Function yaml_parser_parse_document_start

parserc.go:255–355

Parse the productions: implicit_document ::= block_node DOCUMENT-END* * explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* *************************

(parser *yaml_parser_t, event *yaml_event_t, implicit bool)

// explicit_document    ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
//                          *************************
func yaml_parser_parse_document_start(parser *yaml_parser_t, event *yaml_event_t, implicit bool) bool {

	token := peek_token(parser)
	if token == nil {
		return false
	}

	// Parse extra document end indicators.
	if !implicit {
		for token.typ == yaml_DOCUMENT_END_TOKEN {
			skip_token(parser)
			token = peek_token(parser)
			if token == nil {
				return false
			}
		}
	}

	if implicit && token.typ != yaml_VERSION_DIRECTIVE_TOKEN &&
		token.typ != yaml_TAG_DIRECTIVE_TOKEN &&
		token.typ != yaml_DOCUMENT_START_TOKEN &&
		token.typ != yaml_STREAM_END_TOKEN {
		// Parse an implicit document.
		if !yaml_parser_process_directives(parser, nil, nil) {
			return false
		}
		parser.states = append(parser.states, yaml_PARSE_DOCUMENT_END_STATE)
		parser.state = yaml_PARSE_BLOCK_NODE_STATE

		var head_comment []byte
		if len(parser.head_comment) > 0 {
			// [Go] Scan the header comment backwards, and if an empty line is found, break
			//      the header so the part before the last empty line goes into the
			//      document header, while the bottom of it goes into a follow up event.
			for i := len(parser.head_comment) - 1; i > 0; i-- {
				if parser.head_comment[i] == '\n' {
					if i == len(parser.head_comment)-1 {
						head_comment = parser.head_comment[:i]
						parser.head_comment = parser.head_comment[i+1:]
						break
					} else if parser.head_comment[i-1] == '\n' {
						head_comment = parser.head_comment[:i-1]
						parser.head_comment = parser.head_comment[i+1:]
						break
					}
				}
			}
		}

		*event = yaml_event_t{
			typ:        yaml_DOCUMENT_START_EVENT,
			start_mark: token.start_mark,
			end_mark:   token.end_mark,

			head_comment: head_comment,
		}

	} else if token.typ != yaml_STREAM_END_TOKEN {