func yaml_parser_parse_document_start()

in yaml/parserc.go [224:302]

• 67 lines of code
• 15 McCabe index (conditional complexity)

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

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

	} else if token.typ != yaml_STREAM_END_TOKEN {
		// Parse an explicit document.
		var version_directive *yaml_version_directive_t
		var tag_directives []yaml_tag_directive_t
		start_mark := token.start_mark
		if !yaml_parser_process_directives(parser, &version_directive, &tag_directives) {
			return false
		}
		token = peek_token(parser)
		if token == nil {
			return false
		}
		if token.typ != yaml_DOCUMENT_START_TOKEN {
			yaml_parser_set_parser_error(parser,
				"did not find expected <document start>", token.start_mark)
			return false
		}
		parser.states = append(parser.states, yaml_PARSE_DOCUMENT_END_STATE)
		parser.state = yaml_PARSE_DOCUMENT_CONTENT_STATE
		end_mark := token.end_mark

		*event = yaml_event_t{
			typ:               yaml_DOCUMENT_START_EVENT,
			start_mark:        start_mark,
			end_mark:          end_mark,
			version_directive: version_directive,
			tag_directives:    tag_directives,
			implicit:          false,
		}
		skip_token(parser)

	} else {
		// Parse the stream end.
		parser.state = yaml_PARSE_END_STATE
		*event = yaml_event_t{
			typ:        yaml_STREAM_END_EVENT,
			start_mark: token.start_mark,
			end_mark:   token.end_mark,
		}
		skip_token(parser)
	}

	return true
}