class Inline in Zircon Profile 8

Inline implements a YAML parser/dumper for the YAML inline syntax.

@author Fabien Potencier <[e-mail]>

Hierarchy

• class \Symfony\Component\Yaml\Inline

1 file declares its use of Inline

InlineTest.php in vendor/symfony/yaml/Tests/InlineTest.php

2 string references to 'Inline'

EntityViewDisplayEditForm::getFieldLabelOptions in core/modules/field_ui/src/Form/EntityViewDisplayEditForm.php

Returns an array of visibility options for field labels.

views.row.schema.yml in core/modules/views/config/schema/views.row.schema.yml

core/modules/views/config/schema/views.row.schema.yml

File

vendor/symfony/yaml/Inline.php, line 22

Namespace

Symfony\Component\Yaml

class Inline {
  const REGEX_QUOTED_STRING = '(?:"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'([^\']*(?:\'\'[^\']*)*)\')';
  private static $exceptionOnInvalidType = false;
  private static $objectSupport = false;
  private static $objectForMap = false;

  /**
   * Converts a YAML string to a PHP array.
   *
   * @param string $value                  A YAML string
   * @param bool   $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise
   * @param bool   $objectSupport          true if object support is enabled, false otherwise
   * @param bool   $objectForMap           true if maps should return a stdClass instead of array()
   * @param array  $references             Mapping of variable names to values
   *
   * @return array A PHP array representing the YAML string
   *
   * @throws ParseException
   */
  public static function parse($value, $exceptionOnInvalidType = false, $objectSupport = false, $objectForMap = false, $references = array()) {
    self::$exceptionOnInvalidType = $exceptionOnInvalidType;
    self::$objectSupport = $objectSupport;
    self::$objectForMap = $objectForMap;
    $value = trim($value);
    if ('' === $value) {
      return '';
    }
    if (function_exists('mb_internal_encoding') && (int) ini_get('mbstring.func_overload') & 2) {
      $mbEncoding = mb_internal_encoding();
      mb_internal_encoding('ASCII');
    }
    $i = 0;
    switch ($value[0]) {
      case '[':
        $result = self::parseSequence($value, $i, $references);
        ++$i;
        break;
      case '{':
        $result = self::parseMapping($value, $i, $references);
        ++$i;
        break;
      default:
        $result = self::parseScalar($value, null, array(
          '"',
          "'",
        ), $i, true, $references);
    }

    // some comments are allowed at the end
    if (preg_replace('/\\s+#.*$/A', '', substr($value, $i))) {
      throw new ParseException(sprintf('Unexpected characters near "%s".', substr($value, $i)));
    }
    if (isset($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 bool  $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise
   * @param bool  $objectSupport          true if object support is enabled, false otherwise
   *
   * @return string The YAML string representing the PHP array
   *
   * @throws DumpException When trying to dump PHP resource
   */
  public static function dump($value, $exceptionOnInvalidType = false, $objectSupport = false) {
    switch (true) {
      case is_resource($value):
        if ($exceptionOnInvalidType) {
          throw new DumpException(sprintf('Unable to dump PHP resources in a YAML file ("%s").', get_resource_type($value)));
        }
        return 'null';
      case is_object($value):
        if ($objectSupport) {
          return '!!php/object:' . serialize($value);
        }
        if ($exceptionOnInvalidType) {
          throw new DumpException('Object support when dumping a YAML file has been disabled.');
        }
        return 'null';
      case is_array($value):
        return self::dumpArray($value, $exceptionOnInvalidType, $objectSupport);
      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 '' == $value:
        return "''";
      case Escaper::requiresDoubleQuoting($value):
        return Escaper::escapeWithDoubleQuotes($value);
      case Escaper::requiresSingleQuoting($value):
      case preg_match(self::getHexRegex(), $value):
      case preg_match(self::getTimestampRegex(), $value):
        return Escaper::escapeWithSingleQuotes($value);
      default:
        return $value;
    }
  }

  /**
   * Dumps a PHP array to a YAML string.
   *
   * @param array $value                  The PHP array to dump
   * @param bool  $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise
   * @param bool  $objectSupport          true if object support is enabled, false otherwise
   *
   * @return string The YAML string representing the PHP array
   */
  private static function dumpArray($value, $exceptionOnInvalidType, $objectSupport) {

    // array
    $keys = array_keys($value);
    $keysCount = count($keys);
    if (1 === $keysCount && '0' == $keys[0] || $keysCount > 1 && array_reduce($keys, function ($v, $w) {
      return (int) $v + $w;
    }, 0) === $keysCount * ($keysCount - 1) / 2) {
      $output = array();
      foreach ($value as $val) {
        $output[] = self::dump($val, $exceptionOnInvalidType, $objectSupport);
      }
      return sprintf('[%s]', implode(', ', $output));
    }

    // mapping
    $output = array();
    foreach ($value as $key => $val) {
      $output[] = sprintf('%s: %s', self::dump($key, $exceptionOnInvalidType, $objectSupport), self::dump($val, $exceptionOnInvalidType, $objectSupport));
    }
    return sprintf('{ %s }', implode(', ', $output));
  }

  /**
   * Parses a scalar to a YAML string.
   *
   * @param string $scalar
   * @param string $delimiters
   * @param array  $stringDelimiters
   * @param int    &$i
   * @param bool   $evaluate
   * @param array  $references
   *
   * @return string A YAML string
   *
   * @throws ParseException When malformed inline YAML string is parsed
   */
  public static function parseScalar($scalar, $delimiters = null, $stringDelimiters = array(
    '"',
    "'",
  ), &$i = 0, $evaluate = true, $references = array()) {
    if (in_array($scalar[$i], $stringDelimiters)) {

      // quoted scalar
      $output = self::parseQuotedScalar($scalar, $i);
      if (null !== $delimiters) {
        $tmp = ltrim(substr($scalar, $i), ' ');
        if (!in_array($tmp[0], $delimiters)) {
          throw new ParseException(sprintf('Unexpected characters (%s).', substr($scalar, $i)));
        }
      }
    }
    else {

      // "normal" string
      if (!$delimiters) {
        $output = substr($scalar, $i);
        $i += strlen($output);

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

  /**
   * Parses a quoted scalar to YAML.
   *
   * @param string $scalar
   * @param int    &$i
   *
   * @return string A YAML string
   *
   * @throws ParseException When malformed inline YAML string is parsed
   */
  private static function parseQuotedScalar($scalar, &$i) {
    if (!preg_match('/' . self::REGEX_QUOTED_STRING . '/Au', substr($scalar, $i), $match)) {
      throw new ParseException(sprintf('Malformed inline YAML string (%s).', substr($scalar, $i)));
    }
    $output = substr($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 sequence to a YAML string.
   *
   * @param string $sequence
   * @param int    &$i
   * @param array  $references
   *
   * @return string A YAML string
   *
   * @throws ParseException When malformed inline YAML string is parsed
   */
  private static function parseSequence($sequence, &$i = 0, $references = array()) {
    $output = array();
    $len = strlen($sequence);
    ++$i;

    // [foo, bar, ...]
    while ($i < $len) {
      switch ($sequence[$i]) {
        case '[':

          // nested sequence
          $output[] = self::parseSequence($sequence, $i, $references);
          break;
        case '{':

          // nested mapping
          $output[] = self::parseMapping($sequence, $i, $references);
          break;
        case ']':
          return $output;
        case ',':
        case ' ':
          break;
        default:
          $isQuoted = in_array($sequence[$i], array(
            '"',
            "'",
          ));
          $value = self::parseScalar($sequence, array(
            ',',
            ']',
          ), array(
            '"',
            "'",
          ), $i, true, $references);

          // the value can be an array if a reference has been resolved to an array var
          if (!is_array($value) && !$isQuoted && false !== strpos($value, ': ')) {

            // embedded mapping?
            try {
              $pos = 0;
              $value = self::parseMapping('{' . $value . '}', $pos, $references);
            } catch (\InvalidArgumentException $e) {

              // no, it's not
            }
          }
          $output[] = $value;
          --$i;
      }
      ++$i;
    }
    throw new ParseException(sprintf('Malformed inline YAML string %s', $sequence));
  }

  /**
   * Parses a mapping to a YAML string.
   *
   * @param string $mapping
   * @param int    &$i
   * @param array  $references
   *
   * @return string A YAML string
   *
   * @throws ParseException When malformed inline YAML string is parsed
   */
  private static function parseMapping($mapping, &$i = 0, $references = array()) {
    $output = array();
    $len = strlen($mapping);
    ++$i;

    // {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
      $key = self::parseScalar($mapping, array(
        ':',
        ' ',
      ), array(
        '"',
        "'",
      ), $i, false);

      // value
      $done = false;
      while ($i < $len) {
        switch ($mapping[$i]) {
          case '[':

            // nested sequence
            $value = self::parseSequence($mapping, $i, $references);

            // Spec: Keys MUST be unique; first one wins.
            // Parser cannot abort this mapping earlier, since lines
            // are processed sequentially.
            if (!isset($output[$key])) {
              $output[$key] = $value;
            }
            $done = true;
            break;
          case '{':

            // nested mapping
            $value = self::parseMapping($mapping, $i, $references);

            // Spec: Keys MUST be unique; first one wins.
            // Parser cannot abort this mapping earlier, since lines
            // are processed sequentially.
            if (!isset($output[$key])) {
              $output[$key] = $value;
            }
            $done = true;
            break;
          case ':':
          case ' ':
            break;
          default:
            $value = self::parseScalar($mapping, array(
              ',',
              '}',
            ), array(
              '"',
              "'",
            ), $i, true, $references);

            // Spec: Keys MUST be unique; first one wins.
            // Parser cannot abort this mapping earlier, since lines
            // are processed sequentially.
            if (!isset($output[$key])) {
              $output[$key] = $value;
            }
            $done = true;
            --$i;
        }
        ++$i;
        if ($done) {
          continue 2;
        }
      }
    }
    throw new ParseException(sprintf('Malformed inline YAML string %s', $mapping));
  }

  /**
   * Evaluates scalars and replaces magic values.
   *
   * @param string $scalar
   * @param array  $references
   *
   * @return string A YAML string
   *
   * @throws ParseException when object parsing support was disabled and the parser detected a PHP object or when a reference could not be resolved
   */
  private static function evaluateScalar($scalar, $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 || '' === $value) {
        throw new ParseException('A reference must contain at least one character.');
      }
      if (!array_key_exists($value, $references)) {
        throw new ParseException(sprintf('Reference "%s" does not exist.', $value));
      }
      return $references[$value];
    }
    switch (true) {
      case 'null' === $scalarLower:
      case '' === $scalar:
      case '~' === $scalar:
        return;
      case 'true' === $scalarLower:
        return true;
      case 'false' === $scalarLower:
        return false;

      // Optimise for returning strings.
      case $scalar[0] === '+' || $scalar[0] === '-' || $scalar[0] === '.' || $scalar[0] === '!' || is_numeric($scalar[0]):
        switch (true) {
          case 0 === strpos($scalar, '!str'):
            return (string) substr($scalar, 5);
          case 0 === strpos($scalar, '! '):
            return (int) self::parseScalar(substr($scalar, 2));
          case 0 === strpos($scalar, '!!php/object:'):
            if (self::$objectSupport) {
              return unserialize(substr($scalar, 13));
            }
            if (self::$exceptionOnInvalidType) {
              throw new ParseException('Object support when parsing a YAML file has been disabled.');
            }
            return;
          case 0 === strpos($scalar, '!!float '):
            return (double) substr($scalar, 8);
          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 preg_match(self::getHexRegex(), $scalar):
            return '0x' === $scalar[0] . $scalar[1] ? hexdec($scalar) : (double) $scalar;
          case '.inf' === $scalarLower:
          case '.nan' === $scalarLower:
            return -log(0);
          case '-.inf' === $scalarLower:
            return log(0);
          case preg_match('/^(-|\\+)?[0-9,]+(\\.[0-9]+)?$/', $scalar):
            return (double) str_replace(',', '', $scalar);
          case preg_match(self::getTimestampRegex(), $scalar):
            return strtotime($scalar);
        }
      default:
        return (string) $scalar;
    }
  }

  /**
   * 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';
  }

}

Members

Name	Modifiers	Type	Description	Overrides
Inline::$exceptionOnInvalidType	private static	property
Inline::$objectForMap	private static	property
Inline::$objectSupport	private static	property
Inline::dump	public static	function	Dumps a given PHP variable to a YAML string.
Inline::dumpArray	private static	function	Dumps a PHP array to a YAML string.
Inline::evaluateScalar	private static	function	Evaluates scalars and replaces magic values.
Inline::getHexRegex	private static	function	Gets a regex that matches a YAML number in hexadecimal notation.
Inline::getTimestampRegex	private static	function	Gets a regex that matches a YAML date.
Inline::parse	public static	function	Converts a YAML string to a PHP array.
Inline::parseMapping	private static	function	Parses a mapping to a YAML string.
Inline::parseQuotedScalar	private static	function	Parses a quoted scalar to YAML.
Inline::parseScalar	public static	function	Parses a scalar to a YAML string.
Inline::parseSequence	private static	function	Parses a sequence to a YAML string.
Inline::REGEX_QUOTED_STRING		constant