includes/wikiformat.php
author Dan
Fri, 21 Aug 2009 13:48:48 -0400
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Copyright (C) 2006-2009 Dan Fuhry
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * Framework for parsing and rendering various formats. In Enano by default, this is MediaWiki-style wikitext being
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 * rendered to XHTML, but this framework allows other formats to be supported as well.
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 *
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 * @package Enano
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 * @subpackage Content
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 * @author Dan Fuhry <dan@enanocms.org>
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 * @copyright (C) 2009 Enano CMS Project
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 * @license GNU General Public License, version 2 or later <http://www.gnu.org/licenses/gpl-2.0.html>
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 */
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class Carpenter
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{
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  /**
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   * Parser token
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   * @const string
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   */
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  const PARSER_TOKEN = "\xFF";
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  /**
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   * Parsing engine
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   * @var string
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   */
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  private $parser = 'mediawiki';
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  /**
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   * Rendering engine
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   * @var string
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   */
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  private $renderer = 'xhtml';
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  /**
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   * Rendering flags
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   */
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  public $flags = RENDER_WIKI_DEFAULT;
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  /**
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   * List of rendering rules
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   * @var array
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   */
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  private $rules = array(
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      'lang',
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      'templates',
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      'blockquote',
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      'tables',
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      'heading',
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      // note: can't be named list ("list" is a PHP language construct)
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      'multilist',
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      'bold',
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      'italic',
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      'underline',
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      'externalwithtext',
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      'externalnotext',
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      'image',
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      'internallink',
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      'paragraph',
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      'blockquotepost'
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    );
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  /**
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   * List of render hooks
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   * @var array
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   */
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  private $hooks = array();
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  /* private $rules = array('prefilter', 'delimiter', 'code', 'function', 'html', 'raw', 'include', 'embed', 'anchor',
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           'heading', 'toc', 'horiz', 'break', 'blockquote', 'list', 'deflist', 'table', 'image',
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           'phplookup', 'center', 'newline', 'paragraph', 'url', 'freelink', 'interwiki',
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           'wikilink', 'colortext', 'strong', 'bold', 'emphasis', 'italic', 'underline', 'tt',
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           'superscript', 'subscript', 'revise', 'tighten'); */
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  /**
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   * Render the text!
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   * @param string Text to render
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   * @return string
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   */
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  public function render($text)
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  {
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    $parser_class = "Carpenter_Parse_" . ucwords($this->parser);
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    $renderer_class = "Carpenter_Render_" . ucwords($this->renderer);
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    // include files, if we haven't already
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    if ( !class_exists($parser_class) )
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    {
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      require_once( ENANO_ROOT . "/includes/wikiengine/parse_{$this->parser}.php");
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    }
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    if ( !class_exists($renderer_class) )
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    {
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      require_once( ENANO_ROOT . "/includes/wikiengine/render_{$this->renderer}.php");
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    }
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    $parser = new $parser_class;
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    $renderer = new $renderer_class;
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    // run prehooks
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    foreach ( $this->hooks as $hook )
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    {
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      if ( $hook['when'] === PO_FIRST )
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      {
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        $text = call_user_func($hook['callback'], $text);
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        if ( !is_string($text) || empty($text) )
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        {
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          trigger_error("Hook returned empty/invalid text: " . print_r($hook['callback'], true), E_USER_WARNING);
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          // *sigh*
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          $text = '';
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        }
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      }
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    }
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    // perform render
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    foreach ( $this->rules as $rule )
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    {
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      // run prehooks
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      foreach ( $this->hooks as $hook )
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      {
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        if ( $hook['when'] === PO_BEFORE && $hook['rule'] === $rule )
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        {
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          $text = call_user_func($hook['callback'], $text);
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          if ( !is_string($text) || empty($text) )
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          {
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            trigger_error("Hook returned empty/invalid text: " . print_r($hook['callback'], true), E_USER_WARNING);
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            // *sigh*
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            $text = '';
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          }
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        }
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      }
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      // execute rule
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      $text = $this->perform_render_step($text, $rule, $parser, $renderer);
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      // run posthooks
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      foreach ( $this->hooks as $hook )
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      {
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        if ( $hook['when'] === PO_AFTER && $hook['rule'] === $rule )
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        {
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          $text = call_user_func($hook['callback'], $text);
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          if ( !is_string($text) || empty($text) )
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          {
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            trigger_error("Hook returned empty/invalid text: " . print_r($hook['callback'], true), E_USER_WARNING);
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            // *sigh*
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            $text = '';
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          }
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        }
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      }
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    }
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    // run posthooks
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    foreach ( $this->hooks as $hook )
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    {
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      if ( $hook['when'] === PO_LAST )
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      {
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        $text = call_user_func($hook['callback'], $text);
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        if ( !is_string($text) || empty($text) )
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        {
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          trigger_error("Hook returned empty/invalid text: " . print_r($hook['callback'], true), E_USER_WARNING);
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          // *sigh*
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          $text = '';
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        }
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      }
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    }
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    return (( defined('ENANO_DEBUG') && isset($_GET['parserdebug']) ) ? '<pre>' . htmlspecialchars($text) . '</pre>' : $text) . "\n\n";
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  }
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  /**
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   * Performs a step in the rendering process.
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   * @param string Text to render
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   * @param string Rule to execute
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   * @param object Parser instance
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   * @param object Renderer instance
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   * @return string
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   * @access private
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   */
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  private function perform_render_step($text, $rule, $parser, $renderer)
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  {
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    // First look for a direct function
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    if ( function_exists("parser_{$this->parser}_{$this->renderer}_{$rule}") )
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    {
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      return call_user_func("parser_{$this->parser}_{$this->renderer}_{$rule}", $text, $this->flags);
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    }
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    // We don't have that, so start looking for other ways or means of doing this
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    if ( method_exists($parser, $rule) && method_exists($renderer, $rule) )
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    {
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      // Both the parser and render have callbacks they want to use.
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      $pieces = $parser->$rule($text);
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      $text = call_user_func(array($renderer, $rule), $text, $pieces);
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    }
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    else if ( method_exists($parser, $rule) && !method_exists($renderer, $rule) && isset($renderer->rules[$rule]) )
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    {
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      // The parser has a callback, but the renderer does not
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      $pieces = $parser->$rule($text);
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      $text = $this->generic_render($text, $pieces, $renderer->rules[$rule]);
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    }
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    else if ( !method_exists($parser, $rule) && isset($parser->rules[$rule]) && method_exists($renderer, $rule) )
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    {
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      // The parser has no callback, but the renderer does
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      $text = preg_replace_callback($parser->rules[$rule], array($renderer, $rule), $text);
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    }
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    else if ( isset($parser->rules[$rule]) && isset($renderer->rules[$rule]) )
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    {
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      // This is a straight-up regex only rule
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      $text = preg_replace($parser->rules[$rule], $renderer->rules[$rule], $text);
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    }
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    else
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    {
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      // Either the renderer or parser does not support this rule, ignore it
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    }
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    return $text;
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  }
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  /**
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   * Generic renderer
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   * @access protected
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   */
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  protected function generic_render($text, $pieces, $rule)
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  {
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    foreach ( $pieces as $i => $piece )
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    {
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      $replacement = $rule;
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      // if the piece is an array, replace $1, $2, etc. in the rule with each value in the piece
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      if ( is_array($piece) )
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      {
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        $j = 0;
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        foreach ( $piece as $part )
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        {
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          $j++;
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          $replacement = str_replace(array("\\$j", "\${$j}"), $part, $replacement);
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        }
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      }
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      // else, just replace \\1 or $1 in the rule with the piece
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      else
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      {
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        $replacement = str_replace(array("\\1", "\$1"), $piece, $replacement);
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      }
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      $text = str_replace(self::generate_token($i), $replacement, $text);
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    }
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    return $text;
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  }
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  /**
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   * Add a hook into the parser.
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   * @param callback Function to call
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   * @param int PO_* constant
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   * @param string If PO_{BEFORE,AFTER} used, rule
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   */
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  public function hook($callback, $when, $rule = false)
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  {
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    if ( !is_int($when) )
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      return null;
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    if ( ($when == PO_BEFORE || $when == PO_AFTER) && !is_string($rule) )
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      return null;
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    if ( ( is_string($callback) && !function_exists($callback) ) || ( is_array($callback) && !method_exists($callback[0], $callback[1]) ) || ( !is_string($callback) && !is_array($callback) ) )
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    {
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      trigger_error("Attempt to hook with undefined function/method " . print_r($callback, true), E_USER_ERROR);
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      return null;
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    }
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    $this->hooks[] = array(
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        'callback' => $callback,
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        'when'     => $when,
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        'rule'     => $rule
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      );
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  }
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  /**
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   * Disable a render stage
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   * @param string stage
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   * @return null
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   */
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  public function disable_rule($rule)
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  {
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    foreach ( $this->rules as $i => $current_rule )
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    {
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      if ( $current_rule === $rule )
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      {
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        unset($this->rules[$i]);
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        return null;
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      }
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    }
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    return null;
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  }
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  /**
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   * Make a rule exclusive (the only one called)
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   * @param string stage
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   * @return null
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   */
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  public function exclusive_rule($rule)
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  {
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    if ( is_string($rule) )
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      $this->rules = array($rule);
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    return null;
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  }
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  /**
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   * Generate a token
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   * @param int Token index
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   * @return string
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   * @static
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   */
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  public static function generate_token($i)
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  {
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    return self::PARSER_TOKEN . $i . self::PARSER_TOKEN;
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  }
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  /**
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   * Tokenize string
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   * @param string
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   * @param array Matches
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   * @return string
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   * @static
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   */
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  public static function tokenize($text, $matches)
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  {
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    $matches = array_values($matches);
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    foreach ( $matches as $i => $match )
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    {
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      $text = str_replace_once($match, self::generate_token($i), $text);
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    }
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    return $text;
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  }
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}
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