Parser.php in Loft Data Grids 7.2

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vendor/symfony/yaml/Parser.php
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<?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\ParseException;

/**
 * Parser parses YAML strings to convert them to PHP arrays.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Parser {
  const BLOCK_SCALAR_HEADER_PATTERN = '(?P<separator>\\||>)(?P<modifiers>\\+|\\-|\\d+|\\+\\d+|\\-\\d+|\\d+\\+|\\d+\\-)?(?P<comments> +#.*)?';

  // BC - wrongly named
  const FOLDED_SCALAR_PATTERN = self::BLOCK_SCALAR_HEADER_PATTERN;
  private $offset = 0;
  private $totalNumberOfLines;
  private $lines = array();
  private $currentLineNb = -1;
  private $currentLine = '';
  private $refs = array();
  private $skippedLineNumbers = array();
  private $locallySkippedLineNumbers = array();

  /**
   * @param int      $offset             The offset of YAML document (used for line numbers in error messages)
   * @param int|null $totalNumberOfLines The overall number of lines being parsed
   * @param int[]    $skippedLineNumbers Number of comment lines that have been skipped by the parser
   */
  public function __construct($offset = 0, $totalNumberOfLines = null, array $skippedLineNumbers = array()) {
    $this->offset = $offset;
    $this->totalNumberOfLines = $totalNumberOfLines;
    $this->skippedLineNumbers = $skippedLineNumbers;
  }

  /**
   * Parses a YAML string to a PHP value.
   *
   * @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   $objectForMap           True if maps should return a stdClass instead of array()
   *
   * @return mixed A PHP value
   *
   * @throws ParseException If the YAML is not valid
   */
  public function parse($value, $exceptionOnInvalidType = false, $objectSupport = false, $objectForMap = false) {
    if (false === preg_match('//u', $value)) {
      throw new ParseException('The YAML value does not appear to be valid UTF-8.');
    }
    $this->refs = array();
    $mbEncoding = null;
    $e = null;
    $data = null;
    if (2 & (int) ini_get('mbstring.func_overload')) {
      $mbEncoding = mb_internal_encoding();
      mb_internal_encoding('UTF-8');
    }
    try {
      $data = $this
        ->doParse($value, $exceptionOnInvalidType, $objectSupport, $objectForMap);
    } catch (\Exception $e) {
    } catch (\Throwable $e) {
    }
    if (null !== $mbEncoding) {
      mb_internal_encoding($mbEncoding);
    }
    $this->lines = array();
    $this->currentLine = '';
    $this->refs = array();
    $this->skippedLineNumbers = array();
    $this->locallySkippedLineNumbers = array();
    if (null !== $e) {
      throw $e;
    }
    return $data;
  }
  private function doParse($value, $exceptionOnInvalidType = false, $objectSupport = false, $objectForMap = false) {
    $this->currentLineNb = -1;
    $this->currentLine = '';
    $value = $this
      ->cleanup($value);
    $this->lines = explode("\n", $value);
    $this->locallySkippedLineNumbers = array();
    if (null === $this->totalNumberOfLines) {
      $this->totalNumberOfLines = count($this->lines);
    }
    $data = array();
    $context = null;
    $allowOverwrite = false;
    while ($this
      ->moveToNextLine()) {
      if ($this
        ->isCurrentLineEmpty()) {
        continue;
      }

      // tab?
      if ("\t" === $this->currentLine[0]) {
        throw new ParseException('A YAML file cannot contain tabs as indentation.', $this
          ->getRealCurrentLineNb() + 1, $this->currentLine);
      }
      $isRef = $mergeNode = false;
      if (self::preg_match('#^\\-((?P<leadspaces>\\s+)(?P<value>.+))?$#u', rtrim($this->currentLine), $values)) {
        if ($context && 'mapping' == $context) {
          throw new ParseException('You cannot define a sequence item when in a mapping', $this
            ->getRealCurrentLineNb() + 1, $this->currentLine);
        }
        $context = 'sequence';
        if (isset($values['value']) && self::preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#u', $values['value'], $matches)) {
          $isRef = $matches['ref'];
          $values['value'] = $matches['value'];
        }

        // array
        if (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#')) {
          $data[] = $this
            ->parseBlock($this
            ->getRealCurrentLineNb() + 1, $this
            ->getNextEmbedBlock(null, true), $exceptionOnInvalidType, $objectSupport, $objectForMap);
        }
        else {
          if (isset($values['leadspaces']) && self::preg_match('#^(?P<key>' . Inline::REGEX_QUOTED_STRING . '|[^ \'"\\{\\[].*?) *\\:(\\s+(?P<value>.+))?$#u', rtrim($values['value']), $matches)) {

            // this is a compact notation element, add to next block and parse
            $block = $values['value'];
            if ($this
              ->isNextLineIndented()) {
              $block .= "\n" . $this
                ->getNextEmbedBlock($this
                ->getCurrentLineIndentation() + strlen($values['leadspaces']) + 1);
            }
            $data[] = $this
              ->parseBlock($this
              ->getRealCurrentLineNb(), $block, $exceptionOnInvalidType, $objectSupport, $objectForMap);
          }
          else {
            $data[] = $this
              ->parseValue($values['value'], $exceptionOnInvalidType, $objectSupport, $objectForMap, $context);
          }
        }
        if ($isRef) {
          $this->refs[$isRef] = end($data);
        }
      }
      elseif (self::preg_match('#^(?P<key>' . Inline::REGEX_QUOTED_STRING . '|[^ \'"\\[\\{].*?) *\\:(\\s+(?P<value>.+))?$#u', rtrim($this->currentLine), $values) && (false === strpos($values['key'], ' #') || in_array($values['key'][0], array(
        '"',
        "'",
      )))) {
        if ($context && 'sequence' == $context) {
          throw new ParseException('You cannot define a mapping item when in a sequence', $this->currentLineNb + 1, $this->currentLine);
        }
        $context = 'mapping';

        // force correct settings
        Inline::parse(null, $exceptionOnInvalidType, $objectSupport, $objectForMap, $this->refs);
        try {
          $key = Inline::parseScalar($values['key']);
        } catch (ParseException $e) {
          $e
            ->setParsedLine($this
            ->getRealCurrentLineNb() + 1);
          $e
            ->setSnippet($this->currentLine);
          throw $e;
        }

        // Convert float keys to strings, to avoid being converted to integers by PHP
        if (is_float($key)) {
          $key = (string) $key;
        }
        if ('<<' === $key && (!isset($values['value']) || !self::preg_match('#^&(?P<ref>[^ ]+)#u', $values['value'], $refMatches))) {
          $mergeNode = true;
          $allowOverwrite = true;
          if (isset($values['value']) && 0 === strpos($values['value'], '*')) {
            $refName = substr($values['value'], 1);
            if (!array_key_exists($refName, $this->refs)) {
              throw new ParseException(sprintf('Reference "%s" does not exist.', $refName), $this
                ->getRealCurrentLineNb() + 1, $this->currentLine);
            }
            $refValue = $this->refs[$refName];
            if (!is_array($refValue)) {
              throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this
                ->getRealCurrentLineNb() + 1, $this->currentLine);
            }
            $data += $refValue;

            // array union
          }
          else {
            if (isset($values['value']) && '' !== $values['value']) {
              $value = $values['value'];
            }
            else {
              $value = $this
                ->getNextEmbedBlock();
            }
            $parsed = $this
              ->parseBlock($this
              ->getRealCurrentLineNb() + 1, $value, $exceptionOnInvalidType, $objectSupport, $objectForMap);
            if (!is_array($parsed)) {
              throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this
                ->getRealCurrentLineNb() + 1, $this->currentLine);
            }
            if (isset($parsed[0])) {

              // If the value associated with the merge key is a sequence, then this sequence is expected to contain mapping nodes
              // and each of these nodes is merged in turn according to its order in the sequence. Keys in mapping nodes earlier
              // in the sequence override keys specified in later mapping nodes.
              foreach ($parsed as $parsedItem) {
                if (!is_array($parsedItem)) {
                  throw new ParseException('Merge items must be arrays.', $this
                    ->getRealCurrentLineNb() + 1, $parsedItem);
                }
                $data += $parsedItem;

                // array union
              }
            }
            else {

              // If the value associated with the key is a single mapping node, each of its key/value pairs is inserted into the
              // current mapping, unless the key already exists in it.
              $data += $parsed;

              // array union
            }
          }
        }
        elseif ('<<' !== $key && isset($values['value']) && self::preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#u', $values['value'], $matches)) {
          $isRef = $matches['ref'];
          $values['value'] = $matches['value'];
        }
        if ($mergeNode) {

          // Merge keys
        }
        elseif (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#') || '<<' === $key) {

          // hash
          // if next line is less indented or equal, then it means that the current value is null
          if (!$this
            ->isNextLineIndented() && !$this
            ->isNextLineUnIndentedCollection()) {

            // Spec: Keys MUST be unique; first one wins.
            // But overwriting is allowed when a merge node is used in current block.
            if ($allowOverwrite || !isset($data[$key])) {
              $data[$key] = null;
            }
          }
          else {
            $value = $this
              ->parseBlock($this
              ->getRealCurrentLineNb() + 1, $this
              ->getNextEmbedBlock(), $exceptionOnInvalidType, $objectSupport, $objectForMap);
            if ('<<' === $key) {
              $this->refs[$refMatches['ref']] = $value;
              $data += $value;
            }
            elseif ($allowOverwrite || !isset($data[$key])) {

              // Spec: Keys MUST be unique; first one wins.
              // But overwriting is allowed when a merge node is used in current block.
              $data[$key] = $value;
            }
          }
        }
        else {
          $value = $this
            ->parseValue($values['value'], $exceptionOnInvalidType, $objectSupport, $objectForMap, $context);

          // Spec: Keys MUST be unique; first one wins.
          // But overwriting is allowed when a merge node is used in current block.
          if ($allowOverwrite || !isset($data[$key])) {
            $data[$key] = $value;
          }
        }
        if ($isRef) {
          $this->refs[$isRef] = $data[$key];
        }
      }
      else {

        // multiple documents are not supported
        if ('---' === $this->currentLine) {
          throw new ParseException('Multiple documents are not supported.', $this->currentLineNb + 1, $this->currentLine);
        }

        // 1-liner optionally followed by newline(s)
        if (is_string($value) && $this->lines[0] === trim($value)) {
          try {
            $value = Inline::parse($this->lines[0], $exceptionOnInvalidType, $objectSupport, $objectForMap, $this->refs);
          } catch (ParseException $e) {
            $e
              ->setParsedLine($this
              ->getRealCurrentLineNb() + 1);
            $e
              ->setSnippet($this->currentLine);
            throw $e;
          }
          return $value;
        }
        throw new ParseException('Unable to parse.', $this
          ->getRealCurrentLineNb() + 1, $this->currentLine);
      }
    }
    if ($objectForMap && !is_object($data) && 'mapping' === $context) {
      $object = new \stdClass();
      foreach ($data as $key => $value) {
        $object->{$key} = $value;
      }
      $data = $object;
    }
    return empty($data) ? null : $data;
  }
  private function parseBlock($offset, $yaml, $exceptionOnInvalidType, $objectSupport, $objectForMap) {
    $skippedLineNumbers = $this->skippedLineNumbers;
    foreach ($this->locallySkippedLineNumbers as $lineNumber) {
      if ($lineNumber < $offset) {
        continue;
      }
      $skippedLineNumbers[] = $lineNumber;
    }
    $parser = new self($offset, $this->totalNumberOfLines, $skippedLineNumbers);
    $parser->refs =& $this->refs;
    return $parser
      ->doParse($yaml, $exceptionOnInvalidType, $objectSupport, $objectForMap);
  }

  /**
   * Returns the current line number (takes the offset into account).
   *
   * @return int The current line number
   */
  private function getRealCurrentLineNb() {
    $realCurrentLineNumber = $this->currentLineNb + $this->offset;
    foreach ($this->skippedLineNumbers as $skippedLineNumber) {
      if ($skippedLineNumber > $realCurrentLineNumber) {
        break;
      }
      ++$realCurrentLineNumber;
    }
    return $realCurrentLineNumber;
  }

  /**
   * Returns the current line indentation.
   *
   * @return int The current line indentation
   */
  private function getCurrentLineIndentation() {
    return strlen($this->currentLine) - strlen(ltrim($this->currentLine, ' '));
  }

  /**
   * Returns the next embed block of YAML.
   *
   * @param int  $indentation The indent level at which the block is to be read, or null for default
   * @param bool $inSequence  True if the enclosing data structure is a sequence
   *
   * @return string A YAML string
   *
   * @throws ParseException When indentation problem are detected
   */
  private function getNextEmbedBlock($indentation = null, $inSequence = false) {
    $oldLineIndentation = $this
      ->getCurrentLineIndentation();
    $blockScalarIndentations = array();
    if ($this
      ->isBlockScalarHeader()) {
      $blockScalarIndentations[] = $this
        ->getCurrentLineIndentation();
    }
    if (!$this
      ->moveToNextLine()) {
      return;
    }
    if (null === $indentation) {
      $newIndent = $this
        ->getCurrentLineIndentation();
      $unindentedEmbedBlock = $this
        ->isStringUnIndentedCollectionItem();
      if (!$this
        ->isCurrentLineEmpty() && 0 === $newIndent && !$unindentedEmbedBlock) {
        throw new ParseException('Indentation problem.', $this
          ->getRealCurrentLineNb() + 1, $this->currentLine);
      }
    }
    else {
      $newIndent = $indentation;
    }
    $data = array();
    if ($this
      ->getCurrentLineIndentation() >= $newIndent) {
      $data[] = substr($this->currentLine, $newIndent);
    }
    else {
      $this
        ->moveToPreviousLine();
      return;
    }
    if ($inSequence && $oldLineIndentation === $newIndent && isset($data[0][0]) && '-' === $data[0][0]) {

      // the previous line contained a dash but no item content, this line is a sequence item with the same indentation
      // and therefore no nested list or mapping
      $this
        ->moveToPreviousLine();
      return;
    }
    $isItUnindentedCollection = $this
      ->isStringUnIndentedCollectionItem();
    if (empty($blockScalarIndentations) && $this
      ->isBlockScalarHeader()) {
      $blockScalarIndentations[] = $this
        ->getCurrentLineIndentation();
    }
    $previousLineIndentation = $this
      ->getCurrentLineIndentation();
    while ($this
      ->moveToNextLine()) {
      $indent = $this
        ->getCurrentLineIndentation();

      // terminate all block scalars that are more indented than the current line
      if (!empty($blockScalarIndentations) && $indent < $previousLineIndentation && '' !== trim($this->currentLine)) {
        foreach ($blockScalarIndentations as $key => $blockScalarIndentation) {
          if ($blockScalarIndentation >= $this
            ->getCurrentLineIndentation()) {
            unset($blockScalarIndentations[$key]);
          }
        }
      }
      if (empty($blockScalarIndentations) && !$this
        ->isCurrentLineComment() && $this
        ->isBlockScalarHeader()) {
        $blockScalarIndentations[] = $this
          ->getCurrentLineIndentation();
      }
      $previousLineIndentation = $indent;
      if ($isItUnindentedCollection && !$this
        ->isCurrentLineEmpty() && !$this
        ->isStringUnIndentedCollectionItem() && $newIndent === $indent) {
        $this
          ->moveToPreviousLine();
        break;
      }
      if ($this
        ->isCurrentLineBlank()) {
        $data[] = substr($this->currentLine, $newIndent);
        continue;
      }

      // we ignore "comment" lines only when we are not inside a scalar block
      if (empty($blockScalarIndentations) && $this
        ->isCurrentLineComment()) {

        // remember ignored comment lines (they are used later in nested
        // parser calls to determine real line numbers)
        //
        // CAUTION: beware to not populate the global property here as it
        // will otherwise influence the getRealCurrentLineNb() call here
        // for consecutive comment lines and subsequent embedded blocks
        $this->locallySkippedLineNumbers[] = $this
          ->getRealCurrentLineNb();
        continue;
      }
      if ($indent >= $newIndent) {
        $data[] = substr($this->currentLine, $newIndent);
      }
      elseif (0 == $indent) {
        $this
          ->moveToPreviousLine();
        break;
      }
      else {
        throw new ParseException('Indentation problem.', $this
          ->getRealCurrentLineNb() + 1, $this->currentLine);
      }
    }
    return implode("\n", $data);
  }

  /**
   * Moves the parser to the next line.
   *
   * @return bool
   */
  private function moveToNextLine() {
    if ($this->currentLineNb >= count($this->lines) - 1) {
      return false;
    }
    $this->currentLine = $this->lines[++$this->currentLineNb];
    return true;
  }

  /**
   * Moves the parser to the previous line.
   *
   * @return bool
   */
  private function moveToPreviousLine() {
    if ($this->currentLineNb < 1) {
      return false;
    }
    $this->currentLine = $this->lines[--$this->currentLineNb];
    return true;
  }

  /**
   * Parses a YAML value.
   *
   * @param string $value                  A YAML value
   * @param bool   $exceptionOnInvalidType True if an exception must be thrown on invalid types 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 string $context                The parser context (either sequence or mapping)
   *
   * @return mixed A PHP value
   *
   * @throws ParseException When reference does not exist
   */
  private function parseValue($value, $exceptionOnInvalidType, $objectSupport, $objectForMap, $context) {
    if (0 === strpos($value, '*')) {
      if (false !== ($pos = strpos($value, '#'))) {
        $value = substr($value, 1, $pos - 2);
      }
      else {
        $value = substr($value, 1);
      }
      if (!array_key_exists($value, $this->refs)) {
        throw new ParseException(sprintf('Reference "%s" does not exist.', $value), $this->currentLineNb + 1, $this->currentLine);
      }
      return $this->refs[$value];
    }
    if (self::preg_match('/^' . self::BLOCK_SCALAR_HEADER_PATTERN . '$/', $value, $matches)) {
      $modifiers = isset($matches['modifiers']) ? $matches['modifiers'] : '';
      return $this
        ->parseBlockScalar($matches['separator'], preg_replace('#\\d+#', '', $modifiers), (int) abs($modifiers));
    }
    try {
      $parsedValue = Inline::parse($value, $exceptionOnInvalidType, $objectSupport, $objectForMap, $this->refs);
      if ('mapping' === $context && '"' !== $value[0] && "'" !== $value[0] && '[' !== $value[0] && '{' !== $value[0] && '!' !== $value[0] && false !== strpos($parsedValue, ': ')) {
        @trigger_error(sprintf('Using a colon in the unquoted mapping value "%s" in line %d is deprecated since Symfony 2.8 and will throw a ParseException in 3.0.', $value, $this
          ->getRealCurrentLineNb() + 1), E_USER_DEPRECATED);

        // to be thrown in 3.0
        // throw new ParseException('A colon cannot be used in an unquoted mapping value.');
      }
      return $parsedValue;
    } catch (ParseException $e) {
      $e
        ->setParsedLine($this
        ->getRealCurrentLineNb() + 1);
      $e
        ->setSnippet($this->currentLine);
      throw $e;
    }
  }

  /**
   * Parses a block scalar.
   *
   * @param string $style       The style indicator that was used to begin this block scalar (| or >)
   * @param string $chomping    The chomping indicator that was used to begin this block scalar (+ or -)
   * @param int    $indentation The indentation indicator that was used to begin this block scalar
   *
   * @return string The text value
   */
  private function parseBlockScalar($style, $chomping = '', $indentation = 0) {
    $notEOF = $this
      ->moveToNextLine();
    if (!$notEOF) {
      return '';
    }
    $isCurrentLineBlank = $this
      ->isCurrentLineBlank();
    $blockLines = array();

    // leading blank lines are consumed before determining indentation
    while ($notEOF && $isCurrentLineBlank) {

      // newline only if not EOF
      if ($notEOF = $this
        ->moveToNextLine()) {
        $blockLines[] = '';
        $isCurrentLineBlank = $this
          ->isCurrentLineBlank();
      }
    }

    // determine indentation if not specified
    if (0 === $indentation) {
      if (self::preg_match('/^ +/', $this->currentLine, $matches)) {
        $indentation = strlen($matches[0]);
      }
    }
    if ($indentation > 0) {
      $pattern = sprintf('/^ {%d}(.*)$/', $indentation);
      while ($notEOF && ($isCurrentLineBlank || self::preg_match($pattern, $this->currentLine, $matches))) {
        if ($isCurrentLineBlank && strlen($this->currentLine) > $indentation) {
          $blockLines[] = substr($this->currentLine, $indentation);
        }
        elseif ($isCurrentLineBlank) {
          $blockLines[] = '';
        }
        else {
          $blockLines[] = $matches[1];
        }

        // newline only if not EOF
        if ($notEOF = $this
          ->moveToNextLine()) {
          $isCurrentLineBlank = $this
            ->isCurrentLineBlank();
        }
      }
    }
    elseif ($notEOF) {
      $blockLines[] = '';
    }
    if ($notEOF) {
      $blockLines[] = '';
      $this
        ->moveToPreviousLine();
    }
    elseif (!$notEOF && !$this
      ->isCurrentLineLastLineInDocument()) {
      $blockLines[] = '';
    }

    // folded style
    if ('>' === $style) {
      $text = '';
      $previousLineIndented = false;
      $previousLineBlank = false;
      for ($i = 0, $blockLinesCount = count($blockLines); $i < $blockLinesCount; ++$i) {
        if ('' === $blockLines[$i]) {
          $text .= "\n";
          $previousLineIndented = false;
          $previousLineBlank = true;
        }
        elseif (' ' === $blockLines[$i][0]) {
          $text .= "\n" . $blockLines[$i];
          $previousLineIndented = true;
          $previousLineBlank = false;
        }
        elseif ($previousLineIndented) {
          $text .= "\n" . $blockLines[$i];
          $previousLineIndented = false;
          $previousLineBlank = false;
        }
        elseif ($previousLineBlank || 0 === $i) {
          $text .= $blockLines[$i];
          $previousLineIndented = false;
          $previousLineBlank = false;
        }
        else {
          $text .= ' ' . $blockLines[$i];
          $previousLineIndented = false;
          $previousLineBlank = false;
        }
      }
    }
    else {
      $text = implode("\n", $blockLines);
    }

    // deal with trailing newlines
    if ('' === $chomping) {
      $text = preg_replace('/\\n+$/', "\n", $text);
    }
    elseif ('-' === $chomping) {
      $text = preg_replace('/\\n+$/', '', $text);
    }
    return $text;
  }

  /**
   * Returns true if the next line is indented.
   *
   * @return bool Returns true if the next line is indented, false otherwise
   */
  private function isNextLineIndented() {
    $currentIndentation = $this
      ->getCurrentLineIndentation();
    $EOF = !$this
      ->moveToNextLine();
    while (!$EOF && $this
      ->isCurrentLineEmpty()) {
      $EOF = !$this
        ->moveToNextLine();
    }
    if ($EOF) {
      return false;
    }
    $ret = $this
      ->getCurrentLineIndentation() > $currentIndentation;
    $this
      ->moveToPreviousLine();
    return $ret;
  }

  /**
   * Returns true if the current line is blank or if it is a comment line.
   *
   * @return bool Returns true if the current line is empty or if it is a comment line, false otherwise
   */
  private function isCurrentLineEmpty() {
    return $this
      ->isCurrentLineBlank() || $this
      ->isCurrentLineComment();
  }

  /**
   * Returns true if the current line is blank.
   *
   * @return bool Returns true if the current line is blank, false otherwise
   */
  private function isCurrentLineBlank() {
    return '' == trim($this->currentLine, ' ');
  }

  /**
   * Returns true if the current line is a comment line.
   *
   * @return bool Returns true if the current line is a comment line, false otherwise
   */
  private function isCurrentLineComment() {

    //checking explicitly the first char of the trim is faster than loops or strpos
    $ltrimmedLine = ltrim($this->currentLine, ' ');
    return '' !== $ltrimmedLine && '#' === $ltrimmedLine[0];
  }
  private function isCurrentLineLastLineInDocument() {
    return $this->offset + $this->currentLineNb >= $this->totalNumberOfLines - 1;
  }

  /**
   * Cleanups a YAML string to be parsed.
   *
   * @param string $value The input YAML string
   *
   * @return string A cleaned up YAML string
   */
  private function cleanup($value) {
    $value = str_replace(array(
      "\r\n",
      "\r",
    ), "\n", $value);

    // strip YAML header
    $count = 0;
    $value = preg_replace('#^\\%YAML[: ][\\d\\.]+.*\\n#u', '', $value, -1, $count);
    $this->offset += $count;

    // remove leading comments
    $trimmedValue = preg_replace('#^(\\#.*?\\n)+#s', '', $value, -1, $count);
    if (1 == $count) {

      // items have been removed, update the offset
      $this->offset += substr_count($value, "\n") - substr_count($trimmedValue, "\n");
      $value = $trimmedValue;
    }

    // remove start of the document marker (---)
    $trimmedValue = preg_replace('#^\\-\\-\\-.*?\\n#s', '', $value, -1, $count);
    if (1 == $count) {

      // items have been removed, update the offset
      $this->offset += substr_count($value, "\n") - substr_count($trimmedValue, "\n");
      $value = $trimmedValue;

      // remove end of the document marker (...)
      $value = preg_replace('#\\.\\.\\.\\s*$#', '', $value);
    }
    return $value;
  }

  /**
   * Returns true if the next line starts unindented collection.
   *
   * @return bool Returns true if the next line starts unindented collection, false otherwise
   */
  private function isNextLineUnIndentedCollection() {
    $currentIndentation = $this
      ->getCurrentLineIndentation();
    $notEOF = $this
      ->moveToNextLine();
    while ($notEOF && $this
      ->isCurrentLineEmpty()) {
      $notEOF = $this
        ->moveToNextLine();
    }
    if (false === $notEOF) {
      return false;
    }
    $ret = $this
      ->getCurrentLineIndentation() === $currentIndentation && $this
      ->isStringUnIndentedCollectionItem();
    $this
      ->moveToPreviousLine();
    return $ret;
  }

  /**
   * Returns true if the string is un-indented collection item.
   *
   * @return bool Returns true if the string is un-indented collection item, false otherwise
   */
  private function isStringUnIndentedCollectionItem() {
    return '-' === rtrim($this->currentLine) || 0 === strpos($this->currentLine, '- ');
  }

  /**
   * Tests whether or not the current line is the header of a block scalar.
   *
   * @return bool
   */
  private function isBlockScalarHeader() {
    return (bool) self::preg_match('~' . self::BLOCK_SCALAR_HEADER_PATTERN . '$~', $this->currentLine);
  }

  /**
   * A local wrapper for `preg_match` which will throw a ParseException if there
   * is an internal error in the PCRE engine.
   *
   * This avoids us needing to check for "false" every time PCRE is used
   * in the YAML engine
   *
   * @throws ParseException on a PCRE internal error
   *
   * @see preg_last_error()
   *
   * @internal
   */
  public static function preg_match($pattern, $subject, &$matches = null, $flags = 0, $offset = 0) {
    if (false === ($ret = preg_match($pattern, $subject, $matches, $flags, $offset))) {
      switch (preg_last_error()) {
        case PREG_INTERNAL_ERROR:
          $error = 'Internal PCRE error.';
          break;
        case PREG_BACKTRACK_LIMIT_ERROR:
          $error = 'pcre.backtrack_limit reached.';
          break;
        case PREG_RECURSION_LIMIT_ERROR:
          $error = 'pcre.recursion_limit reached.';
          break;
        case PREG_BAD_UTF8_ERROR:
          $error = 'Malformed UTF-8 data.';
          break;
        case PREG_BAD_UTF8_OFFSET_ERROR:
          $error = 'Offset doesn\'t correspond to the begin of a valid UTF-8 code point.';
          break;
        default:
          $error = 'Error.';
      }
      throw new ParseException($error);
    }
    return $ret;
  }

}
Classes

Name	Description
Parser	Parser parses YAML strings to convert them to PHP arrays.
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Parser.php in Loft Data Grids 7.2

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