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Diffstat (limited to 'vendor/symfony/yaml/Inline.php')
| -rw-r--r-- | vendor/symfony/yaml/Inline.php | 744 |
1 files changed, 744 insertions, 0 deletions
diff --git a/vendor/symfony/yaml/Inline.php b/vendor/symfony/yaml/Inline.php new file mode 100644 index 0000000..261d618 --- /dev/null +++ b/vendor/symfony/yaml/Inline.php @@ -0,0 +1,744 @@ +<?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 +{ + const REGEX_QUOTED_STRING = '(?:"([^"\\\\]*+(?:\\\\.[^"\\\\]*+)*+)"|\'([^\']*+(?:\'\'[^\']*+)*+)\')'; + + public static $parsedLineNumber = -1; + public static $parsedFilename; + + private static $exceptionOnInvalidType = false; + private static $objectSupport = false; + private static $objectForMap = false; + private static $constantSupport = false; + + /** + * @param int $flags + * @param int|null $parsedLineNumber + * @param string|null $parsedFilename + */ + public static function initialize($flags, $parsedLineNumber = null, $parsedFilename = null) + { + self::$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 string $value A YAML string + * @param int $flags A bit field of PARSE_* constants to customize the YAML parser behavior + * @param array $references Mapping of variable names to values + * + * @return mixed A PHP value + * + * @throws ParseException + */ + public static function parse(string $value = null, int $flags = 0, array $references = array()) + { + self::initialize($flags); + + $value = trim($value); + + if ('' === $value) { + return ''; + } + + if (2 /* MB_OVERLOAD_STRING */ & (int) ini_get('mbstring.func_overload')) { + $mbEncoding = mb_internal_encoding(); + mb_internal_encoding('ASCII'); + } + + $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, null === $tag, $references); + } + + if (null !== $tag && '' !== $tag) { + return new TaggedValue($tag, $result); + } + + // some comments are allowed at the end + if (preg_replace('/\s+#.*$/A', '', substr($value, $i))) { + throw new ParseException(sprintf('Unexpected characters near "%s".', substr($value, $i)), self::$parsedLineNumber + 1, $value, self::$parsedFilename); + } + + if (isset($mbEncoding)) { + mb_internal_encoding($mbEncoding); + } + + return $result; + } + + /** + * Dumps a given PHP variable to a YAML string. + * + * @param mixed $value The PHP variable to convert + * @param int $flags A bit field of Yaml::DUMP_* constants to customize the dumped YAML string + * + * @return string The YAML string representing the PHP value + * + * @throws DumpException When trying to dump PHP resource + */ + public static function dump($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 'null'; + case $value instanceof \DateTimeInterface: + return $value->format('c'); + case \is_object($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)) { + $output = array(); + + foreach ($value as $key => $val) { + $output[] = sprintf('%s: %s', self::dump($key, $flags), self::dump($val, $flags)); + } + + return sprintf('{ %s }', implode(', ', $output)); + } + + if (Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE & $flags) { + throw new DumpException('Object support when dumping a YAML file has been disabled.'); + } + + return 'null'; + case \is_array($value): + return self::dumpArray($value, $flags); + case null === $value: + return 'null'; + case true === $value: + return 'true'; + case false === $value: + return 'false'; + case ctype_digit($value): + return \is_string($value) ? "'$value'" : (int) $value; + case is_numeric($value): + $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. + $repr = '!!float '.$repr; + } + } 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): + 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. + * + * @param array|\ArrayObject|\stdClass $value The PHP array or array-like object to check + * + * @return bool true if value is hash array, false otherwise + */ + public static function isHash($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 + * + * @return string The YAML string representing the PHP array + */ + private static function dumpArray(array $value, int $flags): string + { + // array + if (($value || Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE & $flags) && !self::isHash($value)) { + $output = array(); + foreach ($value as $val) { + $output[] = self::dump($val, $flags); + } + + return sprintf('[%s]', implode(', ', $output)); + } + + // hash + $output = array(); + foreach ($value as $key => $val) { + $output[] = sprintf('%s: %s', self::dump($key, $flags), self::dump($val, $flags)); + } + + return sprintf('{ %s }', implode(', ', $output)); + } + + /** + * Parses a YAML scalar. + * + * @return mixed + * + * @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 $references = array()) + { + if (\in_array($scalar[$i], array('"', "'"))) { + // quoted scalar + $output = self::parseQuotedScalar($scalar, $i); + + if (null !== $delimiters) { + $tmp = ltrim(substr($scalar, $i), ' '); + 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 + 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); + } + } + + return $output; + } + + /** + * Parses a YAML quoted scalar. + * + * @throws ParseException When malformed inline YAML string is parsed + */ + private static function parseQuotedScalar(string $scalar, int &$i): 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, \strlen($match[0]) - 2); + + $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()): array + { + $output = array(); + $len = \strlen($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: + $isQuoted = \in_array($sequence[$i], array('"', "'")); + $value = self::parseScalar($sequence, $flags, array(',', ']'), $i, null === $tag, $references); + + // the value can be an array if a reference has been resolved to an array var + if (\is_string($value) && !$isQuoted && false !== strpos($value, ': ')) { + // embedded mapping? + try { + $pos = 0; + $value = self::parseMapping('{'.$value.'}', $flags, $pos, $references); + } catch (\InvalidArgumentException $e) { + // no, it's not + } + } + + --$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. + * + * @return array|\stdClass + * + * @throws ParseException When malformed inline YAML string is parsed + */ + private static function parseMapping(string $mapping, int $flags, int &$i = 0, array $references = array()) + { + $output = array(); + $len = \strlen($mapping); + ++$i; + $allowOverwrite = false; + + // {foo: bar, bar:foo, ...} + while ($i < $len) { + switch ($mapping[$i]) { + case ' ': + case ',': + ++$i; + continue 2; + case '}': + if (self::$objectForMap) { + return (object) $output; + } + + return $output; + } + + // key + $offsetBeforeKeyParsing = $i; + $isKeyQuoted = \in_array($mapping[$i], array('"', "'"), true); + $key = self::parseScalar($mapping, $flags, array(':', ' '), $i, false, array()); + + if ($offsetBeforeKeyParsing === $i) { + throw new ParseException('Missing mapping key.', self::$parsedLineNumber + 1, $mapping); + } + + 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], array(' ', ',', '[', ']', '{', '}'), 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]) { + ++$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, array(',', '}'), $i, null === $tag, $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, $mapping); + } + --$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. + * + * @return mixed The evaluated YAML string + * + * @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 = array()) + { + $scalar = trim($scalar); + $scalarLower = strtolower($scalar); + + if (0 === strpos($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]; + } + + switch (true) { + case 'null' === $scalarLower: + case '' === $scalar: + case '~' === $scalar: + return; + case 'true' === $scalarLower: + return true; + case 'false' === $scalarLower: + return false; + case '!' === $scalar[0]: + switch (true) { + case 0 === strpos($scalar, '!!str '): + return (string) substr($scalar, 6); + case 0 === strpos($scalar, '! '): + return substr($scalar, 2); + case 0 === strpos($scalar, '!php/object'): + if (self::$objectSupport) { + return unserialize(self::parseScalar(substr($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; + case 0 === strpos($scalar, '!php/const'): + if (self::$constantSupport) { + $i = 0; + if (\defined($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. Have you forgotten to pass the "Yaml::PARSE_CONSTANT" flag to the parser?', $scalar), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename); + } + + return; + case 0 === strpos($scalar, '!!float '): + return (float) substr($scalar, 8); + case 0 === strpos($scalar, '!!binary '): + return self::evaluateBinaryScalar(substr($scalar, 9)); + default: + 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); + } + + // Optimize for returning strings. + // no break + case '+' === $scalar[0] || '-' === $scalar[0] || '.' === $scalar[0] || is_numeric($scalar[0]): + switch (true) { + case Parser::preg_match('{^[+-]?[0-9][0-9_]*$}', $scalar): + $scalar = str_replace('_', '', (string) $scalar); + // omitting the break / return as integers are handled in the next case + // no break + case ctype_digit($scalar): + $raw = $scalar; + $cast = (int) $scalar; + + return '0' == $scalar[0] ? octdec($scalar) : (((string) $raw == (string) $cast) ? $cast : $raw); + case '-' === $scalar[0] && ctype_digit(substr($scalar, 1)): + $raw = $scalar; + $cast = (int) $scalar; + + return '0' == $scalar[1] ? octdec($scalar) : (((string) $raw === (string) $cast) ? $cast : $raw); + case is_numeric($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): + if (Yaml::PARSE_DATETIME & $flags) { + // When no timezone is provided in the parsed date, YAML spec says we must assume UTC. + return new \DateTime($scalar, new \DateTimeZone('UTC')); + } + + $timeZone = date_default_timezone_get(); + date_default_timezone_set('UTC'); + $time = strtotime($scalar); + date_default_timezone_set($timeZone); + + return $time; + } + } + + 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, ' ', $nextOffset); + + // Is followed by a scalar and is a built-in tag + if ($tag && (!isset($value[$nextOffset]) || !\in_array($value[$nextOffset], array('[', '{'), true)) && ('!' === $tag[0] || 'str' === $tag || 'php/const' === $tag || 'php/object' === $tag)) { + // 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 || 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) + { + return !preg_match('//u', $value) || preg_match('/[^\x00\x07-\x0d\x1B\x20-\xff]/', $value); + } + + /** + * Gets a regex that matches a YAML date. + * + * @return string The regular expression + * + * @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]))?))?)? + $~x +EOF; + } + + /** + * Gets a regex that matches a YAML number in hexadecimal notation. + * + * @return string + */ + private static function getHexRegex(): string + { + return '~^0x[0-9a-f_]++$~i'; + } +} |