trekel / src / plex / Trekel / Lexer.plex

<?php

/**
 * Copyright 2010 Joey Mazzarelli. All rights reserved.
 *
 * Redistribution and use in source, with or without modification, is
 * permitted provided that the following condition is met:
 *
 *    1. Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 * THIS SOFTWARE IS PROVIDED BY JOEY MAZZARELLI ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL JOEY MAZZARELLI OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation
 * are those of the authors and should not be interpreted as representing
 * official policies, either expressed or implied, of Joey Mazzarelli.
 */

require_once 'Trekel/Parser.php';

class Trekel_Lexer {

  private $input;
  private $N;
  public $token;
  public $value;
  public $line;
  private $val_width = 0;
  public $column;
  private $_string;
  private $debug = 0;

  private function updateColumn ($val = null) {
    if (null == $val) {
      $val = $this->value;
    }
    if ("\n" == $val) {
      $this->val_width = 0;
      $this->column = 1;
    } else {
      $this->column += $this->val_width;
      $this->val_width = strlen($val);
    }
  }

  function __construct ($data) {
    $this->input = str_replace("\r", "\n", str_replace("\r\n", "\n", $data));
    $this->N = 0;
  }

/*!lex2php
%input $this->input
%counter $this->N
%token $this->token
%value $this->value
%line $this->line
%matchlongest true

// Regular expression tokens

GETTER = /[a-zA-Z][a-zA-Z0-9_]*\(\)/
IDENTIFIER = /[a-zA-Z][a-zA-Z0-9_]*/
DQUOTESTRING = /"([^"]|(\\"))*"/
PSEUDO = /:[a-zA-Z][a-zA-Z0-9_-]*/
SQUOTESTRING = /'([^']|(''))*'/
WHITESPACE = /\s+/

*/

/*!lex2php
'*' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_IDENTIFIER;
}

'[' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_LBRACKET;
}

']' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_RBRACKET;
}

'=' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_EQ;
}

'^=' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_STARTSWITH;
}

'$=' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_ENDSWITH;
}

'*=' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_CONTAINS;
}

'!=' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_NEQ;
}

'>' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_CHILD;
}

'+' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_ADJACENT;
}

'~' {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_SIBLING;
}

// Regular expression tokens

GETTER {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_GETTER;
}

IDENTIFIER {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_IDENTIFIER;
}

PSEUDO {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_PSEUDO;
}

DQUOTESTRING {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_STRING;
}

SQUOTESTRING {
  $this->updateColumn();
  $this->token = Trekel_Parser::T_STRING;
}

WHITESPACE {
  $this->updateColumn();
  return false;
}

*/

  /**
   * return something useful, when a parse error occurs.
   *
   * used to build error messages if the parser fails, and needs to
   * know the line number..
   *
   * @return   string
   * @access   public
   */
  function parseError () {
    return "Error at line {$this->yyline}";
  }

} // end Trekel_Lexer

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