comparison vendor/symfony/yaml/Inline.php @ 0:c75dbcec494b

Initial commit from drush-created site

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[e-mail]>
+ *
+ * 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 <[e-mail]>
+ *
+ * @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  $references Mapping of variable names to values
+     *
+     * @return mixed A PHP value
+     *
+     * @throws ParseException
+     */
+    public static function parse($value, $flags = 0, $references = array())
+    {
+        if (is_bool($flags)) {
+            @trigger_error('Passing a boolean flag to toggle exception handling is deprecated since Symfony 3.1 and will be removed in 4.0. Use the Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE flag instead.', E_USER_DEPRECATED);
+
+            if ($flags) {
+                $flags = Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE;
+            } else {
+                $flags = 0;
+            }
+        }
+
+        if (func_num_args() >= 3 && !is_array($references)) {
+            @trigger_error('Passing a boolean flag to toggle object support is deprecated since Symfony 3.1 and will be removed in 4.0. Use the Yaml::PARSE_OBJECT flag instead.', E_USER_DEPRECATED);
+
+            if ($references) {
+                $flags |= Yaml::PARSE_OBJECT;
+            }
+
+            if (func_num_args() >= 4) {
+                @trigger_error('Passing a boolean flag to toggle object for map support is deprecated since Symfony 3.1 and will be removed in 4.0. Use the Yaml::PARSE_OBJECT_FOR_MAP flag instead.', E_USER_DEPRECATED);
+
+                if (func_get_arg(3)) {
+                    $flags |= Yaml::PARSE_OBJECT_FOR_MAP;
+                }
+            }
+
+            if (func_num_args() >= 5) {
+                $references = func_get_arg(4);
+            } else {
+                $references = array();
+            }
+        }
+
+        self::initialize($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 !== $tag) {
+            return new TaggedValue($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, $flags = 0)
+    {
+        if (is_bool($flags)) {
+            @trigger_error('Passing a boolean flag to toggle exception handling is deprecated since Symfony 3.1 and will be removed in 4.0. Use the Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE flag instead.', E_USER_DEPRECATED);
+
+            if ($flags) {
+                $flags = Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE;
+            } else {
+                $flags = 0;
+            }
+        }
+
+        if (func_num_args() >= 3) {
+            @trigger_error('Passing a boolean flag to toggle object support is deprecated since Symfony 3.1 and will be removed in 4.0. Use the Yaml::DUMP_OBJECT flag instead.', E_USER_DEPRECATED);
+
+            if (func_get_arg(2)) {
+                $flags |= Yaml::DUMP_OBJECT;
+            }
+        }
+
+        switch (true) {
+            case is_resource($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 || $value instanceof \ArrayObject)) {
+                    return self::dumpArray($value, $flags & ~Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE);
+                }
+
+                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.
+     *
+     * @internal
+     *
+     * @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)
+    {
+        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   $flags A bit field of Yaml::DUMP_* constants to customize the dumped YAML string
+     *
+     * @return string The YAML string representing the PHP array
+     */
+    private static function dumpArray($value, $flags)
+    {
+        // array
+        if (($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.
+     *
+     * @param string   $scalar
+     * @param int      $flags
+     * @param string[] $delimiters
+     * @param int      &$i
+     * @param bool     $evaluate
+     * @param array    $references
+     *
+     * @return string
+     *
+     * @throws ParseException When malformed inline YAML string is parsed
+     *
+     * @internal
+     */
+    public static function parseScalar($scalar, $flags = 0, $delimiters = null, &$i = 0, $evaluate = true, $references = array(), $legacyOmittedKeySupport = false)
+    {
+        if (in_array($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, $match[0][1]);
+                }
+            } elseif (Parser::preg_match('/^(.'.($legacyOmittedKeySupport ? '+' : '*').'?)('.implode('|', $delimiters).')/', substr($scalar, $i), $match)) {
+                $output = $match[1];
+                $i += strlen($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])) {
+                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 ($output && '%' === $output[0]) {
+                @trigger_error(self::getDeprecationMessage(sprintf('Not quoting the scalar "%s" starting with the "%%" indicator character is deprecated since Symfony 3.1 and will throw a ParseException in 4.0.', $output)), E_USER_DEPRECATED);
+            }
+
+            if ($evaluate) {
+                $output = self::evaluateScalar($output, $flags, $references);
+            }
+        }
+
+        return $output;
+    }
+
+    /**
+     * Parses a YAML quoted scalar.
+     *
+     * @param string $scalar
+     * @param int    &$i
+     *
+     * @return string
+     *
+     * @throws ParseException When malformed inline YAML string is parsed
+     */
+    private static function parseQuotedScalar($scalar, &$i)
+    {
+        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.
+     *
+     * @param string $sequence
+     * @param int    $flags
+     * @param int    &$i
+     * @param array  $references
+     *
+     * @return array
+     *
+     * @throws ParseException When malformed inline YAML string is parsed
+     */
+    private static function parseSequence($sequence, $flags, &$i = 0, $references = 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) {
+                $value = new TaggedValue($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.
+     *
+     * @param string $mapping
+     * @param int    $flags
+     * @param int    &$i
+     * @param array  $references
+     *
+     * @return array|\stdClass
+     *
+     * @throws ParseException When malformed inline YAML string is parsed
+     */
+    private static function parseMapping($mapping, $flags, &$i = 0, $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
+            $isKeyQuoted = in_array($mapping[$i], array('"', "'"), true);
+            $key = self::parseScalar($mapping, $flags, array(':', ' '), $i, false, array(), true);
+
+            if (':' !== $key && false === $i = strpos($mapping, ':', $i)) {
+                break;
+            }
+
+            if (':' === $key) {
+                @trigger_error(self::getDeprecationMessage('Omitting the key of a mapping is deprecated and will throw a ParseException in 4.0.'), E_USER_DEPRECATED);
+            }
+
+            if (!$isKeyQuoted) {
+                $evaluatedKey = self::evaluateScalar($key, $flags, $references);
+
+                if ('' !== $key && $evaluatedKey !== $key && !is_string($evaluatedKey) && !is_int($evaluatedKey)) {
+                    @trigger_error(self::getDeprecationMessage('Implicit casting of incompatible mapping keys to strings is deprecated since Symfony 3.3 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0. Quote your evaluable mapping keys instead.'), E_USER_DEPRECATED);
+                }
+            }
+
+            if (':' !== $key && !$isKeyQuoted && (!isset($mapping[$i + 1]) || !in_array($mapping[$i + 1], array(' ', ',', '[', ']', '{', '}'), true))) {
+                @trigger_error(self::getDeprecationMessage('Using a colon after an unquoted mapping key that is not followed by an indication character (i.e. " ", ",", "[", "]", "{", "}") is deprecated since Symfony 3.2 and will throw a ParseException in 4.0.'), E_USER_DEPRECATED);
+            }
+
+            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])) {
+                            @trigger_error(self::getDeprecationMessage(sprintf('Duplicate key "%s" detected whilst parsing YAML. Silent handling of duplicate mapping keys in YAML is deprecated since Symfony 3.2 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0.', $key)), E_USER_DEPRECATED);
+                        }
+                        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])) {
+                            @trigger_error(self::getDeprecationMessage(sprintf('Duplicate key "%s" detected whilst parsing YAML. Silent handling of duplicate mapping keys in YAML is deprecated since Symfony 3.2 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0.', $key)), E_USER_DEPRECATED);
+                        }
+                        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])) {
+                            @trigger_error(self::getDeprecationMessage(sprintf('Duplicate key "%s" detected whilst parsing YAML. Silent handling of duplicate mapping keys in YAML is deprecated since Symfony 3.2 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0.', $key)), E_USER_DEPRECATED);
+                        }
+                        --$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.
+     *
+     * @param string $scalar
+     * @param int    $flags
+     * @param array  $references
+     *
+     * @return mixed The evaluated YAML string
+     *
+     * @throws ParseException when object parsing support was disabled and the parser detected a PHP object or when a reference could not be resolved
+     */
+    private static function evaluateScalar($scalar, $flags, $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'):
+                        @trigger_error(self::getDeprecationMessage('Support for the !str tag is deprecated since Symfony 3.4. Use the !!str tag instead.'), E_USER_DEPRECATED);
+
+                        return (string) substr($scalar, 5);
+                    case 0 === strpos($scalar, '!!str '):
+                        return (string) substr($scalar, 6);
+                    case 0 === strpos($scalar, '! '):
+                        @trigger_error(self::getDeprecationMessage('Using the non-specific tag "!" is deprecated since Symfony 3.4 as its behavior will change in 4.0. It will force non-evaluating your values in 4.0. Use plain integers or !!float instead.'), E_USER_DEPRECATED);
+
+                        return (int) self::parseScalar(substr($scalar, 2), $flags);
+                    case 0 === strpos($scalar, '!php/object:'):
+                        if (self::$objectSupport) {
+                            @trigger_error(self::getDeprecationMessage('The !php/object: tag to indicate dumped PHP objects is deprecated since Symfony 3.4 and will be removed in 4.0. Use the !php/object (without the colon) tag instead.'), E_USER_DEPRECATED);
+
+                            return unserialize(substr($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($scalar, '!!php/object:'):
+                        if (self::$objectSupport) {
+                            @trigger_error(self::getDeprecationMessage('The !!php/object: tag to indicate dumped PHP objects is deprecated since Symfony 3.1 and will be removed in 4.0. Use the !php/object (without the colon) tag instead.'), E_USER_DEPRECATED);
+
+                            return unserialize(substr($scalar, 13));
+                        }
+
+                        if (self::$exceptionOnInvalidType) {
+                            throw new ParseException('Object support when parsing a YAML file has been disabled.', self::$parsedLineNumber + 1, $scalar, self::$parsedFilename);
+                        }
+
+                        return;
+                    case 0 === strpos($scalar, '!php/object'):
+                        if (self::$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) {
+                            @trigger_error(self::getDeprecationMessage('The !php/const: tag to indicate dumped PHP constants is deprecated since Symfony 3.4 and will be removed in 4.0. Use the !php/const (without the colon) tag instead.'), E_USER_DEPRECATED);
+
+                            if (defined($const = substr($scalar, 11))) {
+                                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($scalar, '!php/const'):
+                        if (self::$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:
+                        @trigger_error(self::getDeprecationMessage(sprintf('Using the unquoted scalar value "%s" is deprecated since Symfony 3.3 and will be considered as a tagged value in 4.0. You must quote it.', $scalar)), E_USER_DEPRECATED);
+                }
+
+            // 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' === $scalarLower:
+                        return log(0);
+                    case Parser::preg_match('/^(-|\+)?[0-9][0-9,]*(\.[0-9_]+)?$/', $scalar):
+                    case Parser::preg_match('/^(-|\+)?[0-9][0-9_]*(\.[0-9_]+)?$/', $scalar):
+                        if (false !== strpos($scalar, ',')) {
+                            @trigger_error(self::getDeprecationMessage('Using the comma as a group separator for floats is deprecated since Symfony 3.2 and will be removed in 4.0.'), E_USER_DEPRECATED);
+                        }
+
+                        return (float) str_replace(array(',', '_'), '', $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;
+    }
+
+    /**
+     * @param string $value
+     * @param int    &$i
+     * @param int    $flags
+     *
+     * @return null|string
+     */
+    private static function parseTag($value, &$i, $flags)
+    {
+        if ('!' !== $value[$i]) {
+            return;
+        }
+
+        $tagLength = strcspn($value, " \t\n", $i + 1);
+        $tag = substr($value, $i + 1, $tagLength);
+
+        $nextOffset = $i + $tagLength + 1;
+        $nextOffset += strspn($value, ' ', $nextOffset);
+
+        // Is followed by a scalar
+        if ((!isset($value[$nextOffset]) || !in_array($value[$nextOffset], array('[', '{'), true)) && 'tagged' !== $tag) {
+            // Manage non-whitelisted scalars in {@link self::evaluateScalar()}
+            return;
+        }
+
+        // Built-in tags
+        if ($tag && '!' === $tag[0]) {
+            throw new ParseException(sprintf('The built-in tag "!%s" is not implemented.', $tag), self::$parsedLineNumber + 1, $value, self::$parsedFilename);
+        }
+
+        if (Yaml::PARSE_CUSTOM_TAGS & $flags) {
+            $i = $nextOffset;
+
+            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);
+    }
+
+    /**
+     * @param string $scalar
+     *
+     * @return string
+     *
+     * @internal
+     */
+    public static function evaluateBinaryScalar($scalar)
+    {
+        $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($parsedBinaryData, true);
+    }
+
+    private static function isBinaryString($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()
+    {
+        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]))?))?)?
+        $~x
+EOF;
+    }
+
+    /**
+     * Gets a regex that matches a YAML number in hexadecimal notation.
+     *
+     * @return string
+     */
+    private static function getHexRegex()
+    {
+        return '~^0x[0-9a-f_]++$~i';
+    }
+
+    private static function getDeprecationMessage($message)
+    {
+        $message = rtrim($message, '.');
+
+        if (null !== self::$parsedFilename) {
+            $message .= ' in '.self::$parsedFilename;
+        }
+
+        if (-1 !== self::$parsedLineNumber) {
+            $message .= ' on line '.(self::$parsedLineNumber + 1);
+        }
+
+        return $message.'.';
+    }
+}