mirror of
https://github.com/ezyang/htmlpurifier.git
synced 2024-11-13 00:38:42 +00:00
14f481bcf6
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@97 48356398-32a2-884e-a903-53898d9a118a
445 lines
16 KiB
PHP
445 lines
16 KiB
PHP
<?php
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require_once 'HTMLPurifier/AttrDef.php';
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require_once 'HTMLPurifier/ChildDef.php';
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require_once 'HTMLPurifier/Generator.php';
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require_once 'HTMLPurifier/Token.php';
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class HTMLPurifier_Definition
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{
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var $generator;
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var $info = array();
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var $info_closes_p = array(
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// these are all block elements: blocks aren't allowed in P
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'address' => true,
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'blockquote' => true,
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'dd' => true,
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'dir' => true,
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'div' => true,
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'dl' => true,
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'dt' => true,
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'h1' => true,
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'h2' => true,
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'h3' => true,
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'h4' => true,
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'h5' => true,
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'h6' => true,
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'hr' => true,
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'ol' => true,
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'p' => true,
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'pre' => true,
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'table' => true,
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'ul' => true
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);
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function HTMLPurifier_Definition() {
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$this->generator = new HTMLPurifier_Generator();
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}
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function loadData() {
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// emulates the structure of the DTD
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// entities: prefixed with e_ and _ replaces .
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// we don't use an array because that complicates interpolation
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// strings are used instead of arrays because if you use arrays,
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// you have to do some hideous manipulation with array_merge()
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// these are condensed, remember, with bad stuff taken out
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// transforms: font, menu, dir, center
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// DON'T MONKEY AROUND THIS unless you know what you are doing
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// and also know the assumptions the code makes about what this
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// contains for optimization purposes (see fixNesting)
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$e_special_extra = 'img';
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$e_special_basic = 'br | span | bdo';
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$e_special = "$e_special_basic | $e_special_extra";
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$e_fontstyle_extra = 'big | small';
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$e_fontstyle_basic = 'tt | i | b | u | s | strike';
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$e_fontstyle = "$e_fontstyle_basic | $e_fontstyle_extra";
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$e_phrase_extra = 'sub | sup';
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$e_phrase_basic = 'em | strong | dfn | code | q | samp | kbd | var'.
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' | cite | abbr | acronym';
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$e_phrase = "$e_phrase_basic | $e_phrase_extra";
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$e_inline_forms = ''; // humor the dtd
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$e_misc_inline = 'ins | del';
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$e_misc = "$e_misc_inline";
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$e_inline = "a | $e_special | $e_fontstyle | $e_phrase".
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" | $e_inline_forms";
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// note the casing
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$e_Inline = new HTMLPurifier_ChildDef_Optional("#PCDATA | $e_inline".
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" | $e_misc_inline");
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$e_heading = 'h1|h2|h3|h4|h5|h6';
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$e_lists = 'ul | ol | dl';
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$e_blocktext = 'pre | hr | blockquote | address';
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$e_block = "p | $e_heading | div | $e_lists | $e_blocktext | table";
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$e_Flow = new HTMLPurifier_ChildDef_Optional("#PCDATA | $e_block".
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" | $e_inline | $e_misc");
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$e_a_content = new HTMLPurifier_ChildDef_Optional("#PCDATA | $e_special".
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" | $e_fontstyle | $e_phrase | $e_inline_forms | $e_misc_inline");
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$e_pre_content = new HTMLPurifier_ChildDef_Optional("#PCDATA | a".
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" | $e_special_basic | $e_fontstyle_basic | $e_phrase_basic".
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" | $e_inline_forms | $e_misc_inline");
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$e_form_content = new HTMLPurifier_ChildDef_Optional(''); //unused
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$e_form_button_content = new HTMLPurifier_ChildDef_Optional(''); // unused
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$this->info['ins'] =
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$this->info['del'] =
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$this->info['blockquote'] =
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$this->info['dd'] =
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$this->info['li'] =
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$this->info['div'] = new HTMLPurifier_ElementDef($e_Flow);
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$this->info['em'] =
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$this->info['strong'] =
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$this->info['dfn'] =
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$this->info['code'] =
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$this->info['samp'] =
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$this->info['kbd'] =
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$this->info['var'] =
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$this->info['code'] =
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$this->info['samp'] =
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$this->info['kbd'] =
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$this->info['var'] =
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$this->info['cite'] =
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$this->info['abbr'] =
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$this->info['acronym'] =
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$this->info['q'] =
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$this->info['sub'] =
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$this->info['tt'] =
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$this->info['sup'] =
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$this->info['i'] =
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$this->info['b'] =
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$this->info['big'] =
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$this->info['small'] =
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$this->info['u'] =
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$this->info['s'] =
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$this->info['strike'] =
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$this->info['bdo'] =
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$this->info['span'] =
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$this->info['dt'] =
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$this->info['p'] =
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$this->info['h1'] =
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$this->info['h2'] =
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$this->info['h3'] =
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$this->info['h4'] =
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$this->info['h5'] =
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$this->info['h6'] = new HTMLPurifier_ElementDef($e_Inline);
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$this->info['ol'] =
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$this->info['ul'] =
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new HTMLPurifier_ElementDef(
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new HTMLPurifier_ChildDef_Required('li')
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);
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$this->info['dl'] =
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new HTMLPurifier_ElementDef(
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new HTMLPurifier_ChildDef_Required('dt|dd')
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);
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$this->info['address'] =
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new HTMLPurifier_ElementDef(
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new HTMLPurifier_ChildDef_Optional("#PCDATA | p | $e_inline".
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" | $e_misc_inline")
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);
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$this->info['img'] =
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$this->info['br'] =
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$this->info['hr'] = new HTMLPurifier_ElementDef(new HTMLPurifier_ChildDef_Empty());
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$this->info['pre'] = new HTMLPurifier_ElementDef($e_pre_content);
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$this->info['a'] = new HTMLPurifier_ElementDef($e_a_content);
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}
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function purifyTokens($tokens) {
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if (empty($this->info)) $this->loadData();
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$tokens = $this->removeForeignElements($tokens);
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$tokens = $this->makeWellFormed($tokens);
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$tokens = $this->fixNesting($tokens);
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$tokens = $this->validateAttributes($tokens);
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return $tokens;
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}
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function removeForeignElements($tokens) {
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if (empty($this->info)) $this->loadData();
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$result = array();
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foreach($tokens as $token) {
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if (!empty( $token->is_tag )) {
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if (!isset($this->info[$token->name])) {
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// invalid tag, generate HTML and insert in
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$token = new HTMLPurifier_Token_Text(
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$this->generator->generateFromToken($token)
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);
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}
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} elseif ($token->type == 'comment') {
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// strip comments
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continue;
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} elseif ($token->type == 'text') {
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} else {
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continue;
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}
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$result[] = $token;
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}
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return $result;
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}
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function makeWellFormed($tokens) {
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if (empty($this->info)) $this->loadData();
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$result = array();
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$current_nesting = array();
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foreach ($tokens as $token) {
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if (empty( $token->is_tag )) {
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$result[] = $token;
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continue;
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}
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$info = $this->info[$token->name]; // assumption but valid
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// test if it claims to be a start tag but is empty
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if ($info->child_def->type == 'empty' &&
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$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->child_def->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($current_nesting)) {
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$current_parent = array_pop($current_nesting);
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// check if we're closing a P tag
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if ($current_parent->name == 'p' &&
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isset($this->info_closes_p[$token->name])
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) {
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$result[] = new HTMLPurifier_Token_End('p');
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$result[] = $token;
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$current_nesting[] = $token;
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continue;
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}
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// check if we're closing a LI tag
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if ($current_parent->name == 'li' &&
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$token->name == 'li'
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) {
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$result[] = new HTMLPurifier_Token_End('li');
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$result[] = $token;
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$current_nesting[] = $token;
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continue;
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}
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// this is more TIDY stuff
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// we should also get some TABLE related code
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// mismatched h#
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$current_nesting[] = $current_parent; // undo the pop
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}
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$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($current_nesting)) {
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$result[] = new HTMLPurifier_Token_Text(
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$this->generator->generateFromToken($token)
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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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$result[] = new HTMLPurifier_Token_Text(
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$this->generator->generateFromToken($token)
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);
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continue;
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}
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// okay, we found it, close all the skipped tags
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// note that skipped tags contains the element we need closed
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$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 $result;
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}
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function fixNesting($tokens) {
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if (empty($this->info)) $this->loadData();
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// insert implicit "parent" node, will be removed at end
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array_unshift($tokens, new HTMLPurifier_Token_Start('div'));
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$tokens[] = new HTMLPurifier_Token_End('div');
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for ($i = 0, $size = count($tokens) ; $i < $size; ) {
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$child_tokens = array();
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// scroll to the end of this node, and report number
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for ($j = $i, $depth = 0; ; $j++) {
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if ($tokens[$j]->type == 'start') {
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$depth++;
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// skip token assignment on first iteration
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if ($depth == 1) continue;
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} elseif ($tokens[$j]->type == 'end') {
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$depth--;
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// skip token assignment on last iteration
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if ($depth == 0) break;
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}
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$child_tokens[] = $tokens[$j];
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}
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// $i is index of start token
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// $j is index of end token
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// have DTD child def validate children
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$element_def = $this->info[$tokens[$i]->name];
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$result = $element_def->child_def->validateChildren($child_tokens);
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// process result
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if ($result === true) {
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// leave the nodes as is
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} elseif($result === false) {
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// WARNING WARNING WARNING!!!
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// While for the original DTD, there will never be
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// cascading removal, more complex ones may have such
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// a problem.
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// If you modify the info array such that an element
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// that requires children may contain a child that requires
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// children, you need to also scroll back and re-check that
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// elements parent node
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$length = $j - $i + 1;
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// remove entire node
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array_splice($tokens, $i, $length);
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// change size
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$size -= $length;
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// ensure that we scroll to the next node
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$i--;
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} else {
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$length = $j - $i - 1;
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// replace node with $result
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array_splice($tokens, $i + 1, $length, $result);
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// change size
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$size -= $length;
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$size += count($result);
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}
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// scroll to next node
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$i++;
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while ($i < $size and $tokens[$i]->type != 'start') $i++;
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}
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// remove implicit divs
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array_shift($tokens);
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array_pop($tokens);
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return $tokens;
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}
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function validateAttributes($tokens) {
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if (empty($this->info)) $this->loadData();
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}
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}
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class HTMLPurifier_ElementDef
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{
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var $child_def;
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var $attr_def = array();
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function HTMLPurifier_ElementDef($child_def, $attr_def = array()) {
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$this->child_def = $child_def;
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$this->attr_def = $attr_def;
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}
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}
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?>
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