mirror of
https://github.com/ezyang/htmlpurifier.git
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14aeafcf22
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@350 48356398-32a2-884e-a903-53898d9a118a
158 lines
5.6 KiB
PHP
158 lines
5.6 KiB
PHP
<?php
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require_once 'HTMLPurifier/Strategy.php';
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require_once 'HTMLPurifier/HTMLDefinition.php';
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require_once 'HTMLPurifier/Generator.php';
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/**
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* Takes tokens makes them well-formed (balance end tags, etc.)
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*/
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class HTMLPurifier_Strategy_MakeWellFormed extends HTMLPurifier_Strategy
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{
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function execute($tokens, $config) {
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$definition = $config->getHTMLDefinition();
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$generator = new HTMLPurifier_Generator();
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$result = array();
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$current_nesting = array();
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$escape_invalid_tags = $config->get('Core', 'EscapeInvalidTags');
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foreach ($tokens as $token) {
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if (empty( $token->is_tag )) {
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$result[] = $token;
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continue;
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}
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// DEFINITION CALL
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$info = $definition->info[$token->name]->child;
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// test if it claims to be a start tag but is empty
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if ($info->type == 'empty' &&
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$token->type == 'start' ) {
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$result[] = new HTMLPurifier_Token_Empty($token->name,
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$token->attributes);
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continue;
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}
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// test if it claims to be empty but really is a start tag
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if ($info->type != 'empty' &&
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$token->type == 'empty' ) {
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$result[] = new HTMLPurifier_Token_Start($token->name,
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$token->attributes);
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$result[] = new HTMLPurifier_Token_End($token->name);
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continue;
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}
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// automatically insert empty tags
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if ($token->type == 'empty') {
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$result[] = $token;
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continue;
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}
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// we give start tags precedence, so automatically accept unless...
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// it's one of those special cases
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if ($token->type == 'start') {
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// if there's a parent, check for special case
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if (!empty($current_nesting)) {
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$parent = array_pop($current_nesting);
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$parent_name = $parent->name;
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$parent_info = $definition->info[$parent_name];
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if (isset($parent_info->auto_close[$token->name])) {
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$result[] = new HTMLPurifier_Token_End($parent_name);
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$result[] = $token;
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$current_nesting[] = $token;
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continue;
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}
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$current_nesting[] = $parent; // undo the pop
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}
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$result[] = $token;
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$current_nesting[] = $token;
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continue;
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}
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// sanity check
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if ($token->type != 'end') continue;
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// okay, we're dealing with a closing tag
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// make sure that we have something open
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if (empty($current_nesting)) {
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if ($escape_invalid_tags) {
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$result[] = new HTMLPurifier_Token_Text(
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$generator->generateFromToken($token, $config)
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);
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}
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continue;
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}
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// first, check for the simplest case: everything closes neatly
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// current_nesting is modified
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$current_parent = array_pop($current_nesting);
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if ($current_parent->name == $token->name) {
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$result[] = $token;
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continue;
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}
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// undo the array_pop
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$current_nesting[] = $current_parent;
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// okay, so we're trying to close the wrong tag
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// scroll back the entire nest, trying to find our tag
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// feature could be to specify how far you'd like to go
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$size = count($current_nesting);
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// -2 because -1 is the last element, but we already checked that
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$skipped_tags = false;
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for ($i = $size - 2; $i >= 0; $i--) {
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if ($current_nesting[$i]->name == $token->name) {
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// current nesting is modified
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$skipped_tags = array_splice($current_nesting, $i);
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break;
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}
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}
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// we still didn't find the tag, so translate to text
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if ($skipped_tags === false) {
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if ($escape_invalid_tags) {
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$result[] = new HTMLPurifier_Token_Text(
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$generator->generateFromToken($token, $config)
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);
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}
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continue;
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}
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// okay, we found it, close all the skipped tags
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// note that skipped tags contains the element we need closed
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$size = count($skipped_tags);
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for ($i = $size - 1; $i >= 0; $i--) {
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$result[] = new HTMLPurifier_Token_End($skipped_tags[$i]->name);
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}
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// done!
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}
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// we're at the end now, fix all still unclosed tags
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if (!empty($current_nesting)) {
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$size = count($current_nesting);
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for ($i = $size - 1; $i >= 0; $i--) {
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$result[] =
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new HTMLPurifier_Token_End($current_nesting[$i]->name);
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}
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}
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return $result;
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}
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}
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?>
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