228 lines
7.1 KiB
PHP
228 lines
7.1 KiB
PHP
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<?php
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/**
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* Abstract class for a set of proprietary modules that clean up (tidy)
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* poorly written HTML.
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* @todo Figure out how to protect some of these methods/properties
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*/
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class HTMLPurifier_HTMLModule_Tidy extends HTMLPurifier_HTMLModule
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{
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/**
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* List of supported levels.
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* Index zero is a special case "no fixes" level.
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* @type array
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*/
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public $levels = array(0 => 'none', 'light', 'medium', 'heavy');
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/**
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* Default level to place all fixes in.
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* Disabled by default.
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* @type string
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*/
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public $defaultLevel = null;
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/**
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* Lists of fixes used by getFixesForLevel().
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* Format is:
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* HTMLModule_Tidy->fixesForLevel[$level] = array('fix-1', 'fix-2');
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* @type array
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*/
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public $fixesForLevel = array(
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'light' => array(),
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'medium' => array(),
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'heavy' => array()
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);
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/**
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* Lazy load constructs the module by determining the necessary
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* fixes to create and then delegating to the populate() function.
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* @param HTMLPurifier_Config $config
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* @todo Wildcard matching and error reporting when an added or
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* subtracted fix has no effect.
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*/
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public function setup($config)
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{
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// create fixes, initialize fixesForLevel
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$fixes = $this->makeFixes();
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$this->makeFixesForLevel($fixes);
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// figure out which fixes to use
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$level = $config->get('HTML.TidyLevel');
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$fixes_lookup = $this->getFixesForLevel($level);
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// get custom fix declarations: these need namespace processing
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$add_fixes = $config->get('HTML.TidyAdd');
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$remove_fixes = $config->get('HTML.TidyRemove');
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foreach ($fixes as $name => $fix) {
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// needs to be refactored a little to implement globbing
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if (isset($remove_fixes[$name]) ||
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(!isset($add_fixes[$name]) && !isset($fixes_lookup[$name]))) {
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unset($fixes[$name]);
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}
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}
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// populate this module with necessary fixes
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$this->populate($fixes);
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}
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/**
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* Retrieves all fixes per a level, returning fixes for that specific
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* level as well as all levels below it.
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* @param string $level level identifier, see $levels for valid values
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* @return array Lookup up table of fixes
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*/
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public function getFixesForLevel($level)
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{
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if ($level == $this->levels[0]) {
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return array();
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}
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$activated_levels = array();
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for ($i = 1, $c = count($this->levels); $i < $c; $i++) {
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$activated_levels[] = $this->levels[$i];
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if ($this->levels[$i] == $level) {
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break;
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}
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}
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if ($i == $c) {
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trigger_error(
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'Tidy level ' . htmlspecialchars($level) . ' not recognized',
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E_USER_WARNING
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);
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return array();
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}
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$ret = array();
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foreach ($activated_levels as $level) {
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foreach ($this->fixesForLevel[$level] as $fix) {
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$ret[$fix] = true;
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}
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}
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return $ret;
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}
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/**
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* Dynamically populates the $fixesForLevel member variable using
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* the fixes array. It may be custom overloaded, used in conjunction
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* with $defaultLevel, or not used at all.
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* @param array $fixes
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*/
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public function makeFixesForLevel($fixes)
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{
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if (!isset($this->defaultLevel)) {
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return;
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}
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if (!isset($this->fixesForLevel[$this->defaultLevel])) {
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trigger_error(
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'Default level ' . $this->defaultLevel . ' does not exist',
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E_USER_ERROR
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);
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return;
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}
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$this->fixesForLevel[$this->defaultLevel] = array_keys($fixes);
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}
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/**
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* Populates the module with transforms and other special-case code
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* based on a list of fixes passed to it
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* @param array $fixes Lookup table of fixes to activate
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*/
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public function populate($fixes)
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{
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foreach ($fixes as $name => $fix) {
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// determine what the fix is for
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list($type, $params) = $this->getFixType($name);
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switch ($type) {
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case 'attr_transform_pre':
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case 'attr_transform_post':
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$attr = $params['attr'];
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if (isset($params['element'])) {
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$element = $params['element'];
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if (empty($this->info[$element])) {
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$e = $this->addBlankElement($element);
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} else {
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$e = $this->info[$element];
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}
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} else {
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$type = "info_$type";
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$e = $this;
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}
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$e->{$type}[$attr] = $fix;
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break;
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case 'tag_transform':
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$this->info_tag_transform[$params['element']] = $fix;
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break;
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case 'child':
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case 'content_model_type':
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$element = $params['element'];
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if (empty($this->info[$element])) {
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$e = $this->addBlankElement($element);
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} else {
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$e = $this->info[$element];
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}
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$e->$type = $fix;
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break;
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default:
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trigger_error("Fix type $type not supported", E_USER_ERROR);
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break;
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}
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}
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}
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/**
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* Parses a fix name and determines what kind of fix it is, as well
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* as other information defined by the fix
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* @param $name String name of fix
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* @return array(string $fix_type, array $fix_parameters)
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* @note $fix_parameters is type dependant, see populate() for usage
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* of these parameters
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*/
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public function getFixType($name)
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{
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// parse it
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$property = $attr = null;
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if (strpos($name, '#') !== false) {
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list($name, $property) = explode('#', $name);
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}
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if (strpos($name, '@') !== false) {
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list($name, $attr) = explode('@', $name);
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}
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// figure out the parameters
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$params = array();
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if ($name !== '') {
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$params['element'] = $name;
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}
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if (!is_null($attr)) {
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$params['attr'] = $attr;
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}
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// special case: attribute transform
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if (!is_null($attr)) {
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if (is_null($property)) {
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$property = 'pre';
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}
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$type = 'attr_transform_' . $property;
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return array($type, $params);
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}
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// special case: tag transform
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if (is_null($property)) {
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return array('tag_transform', $params);
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}
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return array($property, $params);
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}
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/**
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* Defines all fixes the module will perform in a compact
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* associative array of fix name to fix implementation.
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* @return array
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*/
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public function makeFixes()
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{
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}
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}
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// vim: et sw=4 sts=4
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