAPPING_KEY_STATE)
|
|
return yaml_parser_parse_node(parser, event, true, true)
|
|
}
|
|
parser.state = yaml_PARSE_BLOCK_MAPPING_KEY_STATE
|
|
return yaml_parser_process_empty_scalar(parser, event, mark)
|
|
}
|
|
parser.state = yaml_PARSE_BLOCK_MAPPING_KEY_STATE
|
|
return yaml_parser_process_empty_scalar(parser, event, token.start_mark)
|
|
}
|
|
|
|
// 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 yaml_parser_parse_flow_sequence_entry(parser *yaml_parser_t, event *yaml_event_t, first bool) bool {
|
|
if first {
|
|
token := peek_token(parser)
|
|
parser.marks = append(parser.marks, token.start_mark)
|
|
skip_token(parser)
|
|
}
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ != yaml_FLOW_SEQUENCE_END_TOKEN {
|
|
if !first {
|
|
if token.typ == yaml_FLOW_ENTRY_TOKEN {
|
|
skip_token(parser)
|
|
token = peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
} else {
|
|
context_mark := parser.marks[len(parser.marks)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
return yaml_parser_set_parser_error_context(parser,
|
|
"while parsing a flow sequence", context_mark,
|
|
"did not find expected ',' or ']'", token.start_mark)
|
|
}
|
|
}
|
|
|
|
if token.typ == yaml_KEY_TOKEN {
|
|
parser.state = yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_KEY_STATE
|
|
*event = yaml_event_t{
|
|
typ: yaml_MAPPING_START_EVENT,
|
|
start_mark: token.start_mark,
|
|
end_mark: token.end_mark,
|
|
implicit: true,
|
|
style: yaml_style_t(yaml_FLOW_MAPPING_STYLE),
|
|
}
|
|
skip_token(parser)
|
|
return true
|
|
} else if token.typ != yaml_FLOW_SEQUENCE_END_TOKEN {
|
|
parser.states = append(parser.states, yaml_PARSE_FLOW_SEQUENCE_ENTRY_STATE)
|
|
return yaml_parser_parse_node(parser, 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 = yaml_event_t{
|
|
typ: yaml_SEQUENCE_END_EVENT,
|
|
start_mark: token.start_mark,
|
|
end_mark: token.end_mark,
|
|
}
|
|
|
|
skip_token(parser)
|
|
return true
|
|
}
|
|
|
|
//
|
|
// Parse the productions:
|
|
// flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
|
|
// *** *
|
|
//
|
|
func yaml_parser_parse_flow_sequence_entry_mapping_key(parser *yaml_parser_t, event *yaml_event_t) bool {
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ != yaml_VALUE_TOKEN &&
|
|
token.typ != yaml_FLOW_ENTRY_TOKEN &&
|
|
token.typ != yaml_FLOW_SEQUENCE_END_TOKEN {
|
|
parser.states = append(parser.states, yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE)
|
|
return yaml_parser_parse_node(parser, event, false, false)
|
|
}
|
|
mark := token.end_mark
|
|
skip_token(parser)
|
|
parser.state = yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_VALUE_STATE
|
|
return yaml_parser_process_empty_scalar(parser, event, mark)
|
|
}
|
|
|
|
// Parse the productions:
|
|
// flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
|
|
// ***** *
|
|
//
|
|
func yaml_parser_parse_flow_sequence_entry_mapping_value(parser *yaml_parser_t, event *yaml_event_t) bool {
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ == yaml_VALUE_TOKEN {
|
|
skip_token(parser)
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ != yaml_FLOW_ENTRY_TOKEN && token.typ != yaml_FLOW_SEQUENCE_END_TOKEN {
|
|
parser.states = append(parser.states, yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE)
|
|
return yaml_parser_parse_node(parser, event, false, false)
|
|
}
|
|
}
|
|
parser.state = yaml_PARSE_FLOW_SEQUENCE_ENTRY_MAPPING_END_STATE
|
|
return yaml_parser_process_empty_scalar(parser, event, token.start_mark)
|
|
}
|
|
|
|
// Parse the productions:
|
|
// flow_sequence_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
|
|
// *
|
|
//
|
|
func yaml_parser_parse_flow_sequence_entry_mapping_end(parser *yaml_parser_t, event *yaml_event_t) bool {
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
parser.state = yaml_PARSE_FLOW_SEQUENCE_ENTRY_STATE
|
|
*event = yaml_event_t{
|
|
typ: yaml_MAPPING_END_EVENT,
|
|
start_mark: token.start_mark,
|
|
end_mark: token.start_mark, // [Go] Shouldn't this be end_mark?
|
|
}
|
|
return true
|
|
}
|
|
|
|
// 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 yaml_parser_parse_flow_mapping_key(parser *yaml_parser_t, event *yaml_event_t, first bool) bool {
|
|
if first {
|
|
token := peek_token(parser)
|
|
parser.marks = append(parser.marks, token.start_mark)
|
|
skip_token(parser)
|
|
}
|
|
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
|
|
if token.typ != yaml_FLOW_MAPPING_END_TOKEN {
|
|
if !first {
|
|
if token.typ == yaml_FLOW_ENTRY_TOKEN {
|
|
skip_token(parser)
|
|
token = peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
} else {
|
|
context_mark := parser.marks[len(parser.marks)-1]
|
|
parser.marks = parser.marks[:len(parser.marks)-1]
|
|
return yaml_parser_set_parser_error_context(parser,
|
|
"while parsing a flow mapping", context_mark,
|
|
"did not find expected ',' or '}'", token.start_mark)
|
|
}
|
|
}
|
|
|
|
if token.typ == yaml_KEY_TOKEN {
|
|
skip_token(parser)
|
|
token = peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ != yaml_VALUE_TOKEN &&
|
|
token.typ != yaml_FLOW_ENTRY_TOKEN &&
|
|
token.typ != yaml_FLOW_MAPPING_END_TOKEN {
|
|
parser.states = append(parser.states, yaml_PARSE_FLOW_MAPPING_VALUE_STATE)
|
|
return yaml_parser_parse_node(parser, event, false, false)
|
|
} else {
|
|
parser.state = yaml_PARSE_FLOW_MAPPING_VALUE_STATE
|
|
return yaml_parser_process_empty_scalar(parser, event, token.start_mark)
|
|
}
|
|
} else if token.typ != yaml_FLOW_MAPPING_END_TOKEN {
|
|
parser.states = append(parser.states, yaml_PARSE_FLOW_MAPPING_EMPTY_VALUE_STATE)
|
|
return yaml_parser_parse_node(parser, 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 = yaml_event_t{
|
|
typ: yaml_MAPPING_END_EVENT,
|
|
start_mark: token.start_mark,
|
|
end_mark: token.end_mark,
|
|
}
|
|
skip_token(parser)
|
|
return true
|
|
}
|
|
|
|
// Parse the productions:
|
|
// flow_mapping_entry ::= flow_node | KEY flow_node? (VALUE flow_node?)?
|
|
// * ***** *
|
|
//
|
|
func yaml_parser_parse_flow_mapping_value(parser *yaml_parser_t, event *yaml_event_t, empty bool) bool {
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if empty {
|
|
parser.state = yaml_PARSE_FLOW_MAPPING_KEY_STATE
|
|
return yaml_parser_process_empty_scalar(parser, event, token.start_mark)
|
|
}
|
|
if token.typ == yaml_VALUE_TOKEN {
|
|
skip_token(parser)
|
|
token = peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
if token.typ != yaml_FLOW_ENTRY_TOKEN && token.typ != yaml_FLOW_MAPPING_END_TOKEN {
|
|
parser.states = append(parser.states, yaml_PARSE_FLOW_MAPPING_KEY_STATE)
|
|
return yaml_parser_parse_node(parser, event, false, false)
|
|
}
|
|
}
|
|
parser.state = yaml_PARSE_FLOW_MAPPING_KEY_STATE
|
|
return yaml_parser_process_empty_scalar(parser, event, token.start_mark)
|
|
}
|
|
|
|
// Generate an empty scalar event.
|
|
func yaml_parser_process_empty_scalar(parser *yaml_parser_t, event *yaml_event_t, mark yaml_mark_t) bool {
|
|
*event = yaml_event_t{
|
|
typ: yaml_SCALAR_EVENT,
|
|
start_mark: mark,
|
|
end_mark: mark,
|
|
value: nil, // Empty
|
|
implicit: true,
|
|
style: yaml_style_t(yaml_PLAIN_SCALAR_STYLE),
|
|
}
|
|
return true
|
|
}
|
|
|
|
var default_tag_directives = []yaml_tag_directive_t{
|
|
{[]byte("!"), []byte("!")},
|
|
{[]byte("!!"), []byte("tag:yaml.org,2002:")},
|
|
}
|
|
|
|
// Parse directives.
|
|
func yaml_parser_process_directives(parser *yaml_parser_t,
|
|
version_directive_ref **yaml_version_directive_t,
|
|
tag_directives_ref *[]yaml_tag_directive_t) bool {
|
|
|
|
var version_directive *yaml_version_directive_t
|
|
var tag_directives []yaml_tag_directive_t
|
|
|
|
token := peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
|
|
for token.typ == yaml_VERSION_DIRECTIVE_TOKEN || token.typ == yaml_TAG_DIRECTIVE_TOKEN {
|
|
if token.typ == yaml_VERSION_DIRECTIVE_TOKEN {
|
|
if version_directive != nil {
|
|
yaml_parser_set_parser_error(parser,
|
|
"found duplicate %YAML directive", token.start_mark)
|
|
return false
|
|
}
|
|
if token.major != 1 || token.minor != 1 {
|
|
yaml_parser_set_parser_error(parser,
|
|
"found incompatible YAML document", token.start_mark)
|
|
return false
|
|
}
|
|
version_directive = &yaml_version_directive_t{
|
|
major: token.major,
|
|
minor: token.minor,
|
|
}
|
|
} else if token.typ == yaml_TAG_DIRECTIVE_TOKEN {
|
|
value := yaml_tag_directive_t{
|
|
handle: token.value,
|
|
prefix: token.prefix,
|
|
}
|
|
if !yaml_parser_append_tag_directive(parser, value, false, token.start_mark) {
|
|
return false
|
|
}
|
|
tag_directives = append(tag_directives, value)
|
|
}
|
|
|
|
skip_token(parser)
|
|
token = peek_token(parser)
|
|
if token == nil {
|
|
return false
|
|
}
|
|
}
|
|
|
|
for i := range default_tag_directives {
|
|
if !yaml_parser_append_tag_directive(parser, default_tag_directives[i], true, token.start_mark) {
|
|
return false
|
|
}
|
|
}
|
|
|
|
if version_directive_ref != nil {
|
|
*version_directive_ref = version_directive
|
|
}
|
|
if tag_directives_ref != nil {
|
|
*tag_directives_ref = tag_directives
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Append a tag directive to the directives stack.
|
|
func yaml_parser_append_tag_directive(parser *yaml_parser_t, value yaml_tag_directive_t, allow_duplicates bool, mark yaml_mark_t) bool {
|
|
for i := range parser.tag_directives {
|
|
if bytes.Equal(value.handle, parser.tag_directives[i].handle) {
|
|
if allow_duplicates {
|
|
return true
|
|
}
|
|
return yaml_parser_set_parser_error(parser, "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 := yaml_tag_directive_t{
|
|
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 true
|
|
}
|