author | Dan |
Fri, 18 Dec 2009 09:39:18 -0500 | |
changeset 1174 | def792dd9b1b |
parent 1156 | 417e66a664d0 |
child 1217 | feeb49aa6270 |
permissions | -rw-r--r-- |
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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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/** |
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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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'code', |
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'tables', |
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'heading', |
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'hr', |
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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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'mailtowithtext', |
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'mailtonotext', |
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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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// empty? |
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if ( trim($text) === '' ) |
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return $text; |
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// include files, if we haven't already |
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if ( !class_exists($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($text) ) |
438 | 149 |
{ |
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trigger_error("Hook returned empty/invalid text: " . print_r($hook['callback'], true), E_USER_WARNING); |
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// *sigh* |
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$text = ''; |
438 | 153 |
} |
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} |
1 | 155 |
} |
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|
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// execute rule |
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$text_before = $text; |
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$text = $this->perform_render_step($text, $rule, $parser, $renderer); |
1127
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if ( empty($text) ) |
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{ |
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trigger_error("Wikitext was empty after rule \"$rule\"; restoring backup", E_USER_WARNING); |
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$text = $text_before; |
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} |
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unset($text_before); |
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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_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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176 |
// *sigh* |
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$text = ''; |
1 | 178 |
} |
179 |
} |
|
180 |
} |
|
181 |
} |
|
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|
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// run posthooks |
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foreach ( $this->hooks as $hook ) |
1 | 185 |
{ |
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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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192 |
// *sigh* |
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193 |
$text = ''; |
1 | 194 |
} |
195 |
} |
|
196 |
} |
|
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|
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return (( defined('ENANO_DEBUG') && isset($_GET['parserdebug']) ) ? '<pre>' . htmlspecialchars($text) . '</pre>' : $text) . "\n\n"; |
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} |
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|
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201 |
/** |
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* Performs a step in the rendering process. |
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* @param string Text to render |
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* @param string Rule to execute |
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* @param object Parser instance |
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* @param object Renderer instance |
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* @return string |
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* @access private |
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209 |
*/ |
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210 |
|
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211 |
private function perform_render_step($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}") ) |
1 | 215 |
{ |
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return call_user_func("parser_{$this->parser}_{$this->renderer}_{$rule}", $text, $this->flags); |
1 | 217 |
} |
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|
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219 |
// We don't have that, so start looking for other ways or means of doing this |
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if ( method_exists($parser, $rule) && method_exists($renderer, $rule) ) |
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221 |
{ |
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// Both the parser and render have callbacks they want to use. |
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223 |
$pieces = $parser->$rule($text); |
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224 |
$text = call_user_func(array($renderer, $rule), $text, $pieces); |
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225 |
} |
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226 |
else if ( method_exists($parser, $rule) && !method_exists($renderer, $rule) && isset($renderer->rules[$rule]) ) |
1 | 227 |
{ |
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228 |
// The parser has a callback, but the renderer does not |
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229 |
$pieces = $parser->$rule($text); |
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230 |
$text = $this->generic_render($text, $pieces, $renderer->rules[$rule]); |
1 | 231 |
} |
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232 |
else if ( !method_exists($parser, $rule) && isset($parser->rules[$rule]) && method_exists($renderer, $rule) ) |
1 | 233 |
{ |
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234 |
// The parser has no callback, but the renderer does |
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235 |
$text = preg_replace_callback($parser->rules[$rule], array($renderer, $rule), $text); |
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236 |
} |
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237 |
else if ( isset($parser->rules[$rule]) && isset($renderer->rules[$rule]) ) |
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238 |
{ |
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239 |
// This is a straight-up regex only rule |
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240 |
$text = preg_replace($parser->rules[$rule], $renderer->rules[$rule], $text); |
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241 |
} |
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242 |
else |
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|
243 |
{ |
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244 |
// Either the renderer or parser does not support this rule, ignore it |
1 | 245 |
} |
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246 |
|
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247 |
return $text; |
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248 |
} |
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249 |
|
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250 |
/** |
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251 |
* Generic renderer |
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252 |
* @access protected |
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253 |
*/ |
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254 |
|
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255 |
protected function generic_render($text, $pieces, $rule) |
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256 |
{ |
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|
257 |
foreach ( $pieces as $i => $piece ) |
1 | 258 |
{ |
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259 |
$replacement = $rule; |
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260 |
|
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261 |
// if the piece is an array, replace $1, $2, etc. in the rule with each value in the piece |
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|
262 |
if ( is_array($piece) ) |
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|
263 |
{ |
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|
264 |
$j = 0; |
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|
265 |
foreach ( $piece as $part ) |
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266 |
{ |
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267 |
$j++; |
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268 |
$replacement = str_replace(array("\\$j", "\${$j}"), $part, $replacement); |
1 | 269 |
} |
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270 |
} |
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271 |
// else, just replace \\1 or $1 in the rule with the piece |
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else |
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273 |
{ |
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274 |
$replacement = str_replace(array("\\1", "\$1"), $piece, $replacement); |
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275 |
} |
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276 |
|
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277 |
$text = str_replace(self::generate_token($i), $replacement, $text); |
1 | 278 |
} |
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|
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return $text; |
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} |
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|
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/** |
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* Add a hook into the parser. |
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* @param callback Function to call |
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* @param int PO_* constant |
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* @param string If PO_{BEFORE,AFTER} used, rule |
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*/ |
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|
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public function hook($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($callback) ) ) |
1 | 297 |
{ |
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trigger_error("Attempt to hook with undefined function/method " . print_r($callback, true), E_USER_ERROR); |
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return null; |
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} |
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|
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$this->hooks[] = array( |
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'callback' => $callback, |
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'when' => $when, |
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'rule' => $rule |
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); |
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} |
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|
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/** |
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* Disable a render stage |
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* @param string stage |
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* @return null |
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*/ |
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|
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public function disable_rule($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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/** |
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329 |
* Disables all rules. |
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330 |
* @return null |
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331 |
*/ |
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|
332 |
|
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333 |
public function disable_all_rules() |
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334 |
{ |
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|
335 |
$this->rules = array(); |
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336 |
return null; |
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337 |
} |
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|
338 |
|
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339 |
/** |
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340 |
* Enables a rule |
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341 |
* @param string rule |
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342 |
* @return null |
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343 |
*/ |
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344 |
|
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345 |
public function enable_rule($rule) |
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346 |
{ |
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347 |
$this->rules[] = $rule; |
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348 |
return null; |
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349 |
} |
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350 |
|
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|
351 |
/** |
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352 |
* Make a rule exclusive (the only one called) |
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353 |
* @param string stage |
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* @return null |
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355 |
*/ |
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356 |
|
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357 |
public function exclusive_rule($rule) |
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{ |
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359 |
if ( is_string($rule) ) |
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360 |
$this->rules = array($rule); |
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|
361 |
|
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362 |
return null; |
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363 |
} |
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|
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|
365 |
/** |
1027
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|
366 |
* Generate a token |
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367 |
* @param int Token index |
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368 |
* @return string |
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|
369 |
* @static |
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370 |
*/ |
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371 |
|
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372 |
public static function generate_token($i) |
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373 |
{ |
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374 |
return self::PARSER_TOKEN . $i . self::PARSER_TOKEN; |
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375 |
} |
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376 |
|
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|
377 |
/** |
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|
378 |
* Tokenize string |
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|
379 |
* @param string |
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|
380 |
* @param array Matches |
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|
381 |
* @return string |
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|
382 |
* @static |
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|
383 |
*/ |
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|
384 |
|
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|
385 |
public static function tokenize($text, $matches) |
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386 |
{ |
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|
387 |
$matches = array_values($matches); |
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|
388 |
foreach ( $matches as $i => $match ) |
1 | 389 |
{ |
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|
390 |
$text = str_replace_once($match, self::generate_token($i), $text); |
1 | 391 |
} |
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|
392 |
|
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|
393 |
return $text; |
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|
394 |
} |
1 | 395 |
} |
396 |