Tag 1.5.0.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/tags/1.5.0@871 48356398-32a2-884e-a903-53898d9a118a

Doxyfile

@@ -4,7 +4,7 @@
 # Project related configuration options
 #---------------------------------------------------------------------------
 PROJECT_NAME           = HTML Purifier
-PROJECT_NUMBER         = 1.2.0
+PROJECT_NUMBER         = 1.5.0
 OUTPUT_DIRECTORY       = "C:/Documents and Settings/Edward/My Documents/My Webs/htmlpurifier/docs/doxygen"
 CREATE_SUBDIRS         = NO
 OUTPUT_LANGUAGE        = English

INSTALL

@@ -8,6 +8,7 @@ installation GUI, you've come to the wrong place!)  The impatient can scroll
 down to the bottom of this INSTALL document to see the code, but you really
 should make sure a few things are properly done.
 
+Todo: Convert to using the array syntax for configuration.
 
 
 1.  Compatibility

NEWS

@@ -9,6 +9,111 @@ NEWS ( CHANGELOG and HISTORY )                                     HTMLPurifier
     . Internal change
 ==========================
 
+1.5.0, released 2007-03-23
+! Added a rudimentary I18N and L10N system modeled off MediaWiki. It
+  doesn't actually do anything yet, but keep your eyes peeled.
+! docs/enduser-utf8.html explains how to use UTF-8 and HTML Purifier
+! Newly structured HTMLDefinition modeled off of XHTML 1.1 modules.
+  I am loathe to release beta quality APIs, but this is exactly that;
+  don't use the internal interfaces if you're not willing to do migration
+  later on.
+- Allow 'x' subtag in language codes
+- Fixed buggy chameleon-support for ins and del
+. Added support for IDREF attributes (i.e. for)
+. Renamed HTMLPurifier_AttrDef_Class to HTMLPurifier_AttrDef_Nmtokens
+. Removed context variable ParentType, replaced with IsInline, which
+  is false when you're not inline and an integer of the parent that
+  caused you to become inline when you are (so possibly zero)
+. Removed ElementDef->type in favor of ElementDef->descendants_are_inline
+  and HTMLDefinition->content_sets
+. StrictBlockquote now reports what elements its supposed to allow,
+  rather than what it does allow
+. Removed HTMLDefinition->info_flow_elements in favor of
+  HTMLDefinition->content_sets['Flow']
+. Removed redundant "exclusionary" definitions from DTD roster
+. StrictBlockquote now requires a construction parameter as if it
+  were an Required ChildDef, this is the "real" set of allowed elements
+. AttrDef partitioned into HTML, CSS and URI segments
+. Modify Youtube filter regexp to be multiline
+. Require both PHP5 and DOM extension in order to use DOMLex, fixes
+  some edge cases where a DOMDocument class exists in a PHP4 environment
+  due to DOM XML extension.
+
+1.4.1, released 2007-01-21
+! docs/enduser-youtube.html updated according to new functionality
+- YouTube IDs can have underscores and dashes
+
+1.4.0, released 2007-01-21
+! Implemented list-style-image, URIs now allowed in list-style
+! Implemented background-image, background-repeat, background-attachment
+  and background-position CSS properties. Shorthand property background
+  supports all of these properties.
+! Configuration documentation looks nicer
+! Added %Core.EscapeNonASCIICharacters to workaround loss of Unicode
+  characters while %Core.Encoding is set to a non-UTF-8 encoding.
+! Support for configuration directive aliases added
+! Config object can now be instantiated from ini files
+! YouTube preservation code added to the core, with two lines of code
+  you can add it as a filter to your code. See smoketests/preserveYouTube.php
+  for sample code.
+! Moved SLOW to docs/enduser-slow.html and added code examples
+- Replaced version check with functionality check for DOM (thanks Stephen
+  Khoo)
+. Added smoketest 'all.php', which loads all other smoketests via frames
+. Implemented AttrDef_CSSURI for url(http://google.com) style declarations
+. Added convenient single test selector form on test runner
+
+1.3.2, released 2006-12-25
+! HTMLPurifier object now accepts configuration arrays, no need to manually
+  instantiate a configuration object
+! Context object now accessible to outside
+! Added enduser-youtube.html, explains how to embed YouTube videos. See
+  also corresponding smoketest preserveYouTube.php.
+! Added purifyArray(), which takes a list of HTML and purifies it all
+! Added static member variable $version to HTML Purifier with PHP-compatible
+  version number string.
+- Fixed fatal error thrown by upper-cased language attributes
+- printDefinition.php: added labels, added better clarification
+. HTMLPurifier_Config::create() added, takes mixed variable and converts into
+  a HTMLPurifier_Config object.
+
+1.3.1, released 2006-12-06
+! Added HTMLPurifier.func.php stub for a convenient function to call the library
+- Fixed bug in RemoveInvalidImg code that caused all images to be dropped
+  (thanks to .mario for reporting this)
+. Standardized all attribute handling variables to attr, made it plural
+
+1.3.0, released 2006-11-26
+# Invalid images are now removed, rather than replaced with a dud
+  <img src="" alt="Invalid image" />. Previous behavior can be restored
+  with new directive %Core.RemoveInvalidImg set to false.
+! (X)HTML Strict now supported
+  + Transparently handles inline elements in block context (blockquote)
+! Added GET method to demo for easier validation, added 50kb max input size
+! New directive %HTML.BlockWrapper, for block-ifying inline elements
+! New directive %HTML.Parent, allows you to only allow inline content
+! New directives %HTML.AllowedElements and %HTML.AllowedAttributes to let
+  users narrow the set of allowed tags
+! <li value="4"> and <ul start="2"> now allowed in loose mode
+! New directives %URI.DisableExternalResources and %URI.DisableResources
+! New directive %Attr.DisableURI, which eliminates all hyperlinking
+! New directive %URI.Munge, munges URI so you can use some sort of redirector
+  service to avoid PageRank leaks or warn users that they are exiting your site.
+! Added spiffy new smoketest printDefinition.php, which lets you twiddle with
+  the configuration settings and see how the internal rules are affected.
+! New directive %URI.HostBlacklist for blocking links to bad hosts.
+  xssAttacks.php smoketest updated accordingly.
+- Added missing type to ChildDef_Chameleon
+- Remove Tidy option from demo if there is not Tidy available
+. ChildDef_Required guards against empty tags
+. Lookup table HTMLDefinition->info_flow_elements added
+. Added peace-of-mind variable initialization to Strategy_FixNesting
+. Added HTMLPurifier->info_parent_def, parent child processing made special
+. Added internal documents briefly summarizing future progression of HTML
+. HTMLPurifier_Config->getBatch($namespace) added
+. More lenient casting to bool from string in HTMLPurifier_ConfigSchema
+. Refactored ChildDef classes into their own files
+
 1.2.0, released 2006-11-19
 # ID attributes now disabled by default. New directives:
   + %HTML.EnableAttrID - restores old behavior by allowing IDs

README

@@ -1,13 +1,22 @@
 
 README
-    All about HTMLPurifier
+    All about HTML Purifier
 
-HTMLPurifier is an HTML filtering solution.  It uses a unique combination of
-robust whitelists and agressive parsing to ensure that not only are XSS
-attacks thwarted, but the resulting HTML is standards compliant.
+HTML Purifier is an HTML filtering solution that uses a unique combination 
+of robust whitelists and agressive parsing to ensure that not only are 
+XSS attacks thwarted, but the resulting HTML is standards compliant. 
 
-See INSTALL on how to use the library.  See docs/ for more developer-oriented
-documentation as well as some code examples.  Users of TinyMCE or FCKeditor
-may be especially interested in WYSIWYG.
+HTML Purifier is oriented towards richly formatted documents from 
+untrusted sources that require CSS and a full tag-set.  This library can 
+be configured to accept a more restrictive set of tags, but it won't be 
+as efficient as more bare-bones parsers. It will, however, do the job 
+right, which may be more important. 
 
-HTMLPurifier can be found on the web at: http://hp.jpsband.org/
+Places to go:
+
+* See INSTALL for a quick installation guide
+* See docs/ for developer-oriented documentation, code examples and
+  an in-depth installation guide.
+* See WYSIWYG for information on editors like TinyMCE and FCKeditor
+
+HTML Purifier can be found on the web at: http://hp.jpsband.org/

SLOW

@@ -1,40 +0,0 @@
-
-SLOW
-  also known as the HELP ME LIBRARY IS TOO SLOW MY PAGE TAKE TOO LONG LOAD page
-
-HTML Purifier is a very powerful library.  But with power comes great
-responsibility, or, at least, longer execution times.  Remember, this
-library isn't lightly grazing over submitted HTML: it's deconstructing
-the whole thing, rigorously checking the parts, and then putting it
-back together.
-
-So, if it so turns out that HTML Purifier is kinda too slow for outbound
-filtering, you've got a few options:
-
-1. Inbound filtering - perform filtering of HTML when it's submitted by the
-user.  Since the user is already submitting something, an extra half a
-second tacked on to the load time probably isn't going to be that huge of
-a problem.  Then, displaying the content is a simple a manner of outputting
-it directly from your database/filesystem.  The trouble with this method is
-that your user loses the original text, and when doing edits, will be
-handling the filtered text.  While this may be a good thing, especially if
-you're using a WYSIWYG editor, it can also result in data-loss if a user
-makes a typo.
-
-2. Caching the filtered output - accept the submitted text and put it
-unaltered into the database, but then also generate a filtered version and
-stash that in the database.  Serve the filtered version to readers, and the
-unaltered version to editors.  If need be, you can invalidate the cache and
-have the cached filtered version be regenerated on the first page view.  Pros?
-Full data retention.  Cons?  It's more complicated, and opens other editors
-up to XSS if they are using a WYSIWYG editor (to fix that, they'd have to
-be able to get their hands on the *really* original text served in plaintext
-mode).
-
-In short, inbound filtering is almost as simple as outbound filtering, but
-it has some drawbacks which cannot be fixed unless you save both the original
-and the filtered versions.
-
-There is a third option: profile and optimize HTMLPurifier yourself.  Be sure
-to report back your results if you decide to do that!  Especially if you
-port HTML Purifier to C++.  ;-)

TODO

@@ -1,72 +1,89 @@
 
 TODO List
 
-1.3 release
- - Make URI validation routines tighter (especially mailto)
- - More extensive URI filtering schemes (see docs/proposal-new-directives.txt)
- - Allow for background-image and list-style-image (see above)
- - Error logging for filtering/cleanup procedures
- - Rich set* methods and config file loaders for HTMLPurifier_Config
+= KEY ====================
+    # Flagship
+    - Regular
+    ? At-risk
+==========================
 
-1.4 release
- - Add various "levels" of cleaning
-    - Related: Allow strict (X)HTML
+1.6 release
+ # Implement all non-essential attribute transforms, configurable
+ # URI validation routines tighter (see docs/dev-code-quality.html) (COMPLEX)
+ # Advanced URI filtering schemes (see docs/proposal-new-directives.txt)
+ # Error logging for filtering/cleanup procedures
+    - Requires I18N facilities to be created first (COMPLEX)
+ ? Configuration profiles: sets of directives that get set with one func call
+ - XSS-attempt detection
+ - Implement IDREF support
+
+1.7 release
+ # Add pre-packaged "levels" of cleaning (custom behavior already done)
  - More fine-grained control over escaping behavior
     - Silently drop content inbetween SCRIPT tags (can be generalized to allow
       specification of elements that, when detected as foreign, trigger removal
       of children, although unbalanced tags could wreck havoc (or at least
       delete the rest of the document)).
+ - Allow specifying global attributes on a tag-by-tag basis in
+   %HTML.AllowAttributes
+ ? More user-friendly warnings when %HTML.Allow* attempts to specify a
+   tag or attribute that is not supported
+ - Parse TinyMCE whitelist into our %HTML.Allow* whitelists
 
-1.5 release
- - Additional support for poorly written HTML
-    - Implement all non-essential attribute transforms
-    - Microsoft Word HTML cleaning (i.e. MsoNormal)
-
-2.0 release
- - Formatters for plaintext
-    - Auto-paragraphing (be sure to leverage fact that we know when things
-      shouldn't be paragraphed, such as lists and tables).
-    - Linkify URLs
-    - Smileys
-    - Linkification for HTML Purifier docs: notably configuration and
-      class names
-
-3.0 release
- - Extended HTML capabilities based on namespacing and tag transforms
-    - Hooks for adding custom processors to custom namespaced tags and
-      attributes, offer default implementation
-    - Lots of documentation and samples
-
-Ongoing
- - Lots of profiling, make it faster!
- - Plugins for major CMSes (very tricky issue)
-
-Unknown release (on a scratch-an-itch basis)
- - Fixes for Firefox's inability to handle COL alignment props (Bug 915)
- - Automatically add non-breaking spaces to empty table cells when
-   empty-cells:show is applied to have compatibility with Internet Explorer
- - Convert RTL/LTR override characters to <bdo> tags, or vice versa on demand.
-   Also, enable disabling of directionality
- - Append something to duplicate IDs so they're still usable (impl. note: the
-   dupe detector would also need to detect the suffix as well)
- - Have 'lang' attribute be checked against official lists
-
-Encoding workarounds
- - Non-lossy dumb alternate character encoding transformations, achieved by
-   numerically encoding all non-ASCII characters
- - Semi-lossy dumb alternate character encoding transformations, achieved by
-   encoding all characters that have string entity equivalents
-
-Requested
- - Native content compression, whitespace stripping (don't rely on Tidy, make
-   sure we don't remove from <pre> or related tags)
- - Win32 Phalanger C# binaries (?)
+1.8 release
+ # Additional support for poorly written HTML
+    - Microsoft Word HTML cleaning (i.e. MsoNormal, but research essential!)
+    - Friendly strict handling of <address> (block -> <br>)
  - Remove redundant tags, ex. <u><u>Underlined</u></u>. Implementation notes:
     1. Analyzing which tags to remove duplicants
     2. Ensure attributes are merged into the parent tag
     3. Extend the tag exclusion system to specify whether or not the
     contents should be dropped or not (currently, there's code that could do
     something like this if it didn't drop the inner text too.)
+ - Remove <span> tags that don't do anything (no attributes)
+ - Remove empty inline tags<i></i>
+ - Append something to duplicate IDs so they're still usable (impl. note: the
+   dupe detector would also need to detect the suffix as well)
+
+2.0 release
+ # Legit token based CSS parsing (will require revamping almost every
+   AttrDef class)
+ # Formatters for plaintext (COMPLEX)
+    - Auto-paragraphing (be sure to leverage fact that we know when things
+      shouldn't be paragraphed, such as lists and tables).
+    - Linkify URLs
+    - Smileys
+    - Linkification for HTML Purifier docs: notably configuration and classes
+
+3.0 release
+ - Extended HTML capabilities based on namespacing and tag transforms (COMPLEX)
+    - Hooks for adding custom processors to custom namespaced tags and
+      attributes, offer default implementation
+    - Lots of documentation and samples
+ - Allow tags to be "armored", an internal flag that protects them
+   from validation and passes them out unharmed
+ - XHTML 1.1 support
+ - Fixes for Firefox's inability to handle COL alignment props (Bug 915)
+ - Automatically add non-breaking spaces to empty table cells when
+   empty-cells:show is applied to have compatibility with Internet Explorer
+ - Convert RTL/LTR override characters to <bdo> tags, or vice versa on demand.
+   Also, enable disabling of directionality
+
+Ongoing
+ - Lots of profiling, make it faster!
+ - Plugins for major CMSes (COMPLEX)
+    - WordPress
+    - eFiction
+    - more! (look for ones that use WYSIWYGs)
+
+Unknown release (on a scratch-an-itch basis)
+ - Have 'lang' attribute be checked against official lists
+ ? Semi-lossy dumb alternate character encoding transformations, achieved by
+   encoding all characters that have string entity equivalents
+
+Requested
+ ? Native content compression, whitespace stripping (don't rely on Tidy, make
+   sure we don't remove from <pre> or related tags)
 
 Wontfix
  - Non-lossy smart alternate character encoding transformations (unless

WYSIWYG

@@ -18,4 +18,5 @@ HTML Purifier is perfect for filtering pure-HTML input from WYSIWYG editors.
 Enough said.
 
 There is a proof-of-concept integration of HTML Purifier with the Mantis
-bugtracker at http://hp.jpsband.org/mantis/
+bugtracker at http://hp.jpsband.org/mantis/ You can see notes on how
+this integration was acheived at http://hp.jpsband.org/mantis_notes.txt

benchmarks/Lexer.php

@@ -7,6 +7,7 @@ set_include_path(get_include_path() . PATH_SEPARATOR . '../library/');
 
 require_once 'HTMLPurifier/ConfigSchema.php';
 require_once 'HTMLPurifier/Config.php';
+require_once 'HTMLPurifier/Context.php';
 
 $LEXERS = array();
 $RUNS = isset($GLOBALS['HTMLPurifierTest']['Runs'])
@@ -93,11 +94,14 @@ function print_lexers() {
 function do_benchmark($name, $document) {
     global $LEXERS, $RUNS;
     
+    $config = HTMLPurifier_Config::createDefault();
+    $context = new HTMLPurifier_Context();
+    
     $timer = new RowTimer($name);
     $timer->start();
     
     foreach($LEXERS as $key => $lexer) {
-        for ($i=0; $i<$RUNS; $i++) $tokens = $lexer->tokenizeHTML($document);
+        for ($i=0; $i<$RUNS; $i++) $tokens = $lexer->tokenizeHTML($document, $config, $context);
         $timer->setMarker($key);
     }
     

benchmarks/ProfileDirectLex.php

@@ -5,12 +5,15 @@ set_include_path(get_include_path() . PATH_SEPARATOR . '../library/');
 require_once 'HTMLPurifier/ConfigSchema.php';
 require_once 'HTMLPurifier/Config.php';
 require_once 'HTMLPurifier/Lexer/DirectLex.php';
+require_once 'HTMLPurifier/Context.php';
 
 $input = file_get_contents('samples/Lexer/4.html');
 $lexer = new HTMLPurifier_Lexer_DirectLex();
+$config = HTMLPurifier_Config::createDefault();
+$context = new HTMLPurifier_Context();
 
 for ($i = 0; $i < 10; $i++) {
-    $tokens = $lexer->tokenizeHTML($input);
+    $tokens = $lexer->tokenizeHTML($input, $config, $context);
 }
 
 ?>

configdoc/generate.php

@@ -99,6 +99,8 @@ foreach($schema->info as $namespace_name => $namespace_info) {
     
     foreach ($namespace_info as $name => $info) {
         
+        if ($info->class == 'alias') continue;
+        
         $dom_directive = $dom_document->createElement('directive');
         $dom_namespace->appendChild($dom_directive);
         
@@ -186,7 +188,7 @@ $xsl_processor->importStylesheet($xsl_dom_stylesheet);
 $html_output = $xsl_processor->transformToXML($dom_document);
 
 // some slight fudges to preserve backwards compatibility
-$html_output = str_replace('/>', ' />', $html_output); // <br /> not <br>
+$html_output = str_replace('/>', ' />', $html_output); // <br /> not <br/>
 $html_output = str_replace(' xmlns=""', '', $html_output); // rm unnecessary xmlns
 
 if (class_exists('Tidy')) {

configdoc/styles/plain.css

@@ -1,3 +1,6 @@
+
+body {margin:1em 4em;}
+
 table {border-collapse:collapse;}
 table td, table th {padding:0.2em;}
 
@@ -8,3 +11,14 @@ table.constraints td pre {margin:0;}
 
 #toc {list-style-type:none; font-weight:bold;}
 #toc ul {list-style-type:disc; font-weight:normal;}
+
+.description p {margin-top:0;margin-bottom:1em;}
+
+#library, h1 {text-align:center; font-family:Garamond, serif;
+  font-variant:small-caps;}
+#library {font-size:1em;}
+h1 {margin-top:0;}
+h2 {border-bottom:1px solid #CCC; font-family:sans-serif; font-weight:normal;
+    font-size:1.3em;}
+h3 {font-family:sans-serif; font-size:1.1em; font-weight:bold; }
+h4 {font-family:sans-serif; font-size:0.9em; font-weight:bold; }

configdoc/styles/plain.xsl

@@ -18,12 +18,13 @@
     <xsl:template match="/">
         <html lang="en" xml:lang="en">
             <head>
-                <title><xsl:value-of select="/configdoc/title" /> Configuration Documentation</title>
+                <title>Configuration Documentation - <xsl:value-of select="/configdoc/title" /></title>
                 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
                 <link rel="stylesheet" type="text/css" href="styles/plain.css" />
             </head>
             <body>
-                <h1><xsl:value-of select="/configdoc/title" /> Configuration Documentation</h1>
+                <div id="library"><xsl:value-of select="/configdoc/title" /></div>
+                <h1>Configuration Documentation</h1>
                 <h2>Table of Contents</h2>
                 <ul id="toc">
                     <xsl:apply-templates mode="toc" />

docs/dev-advanced-api.html

@@ -0,0 +1,188 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+<meta name="description" content="Functional specification for HTML Purifier's advanced API for defining custom filtering behavior." />
+<link rel="stylesheet" type="text/css" href="style.css" />
+
+<title>Advanced API - HTML Purifier</title>
+
+</head><body>
+
+<h1>Advanced API</h1>
+
+<div id="filing">Filed under Development</div>
+<div id="index">Return to the <a href="index.html">index</a>.</div>
+<div id="home"><a href="http://hp.jpsband.org/">HTML Purifier</a> End-User Documentation</div>
+
+<p>It makes no sense to adopt a <q>one-size-fits-all</q> approach to
+filtersets: therefore, users must be able to define their own sets of
+<q>allowed</q> elements, as well as switch in-between doctypes of HTML.</p>
+
+<p>Our goals are to let the user:</p>
+
+<dl>
+    <dt>Select</dt>
+    <dd><ul>
+        <li>Doctype</li>
+        <li>Filtersets: Rich / Plain / Full ...</li>
+        <li>Mode: Lenient / Correctional</li>
+        <li>Collections (?): Safe / Unsafe</li>
+        <li>Modules / Tags / Attributes</li>
+    </ul></dd>
+    <dt>Customize</dt>
+    <dd><ul>
+        <li>Tags / Attributes / Attribute Types</li>
+        <li>Filtersets</li>
+        <li>Root Node</li>
+    </ul></dd>
+    <dt>Create</dt>
+    <dd><ul>
+        <li>Modules / Tags / Attributes / Attribute Types</li>
+        <li>Filtersets</li>
+        <li>Doctype</li>
+    </ul></dd>
+</dl>
+
+<h2>Select</h2>
+
+<h3>Selecting a Doctype</h3>
+
+<p>By default, users will use a doctype-based, permissive but secure
+whitelist.  They must define a <strong>doctype</strong>, and this serves
+as the first method of determining a filterset.</p>
+
+<p class="technical">This identifier is based
+on the name the W3C has given to the document type and <em>not</em>
+the DTD identifier.</p>
+
+<p>This parameter is set via the configuration object:</p>
+
+<pre>$config->set('HTML', 'Doctype', 'XHTML 1.0 Transitional');</pre>
+
+<h3>Selecting a Filterset</h3>
+
+<p>However, selecting this doctype doesn't mean much, because if we
+adhered exactly to the definition we would be letting XSS and other
+nasties through. HTML Purifier must, in its filterset, allow a subset
+of the doctype, which we shall call a <strong>filterset</strong>.</p>
+
+<p>By default, HTML Purifier will use the <strong>Rich</strong>
+filterset, which allows as many elements as possible with untrusted
+sources. Other possible filtersets could be:</p>
+
+<dl>
+    <dt>Full</dt>
+    <dd>Allows the full span of elements in the doctype, good if you want
+        HTML Purifier to work as a Tidy substitute but not to strip
+        anything out.</dd>
+    <dt>Plain</dt>
+    <dd>Provides a minimum set of tags for semantic markup of things
+        like blog comments.</dd>
+</dl>
+
+<p>Extension-authors would be able to define custom filtersets for
+other users to use.</p>
+
+<p>A possible call to select a filterset would be:</p>
+
+<pre>$config->set('HTML', 'Filterset', 'Rich');</pre>
+
+<h3>Selecting Mode</h3>
+
+<p>Within filtersets, there are various <strong>modes</strong> of operation.
+These indicate variant behaviors that, while not strictly changing the
+allowed set of elements and attributes, will definitely affect the output.
+Currently, we have two modes, which may be used together:</p>
+
+<dl>
+    <dt>Lenient</dt>
+    <dd>Deprecated elements and attributes will be transformed into
+        standards-compliant alternatives when explicitly disallowed. For
+        example, in the XHTML 1.0 Strict doctype, a <code>center</code>
+        tag would be turned into a <code>div</code> with the CSS property
+        <code>text-align:center;</code>, but in XHTML 1.0 Transitional
+        the tag would be preserved. This mode is on by default.</dd>
+    <dt>Correctional</dt>
+    <dd>Deprecated elements and attributes will be transformed into
+        standards-compliant alternatives whenever possible. Referring
+        back to the previous example, the <code>center</code> tag would
+        be transformed in both cases. However, tags without a
+        reasonable standards-compliant alternative will be preserved
+        in their form. This mode is on by default. It may have
+        various levels of operation.</dd>
+</dl>
+
+<p>A possible call to select modes would be:</p>
+
+<pre>$config->set('HTML', 'Mode', array('correctional', 'lenient'));</pre>
+
+<p>If modes have extra parameters, a hash might work well:</p>
+
+<pre>$config->set('HTML', 'Mode', array(
+    'correctional' => 9, // strongest level
+    'lenient' => true // this one's just boolean
+));</pre>
+
+<p>Modes may possibly be wrapped up with the filterset declaration:</p>
+
+<pre>$config->set('HTML', 'Filterset', 'Rich: correctional, lenient');</pre>
+
+<p>Further investigation in this field is necessary.</p>
+
+<h3>Selecting Modules / Tags / Attributes</h3>
+
+<p>If this cookie cutter approach doesn't appeal to a user, they may
+decide to roll their own filterset by selecting modules, tags and
+attributes to allow.</p>
+
+<p class="technical">This would make use of the same facilities
+as a filterset author would use, except that it would go under an
+<q>anonymous</q> filterset that would be auto-selected if any of the
+relevant module/tag/attribute selection configuration directives were
+non-null.</p>
+
+<p>On the highest level, a user will usually be most interested in
+directly specifying which elements and attributes are desired. For
+example:</p>
+
+<pre>$config->set('HTML', 'AllowedElements', 'a,b,em,p,blockquote,code,i');</pre>
+
+<p>Attribute declarations could be merged into this declaration as such:</p>
+
+<pre>$config->set('HTML', 'Allowed', 'a[href,title],b,em,p[class],blockquote[cite],code,i');</pre>
+
+<p>...or be kept separate:</p>
+
+<pre>$config->set('HTML', 'AllowedAttributes', 'a.href,a.title,p.class,blockquote.cite');</pre>
+
+<p class="technical">Considering that, internally speaking, as mandated by
+the XHTML 1.1 Modularization specification, we have organized our
+elements around modules, considerable gymnastics will be needed to
+get this sort of functionality working.</p>
+
+<p>A user may also specify a module to load a class of elements and attributes
+into their filterest:</p>
+
+<pre>$config->set('HTML', 'Allowed', 'Hypertext,Core');</pre>
+
+<p class="fixme">The granularity of these modules is too coarse for
+the average user (for example, the core module loads everything from
+the essential <code>p</code> tag to the not-so-safe <code>h1</code>
+tag). How do we make this still a viable solution?</p>
+
+<h3>Unified selector</h3>
+
+<p>Because selecting each and every one of these configuration options
+is a chore, we may wish to offer a specialized configuration method
+for selecting a filterset. Possibility:</p>
+
+<pre>function selectFilter($doctype, $filterset, $mode)</pre>
+
+<p>...which is simply a light wrapper over the individual configuration
+calls. A custom config file format or text format could also be adopted.</p>
+
+<div id="version">$Id$</div>
+
+</body></html>

docs/dev-code-quality.html

@@ -14,6 +14,7 @@
 
 <div id="filing">Filed under Development</div>
 <div id="index">Return to the <a href="index.html">index</a>.</div>
+<div id="home"><a href="http://hp.jpsband.org/">HTML Purifier</a> End-User Documentation</div>
 
 <p>Okay, face it.  Programmers can get lazy, cut corners, or make mistakes. They
 also can do quick prototypes, and then forget to rewrite them later.  Well,
@@ -22,6 +23,8 @@ of code that should be aggressively refactored.  This does not list
 optimization issues, that needs to be done after intense profiling.</p>
 
 <pre>
+docs/examples/demo.php - ad hoc HTML/PHP soup to the extreme
+
 AttrDef
     Class - doesn't support Unicode characters (fringe); uses regular
         expressions
@@ -32,7 +35,8 @@ AttrDef
     Number - constructor interface inconsistent with Integer
 ConfigSchema - redefinition is a mess
 Strategy
-    FixNesting - cannot bubble nodes out of structures
+    FixNesting - cannot bubble nodes out of structures, duplicated checks
+        for special-case parent node
     MakeWellFormed - insufficient automatic closing definitions (check HTML
         spec for optional end tags, also, closing based on type (block/inline)
         might be efficient).

docs/dev-naming.html

@@ -14,6 +14,7 @@
 
 <div id="filing">Filed under Development</div>
 <div id="index">Return to the <a href="index.html">index</a>.</div>
+<div id="home"><a href="http://hp.jpsband.org/">HTML Purifier</a> End-User Documentation</div>
 
 <p>The classes in this library follow a few naming conventions, which may
 help you find the correct functionality more quickly.  Here they are:</p>
@@ -54,8 +55,9 @@ help you find the correct functionality more quickly.  Here they are:</p>
     abbreviated version is more readable than the full version. Here, we
     list common abbreviations:
     <ul>
-        <li>Attr(s) to Attribute(s)</li>
+        <li>Attr to Attributes (note that it is plural, i.e. <code>$attr = array()</code>)</li>
         <li>Def to Definition</li>
+        <li><code>$ret</code> is the value to be returned in a function</li>
     </ul>
     </dd>
 

docs/dev-optimization.html

@@ -14,6 +14,7 @@
 
 <div id="filing">Filed under Development</div>
 <div id="index">Return to the <a href="index.html">index</a>.</div>
+<div id="home"><a href="http://hp.jpsband.org/">HTML Purifier</a> End-User Documentation</div>
 
 <p>Here are some possible optimization techniques we can apply to code sections if
 they turn out to be slow.  Be sure not to prematurely optimize: if you get

docs/dev-progress.html

@@ -32,6 +32,7 @@ thead th {text-align:left;padding:0.1em;background-color:#EEE;}
 
 <div id="filing">Filed under Development</div>
 <div id="index">Return to the <a href="index.html">index</a>.</div>
+<div id="home"><a href="http://hp.jpsband.org/">HTML Purifier</a> End-User Documentation</div>
 
 <h2>Key</h2>
 
@@ -59,7 +60,7 @@ thead th {text-align:left;padding:0.1em;background-color:#EEE;}
 <tbody>
 <tr><th colspan="2">Standard</th></tr>
 <tr class="css1 impl-yes"><td>background-color</td><td>COMPOSITE(&lt;color&gt;, transparent)</td></tr>
-<tr class="css1 impl-yes"><td>background</td><td>SHORTHAND, only for color, see below for info on background-image and friends</td></tr>
+<tr class="css1 impl-yes"><td>background</td><td>SHORTHAND, currently alias for background-color</td></tr>
 <tr class="css1 impl-yes"><td>border</td><td>SHORTHAND, MULTIPLE</td></tr>
 <tr class="css1 impl-yes"><td>border-color</td><td>MULTIPLE</td></tr>
 <tr class="css1 impl-yes"><td>border-style</td><td>MULTIPLE</td></tr>
@@ -128,29 +129,30 @@ thead th {text-align:left;padding:0.1em;background-color:#EEE;}
 
 <tbody>
 <tr><th colspan="2">Absolute positioning, unknown release milestone</th></tr>
-<tr class="danger"><td>bottom</td><td rowspan="4">Dangerous, must be non-negative</td></tr>
-<tr class="danger"><td>left</td></tr>
-<tr class="danger"><td>right</td></tr>
-<tr class="danger"><td>top</td></tr>
-<tr><td>clip</td><td>-</td></tr>
-<tr class="danger"><td>position</td><td>ENUM(static, relative, absolute, fixed), permit
+<tr class="danger impl-no"><td>bottom</td><td rowspan="4">Dangerous, must be non-negative to even be considered,
+    but it's still possible to arbitrarily position by running over.</td></tr>
+<tr class="danger impl-no"><td>left</td></tr>
+<tr class="danger impl-no"><td>right</td></tr>
+<tr class="danger impl-no"><td>top</td></tr>
+<tr class="impl-no"><td>clip</td><td>-</td></tr>
+<tr class="danger impl-no"><td>position</td><td>ENUM(static, relative, absolute, fixed)
     relative not absolute?</td></tr>
-<tr class="danger"><td>z-index</td><td>Dangerous</td></tr>
+<tr class="danger impl-no"><td>z-index</td><td>Dangerous</td></tr>
 </tbody>
 
 <tbody>
 <tr><th colspan="2">Unknown</th></tr>
-<tr class="danger css1"><td>background-image</td><td>Dangerous, target milestone 1.2</td></tr>
-<tr class="css1"><td>background-attachment</td><td>ENUM(scroll, fixed),
+<tr class="danger css1 impl-yes"><td>background-image</td><td>Dangerous, target milestone 1.3</td></tr>
+<tr class="css1 impl-yes"><td>background-attachment</td><td>ENUM(scroll, fixed),
     Depends on background-image</td></tr>
-<tr class="css1"><td>background-position</td><td>Depends on background-image</td></tr>
+<tr class="css1 impl-yes"><td>background-position</td><td>Depends on background-image</td></tr>
 <tr class="danger impl-no"><td>cursor</td><td>Dangerous but fluffy</td></tr>
 <tr class="danger css1"><td>display</td><td>ENUM(...), Dangerous but interesting;
     will not implement list-item, run-in (Opera only) or table (no IE);
     inline-block has incomplete IE6 support and requires -moz-inline-box
     for Mozilla. Unknown target milestone.</td></tr>
-<tr><td class="css1">height</td><td>Interesting, why use it? Unknown target milestone.</td></tr>
-<tr class="danger css1"><td>list-style-image</td><td>Dangerous? Target milestone 1.2</td></tr>
+<tr class="css1"><td>height</td><td>Interesting, why use it? Unknown target milestone.</td></tr>
+<tr class="danger css1 impl-yes"><td>list-style-image</td><td>Dangerous?</td></tr>
 <tr class="impl-no"><td>max-height</td><td rowspan="4">No IE 5/6</td></tr>
 <tr class="impl-no"><td>min-height</td></tr>
 <tr class="impl-no"><td>max-width</td></tr>
@@ -229,14 +231,14 @@ Mozilla on inside and needs -moz-outline, no IE support.</td></tr>
 
 <tbody>
 <tr><th colspan="3">CSS</th></tr>
-<tr class="impl-yes"><td>style</td><td>All</td><td>Not all properties may be implemented, parser is good though.</td></tr>
+<tr class="impl-yes"><td>style</td><td>All</td><td>Parser is reasonably functional. Status here doesn't count individual properties.</td></tr>
 </tbody>
 
 <tbody>
 <tr><th colspan="3">Questionable</th></tr>
 <tr class="impl-no"><td>accesskey</td><td>A</td><td>May interfere with main interface</td></tr>
 <tr class="impl-no"><td>tabindex</td><td>A</td><td>May interfere with main interface</td></tr>
-<tr><td>target</td><td>A</td><td>Config enabled, only useful for frame layouts</td></tr>
+<tr><td>target</td><td>A</td><td>Config enabled, only useful for frame layouts, disallowed in strict</td></tr>
 </tbody>
 
 <tbody>
@@ -264,13 +266,13 @@ Mozilla on inside and needs -moz-outline, no IE support.</td></tr>
 <tr><td rowspan="5">align</td><td>CAPTION</td><td>Near-equiv style 'caption-side', drop left and right</td></tr>
     <tr><td>IMG</td><td rowspan="2">Margin-left and margin-right = auto or parent div</td></tr>
     <tr><td>TABLE</td></tr>
-    <tr><td>HR</td><td>Equivalent style 'text-align' (IE tested)</td></tr>
+    <tr><td>HR</td><td>Near-equivalent style 'text-align' (Works for IE and Opera, but not Firefox). Also try <code>margin-right:auto; margin-left:0;</code> for left or <code>margin-right:0; margin-left:auto;</code> for right (optionally replacing 0 with the original margin for that side)</td></tr>
     <tr class="impl-yes"><td>H1, H2, H3, H4, H5, H6, P</td><td>Equivalent style 'text-align'</td></tr>
 <tr class="required impl-yes"><td>alt</td><td>IMG</td><td>Required, insert image filename if src is present or default invalid image text</td></tr>
-<tr><td rowspan="3">bgcolor</td><td>TABLE</td><td>Equivalent style 'background-color' (IE tested)</td></tr>
-    <tr><td>TR</td><td>Equivalent style 'background-color' (IE tested)</td></tr>
+<tr><td rowspan="3">bgcolor</td><td>TABLE</td><td>Equivalent style 'background-color'</td></tr>
+    <tr><td>TR</td><td>Equivalent style 'background-color'</td></tr>
     <tr><td>TD, TH</td><td>Equivalent style 'background-color'</td></tr>
-<tr><td>border</td><td>IMG</td><td>Equivalent style 'border-width', only applies when link present</td></tr>
+<tr><td>border</td><td>IMG</td><td>Near equivalent style 'border-width', as it only applies when link present</td></tr>
 <tr><td>clear</td><td>BR</td><td>Near-equiv style 'clear', transform 'all' into 'both'</td></tr>
 <tr class="impl-no"><td>compact</td><td>DL, OL, UL</td><td>Boolean, needs custom CSS class; rarely used anyway</td></tr>
 <tr class="required impl-yes"><td>dir</td><td>BDO</td><td>Required, insert ltr (or configuration value) if none</td></tr>
@@ -283,11 +285,11 @@ Mozilla on inside and needs -moz-outline, no IE support.</td></tr>
 <tr><td>nowrap</td><td>TD, TH</td><td>Boolean, style 'white-space:nowrap;' (not compat with IE5)</td></tr>
 <tr><td>size</td><td>HR</td><td>Near-equiv 'width', needs px suffix if original was pixels</td></tr>
 <tr class="required impl-yes"><td>src</td><td>IMG</td><td>Required, insert blank or default img if not set</td></tr>
-<tr><td>start</td><td>OL</td><td>Poorly supported 'counter-reset', transform may not be desirable</td></tr>
+<tr class="impl-yes"><td>start</td><td>OL</td><td>Poorly supported 'counter-reset', allowed in loose, dropped in strict</td></tr>
 <tr><td rowspan="3">type</td><td>LI</td><td rowspan="3">Equivalent style 'list-style-type', different allowed values though. (needs testing)</td></tr>
     <tr><td>OL</td></tr>
     <tr><td>UL</td></tr>
-<tr><td>value</td><td>LI</td><td>Poorly supported 'counter-reset', transform may not be desirable, see ol.start. Configurable.</td></tr>
+<tr class="impl-yes"><td>value</td><td>LI</td><td>Poorly supported 'counter-reset', allowed in loose, dropped in strict</td></tr>
 <tr><td>vspace</td><td>IMG</td><td>Near-equiv styles 'margin-left' and 'margin-right', needs px suffix, see hspace</td></tr>
 <tr><td rowspan="2">width</td><td>HR</td><td rowspan="2">Near-equiv style 'width', needs px suffix if original was pixels</td></tr>
     <tr><td>TD, TH</td></tr>

docs/enduser-id.html

@@ -15,6 +15,7 @@
 
 <div id="filing">Filed under End-User</div>
 <div id="index">Return to the <a href="index.html">index</a>.</div>
+<div id="home"><a href="http://hp.jpsband.org/">HTML Purifier</a> End-User Documentation</div>
 
 <p>Prior to HTML Purifier 1.2.0, this library blithely accepted user input that
 looked like this:</p>

docs/enduser-overview.txt

@@ -36,7 +36,7 @@ forgiving lexer.  You may also be interested in the unit tests located in the
 tests/ folder, which provide a living document on how exactly the filter deals
 with malformed input.
 
-In summary:
+In summary (see corresponding classes for more details):
 
 1. Parse document into an array of tag and text tokens (Lexer)
 2. Remove all elements not on whitelist and transform certain other elements

docs/enduser-security.txt

@@ -6,43 +6,17 @@ through negligence of people. This class will do its job: no more, no less,
 and it's up to you to provide it the proper information and proper context
 to be effective. Things to remember:
 
-1. Character Encoding: UTF-8.
-Currently, the parser runs under the assumption that it is dealing
-with UTF-8. Not ISO-8859-1 or Windows-1252, UTF-8. And definitely not "no
-character encoding explicitly stated" or UTF-7. If you're not using UTF-8 as
-your character encoding, make sure you configure HTML Purifier or switch
-to UTF-8. Now. Also, make sure any input is properly converted to UTF-8, or
-the parser will mangle it badly (though it won't be a security risk if you're
-outputting it as UTF-8 though).  Character encoding is, in general, a knotty
-issue, but do yourself a favor and learn about it:
-<http://www.joelonsoftware.com/articles/Unicode.html>
+1. Character Encoding: see enduser-utf8.html for more info.
 
-2. Doctype: XHTML 1.0 Transitional
-This is what the parser is outputting. For the most
-part, it's compatible with HTML 4.01, but XHTML enforces some very nice things
-that all web developers should use. Regardless, NO DOCTYPE is a NO. Quirks mode
-has waaaay too many quirks for a little parser to handle.  We did not select
-strict in order to prevent ourselves from being too draconic on users, but
-this may be configurable in the future.  Do you want standards compliance?
-The doctype is a good place to start.
+2. Doctype: document pending feature completion
+Not strictly necessary, actually. More in-depth discussion once we figure
+out how to get strict loose mode working.
 
-3. IDs
-They need to be unique, but without some knowledge of the
-rest of the document, it's difficult to know what's unique. %Attr.IDBlacklist
-needs to be set: we may want to consider disallowing IDs by default to
-save lazy programmers.
+3. IDs: see enduser-id.html for more info
 
-4. [PROJECTED] Links
-We're not going to try for spam protection (although
-some hooks for such a module might be nice) but we may offer the ability to
-only accept relative URLs. Pick the one that's right for you.
+4. Links: document pending feature completion
+Rudimentary blacklisting, we should also allow only relative URIs. We
+need a doc to explain the stuff.
 
-5. CSS
-While we can prevent the most flagrant cases from affecting your
-layout (such as absolutely positioned elements), no amount of code is going
-to protect your pages from being attacked by garish colors and plain old
-bad taste.  A neat feature would be the ability to define acceptable colors
-in a document, but that's not likely to be implemented for a while.  In the
-meantime, be sure to make sure that floated elements (permitted, since they
-can be quite useful) can't mess up your layout. Once again, we may want to
-disable this by default to protect lazy developers.
+5. CSS: document pending
+Explain which CSS styles we blocked and why.

docs/enduser-slow.html

@@ -0,0 +1,117 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+<meta name="description" content="Explains how to speed up HTML Purifier through caching or inbound filtering." />
+<link rel="stylesheet" type="text/css" href="./style.css" />
+
+<title>Speeding up HTML Purifier - HTML Purifier</title>
+
+</head><body>
+
+<h1 class="subtitled">Speeding up HTML Purifier</h1>
+<div class="subtitle">...also known as the HELP ME LIBRARY IS TOO SLOW MY PAGE TAKE TOO LONG page</div>
+
+<div id="filing">Filed under End-User</div>
+<div id="index">Return to the <a href="index.html">index</a>.</div>
+<div id="home"><a href="http://hp.jpsband.org/">HTML Purifier</a> End-User Documentation</div>
+
+<p>HTML Purifier is a very powerful library. But with power comes great 
+responsibility, in the form of longer execution times.  Remember, this 
+library isn't lightly grazing over submitted HTML: it's deconstructing 
+the whole thing, rigorously checking the parts, and then putting it back 
+together. </p>
+
+<p>So, if it so turns out that HTML Purifier is kinda too slow for outbound 
+filtering, you've got a few options: </p>
+
+<h2>Inbound filtering</h2>
+
+<p>Perform filtering of HTML when it's submitted by the user. Since the 
+user is already submitting something, an extra half a second tacked on 
+to the load time probably isn't going to be that huge of a problem.  
+Then, displaying the content is a simple a manner of outputting it 
+directly from your database/filesystem. The trouble with this method is 
+that your user loses the original text, and when doing edits, will be 
+handling the filtered text.  While this may be a good thing, especially 
+if you're using a WYSIWYG editor, it can also result in data-loss if a 
+user makes a typo. </p>
+
+<p>Example (non-functional):</p>
+
+<pre>&lt;?php
+    /**
+     * FORM SUBMISSION PAGE
+     * display_error($message) : displays nice error page with message
+     * display_success() : displays a nice success page
+     * display_form() : displays the HTML submission form
+     * database_insert($html) : inserts data into database as new row
+     */
+    if (!empty($_POST)) {
+        require_once '/path/to/library/HTMLPurifier.auto.php';
+        require_once 'HTMLPurifier.func.php';
+        $dirty_html = isset($_POST['html']) ? $_POST['html'] : false;
+        if (!$dirty_html) {
+            display_error('You must write some HTML!');
+        }
+        $html = HTMLPurifier($dirty_html);
+        database_insert($html);
+        display_success();
+        // notice that $dirty_html is *not* saved
+    } else {
+        display_form();
+    }
+?&gt;</pre>
+
+<h2>Caching the filtered output</h2>
+
+<p>Accept the submitted text and put it unaltered into the database, but 
+then also generate a filtered version and stash that in the database.  
+Serve the filtered version to readers, and the unaltered version to 
+editors.  If need be, you can invalidate the cache and have the cached 
+filtered version be regenerated on the first page view.  Pros? Full data 
+retention. Cons? It's more complicated, and opens other editors up to 
+XSS if they are using a WYSIWYG editor (to fix that, they'd have to be 
+able to get their hands on the *really* original text served in 
+plaintext mode). </p>
+
+<p>Example (non-functional):</p>
+
+<pre>&lt;?php
+    /**
+     * VIEW PAGE
+     * display_error($message) : displays nice error page with message
+     * cache_get($id) : retrieves HTML from fast cache (db or file)
+     * cache_insert($id, $html) : inserts good HTML into cache system
+     * database_get($id) : retrieves raw HTML from database
+     */
+    $id = isset($_GET['id']) ? (int) $_GET['id'] : false;
+    if (!$id) {
+        display_error('Must specify ID.');
+        exit;
+    }
+    $html = cache_get($id); // filesystem or database
+    if ($html === false) {
+        // cache didn't have the HTML, generate it
+        $raw_html = database_get($id);
+        require_once '/path/to/library/HTMLPurifier.auto.php';
+        require_once 'HTMLPurifier.func.php';
+        $html = HTMLPurifier($raw_html);
+        cache_insert($id, $html);
+    }
+    echo $html;
+?&gt;</pre>
+
+<h2>Summary</h2>
+
+<p>In short, inbound filtering is the simple option and caching is the
+robust option (albeit with bigger storage requirements). </p>
+
+<p>There is a third option, independent of the two we've discussed: profile 
+and optimize HTMLPurifier yourself. Be sure to report back your results 
+if you decide to do that! Especially if you port HTML Purifier to C++. 
+<tt>;-)</tt></p>
+
+</body>
+</html>

docs/enduser-youtube.html

@@ -0,0 +1,152 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+<meta name="description" content="Explains how to safely allow the embedding of flash from trusted sites in HTML Purifier." />
+<link rel="stylesheet" type="text/css" href="./style.css" />
+
+<title>Embedding YouTube Videos - HTML Purifier</title>
+
+</head><body>
+
+<h1 class="subtitled">Embedding YouTube Videos</h1>
+<div class="subtitle">...as well as other dangerous active content</div>
+
+<div id="filing">Filed under End-User</div>
+<div id="index">Return to the <a href="index.html">index</a>.</div>
+<div id="home"><a href="http://hp.jpsband.org/">HTML Purifier</a> End-User Documentation</div>
+
+<p>Clients like their YouTube videos. It gives them a warm fuzzy feeling when
+they see a neat little embedded video player on their websites that can play
+the latest clips from their documentary &quot;Fido and the Bones of Spring&quot;.
+All joking aside, the ability to embed YouTube videos or other active
+content in their pages is something that a lot of people like.</p>
+
+<p>This is a <em>bad</em> idea. The moment you embed anything untrusted,
+you will definitely be slammed by a manner of nasties that can be
+embedded in things from your run of the mill Flash movie to
+<a href="http://blog.spywareguide.com/2006/12/myspace_phish_attack_leads_use.html">Quicktime movies</a>.
+Even <code>img</code> tags, which HTML Purifier allows by default, can be
+dangerous. Be distrustful of anything that tells a browser to load content
+from another website automatically.</p>
+
+<p>Luckily for us, however, whitelisting saves the day. Sure, letting users
+include any old random flash file could be dangerous, but if it's
+from a specific website, it probably is okay. If no amount of pleading will
+convince the people upstairs that they should just settle with just linking
+to their movies, you may find this technique very useful.</p>
+
+<h2>Looking in</h2>
+
+<p>Below is custom code that allows users to embed
+YouTube videos. This is not favoritism: this trick can easily be adapted for
+other forms of embeddable content.</p>
+
+<p>Usually, websites like YouTube give us boilerplate code that you can insert
+into your documents. YouTube's code goes like this:</p>
+
+<pre>
+&lt;object width=&quot;425&quot; height=&quot;350&quot;&gt;
+  &lt;param name=&quot;movie&quot; value=&quot;http://www.youtube.com/v/AyPzM5WK8ys&quot; /&gt;
+  &lt;param name=&quot;wmode&quot; value=&quot;transparent&quot; /&gt;
+  &lt;embed src=&quot;http://www.youtube.com/v/AyPzM5WK8ys&quot;
+         type=&quot;application/x-shockwave-flash&quot;
+         wmode=&quot;transparent&quot; width=&quot;425&quot; height=&quot;350&quot; /&gt;
+&lt;/object&gt;
+</pre>
+
+<p>There are two things to note about this code:</p>
+
+<ol>
+    <li><code>&lt;embed&gt;</code> is not recognized by W3C, so if you want
+        standards-compliant code, you'll have to get rid of it.</li>
+    <li>The code is exactly the same for all instances, except for the
+        identifier <tt>AyPzM5WK8ys</tt> which tells us which movie file
+        to retrieve.</li>
+</ol>
+
+<p>What point 2 means is that if we have code like <code>&lt;span
+class=&quot;embed-youtube&quot;&gt;AyPzM5WK8ys&lt;/span&gt;</code> your
+application can reconstruct the full object from this small snippet that
+passes through HTML Purifier <em>unharmed</em>.
+<a href="http://hp.jpsband.org/svnroot/htmlpurifier/trunk/library/HTMLPurifier/Filter/YouTube.php">Show me the code!</a></p>
+
+<p>And the corresponding usage:</p>
+
+<pre>&lt;?php
+    // assuming $purifier is an instance of HTMLPurifier
+    require_once 'HTMLPurifier/Filter/YouTube.php';
+    $purifier-&gt;addFilter(new HTMLPurifier_Filter_YouTube());
+?&gt;</pre>
+
+<p>There is a bit going in the two code snippets, so let's explain.</p>
+
+<ol>
+    <li>This is a Filter object, which intercepts the HTML that is
+        coming into and out of the purifier. You can add as many
+        filter objects as you like. <code>preFilter()</code>
+        processes the code before it gets purified, and <code>postFilter()</code>
+        processes the code afterwards. So, we'll use <code>preFilter()</code> to
+        replace the object tag with a <code>span</code>, and <code>postFilter()</code>
+        to restore it.</li>
+    <li>The first preg_replace call replaces any YouTube code users may have
+        embedded into the benign span tag. Span is used because it is inline,
+        and objects are inline too. We are very careful to be extremely
+        restrictive on what goes inside the span tag, as if an errant code
+        gets in there it could get messy.</li>
+    <li>The HTML is then purified as usual.</li>
+    <li>Then, another preg_replace replaces the span tag with a fully fledged
+        object. Note that the embed is removed, and, in its place, a data
+        attribute was added to the object. This makes the tag standards
+        compliant! It also breaks Internet Explorer, so we add in a bit of
+        conditional comments with the old embed code to make it work again.
+        It's all quite convoluted but works.</li>
+</ol>
+
+<h2>Warning</h2>
+
+<p>There are a number of possible problems with the code above, depending
+on how you look at it.</p>
+
+<h3>Cannot change width and height</h3>
+
+<p>The width and height of the final YouTube movie cannot be adjusted. This
+is because I am lazy. If you really insist on letting users change the size
+of the movie, what you need to do is package up the attributes inside the
+span tag (along with the movie ID). It gets complicated though: a malicious
+user can specify an outrageously large height and width and attempt to crash
+the user's operating system/browser. You need to either cap it by limiting
+the amount of digits allowed in the regex or using a callback to check the
+number.</p>
+
+<h3>Trusts media's host's security</h3>
+
+<p>By allowing this code onto our website, we are trusting that YouTube has
+tech-savvy enough people not to allow their users to inject malicious
+code into the Flash files.  An exploit on YouTube means an exploit on your
+site.  Even though YouTube is run by the reputable Google, it
+<a href="http://ha.ckers.org/blog/20061213/google-xss-vuln/">doesn't</a>
+mean they are
+<a href="http://ha.ckers.org/blog/20061208/xss-in-googles-orkut/">invulnerable.</a>
+You're putting a certain measure of the job on an external provider (just as
+you have by entrusting your user input to HTML Purifier), and
+it is important that you are cognizant of the risk.</p>
+
+<h3>Poorly written adaptations compromise security</h3>
+
+<p>This should go without saying, but if you're going to adapt this code
+for Google Video or the like, make sure you do it <em>right</em>. It's
+extremely easy to allow a character too many in <code>postFilter()</code> and
+suddenly you're introducing XSS into HTML Purifier's XSS free output. HTML
+Purifier may be well written, but it cannot guard against vulnerabilities
+introduced after it has finished.</p>
+
+<h2>Help out!</h2>
+
+<p>If you write a filter for your favorite video destination (or anything
+like that, for that matter), send it over and it might get included
+with the core!</p>
+
+</body>
+</html>

docs/examples/basic.php

@@ -1,15 +1,14 @@
-<?php
+<?php exit;
 
 // This file demonstrates basic usage of HTMLPurifier.
 
-exit; // not to be called directly, it will fail fantastically!
-
-set_include_path('/path/to/htmlpurifier/library' . PATH_SEPARATOR . get_include_path());
-require_once 'HTMLPurifier.php';
+require_once '/path/to/htmlpurifier/library/HTMLPurifier.auto.php';
 
 $purifier = new HTMLPurifier();
 $html = '<b>Simple and short';
 
 $pure_html = $purifier->purify($html);
 
+echo $pure_html;
+
 ?>

docs/examples/demo.php

@@ -1,34 +1,66 @@
 <?php
 
-header('Content-type:text/html;charset=UTF-8');
+// using _REQUEST because we accept GET and POST requests
 
-?><!DOCTYPE html 
-     PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+$content = empty($_REQUEST['xml']) ? 'text/html' : 'application/xhtml+xml';
+header("Content-type:$content;charset=UTF-8");
+
+// prevent PHP versions with shorttags from barfing
+echo '<?xml version="1.0" encoding="UTF-8" ?>
+';
+
+function getFormMethod() {
+    return (isset($_REQUEST['post'])) ? 'post' : 'get';
+}
+
+if (empty($_REQUEST['strict'])) {
+?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html>
+<?php
+} else {
+?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<?php
+}
+?>
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
 <head>
-<title>HTMLPurifier Live Demo</title>
+<title>HTML Purifier Live Demo</title>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
 </head>
 <body>
-<h1>HTMLPurifier Live Demo</h1>
+<h1>HTML Purifier Live Demo</h1>
 <?php
 
-set_include_path('../../library' . PATH_SEPARATOR . get_include_path());
-require_once 'HTMLPurifier.php';
+require_once '../../library/HTMLPurifier.auto.php';
 
-if (!empty($_POST['html'])) {
+if (!empty($_REQUEST['html'])) { // start result
     
-    $html = get_magic_quotes_gpc() ? stripslashes($_POST['html']) : $_POST['html'];
+    if (strlen($_REQUEST['html']) > 50000) {
+        ?>
+        <p>Request exceeds maximum allowed text size of 50kb.</p>
+        <?php
+    } else { // start main processing
+    
+    $html = get_magic_quotes_gpc() ? stripslashes($_REQUEST['html']) : $_REQUEST['html'];
     
     $config = HTMLPurifier_Config::createDefault();
-    $config->set('Core', 'TidyFormat', !empty($_POST['tidy']));
+    $config->set('Core', 'TidyFormat', !empty($_REQUEST['tidy']));
+    $config->set('HTML', 'Strict',     !empty($_REQUEST['strict']));
     $purifier = new HTMLPurifier($config);
     $pure_html = $purifier->purify($html);
     
 ?>
 <p>Here is your purified HTML:</p>
 <div style="border:5px solid #CCC;margin:0 10%;padding:1em;">
+<?php if(getFormMethod() == 'get') { ?>
+<div style="float:right;">
+    <a href="http://validator.w3.org/check?uri=referer"><img
+        src="http://www.w3.org/Icons/valid-xhtml10"
+        alt="Valid XHTML 1.0 Transitional" height="31" width="88" style="border:0;" /></a>
+</div>
+<?php } ?>
 <?php
 
 echo $pure_html;
@@ -43,23 +75,34 @@ echo htmlspecialchars($pure_html, ENT_COMPAT, 'UTF-8');
 
 ?></pre>
 <?php
-    
+if (getFormMethod() == 'post') { // start POST validation notice
+?>
+<p>If you would like to validate the code with
+<a href="http://validator.w3.org/#validate-by-input">W3C's
+validator</a>, copy and paste the <em>entire</em> demo page's source.</p>
+<?php
+} // end POST validation notice
+
+} // end main processing
+
+// end result
 } else {
 
 ?>
-<p>Welcome to the live demo.  Enter some HTML and see how HTMLPurifier
+<p>Welcome to the live demo.  Enter some HTML and see how HTML Purifier
 will filter it.</p>
 <?php
 
 }
 
 ?>
-<form name="filter" action="demo.php<?php
-if (isset($_GET['profile']) || isset($_GET['XDEBUG_PROFILE'])) {
-    echo '?XDEBUG_PROFILE=1';
-} ?>" method="post">
+<form id="filter" action="demo.php<?php
+echo '?' . getFormMethod();
+if (isset($_REQUEST['profile']) || isset($_REQUEST['XDEBUG_PROFILE'])) {
+    echo '&amp;XDEBUG_PROFILE=1';
+} ?>" method="<?php echo getFormMethod();  ?>">
     <fieldset>
-        <legend>HTML</legend>
+        <legend>HTML Purifier Input (<?php echo getFormMethod(); ?>)</legend>
         <textarea name="html" cols="60" rows="15"><?php
 
 if (isset($html)) {
@@ -67,13 +110,27 @@ if (isset($html)) {
             HTMLPurifier_Encoder::cleanUTF8($html), ENT_COMPAT, 'UTF-8');
 }
         ?></textarea>
-        <div>Nicely format output with Tidy? <input type="checkbox" value="1"
-        name="tidy"<?php if (!empty($_POST['tidy'])) echo ' checked="checked"'; ?> /></div>
+        <?php if (getFormMethod() == 'get') { ?>
+            <p><strong>Warning:</strong> GET request method can only hold
+                8129 characters (probably less depending on your browser).
+                If you need to test anything
+                larger than that, try the <a href="demo.php?post">POST form</a>.</p>
+        <?php } ?>
+        <?php if (extension_loaded('tidy')) { ?>
+            <div>Nicely format output with Tidy? <input type="checkbox" value="1"
+            name="tidy"<?php if (!empty($_REQUEST['tidy'])) echo ' checked="checked"'; ?> /></div>
+        <?php } ?>
+        <div>XHTML 1.0 Strict output? <input type="checkbox" value="1"
+        name="strict"<?php if (!empty($_REQUEST['strict'])) echo ' checked="checked"'; ?> /></div>
+        <div>Serve as application/xhtml+xml? (not for IE) <input type="checkbox" value="1"
+        name="xml"<?php if (!empty($_REQUEST['xml'])) echo ' checked="checked"'; ?> /></div>
         <div>
             <input type="submit" value="Submit" name="submit" class="button" />
         </div>
     </fieldset>
 </form>
-<p>Return to <a href="http://hp.jpsband.org/">HTMLPurifier's home page</a>.</p>
+<p>Return to <a href="http://hp.jpsband.org/">HTML Purifier's home page</a>.
+Try the form in <a href="demo.php?get">GET</a> and <a href="demo.php?post">POST</a> request
+flavors (GET is easy to validate with W3C, but POST allows larger inputs).</p>
 </body>
 </html>

docs/fixquotes.htc

@@ -0,0 +1,6 @@
+<public:attach event="oncontentready" onevent="init();" />
+<script>
+function init() {
+  element.innerHTML = '&#8220;'+element.innerHTML+'&#8221;';
+}
+</script>

docs/index.html

@@ -13,7 +13,7 @@
 
 <h1>Documentation</h1>
 
-<p><strong>HTML Purifier</strong> has documentation for all types of people.
+<p><strong><a href="http://hp.jpsband.org/">HTML Purifier</a></strong> has documentation for all types of people.
 Here is an index of all of them.</p>
 
 <h2>End-user</h2>
@@ -23,7 +23,16 @@ information for casual developers using HTML Purifier.</p>
 <dl>
 
 <dt><a href="enduser-id.html">IDs</a></dt>
-<dd>Explains various methods for allowing IDs in documents safely in HTML Purifier.</dd>
+<dd>Explains various methods for allowing IDs in documents safely.</dd>
+
+<dt><a href="enduser-youtube.html">Embedding YouTube videos</a></dt>
+<dd>Explains how to safely allow the embedding of flash from trusted sites.</dd>
+
+<dt><a href="enduser-slow.html">Speeding up HTML Purifier</a></dt>
+<dd>Explains how to speed up HTML Purifier through caching or inbound filtering.</dd>
+
+<dt><a href="enduser-utf8.html">UTF-8: The Secret of Character Encoding</a></dt>
+<dd>Describes the rationale for using UTF-8, the ramifications otherwise, and how to make the switch.</dd>
 
 </dl>
 
@@ -45,6 +54,10 @@ conventions.</p>
 <dt><a href="dev-optimization.html">Optimization</a></dt>
 <dd>Discusses possible methods of optimizing HTML Purifier.</dd>
 
+<dt><a href="dev-advanced-api.html">Advanced API</a></dt>
+<dd>Functional specification for HTML Purifier's advanced API for defining
+custom filtering behavior.</dd>
+
 </dl>
 
 <h2>Proposals</h2>
@@ -65,6 +78,85 @@ that may not directly discuss HTML Purifier.</p>
 <dd>Credits and links to DevNetwork forum topics.</dd>
 </dl>
 
+<h2>Internal memos</h2>
+
+<p>Plaintext documents that are more for use by active developers of
+the code. They may be upgraded to HTML files or stay as TXT scratchpads.</p>
+
+<table class="table">
+
+<thead><tr>
+    <th width="10%">Type</th>
+    <th width="20%">Name</th>
+    <th>Description</th>
+</tr></thead>
+
+<tbody>
+
+<tr>
+    <td>End-user</td>
+    <td><a href="enduser-overview.txt">Overview</a></td>
+    <td>High level overview of the general control flow (mostly obsolete).</td>
+</tr>
+
+<tr>
+    <td>End-user</td>
+    <td><a href="enduser-security.txt">Security</a></td>
+    <td>Common security issues that may still arise (half-baked).</td>
+</tr>
+
+<tr>
+    <td>Proposal</td>
+    <td><a href="proposal-filter-levels.txt">Filter levels</a></td>
+    <td>Outlines details of projected configurable level of filtering.</td>
+</tr>
+
+<tr>
+    <td>Proposal</td>
+    <td><a href="proposal-language.txt">Language</a></td>
+    <td>Specification of I18N for error messages derived from MediaWiki (half-baked).</td>
+</tr>
+
+<tr>
+    <td>Proposal</td>
+    <td><a href="proposal-new-directives.txt">New directives</a></td>
+    <td>Assorted configuration options that could be implemented.</td>
+</tr>
+
+<tr>
+    <td>Reference</td>
+    <td><a href="ref-loose-vs-strict.txt">Loose vs.Strict</a></td>
+    <td>Differences between HTML Strict and Transitional versions.</td>
+</tr>
+
+<tr>
+    <td>Reference</td>
+    <td><a href="ref-proprietary-tags.txt">Proprietary tags</a></td>
+    <td>List of vendor-specific tags we may want to transform to W3C compliant markup.</td>
+</tr>
+
+<tr>
+    <td>Reference</td>
+    <td><a href="ref-strictness.txt">Strictness</a></td>
+    <td>Short essay on how loose definition isn't really loose.</td>
+</tr>
+
+<tr>
+    <td>Reference</td>
+    <td><a href="ref-xhtml-1.1.txt">XHTML 1.1</a></td>
+    <td>What we'd have to do to support XHTML 1.1.</td>
+</tr>
+
+<tr>
+    <td>Reference</td>
+    <td><a href="ref-whatwg.txt">WHATWG</a></td>
+    <td>How WHATWG plays into what we need to do.</td>
+</tr>
+
+</tbody>
+
+</table>
+
 <div id="version">$Id$</div>
 </body>
 </html>

docs/proposal-colors.html

@@ -15,6 +15,7 @@
 
 <div id="filing">Filed under Proposals</div>
 <div id="index">Return to the <a href="index.html">index</a>.</div>
+<div id="home"><a href="http://hp.jpsband.org/">HTML Purifier</a> End-User Documentation</div>
 
 <p>Your website probably has a color-scheme.
 <span style="color:#090; background:#FFF;">Green on white</span>,

docs/proposal-config.txt

@@ -7,22 +7,22 @@ value is used for.  This means decentralized configuration declarations that
 are nevertheless error checking and a centralized configuration object.
 
 Directives are divided into namespaces, indicating the major portion of
-functionality they cover (although there may be overlaps.  Please consult
+functionality they cover (although there may be overlaps).  Please consult
 the documentation in ConfigDef for more information on these namespaces.
 
 Since configuration is dependant on context, internal classes require a
 configuration object to be passed as a parameter.  (They also require a
 Context object).
 
-In relation to HTMLDefinition and CSSDefinition, there is a special class
+In relation to HTMLDefinition and CSSDefinition, there could be a special class
 of directives that influence the *construction* of the Definition object.
-A standard call pattern would look like:
+A theoretical call pattern would look like:
 
 1. Client calls Config->getHTMLDefinition()
 2. Config calls HTMLDefinition->createNew(this)
 3. HTMLDefinition constructs itself with base configuration
-4. HTMLDefinition calls Config->get('HTMLDefinition')
-5. Config returns array of directives that later construction
+4. HTMLDefinition calls Config->get('HTML')
+5. Config returns array of directives
 6. HTMLDefinition performs operations and changes specified by directives
 7. HTMLPurifier returns constructed definition
 8. Config caches definition so it doesn't have to be generated again
@@ -33,3 +33,8 @@ custom copy, which OVERRIDES all directives.  Only the base, vanilla copy
 is the Singleton, the object actually interfaced with is a operated-upon
 clone of that object.  Also, if an update to the directives would update
 the definition, you'd have to force reconstruction.
+
+In practice, the pulling directives from the config object are
+solely need-based, and the flex points are littered throughout the
+setup() function.  Some sort of refactoring is likely in order. See
+ref-xhtml-1.1.txt for more info.

docs/proposal-filter-levels.txt

@@ -8,14 +8,17 @@ could go into this definition: the set of HTML good for blog entries is
 definitely too large for HTML that would be allowed in blog comments. Going
 from Transitional to Strict requires changes to the definition.
 
-However, allowing users to specify their own whitelists was an idea I
-rejected from the start.  Simply put, the typical programmer is too lazy
-to actually go through the trouble of investigating which tags, attributes
-and properties to allow.  HTMLDefinition makes a big part of what HTMLPurifier
-is.
+Allowing users to specify their own whitelists is one step (implemented, btw), 
+but I have doubts on only doing this. Simply put, the typical programmer is too 
+lazy to actually go through the trouble of investigating which tags, attributes 
+and properties to allow. HTMLDefinition makes a big part of what HTMLPurifier 
+is. 
 
 The idea, then, is to setup fundamentally different set of definitions, which
-can further be customized using simpler configuration options.
+can further be customized using simpler configuration options.  Alternatively,
+they could be implemented as configuration profiles, which simply load
+a set of recommended directives to acheive a desired affect (no simpler
+config options though).
 
 Here are some fuzzy levels you could set:
 
@@ -28,7 +31,7 @@ Here are some fuzzy levels you could set:
     to be useful)
 3. Pages - As permissive as possible without allowing XSS.  No protection
     against bad design sense, unfortunantely.  Suitable for wiki and page
-    environments.
+    environments. (probably what we have now)
 4. Lint - Accept everything in the spec, a Tidy wannabe. (This probably won't
     get implemented as it would require routines for things like <object>
     and friends to be implemented, which is a lot of work for not a lot of

docs/proposal-language.txt

@@ -1,42 +1,6 @@
 We are going to model our I18N/L10N off of MediaWiki's system.  Their's is
 obviously quite complicated, so we're going to simplify it a bit for our needs.
 
-== Structure ==
-
-First, you have a Language object.  This object contains all the localisable
-message strings, as well as other important language-specific settings and
-custom behavior (uppercasing, lowercasing, printing dates, formatting
-numbers, etc.)
-
-The object is constructed from two sources: subclassed versions of itself
-(classes) and Message files (messages).
-
-== General use ==
-
-You load a language object by calling the Language::factory() function. 
-This function the class file for the object (taking in account fallback 
-languages by using the fallback langauge's object but overloading the 
-language key) and returns that object. Nothing else happens.
-
-When a message/etc is requested, a lazy load initializor is called.  Now the
-real work starts.  We're first going to take the scenario that the language
-is not cached.  The system loads the Messages file by:
-
-    require( $filename );
-    $cache = compact( self::$mLocalisationKeys );	
-
-...where self::$mLocalisationKeys is the name of variables that could be used
-in the localization file. This lets you use things like:
-
-    $fallback = false;
-    $rtl = false;
-
-...and easily siphon them into arrays.
-
-Then, we load the $fallback language (if not set, English) to fill in the gaps in
-the messages.  There is specialized behavior for certain keys, as they can be
-mergeable maps, lists or alias lists (not sure what the last one is).
-
 == Caching ==
 
 MediaWiki has lots of caching mechanisms built in, which make the code somewhat

docs/proposal-new-directives.txt

@@ -4,8 +4,6 @@ Configuration Ideas
 Here are some theoretical configuration ideas that we could implement some
 time.  Note the naming convention: %Namespace.Directive
 
-%Attr.IDPrefix - prefix all ids with this
-
 %Attr.RewriteFragments - if there's %Attr.IDPrefix we may want to transparently
     rewrite the URLs we parse too.  However, we can only do it when it's a pure
     anchor link, so it's not foolproof
@@ -21,20 +19,11 @@ time.  Note the naming convention: %Namespace.Directive
 %Attr.MaxHeight - caps for width and height related checks.
     (the hack in Pixels for an image crashing attack could be replaced by this)
 
-%URI.Munge - will munge all external URIs to a different URI, which redirects
-    the user to the applicable page. A urlencoded version of the URI
-    will replace any instances of %s in the string. One possible
-    string is 'http://www.google.com/url?q=%s'. Useful for preventing
-    pagerank from being sent to other sites, but can also be used to
-    redirect to a splash page notifying user that they are leaving your
-    website.
-
 %URI.AddRelNofollow - will add rel="nofollow" to all links, preventing the
     spread of ill-gotten pagerank
 
 %URI.RelativeToAbsolute - transforms all relative URIs to absolute form
 
-%URI.HostBlacklist - strings that if found in the host of a URI are disallowed
 %URI.HostBlacklistRegex - regexes that if matching the host are disallowed
 %URI.HostWhitelist - domain names that are excluded from the host blacklist
 %URI.HostPolicy - determines whether or not its reject all and then whitelist
@@ -53,7 +42,3 @@ time.  Note the naming convention: %Namespace.Directive
     absolute DNS.  While this is actually the preferred method according to
     the RFC, most people opt to use a relative domain name relative to . (root).
 
-%URI.DisableExternalResources - disallow resource links (i.e. URIs that result
-    in immediate requests, such as src in IMG) to external websites
-
-%HTML.DisableImg - disables all images

docs/ref-devnetwork.html

@@ -15,6 +15,7 @@
 
 <div id="filing">Filed under Reference</div>
 <div id="index">Return to the <a href="index.html">index</a>.</div>
+<div id="home"><a href="http://hp.jpsband.org/">HTML Purifier</a> End-User Documentation</div>
 
 <p>Many thanks to the DevNetwork community for answering questions,
 theorizing about design, and offering encouragement during

docs/ref-loose-vs-strict.txt

@@ -0,0 +1,37 @@
+
+Loose versus Strict
+    Changes from one doctype to another
+
+There are changes.  Wow, how insightful.  Not everything changed is relevant
+to HTML Purifier, though, so let's take a look:
+
+== Major incompatibilities ==
+
+[done] BLOCKQUOTE changes from 'flow' to 'block'
+    current behavior: inline inner contents should not be nuked, block-ify as necessary
+[partially-done] U, S, STRIKE cut
+    current behavior: removed completely
+    projected behavior: replace with appropriate inline span + CSS
+[done] ADDRESS from potpourri to Inline (removes p tags)
+    current behavior: block tags silently dropped
+    ideal behavior: replace tags with something like <br>. (not high priority)
+
+== Things we can loosen up ==
+
+Tags DIR, MENU, CENTER, ISINDEX, FONT, BASEFONT? allowed in loose
+    current behavior: transform to strict-valid forms
+Attributes allowed in loose (see attribute transforms in 'dev-progress.html')
+    current behavior: projected to transform into strict-valid forms
+
+== Periphery issues ==
+
+A tag's attribute 'target' (for selecting frames) cut
+    current behavior: not allowed at all
+    projected behavior: use loose doctype if needed, needs valid values
+[done] OL/LI tag's attribute 'start'/'value' (for renumbering lists) cut
+    current behavior: no substitute, just delete when in strict, allow in loose
+Attribute 'name' deprecated in favor of 'id'
+    current behavior: dropped silently
+    projected behavior: create proper AttrTransform
+[done] PRE tag allows SUB/SUP? (strict dtd comment vs syntax, loose disallows)
+    current behavior: disallow as usual

docs/ref-proprietary-tags.txt

@@ -0,0 +1,22 @@
+
+Proprietary Tags
+    <nobr> and friends
+
+Here are some proprietary tags that W3C does not define but occasionally show
+up in the wild.  We have only included tags that would make sense in an
+HTML Purifier context.
+
+<align>, block element that aligns (extremely rare)
+<blackface>, inline that double-bolds text (extremely rare)
+<comment>, hidden comment for IE and WebTV
+<multicol cols=number gutter=pixels width=pixels>, multiple columns
+<nobr>, no linebreaks
+<spacer align=* type="vertical|horizontal|block">, whitespace in doc,
+    use width/height for block and size for vertical/horizontal (attributes)
+    (extremely rare)
+<wbr>, potential word break point: allows linebreaks. Only works in <nobr>
+
+<listing>, monospace pre-variant (extremely rare)
+<plaintext>, escapes all tags to the end of document
+<ruby> and friends, (more research needed, appears to be XHTML 1.1 markup)
+<xmp>, monospace, replace with pre

docs/ref-strictness.txt

@@ -2,8 +2,8 @@
 Is HTML Purifier Strict or Transitional?
     A little bit of helpful guidance
 
-Despite the fact that HTML Purifier professes only to support transitional
-HTML, it rejects a lot of attributes and elements that are actually, indeed,
+Despite the fact that HTML Purifier professes to support both transitional and
+strict HTML, it rejects a lot of attributes and elements that are actually, indeed,
 valid. You can investigate progress.html to find out precisely what we
 are doing to these *deprecated* attributes.
 
@@ -11,8 +11,8 @@ However, users have found that Strict HTML imposes some quite unreasonable
 restrictions on certain things. The start and value attributes in ol and
 li (respectively) perhaps are the most contested. There's is currently no
 widely supported browser method short of JavaScript that can replace these
-two deprecated elements. HTML Purifier does not currently support them, but
-it might behoove us to do so while our output is still transitional.
+two deprecated elements. It behooves us to allow these deprecated
+attributes when the output is transitional.
 
 Fortunantely, that's the only real bugger case. The others have near-perfect
 CSS equivalents, and were presentational anyway. However, the other question
@@ -22,4 +22,16 @@ whole point about CSS is to seperate styling from content, so inline styling
 doesn't solve that problem.
 
 It's an icky question, and we'll have to deal with it as more and more 
-transforms get implemented.
+transforms get implemented.  As of right now, however, we currently support
+these loose-only constructs in loose mode:
+
+- <ul start="1">, <li value="1"> attributes
+- <u>, <strike>, <s> tags
+- flow children in <blockquote>
+- mixed children in <address>
+
+The changed child definitions as well as the ul.start li.value are the most
+compelling reasons why loose should be used.  We may want offer disabling <u>,
+<strike> and <s> by themselves. We may also want to offer no pre-emptive
+deprecated conversions. This all must be unified.
+

docs/ref-whatwg.txt

@@ -0,0 +1,9 @@
+
+Web Hypertext Application Technology Working Group
+    WHATWG
+
+I don't think we need to worry about them.  Untrusted users shouldn't be
+submitting applications, eh?  But if some interesting attribute pops up in
+their spec, and might be worth supporting, stick it here.
+
+(none so far, as you can see)

docs/ref-xhtml-1.1.txt

@@ -0,0 +1,187 @@
+
+XHTML 1.1 and HTML Purifier
+
+Todo for XHTML 1.1 support <http://www.w3.org/TR/xhtml11/changes.html>
+1. Scratch lang entirely in favor of xml:lang
+2. Scratch name entirely in favor of id (partially-done)
+3. Support Ruby <http://www.w3.org/TR/2001/REC-ruby-20010531/>
+
+HTML Purifier uses the modularization of XHTML
+<http://www.w3.org/TR/xhtml-modularization/> to organize the internals
+of HTMLDefinition into a more manageable and extensible fashion. Rather
+than have one super-object, HTMLDefinition is split into HTMLModules,
+each of which are responsible for defining elements, their attributes,
+and other properties (for a more indepth coverage, see
+/library/HTMLPurifier/HTMLModule.php's docblock comments).
+
+The modules that W3C defines and we support are:
+
+    * 5.1. Attribute Collections (technically not a module
+    * 5.2. Core Modules
+          o 5.2.2. Text Module
+          o 5.2.3. Hypertext Module
+          o 5.2.4. List Module
+    * 5.4. Text Extension Modules
+          o 5.4.1. Presentation Module
+          o 5.4.2. Edit Module
+          o 5.4.3. Bi-directional Text Module
+    * 5.6. Table Modules
+          o 5.6.2. Tables Module
+    * 5.7. Image Module
+    * 5.18. Style Attribute Module
+
+Modules that we don't support but coul support are:
+
+    * 5.6. Table Modules
+          o 5.6.1. Basic Tables Module [?]
+    * 5.8. Client-side Image Map Module [?]
+    * 5.9. Server-side Image Map Module [?]
+    * 5.12. Target Module [?]
+    * 5.21. Name Identification Module [deprecated]
+    * 5.22. Legacy Module [deprecated]
+
+These modules will not be implemented due to their dangerousness or
+inapplicability as an XHTML fragment:
+
+    * 5.2. Core Modules
+          o 5.2.1. Structure Module
+    * 5.3. Applet Module
+    * 5.5. Forms Modules
+          o 5.5.1. Basic Forms Module
+          o 5.5.2. Forms Module
+    * 5.10. Object Module
+    * 5.11. Frames Module
+    * 5.13. Iframe Module
+    * 5.14. Intrinsic Events Module
+    * 5.15. Metainformation Module
+    * 5.16. Scripting Module
+    * 5.17. Style Sheet Module
+    * 5.19. Link Module
+    * 5.20. Base Module
+
+We will not be using W3C's XML Schemas or DTDs directly due to the lack
+of robust tools for handling them (the main problem is that all the
+current parsers are usually PHP 5 only and solely-validating, not
+correcting).
+
+The abstraction of the HTMLDefinition creation process will also
+contribute to a need for a caching system. Cache invalidation would be
+difficult, but could be done by comparing the HTML and Attr config
+namespaces with a copy that was packaged along with the serialized
+HTMLDefinition object.
+
+== General Use-Case ==
+
+The outwards API of HTMLDefinition has been largely preserved, not
+only for backwards-compatibility but also by design. Instead,
+HTMLDefinition can be retrieved "raw", in which it loads a structure
+that closely resembles the modules of XHTML 1.1. This structure is very
+dynamic, making it easy to make cascading changes to global content
+sets or remove elements in bulk.
+
+However, once HTML Purifier needs the actual definition, it retrieves
+a finalized version of HTMLDefinition. The finalized definition involves
+processing the modules into a form that it is optimized for multiple
+calls. This final version is immutable and, even if editable, would
+be extremely hard to change.
+
+So, some code taking advantage of the XHTML modularization may look
+like this:
+
+<?php
+    $config = HTMLPurifier_Config::createDefault();
+    $def =& $config->getHTMLDefinition(true); // reference to raw
+    unset($def->modules['Hypertext']); // rm ''a'' link
+    $purifier = new HTMLPurifier($config);
+    $purifier->purify($html); // now the definition is finalized
+?>
+
+== Inclusions ==
+
+One of the nice features of HTMLDefinition is that piggy-backing off
+of global attribute and content sets is extremely easy to do.
+
+=== Attributes ===
+
+HTMLModule->elements[$element]->attr stores attribute information for the
+specific attributes of $element. This is quite close to the final
+API that HTML Purifier interfaces with, but there's an important
+extra feature: attr may also contain a array with a member index zero.
+
+<?php
+    HTMLModule->elements[$element]->attr[0] = array('AttrSet');
+?>
+
+Rather than map the attribute key 0 to an array (which should be
+an AttrDef), it defines a number of attribute collections that should
+be merged into this elements attribute array.
+
+Furthermore, the value of an attribute key, attribute value pair need
+not be a fully fledged AttrDef object. They can also be a string, which
+signifies a AttrDef that is looked up from a centralized registry
+AttrTypes. This allows more concise attribute definitions that look
+more like W3C's declarations, as well as offering a centralized point
+for modifying the behavior of one attribute type. And, of course, the
+old method of manually instantiating an AttrDef still works.
+
+=== Attribute Collections ===
+
+Attribute collections are stored and processed in the AttrCollections
+object, which is responsible for performing the inclusions signified
+by the 0 index. These attribute collections, too, are mutable, by
+using HTMLModule->attr_collections. You may add new attributes
+to a collection or define an entirely new collection for your module's
+use. Inclusions can also be cumulative.
+
+Attribute collections allow us to get rid of so called "global attributes"
+(which actually aren't so global).
+
+=== Content Models and ChildDef ===
+
+An implementation of the above-mentioned attributes and attribute
+collections was applied to the ChildDef system. HTML Purifier uses
+a proprietary system called ChildDef for performance and flexibility
+reasons, but this does not line up very well with W3C's notion of
+regexps for defining the allowed children of an element.
+
+HTMLPurifier->elements[$element]->content_model and 
+HTMLPurifier->elements[$element]->content_model_type store information
+about the final ChildDef that will be stored in
+HTMLPurifier->elements[$element]->child (we use a different variable
+because the two forms are sufficiently different).
+
+$content_model is an abstract, string representation of the internal
+state of ChildDef, while $content_model_type is a string identifier
+of which ChildDef subclass to instantiate. $content_model is processed
+by substituting all content set identifiers (capitalized element names)
+with their contents. It is then parsed and passed into the appropriate
+ChildDef class, as defined by the ContentSets->getChildDef() or the
+custom fallback HTMLModule->getChildDef() for custom child definitions
+not in the core.
+
+You'll need to use these facilities if you plan on referencing a content
+set like "Inline" or "Block", and using them is recommended even if you're
+not due to their conciseness.
+
+A few notes on $content_model: it's structure can be as complicated
+as you want, but the pipe symbol (|) is reserved for defining possible
+choices, due to the content sets implementation. For example, a content
+model that looks like:
+
+"Inline -> Block -> a"
+
+...when the Inline content set is defined as "span | b" and the Block
+content set is defined as "div | blockquote", will expand into:
+
+"span | b -> div | blockquote -> a"
+
+The custom HTMLModule->getChildDef() function will need to be able to
+then feed this information to ChildDef in a usable manner.
+
+=== Content Sets ===
+
+Content sets can be altered using HTMLModule->content_sets, an associative
+array of content set names to content set contents. If the content set
+already exists, your values are appended on to it (great for, say,
+registering the font tag as an inline element), otherwise it is
+created. They are substituted into content_model.

docs/style.css

@@ -23,6 +23,8 @@ h4 {font-family:sans-serif; font-size:0.9em; font-weight:bold; }
 
 /* Marks off asides, discussions on why something is the way it is */
 .aside {margin-left:2em; font-family:sans-serif; font-size:0.9em; }
+blockquote .label {font-weight:bold; font-size:1em; margin:0 0 .1em;
+    border-bottom:1px solid #CCC;}
 
 /* A regular table */
 .table {border-collapse:collapse; border-bottom:2px solid #888; margin-left:2em; }
@@ -36,5 +38,31 @@ h4 {font-family:sans-serif; font-size:0.9em; font-weight:bold; }
 /* Contains, without exception, Return to index. */
 #index {font-size:smaller; }
 
+#home {font-size:smaller;}
+
 /* Contains, without exception, $Id$, for SVN version info. */
-#version {text-align:right; font-style:italic; margin:2em 0;}
+#version {text-align:right; font-style:italic; margin:2em 0;}
+
+#toc ol ol {list-style-type:lower-roman;}
+#toc ol {list-style-type:decimal;}
+#toc {list-style-type:upper-alpha;}
+
+q {
+  behavior: url(fixquotes.htc); /* IE fix */
+  quotes: '\201C' '\201D' '\2018' '\2019';
+}
+q:before {
+  content: open-quote;
+}
+q:after {
+  content: close-quote;
+}
+
+/* Marks off implementation details interesting only to the person writing
+   the class described in the spec. */
+.technical {margin-left:2em; }
+.technical:before {content:"Technical note: "; font-weight:bold; color:#061; }
+
+/* Marks off sections that are lacking. */
+.fixme {margin-left:2em; }
+.fixme:before {content:"Fix me: "; font-weight:bold; color:#C00; }

library/HTMLPurifier.func.php

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * Function wrapper for HTML Purifier for quick use.
+ * @note This function only includes the library when it is called. While
+ *       this is efficient for instances when you only use HTML Purifier
+ *       on a few of your pages, it murders bytecode caching. You still
+ *       need to add HTML Purifier to your path.
+ * @note ''HTMLPurifier()'' is NOT the same as ''new HTMLPurifier()''
+ */
+
+function HTMLPurifier($html, $config = null) {
+    static $purifier = false;
+    if (!$purifier) {
+        require_once 'HTMLPurifier.php';
+        $purifier = new HTMLPurifier();
+    }
+    return $purifier->purify($html, $config);
+}
+
+?>

library/HTMLPurifier.php

@@ -22,7 +22,7 @@
  */
 
 /*
-    HTML Purifier 1.2.0 - Standards Compliant HTML Filtering
+    HTML Purifier 1.4.1 - Standards Compliant HTML Filtering
     Copyright (C) 2006 Edward Z. Yang
 
     This library is free software; you can redistribute it and/or
@@ -64,52 +64,107 @@ require_once 'HTMLPurifier/Encoder.php';
 class HTMLPurifier
 {
     
+    var $version = '1.4.1';
+    
     var $config;
+    var $filters;
     
     var $lexer, $strategy, $generator;
     
+    /**
+     * Final HTMLPurifier_Context of last run purification. Might be an array.
+     * @public
+     */
+    var $context;
+    
     /**
      * Initializes the purifier.
      * @param $config Optional HTMLPurifier_Config object for all instances of
      *                the purifier, if omitted, a default configuration is
      *                supplied (which can be overridden on a per-use basis).
+     *                The parameter can also be any type that
+     *                HTMLPurifier_Config::create() supports.
      */
     function HTMLPurifier($config = null) {
         
-        $this->config = $config ? $config : HTMLPurifier_Config::createDefault();
+        $this->config = HTMLPurifier_Config::create($config);
         
         $this->lexer        = HTMLPurifier_Lexer::create();
         $this->strategy     = new HTMLPurifier_Strategy_Core();
         $this->generator    = new HTMLPurifier_Generator();
-        $this->encoder      = new HTMLPurifier_Encoder();
         
     }
     
+    /**
+     * Adds a filter to process the output. First come first serve
+     * @param $filter HTMLPurifier_Filter object
+     */
+    function addFilter($filter) {
+        $this->filters[] = $filter;
+    }
+    
     /**
      * Filters an HTML snippet/document to be XSS-free and standards-compliant.
      * 
      * @param $html String of HTML to purify
      * @param $config HTMLPurifier_Config object for this operation, if omitted,
      *                defaults to the config object specified during this
-     *                object's construction.
+     *                object's construction. The parameter can also be any type
+     *                that HTMLPurifier_Config::create() supports.
      * @return Purified HTML
      */
     function purify($html, $config = null) {
-        $config = $config ? $config : $this->config;
-        $context =& new HTMLPurifier_Context();
-        $html = $this->encoder->convertToUTF8($html, $config, $context);
+        
+        $config = $config ? HTMLPurifier_Config::create($config) : $this->config;
+        
+        $context = new HTMLPurifier_Context();
+        $html = HTMLPurifier_Encoder::convertToUTF8($html, $config, $context);
+        
+        for ($i = 0, $size = count($this->filters); $i < $size; $i++) {
+            $html = $this->filters[$i]->preFilter($html, $config, $context);
+        }
+        
+        // purified HTML
         $html = 
             $this->generator->generateFromTokens(
+                // list of tokens
                 $this->strategy->execute(
-                    $this->lexer->tokenizeHTML($html, $config, $context),
+                    // list of un-purified tokens
+                    $this->lexer->tokenizeHTML(
+                        // un-purified HTML
+                        $html, $config, $context
+                    ),
                     $config, $context
                 ),
                 $config, $context
             );
-        $html = $this->encoder->convertFromUTF8($html, $config, $context);
+        
+        for ($i = $size - 1; $i >= 0; $i--) {
+            $html = $this->filters[$i]->postFilter($html, $config, $context);
+        }
+        
+        $html = HTMLPurifier_Encoder::convertFromUTF8($html, $config, $context);
+        $this->context =& $context;
         return $html;
     }
     
+    /**
+     * Filters an array of HTML snippets
+     * @param $config Optional HTMLPurifier_Config object for this operation.
+     *                See HTMLPurifier::purify() for more details.
+     * @return Array of purified HTML
+     */
+    function purifyArray($array_of_html, $config = null) {
+        $context_array = array();
+        foreach ($array_of_html as $key => $html) {
+            $array_of_html[$key] = $this->purify($html, $config);
+            $context_array[$key] = $this->context;
+        }
+        $this->context = $context_array;
+        return $array_of_html;
+    }
+    
+    
 }
 
 ?>

library/HTMLPurifier/AttrCollections.php

@@ -0,0 +1,100 @@
+<?php
+
+require_once 'HTMLPurifier/AttrTypes.php';
+require_once 'HTMLPurifier/AttrDef/Lang.php';
+
+/**
+ * Defines common attribute collections that modules reference
+ */
+
+class HTMLPurifier_AttrCollections
+{
+    
+    /**
+     * Associative array of attribute collections, indexed by name
+     * @note Technically, the composition of these is more complicated,
+     *       but we bypass it using our own excludes property
+     */
+    var $info = array();
+    
+    /**
+     * Performs all expansions on internal data for use by other inclusions
+     * It also collects all attribute collection extensions from
+     * modules
+     * @param $attr_types HTMLPurifier_AttrTypes instance
+     * @param $modules Hash array of HTMLPurifier_HTMLModule members
+     */
+    function HTMLPurifier_AttrCollections($attr_types, $modules) {
+        $info =& $this->info;
+        // load extensions from the modules
+        foreach ($modules as $module) {
+            foreach ($module->attr_collections as $coll_i => $coll) {
+                foreach ($coll as $attr_i => $attr) {
+                    if ($attr_i === 0 && isset($info[$coll_i][$attr_i])) {
+                        // merge in includes
+                        $info[$coll_i][$attr_i] = array_merge(
+                            $info[$coll_i][$attr_i], $attr);
+                        continue;
+                    }
+                    $info[$coll_i][$attr_i] = $attr;
+                }
+            }
+        }
+        // perform internal expansions and inclusions
+        foreach ($info as $name => $attr) {
+            // merge attribute collections that include others
+            $this->performInclusions($info[$name]);
+            // replace string identifiers with actual attribute objects
+            $this->expandIdentifiers($info[$name], $attr_types);
+        }
+    }
+    
+    /**
+     * Takes a reference to an attribute associative array and performs
+     * all inclusions specified by the zero index.
+     * @param &$attr Reference to attribute array
+     */
+    function performInclusions(&$attr) {
+        if (!isset($attr[0])) return;
+        $merge = $attr[0];
+        // loop through all the inclusions
+        for ($i = 0; isset($merge[$i]); $i++) {
+            // foreach attribute of the inclusion, copy it over
+            foreach ($this->info[$merge[$i]] as $key => $value) {
+                if (isset($attr[$key])) continue; // also catches more inclusions
+                $attr[$key] = $value;
+            }
+            if (isset($info[$merge[$i]][0])) {
+                // recursion
+                $merge = array_merge($merge, isset($info[$merge[$i]][0]));
+            }
+        }
+        unset($attr[0]);
+    }
+    
+    /**
+     * Expands all string identifiers in an attribute array by replacing
+     * them with the appropriate values inside HTMLPurifier_AttrTypes
+     * @param &$attr Reference to attribute array
+     * @param $attr_types HTMLPurifier_AttrTypes instance
+     */
+    function expandIdentifiers(&$attr, $attr_types) {
+        foreach ($attr as $def_i => $def) {
+            if ($def_i === 0) continue;
+            if (!is_string($def)) continue;
+            if ($def === false) {
+                unset($attr[$def_i]);
+                continue;
+            }
+            if (isset($attr_types->info[$def])) {
+                $attr[$def_i] = $attr_types->info[$def];
+            } else {
+                trigger_error('Attempted to reference undefined attribute type', E_USER_ERROR);
+                unset($attr[$def_i]);
+            }
+        }
+    }
+    
+}
+
+?>

library/HTMLPurifier/AttrDef/CSS.php

@@ -8,6 +8,11 @@ require_once 'HTMLPurifier/CSSDefinition.php';
  * @note We don't implement the whole CSS specification, so it might be
  *       difficult to reuse this component in the context of validating
  *       actual stylesheet declarations.
+ * @note If we were really serious about validating the CSS, we would
+ *       tokenize the styles and then parse the tokens. Obviously, we
+ *       are not doing that. Doing that could seriously harm performance,
+ *       but would make these components a lot more viable for a CSS
+ *       filtering solution.
  */
 class HTMLPurifier_AttrDef_CSS extends HTMLPurifier_AttrDef
 {
@@ -20,6 +25,9 @@ class HTMLPurifier_AttrDef_CSS extends HTMLPurifier_AttrDef
         
         // we're going to break the spec and explode by semicolons.
         // This is because semicolon rarely appears in escaped form
+        // Doing this is generally flaky but fast
+        // IT MIGHT APPEAR IN URIs, see HTMLPurifier_AttrDef_CSSURI
+        // for details
         
         $declarations = explode(';', $css);
         $propvalues = array();

library/HTMLPurifier/AttrDef/CSS/Background.php

@@ -0,0 +1,87 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef.php';
+require_once 'HTMLPurifier/CSSDefinition.php';
+
+/**
+ * Validates shorthand CSS property background.
+ * @warning Does not support url tokens that have internal spaces.
+ */
+class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
+{
+    
+    /**
+     * Local copy of component validators.
+     * @note See HTMLPurifier_AttrDef_Font::$info for a similar impl.
+     */
+    var $info;
+    
+    function HTMLPurifier_AttrDef_CSS_Background($config) {
+        $def = $config->getCSSDefinition();
+        $this->info['background-color'] = $def->info['background-color'];
+        $this->info['background-image'] = $def->info['background-image'];
+        $this->info['background-repeat'] = $def->info['background-repeat'];
+        $this->info['background-attachment'] = $def->info['background-attachment'];
+        $this->info['background-position'] = $def->info['background-position'];
+    }
+    
+    function validate($string, $config, &$context) {
+        
+        // regular pre-processing
+        $string = $this->parseCDATA($string);
+        if ($string === '') return false;
+        
+        // assumes URI doesn't have spaces in it
+        $bits = explode(' ', strtolower($string)); // bits to process
+        
+        $caught = array();
+        $caught['color']    = false;
+        $caught['image']    = false;
+        $caught['repeat']   = false;
+        $caught['attachment'] = false;
+        $caught['position'] = false;
+        
+        $i = 0; // number of catches
+        $none = false;
+        
+        foreach ($bits as $bit) {
+            if ($bit === '') continue;
+            foreach ($caught as $key => $status) {
+                if ($key != 'position') {
+                    if ($status !== false) continue;
+                    $r = $this->info['background-' . $key]->validate($bit, $config, $context);
+                } else {
+                    $r = $bit;
+                }
+                if ($r === false) continue;
+                if ($key == 'position') {
+                    if ($caught[$key] === false) $caught[$key] = '';
+                    $caught[$key] .= $r . ' ';
+                } else {
+                    $caught[$key] = $r;
+                }
+                $i++;
+                break;
+            }
+        }
+        
+        if (!$i) return false;
+        if ($caught['position'] !== false) {
+            $caught['position'] = $this->info['background-position']->
+                validate($caught['position'], $config, $context);
+        }
+        
+        $ret = array();
+        foreach ($caught as $value) {
+            if ($value === false) continue;
+            $ret[] = $value;
+        }
+        
+        if (empty($ret)) return false;
+        return implode(' ', $ret);
+        
+    }
+    
+}
+
+?>

library/HTMLPurifier/AttrDef/CSS/BackgroundPosition.php

@@ -0,0 +1,130 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Length.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Percentage.php';
+
+/* W3C says:
+    [ // adjective and number must be in correct order, even if
+      // you could switch them without introducing ambiguity.
+      // some browsers support that syntax
+        [
+            <percentage> | <length> | left | center | right
+        ]
+        [ 
+            <percentage> | <length> | top | center | bottom
+        ]?
+    ] |
+    [ // this signifies that the vertical and horizontal adjectives
+      // can be arbitrarily ordered, however, there can only be two,
+      // one of each, or none at all
+        [
+            left | center | right
+        ] ||
+        [
+            top | center | bottom
+        ]
+    ]
+    top, left = 0%
+    center, (none) = 50%
+    bottom, right = 100%
+*/
+
+/* QuirksMode says:
+    keyword + length/percentage must be ordered correctly, as per W3C
+    
+    Internet Explorer and Opera, however, support arbitrary ordering. We
+    should fix it up.
+    
+    Minor issue though, not strictly necessary.
+*/
+
+// control freaks may appreciate the ability to convert these to
+// percentages or something, but it's not necessary
+
+/**
+ * Validates the value of background-position.
+ */
+class HTMLPurifier_AttrDef_CSS_BackgroundPosition extends HTMLPurifier_AttrDef
+{
+    
+    var $length;
+    var $percentage;
+    
+    function HTMLPurifier_AttrDef_CSS_BackgroundPosition() {
+        $this->length     = new HTMLPurifier_AttrDef_CSS_Length();
+        $this->percentage = new HTMLPurifier_AttrDef_CSS_Percentage();
+    }
+    
+    function validate($string, $config, &$context) {
+        $string = $this->parseCDATA($string);
+        $bits = explode(' ', $string);
+        
+        $keywords = array();
+        $keywords['h'] = false; // left, right
+        $keywords['v'] = false; // top, bottom
+        $keywords['c'] = false; // center
+        $measures = array();
+        
+        $i = 0;
+        
+        $lookup = array(
+            'top' => 'v',
+            'bottom' => 'v',
+            'left' => 'h',
+            'right' => 'h',
+            'center' => 'c'
+        );
+        
+        foreach ($bits as $bit) {
+            if ($bit === '') continue;
+            
+            // test for keyword
+            $lbit = ctype_lower($bit) ? $bit : strtolower($bit);
+            if (isset($lookup[$lbit])) {
+                $status = $lookup[$lbit];
+                $keywords[$status] = $lbit;
+                $i++;
+            }
+            
+            // test for length
+            $r = $this->length->validate($bit, $config, $context);
+            if ($r !== false) {
+                $measures[] = $r;
+                $i++;
+            }
+            
+            // test for percentage
+            $r = $this->percentage->validate($bit, $config, $context);
+            if ($r !== false) {
+                $measures[] = $r;
+                $i++;
+            }
+            
+        }
+        
+        if (!$i) return false; // no valid values were caught
+        
+        
+        $ret = array();
+        
+        // first keyword
+        if     ($keywords['h'])     $ret[] = $keywords['h'];
+        elseif (count($measures))   $ret[] = array_shift($measures);
+        elseif ($keywords['c']) {
+            $ret[] = $keywords['c'];
+            $keywords['c'] = false; // prevent re-use: center = center center
+        }
+        
+        if     ($keywords['v'])     $ret[] = $keywords['v'];
+        elseif (count($measures))   $ret[] = array_shift($measures);
+        elseif ($keywords['c'])     $ret[] = $keywords['c'];
+        
+        if (empty($ret)) return false;
+        return implode(' ', $ret);
+        
+    }
+    
+}
+
+?>

library/HTMLPurifier/AttrDef/CSS/Border.php

@@ -5,7 +5,7 @@ require_once 'HTMLPurifier/AttrDef.php';
 /**
  * Validates the border property as defined by CSS.
  */
-class HTMLPurifier_AttrDef_Border extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_CSS_Border extends HTMLPurifier_AttrDef
 {
     
     /**
@@ -13,7 +13,7 @@ class HTMLPurifier_AttrDef_Border extends HTMLPurifier_AttrDef
      */
     var $info = array();
     
-    function HTMLPurifier_AttrDef_Border($config) {
+    function HTMLPurifier_AttrDef_CSS_Border($config) {
         $def = $config->getCSSDefinition();
         $this->info['border-width'] = $def->info['border-width'];
         $this->info['border-style'] = $def->info['border-style'];

library/HTMLPurifier/AttrDef/CSS/Color.php

@@ -5,7 +5,7 @@ require_once 'HTMLPurifier/AttrDef.php';
 /**
  * Validates Color as defined by CSS.
  */
-class HTMLPurifier_AttrDef_Color extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_CSS_Color extends HTMLPurifier_AttrDef
 {
     
     /**

library/HTMLPurifier/AttrDef/CSS/Composite.php

@@ -9,7 +9,7 @@
  * especially useful for CSS values, which often are a choice between
  * an enumerated set of predefined values or a flexible data type.
  */
-class HTMLPurifier_AttrDef_Composite extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_CSS_Composite extends HTMLPurifier_AttrDef
 {
     
     /**
@@ -21,7 +21,7 @@ class HTMLPurifier_AttrDef_Composite extends HTMLPurifier_AttrDef
     /**
      * @param $defs List of HTMLPurifier_AttrDef objects
      */
-    function HTMLPurifier_AttrDef_Composite($defs) {
+    function HTMLPurifier_AttrDef_CSS_Composite($defs) {
         $this->defs = $defs;
     }
     

library/HTMLPurifier/AttrDef/CSS/Font.php

@@ -5,7 +5,7 @@ require_once 'HTMLPurifier/AttrDef.php';
 /**
  * Validates shorthand CSS property font.
  */
-class HTMLPurifier_AttrDef_Font extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_CSS_Font extends HTMLPurifier_AttrDef
 {
     
     /**
@@ -30,7 +30,7 @@ class HTMLPurifier_AttrDef_Font extends HTMLPurifier_AttrDef
         'status-bar' => true
     );
     
-    function HTMLPurifier_AttrDef_Font($config) {
+    function HTMLPurifier_AttrDef_CSS_Font($config) {
         $def = $config->getCSSDefinition();
         $this->info['font-style']   = $def->info['font-style'];
         $this->info['font-variant'] = $def->info['font-variant'];

library/HTMLPurifier/AttrDef/CSS/FontFamily.php

@@ -7,7 +7,7 @@ require_once 'HTMLPurifier/AttrDef.php';
 /**
  * Validates a font family list according to CSS spec
  */
-class HTMLPurifier_AttrDef_FontFamily extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_CSS_FontFamily extends HTMLPurifier_AttrDef
 {
     
     /**

library/HTMLPurifier/AttrDef/CSS/Length.php

@@ -1,13 +1,12 @@
 <?php
 
 require_once 'HTMLPurifier/AttrDef.php';
-require_once 'HTMLPurifier/AttrDef/Number.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Number.php';
 
 /**
  * Represents a Length as defined by CSS.
- * @warning Be sure not to confuse this with HTMLPurifier_AttrDef_Length!
  */
-class HTMLPurifier_AttrDef_CSSLength extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_CSS_Length extends HTMLPurifier_AttrDef
 {
     
     /**
@@ -26,8 +25,8 @@ class HTMLPurifier_AttrDef_CSSLength extends HTMLPurifier_AttrDef
      * @param $non_negative Bool indication whether or not negative values are
      *                      allowed.
      */
-    function HTMLPurifier_AttrDef_CSSLength($non_negative = false) {
-        $this->number_def = new HTMLPurifier_AttrDef_Number($non_negative);
+    function HTMLPurifier_AttrDef_CSS_Length($non_negative = false) {
+        $this->number_def = new HTMLPurifier_AttrDef_CSS_Number($non_negative);
     }
     
     function validate($length, $config, &$context) {
@@ -40,6 +39,7 @@ class HTMLPurifier_AttrDef_CSSLength extends HTMLPurifier_AttrDef
         
         // we assume all units are two characters
         $unit = substr($length, $strlen - 2);
+        if (!ctype_lower($unit)) $unit = strtolower($unit);
         $number = substr($length, 0, $strlen - 2);
         
         if (!isset($this->units[$unit])) return false;

library/HTMLPurifier/AttrDef/CSS/ListStyle.php

@@ -0,0 +1,80 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef.php';
+
+/**
+ * Validates shorthand CSS property list-style.
+ * @warning Does not support url tokens that have internal spaces.
+ */
+class HTMLPurifier_AttrDef_CSS_ListStyle extends HTMLPurifier_AttrDef
+{
+    
+    /**
+     * Local copy of component validators.
+     * @note See HTMLPurifier_AttrDef_CSS_Font::$info for a similar impl.
+     */
+    var $info;
+    
+    function HTMLPurifier_AttrDef_CSS_ListStyle($config) {
+        $def = $config->getCSSDefinition();
+        $this->info['list-style-type']     = $def->info['list-style-type'];
+        $this->info['list-style-position'] = $def->info['list-style-position'];
+        $this->info['list-style-image'] = $def->info['list-style-image'];
+    }
+    
+    function validate($string, $config, &$context) {
+        
+        // regular pre-processing
+        $string = $this->parseCDATA($string);
+        if ($string === '') return false;
+        
+        // assumes URI doesn't have spaces in it
+        $bits = explode(' ', strtolower($string)); // bits to process
+        
+        $caught = array();
+        $caught['type']     = false;
+        $caught['position'] = false;
+        $caught['image']    = false;
+        
+        $i = 0; // number of catches
+        $none = false;
+        
+        foreach ($bits as $bit) {
+            if ($i >= 3) return; // optimization bit
+            if ($bit === '') continue;
+            foreach ($caught as $key => $status) {
+                if ($status !== false) continue;
+                $r = $this->info['list-style-' . $key]->validate($bit, $config, $context);
+                if ($r === false) continue;
+                if ($r === 'none') {
+                    if ($none) continue;
+                    else $none = true;
+                    if ($key == 'image') continue;
+                }
+                $caught[$key] = $r;
+                $i++;
+                break;
+            }
+        }
+        
+        if (!$i) return false;
+        
+        $ret = array();
+        
+        // construct type
+        if ($caught['type']) $ret[] = $caught['type'];
+        
+        // construct image
+        if ($caught['image']) $ret[] = $caught['image'];
+        
+        // construct position
+        if ($caught['position']) $ret[] = $caught['position'];
+        
+        if (empty($ret)) return false;
+        return implode(' ', $ret);
+        
+    }
+    
+}
+
+?>

library/HTMLPurifier/AttrDef/CSS/Multiple.php

@@ -13,7 +13,7 @@ require_once 'HTMLPurifier/AttrDef.php';
  *       can only be used alone: it will never manifest as part of a multi
  *       shorthand declaration.  Thus, this class does not allow inherit.
  */
-class HTMLPurifier_AttrDef_Multiple extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_CSS_Multiple extends HTMLPurifier_AttrDef
 {
     
     /**
@@ -30,7 +30,7 @@ class HTMLPurifier_AttrDef_Multiple extends HTMLPurifier_AttrDef
      * @param $single HTMLPurifier_AttrDef to multiply
      * @param $max Max number of values allowed (usually four)
      */
-    function HTMLPurifier_AttrDef_Multiple($single, $max = 4) {
+    function HTMLPurifier_AttrDef_CSS_Multiple($single, $max = 4) {
         $this->single = $single;
         $this->max = $max;
     }

library/HTMLPurifier/AttrDef/CSS/Number.php

@@ -3,7 +3,7 @@
 /**
  * Validates a number as defined by the CSS spec.
  */
-class HTMLPurifier_AttrDef_Number extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
 {
     
     /**
@@ -14,7 +14,7 @@ class HTMLPurifier_AttrDef_Number extends HTMLPurifier_AttrDef
     /**
      * @param $non_negative Bool indicating whether negatives are forbidden
      */
-    function HTMLPurifier_AttrDef_Number($non_negative = false) {
+    function HTMLPurifier_AttrDef_CSS_Number($non_negative = false) {
         $this->non_negative = $non_negative;
     }
     

library/HTMLPurifier/AttrDef/CSS/Percentage.php

@@ -1,25 +1,24 @@
 <?php
 
 require_once 'HTMLPurifier/AttrDef.php';
-require_once 'HTMLPurifier/AttrDef/Number.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Number.php';
 
 /**
- * Validates a Percentage as defined by the HTML spec.
- * @note This also allows integer pixel values.
+ * Validates a Percentage as defined by the CSS spec.
  */
-class HTMLPurifier_AttrDef_Percentage extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_CSS_Percentage extends HTMLPurifier_AttrDef
 {
     
     /**
-     * Instance of HTMLPurifier_AttrDef_Number to defer pixel validation
+     * Instance of HTMLPurifier_AttrDef_CSS_Number to defer number validation
      */
     var $number_def;
     
     /**
      * @param Bool indicating whether to forbid negative values
      */
-    function HTMLPurifier_AttrDef_Percentage($non_negative = false) {
-        $this->number_def = new HTMLPurifier_AttrDef_Number($non_negative);
+    function HTMLPurifier_AttrDef_CSS_Percentage($non_negative = false) {
+        $this->number_def = new HTMLPurifier_AttrDef_CSS_Number($non_negative);
     }
     
     function validate($string, $config, &$context) {

library/HTMLPurifier/AttrDef/CSS/TextDecoration.php

@@ -7,7 +7,7 @@ require_once 'HTMLPurifier/AttrDef.php';
  * @note This class could be generalized into a version that acts sort of
  *       like Enum except you can compound the allowed values.
  */
-class HTMLPurifier_AttrDef_TextDecoration extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_CSS_TextDecoration extends HTMLPurifier_AttrDef
 {
     
     /**

library/HTMLPurifier/AttrDef/CSS/URI.php

@@ -0,0 +1,58 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef/URI.php';
+
+/**
+ * Validates a URI in CSS syntax, which uses url('http://example.com')
+ * @note While theoretically speaking a URI in a CSS document could
+ *       be non-embedded, as of CSS2 there is no such usage so we're
+ *       generalizing it. This may need to be changed in the future.
+ * @warning Since HTMLPurifier_AttrDef_CSS blindly uses semicolons as
+ *          the separator, you cannot put a literal semicolon in
+ *          in the URI. Try percent encoding it, in that case.
+ */
+class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
+{
+    
+    function HTMLPurifier_AttrDef_CSS_URI() {
+        $this->HTMLPurifier_AttrDef_URI(true); // always embedded
+    }
+    
+    function validate($uri_string, $config, &$context) {
+        // parse the URI out of the string and then pass it onto
+        // the parent object
+        
+        $uri_string = $this->parseCDATA($uri_string);
+        if (strpos($uri_string, 'url(') !== 0) return false;
+        $uri_string = substr($uri_string, 4);
+        $new_length = strlen($uri_string) - 1;
+        if ($uri_string[$new_length] != ')') return false;
+        $uri = trim(substr($uri_string, 0, $new_length));
+        
+        if (isset($uri[0]) && ($uri[0] == "'" || $uri[0] == '"')) {
+            $quote = $uri[0];
+            $new_length = strlen($uri) - 1;
+            if ($uri[$new_length] !== $quote) return false;
+            $uri = substr($uri, 1, $new_length - 1);
+        }
+        
+        $keys   = array(  '(',   ')',   ',',   ' ',   '"',   "'");
+        $values = array('\\(', '\\)', '\\,', '\\ ', '\\"', "\\'");
+        $uri = str_replace($values, $keys, $uri);
+        
+        $result = parent::validate($uri, $config, $context);
+        
+        if ($result === false) return false;
+        
+        // escape necessary characters according to CSS spec
+        // except for the comma, none of these should appear in the
+        // URI at all
+        $result = str_replace($keys, $values, $result);
+        
+        return "url($result)";
+        
+    }
+    
+}
+
+?>

library/HTMLPurifier/AttrDef/Enum.php

@@ -25,8 +25,8 @@ class HTMLPurifier_AttrDef_Enum extends HTMLPurifier_AttrDef
      * @param $case_sensitive Bool indicating whether or not case sensitive
      */
     function HTMLPurifier_AttrDef_Enum(
-        $valid_values = array(), $case_sensitive = false) {
-        
+        $valid_values = array(), $case_sensitive = false
+    ) {
         $this->valid_values = array_flip($valid_values);
         $this->case_sensitive = $case_sensitive;
     }

library/HTMLPurifier/AttrDef/HTML/ID.php

@@ -3,6 +3,22 @@
 require_once 'HTMLPurifier/AttrDef.php';
 require_once 'HTMLPurifier/IDAccumulator.php';
 
+HTMLPurifier_ConfigSchema::define(
+    'Attr', 'EnableID', false, 'bool',
+    'Allows the ID attribute in HTML.  This is disabled by default '.
+    'due to the fact that without proper configuration user input can '.
+    'easily break the validation of a webpage by specifying an ID that is '.
+    'already on the surrounding HTML.  If you don\'t mind throwing caution to '.
+    'the wind, enable this directive, but I strongly recommend you also '.
+    'consider blacklisting IDs you use (%Attr.IDBlacklist) or prefixing all '.
+    'user supplied IDs (%Attr.IDPrefix).  This directive has been available '.
+    'since 1.2.0, and when set to true reverts to the behavior of pre-1.2.0 '.
+    'versions.'
+);
+HTMLPurifier_ConfigSchema::defineAlias(
+    'HTML', 'EnableAttrID', 'Attr', 'EnableID'
+);
+
 HTMLPurifier_ConfigSchema::define(
     'Attr', 'IDPrefix', '', 'string',
     'String to prefix to IDs.  If you have no idea what IDs your pages '.
@@ -36,11 +52,16 @@ HTMLPurifier_ConfigSchema::define(
  *          blacklist. If you're hacking around, make sure you use load()!
  */
 
-class HTMLPurifier_AttrDef_ID extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_HTML_ID extends HTMLPurifier_AttrDef
 {
     
+    // ref functionality disabled, since we also have to verify
+    // whether or not the ID it refers to exists
+    
     function validate($id, $config, &$context) {
         
+        if (!$config->get('Attr', 'EnableID')) return false;
+        
         $id = trim($id); // trim it first
         
         if ($id === '') return false;
@@ -55,8 +76,10 @@ class HTMLPurifier_AttrDef_ID extends HTMLPurifier_AttrDef
                 '%Attr.IDPrefix is set', E_USER_WARNING);
         }
         
-        $id_accumulator =& $context->get('IDAccumulator');
-        if (isset($id_accumulator->ids[$id])) return false;
+        //if (!$this->ref) {
+            $id_accumulator =& $context->get('IDAccumulator');
+            if (isset($id_accumulator->ids[$id])) return false;
+        //}
         
         // we purposely avoid using regex, hopefully this is faster
         
@@ -71,7 +94,7 @@ class HTMLPurifier_AttrDef_ID extends HTMLPurifier_AttrDef
             $result = ($trim === '');
         }
         
-        if ($result) $id_accumulator->add($id);
+        if (/*!$this->ref && */$result) $id_accumulator->add($id);
         
         // if no change was made to the ID, return the result
         // else, return the new id if stripping whitespace made it

library/HTMLPurifier/AttrDef/HTML/Length.php

@@ -1,18 +1,16 @@
 <?php
 
 require_once 'HTMLPurifier/AttrDef.php';
-require_once 'HTMLPurifier/AttrDef/Pixels.php';
+require_once 'HTMLPurifier/AttrDef/HTML/Pixels.php';
 
 /**
  * Validates the HTML type length (not to be confused with CSS's length).
  * 
  * This accepts integer pixels or percentages as lengths for certain
- * HTML attributes. Don't use this for CSS: that's
- * HTMLPurifier_AttrDef_CSSLength which requires prefixes and allows a lot
- * more different types.
+ * HTML attributes.
  */
 
-class HTMLPurifier_AttrDef_Length extends HTMLPurifier_AttrDef_Pixels
+class HTMLPurifier_AttrDef_HTML_Length extends HTMLPurifier_AttrDef_HTML_Pixels
 {
     
     function validate($string, $config, &$context) {

library/HTMLPurifier/AttrDef/HTML/MultiLength.php

@@ -1,7 +1,7 @@
 <?php
 
 require_once 'HTMLPurifier/AttrDef.php';
-require_once 'HTMLPurifier/AttrDef/Length.php';
+require_once 'HTMLPurifier/AttrDef/HTML/Length.php';
 
 /**
  * Validates a MultiLength as defined by the HTML spec.
@@ -9,7 +9,7 @@ require_once 'HTMLPurifier/AttrDef/Length.php';
  * A multilength is either a integer (pixel count), a percentage, or
  * a relative number.
  */
-class HTMLPurifier_AttrDef_MultiLength extends HTMLPurifier_AttrDef_Length
+class HTMLPurifier_AttrDef_HTML_MultiLength extends HTMLPurifier_AttrDef_HTML_Length
 {
     
     function validate($string, $config, &$context) {
@@ -27,12 +27,14 @@ class HTMLPurifier_AttrDef_MultiLength extends HTMLPurifier_AttrDef_Length
         
         $int = substr($string, 0, $length - 1);
         
+        if ($int == '') return '*';
         if (!is_numeric($int)) return false;
         
         $int = (int) $int;
         
-        if ($int < 0) return '0*';
-        
+        if ($int < 0) return false;
+        if ($int == 0) return '0';
+        if ($int == 1) return '*';
         return ((string) $int) . '*';
         
     }

library/HTMLPurifier/AttrDef/HTML/Nmtokens.php

@@ -4,9 +4,13 @@ require_once 'HTMLPurifier/AttrDef.php';
 require_once 'HTMLPurifier/Config.php';
 
 /**
- * Validates the contents of the global HTML attribute class.
+ * Validates contents based on NMTOKENS attribute type.
+ * @note The only current use for this is the class attribute in HTML
+ * @note Could have some functionality factored out into Nmtoken class
+ * @warning We cannot assume this class will be used only for 'class'
+ *          attributes. Not sure how to hook in magic behavior, then.
  */
-class HTMLPurifier_AttrDef_Class extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef
 {
     
     function validate($string, $config, &$context) {
@@ -31,10 +35,10 @@ class HTMLPurifier_AttrDef_Class extends HTMLPurifier_AttrDef
         
         if (empty($matches[1])) return false;
         
-        // reconstruct class string
+        // reconstruct string
         $new_string = '';
-        foreach ($matches[1] as $class_names) {
-            $new_string .= $class_names . ' ';
+        foreach ($matches[1] as $token) {
+            $new_string .= $token . ' ';
         }
         $new_string = rtrim($new_string);
         

library/HTMLPurifier/AttrDef/HTML/Pixels.php

@@ -5,7 +5,7 @@ require_once 'HTMLPurifier/AttrDef.php';
 /**
  * Validates an integer representation of pixels according to the HTML spec.
  */
-class HTMLPurifier_AttrDef_Pixels extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_HTML_Pixels extends HTMLPurifier_AttrDef
 {
     
     function validate($string, $config, &$context) {

library/HTMLPurifier/AttrDef/Lang.php

@@ -46,10 +46,10 @@ class HTMLPurifier_AttrDef_Lang extends HTMLPurifier_AttrDef
         
         // process second subtag : $subtags[1]
         $length = strlen($subtags[1]);
-        if ($length == 0 || $length == 1 || $length > 8 || !ctype_alnum($subtags[1])) {
+        if ($length == 0 || ($length == 1 && $subtags[1] != 'x') || $length > 8 || !ctype_alnum($subtags[1])) {
             return $new_string;
         }
-        if (!ctype_lower($subtags[1])) $subtags[1] = strotolower($subtags[1]);
+        if (!ctype_lower($subtags[1])) $subtags[1] = strtolower($subtags[1]);
         
         $new_string .= '-' . $subtags[1];
         if ($num_subtags == 2) return $new_string;
@@ -61,7 +61,7 @@ class HTMLPurifier_AttrDef_Lang extends HTMLPurifier_AttrDef
                 return $new_string;
             }
             if (!ctype_lower($subtags[$i])) {
-                $subtags[$i] = strotolower($subtags[$i]);
+                $subtags[$i] = strtolower($subtags[$i]);
             }
             $new_string .= '-' . $subtags[$i];
         }

library/HTMLPurifier/AttrDef/ListStyle.php

@@ -1,78 +0,0 @@
-<?php
-
-require_once 'HTMLPurifier/AttrDef.php';
-
-/**
- * Validates shorthand CSS property list-style.
- * @note This currently does not support list-style-image, as that functionality
- *       is not implemented yet elsewhere.
- */
-class HTMLPurifier_AttrDef_ListStyle extends HTMLPurifier_AttrDef
-{
-    
-    /**
-     * Local copy of component validators.
-     * @note See HTMLPurifier_AttrDef_Font::$info for a similar impl.
-     */
-    var $info;
-    
-    function HTMLPurifier_AttrDef_ListStyle($config) {
-        $def = $config->getCSSDefinition();
-        $this->info['list-style-type']     = $def->info['list-style-type'];
-        $this->info['list-style-position'] = $def->info['list-style-position'];
-    }
-    
-    function validate($string, $config, &$context) {
-        
-        // regular pre-processing
-        $string = $this->parseCDATA($string);
-        if ($string === '') return false;
-        
-        $bits = explode(' ', strtolower($string)); // bits to process
-        
-        $caught_type = false;
-        $caught_position = false;
-        $caught_none = false; // as in keyword none, which is in all of them
-        
-        $ret = '';
-        
-        foreach ($bits as $bit) {
-            if ($caught_none && ($caught_type || $caught_position)) break;
-            if ($caught_type && $caught_position) break;
-            
-            if ($bit === '') continue;
-            
-            if ($bit === 'none') {
-                if ($caught_none) continue;
-                $caught_none = true;
-                $ret .= 'none ';
-                continue;
-            }
-            
-            // if we add anymore, roll it into a loop
-            
-            $r = $this->info['list-style-type']->validate($bit, $config, $context);
-            if ($r !== false) {
-                if ($caught_type) continue;
-                $caught_type = true;
-                $ret .= $r . ' ';
-                continue;
-            }
-            
-            $r = $this->info['list-style-position']->validate($bit, $config, $context);
-            if ($r !== false) {
-                if ($caught_position) continue;
-                $caught_position = true;
-                $ret .= $r . ' ';
-                continue;
-            }
-        }
-        
-        $ret = rtrim($ret);
-        return $ret ? $ret : false;
-        
-    }
-    
-}
-
-?>

library/HTMLPurifier/AttrDef/URI.php

@@ -3,7 +3,7 @@
 require_once 'HTMLPurifier/AttrDef.php';
 require_once 'HTMLPurifier/URIScheme.php';
 require_once 'HTMLPurifier/URISchemeRegistry.php';
-require_once 'HTMLPurifier/AttrDef/Host.php';
+require_once 'HTMLPurifier/AttrDef/URI/Host.php';
 require_once 'HTMLPurifier/PercentEncoder.php';
 
 HTMLPurifier_ConfigSchema::define(
@@ -24,7 +24,7 @@ HTMLPurifier_ConfigSchema::define(
     'This directive has been available since 1.2.0.'
 );
 
-HTMLPurifier_ConfigSchema::Define(
+HTMLPurifier_ConfigSchema::define(
     'URI', 'DisableExternal', false, 'bool',
     'Disables links to external websites.  This is a highly effective '.
     'anti-spam and anti-pagerank-leech measure, but comes at a hefty price: no'.
@@ -34,6 +34,57 @@ HTMLPurifier_ConfigSchema::Define(
     'This directive has been available since 1.2.0.'
 );
 
+HTMLPurifier_ConfigSchema::define(
+    'URI', 'DisableExternalResources', false, 'bool',
+    'Disables the embedding of external resources, preventing users from '.
+    'embedding things like images from other hosts. This prevents '.
+    'access tracking (good for email viewers), bandwidth leeching, '.
+    'cross-site request forging, goatse.cx posting, and '.
+    'other nasties, but also results in '.
+    'a loss of end-user functionality (they can\'t directly post a pic '.
+    'they posted from Flickr anymore). Use it if you don\'t have a '.
+    'robust user-content moderation team. This directive has been '.
+    'available since 1.3.0.'
+);
+
+HTMLPurifier_ConfigSchema::define(
+    'URI', 'DisableResources', false, 'bool',
+    'Disables embedding resources, essentially meaning no pictures. You can '.
+    'still link to them though. See %URI.DisableExternalResources for why '.
+    'this might be a good idea. This directive has been available since 1.3.0.'
+);
+
+HTMLPurifier_ConfigSchema::define(
+    'URI', 'Munge', null, 'string/null',
+    'Munges all browsable (usually http, https and ftp) URI\'s into some URL '.
+    'redirection service. Pass this directive a URI, with %s inserted where '.
+    'the url-encoded original URI should be inserted (sample: '.
+    '<code>http://www.google.com/url?q=%s</code>). '.
+    'This prevents PageRank leaks, while being as transparent as possible '.
+    'to users (you may also want to add some client side JavaScript to '.
+    'override the text in the statusbar). Warning: many security experts '.
+    'believe that this form of protection does not deter spam-bots. '.
+    'You can also use this directive to redirect users to a splash page '.
+    'telling them they are leaving your website. '.
+    'This directive has been available since 1.3.0.'
+);
+
+HTMLPurifier_ConfigSchema::define(
+    'URI', 'HostBlacklist', array(), 'list',
+    'List of strings that are forbidden in the host of any URI. Use it to '.
+    'kill domain names of spam, etc. Note that it will catch anything in '.
+    'the domain, so <tt>moo.com</tt> will catch <tt>moo.com.example.com</tt>. '.
+    'This directive has been available since 1.3.0.'
+);
+
+HTMLPurifier_ConfigSchema::define(
+    'URI', 'Disable', false, 'bool',
+    'Disables all URIs in all forms. Not sure why you\'d want to do that '.
+    '(after all, the Internet\'s founded on the notion of a hyperlink). '.
+    'This directive has been available since 1.3.0.'
+);
+HTMLPurifier_ConfigSchema::defineAlias('Attr', 'DisableURI', 'URI', 'Disable');
+
 /**
  * Validates a URI as defined by RFC 3986.
  * @note Scheme-specific mechanics deferred to HTMLPurifier_URIScheme
@@ -43,15 +94,15 @@ class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
     
     var $host;
     var $PercentEncoder;
-    var $embeds;
+    var $embeds_resource;
     
     /**
-     * @param $embeds Does the URI here result in an extra HTTP request?
+     * @param $embeds_resource_resource Does the URI here result in an extra HTTP request?
      */
-    function HTMLPurifier_AttrDef_URI($embeds = false) {
-        $this->host = new HTMLPurifier_AttrDef_Host();
+    function HTMLPurifier_AttrDef_URI($embeds_resource = false) {
+        $this->host = new HTMLPurifier_AttrDef_URI_Host();
         $this->PercentEncoder = new HTMLPurifier_PercentEncoder();
-        $this->embeds = (bool) $embeds;
+        $this->embeds_resource = (bool) $embeds_resource;
     }
     
     function validate($uri, $config, &$context) {
@@ -59,6 +110,8 @@ class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
         // We'll write stack-based parsers later, for now, use regexps to
         // get things working as fast as possible (irony)
         
+        if ($config->get('URI', 'Disable')) return false;
+        
         // parse as CDATA
         $uri = $this->parseCDATA($uri);
         
@@ -96,27 +149,34 @@ class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
             // no need to validate the scheme's fmt since we do that when we
             // retrieve the specific scheme object from the registry
             $scheme = ctype_lower($scheme) ? $scheme : strtolower($scheme);
-            $scheme_obj =& $registry->getScheme($scheme, $config, $context);
+            $scheme_obj = $registry->getScheme($scheme, $config, $context);
             if (!$scheme_obj) return false; // invalid scheme, clean it out
         } else {
-            $scheme_obj =& $registry->getScheme(
+            $scheme_obj = $registry->getScheme(
                 $config->get('URI', 'DefaultScheme'), $config, $context
             );
         }
         
         
-        // the URI we're processing embeds a resource in the page, but the URI
+        // the URI we're processing embeds_resource a resource in the page, but the URI
         // it references cannot be located
-        if ($this->embeds && !$scheme_obj->browsable) {
+        if ($this->embeds_resource && !$scheme_obj->browsable) {
             return false;
         }
         
         
         if ($authority !== null) {
             
-            // remove URI if it's absolute and we disallow externals
+            // remove URI if it's absolute and we disabled externals or
+            // if it's absolute and embedded and we disabled external resources
             unset($our_host);
-            if ($config->get('URI', 'DisableExternal')) {
+            if (
+                $config->get('URI', 'DisableExternal') ||
+                (
+                    $config->get('URI', 'DisableExternalResources') &&
+                    $this->embeds_resource
+                )
+            ) {
                 $our_host = $config->get('URI', 'Host');
                 if ($our_host === null) return false;
             }
@@ -143,6 +203,8 @@ class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
             $host = $this->host->validate($host, $config, $context);
             if ($host === false) $host = null;
             
+            if ($this->checkBlacklist($host, $config, $context)) return false;
+            
             // more lenient absolute checking
             if (isset($our_host)) {
                 $host_parts = array_reverse(explode('.', $host));
@@ -198,10 +260,37 @@ class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
         if ($query !== null) $result .= "?$query";
         if ($fragment !== null) $result .= "#$fragment";
         
+        // munge if necessary
+        $munge = $config->get('URI', 'Munge');
+        if (!empty($scheme_obj->browsable) && $munge !== null) {
+            if ($authority !== null) {
+                $result = str_replace('%s', rawurlencode($result), $munge);
+            }
+        }
+        
         return $result;
         
     }
     
+    /**
+     * Checks a host against an array blacklist
+     * @param $host Host to check
+     * @param $config HTMLPurifier_Config instance
+     * @param $context HTMLPurifier_Context instance
+     * @return bool Is spam?
+     */
+    function checkBlacklist($host, &$config, &$context) {
+        $blacklist = $config->get('URI', 'HostBlacklist');
+        if (!empty($blacklist)) {
+            foreach($blacklist as $blacklisted_host_fragment) {
+                if (strpos($host, $blacklisted_host_fragment) !== false) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+    
 }
 
 ?>

library/HTMLPurifier/AttrDef/URI/Email.php

@@ -2,7 +2,7 @@
 
 require_once 'HTMLPurifier/AttrDef.php';
 
-class HTMLPurifier_AttrDef_Email extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_URI_Email extends HTMLPurifier_AttrDef
 {
     
     /**

library/HTMLPurifier/AttrDef/URI/Email/SimpleCheck.php

@@ -1,12 +1,12 @@
 <?php
 
-require_once 'HTMLPurifier/AttrDef/Email.php';
+require_once 'HTMLPurifier/AttrDef/URI/Email.php';
 
 /**
  * Primitive email validation class based on the regexp found at 
  * http://www.regular-expressions.info/email.html
  */
-class HTMLPurifier_AttrDef_Email_SimpleCheck extends HTMLPurifier_AttrDef_Email
+class HTMLPurifier_AttrDef_URI_Email_SimpleCheck extends HTMLPurifier_AttrDef_URI_Email
 {
     
     function validate($string, $config, &$context) {

library/HTMLPurifier/AttrDef/URI/Host.php

@@ -1,28 +1,28 @@
 <?php
 
 require_once 'HTMLPurifier/AttrDef.php';
-require_once 'HTMLPurifier/AttrDef/IPv4.php';
-require_once 'HTMLPurifier/AttrDef/IPv6.php';
+require_once 'HTMLPurifier/AttrDef/URI/IPv4.php';
+require_once 'HTMLPurifier/AttrDef/URI/IPv6.php';
 
 /**
  * Validates a host according to the IPv4, IPv6 and DNS (future) specifications.
  */
-class HTMLPurifier_AttrDef_Host extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
 {
     
     /**
-     * Instance of HTMLPurifier_AttrDef_IPv4 sub-validator
+     * Instance of HTMLPurifier_AttrDef_URI_IPv4 sub-validator
      */
     var $ipv4;
     
     /**
-     * Instance of HTMLPurifier_AttrDef_IPv6 sub-validator
+     * Instance of HTMLPurifier_AttrDef_URI_IPv6 sub-validator
      */
     var $ipv6;
     
-    function HTMLPurifier_AttrDef_Host() {
-        $this->ipv4 = new HTMLPurifier_AttrDef_IPv4();
-        $this->ipv6 = new HTMLPurifier_AttrDef_IPv6();
+    function HTMLPurifier_AttrDef_URI_Host() {
+        $this->ipv4 = new HTMLPurifier_AttrDef_URI_IPv4();
+        $this->ipv6 = new HTMLPurifier_AttrDef_URI_IPv6();
     }
     
     function validate($string, $config, &$context) {

library/HTMLPurifier/AttrDef/URI/IPv4.php

@@ -6,7 +6,7 @@ require_once 'HTMLPurifier/AttrDef.php';
  * Validates an IPv4 address
  * @author Feyd @ forums.devnetwork.net (public domain)
  */
-class HTMLPurifier_AttrDef_IPv4 extends HTMLPurifier_AttrDef
+class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef
 {
     
     /**
@@ -15,7 +15,7 @@ class HTMLPurifier_AttrDef_IPv4 extends HTMLPurifier_AttrDef
      */
     var $ip4;
     
-    function HTMLPurifier_AttrDef_IPv4() {
+    function HTMLPurifier_AttrDef_URI_IPv4() {
         $oct = '(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])'; // 0-255
         $this->ip4 = "(?:{$oct}\\.{$oct}\\.{$oct}\\.{$oct})";
     }

library/HTMLPurifier/AttrDef/URI/IPv6.php

@@ -1,6 +1,6 @@
 <?php
 
-require_once 'HTMLPurifier/AttrDef/IPv4.php';
+require_once 'HTMLPurifier/AttrDef/URI/IPv4.php';
 
 /**
  * Validates an IPv6 address.
@@ -8,7 +8,7 @@ require_once 'HTMLPurifier/AttrDef/IPv4.php';
  * @note This function requires brackets to have been removed from address
  *       in URI.
  */
-class HTMLPurifier_AttrDef_IPv6 extends HTMLPurifier_AttrDef_IPv4
+class HTMLPurifier_AttrDef_URI_IPv6 extends HTMLPurifier_AttrDef_URI_IPv4
 {
     
     function validate($aIP, $config, &$context) {

library/HTMLPurifier/AttrTransform.php

@@ -21,7 +21,7 @@ class HTMLPurifier_AttrTransform
      * Abstract: makes changes to the attributes dependent on multiple values.
      * 
      * @param $attr Assoc array of attributes, usually from
-     *              HTMLPurifier_Token_Tag::$attributes
+     *              HTMLPurifier_Token_Tag::$attr
      * @param $config Mandatory HTMLPurifier_Config object.
      * @param $context Mandatory HTMLPurifier_Context object
      * @returns Processed attribute array.

library/HTMLPurifier/AttrTransform/BdoDir.php

@@ -20,7 +20,7 @@ HTMLPurifier_ConfigSchema::defineAllowedValues(
 class HTMLPurifier_AttrTransform_BdoDir extends HTMLPurifier_AttrTransform
 {
     
-    function transform($attr, $config, $context) {
+    function transform($attr, $config, &$context) {
         if (isset($attr['dir'])) return $attr;
         $attr['dir'] = $config->get('Attr', 'DefaultTextDir');
         return $attr;

library/HTMLPurifier/AttrTransform/ImgRequired.php

@@ -25,7 +25,7 @@ HTMLPurifier_ConfigSchema::define(
 class HTMLPurifier_AttrTransform_ImgRequired extends HTMLPurifier_AttrTransform
 {
     
-    function transform($attr, $config, $context) {
+    function transform($attr, $config, &$context) {
         
         $src = true;
         if (!isset($attr['src'])) {

library/HTMLPurifier/AttrTransform/Lang.php

@@ -10,7 +10,7 @@ require_once 'HTMLPurifier/AttrTransform.php';
 class HTMLPurifier_AttrTransform_Lang extends HTMLPurifier_AttrTransform
 {
     
-    function transform($attr, $config, $context) {
+    function transform($attr, $config, &$context) {
         
         $lang     = isset($attr['lang']) ? $attr['lang'] : false;
         $xml_lang = isset($attr['xml:lang']) ? $attr['xml:lang'] : false;

library/HTMLPurifier/AttrTransform/TextAlign.php

@@ -8,7 +8,7 @@ require_once 'HTMLPurifier/AttrTransform.php';
 class HTMLPurifier_AttrTransform_TextAlign
     extends HTMLPurifier_AttrTransform {
 
-    function transform($attr, $config, $context) {
+    function transform($attr, $config, &$context) {
         
         if (!isset($attr['align'])) return $attr;
         

library/HTMLPurifier/AttrTypes.php

@@ -0,0 +1,41 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef/HTML/ID.php';
+require_once 'HTMLPurifier/AttrDef/HTML/Length.php';
+require_once 'HTMLPurifier/AttrDef/HTML/MultiLength.php';
+require_once 'HTMLPurifier/AttrDef/HTML/Nmtokens.php';
+require_once 'HTMLPurifier/AttrDef/HTML/Pixels.php';
+require_once 'HTMLPurifier/AttrDef/Integer.php';
+require_once 'HTMLPurifier/AttrDef/Text.php';
+require_once 'HTMLPurifier/AttrDef/URI.php';
+
+/**
+ * Provides lookup array of attribute types to HTMLPurifier_AttrDef objects
+ */
+class HTMLPurifier_AttrTypes
+{
+    /**
+     * Lookup array of attribute string identifiers to concrete implementations
+     * @public
+     */
+    var $info = array();
+    
+    /**
+     * Constructs the info array
+     */
+    function HTMLPurifier_AttrTypes() {
+        $this->info['CDATA']    = new HTMLPurifier_AttrDef_Text();
+        $this->info['ID']       = new HTMLPurifier_AttrDef_HTML_ID();
+        $this->info['Length']   = new HTMLPurifier_AttrDef_HTML_Length();
+        $this->info['MultiLength'] = new HTMLPurifier_AttrDef_HTML_MultiLength();
+        $this->info['NMTOKENS'] = new HTMLPurifier_AttrDef_HTML_Nmtokens();
+        $this->info['Pixels']   = new HTMLPurifier_AttrDef_HTML_Pixels();
+        $this->info['Text']     = new HTMLPurifier_AttrDef_Text();
+        $this->info['URI']      = new HTMLPurifier_AttrDef_URI();
+        
+        // number is really a positive integer (one or more digits)
+        $this->info['Number']   = new HTMLPurifier_AttrDef_Integer(false, false, true);
+    }
+}
+
+?>

library/HTMLPurifier/CSSDefinition.php

@@ -1,16 +1,19 @@
 <?php
 
+require_once 'HTMLPurifier/AttrDef/CSS/Background.php';
+require_once 'HTMLPurifier/AttrDef/CSS/BackgroundPosition.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Border.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Color.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Composite.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Font.php';
+require_once 'HTMLPurifier/AttrDef/CSS/FontFamily.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Length.php';
+require_once 'HTMLPurifier/AttrDef/CSS/ListStyle.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Multiple.php';
+require_once 'HTMLPurifier/AttrDef/CSS/Percentage.php';
+require_once 'HTMLPurifier/AttrDef/CSS/TextDecoration.php';
+require_once 'HTMLPurifier/AttrDef/CSS/URI.php';
 require_once 'HTMLPurifier/AttrDef/Enum.php';
-require_once 'HTMLPurifier/AttrDef/Color.php';
-require_once 'HTMLPurifier/AttrDef/Composite.php';
-require_once 'HTMLPurifier/AttrDef/CSSLength.php';
-require_once 'HTMLPurifier/AttrDef/Percentage.php';
-require_once 'HTMLPurifier/AttrDef/Multiple.php';
-require_once 'HTMLPurifier/AttrDef/TextDecoration.php';
-require_once 'HTMLPurifier/AttrDef/FontFamily.php';
-require_once 'HTMLPurifier/AttrDef/Font.php';
-require_once 'HTMLPurifier/AttrDef/Border.php';
-require_once 'HTMLPurifier/AttrDef/ListStyle.php';
 
 /**
  * Defines allowed CSS attributes and what their values are.
@@ -40,7 +43,7 @@ class HTMLPurifier_CSSDefinition
             array('none', 'hidden', 'dotted', 'dashed', 'solid', 'double',
             'groove', 'ridge', 'inset', 'outset'), false);
         
-        $this->info['border-style'] = new HTMLPurifier_AttrDef_Multiple($border_style);
+        $this->info['border-style'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_style);
         
         $this->info['clear'] = new HTMLPurifier_AttrDef_Enum(
             array('none', 'left', 'right', 'both'), false);
@@ -51,113 +54,123 @@ class HTMLPurifier_CSSDefinition
         $this->info['font-variant'] = new HTMLPurifier_AttrDef_Enum(
             array('normal', 'small-caps'), false);
         
+        $uri_or_none = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_Enum(array('none')),
+                new HTMLPurifier_AttrDef_CSS_URI()
+            )
+        );
+        
         $this->info['list-style-position'] = new HTMLPurifier_AttrDef_Enum(
             array('inside', 'outside'), false);
         $this->info['list-style-type'] = new HTMLPurifier_AttrDef_Enum(
             array('disc', 'circle', 'square', 'decimal', 'lower-roman',
-            'upper-roman', 'lower-alpha', 'upper-alpha'), false);
+            'upper-roman', 'lower-alpha', 'upper-alpha', 'none'), false);
+        $this->info['list-style-image'] = $uri_or_none;
         
-        $this->info['list-style'] = new HTMLPurifier_AttrDef_ListStyle($config);
+        $this->info['list-style'] = new HTMLPurifier_AttrDef_CSS_ListStyle($config);
         
         $this->info['text-transform'] = new HTMLPurifier_AttrDef_Enum(
             array('capitalize', 'uppercase', 'lowercase', 'none'), false);
-        $this->info['color'] = new HTMLPurifier_AttrDef_Color();
+        $this->info['color'] = new HTMLPurifier_AttrDef_CSS_Color();
         
-        // technically speaking, this one should get its own validator, but
-        // since we don't support background images, it effectively is
-        // equivalent to color.  The only trouble is that if the author
-        // specifies an image and a color, they'll both end up getting dropped,
-        // even though we ought to implement it and just discard the image
-        // info.  This will be fixed in a later version (see TODO) when
-        // better URI filtering is implemented.
-        $this->info['background'] = 
+        $this->info['background-image'] = $uri_or_none;
+        $this->info['background-repeat'] = new HTMLPurifier_AttrDef_Enum(
+            array('repeat', 'repeat-x', 'repeat-y', 'no-repeat')
+        );
+        $this->info['background-attachment'] = new HTMLPurifier_AttrDef_Enum(
+            array('scroll', 'fixed')
+        );
+        $this->info['background-position'] = new HTMLPurifier_AttrDef_CSS_BackgroundPosition();
         
         $border_color = 
         $this->info['border-top-color'] = 
         $this->info['border-bottom-color'] = 
         $this->info['border-left-color'] = 
         $this->info['border-right-color'] = 
-        $this->info['background-color'] = new HTMLPurifier_AttrDef_Composite(array(
+        $this->info['background-color'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
             new HTMLPurifier_AttrDef_Enum(array('transparent')),
-            new HTMLPurifier_AttrDef_Color()
+            new HTMLPurifier_AttrDef_CSS_Color()
         ));
         
-        $this->info['border-color'] = new HTMLPurifier_AttrDef_Multiple($border_color);
+        $this->info['background'] = new HTMLPurifier_AttrDef_CSS_Background($config);
+        
+        $this->info['border-color'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_color);
         
         $border_width = 
         $this->info['border-top-width'] = 
         $this->info['border-bottom-width'] = 
         $this->info['border-left-width'] = 
-        $this->info['border-right-width'] = new HTMLPurifier_AttrDef_Composite(array(
+        $this->info['border-right-width'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
             new HTMLPurifier_AttrDef_Enum(array('thin', 'medium', 'thick')),
-            new HTMLPurifier_AttrDef_CSSLength(true) //disallow negative
+            new HTMLPurifier_AttrDef_CSS_Length(true) //disallow negative
         ));
         
-        $this->info['border-width'] = new HTMLPurifier_AttrDef_Multiple($border_width);
+        $this->info['border-width'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_width);
         
-        $this->info['letter-spacing'] = new HTMLPurifier_AttrDef_Composite(array(
+        $this->info['letter-spacing'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
             new HTMLPurifier_AttrDef_Enum(array('normal')),
-            new HTMLPurifier_AttrDef_CSSLength()
+            new HTMLPurifier_AttrDef_CSS_Length()
         ));
         
-        $this->info['word-spacing'] = new HTMLPurifier_AttrDef_Composite(array(
+        $this->info['word-spacing'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
             new HTMLPurifier_AttrDef_Enum(array('normal')),
-            new HTMLPurifier_AttrDef_CSSLength()
+            new HTMLPurifier_AttrDef_CSS_Length()
         ));
         
-        $this->info['font-size'] = new HTMLPurifier_AttrDef_Composite(array(
+        $this->info['font-size'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
             new HTMLPurifier_AttrDef_Enum(array('xx-small', 'x-small',
                 'small', 'medium', 'large', 'x-large', 'xx-large',
                 'larger', 'smaller')),
-            new HTMLPurifier_AttrDef_Percentage(),
-            new HTMLPurifier_AttrDef_CSSLength()
+            new HTMLPurifier_AttrDef_CSS_Percentage(),
+            new HTMLPurifier_AttrDef_CSS_Length()
         ));
         
-        $this->info['line-height'] = new HTMLPurifier_AttrDef_Composite(array(
+        $this->info['line-height'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
             new HTMLPurifier_AttrDef_Enum(array('normal')),
-            new HTMLPurifier_AttrDef_Number(true), // no negatives
-            new HTMLPurifier_AttrDef_CSSLength(true),
-            new HTMLPurifier_AttrDef_Percentage(true)
+            new HTMLPurifier_AttrDef_CSS_Number(true), // no negatives
+            new HTMLPurifier_AttrDef_CSS_Length(true),
+            new HTMLPurifier_AttrDef_CSS_Percentage(true)
         ));
         
         $margin =
         $this->info['margin-top'] = 
         $this->info['margin-bottom'] = 
         $this->info['margin-left'] = 
-        $this->info['margin-right'] = new HTMLPurifier_AttrDef_Composite(array(
-            new HTMLPurifier_AttrDef_CSSLength(),
-            new HTMLPurifier_AttrDef_Percentage(),
+        $this->info['margin-right'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
+            new HTMLPurifier_AttrDef_CSS_Length(),
+            new HTMLPurifier_AttrDef_CSS_Percentage(),
             new HTMLPurifier_AttrDef_Enum(array('auto'))
         ));
         
-        $this->info['margin'] = new HTMLPurifier_AttrDef_Multiple($margin);
+        $this->info['margin'] = new HTMLPurifier_AttrDef_CSS_Multiple($margin);
         
         // non-negative
         $padding =
         $this->info['padding-top'] = 
         $this->info['padding-bottom'] = 
         $this->info['padding-left'] = 
-        $this->info['padding-right'] = new HTMLPurifier_AttrDef_Composite(array(
-            new HTMLPurifier_AttrDef_CSSLength(true),
-            new HTMLPurifier_AttrDef_Percentage(true)
+        $this->info['padding-right'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
+            new HTMLPurifier_AttrDef_CSS_Length(true),
+            new HTMLPurifier_AttrDef_CSS_Percentage(true)
         ));
         
-        $this->info['padding'] = new HTMLPurifier_AttrDef_Multiple($padding);
+        $this->info['padding'] = new HTMLPurifier_AttrDef_CSS_Multiple($padding);
         
-        $this->info['text-indent'] = new HTMLPurifier_AttrDef_Composite(array(
-            new HTMLPurifier_AttrDef_CSSLength(),
-            new HTMLPurifier_AttrDef_Percentage()
+        $this->info['text-indent'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
+            new HTMLPurifier_AttrDef_CSS_Length(),
+            new HTMLPurifier_AttrDef_CSS_Percentage()
         ));
         
-        $this->info['width'] = new HTMLPurifier_AttrDef_Composite(array(
-            new HTMLPurifier_AttrDef_CSSLength(true),
-            new HTMLPurifier_AttrDef_Percentage(true),
+        $this->info['width'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
+            new HTMLPurifier_AttrDef_CSS_Length(true),
+            new HTMLPurifier_AttrDef_CSS_Percentage(true),
             new HTMLPurifier_AttrDef_Enum(array('auto'))
         ));
         
-        $this->info['text-decoration'] = new HTMLPurifier_AttrDef_TextDecoration();
+        $this->info['text-decoration'] = new HTMLPurifier_AttrDef_CSS_TextDecoration();
         
-        $this->info['font-family'] = new HTMLPurifier_AttrDef_FontFamily();
+        $this->info['font-family'] = new HTMLPurifier_AttrDef_CSS_FontFamily();
         
         // this could use specialized code
         $this->info['font-weight'] = new HTMLPurifier_AttrDef_Enum(
@@ -166,14 +179,14 @@ class HTMLPurifier_CSSDefinition
         
         // MUST be called after other font properties, as it references
         // a CSSDefinition object
-        $this->info['font'] = new HTMLPurifier_AttrDef_Font($config);
+        $this->info['font'] = new HTMLPurifier_AttrDef_CSS_Font($config);
         
         // same here
         $this->info['border'] =
         $this->info['border-bottom'] = 
         $this->info['border-top'] = 
         $this->info['border-left'] = 
-        $this->info['border-right'] = new HTMLPurifier_AttrDef_Border($config);
+        $this->info['border-right'] = new HTMLPurifier_AttrDef_CSS_Border($config);
         
         $this->info['border-collapse'] = new HTMLPurifier_AttrDef_Enum(array(
             'collapse', 'seperate'));
@@ -184,11 +197,11 @@ class HTMLPurifier_CSSDefinition
         $this->info['table-layout'] = new HTMLPurifier_AttrDef_Enum(array(
             'auto', 'fixed'));
         
-        $this->info['vertical-align'] = new HTMLPurifier_AttrDef_Composite(array(
+        $this->info['vertical-align'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
             new HTMLPurifier_AttrDef_Enum(array('baseline', 'sub', 'super',
                 'top', 'text-top', 'middle', 'bottom', 'text-bottom')),
-            new HTMLPurifier_AttrDef_CSSLength(),
-            new HTMLPurifier_AttrDef_Percentage()
+            new HTMLPurifier_AttrDef_CSS_Length(),
+            new HTMLPurifier_AttrDef_CSS_Percentage()
         ));
         
     }

library/HTMLPurifier/ChildDef.php

@@ -20,10 +20,9 @@ HTMLPurifier_ConfigSchema::define(
 class HTMLPurifier_ChildDef
 {
     /**
-     * Type of child definition, usually right-most part of class name lowercase
-     * 
-     * Used occasionally in terms of context.  Possible values include
-     * custom, required, optional and empty.
+     * Type of child definition, usually right-most part of class name lowercase.
+     * Used occasionally in terms of context.
+     * @public
      */
     var $type;
     
@@ -32,12 +31,15 @@ class HTMLPurifier_ChildDef
      * 
      * This is necessary for redundant checking when changes affecting
      * a child node may cause a parent node to now be disallowed.
+     * 
+     * @public
      */
     var $allow_empty;
     
     /**
      * Validates nodes according to definition and returns modification.
      * 
+     * @public
      * @param $tokens_of_children Array of HTMLPurifier_Token
      * @param $config HTMLPurifier_Config object
      * @param $context HTMLPurifier_Context object
@@ -50,391 +52,4 @@ class HTMLPurifier_ChildDef
     }
 }
 
-/**
- * Custom validation class, accepts DTD child definitions
- * 
- * @warning Currently this class is an all or nothing proposition, that is,
- *          it will only give a bool return value.
- * @note This class is currently not used by any code, although it is unit
- *       tested.
- */
-class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
-{
-    var $type = 'custom';
-    var $allow_empty = false;
-    /**
-     * Allowed child pattern as defined by the DTD
-     */
-    var $dtd_regex;
-    /**
-     * PCRE regex derived from $dtd_regex
-     * @private
-     */
-    var $_pcre_regex;
-    /**
-     * @param $dtd_regex Allowed child pattern from the DTD
-     */
-    function HTMLPurifier_ChildDef_Custom($dtd_regex) {
-        $this->dtd_regex = $dtd_regex;
-        $this->_compileRegex();
-    }
-    /**
-     * Compiles the PCRE regex from a DTD regex ($dtd_regex to $_pcre_regex)
-     */
-    function _compileRegex() {
-        $raw = str_replace(' ', '', $this->dtd_regex);
-        if ($raw{0} != '(') {
-            $raw = "($raw)";
-        }
-        $reg = str_replace(',', ',?', $raw);
-        $reg = preg_replace('/([#a-zA-Z0-9_.-]+)/', '(,?\\0)', $reg);
-        $this->_pcre_regex = $reg;
-    }
-    function validateChildren($tokens_of_children, $config, &$context) {
-        $list_of_children = '';
-        $nesting = 0; // depth into the nest
-        foreach ($tokens_of_children as $token) {
-            if (!empty($token->is_whitespace)) continue;
-            
-            $is_child = ($nesting == 0); // direct
-            
-            if ($token->type == 'start') {
-                $nesting++;
-            } elseif ($token->type == 'end') {
-                $nesting--;
-            }
-            
-            if ($is_child) {
-                $list_of_children .= $token->name . ',';
-            }
-        }
-        $list_of_children = rtrim($list_of_children, ',');
-        
-        $okay =
-            preg_match(
-                '/^'.$this->_pcre_regex.'$/',
-                $list_of_children
-            );
-        
-        return (bool) $okay;
-    }
-}
-
-/**
- * Definition that allows a set of elements, but disallows empty children.
- */
-class HTMLPurifier_ChildDef_Required extends HTMLPurifier_ChildDef
-{
-    /**
-     * Lookup table of allowed elements.
-     */
-    var $elements = array();
-    /**
-     * @param $elements List of allowed element names (lowercase).
-     */
-    function HTMLPurifier_ChildDef_Required($elements) {
-        if (is_string($elements)) {
-            $elements = str_replace(' ', '', $elements);
-            $elements = explode('|', $elements);
-        }
-        $elements = array_flip($elements);
-        foreach ($elements as $i => $x) $elements[$i] = true;
-        $this->elements = $elements;
-        $this->gen = new HTMLPurifier_Generator();
-    }
-    var $allow_empty = false;
-    var $type = 'required';
-    function validateChildren($tokens_of_children, $config, &$context) {
-        // if there are no tokens, delete parent node
-        if (empty($tokens_of_children)) return false;
-        
-        // the new set of children
-        $result = array();
-        
-        // current depth into the nest
-        $nesting = 0;
-        
-        // whether or not we're deleting a node
-        $is_deleting = false;
-        
-        // whether or not parsed character data is allowed
-        // this controls whether or not we silently drop a tag
-        // or generate escaped HTML from it
-        $pcdata_allowed = isset($this->elements['#PCDATA']);
-        
-        // a little sanity check to make sure it's not ALL whitespace
-        $all_whitespace = true;
-        
-        // some configuration
-        $escape_invalid_children = $config->get('Core', 'EscapeInvalidChildren');
-        
-        foreach ($tokens_of_children as $token) {
-            if (!empty($token->is_whitespace)) {
-                $result[] = $token;
-                continue;
-            }
-            $all_whitespace = false; // phew, we're not talking about whitespace
-            
-            $is_child = ($nesting == 0);
-            
-            if ($token->type == 'start') {
-                $nesting++;
-            } elseif ($token->type == 'end') {
-                $nesting--;
-            }
-            
-            if ($is_child) {
-                $is_deleting = false;
-                if (!isset($this->elements[$token->name])) {
-                    $is_deleting = true;
-                    if ($pcdata_allowed && $token->type == 'text') {
-                        $result[] = $token;
-                    } elseif ($pcdata_allowed && $escape_invalid_children) {
-                        $result[] = new HTMLPurifier_Token_Text(
-                            $this->gen->generateFromToken($token, $config)
-                        );
-                    }
-                    continue;
-                }
-            }
-            if (!$is_deleting || ($pcdata_allowed && $token->type == 'text')) {
-                $result[] = $token;
-            } elseif ($pcdata_allowed && $escape_invalid_children) {
-                $result[] =
-                    new HTMLPurifier_Token_Text(
-                        $this->gen->generateFromToken( $token, $config )
-                    );
-            } else {
-                // drop silently
-            }
-        }
-        if (empty($result)) return false;
-        if ($all_whitespace) return false;
-        if ($tokens_of_children == $result) return true;
-        return $result;
-    }
-}
-
-/**
- * Definition that allows a set of elements, and allows no children.
- * @note This is a hack to reuse code from HTMLPurifier_ChildDef_Required,
- *       really, one shouldn't inherit from the other.  Only altered behavior
- *       is to overload a returned false with an array.  Thus, it will never
- *       return false.
- */
-class HTMLPurifier_ChildDef_Optional extends HTMLPurifier_ChildDef_Required
-{
-    var $allow_empty = true;
-    var $type = 'optional';
-    function validateChildren($tokens_of_children, $config, &$context) {
-        $result = parent::validateChildren($tokens_of_children, $config, $context);
-        if ($result === false) return array();
-        return $result;
-    }
-}
-
-/**
- * Definition that disallows all elements.
- * @warning validateChildren() in this class is actually never called, because
- *          empty elements are corrected in HTMLPurifier_Strategy_MakeWellFormed
- *          before child definitions are parsed in earnest by
- *          HTMLPurifier_Strategy_FixNesting.
- */
-class HTMLPurifier_ChildDef_Empty extends HTMLPurifier_ChildDef
-{
-    var $allow_empty = true;
-    var $type = 'empty';
-    function HTMLPurifier_ChildDef_Empty() {}
-    function validateChildren($tokens_of_children, $config, &$context) {
-        return array();
-    }
-}
-
-/**
- * Definition that uses different definitions depending on context.
- * 
- * The del and ins tags are notable because they allow different types of
- * elements depending on whether or not they're in a block or inline context.
- * Chameleon allows this behavior to happen by using two different
- * definitions depending on context.  While this somewhat generalized,
- * it is specifically intended for those two tags.
- */
-class HTMLPurifier_ChildDef_Chameleon extends HTMLPurifier_ChildDef
-{
-    
-    /**
-     * Instance of the definition object to use when inline. Usually stricter.
-     */
-    var $inline;
-    /**
-     * Instance of the definition object to use when block.
-     */
-    var $block;
-    
-    /**
-     * @param $inline List of elements to allow when inline.
-     * @param $block List of elements to allow when block.
-     */
-    function HTMLPurifier_ChildDef_Chameleon($inline, $block) {
-        $this->inline = new HTMLPurifier_ChildDef_Optional($inline);
-        $this->block  = new HTMLPurifier_ChildDef_Optional($block);
-    }
-    
-    function validateChildren($tokens_of_children, $config, &$context) {
-        $parent_type = $context->get('ParentType');
-        switch ($parent_type) {
-            case 'unknown':
-            case 'inline':
-                $result = $this->inline->validateChildren(
-                    $tokens_of_children, $config, $context);
-                break;
-            case 'block':
-                $result = $this->block->validateChildren(
-                    $tokens_of_children, $config, $context);
-                break;
-            default:
-                trigger_error('Invalid context', E_USER_ERROR);
-                return false;
-        }
-        return $result;
-    }
-}
-
-/**
- * Definition for tables
- */
-class HTMLPurifier_ChildDef_Table extends HTMLPurifier_ChildDef
-{
-    var $allow_empty = false;
-    var $type = 'table';
-    function HTMLPurifier_ChildDef_Table() {}
-    function validateChildren($tokens_of_children, $config, &$context) {
-        if (empty($tokens_of_children)) return false;
-        
-        // this ensures that the loop gets run one last time before closing
-        // up. It's a little bit of a hack, but it works! Just make sure you
-        // get rid of the token later.
-        $tokens_of_children[] = false;
-        
-        // only one of these elements is allowed in a table
-        $caption = false;
-        $thead   = false;
-        $tfoot   = false;
-        
-        // as many of these as you want
-        $cols    = array();
-        $content = array();
-        
-        $nesting = 0; // current depth so we can determine nodes
-        $is_collecting = false; // are we globbing together tokens to package
-                                // into one of the collectors?
-        $collection = array(); // collected nodes
-        $tag_index = 0; // the first node might be whitespace,
-                            // so this tells us where the start tag is
-        
-        foreach ($tokens_of_children as $token) {
-            $is_child = ($nesting == 0);
-            
-            if ($token === false) {
-                // terminating sequence started
-            } elseif ($token->type == 'start') {
-                $nesting++;
-            } elseif ($token->type == 'end') {
-                $nesting--;
-            }
-            
-            // handle node collection
-            if ($is_collecting) {
-                if ($is_child) {
-                    // okay, let's stash the tokens away
-                    // first token tells us the type of the collection
-                    switch ($collection[$tag_index]->name) {
-                        case 'tr':
-                        case 'tbody':
-                            $content[] = $collection;
-                            break;
-                        case 'caption':
-                            if ($caption !== false) break;
-                            $caption = $collection;
-                            break;
-                        case 'thead':
-                        case 'tfoot':
-                            // access the appropriate variable, $thead or $tfoot
-                            $var = $collection[$tag_index]->name;
-                            if ($$var === false) {
-                                $$var = $collection;
-                            } else {
-                                // transmutate the first and less entries into
-                                // tbody tags, and then put into content
-                                $collection[$tag_index]->name = 'tbody';
-                                $collection[count($collection)-1]->name = 'tbody';
-                                $content[] = $collection;
-                            }
-                            break;
-                         case 'colgroup':
-                            $cols[] = $collection;
-                            break;
-                    }
-                    $collection = array();
-                    $is_collecting = false;
-                    $tag_index = 0;
-                } else {
-                    // add the node to the collection
-                    $collection[] = $token;
-                }
-            }
-            
-            // terminate
-            if ($token === false) break;
-            
-            if ($is_child) {
-                // determine what we're dealing with
-                if ($token->name == 'col') {
-                    // the only empty tag in the possie, we can handle it
-                    // immediately
-                    $cols[] = array_merge($collection, array($token));
-                    $collection = array();
-                    $tag_index = 0;
-                    continue;
-                }
-                switch($token->name) {
-                    case 'caption':
-                    case 'colgroup':
-                    case 'thead':
-                    case 'tfoot':
-                    case 'tbody':
-                    case 'tr':
-                        $is_collecting = true;
-                        $collection[] = $token;
-                        continue;
-                    default:
-                        if ($token->type == 'text' && $token->is_whitespace) {
-                            $collection[] = $token;
-                            $tag_index++;
-                        }
-                        continue;
-                }
-            }
-        }
-        
-        if (empty($content)) return false;
-        
-        $ret = array();
-        if ($caption !== false) $ret = array_merge($ret, $caption);
-        if ($cols !== false)    foreach ($cols as $token_array) $ret = array_merge($ret, $token_array);
-        if ($thead !== false)   $ret = array_merge($ret, $thead);
-        if ($tfoot !== false)   $ret = array_merge($ret, $tfoot);
-        foreach ($content as $token_array) $ret = array_merge($ret, $token_array);
-        if (!empty($collection) && $is_collecting == false){
-            // grab the trailing space
-            $ret = array_merge($ret, $collection);
-        }
-        
-        array_pop($tokens_of_children); // remove phantom token
-        
-        return ($ret === $tokens_of_children) ? true : $ret;
-        
-    }
-}
-
 ?>

library/HTMLPurifier/ChildDef/Chameleon.php

@@ -0,0 +1,51 @@
+<?php
+
+require_once 'HTMLPurifier/ChildDef.php';
+
+/**
+ * Definition that uses different definitions depending on context.
+ * 
+ * The del and ins tags are notable because they allow different types of
+ * elements depending on whether or not they're in a block or inline context.
+ * Chameleon allows this behavior to happen by using two different
+ * definitions depending on context.  While this somewhat generalized,
+ * it is specifically intended for those two tags.
+ */
+class HTMLPurifier_ChildDef_Chameleon extends HTMLPurifier_ChildDef
+{
+    
+    /**
+     * Instance of the definition object to use when inline. Usually stricter.
+     * @public
+     */
+    var $inline;
+    
+    /**
+     * Instance of the definition object to use when block.
+     * @public
+     */
+    var $block;
+    
+    var $type = 'chameleon';
+    
+    /**
+     * @param $inline List of elements to allow when inline.
+     * @param $block List of elements to allow when block.
+     */
+    function HTMLPurifier_ChildDef_Chameleon($inline, $block) {
+        $this->inline = new HTMLPurifier_ChildDef_Optional($inline);
+        $this->block  = new HTMLPurifier_ChildDef_Optional($block);
+    }
+    
+    function validateChildren($tokens_of_children, $config, &$context) {
+        if ($context->get('IsInline') === false) {
+            return $this->block->validateChildren(
+                $tokens_of_children, $config, $context);
+        } else {
+            return $this->inline->validateChildren(
+                $tokens_of_children, $config, $context);
+        }
+    }
+}
+
+?>

library/HTMLPurifier/ChildDef/Custom.php

@@ -0,0 +1,75 @@
+<?php
+
+require_once 'HTMLPurifier/ChildDef.php';
+
+/**
+ * Custom validation class, accepts DTD child definitions
+ * 
+ * @warning Currently this class is an all or nothing proposition, that is,
+ *          it will only give a bool return value.
+ * @note This class is currently not used by any code, although it is unit
+ *       tested.
+ */
+class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
+{
+    var $type = 'custom';
+    var $allow_empty = false;
+    /**
+     * Allowed child pattern as defined by the DTD
+     */
+    var $dtd_regex;
+    /**
+     * PCRE regex derived from $dtd_regex
+     * @private
+     */
+    var $_pcre_regex;
+    /**
+     * @param $dtd_regex Allowed child pattern from the DTD
+     */
+    function HTMLPurifier_ChildDef_Custom($dtd_regex) {
+        $this->dtd_regex = $dtd_regex;
+        $this->_compileRegex();
+    }
+    /**
+     * Compiles the PCRE regex from a DTD regex ($dtd_regex to $_pcre_regex)
+     */
+    function _compileRegex() {
+        $raw = str_replace(' ', '', $this->dtd_regex);
+        if ($raw{0} != '(') {
+            $raw = "($raw)";
+        }
+        $reg = str_replace(',', ',?', $raw);
+        $reg = preg_replace('/([#a-zA-Z0-9_.-]+)/', '(,?\\0)', $reg);
+        $this->_pcre_regex = $reg;
+    }
+    function validateChildren($tokens_of_children, $config, &$context) {
+        $list_of_children = '';
+        $nesting = 0; // depth into the nest
+        foreach ($tokens_of_children as $token) {
+            if (!empty($token->is_whitespace)) continue;
+            
+            $is_child = ($nesting == 0); // direct
+            
+            if ($token->type == 'start') {
+                $nesting++;
+            } elseif ($token->type == 'end') {
+                $nesting--;
+            }
+            
+            if ($is_child) {
+                $list_of_children .= $token->name . ',';
+            }
+        }
+        $list_of_children = rtrim($list_of_children, ',');
+        
+        $okay =
+            preg_match(
+                '/^'.$this->_pcre_regex.'$/',
+                $list_of_children
+            );
+        
+        return (bool) $okay;
+    }
+}
+
+?>

library/HTMLPurifier/ChildDef/Empty.php

@@ -0,0 +1,22 @@
+<?php
+
+require_once 'HTMLPurifier/ChildDef.php';
+
+/**
+ * Definition that disallows all elements.
+ * @warning validateChildren() in this class is actually never called, because
+ *          empty elements are corrected in HTMLPurifier_Strategy_MakeWellFormed
+ *          before child definitions are parsed in earnest by
+ *          HTMLPurifier_Strategy_FixNesting.
+ */
+class HTMLPurifier_ChildDef_Empty extends HTMLPurifier_ChildDef
+{
+    var $allow_empty = true;
+    var $type = 'empty';
+    function HTMLPurifier_ChildDef_Empty() {}
+    function validateChildren($tokens_of_children, $config, &$context) {
+        return array();
+    }
+}
+
+?>

library/HTMLPurifier/ChildDef/Optional.php

@@ -0,0 +1,23 @@
+<?php
+
+require_once 'HTMLPurifier/ChildDef/Required.php';
+
+/**
+ * Definition that allows a set of elements, and allows no children.
+ * @note This is a hack to reuse code from HTMLPurifier_ChildDef_Required,
+ *       really, one shouldn't inherit from the other.  Only altered behavior
+ *       is to overload a returned false with an array.  Thus, it will never
+ *       return false.
+ */
+class HTMLPurifier_ChildDef_Optional extends HTMLPurifier_ChildDef_Required
+{
+    var $allow_empty = true;
+    var $type = 'optional';
+    function validateChildren($tokens_of_children, $config, &$context) {
+        $result = parent::validateChildren($tokens_of_children, $config, $context);
+        if ($result === false) return array();
+        return $result;
+    }
+}
+
+?>

library/HTMLPurifier/ChildDef/Required.php

@@ -0,0 +1,107 @@
+<?php
+
+require_once 'HTMLPurifier/ChildDef.php';
+
+/**
+ * Definition that allows a set of elements, but disallows empty children.
+ */
+class HTMLPurifier_ChildDef_Required extends HTMLPurifier_ChildDef
+{
+    /**
+     * Lookup table of allowed elements.
+     * @public
+     */
+    var $elements = array();
+    /**
+     * @param $elements List of allowed element names (lowercase).
+     */
+    function HTMLPurifier_ChildDef_Required($elements) {
+        if (is_string($elements)) {
+            $elements = str_replace(' ', '', $elements);
+            $elements = explode('|', $elements);
+        }
+        $keys = array_keys($elements);
+        if ($keys == array_keys($keys)) {
+            $elements = array_flip($elements);
+            foreach ($elements as $i => $x) {
+                $elements[$i] = true;
+                if (empty($i)) unset($elements[$i]);
+            }
+        }
+        $this->elements = $elements;
+        $this->gen = new HTMLPurifier_Generator();
+    }
+    var $allow_empty = false;
+    var $type = 'required';
+    function validateChildren($tokens_of_children, $config, &$context) {
+        // if there are no tokens, delete parent node
+        if (empty($tokens_of_children)) return false;
+        
+        // the new set of children
+        $result = array();
+        
+        // current depth into the nest
+        $nesting = 0;
+        
+        // whether or not we're deleting a node
+        $is_deleting = false;
+        
+        // whether or not parsed character data is allowed
+        // this controls whether or not we silently drop a tag
+        // or generate escaped HTML from it
+        $pcdata_allowed = isset($this->elements['#PCDATA']);
+        
+        // a little sanity check to make sure it's not ALL whitespace
+        $all_whitespace = true;
+        
+        // some configuration
+        $escape_invalid_children = $config->get('Core', 'EscapeInvalidChildren');
+        
+        foreach ($tokens_of_children as $token) {
+            if (!empty($token->is_whitespace)) {
+                $result[] = $token;
+                continue;
+            }
+            $all_whitespace = false; // phew, we're not talking about whitespace
+            
+            $is_child = ($nesting == 0);
+            
+            if ($token->type == 'start') {
+                $nesting++;
+            } elseif ($token->type == 'end') {
+                $nesting--;
+            }
+            
+            if ($is_child) {
+                $is_deleting = false;
+                if (!isset($this->elements[$token->name])) {
+                    $is_deleting = true;
+                    if ($pcdata_allowed && $token->type == 'text') {
+                        $result[] = $token;
+                    } elseif ($pcdata_allowed && $escape_invalid_children) {
+                        $result[] = new HTMLPurifier_Token_Text(
+                            $this->gen->generateFromToken($token, $config)
+                        );
+                    }
+                    continue;
+                }
+            }
+            if (!$is_deleting || ($pcdata_allowed && $token->type == 'text')) {
+                $result[] = $token;
+            } elseif ($pcdata_allowed && $escape_invalid_children) {
+                $result[] =
+                    new HTMLPurifier_Token_Text(
+                        $this->gen->generateFromToken( $token, $config )
+                    );
+            } else {
+                // drop silently
+            }
+        }
+        if (empty($result)) return false;
+        if ($all_whitespace) return false;
+        if ($tokens_of_children == $result) return true;
+        return $result;
+    }
+}
+
+?>

library/HTMLPurifier/ChildDef/StrictBlockquote.php

@@ -0,0 +1,76 @@
+<?php
+
+require_once 'HTMLPurifier/ChildDef/Required.php';
+
+/**
+ * Takes the contents of blockquote when in strict and reformats for validation.
+ */
+class   HTMLPurifier_ChildDef_StrictBlockquote
+extends HTMLPurifier_ChildDef_Required
+{
+    var $real_elements;
+    var $fake_elements;
+    var $allow_empty = true;
+    var $type = 'strictblockquote';
+    var $init = false;
+    function validateChildren($tokens_of_children, $config, &$context) {
+        
+        $def = $config->getHTMLDefinition();
+        if (!$this->init) {
+            // allow all inline elements
+            $this->real_elements = $this->elements;
+            $this->fake_elements = $def->info_content_sets['Flow'];
+            $this->fake_elements['#PCDATA'] = true;
+            $this->init = true;
+        }
+        
+        // trick the parent class into thinking it allows more
+        $this->elements = $this->fake_elements;
+        $result = parent::validateChildren($tokens_of_children, $config, $context);
+        $this->elements = $this->real_elements;
+        
+        if ($result === false) return array();
+        if ($result === true) $result = $tokens_of_children;
+        
+        $block_wrap_start = new HTMLPurifier_Token_Start($def->info_block_wrapper);
+        $block_wrap_end   = new HTMLPurifier_Token_End(  $def->info_block_wrapper);
+        $is_inline = false;
+        $depth = 0;
+        $ret = array();
+        
+        // assuming that there are no comment tokens
+        foreach ($result as $i => $token) {
+            $token = $result[$i];
+            // ifs are nested for readability
+            if (!$is_inline) {
+                if (!$depth) {
+                     if (
+                        $token->type == 'text' ||
+                        !isset($this->elements[$token->name])
+                     ) {
+                        $is_inline = true;
+                        $ret[] = $block_wrap_start;
+                     }
+                }
+            } else {
+                if (!$depth) {
+                    // starting tokens have been inline text / empty
+                    if ($token->type == 'start' || $token->type == 'empty') {
+                        if (isset($this->elements[$token->name])) {
+                            // ended
+                            $ret[] = $block_wrap_end;
+                            $is_inline = false;
+                        }
+                    }
+                }
+            }
+            $ret[] = $token;
+            if ($token->type == 'start') $depth++;
+            if ($token->type == 'end')   $depth--;
+        }
+        if ($is_inline) $ret[] = $block_wrap_end;
+        return $ret;
+    }
+}
+
+?>

library/HTMLPurifier/ChildDef/Table.php

@@ -0,0 +1,142 @@
+<?php
+
+require_once 'HTMLPurifier/ChildDef.php';
+
+/**
+ * Definition for tables
+ */
+class HTMLPurifier_ChildDef_Table extends HTMLPurifier_ChildDef
+{
+    var $allow_empty = false;
+    var $type = 'table';
+    function HTMLPurifier_ChildDef_Table() {}
+    function validateChildren($tokens_of_children, $config, &$context) {
+        if (empty($tokens_of_children)) return false;
+        
+        // this ensures that the loop gets run one last time before closing
+        // up. It's a little bit of a hack, but it works! Just make sure you
+        // get rid of the token later.
+        $tokens_of_children[] = false;
+        
+        // only one of these elements is allowed in a table
+        $caption = false;
+        $thead   = false;
+        $tfoot   = false;
+        
+        // as many of these as you want
+        $cols    = array();
+        $content = array();
+        
+        $nesting = 0; // current depth so we can determine nodes
+        $is_collecting = false; // are we globbing together tokens to package
+                                // into one of the collectors?
+        $collection = array(); // collected nodes
+        $tag_index = 0; // the first node might be whitespace,
+                            // so this tells us where the start tag is
+        
+        foreach ($tokens_of_children as $token) {
+            $is_child = ($nesting == 0);
+            
+            if ($token === false) {
+                // terminating sequence started
+            } elseif ($token->type == 'start') {
+                $nesting++;
+            } elseif ($token->type == 'end') {
+                $nesting--;
+            }
+            
+            // handle node collection
+            if ($is_collecting) {
+                if ($is_child) {
+                    // okay, let's stash the tokens away
+                    // first token tells us the type of the collection
+                    switch ($collection[$tag_index]->name) {
+                        case 'tr':
+                        case 'tbody':
+                            $content[] = $collection;
+                            break;
+                        case 'caption':
+                            if ($caption !== false) break;
+                            $caption = $collection;
+                            break;
+                        case 'thead':
+                        case 'tfoot':
+                            // access the appropriate variable, $thead or $tfoot
+                            $var = $collection[$tag_index]->name;
+                            if ($$var === false) {
+                                $$var = $collection;
+                            } else {
+                                // transmutate the first and less entries into
+                                // tbody tags, and then put into content
+                                $collection[$tag_index]->name = 'tbody';
+                                $collection[count($collection)-1]->name = 'tbody';
+                                $content[] = $collection;
+                            }
+                            break;
+                         case 'colgroup':
+                            $cols[] = $collection;
+                            break;
+                    }
+                    $collection = array();
+                    $is_collecting = false;
+                    $tag_index = 0;
+                } else {
+                    // add the node to the collection
+                    $collection[] = $token;
+                }
+            }
+            
+            // terminate
+            if ($token === false) break;
+            
+            if ($is_child) {
+                // determine what we're dealing with
+                if ($token->name == 'col') {
+                    // the only empty tag in the possie, we can handle it
+                    // immediately
+                    $cols[] = array_merge($collection, array($token));
+                    $collection = array();
+                    $tag_index = 0;
+                    continue;
+                }
+                switch($token->name) {
+                    case 'caption':
+                    case 'colgroup':
+                    case 'thead':
+                    case 'tfoot':
+                    case 'tbody':
+                    case 'tr':
+                        $is_collecting = true;
+                        $collection[] = $token;
+                        continue;
+                    default:
+                        if ($token->type == 'text' && $token->is_whitespace) {
+                            $collection[] = $token;
+                            $tag_index++;
+                        }
+                        continue;
+                }
+            }
+        }
+        
+        if (empty($content)) return false;
+        
+        $ret = array();
+        if ($caption !== false) $ret = array_merge($ret, $caption);
+        if ($cols !== false)    foreach ($cols as $token_array) $ret = array_merge($ret, $token_array);
+        if ($thead !== false)   $ret = array_merge($ret, $thead);
+        if ($tfoot !== false)   $ret = array_merge($ret, $tfoot);
+        foreach ($content as $token_array) $ret = array_merge($ret, $token_array);
+        if (!empty($collection) && $is_collecting == false){
+            // grab the trailing space
+            $ret = array_merge($ret, $collection);
+        }
+        
+        array_pop($tokens_of_children); // remove phantom token
+        
+        return ($ret === $tokens_of_children) ? true : $ret;
+        
+    }
+}
+
+?>

library/HTMLPurifier/Config.php

@@ -44,8 +44,26 @@ class HTMLPurifier_Config
         $this->def  = $definition; // keep a copy around for checking
     }
     
+    /**
+     * Convenience constructor that creates a config object based on a mixed var
+     * @static
+     * @param mixed $config Variable that defines the state of the config
+     *                      object. Can be: a HTMLPurifier_Config() object,
+     *                      an array of directives based on loadArray(),
+     *                      or a string filename of an ini file.
+     * @return Configured HTMLPurifier_Config object
+     */
+    function create($config) {
+        if (is_a($config, 'HTMLPurifier_Config')) return $config;
+        $ret = HTMLPurifier_Config::createDefault();
+        if (is_string($config)) $ret->loadIni($config);
+        elseif (is_array($config)) $ret->loadArray($config);
+        return $ret;
+    }
+    
     /**
      * Convenience constructor that creates a default configuration object.
+     * @static
      * @return Default HTMLPurifier_Config object.
      */
     function createDefault() {
@@ -59,27 +77,55 @@ class HTMLPurifier_Config
      * @param $namespace String namespace
      * @param $key String key
      */
-    function get($namespace, $key) {
+    function get($namespace, $key, $from_alias = false) {
         if (!isset($this->def->info[$namespace][$key])) {
             trigger_error('Cannot retrieve value of undefined directive',
                 E_USER_WARNING);
             return;
         }
+        if ($this->def->info[$namespace][$key]->class == 'alias') {
+            trigger_error('Cannot get value from aliased directive, use real name',
+                E_USER_ERROR);
+            return;
+        }
         return $this->conf[$namespace][$key];
     }
     
+    /**
+     * Retreives an array of directives to values from a given namespace
+     * @param $namespace String namespace
+     */
+    function getBatch($namespace) {
+        if (!isset($this->def->info[$namespace])) {
+            trigger_error('Cannot retrieve undefined namespace',
+                E_USER_WARNING);
+            return;
+        }
+        return $this->conf[$namespace];
+    }
+    
     /**
      * Sets a value to configuration.
      * @param $namespace String namespace
      * @param $key String key
      * @param $value Mixed value
      */
-    function set($namespace, $key, $value) {
+    function set($namespace, $key, $value, $from_alias = false) {
         if (!isset($this->def->info[$namespace][$key])) {
             trigger_error('Cannot set undefined directive to value',
                 E_USER_WARNING);
             return;
         }
+        if ($this->def->info[$namespace][$key]->class == 'alias') {
+            if ($from_alias) {
+                trigger_error('Double-aliases not allowed, please fix '.
+                    'ConfigSchema bug');
+            }
+            $this->set($this->def->info[$namespace][$key]->namespace,
+                       $this->def->info[$namespace][$key]->name,
+                       $value, true);
+            return;
+        }
         $value = $this->def->validate(
                     $value,
                     $this->def->info[$namespace][$key]->type,
@@ -103,23 +149,36 @@ class HTMLPurifier_Config
             return;
         }
         $this->conf[$namespace][$key] = $value;
+        if ($namespace == 'HTML' || $namespace == 'Attr') {
+            // reset HTML definition if relevant attributes changed
+            $this->html_definition = null;
+        }
+        if ($namespace == 'CSS') {
+            $this->css_definition = null;
+        }
     }
     
     /**
-     * Retrieves a copy of the HTML definition.
+     * Retrieves reference to the HTML definition.
+     * @param $raw Return a copy that has not been setup yet. Must be
+     *             called before it's been setup, otherwise won't work.
      */
-    function getHTMLDefinition() {
-        if ($this->html_definition === null) {
-            $this->html_definition = new HTMLPurifier_HTMLDefinition();
-            $this->html_definition->setup($this);
+    function &getHTMLDefinition($raw = false) {
+        if (
+            empty($this->html_definition) || // hasn't ever been setup
+            ($raw && $this->html_definition->setup) // requesting new one
+        ) {
+            $this->html_definition = new HTMLPurifier_HTMLDefinition($this);
+            if ($raw) return $this->html_definition; // no setup!
         }
+        if (!$this->html_definition->setup) $this->html_definition->setup();
         return $this->html_definition;
     }
     
     /**
-     * Retrieves a copy of the CSS definition
+     * Retrieves reference to the CSS definition
      */
-    function getCSSDefinition() {
+    function &getCSSDefinition() {
         if ($this->css_definition === null) {
             $this->css_definition = new HTMLPurifier_CSSDefinition();
             $this->css_definition->setup($this);
@@ -134,6 +193,7 @@ class HTMLPurifier_Config
      */
     function loadArray($config_array) {
         foreach ($config_array as $key => $value) {
+            $key = str_replace('_', '.', $key);
             if (strpos($key, '.') !== false) {
                 // condensed form
                 list($namespace, $directive) = explode('.', $key);
@@ -148,6 +208,15 @@ class HTMLPurifier_Config
         }
     }
     
+    /**
+     * Loads configuration values from an ini file
+     * @param $filename Name of ini file
+     */
+    function loadIni($filename) {
+        $array = parse_ini_file($filename, true);
+        $this->loadArray($array);
+    }
+    
 }
 
-?>
+?>

library/HTMLPurifier/ConfigDef.php

@@ -0,0 +1,10 @@
+<?php
+
+/**
+ * Base class for configuration entity
+ */
+class HTMLPurifier_ConfigDef {
+    var $class = false;
+}
+
+?>

library/HTMLPurifier/ConfigDef/Directive.php

@@ -0,0 +1,74 @@
+<?php
+
+require_once 'HTMLPurifier/ConfigDef.php';
+
+/**
+ * Structure object containing definition of a directive.
+ * @note This structure does not contain default values
+ */
+class HTMLPurifier_ConfigDef_Directive extends HTMLPurifier_ConfigDef
+{
+    
+    var $class = 'directive';
+    
+    function HTMLPurifier_ConfigDef_Directive(
+        $type = null,
+        $descriptions = null,
+        $allow_null = null,
+        $allowed = null,
+        $aliases = null
+    ) {
+        if (        $type !== null)         $this->type = $type;
+        if ($descriptions !== null) $this->descriptions = $descriptions;
+        if (  $allow_null !== null)   $this->allow_null = $allow_null;
+        if (     $allowed !== null)      $this->allowed = $allowed;
+        if (     $aliases !== null)      $this->aliases = $aliases;
+    }
+    
+    /**
+     * Allowed type of the directive. Values are:
+     *      - string
+     *      - istring (case insensitive string)
+     *      - int
+     *      - float
+     *      - bool
+     *      - lookup (array of value => true)
+     *      - list (regular numbered index array)
+     *      - hash (array of key => value)
+     *      - mixed (anything goes)
+     */
+    var $type = 'mixed';
+    
+    /**
+     * Plaintext descriptions of the configuration entity is. Organized by
+     * file and line number, so multiple descriptions are allowed.
+     */
+    var $descriptions = array();
+    
+    /**
+     * Is null allowed? Has no effect for mixed type.
+     * @bool
+     */
+    var $allow_null = false;
+    
+    /**
+     * Lookup table of allowed values of the element, bool true if all allowed.
+     */
+    var $allowed = true;
+    
+    /**
+     * Hash of value aliases, i.e. values that are equivalent.
+     */
+    var $aliases = array();
+    
+    /**
+     * Adds a description to the array
+     */
+    function addDescription($file, $line, $description) {
+        if (!isset($this->descriptions[$file])) $this->descriptions[$file] = array();
+        $this->descriptions[$file][$line] = $description;
+    }
+    
+}
+
+?>

library/HTMLPurifier/ConfigDef/DirectiveAlias.php

@@ -0,0 +1,27 @@
+<?php
+
+require_once 'HTMLPurifier/ConfigDef.php';
+
+/**
+ * Structure object describing a directive alias
+ */
+class HTMLPurifier_ConfigDef_DirectiveAlias extends HTMLPurifier_ConfigDef
+{
+    var $class = 'alias';
+    
+    /**
+     * Namespace being aliased to
+     */
+    var $namespace;
+    /**
+     * Directive being aliased to
+     */
+    var $name;
+    
+    function HTMLPurifier_ConfigDef_DirectiveAlias($namespace, $name) {
+        $this->namespace = $namespace;
+        $this->name = $name;
+    }
+}
+
+?>

library/HTMLPurifier/ConfigDef/Namespace.php

@@ -0,0 +1,23 @@
+<?php
+
+require_once 'HTMLPurifier/ConfigDef.php';
+
+/**
+ * Structure object describing of a namespace
+ */
+class HTMLPurifier_ConfigDef_Namespace extends HTMLPurifier_ConfigDef {
+    
+    function HTMLPurifier_ConfigDef_Namespace($description = null) {
+        $this->description = $description;
+    }
+    
+    var $class = 'namespace';
+    
+    /**
+     * String description of what kinds of directives go in this namespace.
+     */
+    var $description;
+    
+}
+
+?>

library/HTMLPurifier/ConfigSchema.php

@@ -1,6 +1,10 @@
 <?php
 
 require_once 'HTMLPurifier/Error.php';
+require_once 'HTMLPurifier/ConfigDef.php';
+require_once 'HTMLPurifier/ConfigDef/Namespace.php';
+require_once 'HTMLPurifier/ConfigDef/Directive.php';
+require_once 'HTMLPurifier/ConfigDef/DirectiveAlias.php';
 
 /**
  * Configuration definition, defines directives and their defaults.
@@ -67,6 +71,7 @@ class HTMLPurifier_ConfigSchema {
     
     /**
      * Retrieves an instance of the application-wide configuration definition.
+     * @static
      */
     function &instance($prototype = null) {
         static $instance;
@@ -81,6 +86,7 @@ class HTMLPurifier_ConfigSchema {
     
     /**
      * Defines a directive for configuration
+     * @static
      * @warning Will fail of directive's namespace is defined
      * @param $namespace Namespace the directive is in
      * @param $name Key of directive
@@ -104,6 +110,11 @@ class HTMLPurifier_ConfigSchema {
                 E_USER_ERROR);
             return;
         }
+        if (empty($description)) {
+            trigger_error('Description must be non-empty',
+                E_USER_ERROR);
+            return;
+        }
         if (isset($def->info[$namespace][$name])) {
             if (
                 $def->info[$namespace][$name]->type !== $type ||
@@ -131,7 +142,7 @@ class HTMLPurifier_ConfigSchema {
                 return;
             }
             $def->info[$namespace][$name] =
-                new HTMLPurifier_ConfigEntity_Directive();
+                new HTMLPurifier_ConfigDef_Directive();
             $def->info[$namespace][$name]->type = $type;
             $def->info[$namespace][$name]->allow_null = $allow_null;
             $def->defaults[$namespace][$name]   = $default;
@@ -144,6 +155,7 @@ class HTMLPurifier_ConfigSchema {
     
     /**
      * Defines a namespace for directives to be put into.
+     * @static
      * @param $namespace Namespace's name
      * @param $description Description of the namespace
      */
@@ -158,8 +170,13 @@ class HTMLPurifier_ConfigSchema {
                 E_USER_ERROR);
             return;
         }
+        if (empty($description)) {
+            trigger_error('Description must be non-empty',
+                E_USER_ERROR);
+            return;
+        }
         $def->info[$namespace] = array();
-        $def->info_namespace[$namespace] = new HTMLPurifier_ConfigEntity_Namespace();
+        $def->info_namespace[$namespace] = new HTMLPurifier_ConfigDef_Namespace();
         $def->info_namespace[$namespace]->description = $description;
         $def->defaults[$namespace] = array();
     }
@@ -169,6 +186,7 @@ class HTMLPurifier_ConfigSchema {
      * 
      * Directive value aliases are convenient for developers because it lets
      * them set a directive to several values and get the same result.
+     * @static
      * @param $namespace Directive's namespace
      * @param $name Name of Directive
      * @param $alias Name of aliased value
@@ -200,6 +218,7 @@ class HTMLPurifier_ConfigSchema {
     
     /**
      * Defines a set of allowed values for a directive.
+     * @static
      * @param $namespace Namespace of directive
      * @param $name Name of directive
      * @param $allowed_values Arraylist of allowed values
@@ -211,12 +230,66 @@ class HTMLPurifier_ConfigSchema {
                 E_USER_ERROR);
             return;
         }
-        if ($def->info[$namespace][$name]->allowed === true) {
-            $def->info[$namespace][$name]->allowed = array();
+        $directive =& $def->info[$namespace][$name];
+        $type = $directive->type;
+        if ($type != 'string' && $type != 'istring') {
+            trigger_error('Cannot define allowed values for directive whose type is not string',
+                E_USER_ERROR);
+            return;
+        }
+        if ($directive->allowed === true) {
+            $directive->allowed = array();
         }
         foreach ($allowed_values as $value) {
-            $def->info[$namespace][$name]->allowed[$value] = true;
+            $directive->allowed[$value] = true;
         }
+        if ($def->defaults[$namespace][$name] !== null &&
+            !isset($directive->allowed[$def->defaults[$namespace][$name]])) {
+            trigger_error('Default value must be in allowed range of variables',
+                E_USER_ERROR);
+            $directive->allowed = true; // undo undo!
+            return;
+        }
+    }
+    
+    /**
+     * Defines a directive alias for backwards compatibility
+     * @static
+     * @param $namespace
+     * @param $name Directive that will be aliased
+     * @param $new_namespace
+     * @param $new_name Directive that the alias will be to
+     */
+    function defineAlias($namespace, $name, $new_namespace, $new_name) {
+        $def =& HTMLPurifier_ConfigSchema::instance();
+        if (!isset($def->info[$namespace])) {
+            trigger_error('Cannot define directive alias in undefined namespace',
+                E_USER_ERROR);
+            return;
+        }
+        if (!ctype_alnum($name)) {
+            trigger_error('Directive name must be alphanumeric',
+                E_USER_ERROR);
+            return;
+        }
+        if (isset($def->info[$namespace][$name])) {
+            trigger_error('Cannot define alias over directive',
+                E_USER_ERROR);
+            return;
+        }
+        if (!isset($def->info[$new_namespace][$new_name])) {
+            trigger_error('Cannot define alias to undefined directive',
+                E_USER_ERROR);
+            return;
+        }
+        if ($def->info[$new_namespace][$new_name]->class == 'alias') {
+            trigger_error('Cannot define alias to alias',
+                E_USER_ERROR);
+            return;
+        }
+        $def->info[$namespace][$name] =
+            new HTMLPurifier_ConfigDef_DirectiveAlias(
+                $new_namespace, $new_name);
     }
     
     /**
@@ -247,11 +320,26 @@ class HTMLPurifier_ConfigSchema {
             case 'bool':
                 if (is_int($var) && ($var === 0 || $var === 1)) {
                     $var = (bool) $var;
+                } elseif (is_string($var)) {
+                    if ($var == 'on' || $var == 'true' || $var == '1') {
+                        $var = true;
+                    } elseif ($var == 'off' || $var == 'false' || $var == '0') {
+                        $var = false;
+                    } else {
+                        break;
+                    }
                 } elseif (!is_bool($var)) break;
                 return $var;
             case 'list':
             case 'hash':
             case 'lookup':
+                if (is_string($var)) {
+                    // simplistic string to array method that only works
+                    // for simple lists of tag names or alphanumeric characters
+                    $var = explode(',',$var);
+                    // remove spaces
+                    foreach ($var as $i => $j) $var[$i] = trim($j);
+                }
                 if (!is_array($var)) break;
                 $keys = array_keys($var);
                 if ($keys === array_keys($keys)) {
@@ -295,74 +383,4 @@ class HTMLPurifier_ConfigSchema {
     }
 }
 
-/**
- * Base class for configuration entity
- */
-class HTMLPurifier_ConfigEntity {}
-
-/**
- * Structure object describing of a namespace
- */
-class HTMLPurifier_ConfigEntity_Namespace extends HTMLPurifier_ConfigEntity {
-    
-    /**
-     * String description of what kinds of directives go in this namespace.
-     */
-    var $description;
-    
-}
-
-/**
- * Structure object containing definition of a directive.
- * @note This structure does not contain default values
- */
-class HTMLPurifier_ConfigEntity_Directive extends HTMLPurifier_ConfigEntity
-{
-    
-    /**
-     * Hash of value aliases, i.e. values that are equivalent.
-     */
-    var $aliases = array();
-    
-    /**
-     * Lookup table of allowed values of the element, bool true if all allowed.
-     */
-    var $allowed = true;
-    
-    /**
-     * Allowed type of the directive. Values are:
-     *      - string
-     *      - istring (case insensitive string)
-     *      - int
-     *      - float
-     *      - bool
-     *      - lookup (array of value => true)
-     *      - list (regular numbered index array)
-     *      - hash (array of key => value)
-     *      - mixed (anything goes)
-     */
-    var $type = 'mixed';
-    
-    /**
-     * Is null allowed? Has no affect for mixed type.
-     * @bool
-     */
-    var $allow_null = false;
-    
-    /**
-     * Plaintext descriptions of the configuration entity is. Organized by
-     * file and line number, so multiple descriptions are allowed.
-     */
-    var $descriptions = array();
-    
-    /**
-     * Adds a description to the array
-     */
-    function addDescription($file, $line, $description) {
-        if (!isset($this->descriptions[$file])) $this->descriptions[$file] = array();
-        $this->descriptions[$file][$line] = $description;
-    }
-    
-}
-
-?>
+?>

library/HTMLPurifier/ContentSets.php

@@ -0,0 +1,148 @@
+<?php
+
+// common defs that we'll support by default
+require_once 'HTMLPurifier/ChildDef.php';
+require_once 'HTMLPurifier/ChildDef/Empty.php';
+require_once 'HTMLPurifier/ChildDef/Required.php';
+require_once 'HTMLPurifier/ChildDef/Optional.php';
+
+class HTMLPurifier_ContentSets
+{
+    
+    /**
+     * List of content set strings (pipe seperators) indexed by name.
+     * @public
+     */
+    var $info = array();
+    
+    /**
+     * List of content set lookups (element => true) indexed by name.
+     * @note This is in HTMLPurifier_HTMLDefinition->info_content_sets
+     * @public
+     */
+    var $lookup = array();
+    
+    /**
+     * Synchronized list of defined content sets (keys of info)
+     */
+    var $keys = array();
+    /**
+     * Synchronized list of defined content values (values of info)
+     */
+    var $values = array();
+    
+    /**
+     * Merges in module's content sets, expands identifiers in the content
+     * sets and populates the keys, values and lookup member variables.
+     * @param $modules List of HTMLPurifier_HTMLModule
+     */
+    function HTMLPurifier_ContentSets($modules) {
+        if (!is_array($modules)) $modules = array($modules);
+        // populate content_sets based on module hints
+        // sorry, no way of overloading
+        foreach ($modules as $module_i => $module) {
+            foreach ($module->content_sets as $key => $value) {
+                if (isset($this->info[$key])) {
+                    // add it into the existing content set
+                    $this->info[$key] = $this->info[$key] . ' | ' . $value;
+                } else {
+                    $this->info[$key] = $value;
+                }
+            }
+        }
+        // perform content_set expansions
+        $this->keys = array_keys($this->info);
+        foreach ($this->info as $i => $set) {
+            // only performed once, so infinite recursion is not
+            // a problem
+            $this->info[$i] =
+                str_replace(
+                    $this->keys,
+                    // must be recalculated each time due to
+                    // changing substitutions
+                    array_values($this->info),
+                $set);
+        }
+        $this->values = array_values($this->info);
+        
+        // generate lookup tables
+        foreach ($this->info as $name => $set) {
+            $this->lookup[$name] = $this->convertToLookup($set);
+        }
+    }
+    
+    /**
+     * Accepts a definition; generates and assigns a ChildDef for it
+     * @param $def HTMLPurifier_ElementDef reference
+     * @param $module Module that defined the ElementDef
+     */
+    function generateChildDef(&$def, $module) {
+        if (!empty($def->child)) return; // already done!
+        $content_model = $def->content_model;
+        if (is_string($content_model)) {
+            $def->content_model = str_replace(
+                $this->keys, $this->values, $content_model);
+        }
+        $def->child = $this->getChildDef($def, $module);
+    }
+    
+    /**
+     * Instantiates a ChildDef based on content_model and content_model_type
+     * member variables in HTMLPurifier_ElementDef
+     * @note This will also defer to modules for custom HTMLPurifier_ChildDef
+     *       subclasses that need content set expansion
+     * @param $def HTMLPurifier_ElementDef to have ChildDef extracted
+     * @return HTMLPurifier_ChildDef corresponding to ElementDef
+     */
+    function getChildDef($def, $module) {
+        $value = $def->content_model;
+        if (is_object($value)) {
+            trigger_error(
+                'Literal object child definitions should be stored in '.
+                'ElementDef->child not ElementDef->content_model',
+                E_USER_NOTICE
+            );
+            return $value;
+        }
+        switch ($def->content_model_type) {
+            case 'required':
+                return new HTMLPurifier_ChildDef_Required($value);
+            case 'optional':
+                return new HTMLPurifier_ChildDef_Optional($value);
+            case 'empty':
+                return new HTMLPurifier_ChildDef_Empty();
+            case 'custom':
+                return new HTMLPurifier_ChildDef_Custom($value);
+        }
+        // defer to its module
+        $return = false;
+        if ($module->defines_child_def) { // save a func call
+            $return = $module->getChildDef($def);
+        }
+        if ($return !== false) return $return;
+        // error-out
+        trigger_error(
+            'Could not determine which ChildDef class to instantiate',
+            E_USER_ERROR
+        );
+        return false;
+    }
+    
+    /**
+     * Converts a string list of elements separated by pipes into
+     * a lookup array.
+     * @param $string List of elements
+     * @return Lookup array of elements
+     */
+    function convertToLookup($string) {
+        $array = explode('|', str_replace(' ', '', $string));
+        $ret = array();
+        foreach ($array as $i => $k) {
+            $ret[$k] = true;
+        }
+        return $ret;
+    }
+    
+}
+
+?>

library/HTMLPurifier/ElementDef.php

@@ -0,0 +1,122 @@
+<?php
+
+/**
+ * Structure that stores an HTML element definition. Used by
+ * HTMLPurifier_HTMLDefinition and HTMLPurifier_HTMLModule.
+ */
+class HTMLPurifier_ElementDef
+{
+    
+    /**
+     * Does the definition work by itself, or is it created solely
+     * for the purpose of merging into another definition?
+     */
+    var $standalone = true;
+    
+    /**
+     * Associative array of attribute name to HTMLPurifier_AttrDef
+     * @note Before being processed by HTMLPurifier_AttrCollections
+     *       when modules are finalized during
+     *       HTMLPurifier_HTMLDefinition->setup(), this array may also
+     *       contain an array at index 0 that indicates which attribute
+     *       collections to load into the full array. It may also
+     *       contain string indentifiers in lieu of HTMLPurifier_AttrDef,
+     *       see HTMLPurifier_AttrTypes on how they are expanded during
+     *       HTMLPurifier_HTMLDefinition->setup() processing.
+     * @public
+     */
+    var $attr = array();
+    
+    /**
+     * Indexed list of tag's HTMLPurifier_AttrTransform to be done before validation
+     * @public
+     */
+    var $attr_transform_pre = array();
+    
+    /**
+     * Indexed list of tag's HTMLPurifier_AttrTransform to be done after validation
+     * @public
+     */
+    var $attr_transform_post = array();
+    
+    
+    
+    /**
+     * HTMLPurifier_ChildDef of this tag.
+     * @public
+     */
+    var $child;
+    
+    /**
+     * Abstract string representation of internal ChildDef rules. See
+     * HTMLPurifier_ContentSets for how this is parsed and then transformed
+     * into an HTMLPurifier_ChildDef.
+     * @public
+     */
+    var $content_model;
+    
+    /**
+     * Value of $child->type, used to determine which ChildDef to use,
+     * used in combination with $content_model.
+     * @public
+     */
+    var $content_model_type;
+    
+    
+    
+    /**
+     * Lookup table of tags that close this tag. Used during parsing
+     * to make sure we don't attempt to nest unclosed tags.
+     * @public
+     */
+    var $auto_close = array();
+    
+    /**
+     * Does the element have a content model (#PCDATA | Inline)*? This
+     * is important for chameleon ins and del processing in 
+     * HTMLPurifier_ChildDef_Chameleon. Dynamically set: modules don't
+     * have to worry about this one.
+     * @public
+     */
+    var $descendants_are_inline;
+    
+    /**
+     * Lookup table of tags excluded from all descendants of this tag.
+     * @public
+     */
+    var $excludes = array();
+    
+    /**
+     * Merges the values of another element definition into this one.
+     * Values from the new element def take precedence if a value is
+     * not mergeable.
+     */
+    function mergeIn($def) {
+        
+        // later keys takes precedence
+        foreach($def->attr as $k => $v) {
+            if ($k == 0) {
+                // merge in the includes
+                // sorry, no way to override an include
+                foreach ($v as $v2) {
+                    $def->attr[0][] = $v2;
+                }
+                continue;
+            }
+            $this->attr[$k] = $v;
+        }
+        foreach($def->attr_transform_pre    as $k => $v) $this->attr_transform_pre[$k]  = $v;
+        foreach($def->attr_transform_post   as $k => $v) $this->attr_transform_post[$k] = $v;
+        foreach($def->auto_close            as $k => $v) $this->auto_close[$k]          = $v;
+        foreach($def->excludes              as $k => $v) $this->excludes[$k]            = $v;
+        
+        if(!is_null($def->child)) $this->child = $def->child;
+        if(!empty($def->content_model)) $this->content_model .= ' | ' . $def->content_model;
+        if(!empty($def->content_model_type)) $this->content_model_type = $def->content_model_type;
+        if(!is_null($def->descendants_are_inline)) $this->descendants_are_inline = $def->descendants_are_inline;
+        
+    }
+    
+}
+
+?>

library/HTMLPurifier/Encoder.php

@@ -6,15 +6,29 @@ HTMLPurifier_ConfigSchema::define(
     'Core', 'Encoding', 'utf-8', 'istring', 
     'If for some reason you are unable to convert all webpages to UTF-8, '. 
     'you can use this directive as a stop-gap compatibility change to '. 
-    'let HTMLPurifier deal with non UTF-8 input.  This technique has '. 
+    'let HTML Purifier deal with non UTF-8 input.  This technique has '. 
     'notable deficiencies: absolutely no characters outside of the selected '. 
     'character encoding will be preserved, not even the ones that have '. 
     'been ampersand escaped (this is due to a UTF-8 specific <em>feature</em> '.
     'that automatically resolves all entities), making it pretty useless '.
-    'for anything except the most I18N-blind applications.  This directive '.
+    'for anything except the most I18N-blind applications, although '.
+    '%Core.EscapeNonASCIICharacters offers fixes this trouble with '.
+    'another tradeoff. This directive '.
     'only accepts ISO-8859-1 if iconv is not enabled.'
 );
 
+HTMLPurifier_ConfigSchema::define(
+    'Core', 'EscapeNonASCIICharacters', false, 'bool',
+    'This directive overcomes a deficiency in %Core.Encoding by blindly '.
+    'converting all non-ASCII characters into decimal numeric entities before '.
+    'converting it to its native encoding. This means that even '.
+    'characters that can be expressed in the non-UTF-8 encoding will '.
+    'be entity-ized, which can be a real downer for encodings like Big5. '.
+    'It also assumes that the ASCII repetoire is available, although '.
+    'this is the case for almost all encodings. Anyway, use UTF-8! This '.
+    'directive has been available since 1.4.0.'
+);
+
 if ( !function_exists('iconv') ) {
     // only encodings with native PHP support
     HTMLPurifier_ConfigSchema::defineAllowedValues(
@@ -38,16 +52,25 @@ HTMLPurifier_ConfigSchema::define(
 
 /**
  * A UTF-8 specific character encoder that handles cleaning and transforming.
+ * @note All functions in this class should be static.
  */
 class HTMLPurifier_Encoder
 {
     
+    /**
+     * Constructor throws fatal error if you attempt to instantiate class
+     */
+    function HTMLPurifier_Encoder() {
+        trigger_error('Cannot instantiate encoder, call methods statically', E_USER_ERROR);
+    }
+    
     /**
      * Cleans a UTF-8 string for well-formedness and SGML validity
      * 
      * It will parse according to UTF-8 and return a valid UTF8 string, with
      * non-SGML codepoints excluded.
      * 
+     * @static
      * @note Just for reference, the non-SGML code points are 0 to 31 and
      *       127 to 159, inclusive.  However, we allow code points 9, 10
      *       and 13, which are the tab, line feed and carriage return
@@ -225,6 +248,7 @@ class HTMLPurifier_Encoder
     
     /**
      * Translates a Unicode codepoint into its corresponding UTF-8 character.
+     * @static
      * @note Based on Feyd's function at
      *       <http://forums.devnetwork.net/viewtopic.php?p=191404#191404>,
      *       which is in public domain.
@@ -288,6 +312,7 @@ class HTMLPurifier_Encoder
     
     /**
      * Converts a string to UTF-8 based on configuration.
+     * @static
      */
     function convertToUTF8($str, $config, &$context) {
         static $iconv = null;
@@ -299,10 +324,12 @@ class HTMLPurifier_Encoder
         } elseif ($encoding === 'iso-8859-1') {
             return @utf8_encode($str);
         }
+        trigger_error('Encoding not supported', E_USER_ERROR);
     }
     
     /**
      * Converts a string from UTF-8 based on configuration.
+     * @static
      * @note Currently, this is a lossy conversion, with unexpressable
      *       characters being omitted.
      */
@@ -311,11 +338,63 @@ class HTMLPurifier_Encoder
         if ($iconv === null) $iconv = function_exists('iconv');
         $encoding = $config->get('Core', 'Encoding');
         if ($encoding === 'utf-8') return $str;
+        if ($config->get('Core', 'EscapeNonASCIICharacters')) {
+            $str = HTMLPurifier_Encoder::convertToASCIIDumbLossless($str);
+        }
         if ($iconv && !$config->get('Test', 'ForceNoIconv')) {
             return @iconv('utf-8', $encoding . '//IGNORE', $str);
         } elseif ($encoding === 'iso-8859-1') {
             return @utf8_decode($str);
         }
+        trigger_error('Encoding not supported', E_USER_ERROR);
+    }
+    
+    /**
+     * Lossless (character-wise) conversion of HTML to ASCII
+     * @static
+     * @param $str UTF-8 string to be converted to ASCII
+     * @returns ASCII encoded string with non-ASCII character entity-ized
+     * @warning Adapted from MediaWiki, claiming fair use: this is a common
+     *       algorithm. If you disagree with this license fudgery,
+     *       implement it yourself.
+     * @note Uses decimal numeric entities since they are best supported.
+     * @note This is a DUMB function: it has no concept of keeping
+     *       character entities that the projected character encoding
+     *       can allow. We could possibly implement a smart version
+     *       but that would require it to also know which Unicode
+     *       codepoints the charset supported (not an easy task).
+     * @note Sort of with cleanUTF8() but it assumes that $str is
+     *       well-formed UTF-8
+     */
+    function convertToASCIIDumbLossless($str) {
+        $bytesleft = 0;
+        $result = '';
+        $working = 0;
+        $len = strlen($str);
+        for( $i = 0; $i < $len; $i++ ) {
+            $bytevalue = ord( $str[$i] );
+            if( $bytevalue <= 0x7F ) { //0xxx xxxx
+                $result .= chr( $bytevalue );
+                $bytesleft = 0;
+            } elseif( $bytevalue <= 0xBF ) { //10xx xxxx
+                $working = $working << 6;
+                $working += ($bytevalue & 0x3F);
+                $bytesleft--;
+                if( $bytesleft <= 0 ) {
+                    $result .= "&#" . $working . ";";
+                }
+            } elseif( $bytevalue <= 0xDF ) { //110x xxxx
+                $working = $bytevalue & 0x1F;
+                $bytesleft = 1;
+            } elseif( $bytevalue <= 0xEF ) { //1110 xxxx
+                $working = $bytevalue & 0x0F;
+                $bytesleft = 2;
+            } else { //1111 0xxx
+                $working = $bytevalue & 0x07;
+                $bytesleft = 3;
+            }
+        }
+        return $result;
     }
     
     

library/HTMLPurifier/EntityLookup.php

@@ -26,6 +26,7 @@ class HTMLPurifier_EntityLookup {
     
     /**
      * Retrieves sole instance of the object.
+     * @static
      * @param Optional prototype of custom lookup table to overload with.
      */
     function instance($prototype = false) {

library/HTMLPurifier/Filter.php

@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * Represents a pre or post processing filter on HTML Purifier's output
+ * 
+ * Sometimes, a little ad-hoc fixing of HTML has to be done before
+ * it gets sent through HTML Purifier: you can use filters to acheive
+ * this effect. For instance, YouTube videos can be preserved using
+ * this manner. You could have used a decorator for this task, but
+ * PHP's support for them is not terribly robust, so we're going
+ * to just loop through the filters.
+ * 
+ * Filters should be exited first in, last out. If there are three filters,
+ * named 1, 2 and 3, the order of execution should go 1->preFilter,
+ * 2->preFilter, 3->preFilter, purify, 3->postFilter, 2->postFilter,
+ * 1->postFilter.
+ */
+
+class HTMLPurifier_Filter
+{
+    
+    /**
+     * Name of the filter for identification purposes
+     */
+    var $name;
+    
+    /**
+     * Pre-processor function, handles HTML before HTML Purifier 
+     */
+    function preFilter($html, $config, &$context) {}
+    
+    /**
+     * Post-processor function, handles HTML after HTML Purifier
+     */
+    function postFilter($html, $config, &$context) {}
+    
+}
+
+?>

library/HTMLPurifier/Filter/YouTube.php

@@ -0,0 +1,34 @@
+<?php
+
+require_once 'HTMLPurifier/Filter.php';
+
+class HTMLPurifier_Filter_YouTube extends HTMLPurifier_Filter
+{
+    
+    var $name = 'YouTube preservation';
+    
+    function preFilter($html, $config, &$context) {
+        $pre_regex = '#<object[^>]+>.+?'.
+            'http://www.youtube.com/v/([A-Za-z0-9\-_]+).+?</object>#s';
+        $pre_replace = '<span class="youtube-embed">\1</span>';
+        return preg_replace($pre_regex, $pre_replace, $html);
+    }
+    
+    function postFilter($html, $config, &$context) {
+        $post_regex = '#<span class="youtube-embed">([A-Za-z0-9\-_]+)</span>#';
+        $post_replace = '<object width="425" height="350" '.
+            'data="http://www.youtube.com/v/\1">'.
+            '<param name="movie" value="http://www.youtube.com/v/\1"></param>'.
+            '<param name="wmode" value="transparent"></param>'.
+            '<!--[if IE]>'.
+            '<embed src="http://www.youtube.com/v/\1"'.
+            'type="application/x-shockwave-flash"'.
+            'wmode="transparent" width="425" height="350" />'.
+            '<![endif]-->'.
+            '</object>';
+        return preg_replace($post_regex, $post_replace, $html);
+    }
+    
+}
+
+?>

library/HTMLPurifier/Generator.php

@@ -104,14 +104,14 @@ class HTMLPurifier_Generator
     function generateFromToken($token) {
         if (!isset($token->type)) return '';
         if ($token->type == 'start') {
-            $attr = $this->generateAttributes($token->attributes);
+            $attr = $this->generateAttributes($token->attr);
             return '<' . $token->name . ($attr ? ' ' : '') . $attr . '>';
             
         } elseif ($token->type == 'end') {
             return '</' . $token->name . '>';
             
         } elseif ($token->type == 'empty') {
-            $attr = $this->generateAttributes($token->attributes);
+            $attr = $this->generateAttributes($token->attr);
              return '<' . $token->name . ($attr ? ' ' : '') . $attr .
                 ( $this->_xhtml ? ' /': '' )
                 . '>';