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Edit File : Inline.php \| Size : 34.26 KB
<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. / namespace Symfony\Component\Yaml; use Symfony\Component\Yaml\Exception\DumpException; use Symfony\Component\Yaml\Exception\ParseException; use Symfony\Component\Yaml\Tag\TaggedValue; /* * Inline implements a YAML parser/dumper for the YAML inline syntax. * * @author Fabien Potencier <fabien@symfony.com> * * @internal / class Inline { public const REGEX_QUOTED_STRING = '(?:"([^"\\\\]+(?:\\\\.[^"\\\\]+)+)"\|\'([^\']+(?:\'\'[^\']+)+)\')'; public static int $parsedLineNumber = -1; public static ?string $parsedFilename = null; private static bool $exceptionOnInvalidType = false; private static bool $objectSupport = false; private static bool $objectForMap = false; private static bool $constantSupport = false; public static function initialize(int $flags, int $parsedLineNumber = null, string $parsedFilename = null): void { self::$exceptionOnInvalidType = (bool) (Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE & $flags); self::$objectSupport = (bool) (Yaml::PARSE_OBJECT & $flags); self::$objectForMap = (bool) (Yaml::PARSE_OBJECT_FOR_MAP & $flags); self::$constantSupport = (bool) (Yaml::PARSE_CONSTANT & $flags); self::$parsedFilename = $parsedFilename; if (null !== $parsedLineNumber) { self::$parsedLineNumber = $parsedLineNumber; } } /* * Converts a YAML string to a PHP value. * * @param int $flags A bit field of Yaml::PARSE_* constants to customize the YAML parser behavior * @param array $references Mapping of variable names to values * * @throws ParseException / public static function parse(string $value = null, int $flags = 0, array &$references = []): mixed { self::initialize($flags); $value = trim($value); if ('' === $value) { return ''; } $i = 0; $tag = self::parseTag($value, $i, $flags); switch ($value[$i]) { case '[': $result = self::parseSequence($value, $flags, $i, $references); ++$i; break; case '{': $result = self::parseMapping($value, $flags, $i, $references); ++$i; break; default: $result = self::parseScalar($value, $flags, null, $i, true, $references); } // some comments are allowed at the end if (preg_replace('/\s#.$/A', '', substr($value, $i))) { throw new ParseException(sprintf('Unexpected characters near "%s".', substr($value, $i)), self::$parsedLineNumber + 1, $value, self::$parsedFilename); } if (null !== $tag && '' !== $tag) { return new TaggedValue($tag, $result); } return $result; } /* * Dumps a given PHP variable to a YAML string. * * @param mixed $value The PHP variable to convert * @param int $flags A bit field of Yaml::DUMP_* constants to customize the dumped YAML string * * @throws DumpException When trying to dump PHP resource / public static function dump(mixed $value, int $flags = 0): string { switch (true) { case \is_resource($value): if (Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE & $flags) { throw new DumpException(sprintf('Unable to dump PHP resources in a YAML file ("%s").', get_resource_type($value))); } return self::dumpNull($flags); case $value instanceof \DateTimeInterface: return $value->format(match (true) { !$length = \strlen(rtrim($value->format('u'), '0')) => 'c', $length < 4 => 'Y-m-d\TH:i:s.vP', default => 'Y-m-d\TH:i:s.uP', }); case $value instanceof \UnitEnum: return sprintf('!php/const %s::%s', $value::class, $value->name); case \is_object($value): if ($value instanceof TaggedValue) { return '!'.$value->getTag().' '.self::dump($value->getValue(), $flags); } if (Yaml::DUMP_OBJECT & $flags) { return '!php/object '.self::dump(serialize($value)); } if (Yaml::DUMP_OBJECT_AS_MAP & $flags && ($value instanceof \stdClass \|\| $value instanceof \ArrayObject)) { return self::dumpHashArray($value, $flags); } if (Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE & $flags) { throw new DumpException('Object support when dumping a YAML file has been disabled.'); } return self::dumpNull($flags); case \is_array($value): return self::dumpArray($value, $flags); case null === $value: return self::dumpNull($flags); case true === $value: return 'true'; case false === $value: return 'false'; case \is_int($value): return $value; case is_numeric($value) && false === strpbrk($value, "\f\n\r\t\v"): $locale = setlocale(\LC_NUMERIC, 0); if (false !== $locale) { setlocale(\LC_NUMERIC, 'C'); } if (\is_float($value)) { $repr = (string) $value; if (is_infinite($value)) { $repr = str_ireplace('INF', '.Inf', $repr); } elseif (floor($value) == $value && $repr == $value) { // Preserve float data type since storing a whole number will result in integer value. if (!str_contains($repr, 'E')) { $repr = $repr.'.0'; } } } else { $repr = \is_string($value) ? "'$value'" : (string) $value; } if (false !== $locale) { setlocale(\LC_NUMERIC, $locale); } return $repr; case '' == $value: return "''"; case self::isBinaryString($value): return '!!binary '.base64_encode($value); case Escaper::requiresDoubleQuoting($value): return Escaper::escapeWithDoubleQuotes($value); case Escaper::requiresSingleQuoting($value): $singleQuoted = Escaper::escapeWithSingleQuotes($value); if (!str_contains($value, "'")) { return $singleQuoted; } // Attempt double-quoting the string instead to see if it's more efficient. $doubleQuoted = Escaper::escapeWithDoubleQuotes($value); return \strlen($doubleQuoted) < \strlen($singleQuoted) ? $doubleQuoted : $singleQuoted; case Parser::preg_match('{^[0-9]+[_0-9]$}', $value): case Parser::preg_match(self::getHexRegex(), $value): case Parser::preg_match(self::getTimestampRegex(), $value): return Escaper::escapeWithSingleQuotes($value); default: return $value; } } /** * Check if given array is hash or just normal indexed array. / public static function isHash(array\|\ArrayObject\|\stdClass $value): bool { if ($value instanceof \stdClass \|\| $value instanceof \ArrayObject) { return true; } $expectedKey = 0; foreach ($value as $key => $val) { if ($key !== $expectedKey++) { return true; } } return false; } /* * Dumps a PHP array to a YAML string. * * @param array $value The PHP array to dump * @param int $flags A bit field of Yaml::DUMP_* constants to customize the dumped YAML string / private static function dumpArray(array $value, int $flags): string { // array if (($value \|\| Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE & $flags) && !self::isHash($value)) { $output = []; foreach ($value as $val) { $output[] = self::dump($val, $flags); } return sprintf('[%s]', implode(', ', $output)); } return self::dumpHashArray($value, $flags); } /* * Dumps hash array to a YAML string. * * @param array\|\ArrayObject\|\stdClass $value The hash array to dump * @param int $flags A bit field of Yaml::DUMP_* constants to customize the dumped YAML string / private static function dumpHashArray(array\|\ArrayObject\|\stdClass $value, int $flags): string { $output = []; foreach ($value as $key => $val) { if (\is_int($key) && Yaml::DUMP_NUMERIC_KEY_AS_STRING & $flags) { $key = (string) $key; } $output[] = sprintf('%s: %s', self::dump($key, $flags), self::dump($val, $flags)); } return sprintf('{ %s }', implode(', ', $output)); } private static function dumpNull(int $flags): string { if (Yaml::DUMP_NULL_AS_TILDE & $flags) { return '~'; } return 'null'; } /* * Parses a YAML scalar. * * @throws ParseException When malformed inline YAML string is parsed / public static function parseScalar(string $scalar, int $flags = 0, array $delimiters = null, int &$i = 0, bool $evaluate = true, array &$references = [], bool &$isQuoted = null): mixed { if (\in_array($scalar[$i], ['"', "'"], true)) { // quoted scalar $isQuoted = true; $output = self::parseQuotedScalar($scalar, $i); if (null !== $delimiters) { $tmp = ltrim(substr($scalar, $i), " \n"); if ('' === $tmp) { throw new ParseException(sprintf('Unexpected end of line, expected one of "%s".', implode('', $delimiters)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } if (!\in_array($tmp[0], $delimiters)) { throw new ParseException(sprintf('Unexpected characters (%s).', substr($scalar, $i)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } } } else { // "normal" string $isQuoted = false; if (!$delimiters) { $output = substr($scalar, $i); $i += \strlen($output); // remove comments if (Parser::preg_match('/[ \t]+#/', $output, $match, \PREG_OFFSET_CAPTURE)) { $output = substr($output, 0, $match[0][1]); } } elseif (Parser::preg_match('/^(.?)('.implode('\|', $delimiters).')/', substr($scalar, $i), $match)) { $output = $match[1]; $i += \strlen($output); $output = trim($output); } else { throw new ParseException(sprintf('Malformed inline YAML string: "%s".', $scalar), self::$parsedLineNumber + 1, null, self::$parsedFilename); } // a non-quoted string cannot start with @ or ` (reserved) nor with a scalar indicator (\| or >) if ($output && ('@' === $output[0] \|\| '`' === $output[0] \|\| '\|' === $output[0] \|\| '>' === $output[0] \|\| '%' === $output[0])) { throw new ParseException(sprintf('The reserved indicator "%s" cannot start a plain scalar; you need to quote the scalar.', $output[0]), self::$parsedLineNumber + 1, $output, self::$parsedFilename); } if ($evaluate) { $output = self::evaluateScalar($output, $flags, $references, $isQuoted); } } return $output; } /** * Parses a YAML quoted scalar. * * @throws ParseException When malformed inline YAML string is parsed / private static function parseQuotedScalar(string $scalar, int &$i = 0): string { if (!Parser::preg_match('/'.self::REGEX_QUOTED_STRING.'/Au', substr($scalar, $i), $match)) { throw new ParseException(sprintf('Malformed inline YAML string: "%s".', substr($scalar, $i)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } $output = substr($match[0], 1, -1); $unescaper = new Unescaper(); if ('"' == $scalar[$i]) { $output = $unescaper->unescapeDoubleQuotedString($output); } else { $output = $unescaper->unescapeSingleQuotedString($output); } $i += \strlen($match[0]); return $output; } /* * Parses a YAML sequence. * * @throws ParseException When malformed inline YAML string is parsed / private static function parseSequence(string $sequence, int $flags, int &$i = 0, array &$references = []): array { $output = []; $len = \strlen($sequence); ++$i; // [foo, bar, ...] while ($i < $len) { if (']' === $sequence[$i]) { return $output; } if (',' === $sequence[$i] \|\| ' ' === $sequence[$i]) { ++$i; continue; } $tag = self::parseTag($sequence, $i, $flags); switch ($sequence[$i]) { case '[': // nested sequence $value = self::parseSequence($sequence, $flags, $i, $references); break; case '{': // nested mapping $value = self::parseMapping($sequence, $flags, $i, $references); break; default: $value = self::parseScalar($sequence, $flags, [',', ']'], $i, null === $tag, $references, $isQuoted); // the value can be an array if a reference has been resolved to an array var if (\is_string($value) && !$isQuoted && str_contains($value, ': ')) { // embedded mapping? try { $pos = 0; $value = self::parseMapping('{'.$value.'}', $flags, $pos, $references); } catch (\InvalidArgumentException) { // no, it's not } } if (!$isQuoted && \is_string($value) && '' !== $value && '&' === $value[0] && Parser::preg_match(Parser::REFERENCE_PATTERN, $value, $matches)) { $references[$matches['ref']] = $matches['value']; $value = $matches['value']; } --$i; } if (null !== $tag && '' !== $tag) { $value = new TaggedValue($tag, $value); } $output[] = $value; ++$i; } throw new ParseException(sprintf('Malformed inline YAML string: "%s".', $sequence), self::$parsedLineNumber + 1, null, self::$parsedFilename); } /* * Parses a YAML mapping. * * @throws ParseException When malformed inline YAML string is parsed / private static function parseMapping(string $mapping, int $flags, int &$i = 0, array &$references = []): array\|\stdClass { $output = []; $len = \strlen($mapping); ++$i; $allowOverwrite = false; // {foo: bar, bar:foo, ...} while ($i < $len) { switch ($mapping[$i]) { case ' ': case ',': case "\n": ++$i; continue 2; case '}': if (self::$objectForMap) { return (object) $output; } return $output; } // key $offsetBeforeKeyParsing = $i; $isKeyQuoted = \in_array($mapping[$i], ['"', "'"], true); $key = self::parseScalar($mapping, $flags, [':', ' '], $i, false); if ($offsetBeforeKeyParsing === $i) { throw new ParseException('Missing mapping key.', self::$parsedLineNumber + 1, $mapping); } if ('!php/const' === $key \|\| '!php/enum' === $key) { $key .= ' '.self::parseScalar($mapping, $flags, [':'], $i, false); $key = self::evaluateScalar($key, $flags); } if (false === $i = strpos($mapping, ':', $i)) { break; } if (!$isKeyQuoted) { $evaluatedKey = self::evaluateScalar($key, $flags, $references); if ('' !== $key && $evaluatedKey !== $key && !\is_string($evaluatedKey) && !\is_int($evaluatedKey)) { throw new ParseException('Implicit casting of incompatible mapping keys to strings is not supported. Quote your evaluable mapping keys instead.', self::$parsedLineNumber + 1, $mapping); } } if (!$isKeyQuoted && (!isset($mapping[$i + 1]) \|\| !\in_array($mapping[$i + 1], [' ', ',', '[', ']', '{', '}', "\n"], true))) { throw new ParseException('Colons must be followed by a space or an indication character (i.e. " ", ",", "[", "]", "{", "}").', self::$parsedLineNumber + 1, $mapping); } if ('<<' === $key) { $allowOverwrite = true; } while ($i < $len) { if (':' === $mapping[$i] \|\| ' ' === $mapping[$i] \|\| "\n" === $mapping[$i]) { ++$i; continue; } $tag = self::parseTag($mapping, $i, $flags); switch ($mapping[$i]) { case '[': // nested sequence $value = self::parseSequence($mapping, $flags, $i, $references); // Spec: Keys MUST be unique; first one wins. // Parser cannot abort this mapping earlier, since lines // are processed sequentially. // But overwriting is allowed when a merge node is used in current block. if ('<<' === $key) { foreach ($value as $parsedValue) { $output += $parsedValue; } } elseif ($allowOverwrite \|\| !isset($output[$key])) { if (null !== $tag) { $output[$key] = new TaggedValue($tag, $value); } else { $output[$key] = $value; } } elseif (isset($output[$key])) { throw new ParseException(sprintf('Duplicate key "%s" detected.', $key), self::$parsedLineNumber + 1, $mapping); } break; case '{': // nested mapping $value = self::parseMapping($mapping, $flags, $i, $references); // Spec: Keys MUST be unique; first one wins. // Parser cannot abort this mapping earlier, since lines // are processed sequentially. // But overwriting is allowed when a merge node is used in current block. if ('<<' === $key) { $output += $value; } elseif ($allowOverwrite \|\| !isset($output[$key])) { if (null !== $tag) { $output[$key] = new TaggedValue($tag, $value); } else { $output[$key] = $value; } } elseif (isset($output[$key])) { throw new ParseException(sprintf('Duplicate key "%s" detected.', $key), self::$parsedLineNumber + 1, $mapping); } break; default: $value = self::parseScalar($mapping, $flags, [',', '}', "\n"], $i, null === $tag, $references, $isValueQuoted); // Spec: Keys MUST be unique; first one wins. // Parser cannot abort this mapping earlier, since lines // are processed sequentially. // But overwriting is allowed when a merge node is used in current block. if ('<<' === $key) { $output += $value; } elseif ($allowOverwrite \|\| !isset($output[$key])) { if (!$isValueQuoted && \is_string($value) && '' !== $value && '&' === $value[0] && Parser::preg_match(Parser::REFERENCE_PATTERN, $value, $matches)) { $references[$matches['ref']] = $matches['value']; $value = $matches['value']; } if (null !== $tag) { $output[$key] = new TaggedValue($tag, $value); } else { $output[$key] = $value; } } elseif (isset($output[$key])) { throw new ParseException(sprintf('Duplicate key "%s" detected.', $key), self::$parsedLineNumber + 1, $mapping); } --$i; } ++$i; continue 2; } } throw new ParseException(sprintf('Malformed inline YAML string: "%s".', $mapping), self::$parsedLineNumber + 1, null, self::$parsedFilename); } /* * Evaluates scalars and replaces magic values. * * @throws ParseException when object parsing support was disabled and the parser detected a PHP object or when a reference could not be resolved / private static function evaluateScalar(string $scalar, int $flags, array &$references = [], bool &$isQuotedString = null): mixed { $isQuotedString = false; $scalar = trim($scalar); if (str_starts_with($scalar, '')) { if (false !== $pos = strpos($scalar, '#')) { $value = substr($scalar, 1, $pos - 2); } else { $value = substr($scalar, 1); } // an unquoted * if (false === $value \|\| '' === $value) { throw new ParseException('A reference must contain at least one character.', self::$parsedLineNumber + 1, $value, self::$parsedFilename); } if (!\array_key_exists($value, $references)) { throw new ParseException(sprintf('Reference "%s" does not exist.', $value), self::$parsedLineNumber + 1, $value, self::$parsedFilename); } return $references[$value]; } $scalarLower = strtolower($scalar); switch (true) { case 'null' === $scalarLower: case '' === $scalar: case '~' === $scalar: return null; case 'true' === $scalarLower: return true; case 'false' === $scalarLower: return false; case '!' === $scalar[0]: switch (true) { case str_starts_with($scalar, '!!str '): $s = (string) substr($scalar, 6); if (\in_array($s[0] ?? '', ['"', "'"], true)) { $isQuotedString = true; $s = self::parseQuotedScalar($s); } return $s; case str_starts_with($scalar, '! '): return substr($scalar, 2); case str_starts_with($scalar, '!php/object'): if (self::$objectSupport) { if (!isset($scalar[12])) { throw new ParseException('Missing value for tag "!php/object".', self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } return unserialize(self::parseScalar(substr($scalar, 12))); } if (self::$exceptionOnInvalidType) { throw new ParseException('Object support when parsing a YAML file has been disabled.', self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } return null; case str_starts_with($scalar, '!php/const'): if (self::$constantSupport) { if (!isset($scalar[11])) { throw new ParseException('Missing value for tag "!php/const".', self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } $i = 0; if (\defined($const = self::parseScalar(substr($scalar, 11), 0, null, $i, false))) { return \constant($const); } throw new ParseException(sprintf('The constant "%s" is not defined.', $const), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } if (self::$exceptionOnInvalidType) { throw new ParseException(sprintf('The string "%s" could not be parsed as a constant. Did you forget to pass the "Yaml::PARSE_CONSTANT" flag to the parser?', $scalar), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } return null; case str_starts_with($scalar, '!php/enum'): if (self::$constantSupport) { if (!isset($scalar[11])) { throw new ParseException('Missing value for tag "!php/enum".', self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } $i = 0; $enum = self::parseScalar(substr($scalar, 10), 0, null, $i, false); if ($useValue = str_ends_with($enum, '->value')) { $enum = substr($enum, 0, -7); } if (!\defined($enum)) { throw new ParseException(sprintf('The enum "%s" is not defined.', $enum), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } $value = \constant($enum); if (!$value instanceof \UnitEnum) { throw new ParseException(sprintf('The string "%s" is not the name of a valid enum.', $enum), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } if (!$useValue) { return $value; } if (!$value instanceof \BackedEnum) { throw new ParseException(sprintf('The enum "%s" defines no value next to its name.', $enum), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } return $value->value; } if (self::$exceptionOnInvalidType) { throw new ParseException(sprintf('The string "%s" could not be parsed as an enum. Did you forget to pass the "Yaml::PARSE_CONSTANT" flag to the parser?', $scalar), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } return null; case str_starts_with($scalar, '!!float '): return (float) substr($scalar, 8); case str_starts_with($scalar, '!!binary '): return self::evaluateBinaryScalar(substr($scalar, 9)); } throw new ParseException(sprintf('The string "%s" could not be parsed as it uses an unsupported built-in tag.', $scalar), self::$parsedLineNumber, $scalar, self::$parsedFilename); case preg_match('/^(?:\+\|-)?0o(?P<value>[0-7_]++)$/', $scalar, $matches): $value = str_replace('_', '', $matches['value']); if ('-' === $scalar[0]) { return -octdec($value); } return octdec($value); case \in_array($scalar[0], ['+', '-', '.'], true) \|\| is_numeric($scalar[0]): if (Parser::preg_match('{^[+-]?[0-9][0-9_]$}', $scalar)) { $scalar = str_replace('_', '', $scalar); } switch (true) { case ctype_digit($scalar): case '-' === $scalar[0] && ctype_digit(substr($scalar, 1)): $cast = (int) $scalar; return ($scalar === (string) $cast) ? $cast : $scalar; case is_numeric($scalar): case Parser::preg_match(self::getHexRegex(), $scalar): $scalar = str_replace('_', '', $scalar); return '0x' === $scalar[0].$scalar[1] ? hexdec($scalar) : (float) $scalar; case '.inf' === $scalarLower: case '.nan' === $scalarLower: return -log(0); case '-.inf' === $scalarLower: return log(0); case Parser::preg_match('/^(-\|\+)?[0-9][0-9_](\.[0-9_]+)?$/', $scalar): return (float) str_replace('_', '', $scalar); case Parser::preg_match(self::getTimestampRegex(), $scalar): // When no timezone is provided in the parsed date, YAML spec says we must assume UTC. $time = new \DateTimeImmutable($scalar, new \DateTimeZone('UTC')); if (Yaml::PARSE_DATETIME & $flags) { return $time; } if ('' !== rtrim($time->format('u'), '0')) { return (float) $time->format('U.u'); } try { if (false !== $scalar = $time->getTimestamp()) { return $scalar; } } catch (\ValueError) { // no-op } return $time->format('U'); } } return (string) $scalar; } private static function parseTag(string $value, int &$i, int $flags): ?string { if ('!' !== $value[$i]) { return null; } $tagLength = strcspn($value, " \t\n[]{},", $i + 1); $tag = substr($value, $i + 1, $tagLength); $nextOffset = $i + $tagLength + 1; $nextOffset += strspn($value, ' ', $nextOffset); if ('' === $tag && (!isset($value[$nextOffset]) \|\| \in_array($value[$nextOffset], [']', '}', ','], true))) { throw new ParseException('Using the unquoted scalar value "!" is not supported. You must quote it.', self::$parsedLineNumber + 1, $value, self::$parsedFilename); } // Is followed by a scalar and is a built-in tag if ('' !== $tag && (!isset($value[$nextOffset]) \|\| !\in_array($value[$nextOffset], ['[', '{'], true)) && ('!' === $tag[0] \|\| \in_array($tag, ['str', 'php/const', 'php/enum', 'php/object'], true))) { // Manage in {@link self::evaluateScalar()} return null; } $i = $nextOffset; // Built-in tags if ('' !== $tag && '!' === $tag[0]) { throw new ParseException(sprintf('The built-in tag "!%s" is not implemented.', $tag), self::$parsedLineNumber + 1, $value, self::$parsedFilename); } if ('' !== $tag && !isset($value[$i])) { throw new ParseException(sprintf('Missing value for tag "%s".', $tag), self::$parsedLineNumber + 1, $value, self::$parsedFilename); } if ('' === $tag \|\| Yaml::PARSE_CUSTOM_TAGS & $flags) { return $tag; } throw new ParseException(sprintf('Tags support is not enabled. Enable the "Yaml::PARSE_CUSTOM_TAGS" flag to use "!%s".', $tag), self::$parsedLineNumber + 1, $value, self::$parsedFilename); } public static function evaluateBinaryScalar(string $scalar): string { $parsedBinaryData = self::parseScalar(preg_replace('/\s/', '', $scalar)); if (0 !== (\strlen($parsedBinaryData) % 4)) { throw new ParseException(sprintf('The normalized base64 encoded data (data without whitespace characters) length must be a multiple of four (%d bytes given).', \strlen($parsedBinaryData)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } if (!Parser::preg_match('#^[A-Z0-9+/]+={0,2}$#i', $parsedBinaryData)) { throw new ParseException(sprintf('The base64 encoded data (%s) contains invalid characters.', $parsedBinaryData), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); } return base64_decode($parsedBinaryData, true); } private static function isBinaryString(string $value): bool { return !preg_match('//u', $value) \|\| preg_match('/[^\x00\x07-\x0d\x1B\x20-\xff]/', $value); } /** * Gets a regex that matches a YAML date. * * @see http://www.yaml.org/spec/1.2/spec.html#id2761573 / private static function getTimestampRegex(): string { return <<<EOF ~^ (?P<year>[0-9][0-9][0-9][0-9]) -(?P<month>[0-9][0-9]?) -(?P<day>[0-9][0-9]?) (?:(?:[Tt]\|[ \t]+) (?P<hour>[0-9][0-9]?) :(?P<minute>[0-9][0-9]) :(?P<second>[0-9][0-9]) (?:\.(?P<fraction>[0-9]))? (?:[ \t](?P<tz>Z\|(?P<tz_sign>[-+])(?P<tz_hour>[0-9][0-9]?) (?::(?P<tz_minute>[0-9][0-9]))?))?)? $~x EOF; } /* * Gets a regex that matches a YAML number in hexadecimal notation. */ private static function getHexRegex(): string { return '~^0x[0-9a-f_]++$~i'; } } Back

Edit File : Inline.php | Size : 34.26 KB

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Yaml;

use Symfony\Component\Yaml\Exception\DumpException;
use Symfony\Component\Yaml\Exception\ParseException;
use Symfony\Component\Yaml\Tag\TaggedValue;

/**
 * Inline implements a YAML parser/dumper for the YAML inline syntax.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @internal
 */
class Inline
{
    public const REGEX_QUOTED_STRING = '(?:"([^"\\\\]*+(?:\\\\.[^"\\\\]*+)*+)"|\'([^\']*+(?:\'\'[^\']*+)*+)\')';

public static int $parsedLineNumber = -1;
    public static ?string $parsedFilename = null;

private static bool $exceptionOnInvalidType = false;
    private static bool $objectSupport = false;
    private static bool $objectForMap = false;
    private static bool $constantSupport = false;

public static function initialize(int $flags, int $parsedLineNumber = null, string $parsedFilename = null): void
    {
        self::$exceptionOnInvalidType = (bool) (Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE & $flags);
        self::$objectSupport = (bool) (Yaml::PARSE_OBJECT & $flags);
        self::$objectForMap = (bool) (Yaml::PARSE_OBJECT_FOR_MAP & $flags);
        self::$constantSupport = (bool) (Yaml::PARSE_CONSTANT & $flags);
        self::$parsedFilename = $parsedFilename;

if (null !== $parsedLineNumber) {
            self::$parsedLineNumber = $parsedLineNumber;
        }
    }

/**
     * Converts a YAML string to a PHP value.
     *
     * @param int   $flags      A bit field of Yaml::PARSE_* constants to customize the YAML parser behavior
     * @param array $references Mapping of variable names to values
     *
     * @throws ParseException
     */
    public static function parse(string $value = null, int $flags = 0, array &$references = []): mixed
    {
        self::initialize($flags);

$value = trim($value);

if ('' === $value) {
            return '';
        }

$i = 0;
        $tag = self::parseTag($value, $i, $flags);
        switch ($value[$i]) {
            case '[':
                $result = self::parseSequence($value, $flags, $i, $references);
                ++$i;
                break;
            case '{':
                $result = self::parseMapping($value, $flags, $i, $references);
                ++$i;
                break;
            default:
                $result = self::parseScalar($value, $flags, null, $i, true, $references);
        }

// some comments are allowed at the end
        if (preg_replace('/\s*#.*$/A', '', substr($value, $i))) {
            throw new ParseException(sprintf('Unexpected characters near "%s".', substr($value, $i)), self::$parsedLineNumber + 1, $value, self::$parsedFilename);
        }

if (null !== $tag && '' !== $tag) {
            return new TaggedValue($tag, $result);
        }

return $result;
    }

/**
     * Dumps a given PHP variable to a YAML string.
     *
     * @param mixed $value The PHP variable to convert
     * @param int   $flags A bit field of Yaml::DUMP_* constants to customize the dumped YAML string
     *
     * @throws DumpException When trying to dump PHP resource
     */
    public static function dump(mixed $value, int $flags = 0): string
    {
        switch (true) {
            case \is_resource($value):
                if (Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE & $flags) {
                    throw new DumpException(sprintf('Unable to dump PHP resources in a YAML file ("%s").', get_resource_type($value)));
                }

return self::dumpNull($flags);
            case $value instanceof \DateTimeInterface:
                return $value->format(match (true) {
                    !$length = \strlen(rtrim($value->format('u'), '0')) => 'c',
                    $length < 4 => 'Y-m-d\TH:i:s.vP',
                    default => 'Y-m-d\TH:i:s.uP',
                });
            case $value instanceof \UnitEnum:
                return sprintf('!php/const %s::%s', $value::class, $value->name);
            case \is_object($value):
                if ($value instanceof TaggedValue) {
                    return '!'.$value->getTag().' '.self::dump($value->getValue(), $flags);
                }

if (Yaml::DUMP_OBJECT & $flags) {
                    return '!php/object '.self::dump(serialize($value));
                }

if (Yaml::DUMP_OBJECT_AS_MAP & $flags && ($value instanceof \stdClass || $value instanceof \ArrayObject)) {
                    return self::dumpHashArray($value, $flags);
                }

if (Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE & $flags) {
                    throw new DumpException('Object support when dumping a YAML file has been disabled.');
                }

return self::dumpNull($flags);
            case \is_array($value):
                return self::dumpArray($value, $flags);
            case null === $value:
                return self::dumpNull($flags);
            case true === $value:
                return 'true';
            case false === $value:
                return 'false';
            case \is_int($value):
                return $value;
            case is_numeric($value) && false === strpbrk($value, "\f\n\r\t\v"):
                $locale = setlocale(\LC_NUMERIC, 0);
                if (false !== $locale) {
                    setlocale(\LC_NUMERIC, 'C');
                }
                if (\is_float($value)) {
                    $repr = (string) $value;
                    if (is_infinite($value)) {
                        $repr = str_ireplace('INF', '.Inf', $repr);
                    } elseif (floor($value) == $value && $repr == $value) {
                        // Preserve float data type since storing a whole number will result in integer value.
                        if (!str_contains($repr, 'E')) {
                            $repr = $repr.'.0';
                        }
                    }
                } else {
                    $repr = \is_string($value) ? "'$value'" : (string) $value;
                }
                if (false !== $locale) {
                    setlocale(\LC_NUMERIC, $locale);
                }

return $repr;
            case '' == $value:
                return "''";
            case self::isBinaryString($value):
                return '!!binary '.base64_encode($value);
            case Escaper::requiresDoubleQuoting($value):
                return Escaper::escapeWithDoubleQuotes($value);
            case Escaper::requiresSingleQuoting($value):
                $singleQuoted = Escaper::escapeWithSingleQuotes($value);
                if (!str_contains($value, "'")) {
                    return $singleQuoted;
                }
                // Attempt double-quoting the string instead to see if it's more efficient.
                $doubleQuoted = Escaper::escapeWithDoubleQuotes($value);

return \strlen($doubleQuoted) < \strlen($singleQuoted) ? $doubleQuoted : $singleQuoted;
            case Parser::preg_match('{^[0-9]+[_0-9]*$}', $value):
            case Parser::preg_match(self::getHexRegex(), $value):
            case Parser::preg_match(self::getTimestampRegex(), $value):
                return Escaper::escapeWithSingleQuotes($value);
            default:
                return $value;
        }
    }

/**
     * Check if given array is hash or just normal indexed array.
     */
    public static function isHash(array|\ArrayObject|\stdClass $value): bool
    {
        if ($value instanceof \stdClass || $value instanceof \ArrayObject) {
            return true;
        }

$expectedKey = 0;

foreach ($value as $key => $val) {
            if ($key !== $expectedKey++) {
                return true;
            }
        }

return false;
    }

/**
     * Dumps a PHP array to a YAML string.
     *
     * @param array $value The PHP array to dump
     * @param int   $flags A bit field of Yaml::DUMP_* constants to customize the dumped YAML string
     */
    private static function dumpArray(array $value, int $flags): string
    {
        // array
        if (($value || Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE & $flags) && !self::isHash($value)) {
            $output = [];
            foreach ($value as $val) {
                $output[] = self::dump($val, $flags);
            }

return sprintf('[%s]', implode(', ', $output));
        }

return self::dumpHashArray($value, $flags);
    }

/**
     * Dumps hash array to a YAML string.
     *
     * @param array|\ArrayObject|\stdClass $value The hash array to dump
     * @param int                          $flags A bit field of Yaml::DUMP_* constants to customize the dumped YAML string
     */
    private static function dumpHashArray(array|\ArrayObject|\stdClass $value, int $flags): string
    {
        $output = [];
        foreach ($value as $key => $val) {
            if (\is_int($key) && Yaml::DUMP_NUMERIC_KEY_AS_STRING & $flags) {
                $key = (string) $key;
            }

$output[] = sprintf('%s: %s', self::dump($key, $flags), self::dump($val, $flags));
        }

return sprintf('{ %s }', implode(', ', $output));
    }

private static function dumpNull(int $flags): string
    {
        if (Yaml::DUMP_NULL_AS_TILDE & $flags) {
            return '~';
        }

return 'null';
    }

/**
     * Parses a YAML scalar.
     *
     * @throws ParseException When malformed inline YAML string is parsed
     */
    public static function parseScalar(string $scalar, int $flags = 0, array $delimiters = null, int &$i = 0, bool $evaluate = true, array &$references = [], bool &$isQuoted = null): mixed
    {
        if (\in_array($scalar[$i], ['"', "'"], true)) {
            // quoted scalar
            $isQuoted = true;
            $output = self::parseQuotedScalar($scalar, $i);

if (null !== $delimiters) {
                $tmp = ltrim(substr($scalar, $i), " \n");
                if ('' === $tmp) {
                    throw new ParseException(sprintf('Unexpected end of line, expected one of "%s".', implode('', $delimiters)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                }
                if (!\in_array($tmp[0], $delimiters)) {
                    throw new ParseException(sprintf('Unexpected characters (%s).', substr($scalar, $i)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                }
            }
        } else {
            // "normal" string
            $isQuoted = false;

if (!$delimiters) {
                $output = substr($scalar, $i);
                $i += \strlen($output);

// remove comments
                if (Parser::preg_match('/[ \t]+#/', $output, $match, \PREG_OFFSET_CAPTURE)) {
                    $output = substr($output, 0, $match[0][1]);
                }
            } elseif (Parser::preg_match('/^(.*?)('.implode('|', $delimiters).')/', substr($scalar, $i), $match)) {
                $output = $match[1];
                $i += \strlen($output);
                $output = trim($output);
            } else {
                throw new ParseException(sprintf('Malformed inline YAML string: "%s".', $scalar), self::$parsedLineNumber + 1, null, self::$parsedFilename);
            }

// a non-quoted string cannot start with @ or ` (reserved) nor with a scalar indicator (| or >)
            if ($output && ('@' === $output[0] || '`' === $output[0] || '|' === $output[0] || '>' === $output[0] || '%' === $output[0])) {
                throw new ParseException(sprintf('The reserved indicator "%s" cannot start a plain scalar; you need to quote the scalar.', $output[0]), self::$parsedLineNumber + 1, $output, self::$parsedFilename);
            }

if ($evaluate) {
                $output = self::evaluateScalar($output, $flags, $references, $isQuoted);
            }
        }

return $output;
    }

/**
     * Parses a YAML quoted scalar.
     *
     * @throws ParseException When malformed inline YAML string is parsed
     */
    private static function parseQuotedScalar(string $scalar, int &$i = 0): string
    {
        if (!Parser::preg_match('/'.self::REGEX_QUOTED_STRING.'/Au', substr($scalar, $i), $match)) {
            throw new ParseException(sprintf('Malformed inline YAML string: "%s".', substr($scalar, $i)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
        }

$output = substr($match[0], 1, -1);

$unescaper = new Unescaper();
        if ('"' == $scalar[$i]) {
            $output = $unescaper->unescapeDoubleQuotedString($output);
        } else {
            $output = $unescaper->unescapeSingleQuotedString($output);
        }

$i += \strlen($match[0]);

return $output;
    }

/**
     * Parses a YAML sequence.
     *
     * @throws ParseException When malformed inline YAML string is parsed
     */
    private static function parseSequence(string $sequence, int $flags, int &$i = 0, array &$references = []): array
    {
        $output = [];
        $len = \strlen($sequence);
        ++$i;

// [foo, bar, ...]
        while ($i < $len) {
            if (']' === $sequence[$i]) {
                return $output;
            }
            if (',' === $sequence[$i] || ' ' === $sequence[$i]) {
                ++$i;

continue;
            }

$tag = self::parseTag($sequence, $i, $flags);
            switch ($sequence[$i]) {
                case '[':
                    // nested sequence
                    $value = self::parseSequence($sequence, $flags, $i, $references);
                    break;
                case '{':
                    // nested mapping
                    $value = self::parseMapping($sequence, $flags, $i, $references);
                    break;
                default:
                    $value = self::parseScalar($sequence, $flags, [',', ']'], $i, null === $tag, $references, $isQuoted);

// the value can be an array if a reference has been resolved to an array var
                    if (\is_string($value) && !$isQuoted && str_contains($value, ': ')) {
                        // embedded mapping?
                        try {
                            $pos = 0;
                            $value = self::parseMapping('{'.$value.'}', $flags, $pos, $references);
                        } catch (\InvalidArgumentException) {
                            // no, it's not
                        }
                    }

if (!$isQuoted && \is_string($value) && '' !== $value && '&' === $value[0] && Parser::preg_match(Parser::REFERENCE_PATTERN, $value, $matches)) {
                        $references[$matches['ref']] = $matches['value'];
                        $value = $matches['value'];
                    }

--$i;
            }

if (null !== $tag && '' !== $tag) {
                $value = new TaggedValue($tag, $value);
            }

$output[] = $value;

++$i;
        }

throw new ParseException(sprintf('Malformed inline YAML string: "%s".', $sequence), self::$parsedLineNumber + 1, null, self::$parsedFilename);
    }

/**
     * Parses a YAML mapping.
     *
     * @throws ParseException When malformed inline YAML string is parsed
     */
    private static function parseMapping(string $mapping, int $flags, int &$i = 0, array &$references = []): array|\stdClass
    {
        $output = [];
        $len = \strlen($mapping);
        ++$i;
        $allowOverwrite = false;

// {foo: bar, bar:foo, ...}
        while ($i < $len) {
            switch ($mapping[$i]) {
                case ' ':
                case ',':
                case "\n":
                    ++$i;
                    continue 2;
                case '}':
                    if (self::$objectForMap) {
                        return (object) $output;
                    }

return $output;
            }

// key
            $offsetBeforeKeyParsing = $i;
            $isKeyQuoted = \in_array($mapping[$i], ['"', "'"], true);
            $key = self::parseScalar($mapping, $flags, [':', ' '], $i, false);

if ($offsetBeforeKeyParsing === $i) {
                throw new ParseException('Missing mapping key.', self::$parsedLineNumber + 1, $mapping);
            }

if ('!php/const' === $key || '!php/enum' === $key) {
                $key .= ' '.self::parseScalar($mapping, $flags, [':'], $i, false);
                $key = self::evaluateScalar($key, $flags);
            }

if (false === $i = strpos($mapping, ':', $i)) {
                break;
            }

if (!$isKeyQuoted) {
                $evaluatedKey = self::evaluateScalar($key, $flags, $references);

if ('' !== $key && $evaluatedKey !== $key && !\is_string($evaluatedKey) && !\is_int($evaluatedKey)) {
                    throw new ParseException('Implicit casting of incompatible mapping keys to strings is not supported. Quote your evaluable mapping keys instead.', self::$parsedLineNumber + 1, $mapping);
                }
            }

if (!$isKeyQuoted && (!isset($mapping[$i + 1]) || !\in_array($mapping[$i + 1], [' ', ',', '[', ']', '{', '}', "\n"], true))) {
                throw new ParseException('Colons must be followed by a space or an indication character (i.e. " ", ",", "[", "]", "{", "}").', self::$parsedLineNumber + 1, $mapping);
            }

if ('<<' === $key) {
                $allowOverwrite = true;
            }

while ($i < $len) {
                if (':' === $mapping[$i] || ' ' === $mapping[$i] || "\n" === $mapping[$i]) {
                    ++$i;

continue;
                }

$tag = self::parseTag($mapping, $i, $flags);
                switch ($mapping[$i]) {
                    case '[':
                        // nested sequence
                        $value = self::parseSequence($mapping, $flags, $i, $references);
                        // Spec: Keys MUST be unique; first one wins.
                        // Parser cannot abort this mapping earlier, since lines
                        // are processed sequentially.
                        // But overwriting is allowed when a merge node is used in current block.
                        if ('<<' === $key) {
                            foreach ($value as $parsedValue) {
                                $output += $parsedValue;
                            }
                        } elseif ($allowOverwrite || !isset($output[$key])) {
                            if (null !== $tag) {
                                $output[$key] = new TaggedValue($tag, $value);
                            } else {
                                $output[$key] = $value;
                            }
                        } elseif (isset($output[$key])) {
                            throw new ParseException(sprintf('Duplicate key "%s" detected.', $key), self::$parsedLineNumber + 1, $mapping);
                        }
                        break;
                    case '{':
                        // nested mapping
                        $value = self::parseMapping($mapping, $flags, $i, $references);
                        // Spec: Keys MUST be unique; first one wins.
                        // Parser cannot abort this mapping earlier, since lines
                        // are processed sequentially.
                        // But overwriting is allowed when a merge node is used in current block.
                        if ('<<' === $key) {
                            $output += $value;
                        } elseif ($allowOverwrite || !isset($output[$key])) {
                            if (null !== $tag) {
                                $output[$key] = new TaggedValue($tag, $value);
                            } else {
                                $output[$key] = $value;
                            }
                        } elseif (isset($output[$key])) {
                            throw new ParseException(sprintf('Duplicate key "%s" detected.', $key), self::$parsedLineNumber + 1, $mapping);
                        }
                        break;
                    default:
                        $value = self::parseScalar($mapping, $flags, [',', '}', "\n"], $i, null === $tag, $references, $isValueQuoted);
                        // Spec: Keys MUST be unique; first one wins.
                        // Parser cannot abort this mapping earlier, since lines
                        // are processed sequentially.
                        // But overwriting is allowed when a merge node is used in current block.
                        if ('<<' === $key) {
                            $output += $value;
                        } elseif ($allowOverwrite || !isset($output[$key])) {
                            if (!$isValueQuoted && \is_string($value) && '' !== $value && '&' === $value[0] && Parser::preg_match(Parser::REFERENCE_PATTERN, $value, $matches)) {
                                $references[$matches['ref']] = $matches['value'];
                                $value = $matches['value'];
                            }

if (null !== $tag) {
                                $output[$key] = new TaggedValue($tag, $value);
                            } else {
                                $output[$key] = $value;
                            }
                        } elseif (isset($output[$key])) {
                            throw new ParseException(sprintf('Duplicate key "%s" detected.', $key), self::$parsedLineNumber + 1, $mapping);
                        }
                        --$i;
                }
                ++$i;

continue 2;
            }
        }

throw new ParseException(sprintf('Malformed inline YAML string: "%s".', $mapping), self::$parsedLineNumber + 1, null, self::$parsedFilename);
    }

/**
     * Evaluates scalars and replaces magic values.
     *
     * @throws ParseException when object parsing support was disabled and the parser detected a PHP object or when a reference could not be resolved
     */
    private static function evaluateScalar(string $scalar, int $flags, array &$references = [], bool &$isQuotedString = null): mixed
    {
        $isQuotedString = false;
        $scalar = trim($scalar);

if (str_starts_with($scalar, '*')) {
            if (false !== $pos = strpos($scalar, '#')) {
                $value = substr($scalar, 1, $pos - 2);
            } else {
                $value = substr($scalar, 1);
            }

// an unquoted *
            if (false === $value || '' === $value) {
                throw new ParseException('A reference must contain at least one character.', self::$parsedLineNumber + 1, $value, self::$parsedFilename);
            }

if (!\array_key_exists($value, $references)) {
                throw new ParseException(sprintf('Reference "%s" does not exist.', $value), self::$parsedLineNumber + 1, $value, self::$parsedFilename);
            }

return $references[$value];
        }

$scalarLower = strtolower($scalar);

switch (true) {
            case 'null' === $scalarLower:
            case '' === $scalar:
            case '~' === $scalar:
                return null;
            case 'true' === $scalarLower:
                return true;
            case 'false' === $scalarLower:
                return false;
            case '!' === $scalar[0]:
                switch (true) {
                    case str_starts_with($scalar, '!!str '):
                        $s = (string) substr($scalar, 6);

if (\in_array($s[0] ?? '', ['"', "'"], true)) {
                            $isQuotedString = true;
                            $s = self::parseQuotedScalar($s);
                        }

return $s;
                    case str_starts_with($scalar, '! '):
                        return substr($scalar, 2);
                    case str_starts_with($scalar, '!php/object'):
                        if (self::$objectSupport) {
                            if (!isset($scalar[12])) {
                                throw new ParseException('Missing value for tag "!php/object".', self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                            }

return unserialize(self::parseScalar(substr($scalar, 12)));
                        }

if (self::$exceptionOnInvalidType) {
                            throw new ParseException('Object support when parsing a YAML file has been disabled.', self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                        }

return null;
                    case str_starts_with($scalar, '!php/const'):
                        if (self::$constantSupport) {
                            if (!isset($scalar[11])) {
                                throw new ParseException('Missing value for tag "!php/const".', self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                            }

$i = 0;
                            if (\defined($const = self::parseScalar(substr($scalar, 11), 0, null, $i, false))) {
                                return \constant($const);
                            }

throw new ParseException(sprintf('The constant "%s" is not defined.', $const), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                        }
                        if (self::$exceptionOnInvalidType) {
                            throw new ParseException(sprintf('The string "%s" could not be parsed as a constant. Did you forget to pass the "Yaml::PARSE_CONSTANT" flag to the parser?', $scalar), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                        }

return null;
                    case str_starts_with($scalar, '!php/enum'):
                        if (self::$constantSupport) {
                            if (!isset($scalar[11])) {
                                throw new ParseException('Missing value for tag "!php/enum".', self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                            }

$i = 0;
                            $enum = self::parseScalar(substr($scalar, 10), 0, null, $i, false);
                            if ($useValue = str_ends_with($enum, '->value')) {
                                $enum = substr($enum, 0, -7);
                            }
                            if (!\defined($enum)) {
                                throw new ParseException(sprintf('The enum "%s" is not defined.', $enum), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                            }

$value = \constant($enum);

if (!$value instanceof \UnitEnum) {
                                throw new ParseException(sprintf('The string "%s" is not the name of a valid enum.', $enum), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                            }
                            if (!$useValue) {
                                return $value;
                            }
                            if (!$value instanceof \BackedEnum) {
                                throw new ParseException(sprintf('The enum "%s" defines no value next to its name.', $enum), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                            }

return $value->value;
                        }
                        if (self::$exceptionOnInvalidType) {
                            throw new ParseException(sprintf('The string "%s" could not be parsed as an enum. Did you forget to pass the "Yaml::PARSE_CONSTANT" flag to the parser?', $scalar), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                        }

return null;
                    case str_starts_with($scalar, '!!float '):
                        return (float) substr($scalar, 8);
                    case str_starts_with($scalar, '!!binary '):
                        return self::evaluateBinaryScalar(substr($scalar, 9));
                }

throw new ParseException(sprintf('The string "%s" could not be parsed as it uses an unsupported built-in tag.', $scalar), self::$parsedLineNumber, $scalar, self::$parsedFilename);
            case preg_match('/^(?:\+|-)?0o(?P<value>[0-7_]++)$/', $scalar, $matches):
                $value = str_replace('_', '', $matches['value']);

if ('-' === $scalar[0]) {
                    return -octdec($value);
                }

return octdec($value);
            case \in_array($scalar[0], ['+', '-', '.'], true) || is_numeric($scalar[0]):
                if (Parser::preg_match('{^[+-]?[0-9][0-9_]*$}', $scalar)) {
                    $scalar = str_replace('_', '', $scalar);
                }

switch (true) {
                    case ctype_digit($scalar):
                    case '-' === $scalar[0] && ctype_digit(substr($scalar, 1)):
                        $cast = (int) $scalar;

return ($scalar === (string) $cast) ? $cast : $scalar;
                    case is_numeric($scalar):
                    case Parser::preg_match(self::getHexRegex(), $scalar):
                        $scalar = str_replace('_', '', $scalar);

return '0x' === $scalar[0].$scalar[1] ? hexdec($scalar) : (float) $scalar;
                    case '.inf' === $scalarLower:
                    case '.nan' === $scalarLower:
                        return -log(0);
                    case '-.inf' === $scalarLower:
                        return log(0);
                    case Parser::preg_match('/^(-|\+)?[0-9][0-9_]*(\.[0-9_]+)?$/', $scalar):
                        return (float) str_replace('_', '', $scalar);
                    case Parser::preg_match(self::getTimestampRegex(), $scalar):
                        // When no timezone is provided in the parsed date, YAML spec says we must assume UTC.
                        $time = new \DateTimeImmutable($scalar, new \DateTimeZone('UTC'));

if (Yaml::PARSE_DATETIME & $flags) {
                            return $time;
                        }

if ('' !== rtrim($time->format('u'), '0')) {
                            return (float) $time->format('U.u');
                        }

try {
                            if (false !== $scalar = $time->getTimestamp()) {
                                return $scalar;
                            }
                        } catch (\ValueError) {
                            // no-op
                        }

return $time->format('U');
                }
        }

return (string) $scalar;
    }

private static function parseTag(string $value, int &$i, int $flags): ?string
    {
        if ('!' !== $value[$i]) {
            return null;
        }

$tagLength = strcspn($value, " \t\n[]{},", $i + 1);
        $tag = substr($value, $i + 1, $tagLength);

$nextOffset = $i + $tagLength + 1;
        $nextOffset += strspn($value, ' ', $nextOffset);

if ('' === $tag && (!isset($value[$nextOffset]) || \in_array($value[$nextOffset], [']', '}', ','], true))) {
            throw new ParseException('Using the unquoted scalar value "!" is not supported. You must quote it.', self::$parsedLineNumber + 1, $value, self::$parsedFilename);
        }

// Is followed by a scalar and is a built-in tag
        if ('' !== $tag && (!isset($value[$nextOffset]) || !\in_array($value[$nextOffset], ['[', '{'], true)) && ('!' === $tag[0] || \in_array($tag, ['str', 'php/const', 'php/enum', 'php/object'], true))) {
            // Manage in {@link self::evaluateScalar()}
            return null;
        }

$i = $nextOffset;

// Built-in tags
        if ('' !== $tag && '!' === $tag[0]) {
            throw new ParseException(sprintf('The built-in tag "!%s" is not implemented.', $tag), self::$parsedLineNumber + 1, $value, self::$parsedFilename);
        }

if ('' !== $tag && !isset($value[$i])) {
            throw new ParseException(sprintf('Missing value for tag "%s".', $tag), self::$parsedLineNumber + 1, $value, self::$parsedFilename);
        }

if ('' === $tag || Yaml::PARSE_CUSTOM_TAGS & $flags) {
            return $tag;
        }

throw new ParseException(sprintf('Tags support is not enabled. Enable the "Yaml::PARSE_CUSTOM_TAGS" flag to use "!%s".', $tag), self::$parsedLineNumber + 1, $value, self::$parsedFilename);
    }

public static function evaluateBinaryScalar(string $scalar): string
    {
        $parsedBinaryData = self::parseScalar(preg_replace('/\s/', '', $scalar));

if (0 !== (\strlen($parsedBinaryData) % 4)) {
            throw new ParseException(sprintf('The normalized base64 encoded data (data without whitespace characters) length must be a multiple of four (%d bytes given).', \strlen($parsedBinaryData)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
        }

if (!Parser::preg_match('#^[A-Z0-9+/]+={0,2}$#i', $parsedBinaryData)) {
            throw new ParseException(sprintf('The base64 encoded data (%s) contains invalid characters.', $parsedBinaryData), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
        }

return base64_decode($parsedBinaryData, true);
    }

private static function isBinaryString(string $value): bool
    {
        return !preg_match('//u', $value) || preg_match('/[^\x00\x07-\x0d\x1B\x20-\xff]/', $value);
    }

/**
     * Gets a regex that matches a YAML date.
     *
     * @see http://www.yaml.org/spec/1.2/spec.html#id2761573
     */
    private static function getTimestampRegex(): string
    {
        return <<<EOF
        ~^
        (?P<year>[0-9][0-9][0-9][0-9])
        -(?P<month>[0-9][0-9]?)
        -(?P<day>[0-9][0-9]?)
        (?:(?:[Tt]|[ \t]+)
        (?P<hour>[0-9][0-9]?)
        :(?P<minute>[0-9][0-9])
        :(?P<second>[0-9][0-9])
        (?:\.(?P<fraction>[0-9]*))?
        (?:[ \t]*(?P<tz>Z|(?P<tz_sign>[-+])(?P<tz_hour>[0-9][0-9]?)
        (?::(?P<tz_minute>[0-9][0-9]))?))?)?
        $~x
EOF;
    }

/**
     * Gets a regex that matches a YAML number in hexadecimal notation.
     */
    private static function getHexRegex(): string
    {
        return '~^0x[0-9a-f_]++$~i';
    }
}

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