func yaml_parser_scan_directive()

in yaml/scannerc.go [1524:1615]

• 68 lines of code
• 19 McCabe index (conditional complexity)

func yaml_parser_scan_directive(parser *yaml_parser_t, token *yaml_token_t) bool {
	// Eat '%'.
	start_mark := parser.mark
	skip(parser)

	// Scan the directive name.
	var name []byte
	if !yaml_parser_scan_directive_name(parser, start_mark, &name) {
		return false
	}

	// Is it a YAML directive?
	if bytes.Equal(name, []byte("YAML")) {
		// Scan the VERSION directive value.
		var major, minor int8
		if !yaml_parser_scan_version_directive_value(parser, start_mark, &major, &minor) {
			return false
		}
		end_mark := parser.mark

		// Create a VERSION-DIRECTIVE token.
		*token = yaml_token_t{
			typ:        yaml_VERSION_DIRECTIVE_TOKEN,
			start_mark: start_mark,
			end_mark:   end_mark,
			major:      major,
			minor:      minor,
		}

		// Is it a TAG directive?
	} else if bytes.Equal(name, []byte("TAG")) {
		// Scan the TAG directive value.
		var handle, prefix []byte
		if !yaml_parser_scan_tag_directive_value(parser, start_mark, &handle, &prefix) {
			return false
		}
		end_mark := parser.mark

		// Create a TAG-DIRECTIVE token.
		*token = yaml_token_t{
			typ:        yaml_TAG_DIRECTIVE_TOKEN,
			start_mark: start_mark,
			end_mark:   end_mark,
			value:      handle,
			prefix:     prefix,
		}

		// Unknown directive.
	} else {
		yaml_parser_set_scanner_error(parser, "while scanning a directive",
			start_mark, "found uknown directive name")
		return false
	}

	// Eat the rest of the line including any comments.
	if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) {
		return false
	}

	for is_blank(parser.buffer, parser.buffer_pos) {
		skip(parser)
		if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) {
			return false
		}
	}

	if parser.buffer[parser.buffer_pos] == '#' {
		for !is_breakz(parser.buffer, parser.buffer_pos) {
			skip(parser)
			if parser.unread < 1 && !yaml_parser_update_buffer(parser, 1) {
				return false
			}
		}
	}

	// Check if we are at the end of the line.
	if !is_breakz(parser.buffer, parser.buffer_pos) {
		yaml_parser_set_scanner_error(parser, "while scanning a directive",
			start_mark, "did not find expected comment or line break")
		return false
	}

	// Eat a line break.
	if is_break(parser.buffer, parser.buffer_pos) {
		if parser.unread < 2 && !yaml_parser_update_buffer(parser, 2) {
			return false
		}
		skip_line(parser)
	}

	return true
}