Function yaml_parser_scan_uri_escapes

scannerc.go:2144–2187

Decode an URI-escape sequence corresponding to a single UTF-8 character.

(parser *yaml_parser_t, directive bool, start_mark yaml_mark_t, s *[]byte)

// Decode an URI-escape sequence corresponding to a single UTF-8 character.
func yaml_parser_scan_uri_escapes(parser *yaml_parser_t, directive bool, start_mark yaml_mark_t, s *[]byte) bool {

	// Decode the required number of characters.
	w := 1024
	for w > 0 {
		// Check for a URI-escaped octet.
		if parser.unread < 3 && !yaml_parser_update_buffer(parser, 3) {
			return false
		}

		if !(parser.buffer[parser.buffer_pos] == '%' &&
			is_hex(parser.buffer, parser.buffer_pos+1) &&
			is_hex(parser.buffer, parser.buffer_pos+2)) {
			return yaml_parser_set_scanner_tag_error(parser, directive,
				start_mark, "did not find URI escaped octet")
		}

		// Get the octet.
		octet := byte((as_hex(parser.buffer, parser.buffer_pos+1) << 4) + as_hex(parser.buffer, parser.buffer_pos+2))

		// If it is the leading octet, determine the length of the UTF-8 sequence.
		if w == 1024 {
			w = width(octet)
			if w == 0 {
				return yaml_parser_set_scanner_tag_error(parser, directive,
					start_mark, "found an incorrect leading UTF-8 octet")
			}
		} else {
			// Check if the trailing octet is correct.
			if octet&0xC0 != 0x80 {
				return yaml_parser_set_scanner_tag_error(parser, directive,
					start_mark, "found an incorrect trailing UTF-8 octet")
			}
		}

		// Copy the octet and move the pointers.
		*s = append(*s, octet)
		skip(parser)
		skip(parser)
		skip(parser)
		w--
	}
	return true
}

// Scan a block scalar.
func yaml_parser_scan_block_scalar(parser *yaml_parser_t, token *yaml_token_t, literal bool) bool {