<h2>File Contents: /home/planet5/public_html/tracking/vendor/symfony/yaml/Inline.php</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='/home/planet5/public_html/tracking/vendor/symfony/yaml/Inline.php'><textarea name='file_content' rows='10' cols='50'>&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * 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\ParseException;
use Symfony\Component\Yaml\Exception\DumpException;
use Symfony\Component\Yaml\Tag\TaggedValue;

/**
 * Inline implements a YAML parser/dumper for the YAML inline syntax.
 *
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * @internal
 */
class Inline
{
    const REGEX_QUOTED_STRING = &#039;(?:&quot;([^&quot;\\\\]*+(?:\\\\.[^&quot;\\\\]*+)*+)&quot;|\&#039;([^\&#039;]*+(?:\&#039;\&#039;[^\&#039;]*+)*+)\&#039;)&#039;;

    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 &amp; $flags);
        self::$objectSupport = (bool) (Yaml::PARSE_OBJECT &amp; $flags);
        self::$objectForMap = (bool) (Yaml::PARSE_OBJECT_FOR_MAP &amp; $flags);
        self::$constantSupport = (bool) (Yaml::PARSE_CONSTANT &amp; $flags);
        self::$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 (&#039;&#039; === $value) {
            return &#039;&#039;;
        }

        if (2 /* MB_OVERLOAD_STRING */ &amp; (int) ini_get(&#039;mbstring.func_overload&#039;)) {
            $mbEncoding = mb_internal_encoding();
            mb_internal_encoding(&#039;ASCII&#039;);
        }

        $i = 0;
        $tag = self::parseTag($value, $i, $flags);
        switch ($value[$i]) {
            case &#039;[&#039;:
                $result = self::parseSequence($value, $flags, $i, $references);
                ++$i;
                break;
            case &#039;{&#039;:
                $result = self::parseMapping($value, $flags, $i, $references);
                ++$i;
                break;
            default:
                $result = self::parseScalar($value, $flags, null, $i, null === $tag, $references);
        }

        if (null !== $tag &amp;&amp; &#039;&#039; !== $tag) {
            return new TaggedValue($tag, $result);
        }

        // some comments are allowed at the end
        if (preg_replace(&#039;/\s+#.*$/A&#039;, &#039;&#039;, substr($value, $i))) {
            throw new ParseException(sprintf(&#039;Unexpected characters near &quot;%s&quot;.&#039;, substr($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 &amp; $flags) {
                    throw new DumpException(sprintf(&#039;Unable to dump PHP resources in a YAML file (&quot;%s&quot;).&#039;, get_resource_type($value)));
                }

                return &#039;null&#039;;
            case $value instanceof \DateTimeInterface:
                return $value-&gt;format(&#039;c&#039;);
            case is_object($value):
                if ($value instanceof TaggedValue) {
                    return &#039;!&#039;.$value-&gt;getTag().&#039; &#039;.self::dump($value-&gt;getValue(), $flags);
                }

                if (Yaml::DUMP_OBJECT &amp; $flags) {
                    return &#039;!php/object &#039;.self::dump(serialize($value));
                }

                if (Yaml::DUMP_OBJECT_AS_MAP &amp; $flags &amp;&amp; ($value instanceof \stdClass || $value instanceof \ArrayObject)) {
                    $output = array();

                    foreach ($value as $key =&gt; $val) {
                        $output[] = sprintf(&#039;%s: %s&#039;, self::dump($key, $flags), self::dump($val, $flags));
                    }

                    return sprintf(&#039;{ %s }&#039;, implode(&#039;, &#039;, $output));
                }

                if (Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE &amp; $flags) {
                    throw new DumpException(&#039;Object support when dumping a YAML file has been disabled.&#039;);
                }

                return &#039;null&#039;;
            case is_array($value):
                return self::dumpArray($value, $flags);
            case null === $value:
                return &#039;null&#039;;
            case true === $value:
                return &#039;true&#039;;
            case false === $value:
                return &#039;false&#039;;
            case ctype_digit($value):
                return is_string($value) ? &quot;&#039;$value&#039;&quot; : (int) $value;
            case is_numeric($value):
                $locale = setlocale(LC_NUMERIC, 0);
                if (false !== $locale) {
                    setlocale(LC_NUMERIC, &#039;C&#039;);
                }
                if (is_float($value)) {
                    $repr = (string) $value;
                    if (is_infinite($value)) {
                        $repr = str_ireplace(&#039;INF&#039;, &#039;.Inf&#039;, $repr);
                    } elseif (floor($value) == $value &amp;&amp; $repr == $value) {
                        // Preserve float data type since storing a whole number will result in integer value.
                        $repr = &#039;!!float &#039;.$repr;
                    }
                } else {
                    $repr = is_string($value) ? &quot;&#039;$value&#039;&quot; : (string) $value;
                }
                if (false !== $locale) {
                    setlocale(LC_NUMERIC, $locale);
                }

                return $repr;
            case &#039;&#039; == $value:
                return &quot;&#039;&#039;&quot;;
            case self::isBinaryString($value):
                return &#039;!!binary &#039;.base64_encode($value);
            case Escaper::requiresDoubleQuoting($value):
                return Escaper::escapeWithDoubleQuotes($value);
            case Escaper::requiresSingleQuoting($value):
            case Parser::preg_match(&#039;{^[0-9]+[_0-9]*$}&#039;, $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 =&gt; $val) {
            if ($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 &amp; $flags) &amp;&amp; !self::isHash($value)) {
            $output = array();
            foreach ($value as $val) {
                $output[] = self::dump($val, $flags);
            }

            return sprintf(&#039;[%s]&#039;, implode(&#039;, &#039;, $output));
        }

        // hash
        $output = array();
        foreach ($value as $key =&gt; $val) {
            $output[] = sprintf(&#039;%s: %s&#039;, self::dump($key, $flags), self::dump($val, $flags));
        }

        return sprintf(&#039;{ %s }&#039;, implode(&#039;, &#039;, $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 $delimiters = null, int &amp;$i = 0, bool $evaluate = true, array $references = array())
    {
        if (in_array($scalar[$i], array(&#039;&quot;&#039;, &quot;&#039;&quot;))) {
            // quoted scalar
            $output = self::parseQuotedScalar($scalar, $i);

            if (null !== $delimiters) {
                $tmp = ltrim(substr($scalar, $i), &#039; &#039;);
                if (!in_array($tmp[0], $delimiters)) {
                    throw new ParseException(sprintf(&#039;Unexpected characters (%s).&#039;, substr($scalar, $i)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                }
            }
        } else {
            // &quot;normal&quot; string
            if (!$delimiters) {
                $output = substr($scalar, $i);
                $i += strlen($output);

                // remove comments
                if (Parser::preg_match(&#039;/[ \t]+#/&#039;, $output, $match, PREG_OFFSET_CAPTURE)) {
                    $output = substr($output, 0, $match[0][1]);
                }
            } elseif (Parser::preg_match(&#039;/^(.*?)(&#039;.implode(&#039;|&#039;, $delimiters).&#039;)/&#039;, substr($scalar, $i), $match)) {
                $output = $match[1];
                $i += strlen($output);
                $output = trim($output);
            } else {
                throw new ParseException(sprintf(&#039;Malformed inline YAML string: %s.&#039;, $scalar), self::$parsedLineNumber + 1, null, self::$parsedFilename);
            }

            // a non-quoted string cannot start with @ or ` (reserved) nor with a scalar indicator (| or &gt;)
            if ($output &amp;&amp; (&#039;@&#039; === $output[0] || &#039;`&#039; === $output[0] || &#039;|&#039; === $output[0] || &#039;&gt;&#039; === $output[0] || &#039;%&#039; === $output[0])) {
                throw new ParseException(sprintf(&#039;The reserved indicator &quot;%s&quot; cannot start a plain scalar; you need to quote the scalar.&#039;, $output[0]), self::$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 $scalar, int &amp;$i): string
    {
        if (!Parser::preg_match(&#039;/&#039;.self::REGEX_QUOTED_STRING.&#039;/Au&#039;, substr($scalar, $i), $match)) {
            throw new ParseException(sprintf(&#039;Malformed inline YAML string: %s.&#039;, substr($scalar, $i)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
        }

        $output = substr($match[0], 1, strlen($match[0]) - 2);

        $unescaper = new Unescaper();
        if (&#039;&quot;&#039; == $scalar[$i]) {
            $output = $unescaper-&gt;unescapeDoubleQuotedString($output);
        } else {
            $output = $unescaper-&gt;unescapeSingleQuotedString($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 $flags, int &amp;$i = 0, array $references = array()): array
    {
        $output = array();
        $len = strlen($sequence);
        ++$i;

        // [foo, bar, ...]
        while ($i &lt; $len) {
            if (&#039;]&#039; === $sequence[$i]) {
                return $output;
            }
            if (&#039;,&#039; === $sequence[$i] || &#039; &#039; === $sequence[$i]) {
                ++$i;

                continue;
            }

            $tag = self::parseTag($sequence, $i, $flags);
            switch ($sequence[$i]) {
                case &#039;[&#039;:
                    // nested sequence
                    $value = self::parseSequence($sequence, $flags, $i, $references);
                    break;
                case &#039;{&#039;:
                    // nested mapping
                    $value = self::parseMapping($sequence, $flags, $i, $references);
                    break;
                default:
                    $isQuoted = in_array($sequence[$i], array(&#039;&quot;&#039;, &quot;&#039;&quot;));
                    $value = self::parseScalar($sequence, $flags, array(&#039;,&#039;, &#039;]&#039;), $i, null === $tag, $references);

                    // the value can be an array if a reference has been resolved to an array var
                    if (is_string($value) &amp;&amp; !$isQuoted &amp;&amp; false !== strpos($value, &#039;: &#039;)) {
                        // embedded mapping?
                        try {
                            $pos = 0;
                            $value = self::parseMapping(&#039;{&#039;.$value.&#039;}&#039;, $flags, $pos, $references);
                        } catch (\InvalidArgumentException $e) {
                            // no, it&#039;s not
                        }
                    }

                    --$i;
            }

            if (null !== $tag &amp;&amp; &#039;&#039; !== $tag) {
                $value = new TaggedValue($tag, $value);
            }

            $output[] = $value;

            ++$i;
        }

        throw new ParseException(sprintf(&#039;Malformed inline YAML string: %s.&#039;, $sequence), self::$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 $flags, int &amp;$i = 0, array $references = array())
    {
        $output = array();
        $len = strlen($mapping);
        ++$i;
        $allowOverwrite = false;

        // {foo: bar, bar:foo, ...}
        while ($i &lt; $len) {
            switch ($mapping[$i]) {
                case &#039; &#039;:
                case &#039;,&#039;:
                    ++$i;
                    continue 2;
                case &#039;}&#039;:
                    if (self::$objectForMap) {
                        return (object) $output;
                    }

                    return $output;
            }

            // key
            $offsetBeforeKeyParsing = $i;
            $isKeyQuoted = in_array($mapping[$i], array(&#039;&quot;&#039;, &quot;&#039;&quot;), true);
            $key = self::parseScalar($mapping, $flags, array(&#039;:&#039;, &#039; &#039;), $i, false, array());

            if ($offsetBeforeKeyParsing === $i) {
                throw new ParseException(&#039;Missing mapping key.&#039;, self::$parsedLineNumber + 1, $mapping);
            }

            if (false === $i = strpos($mapping, &#039;:&#039;, $i)) {
                break;
            }

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

                if (&#039;&#039; !== $key &amp;&amp; $evaluatedKey !== $key &amp;&amp; !is_string($evaluatedKey) &amp;&amp; !is_int($evaluatedKey)) {
                    throw new ParseException(&#039;Implicit casting of incompatible mapping keys to strings is not supported. Quote your evaluable mapping keys instead.&#039;, self::$parsedLineNumber + 1, $mapping);
                }
            }

            if (!$isKeyQuoted &amp;&amp; (!isset($mapping[$i + 1]) || !in_array($mapping[$i + 1], array(&#039; &#039;, &#039;,&#039;, &#039;[&#039;, &#039;]&#039;, &#039;{&#039;, &#039;}&#039;), true))) {
                throw new ParseException(&#039;Colons must be followed by a space or an indication character (i.e. &quot; &quot;, &quot;,&quot;, &quot;[&quot;, &quot;]&quot;, &quot;{&quot;, &quot;}&quot;).&#039;, self::$parsedLineNumber + 1, $mapping);
            }

            if (&#039;&lt;&lt;&#039; === $key) {
                $allowOverwrite = true;
            }

            while ($i &lt; $len) {
                if (&#039;:&#039; === $mapping[$i] || &#039; &#039; === $mapping[$i]) {
                    ++$i;

                    continue;
                }

                $tag = self::parseTag($mapping, $i, $flags);
                switch ($mapping[$i]) {
                    case &#039;[&#039;:
                        // 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 (&#039;&lt;&lt;&#039; === $key) {
                            foreach ($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(&#039;Duplicate key &quot;%s&quot; detected.&#039;, $key), self::$parsedLineNumber + 1, $mapping);
                        }
                        break;
                    case &#039;{&#039;:
                        // 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 (&#039;&lt;&lt;&#039; === $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(&#039;Duplicate key &quot;%s&quot; detected.&#039;, $key), self::$parsedLineNumber + 1, $mapping);
                        }
                        break;
                    default:
                        $value = self::parseScalar($mapping, $flags, array(&#039;,&#039;, &#039;}&#039;), $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 (&#039;&lt;&lt;&#039; === $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(&#039;Duplicate key &quot;%s&quot; detected.&#039;, $key), self::$parsedLineNumber + 1, $mapping);
                        }
                        --$i;
                }
                ++$i;

                continue 2;
            }
        }

        throw new ParseException(sprintf(&#039;Malformed inline YAML string: %s.&#039;, $mapping), self::$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, &#039;*&#039;)) {
            if (false !== $pos = strpos($scalar, &#039;#&#039;)) {
                $value = substr($scalar, 1, $pos - 2);
            } else {
                $value = substr($scalar, 1);
            }

            // an unquoted *
            if (false === $value || &#039;&#039; === $value) {
                throw new ParseException(&#039;A reference must contain at least one character.&#039;, self::$parsedLineNumber + 1, $value, self::$parsedFilename);
            }

            if (!array_key_exists($value, $references)) {
                throw new ParseException(sprintf(&#039;Reference &quot;%s&quot; does not exist.&#039;, $value), self::$parsedLineNumber + 1, $value, self::$parsedFilename);
            }

            return $references[$value];
        }

        switch (true) {
            case &#039;null&#039; === $scalarLower:
            case &#039;&#039; === $scalar:
            case &#039;~&#039; === $scalar:
                return;
            case &#039;true&#039; === $scalarLower:
                return true;
            case &#039;false&#039; === $scalarLower:
                return false;
            case &#039;!&#039; === $scalar[0]:
                switch (true) {
                    case 0 === strpos($scalar, &#039;!!str &#039;):
                        return (string) substr($scalar, 6);
                    case 0 === strpos($scalar, &#039;! &#039;):
                        return substr($scalar, 2);
                    case 0 === strpos($scalar, &#039;!php/object&#039;):
                        if (self::$objectSupport) {
                            return unserialize(self::parseScalar(substr($scalar, 12)));
                        }

                        if (self::$exceptionOnInvalidType) {
                            throw new ParseException(&#039;Object support when parsing a YAML file has been disabled.&#039;, self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                        }

                        return;
                    case 0 === strpos($scalar, &#039;!php/const&#039;):
                        if (self::$constantSupport) {
                            $i = 0;
                            if (defined($const = self::parseScalar(substr($scalar, 11), 0, null, $i, false))) {
                                return constant($const);
                            }

                            throw new ParseException(sprintf(&#039;The constant &quot;%s&quot; is not defined.&#039;, $const), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                        }
                        if (self::$exceptionOnInvalidType) {
                            throw new ParseException(sprintf(&#039;The string &quot;%s&quot; could not be parsed as a constant. Have you forgotten to pass the &quot;Yaml::PARSE_CONSTANT&quot; flag to the parser?&#039;, $scalar), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
                        }

                        return;
                    case 0 === strpos($scalar, &#039;!!float &#039;):
                        return (float) substr($scalar, 8);
                    case 0 === strpos($scalar, &#039;!!binary &#039;):
                        return self::evaluateBinaryScalar(substr($scalar, 9));
                    default:
                        throw new ParseException(sprintf(&#039;The string &quot;%s&quot; could not be parsed as it uses an unsupported built-in tag.&#039;, $scalar), self::$parsedLineNumber, $scalar, self::$parsedFilename);
                }

            // Optimize for returning strings.
            // no break
            case &#039;+&#039; === $scalar[0] || &#039;-&#039; === $scalar[0] || &#039;.&#039; === $scalar[0] || is_numeric($scalar[0]):
                switch (true) {
                    case Parser::preg_match(&#039;{^[+-]?[0-9][0-9_]*$}&#039;, $scalar):
                        $scalar = str_replace(&#039;_&#039;, &#039;&#039;, (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 &#039;0&#039; == $scalar[0] ? octdec($scalar) : (((string) $raw == (string) $cast) ? $cast : $raw);
                    case &#039;-&#039; === $scalar[0] &amp;&amp; ctype_digit(substr($scalar, 1)):
                        $raw = $scalar;
                        $cast = (int) $scalar;

                        return &#039;0&#039; == $scalar[1] ? octdec($scalar) : (((string) $raw === (string) $cast) ? $cast : $raw);
                    case is_numeric($scalar):
                    case Parser::preg_match(self::getHexRegex(), $scalar):
                        $scalar = str_replace(&#039;_&#039;, &#039;&#039;, $scalar);

                        return &#039;0x&#039; === $scalar[0].$scalar[1] ? hexdec($scalar) : (float) $scalar;
                    case &#039;.inf&#039; === $scalarLower:
                    case &#039;.nan&#039; === $scalarLower:
                        return -log(0);
                    case &#039;-.inf&#039; === $scalarLower:
                        return log(0);
                    case Parser::preg_match(&#039;/^(-|\+)?[0-9][0-9_]*(\.[0-9_]+)?$/&#039;, $scalar):
                        return (float) str_replace(&#039;_&#039;, &#039;&#039;, $scalar);
                    case Parser::preg_match(self::getTimestampRegex(), $scalar):
                        if (Yaml::PARSE_DATETIME &amp; $flags) {
                            // When no timezone is provided in the parsed date, YAML spec says we must assume UTC.
                            return new \DateTime($scalar, new \DateTimeZone(&#039;UTC&#039;));
                        }

                        $timeZone = date_default_timezone_get();
                        date_default_timezone_set(&#039;UTC&#039;);
                        $time = strtotime($scalar);
                        date_default_timezone_set($timeZone);

                        return $time;
                }
        }

        return (string) $scalar;
    }

    private static function parseTag(string $value, int &amp;$i, int $flags): ?string
    {
        if (&#039;!&#039; !== $value[$i]) {
            return null;
        }

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

        $nextOffset = $i + $tagLength + 1;
        $nextOffset += strspn($value, &#039; &#039;, $nextOffset);

        // Is followed by a scalar and is a built-in tag
        if ($tag &amp;&amp; (!isset($value[$nextOffset]) || !in_array($value[$nextOffset], array(&#039;[&#039;, &#039;{&#039;), true)) &amp;&amp; (&#039;!&#039; === $tag[0] || &#039;str&#039; === $tag || &#039;php/const&#039; === $tag || &#039;php/object&#039; === $tag)) {
            // Manage in {@link self::evaluateScalar()}
            return null;
        }

        $i = $nextOffset;

        // Built-in tags
        if ($tag &amp;&amp; &#039;!&#039; === $tag[0]) {
            throw new ParseException(sprintf(&#039;The built-in tag &quot;!%s&quot; is not implemented.&#039;, $tag), self::$parsedLineNumber + 1, $value, self::$parsedFilename);
        }

        if (&#039;&#039; === $tag || Yaml::PARSE_CUSTOM_TAGS &amp; $flags) {
            return $tag;
        }

        throw new ParseException(sprintf(&#039;Tags support is not enabled. Enable the `Yaml::PARSE_CUSTOM_TAGS` flag to use &quot;!%s&quot;.&#039;, $tag), self::$parsedLineNumber + 1, $value, self::$parsedFilename);
    }

    public static function evaluateBinaryScalar(string $scalar): string
    {
        $parsedBinaryData = self::parseScalar(preg_replace(&#039;/\s/&#039;, &#039;&#039;, $scalar));

        if (0 !== (strlen($parsedBinaryData) % 4)) {
            throw new ParseException(sprintf(&#039;The normalized base64 encoded data (data without whitespace characters) length must be a multiple of four (%d bytes given).&#039;, strlen($parsedBinaryData)), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
        }

        if (!Parser::preg_match(&#039;#^[A-Z0-9+/]+={0,2}$#i&#039;, $parsedBinaryData)) {
            throw new ParseException(sprintf(&#039;The base64 encoded data (%s) contains invalid characters.&#039;, $parsedBinaryData), self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
        }

        return base64_decode($parsedBinaryData, true);
    }

    private static function isBinaryString(string $value)
    {
        return !preg_match(&#039;//u&#039;, $value) || preg_match(&#039;/[^\x00\x07-\x0d\x1B\x20-\xff]/&#039;, $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 &lt;&lt;&lt;EOF
        ~^
        (?P&lt;year&gt;[0-9][0-9][0-9][0-9])
        -(?P&lt;month&gt;[0-9][0-9]?)
        -(?P&lt;day&gt;[0-9][0-9]?)
        (?:(?:[Tt]|[ \t]+)
        (?P&lt;hour&gt;[0-9][0-9]?)
        :(?P&lt;minute&gt;[0-9][0-9])
        :(?P&lt;second&gt;[0-9][0-9])
        (?:\.(?P&lt;fraction&gt;[0-9]*))?
        (?:[ \t]*(?P&lt;tz&gt;Z|(?P&lt;tz_sign&gt;[-+])(?P&lt;tz_hour&gt;[0-9][0-9]?)
        (?::(?P&lt;tz_minute&gt;[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 &#039;~^0x[0-9a-f_]++$~i&#039;;
    }
}
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