class TokenParser

StaticReflectionParser.php in drupal/core/vendor/doctrine/common/lib/Doctrine/Common/Reflection/StaticReflectionParser.php

class TokenParser {

  /**
   * The token list.
   *
   * @var array
   */
  private $tokens;

  /**
   * The number of tokens.
   *
   * @var int
   */
  private $numTokens = 0;

  /**
   * The current array pointer.
   *
   * @var int
   */
  private $pointer = 0;
  public function __construct($contents) {
    $this->tokens = token_get_all($contents);
    $this->numTokens = count($this->tokens);
    $this->pointer = 0;
  }

  /**
   * Gets the next non whitespace and non comment token.
   *
   * @param $docCommentIsComment
   *     If TRUE then a doc comment is considered a comment and skipped.
   *     If FALSE then only whitespace and normal comments are skipped.
   *
   * @return array The token if exists, null otherwise.
   */
  public function next($docCommentIsComment = TRUE) {
    for ($i = $this->pointer; $i < $this->numTokens; $i++) {
      $this->pointer++;
      if ($this->tokens[$i][0] === T_WHITESPACE || $this->tokens[$i][0] === T_COMMENT || $docCommentIsComment && $this->tokens[$i][0] === T_DOC_COMMENT) {
        continue;
      }
      return $this->tokens[$i];
    }
    return null;
  }

  /**
   * Parse a single use statement.
   *
   * @return array A list with all found class names for a use statement.
   */
  public function parseUseStatement() {
    $class = '';
    $alias = '';
    $statements = array();
    $explicitAlias = false;
    while ($token = $this
      ->next()) {
      $isNameToken = $token[0] === T_STRING || $token[0] === T_NS_SEPARATOR;
      if (!$explicitAlias && $isNameToken) {
        $class .= $token[1];
        $alias = $token[1];
      }
      else {
        if ($explicitAlias && $isNameToken) {
          $alias .= $token[1];
        }
        else {
          if ($token[0] === T_AS) {
            $explicitAlias = true;
            $alias = '';
          }
          else {
            if ($token === ',') {
              $statements[strtolower($alias)] = $class;
              $class = '';
              $alias = '';
              $explicitAlias = false;
            }
            else {
              if ($token === ';') {
                $statements[strtolower($alias)] = $class;
                break;
              }
              else {
                break;
              }
            }
          }
        }
      }
    }
    return $statements;
  }

  /**
   * Get all use statements.
   *
   * @param string $namespaceName The namespace name of the reflected class.
   * @return array A list with all found use statements.
   */
  public function parseUseStatements($namespaceName) {
    $statements = array();
    while ($token = $this
      ->next()) {
      if ($token[0] === T_USE) {
        $statements = array_merge($statements, $this
          ->parseUseStatement());
        continue;
      }
      if ($token[0] !== T_NAMESPACE || $this
        ->parseNamespace() != $namespaceName) {
        continue;
      }

      // Get fresh array for new namespace. This is to prevent the parser to collect the use statements
      // for a previous namespace with the same name. This is the case if a namespace is defined twice
      // or if a namespace with the same name is commented out.
      $statements = array();
    }
    return $statements;
  }

  /**
   * Get the namespace.
   *
   * @return string The found namespace.
   */
  public function parseNamespace() {
    $name = '';
    while (($token = $this
      ->next()) && ($token[0] === T_STRING || $token[0] === T_NS_SEPARATOR)) {
      $name .= $token[1];
    }
    return $name;
  }

  /**
   * Get the class name.
   *
   * @return string The foundclass name.
   */
  public function parseClass() {

    // Namespaces and class names are tokenized the same: T_STRINGs
    // separated by T_NS_SEPARATOR so we can use one function to provide
    // both.
    return $this
      ->parseNamespace();
  }

}