77             $i = 0;
78             $tag = self::parseTag($value, $i, $flags);
79             switch ($value[$i]) {
81                     $result = self::parseSequence($value, $flags, $i, $references);
82                     ++$i;
85                     $result = self::parseMapping($value, $flags, $i, $references);
86                     ++$i;
89                     $result = self::parseScalar($value, $flags, null, $i, true, $references);
93             if (preg_replace('/\s*#.*$/A', '', substr($value, $i))) {
94 … ParseException(sprintf('Unexpected characters near "%s".', substr($value, $i)), self::$parsedLine…
268 …parseScalar(string $scalar, int $flags = 0, array $delimiters = null, int &$i = 0, bool $evaluate …  argument
270         if (\in_array($scalar[$i], ['"', "'"], true)) {
273             $output = self::parseQuotedScalar($scalar, $i);
276                 $tmp = ltrim(substr($scalar, $i), " \n");
281 … new ParseException(sprintf('Unexpected characters (%s).', substr($scalar, $i)), self::$parsedLine…
289                 $output = substr($scalar, $i);
290                 $i += \strlen($output);
296 …seif (Parser::preg_match('/^(.*?)('.implode('|', $delimiters).')/', substr($scalar, $i), $match)) {
298                 $i += \strlen($output);
322     private static function parseQuotedScalar(string $scalar, int &$i = 0): string  argument
324         if (!Parser::preg_match('/'.self::REGEX_QUOTED_STRING.'/Au', substr($scalar, $i), $match)) {
325 …seException(sprintf('Malformed inline YAML string: "%s".', substr($scalar, $i)), self::$parsedLine…
331         if ('"' == $scalar[$i]) {
337         $i += \strlen($match[0]);
347 …private static function parseSequence(string $sequence, int $flags, int &$i = 0, array &$reference…  argument
351         ++$i;
354         while ($i < $len) {
355             if (']' === $sequence[$i]) {
358             if (',' === $sequence[$i] || ' ' === $sequence[$i]) {
359                 ++$i;
364             $tag = self::parseTag($sequence, $i, $flags);
365             switch ($sequence[$i]) {
368                     $value = self::parseSequence($sequence, $flags, $i, $references);
372                     $value = self::parseMapping($sequence, $flags, $i, $references);
375 …$value = self::parseScalar($sequence, $flags, [',', ']'], $i, null === $tag, $references, $isQuote…
393                     --$i;
402             ++$i;
415 …private static function parseMapping(string $mapping, int $flags, int &$i = 0, array &$references …  argument
419         ++$i;
423         while ($i < $len) {
424             switch ($mapping[$i]) {
428                     ++$i;
439             $offsetBeforeKeyParsing = $i;
440             $isKeyQuoted = \in_array($mapping[$i], ['"', "'"], true);
441             $key = self::parseScalar($mapping, $flags, [':', ' '], $i, false);
443             if ($offsetBeforeKeyParsing === $i) {
448                 $key .= ' '.self::parseScalar($mapping, $flags, [':'], $i, false);
452             if (false === $i = strpos($mapping, ':', $i)) {
464 …if (!$isKeyQuoted && (!isset($mapping[$i + 1]) || !\in_array($mapping[$i + 1], [' ', ',', '[', ']'…
472             while ($i < $len) {
473                 if (':' === $mapping[$i] || ' ' === $mapping[$i] || "\n" === $mapping[$i]) {
474                     ++$i;
479                 $tag = self::parseTag($mapping, $i, $flags);
480                 switch ($mapping[$i]) {
483                         $value = self::parseSequence($mapping, $flags, $i, $references);
504                         $value = self::parseMapping($mapping, $flags, $i, $references);
522 …$value = self::parseScalar($mapping, $flags, [',', '}', "\n"], $i, null === $tag, $references, $is…
543                         --$i;
545                 ++$i;
633                             $i = 0;
634 …               if (\defined($const = self::parseScalar(substr($scalar, 11), 0, null, $i, false))) {
721     private static function parseTag(string $value, int &$i, int $flags): ?string  argument
723         if ('!' !== $value[$i]) {
727         $tagLength = strcspn($value, " \t\n[]{},", $i + 1);
728         $tag = substr($value, $i + 1, $tagLength);
730         $nextOffset = $i + $tagLength + 1;
743         $i = $nextOffset;
750         if ('' !== $tag && !isset($value[$i])) {