Release 2.1.0, merged in 1255 to HEAD.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/branches/strict@1368 48356398-32a2-884e-a903-53898d9a118a

Doxyfile

@@ -4,7 +4,7 @@
 # Project related configuration options
 #---------------------------------------------------------------------------
 PROJECT_NAME           = HTML Purifier
-PROJECT_NUMBER         = 2.0.0
+PROJECT_NUMBER         = 2.1.1
 OUTPUT_DIRECTORY       = "C:/Documents and Settings/Edward/My Documents/My Webs/htmlpurifier/docs/doxygen"
 CREATE_SUBDIRS         = NO
 OUTPUT_LANGUAGE        = English

INSTALL

@@ -1,4 +1,3 @@
-
 Install
     How to install HTML Purifier
 
@@ -9,6 +8,8 @@ down to the bottom of this INSTALL document to see the code, but you really
 should make sure a few things are properly done.
 
 
+
+
 1.  Compatibility
 
 HTML Purifier works in both PHP 4 and PHP 5, from PHP 4.3.2 and up. It has no
@@ -48,7 +49,7 @@ be standards compliant.  HTML Purifier can deal with these doctypes:
 * XHTML 1.0 Strict
 * HTML 4.01 Transitional
 * HTML 4.01 Strict
-* XHTML 1.1 sans Ruby
+* XHTML 1.1 (sans Ruby)
 
 ...and these character encodings:
 
@@ -69,6 +70,10 @@ the doctype from this code in your HTML documents:
 For legacy codebases these declarations may be missing.  If that is the case,
 STOP, and read docs/enduser-utf8.html
 
+
+
+
+
 You may currently be vulnerable to XSS and other security threats, and HTML
 Purifier won't be able to fix that.
 
@@ -112,8 +117,12 @@ websites):
 Note that HTML Purifier's support for non-Unicode encodings is crippled by the
 fact that any character not supported by that encoding will be silently
 dropped, EVEN if it is ampersand escaped.  If you want to work around
-this, you are welcome to read docs/enduser-utf8.html for a workaround,
-but please be cognizant of the issues the "solution" creates.
+this, you are welcome to read docs/enduser-utf8.html for a fix,
+but please be cognizant of the issues the "solution" creates (for this
+reason, I do not include the solution in this document).
+
+
+
 
 
 
@@ -126,6 +135,7 @@ XHTML output like this:
 
 Other supported doctypes include:
 
+
     * HTML 4.01 Strict
     * HTML 4.01 Transitional
     * XHTML 1.0 Strict
@@ -139,7 +149,9 @@ Other supported doctypes include:
 There are more configuration directives which can be read about
 here: <http://htmlpurifier.org/live/configdoc/plain.html>  They're a bit boring,
 but they can help out for those of you who like to exert maximum control over
-your code.
+your code.  Some of the more interesting ones are configurable at the
+demo <http://htmlpurifier.org/demo.php> and are well worth looking into
+for your own system.
 
 
 
@@ -156,13 +168,15 @@ The interface is mind-numbingly simple:
     $clean_html = $purifier->purify( $dirty_html );
 
 That's it!  For more examples, check out docs/examples/ (they aren't very
-different though).  Also, SLOW gives advice on what to do if HTML Purifier
-is slowing down your application.
+different though).  Also, docs/enduser-slow.html gives advice on what to
+do if HTML Purifier is slowing down your application.
 
 
 
 6.   Quick install
 
+First, make sure library/HTMLPurifier/DefinitionCache/Serializer is
+writable by the webserver (see Section 7: Caching below for details).
 If your website is in UTF-8 and XHTML Transitional, use this code:
 
 <?php
@@ -189,6 +203,36 @@ If your website is in a different encoding or doctype, use this code:
 
 7. Caching
 
-HTML Purifier generates some cache files to speed up its execution. For
-maximum performance, make sure that library/HTMLPurifier/DefinitionCache/Serializer
-is writeable by the webserver.
+HTML Purifier generates some cache files (generally one or two) to speed up
+its execution. For maximum performance, make sure that
+library/HTMLPurifier/DefinitionCache/Serializer is writeable by the webserver.
+
+If you are in the library/ folder of HTML Purifier, you can set the
+appropriate permissions using:
+
+    chmod -R 0755 HTMLPurifier/DefinitionCache/Serializer
+
+If the above command doesn't work, you may need to assign write permissions
+to all. This may be necessary if your webserver runs as nobody, but is
+not recommended since it means any other user can write files in the
+directory. Use:
+
+    chmod -R 0777 HTMLPurifier/DefinitionCache/Serializer
+
+You can also chmod files via your FTP client; this option
+is usually accessible by right clicking the corresponding directory and
+then selecting "chmod" or "file permissions".
+
+Starting with 2.0.1, HTML Purifier will generate friendly error messages
+that will tell you exactly what you have to chmod the directory to, if in doubt,
+follow its advice.
+
+If you are unable or unwilling to give write permissions to the cache
+directory, you can either disable the cache (and suffer a performance
+hit):
+
+    $config->set('Core', 'DefinitionCache', null);
+
+Or move the cache directory somewhere else (no trailing slash):
+
+    $config->set('Cache', 'SerializerPath', '/home/user/absolute/path');

NEWS

@@ -9,6 +9,112 @@ NEWS ( CHANGELOG and HISTORY )                                     HTMLPurifier
     . Internal change
 ==========================
 
+2.1.1, released 2007-08-04
+- Fix show-stopper bug in %URI.MakeAbsolute functionality
+- Fix PHP4 syntax error in standalone version
+. Add prefix directory to include path for standalone, this prevents
+  other installations from clobbering the standalone's URI schemes
+. Single test methods can be invoked by prefixing with __only
+
+2.1.0, released 2007-08-02
+# flush-htmldefinition-cache.php superseded in favor of a generic
+  flush-definition-cache.php script, you can clear a specific cache
+  by passing its name as a parameter to the script
+! Phorum mod implemented for HTML Purifier
+! With %Core.AggressivelyFixLt, <3 and similar emoticons no longer
+  trigger HTML removal in PHP5 (DOMLex). This directive is not necessary
+  for PHP4 (DirectLex).
+! Standalone file now available, which greatly reduces the amount of
+  includes (although there are still a few files that reside in the
+  standalone folder)
+! Relative URIs can now be transformed into their absolute equivalents
+  using %URI.Base and %URI.MakeAbsolute
+! Ruby implemented for XHTML 1.1
+! You can now define custom URI filtering behavior, see enduser-uri-filter.html
+  for more details
+! UTF-8 font names now supported in CSS
+- AutoFormatters emit friendly error messages if tags or attributes they
+  need are not allowed
+- ConfigForm's compactification of directive names is now configurable
+- AutoParagraph autoformatter algorithm refined after field-testing
+- XHTML 1.1 now applies XHTML 1.0 Strict cleanup routines, namely
+  blockquote wrapping
+- Contents of <style> tags removed by default when tags are removed
+. HTMLPurifier_Config->getSerial() implemented, this is extremely useful
+  for output cache invalidation
+. ConfigForm printer now can retrieve CSS and JS files as strings, in
+  case HTML Purifier's directory is not publically accessible
+. Introduce new text/itext configuration directive values: these represent
+  longer strings that would be more appropriately edited with a textarea
+. Allow newlines to act as separators for lists, hashes, lookups and
+  %HTML.Allowed
+. ConfigForm generates textareas instead of text inputs for lists, hashes,
+  lookups, text and itext fields
+. Hidden element content removal genericized: %Core.HiddenElements can
+  be used to customize this behavior, by default <script> and <style> are
+  hidden
+. Added HTMLPURIFIER_PREFIX constant, should be used instead of dirname(__FILE__)
+. Custom ChildDef added to default include list
+. URIScheme reflection improved: will not attempt to include file if class
+  already exists. May clobber autoload, so I need to keep an eye on it
+. ConfigSchema heavily optimized, will only collect information and validate
+  definitions when HTMLPURIFIER_SCHEMA_STRICT is true.
+. AttrDef_URI unit tests and implementation refactored
+. benchmarks/ directory now protected from public view with .htaccess file;
+  run the tests via command line
+. URI scheme is munged off if there is no authority and the scheme is the
+  default one
+. All unit tests inherit from HTMLPurifier_Harness, not UnitTestCase
+. Interface for URIScheme changed
+. Generic URI object to hold components of URI added, most systems involved
+  in URI validation have been migrated to use it
+. Custom filtering for URIs factored out to URIDefinition interface for
+  maximum extensibility
+
+2.0.1, released 2007-06-27
+! Tag auto-closing now based on a ChildDef heuristic rather than a
+  manually set auto_close array; some behavior may change
+! Experimental AutoFormat functionality added: auto-paragraph and
+  linkify your HTML input by setting %AutoFormat.AutoParagraph and
+  %AutoFormat.Linkify to true
+! Newlines normalized internally, and then converted back to the
+  value of PHP_EOL. If this is not desired, set your newline format
+  using %Output.Newline.
+! Beta error collection, messages are implemented for the most generic
+  cases involving Lexing or Strategies
+- Clean up special case code for <script> tags
+- Reorder includes for DefinitionCache decorators, fixes a possible
+  missing class error
+- Fixed bug where manually modified definitions were not saved via cache
+  (mostly harmless, except for the fact that it would be a little slower)
+- Configuration objects with different serials do not clobber each
+  others when revision numbers are unequal
+- Improve Serializer DefinitionCache directory permissions checks
+- DefinitionCache no longer throws errors when it encounters old
+  serial files that do not conform to the current style
+- Stray xmlns attributes removed from configuration documentation
+- configForm.php smoketest no longer has XSS vulnerability due to
+  unescaped print_r output
+- Printer adheres to configuration's directives on output format
+- Fix improperly named form field in ConfigForm printer
+. Rewire some test-cases to swallow errors rather than expect them
+. HTMLDefinition printer updated with some of the new attributes
+. DefinitionCache keys reordered to reflect precedence: version number,
+  hash, then revision number
+. %Core.DefinitionCache renamed to %Cache.DefinitionImpl
+. Interlinking in configuration documentation added using
+  Injector_PurifierLinkify
+. Directives now keep track of aliases to themselves
+. Error collector now requires a severity to be passed, use PHP's internal
+  error constants for this
+. HTMLPurifier_Config::getAllowedDirectivesForForm implemented, allows
+  much easier selective embedding of configuration values
+. Doctype objects now accept public and system DTD identifiers
+. %HTML.Doctype is now constrained by specific values, to specify a custom
+  doctype use new %HTML.CustomDoctype
+. ConfigForm truncates long directives to keep the form small, and does
+  not re-output namespaces
+
 2.0.0, released 2007-06-20
 # Completely refactored HTMLModuleManager, decentralizing safety
   information
@@ -115,6 +221,8 @@ NEWS ( CHANGELOG and HISTORY )                                     HTMLPurifier
   %Attr.IDBlacklistRegexp
 - Error messages are emitted when you attempt to "allow" elements or
   attributes that HTML Purifier does not support
+
+
 - Fix segfault in unit test. The problem is not very reproduceable and
   I don't know what causes it, but a six line patch fixed it.
 

TODO

@@ -1,4 +1,3 @@
-
 TODO List
 
 = KEY ====================
@@ -7,20 +6,13 @@ TODO List
     ? Maybe I'll Do It
 ==========================
 
-2.1 release [Refactor, refactor!]
- # URI validation routines tighter (see docs/dev-code-quality.html) (COMPLEX)
- # Advanced URI filtering schemes (see docs/proposal-new-directives.txt)
- - Configuration profiles: predefined directives set with one func call
- - Implement IDREF support (harder than it seems, since you cannot have
-   IDREFs to non-existent IDs)
- - Allow non-ASCII characters in font names
- - Genericize special cases in RemoveForeignElements
+If no interest is expressed for a feature that may required a considerable
+amount of effort to implement, it may get endlessly delayed. Do not be
+afraid to cast your vote for the next feature to be implemented!
 
 2.2 release [Error'ed]
  # Error logging for filtering/cleanup procedures
-    - Requires I18N facilities to be created first (COMPLEX)
  - XSS-attempt detection
- - More fine-grained control over escaping behavior
 
 2.3 release [Do What I Mean, Not What I Say]
  # Additional support for poorly written HTML
@@ -39,20 +31,17 @@ TODO List
 
 2.4 release [It's All About Trust] (floating)
  # Implement untrusted, dangerous elements/attributes
+ # Implement IDREF support (harder than it seems, since you cannot have
+   IDREFs to non-existent IDs)
 
 3.0 release [Beyond HTML]
  # Legit token based CSS parsing (will require revamping almost every
    AttrDef class)
  # More control over allowed CSS properties (maybe modularize it in the
    same fashion!)
- # 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
+ # Formatters for plaintext
     - Smileys
-    - Linkification for HTML Purifier docs: notably configuration and classes
- - Allow tags to be "armored", an internal flag that protects them
-   from validation and passes them out unharmed
+ - Standardize token armor for all areas of processing
  - 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
@@ -64,12 +53,11 @@ TODO List
     - Hooks for adding custom processors to custom namespaced tags and
       attributes, offer default implementation
     - Lots of documentation and samples
- - XHTML 1.1 support
 
 Ongoing
  - Lots of profiling, make it faster!
  - Plugins for major CMSes (COMPLEX)
-    - WordPress (mostly written, needs beta-testing)
+    - phpBB
     - eFiction
     - more! (look for ones that use WYSIWYGs)
  - Complete basic smoketests
@@ -78,18 +66,22 @@ Unknown release (on a scratch-an-itch basis)
  ? Semi-lossy dumb alternate character encoding transfor
  ? Have 'lang' attribute be checked against official lists, achieved by
    encoding all characters that have string entity equivalents
- - Explain how to use HTML Purifier in non-PHP languages
  - Abstract ChildDef_BlockQuote to work with all elements that only
    allow blocks in them, required or optional
  - Reorganize Unit Tests
-    - Refactor loop tests (esp. AttrDef_URI)
+    - Refactor loop tests: Lexer
  - Reorganize configuration directives (Create more namespaces! Get messy!)
+ - Advanced URI filtering schemes (see docs/proposal-new-directives.txt)
+ - Implement lenient <ruby> child validation
+ - Explain how to use HTML Purifier in non-PHP languages / create
+   a simple command line stub (or complicated?)
 
 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
    patch provided)
  - Pretty-printing HTML, users can use Tidy on the output on entire page
+ - Native content compression, whitespace stripping (don't rely on Tidy, make
+   sure we don't remove from <pre> or related tags): use gzip if this is
+   really important

VERSION

@@ -1 +1 @@
-2.0.0
+2.1.1

WHATSNEW

@@ -1,7 +1,10 @@
-HTML Purifier 2.0 is the culmination of two major architectural changes. 
-The first is Tidy, which enables HTML Purifier to both natively support 
-deprecated elements and also convert them to standards-compliant 
-alternatives. The second is the Advanced API, which enables users to 
-create new elements and attributes with ease. Keeping in line with a 
-commitment to high quality, there are also five esoteric bug-fixes and a 
-plethora of subtle improvements that enhance the library. 
+In version 2.1, HTML Purifier's URI validation and filtering handling
+system has been revamped with a new, extensible URIFilter system. Also
+notable features include preservation of emoticons in PHP5 with
+%Core.AggressivelyFixLt, standalone and lite download versions,
+transforming relative URIs to absolute URIs, Ruby in XHTML 1.1, a Phorum
+mod, and UTF-8 font names.  Notable bug-fixes include refinement of
+the auto-paragraphing algorithm (no longer experimental), better XHTML
+1.1 support and the removal of the contents of <style> elements. Version
+2.1.1 amends a few bugs in some of newly introduced features, namely
+running the standalone download version in PHP4 and %URI.MakeAbsolute.

benchmarks/.htaccess

@@ -0,0 +1 @@
+Deny from all

benchmarks/ProfileDirectLex.php

@@ -15,5 +15,3 @@ $context = new HTMLPurifier_Context();
 for ($i = 0; $i < 10; $i++) {
     $tokens = $lexer->tokenizeHTML($input, $config, $context);
 }
-
-?>

benchmarks/Trace.php

@@ -0,0 +1,12 @@
+<?php
+
+ini_set('xdebug.trace_format', 1);
+ini_set('xdebug.show_mem_delta', true);
+
+xdebug_start_trace(dirname(__FILE__) . '/Trace');
+require_once '../library/HTMLPurifier.auto.php';
+
+$purifier = new HTMLPurifier();
+
+$data = $purifier->purify(file_get_contents('samples/Lexer/4.html'));
+xdebug_stop_trace();

configdoc/generate.php

@@ -18,10 +18,16 @@ TODO:
 if (version_compare('5', PHP_VERSION, '>')) exit('Requires PHP 5 or higher.');
 error_reporting(E_ALL); // probably not possible to use E_STRICT
 
+define('HTMLPURIFIER_SCHEMA_STRICT', true); // description data needs to be collected
+
 // load dual-libraries
 require_once '../library/HTMLPurifier.auto.php';
 require_once 'library/ConfigDoc.auto.php';
 
+$purifier = HTMLPurifier::getInstance(array(
+    'AutoFormat.PurifierLinkify' => true
+));
+
 $schema = HTMLPurifier_ConfigSchema::instance();
 $style = 'plain'; // use $_GET in the future
 $configdoc = new ConfigDoc();
@@ -37,4 +43,3 @@ if (php_sapi_name() != 'cli') {
     echo 'Files generated successfully.';
 }
 
-?>

configdoc/library/ConfigDoc.auto.php

@@ -7,4 +7,3 @@
 set_include_path(dirname(__FILE__) . PATH_SEPARATOR . get_include_path() );
 require_once 'ConfigDoc.php';
 
-?>

configdoc/library/ConfigDoc.php

@@ -36,4 +36,3 @@ class ConfigDoc
     
 }
 
-?>

configdoc/library/ConfigDoc/HTMLXSLTProcessor.php

@@ -36,6 +36,7 @@ class ConfigDoc_HTMLXSLTProcessor
         // fudges for HTML backwards compatibility
         $out = str_replace('/>', ' />', $out); // <br /> not <br/>
         $out = str_replace(' xmlns=""', '', $out); // rm unnecessary xmlns
+        $out = str_replace(' xmlns="http://www.w3.org/1999/xhtml"', '', $out); // rm unnecessary xmlns
         if (class_exists('Tidy')) {
             // cleanup output
             $config = array(
@@ -59,4 +60,3 @@ class ConfigDoc_HTMLXSLTProcessor
     
 }
 
-?>

configdoc/library/ConfigDoc/XMLSerializer.php

@@ -23,4 +23,3 @@ class ConfigDoc_XMLSerializer
     
 }
 
-?>

configdoc/library/ConfigDoc/XMLSerializer/ConfigSchema.php

@@ -50,6 +50,12 @@ class ConfigDoc_XMLSerializer_ConfigSchema extends ConfigDoc_XMLSerializer
                     $dom_document->createElement('name', $name)
                 );
                 
+                $dom_aliases = $dom_document->createElement('aliases');
+                $dom_directive->appendChild($dom_aliases);
+                foreach ($info->directiveAliases as $alias) {
+                    $dom_aliases->appendChild($dom_document->createElement('alias', $alias));
+                }
+                
                 $dom_constraints = $dom_document->createElement('constraints');
                 $dom_directive->appendChild($dom_constraints);
                 
@@ -115,4 +121,3 @@ class ConfigDoc_XMLSerializer_ConfigSchema extends ConfigDoc_XMLSerializer
     
 }
 
-?>

configdoc/library/ConfigDoc/XMLSerializer/Types.php

@@ -24,4 +24,3 @@ class ConfigDoc_XMLSerializer_Types extends ConfigDoc_XMLSerializer
     
 }
 
-?>

configdoc/styles/plain.xsl

@@ -72,8 +72,16 @@
         <xsl:apply-templates />
     </xsl:template>
     <xsl:template match="directive/name">
+        <xsl:apply-templates select="../aliases/alias" mode="anchor" />
         <h3 id="{../@id}"><xsl:value-of select="../@id" /></h3>
     </xsl:template>
+    <xsl:template match="alias" mode="anchor">
+        <a id="{.}"></a>
+    </xsl:template>
+    
+    <!-- Do not pass through -->
+    <xsl:template match="alias"></xsl:template>
+    
     <xsl:template match="directive/constraints">
         <table class="constraints">
             <xsl:apply-templates />
@@ -89,8 +97,20 @@
                     </td>
                 </tr>
             </xsl:if>
+            <xsl:if test="../aliases/alias">
+                <xsl:apply-templates select="../aliases" mode="constraints" />
+            </xsl:if>
         </table>
     </xsl:template>
+    <xsl:template match="directive/aliases" mode="constraints">
+        <th>Aliases:</th>
+        <td>
+            <xsl:for-each select="alias">
+                <xsl:if test="position()&gt;1">, </xsl:if>
+                <xsl:value-of select="." />
+            </xsl:for-each>
+        </td>
+    </xsl:template>
     <xsl:template match="directive//description">
         <div class="description">
             <xsl:copy-of select="div/node()" />

docs/dev-code-quality.txt

@@ -11,8 +11,7 @@ docs/examples/demo.php - ad hoc HTML/PHP soup to the extreme
 
 AttrDef - a lot of duplication, more generic classes need to be created;
 a lot of strtolower() calls, no legit casing
-    Class - doesn't support Unicode characters (fringe); uses regular
-        expressions
+    Class - doesn't support Unicode characters (fringe); uses regular expressions
     Lang - code duplication; premature optimization
     Length - easily mistaken for CSSLength
     URI - multiple regular expressions; missing validation for parts (?)
@@ -22,9 +21,6 @@ ConfigSchema - redefinition is a mess
 Strategy
     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).
     RemoveForeignElements - should be run in parallel with MakeWellFormed
 URIScheme - needs to have callable generic checks
     mailto - doesn't validate emails, doesn't validate querystring

docs/enduser-customize.html

@@ -17,11 +17,6 @@
 <div id="index">Return to the <a href="index.html">index</a>.</div>
 <div id="home"><a href="http://htmlpurifier.org/">HTML Purifier</a> End-User Documentation</div>
 
-<div id="applicability">
-  This document covers currently unreleased functionality and
-  only applies to recent SVN checkouts.
-</div>
-
 <p>
   You may have heard of the <a href="dev-advanced-api.html">Advanced API</a>.
   If you're interested in reading dry prose and boring functional

docs/enduser-security.txt

@@ -10,9 +10,7 @@ to be effective. Things to remember:
 
 2. IDs: see enduser-id.html for more info
 
-3. Links: document pending feature completion
-Rudimentary blacklisting, we should also allow only relative URIs. We
-need a doc to explain the stuff.
+3. URIs: see enduser-uri-filter.html
 
 4. CSS: document pending
 Explain which CSS styles we blocked and why.

docs/enduser-tidy.html

@@ -16,11 +16,6 @@
 <div id="index">Return to the <a href="index.html">index</a>.</div>
 <div id="home"><a href="http://htmlpurifier.org/">HTML Purifier</a> End-User Documentation</div>
 
-<div id="applicability">
-  This document covers currently unreleased functionality and
-  only applies to recent SVN checkouts.
-</div>
-
 <p>You've probably heard of HTML Tidy, Dave Raggett's little piece
 of software that cleans up poorly written HTML.  Let me say it straight
 out:</p>

docs/enduser-uri-filter.html

@@ -0,0 +1,201 @@
+<?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="Tutorial for creating custom URI filters." />
+<link rel="stylesheet" type="text/css" href="style.css" />
+
+<title>URI Filters - HTML Purifier</title>
+
+</head><body>
+
+<h1>URI Filters</h1>
+
+<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://htmlpurifier.org/">HTML Purifier</a> End-User Documentation</div>
+
+<p>
+  This is a quick and dirty document to get you on your way to writing
+  custom URI filters for your own URL filtering needs.  Why would you
+  want to write a URI filter?  If you need URIs your users put into
+  HTML to magically change into a different URI, this is
+  exactly what you need!
+</p>
+
+<h2>Creating the class</h2>
+
+<p>
+  Any URI filter you make will be a subclass of <code>HTMLPurifier_URIFilter</code>.
+  The scaffolding is thus:
+</p>
+
+<pre>class HTMLPurifier_URIFilter_<strong>NameOfFilter</strong> extends HTMLPurifier_URIFilter
+{
+    var $name = '<strong>NameOfFilter</strong>';
+    function prepare($config) {}
+    function filter(&$uri, $config, &$context) {}
+}</pre>
+
+<p>
+  Fill in the variable <code>$name</code> with the name of your filter, and
+  take a look at the two methods. <code>prepare()</code> is an initialization
+  method that is called only once, before any filtering has been done of the
+  HTML. Use it to perform any costly setup work that only needs to be done
+  once. <code>filter()</code> is the guts and innards of our filter:
+  it takes the URI and does whatever needs to be done to it.
+</p>
+
+<p>
+  If you've worked with HTML Purifier, you'll recognize the <code>$config</code>
+  and <code>$context</code> parameters.  On the other hand, <code>$uri</code>
+  is something unique to this section of the application: it's a
+  <code>HTMLPurifier_URI</code> object. The interface is thus:
+</p>
+
+<pre>class HTMLPurifier_URI
+{
+    var $scheme, $userinfo, $host, $port, $path, $query, $fragment;
+    function HTMLPurifier_URI($scheme, $userinfo, $host, $port, $path, $query, $fragment);
+    function toString();
+    function copy();
+    function getSchemeObj($config, &$context);
+    function validate($config, &$context);
+}</pre>
+
+<p>
+  The first three methods are fairly self-explanatory: you have a constructor,
+  a serializer, and a cloner.  Generally, you won't be using them when
+  you are manipulating the URI objects themselves.
+  <code>getSchemeObj()</code> is a special purpose method that returns
+  a <code>HTMLPurifier_URIScheme</code> object corresponding to the specific
+  URI at hand. <code>validate()</code> performs general-purpose validation
+  on the internal components of a URI. Once again, you don't need to
+  worry about these: they've already been handled for you.
+</p>
+
+<h2>URI format</h2>
+
+<p>
+  As a URIFilter, we're interested in the member variables of the URI object.
+</p>
+
+<table class="quick"><tbody>
+  <tr><th>Scheme</th>   <td>The protocol for identifying (and possibly locating) a resource (http, ftp, https)</td></tr>
+  <tr><th>Userinfo</th> <td>User information such as a username (bob)</td></tr>
+  <tr><th>Host</th>     <td>Domain name or IP address of the server (example.com, 127.0.0.1)</td></tr>
+  <tr><th>Port</th>     <td>Network port number for the server (80, 12345)</td></tr>
+  <tr><th>Path</th>     <td>Data that identifies the resource, possibly hierarchical (/path/to, ed@example.com)</td></tr>
+  <tr><th>Query</th>    <td>String of information to be interpreted by the resource (?q=search-term)</td></tr>
+  <tr><th>Fragment</th> <td>Additional information for the resource after retrieval (#bookmark)</td></tr>
+</tbody></table>
+
+<p>
+  Because the URI is presented to us in this form, and not 
+  <code>http://bob@example.com:8080/foo.php?q=string#hash</code>, it saves us
+  a lot of trouble in having to parse the URI every time we want to filter
+  it. For the record, the above URI has the following components:
+</p>
+
+<table class="quick"><tbody>
+  <tr><th>Scheme</th>   <td>http</td></tr>
+  <tr><th>Userinfo</th> <td>bob</td></tr>
+  <tr><th>Host</th>     <td>example.com</td></tr>
+  <tr><th>Port</th>     <td>8080</td></tr>
+  <tr><th>Path</th>     <td>/foo.php</td></tr>
+  <tr><th>Query</th>    <td>q=string</td></tr>
+  <tr><th>Fragment</th> <td>hash</td></tr>
+</tbody></table>
+
+<p>
+  Note that there is no question mark or octothorpe in the query or
+  fragment: these get removed during parsing.
+</p>
+
+<p>
+  With this information, you can get straight to implementing your
+  <code>filter()</code> method. But one more thing...
+</p>
+
+<h2>Return value: Boolean, not URI</h2>
+
+<p>
+  You may have noticed that the URI is being passed in by reference.
+  This means that whatever changes you make to it, those changes will
+  be reflected in the URI object the callee had.  <strong>Do not
+  return the URI object: it is unnecessary and will cause bugs.</strong>
+  Instead, return a boolean value, true if the filtering was successful,
+  or false if the URI is beyond repair and needs to be axed.
+</p>
+
+<p>
+  Let's suppose I wanted to write a filter that de-internationalized domain
+  names by converting them to <a href="http://en.wikipedia.org/wiki/Punycode">Punycode</a>.
+  Assuming that <code>punycode_encode($input)</code> converts <code>$input</code> to
+  Punycode and returns <code>false</code> on failure:
+</p>
+
+<pre>class HTMLPurifier_URIFilter_ConvertIDNToPunycode extends HTMLPurifier_URIFilter
+{
+    var $name = 'ConvertIDNToPunycode';
+    function filter(&$uri, $config, &$context) {
+        if (is_null($uri->host)) return true;
+        if ($uri->host == utf8_decode($uri->host)) {
+            // is ASCII, abort
+            return true;
+        }
+        $host = punycode_encode($uri->host);
+        if ($host === false) return false;
+        $uri->host = $host;
+        return true;
+    }
+}</pre>
+
+<p>
+  Notice I did not <code>return $uri;</code>.
+</p>
+
+<h2>Activating your filter</h2>
+
+<p>
+  Having a filter is all well and good, but you need to tell HTML Purifier
+  to use it. Fortunately, this part's simple:
+</p>
+
+<pre>$uri =& $config->getDefinition('URI');
+$uri->addFilter(new HTMLPurifier_URIFilter_<strong>NameOfFilter</strong>());</pre>
+
+<p>
+  If you want to be really fancy, you can define a configuration directive
+  for your filter and have HTML Purifier automatically manage whether or
+  not your filter gets loaded or not (this is how internal filters manage
+  things):
+</p>
+
+<pre>HTMLPurifier_ConfigSchema::define(
+    'URI', '<strong>NameOfFilter</strong>', false, 'bool',
+    '<strong>What your filter does.</strong>'
+);
+$uri =& $config->getDefinition('URI', true);
+$uri->registerFilter(new HTMLPurifier_URIFilter_<strong>NameOfFilter</strong>());
+</pre>
+
+<p>
+  Now, your filter will only be called when %URI.<strong>NameOfFilter</strong>
+  is set to true.
+</p>
+
+<h2>Examples</h2>
+
+<p>
+  Check the
+  <a href="http://htmlpurifier.org/svnroot/htmlpurifier/trunk/library/HTMLPurifier/URIFilter/">URIFilter</a>
+  directory for more implementation examples, and see <a href="http://htmlpurifier.org/svnroot/htmlpurifier/trunk/docs/proposal-new-directives.txt">the
+  new directives proposal document</a> for ideas on what could be implemented
+  as a filter.
+</p>
+
+<div id="version">$Id$</div>
+
+</body></html>

docs/enduser-utf8.html

@@ -231,7 +231,7 @@ of your real encoding.</p>
     why the character encoding should be explicitly stated. When the
     browser isn't told what the character encoding of a text is, it
     has to guess: and sometimes the guess is wrong. Hackers can manipulate
-    this guess in order to slip XSS pass filters and then fool the
+    this guess in order to slip XSS past filters and then fool the
     browser into executing it as active code. A great example of this
     is the <a href="http://shiflett.org/archive/177">Google UTF-7
     exploit</a>.</p>
@@ -567,10 +567,11 @@ which may be used by POST, and is required when you want to upload
 files.</p>
 
 <p>The following is a summarization of notes from
-<a href="http://ppewww.physics.gla.ac.uk/~flavell/charset/form-i18n.html">
+<a href="http://web.archive.org/web/20060427015200/ppewww.ph.gla.ac.uk/~flavell/charset/form-i18n.html">
 <code>FORM</code> submission and i18n</a>. That document contains lots
 of useful information, but is written in a rambly manner, so
-here I try to get right to the point.</p>
+here I try to get right to the point. (Note: the original has 
+disappeared off the web, so I am linking to the Web Archive copy.)</p>
 
 <h4 id="whyutf8-forms-urlencoded"><code>application/x-www-form-urlencoded</code></h4>
 

docs/examples/basic.php

@@ -20,4 +20,3 @@ $pure_html = $purifier->purify($html);
 
 echo '<pre>' . htmlspecialchars($pure_html) . '</pre>';
 
-?>

docs/index.html

@@ -40,6 +40,9 @@ information for casual developers using HTML Purifier.</p>
 <dt><a href="enduser-customize.html">Customize</a></dt>
 <dd>Tutorial for customizing HTML Purifier's tag and attribute sets.</dd>
 
+<dt><a href="enduser-uri-filter.html">URI Filters</a></dt>
+<dd>Tutorial for creating custom URI filters.</dd>
+
 </dl>
 
 <h2>Development</h2>

docs/proposal-filter-levels.txt

@@ -32,7 +32,7 @@ Here are some fuzzy levels you could set:
 
 One final note: when you start axing tags that are more commonly used, you
 run the risk of accidentally destroying user data, especially if the data
-is incoming from a WYSIWYG eidtor that hasn't been synced accordingly. This may
+is incoming from a WYSIWYG editor that hasn't been synced accordingly. This may
 make forbidden element to text transformations desirable (for example, images).
 
 

docs/proposal-new-directives.txt

@@ -2,7 +2,8 @@
 Configuration Ideas
 
 Here are some theoretical configuration ideas that we could implement some
-time.  Note the naming convention: %Namespace.Directive
+time.  Note the naming convention: %Namespace.Directive. If you want one
+implemented, give us a ring, and we'll move it up the priority chain.
 
 %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
@@ -22,8 +23,6 @@ time.  Note the naming convention: %Namespace.Directive
 %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.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

docs/ref-css-length.txt

@@ -0,0 +1,28 @@
+
+CSS Length Reference
+  To bound, or not to bound, that is the question
+
+It's quite a reasonable request, really, and it's already been implemented
+for HTML.  That is, length bounding.  It makes little sense to let users
+define text blocks that have a font-size of 63,360 inches (that's a mile,
+by the way) or a width of forty-fold the parent container.
+
+But it's a little more complicated then that. There are multiple units
+one can use, and we have to a little unit conversion to get things working.
+Here's what we have:
+
+Absolute:
+    1 in ~= 2.54 cm
+    1 cm = 10 mm
+    1 pt = 1/72 in
+    1 pc = 12 pt
+
+Relative:
+    1 em ~= 10.0667 px
+    1 ex ~= 0.5 em, though Mozilla Firefox says 1 ex = 6px
+    1 px ~= 1 pt
+
+Watch out: font-sizes can also be nested to get successively larger 
+(although I do not relish having to keep track of context font-sizes,
+this may be necessary, especially for some of the more advanced features
+for preventing things like white on white).

docs/style.css

@@ -33,6 +33,9 @@ blockquote .label {font-weight:bold; font-size:1em; margin:0 0 .1em;
 .table thead th:first-child {-moz-border-radius-topleft:1em;}
 .table tbody td {border-bottom:1px solid #CCC; padding-right:0.6em;padding-left:0.6em;}
 
+/* A quick table*/
+table.quick tbody th {text-align:right; padding-right:1em;}
+
 /* Category of the file */
 #filing {font-weight:bold; font-size:smaller; }
 

library/HTMLPurifier.auto.php

@@ -7,4 +7,3 @@
 set_include_path(dirname(__FILE__) . PATH_SEPARATOR . get_include_path() );
 require_once 'HTMLPurifier.php';
 
-?>

library/HTMLPurifier.func.php

@@ -18,4 +18,3 @@ function HTMLPurifier($html, $config = null) {
     return $purifier->purify($html, $config);
 }
 
-?>

library/HTMLPurifier.php

@@ -22,7 +22,7 @@
  */
 
 /*
-    HTML Purifier 2.0.0 - Standards Compliant HTML Filtering
+    HTML Purifier 2.1.1 - Standards Compliant HTML Filtering
     Copyright (C) 2006 Edward Z. Yang
 
     This library is free software; you can redistribute it and/or
@@ -40,6 +40,9 @@
     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+// constants are slow, but we'll make one exception
+define('HTMLPURIFIER_PREFIX', dirname(__FILE__));
+
 // almost every class has an undocumented dependency to these, so make sure
 // they get included
 require_once 'HTMLPurifier/ConfigSchema.php'; // important
@@ -51,16 +54,9 @@ require_once 'HTMLPurifier/Generator.php';
 require_once 'HTMLPurifier/Strategy/Core.php';
 require_once 'HTMLPurifier/Encoder.php';
 
+require_once 'HTMLPurifier/ErrorCollector.php';
 require_once 'HTMLPurifier/LanguageFactory.php';
 
-HTMLPurifier_ConfigSchema::define(
-    'Core', 'Language', 'en', 'string', '
-ISO 639 language code for localizable things in HTML Purifier to use,
-which is mainly error reporting. There is currently only an English (en)
-translation, so this directive is currently useless.
-This directive has been available since 2.0.0.
-');
-
 HTMLPurifier_ConfigSchema::define(
     'Core', 'CollectErrors', false, 'bool', '
 Whether or not to collect errors found while filtering the document. This
@@ -81,7 +77,7 @@ This directive has been available since 2.0.0.
 class HTMLPurifier
 {
     
-    var $version = '2.0.0';
+    var $version = '2.1.1';
     
     var $config;
     var $filters;
@@ -139,15 +135,19 @@ class HTMLPurifier
         
         $context = new HTMLPurifier_Context();
         
+        // our friendly neighborhood generator, all primed with configuration too!
+        $this->generator->generateFromTokens(array(), $config, $context);
+        $context->register('Generator', $this->generator);
+        
         // set up global context variables
         if ($config->get('Core', 'CollectErrors')) {
             // may get moved out if other facilities use it
             $language_factory = HTMLPurifier_LanguageFactory::instance();
-            $language = $language_factory->create($config->get('Core', 'Language'));
+            $language = $language_factory->create($config, $context);
             $context->register('Locale', $language);
             
-            $error_collector = new HTMLPurifier_ErrorCollector();
-            $context->register('ErrorCollector', $language);
+            $error_collector = new HTMLPurifier_ErrorCollector($context);
+            $context->register('ErrorCollector', $error_collector);
         }
         
         $html = HTMLPurifier_Encoder::convertToUTF8($html, $config, $context);
@@ -199,13 +199,13 @@ class HTMLPurifier
     /**
      * Singleton for enforcing just one HTML Purifier in your system
      */
-    function &getInstance($prototype = null) {
+    static function &getInstance($prototype = null) {
         static $htmlpurifier;
         if (!$htmlpurifier || $prototype) {
-            if (is_a($prototype, 'HTMLPurifier')) {
+            if ($prototype instanceof HTMLPurifier) {
                 $htmlpurifier = $prototype;
             } elseif ($prototype) {
-                $htmlpurifier = new HTMLPurifier(HTMLPurifier_Config::create($prototype));
+                $htmlpurifier = new HTMLPurifier($prototype);
             } else {
                 $htmlpurifier = new HTMLPurifier();
             }
@@ -216,4 +216,3 @@ class HTMLPurifier
     
 }
 
-?>

library/HTMLPurifier/AttrCollections.php

@@ -127,4 +127,3 @@ class HTMLPurifier_AttrCollections
     
 }
 
-?>

library/HTMLPurifier/AttrDef.php

@@ -84,4 +84,3 @@ class HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS.php

@@ -66,4 +66,3 @@ class HTMLPurifier_AttrDef_CSS extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/Background.php

@@ -84,4 +84,3 @@ class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/BackgroundPosition.php

@@ -127,4 +127,3 @@ class HTMLPurifier_AttrDef_CSS_BackgroundPosition extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/Border.php

@@ -42,4 +42,3 @@ class HTMLPurifier_AttrDef_CSS_Border extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/Color.php

@@ -98,4 +98,3 @@ class HTMLPurifier_AttrDef_CSS_Color extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/Composite.php

@@ -35,4 +35,3 @@ class HTMLPurifier_AttrDef_CSS_Composite extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/Font.php

@@ -148,4 +148,3 @@ class HTMLPurifier_AttrDef_CSS_Font extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/FontFamily.php

@@ -38,19 +38,24 @@ class HTMLPurifier_AttrDef_CSS_FontFamily extends HTMLPurifier_AttrDef
                 $quote = $font[0];
                 if ($font[$length - 1] !== $quote) continue;
                 $font = substr($font, 1, $length - 2);
+                // double-backslash processing is buggy
+                $font = str_replace("\\$quote", $quote, $font); // de-escape quote
+                $font = str_replace("\\\n", "\n", $font);       // de-escape newlines
             }
-            // process font
+            // $font is a pure representation of the font name
+            
             if (ctype_alnum($font)) {
                 // very simple font, allow it in unharmed
                 $final .= $font . ', ';
                 continue;
             }
-            $nospace = str_replace(array(' ', '.', '!'), '', $font);
-            if (ctype_alnum($nospace)) {
-                // font with spaces in it
+            
+            // complicated font, requires quoting
+            
+            // armor single quotes and new lines
+            $font = str_replace("'", "\\'", $font);
+            $font = str_replace("\n", "\\\n", $font);
             $final .= "'$font', ";
-                continue;
-            }
         }
         $final = rtrim($final, ', ');
         if ($final === '') return false;
@@ -59,4 +64,3 @@ class HTMLPurifier_AttrDef_CSS_FontFamily extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/Length.php

@@ -53,4 +53,3 @@ class HTMLPurifier_AttrDef_CSS_Length extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/ListStyle.php

@@ -77,4 +77,3 @@ class HTMLPurifier_AttrDef_CSS_ListStyle extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/Multiple.php

@@ -55,4 +55,3 @@ class HTMLPurifier_AttrDef_CSS_Multiple extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/Number.php

@@ -58,4 +58,3 @@ class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/Percentage.php

@@ -40,4 +40,3 @@ class HTMLPurifier_AttrDef_CSS_Percentage extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/TextDecoration.php

@@ -34,4 +34,3 @@ class HTMLPurifier_AttrDef_CSS_TextDecoration extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/CSS/URI.php

@@ -15,7 +15,7 @@ class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
 {
     
     function HTMLPurifier_AttrDef_CSS_URI() {
-        $this->HTMLPurifier_AttrDef_URI(true); // always embedded
+        parent::HTMLPurifier_AttrDef_URI(true); // always embedded
     }
     
     function validate($uri_string, $config, &$context) {
@@ -55,4 +55,3 @@ class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
     
 }
 
-?>

library/HTMLPurifier/AttrDef/Enum.php

@@ -63,4 +63,3 @@ class HTMLPurifier_AttrDef_Enum extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/HTML/Bool.php

@@ -27,4 +27,3 @@ class HTMLPurifier_AttrDef_HTML_Bool extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/HTML/Color.php

@@ -32,4 +32,3 @@ class HTMLPurifier_AttrDef_HTML_Color extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/HTML/FrameTarget.php

@@ -31,4 +31,3 @@ class HTMLPurifier_AttrDef_HTML_FrameTarget extends HTMLPurifier_AttrDef_Enum
     
 }
 
-?>

library/HTMLPurifier/AttrDef/HTML/ID.php

@@ -118,4 +118,3 @@ class HTMLPurifier_AttrDef_HTML_ID extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/HTML/Length.php

@@ -41,4 +41,3 @@ class HTMLPurifier_AttrDef_HTML_Length extends HTMLPurifier_AttrDef_HTML_Pixels
     
 }
 
-?>

library/HTMLPurifier/AttrDef/HTML/LinkTypes.php

@@ -70,4 +70,3 @@ class HTMLPurifier_AttrDef_HTML_LinkTypes extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/HTML/MultiLength.php

@@ -41,4 +41,3 @@ class HTMLPurifier_AttrDef_HTML_MultiLength extends HTMLPurifier_AttrDef_HTML_Le
     
 }
 
-?>

library/HTMLPurifier/AttrDef/HTML/Nmtokens.php

@@ -48,4 +48,3 @@ class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/HTML/Pixels.php

@@ -34,4 +34,3 @@ class HTMLPurifier_AttrDef_HTML_Pixels extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/Integer.php

@@ -72,4 +72,3 @@ class HTMLPurifier_AttrDef_Integer extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/Lang.php

@@ -72,4 +72,3 @@ class HTMLPurifier_AttrDef_Lang extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/Text.php

@@ -14,4 +14,3 @@ class HTMLPurifier_AttrDef_Text extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/URI.php

@@ -1,90 +1,65 @@
 <?php
 
 require_once 'HTMLPurifier/AttrDef.php';
+require_once 'HTMLPurifier/URIParser.php';
 require_once 'HTMLPurifier/URIScheme.php';
 require_once 'HTMLPurifier/URISchemeRegistry.php';
 require_once 'HTMLPurifier/AttrDef/URI/Host.php';
 require_once 'HTMLPurifier/PercentEncoder.php';
 
-HTMLPurifier_ConfigSchema::define(
-    'URI', 'DefaultScheme', 'http', 'string',
-    'Defines through what scheme the output will be served, in order to '.
-    'select the proper object validator when no scheme information is present.'
-);
+// special case filtering directives 
 
 HTMLPurifier_ConfigSchema::define(
-    'URI', 'Host', null, 'string/null',
-    'Defines the domain name of the server, so we can determine whether or '.
-    'an absolute URI is from your website or not.  Not strictly necessary, '.
-    'as users should be using relative URIs to reference resources on your '.
-    'website.  It will, however, let you use absolute URIs to link to '.
-    'subdomains of the domain you post here: i.e. example.com will allow '.
-    'sub.example.com.  However, higher up domains will still be excluded: '.
-    'if you set %URI.Host to sub.example.com, example.com will be blocked. '.
-    'This directive has been available since 1.2.0.'
-);
+    'URI', 'Munge', null, 'string/null', '
+<p>
+    Munges all browsable (usually http, https and ftp)
+    absolute URI\'s into another URI, usually a URI redirection service.
+    This directive accepts a URI, formatted with a <code>%s</code> where 
+    the url-encoded original URI should be inserted (sample: 
+    <code>http://www.google.com/url?q=%s</code>).
+</p>
+<p>
+    Uses for this directive:
+</p>
+<ul>
+    <li>
+        Prevent PageRank leaks, while being fairly transparent 
+        to users (you may also want to add some client side JavaScript to 
+        override the text in the statusbar). <strong>Notice</strong>:
+        Many security experts believe that this form of protection does not deter spam-bots. 
+    </li>
+    <li>
+        Redirect users to a splash page telling them they are leaving your
+        website. While this is poor usability practice, it is often mandated
+        in corporate environments.
+    </li>
+</ul>
+<p>
+    This directive has been available since 1.3.0.
+</p>
+');
+
+// disabling directives
 
 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'.
-    'links or images outside of your domain will be allowed.  Non-linkified '.
-    'URIs will still be preserved.  If you want to be able to link to '.
-    'subdomains or use absolute URIs, specify %URI.Host for your website. '.
-    '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.'
-);
+    'URI', 'Disable', false, 'bool', '
+<p>
+    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.
+</p>
+');
 HTMLPurifier_ConfigSchema::defineAlias('Attr', 'DisableURI', 'URI', 'Disable');
 
+HTMLPurifier_ConfigSchema::define(
+    'URI', 'DisableResources', false, 'bool', '
+<p>
+    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.
+</p>
+');
+
 /**
  * Validates a URI as defined by RFC 3986.
  * @note Scheme-specific mechanics deferred to HTMLPurifier_URIScheme
@@ -92,214 +67,83 @@ HTMLPurifier_ConfigSchema::defineAlias('Attr', 'DisableURI', 'URI', 'Disable');
 class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
 {
     
-    var $host;
-    var $embeds_resource;
+    var $parser, $percentEncoder;
+    var $embedsResource;
     
     /**
      * @param $embeds_resource_resource Does the URI here result in an extra HTTP request?
      */
     function HTMLPurifier_AttrDef_URI($embeds_resource = false) {
-        $this->host = new HTMLPurifier_AttrDef_URI_Host();
-        $this->embeds_resource = (bool) $embeds_resource;
+        $this->parser = new HTMLPurifier_URIParser();
+        $this->percentEncoder = new HTMLPurifier_PercentEncoder();
+        $this->embedsResource = (bool) $embeds_resource;
     }
     
     function validate($uri, $config, &$context) {
         
-        static $PercentEncoder = null;
-        if ($PercentEncoder === null) $PercentEncoder = new HTMLPurifier_PercentEncoder();
-        
-        // We'll write stack-based parsers later, for now, use regexps to
-        // get things working as fast as possible (irony)
-        
         if ($config->get('URI', 'Disable')) return false;
         
-        // parse as CDATA
+        // initial operations
         $uri = $this->parseCDATA($uri);
+        $uri = $this->percentEncoder->normalize($uri);
         
-        // fix up percent-encoding
-        $uri = $PercentEncoder->normalize($uri);
+        // parse the URI
+        $uri = $this->parser->parse($uri);
+        if ($uri === false) return false;
         
-        // while it would be nice to use parse_url(), that's specifically
-        // for HTTP and thus won't work for our generic URI parsing
+        // add embedded flag to context for validators
+        $context->register('EmbeddedURI', $this->embedsResource); 
         
-        // according to the RFC... (but this cuts corners, i.e. non-validating)
-        $r_URI = '!'.
-            '(([^:/?#<>\'"]+):)?'. // 2. Scheme
-            '(//([^/?#<>\'"]*))?'. // 4. Authority
-            '([^?#<>\'"]*)'.       // 5. Path
-            '(\?([^#<>\'"]*))?'.   // 7. Query
-            '(#([^<>\'"]*))?'.     // 8. Fragment
-            '!';
+        $ok = false;
+        do {
             
-        $matches = array();
-        $result = preg_match($r_URI, $uri, $matches);
+            // generic validation
+            $result = $uri->validate($config, $context);
+            if (!$result) break;
             
-        if (!$result) return false; // invalid URI
+            // chained validation
+            $uri_def =& $config->getDefinition('URI');
+            $result = $uri_def->filter($uri, $config, $context);
+            if (!$result) break;
             
-        // seperate out parts
-        $scheme     = !empty($matches[1]) ? $matches[2] : null;
-        $authority  = !empty($matches[3]) ? $matches[4] : null;
-        $path       = $matches[5]; // always present, can be empty
-        $query      = !empty($matches[6]) ? $matches[7] : null;
-        $fragment   = !empty($matches[8]) ? $matches[9] : null;
+            // scheme-specific validation 
+            $scheme_obj = $uri->getSchemeObj($config, $context);
+            if (!$scheme_obj) break;
+            if ($this->embedsResource && !$scheme_obj->browsable) break;
+            $result = $scheme_obj->validate($uri, $config, $context);
+            if (!$result) break;
             
+            // survived gauntlet
+            $ok = true;
             
+        } while (false);
         
-        $registry =& HTMLPurifier_URISchemeRegistry::instance();
-        if ($scheme !== null) {
-            // 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, $context);
-            if (!$scheme_obj) return false; // invalid scheme, clean it out
-        } else {
-            $scheme_obj = $registry->getScheme(
-                $config->get('URI', 'DefaultScheme'), $config, $context
-            );
+        $context->destroy('EmbeddedURI');
+        if (!$ok) return false;
+        
+        // munge scheme off if necessary (this must be last)
+        if (!is_null($uri->scheme) && is_null($uri->host)) {
+            if ($uri_def->defaultScheme == $uri->scheme) {
+                $uri->scheme = null;
+            }
         }
         
-        // something funky weird happened in the registry, abort!
-        if (!$scheme_obj) {
-            trigger_error(
-                'Default scheme object "' . $config->get('URI', 'DefaultScheme') . '" was not readable',
-                E_USER_WARNING
-            );
-            return false;
-        }
+        // back to string
+        $result = $uri->toString();
         
-        // the URI we're processing embeds_resource a resource in the page, but the URI
-        // it references cannot be located
-        if ($this->embeds_resource && !$scheme_obj->browsable) {
-            return false;
-        }
-        
-        
-        if ($authority !== null) {
-            
-            // remove URI if it's absolute and we disabled externals or
-            // if it's absolute and embedded and we disabled external resources
-            unset($our_host);
+        // munge entire URI if necessary
         if (
-                $config->get('URI', 'DisableExternal') ||
-                (
-                    $config->get('URI', 'DisableExternalResources') &&
-                    $this->embeds_resource
-                )
+            !is_null($uri->host) && // indicator for authority
+            !empty($scheme_obj->browsable) &&
+            !is_null($munge = $config->get('URI', 'Munge'))
         ) {
-                $our_host = $config->get('URI', 'Host');
-                if ($our_host === null) return false;
-            }
-            
-            $HEXDIG = '[A-Fa-f0-9]';
-            $unreserved = 'A-Za-z0-9-._~'; // make sure you wrap with []
-            $sub_delims = '!$&\'()'; // needs []
-            $pct_encoded = "%$HEXDIG$HEXDIG";
-            $r_userinfo = "(?:[$unreserved$sub_delims:]|$pct_encoded)*";
-            $r_authority = "/^(($r_userinfo)@)?(\[[^\]]+\]|[^:]*)(:(\d*))?/";
-            $matches = array();
-            preg_match($r_authority, $authority, $matches);
-            // overloads regexp!
-            $userinfo   = !empty($matches[1]) ? $matches[2] : null;
-            $host       = !empty($matches[3]) ? $matches[3] : null;
-            $port       = !empty($matches[4]) ? $matches[5] : null;
-            
-            // validate port
-            if ($port !== null) {
-                $port = (int) $port;
-                if ($port < 1 || $port > 65535) $port = null;
-            }
-            
-            $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));
-                // could be cached
-                $our_host_parts = array_reverse(explode('.', $our_host));
-                foreach ($our_host_parts as $i => $discard) {
-                    if (!isset($host_parts[$i])) return false;
-                    if ($host_parts[$i] != $our_host_parts[$i]) return false;
-                }
-            }
-            
-            // userinfo and host are validated within the regexp
-            
-        } else {
-            $port = $host = $userinfo = null;
-        }
-        
-        
-        // query and fragment are quite simple in terms of definition:
-        // *( pchar / "/" / "?" ), so define their validation routines
-        // when we start fixing percent encoding
-        
-        
-        
-        // path gets to be validated against a hodge-podge of rules depending
-        // on the status of authority and scheme, but it's not that important,
-        // esp. since it won't be applicable to everyone
-        
-        
-        
-        // okay, now we defer execution to the subobject for more processing
-        // note that $fragment is omitted
-        list($userinfo, $host, $port, $path, $query) = 
-            $scheme_obj->validateComponents(
-                $userinfo, $host, $port, $path, $query, $config, $context
-            );
-        
-        
-        // reconstruct authority
-        $authority = null;
-        if (!is_null($userinfo) || !is_null($host) || !is_null($port)) {
-            $authority = '';
-            if($userinfo !== null) $authority .= $userinfo . '@';
-            $authority .= $host;
-            if($port !== null) $authority .= ':' . $port;
-        }
-        
-        // reconstruct the result
-        $result = '';
-        if ($scheme !== null) $result .= "$scheme:";
-        if ($authority !== null) $result .= "//$authority";
-        $result .= $path;
-        if ($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

@@ -14,4 +14,3 @@ class HTMLPurifier_AttrDef_URI_Email extends HTMLPurifier_AttrDef
     
 }
 
-?>

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

@@ -20,4 +20,3 @@ class HTMLPurifier_AttrDef_URI_Email_SimpleCheck extends HTMLPurifier_AttrDef_UR
     
 }
 
-?>

library/HTMLPurifier/AttrDef/URI/Host.php

@@ -51,4 +51,3 @@ class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/URI/IPv4.php

@@ -39,4 +39,3 @@ class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef
     
 }
 
-?>

library/HTMLPurifier/AttrDef/URI/IPv6.php

@@ -98,4 +98,3 @@ class HTMLPurifier_AttrDef_URI_IPv6 extends HTMLPurifier_AttrDef_URI_IPv4
     
 }
 
-?>

library/HTMLPurifier/AttrTransform.php

@@ -55,4 +55,3 @@ class HTMLPurifier_AttrTransform
     
 }
 
-?>

library/HTMLPurifier/AttrTransform/BdoDir.php

@@ -28,4 +28,3 @@ class HTMLPurifier_AttrTransform_BdoDir extends HTMLPurifier_AttrTransform
     
 }
 
-?>

library/HTMLPurifier/AttrTransform/BgColor.php

@@ -23,4 +23,3 @@ extends HTMLPurifier_AttrTransform {
     
 }
 
-?>

library/HTMLPurifier/AttrTransform/BoolToCSS.php

@@ -36,4 +36,3 @@ extends HTMLPurifier_AttrTransform {
     
 }
 
-?>

library/HTMLPurifier/AttrTransform/Border.php

@@ -17,4 +17,3 @@ class HTMLPurifier_AttrTransform_Border extends HTMLPurifier_AttrTransform {
     
 }
 
-?>

library/HTMLPurifier/AttrTransform/EnumToCSS.php

@@ -57,4 +57,3 @@ class HTMLPurifier_AttrTransform_EnumToCSS extends HTMLPurifier_AttrTransform {
     
 }
 
-?>

library/HTMLPurifier/AttrTransform/ImgRequired.php

@@ -51,4 +51,3 @@ class HTMLPurifier_AttrTransform_ImgRequired extends HTMLPurifier_AttrTransform
     
 }
 
-?>

library/HTMLPurifier/AttrTransform/ImgSpace.php

@@ -44,4 +44,3 @@ extends HTMLPurifier_AttrTransform {
     
 }
 
-?>

library/HTMLPurifier/AttrTransform/Lang.php

@@ -27,4 +27,3 @@ class HTMLPurifier_AttrTransform_Lang extends HTMLPurifier_AttrTransform
     
 }
 
-?>

library/HTMLPurifier/AttrTransform/Length.php

@@ -26,4 +26,3 @@ class HTMLPurifier_AttrTransform_Length extends HTMLPurifier_AttrTransform
     
 }
 
-?>

library/HTMLPurifier/AttrTransform/Name.php

@@ -18,4 +18,3 @@ class HTMLPurifier_AttrTransform_Name extends HTMLPurifier_AttrTransform
     
 }
 
-?>

library/HTMLPurifier/AttrTypes.php

@@ -79,4 +79,4 @@ class HTMLPurifier_AttrTypes
     }
 }
 
-?>
+

library/HTMLPurifier/AttrValidator.php

@@ -1,32 +1,53 @@
 <?php
 
+/**
+ * Validates the attributes of a token. Doesn't manage required attributes
+ * very well. The only reason we factored this out was because RemoveForeignElements
+ * also needed it besides ValidateAttributes.
+ */
 class HTMLPurifier_AttrValidator
 {
     
-    
-    function validateToken($token, &$config, &$context) {
+    /**
+     * Validates the attributes of a token, returning a modified token
+     * that has valid tokens
+     * @param $token Reference to token to validate. We require a reference
+     *     because the operation this class performs on the token are
+     *     not atomic, so the context CurrentToken to be updated
+     *     throughout
+     * @param $config Instance of HTMLPurifier_Config
+     * @param $context Instance of HTMLPurifier_Context
+     */
+    function validateToken(&$token, &$config, &$context) {
             
         $definition = $config->getHTMLDefinition();
+        $e =& $context->get('ErrorCollector', true);
+        
+        // initialize CurrentToken if necessary
+        $current_token =& $context->get('CurrentToken', true);
+        if (!$current_token) $context->register('CurrentToken', $token);
+        
+        if ($token->type !== 'start' && $token->type !== 'empty') return $token;
         
         // create alias to global definition array, see also $defs
         // DEFINITION CALL
         $d_defs = $definition->info_global_attr;
         
-        // copy out attributes for easy manipulation
-        $attr = $token->attr;
+        // reference attributes for easy manipulation
+        $attr =& $token->attr;
         
         // do global transformations (pre)
         // nothing currently utilizes this
         foreach ($definition->info_attr_transform_pre as $transform) {
-            $attr = $transform->transform($attr, $config, $context);
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e && ($attr != $o)) $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
         }
         
         // do local transformations only applicable to this element (pre)
         // ex. <p align="right"> to <p style="text-align:right;">
-        foreach ($definition->info[$token->name]->attr_transform_pre
-            as $transform
-        ) {
-            $attr = $transform->transform($attr, $config, $context);
+        foreach ($definition->info[$token->name]->attr_transform_pre as $transform) {
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e && ($attr != $o)) $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
         }
         
         // create alias to this element's attribute definition array, see
@@ -34,6 +55,9 @@ class HTMLPurifier_AttrValidator
         // DEFINITION CALL
         $defs = $definition->info[$token->name]->attr;
         
+        $attr_key = false;
+        $context->register('CurrentAttr', $attr_key);
+        
         // iterate through all the attribute keypairs
         // Watch out for name collisions: $key has previously been used
         foreach ($attr as $attr_key => $value) {
@@ -67,9 +91,17 @@ class HTMLPurifier_AttrValidator
             
             // put the results into effect
             if ($result === false || $result === null) {
+                // this is a generic error message that should replaced
+                // with more specific ones when possible
+                if ($e) $e->send(E_ERROR, 'AttrValidator: Attribute removed');
+                
                 // remove the attribute
                 unset($attr[$attr_key]);
             } elseif (is_string($result)) {
+                // generally, if a substitution is happening, there
+                // was some sort of implicit correction going on. We'll
+                // delegate it to the attribute classes to say exactly what.
+                
                 // simple substitution
                 $attr[$attr_key] = $result;
             }
@@ -81,25 +113,27 @@ class HTMLPurifier_AttrValidator
             // others would prepend themselves).
         }
         
+        $context->destroy('CurrentAttr');
+        
         // post transforms
         
-        // ex. <x lang="fr"> to <x lang="fr" xml:lang="fr">
+        // global (error reporting untested)
         foreach ($definition->info_attr_transform_post as $transform) {
-            $attr = $transform->transform($attr, $config, $context);
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e && ($attr != $o)) $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
         }
         
-        // ex. <bdo> to <bdo dir="ltr">
+        // local (error reporting untested)
         foreach ($definition->info[$token->name]->attr_transform_post as $transform) {
-            $attr = $transform->transform($attr, $config, $context);
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e && ($attr != $o)) $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
         }
         
-        // commit changes
-        $token->attr = $attr;
-        return $token;
+        // destroy CurrentToken if we made it ourselves
+        if (!$current_token) $context->destroy('CurrentToken');
         
     }
     
     
 }
 
-?>

library/HTMLPurifier/CSSDefinition.php

@@ -226,4 +226,3 @@ class HTMLPurifier_CSSDefinition extends HTMLPurifier_Definition
     
 }
 
-?>

library/HTMLPurifier/ChildDef.php

@@ -36,6 +36,11 @@ class HTMLPurifier_ChildDef
      */
     var $allow_empty;
     
+    /**
+     * Lookup array of all elements that this definition could possibly allow
+     */
+    var $elements = array();
+    
     /**
      * Validates nodes according to definition and returns modification.
      * 
@@ -52,4 +57,4 @@ class HTMLPurifier_ChildDef
     }
 }
 
-?>
+

library/HTMLPurifier/ChildDef/Chameleon.php

@@ -35,6 +35,7 @@ class HTMLPurifier_ChildDef_Chameleon extends HTMLPurifier_ChildDef
     function HTMLPurifier_ChildDef_Chameleon($inline, $block) {
         $this->inline = new HTMLPurifier_ChildDef_Optional($inline);
         $this->block  = new HTMLPurifier_ChildDef_Optional($block);
+        $this->elements = $this->block->elements;
     }
     
     function validateChildren($tokens_of_children, $config, &$context) {
@@ -48,4 +49,3 @@ class HTMLPurifier_ChildDef_Chameleon extends HTMLPurifier_ChildDef
     }
 }
 
-?>

library/HTMLPurifier/ChildDef/Custom.php

@@ -44,6 +44,12 @@ class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
         // COMPLICATED! AND MIGHT BE BUGGY! I HAVE NO CLUE WHAT I'M
         // DOING! Seriously: if there's problems, please report them.
         
+        // collect all elements into the $elements array
+        preg_match_all("/$el/", $reg, $matches);
+        foreach ($matches[0] as $match) {
+            $this->elements[$match] = true;
+        }
+        
         // setup all elements as parentheticals with leading commas
         $reg = preg_replace("/$el/", '(,\\0)', $reg);
         
@@ -85,4 +91,3 @@ class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
     }
 }
 
-?>

library/HTMLPurifier/ChildDef/Empty.php

@@ -19,4 +19,3 @@ class HTMLPurifier_ChildDef_Empty extends HTMLPurifier_ChildDef
     }
 }
 
-?>

library/HTMLPurifier/ChildDef/Optional.php

@@ -20,4 +20,3 @@ class HTMLPurifier_ChildDef_Optional extends HTMLPurifier_ChildDef_Required
     }
 }
 
-?>

library/HTMLPurifier/ChildDef/Required.php

@@ -25,7 +25,7 @@ class HTMLPurifier_ChildDef_Required extends HTMLPurifier_ChildDef
             $elements = array_flip($elements);
             foreach ($elements as $i => $x) {
                 $elements[$i] = true;
-                if (empty($i)) unset($elements[$i]);
+                if (empty($i)) unset($elements[$i]); // remove blank
             }
         }
         $this->elements = $elements;
@@ -109,4 +109,3 @@ class HTMLPurifier_ChildDef_Required extends HTMLPurifier_ChildDef
     }
 }
 
-?>

library/HTMLPurifier/ChildDef/StrictBlockquote.php

@@ -73,4 +73,3 @@ extends HTMLPurifier_ChildDef_Required
     }
 }
 
-?>

library/HTMLPurifier/ChildDef/Table.php

@@ -9,6 +9,8 @@ class HTMLPurifier_ChildDef_Table extends HTMLPurifier_ChildDef
 {
     var $allow_empty = false;
     var $type = 'table';
+    var $elements = array('tr' => true, 'tbody' => true, 'thead' => true,
+        'tfoot' => true, 'caption' => true, 'colgroup' => true, 'col' => true);
     function HTMLPurifier_ChildDef_Table() {}
     function validateChildren($tokens_of_children, $config, &$context) {
         if (empty($tokens_of_children)) return false;
@@ -139,4 +141,3 @@ class HTMLPurifier_ChildDef_Table extends HTMLPurifier_ChildDef
     }
 }
 
-?>

library/HTMLPurifier/Config.php

@@ -5,6 +5,7 @@ require_once 'HTMLPurifier/ConfigSchema.php';
 // member variables
 require_once 'HTMLPurifier/HTMLDefinition.php';
 require_once 'HTMLPurifier/CSSDefinition.php';
+require_once 'HTMLPurifier/URIDefinition.php';
 require_once 'HTMLPurifier/Doctype.php';
 require_once 'HTMLPurifier/DefinitionCacheFactory.php';
 
@@ -41,7 +42,7 @@ class HTMLPurifier_Config
     /**
      * HTML Purifier's version
      */
-    var $version = '2.0.0';
+    var $version = '2.1.1';
     
     /**
      * Two-level associative array of configuration directives
@@ -75,6 +76,11 @@ class HTMLPurifier_Config
      */
     var $serials = array();
     
+    /**
+     * Serial for entire configuration object
+     */
+    var $serial;
+    
     /**
      * @param $definition HTMLPurifier_ConfigSchema that defines what directives
      *                    are allowed.
@@ -93,15 +99,11 @@ class HTMLPurifier_Config
      *                      or a string filename of an ini file.
      * @return Configured HTMLPurifier_Config object
      */
-    function create($config) {
-        if (is_a($config, 'HTMLPurifier_Config')) {
-            // pass-through
-            return $config;
-        }
+    static function create($config) {
+        if ($config instanceof HTMLPurifier_Config) return $config;
         $ret = HTMLPurifier_Config::createDefault();
         if (is_string($config)) $ret->loadIni($config);
         elseif (is_array($config)) $ret->loadArray($config);
-        if (isset($revision)) $ret->revision = $revision;
         return $ret;
     }
     
@@ -110,7 +112,7 @@ class HTMLPurifier_Config
      * @static
      * @return Default HTMLPurifier_Config object.
      */
-    function createDefault() {
+    static function createDefault() {
         $definition =& HTMLPurifier_ConfigSchema::instance();
         $config = new HTMLPurifier_Config($definition);
         return $config;
@@ -155,15 +157,30 @@ class HTMLPurifier_Config
     /**
      * Returns a md5 signature of a segment of the configuration object
      * that uniquely identifies that particular configuration
+     * @note Revision is handled specially and is removed from the batch
+     *       before processing!
      * @param $namespace Namespace to get serial for
      */
     function getBatchSerial($namespace) {
         if (empty($this->serials[$namespace])) {
-            $this->serials[$namespace] = md5(serialize($this->getBatch($namespace)));
+            $batch = $this->getBatch($namespace);
+            unset($batch['DefinitionRev']);
+            $this->serials[$namespace] = md5(serialize($batch));
         }
         return $this->serials[$namespace];
     }
     
+    /**
+     * Returns a md5 signature for the entire configuration object
+     * that uniquely identifies that particular configuration
+     */
+    function getSerial() {
+        if (empty($this->serial)) {
+            $this->serial = md5(serialize($this->getAll()));
+        }
+        return $this->serial;
+    }
+    
     /**
      * Retrieves all directives, organized by namespace
      */
@@ -246,14 +263,16 @@ class HTMLPurifier_Config
      *             called before it's been setup, otherwise won't work.
      */
     function &getHTMLDefinition($raw = false) {
-        return $this->getDefinition('HTML', $raw);
+        $def =& $this->getDefinition('HTML', $raw);
+        return $def; // prevent PHP 4.4.0 from complaining
     }
     
     /**
      * Retrieves reference to the CSS definition
      */
     function &getCSSDefinition($raw = false) {
-        return $this->getDefinition('CSS', $raw);
+        $def =& $this->getDefinition('CSS', $raw);
+        return $def;
     }
     
     /**
@@ -270,6 +289,7 @@ class HTMLPurifier_Config
             if (!empty($this->definitions[$type])) {
                 if (!$this->definitions[$type]->setup) {
                     $this->definitions[$type]->setup($this);
+                    $cache->set($this->definitions[$type], $this);
                 }
                 return $this->definitions[$type];
             }
@@ -291,6 +311,8 @@ class HTMLPurifier_Config
             $this->definitions[$type] = new HTMLPurifier_HTMLDefinition();
         } elseif ($type == 'CSS') {
             $this->definitions[$type] = new HTMLPurifier_CSSDefinition();
+        } elseif ($type == 'URI') {
+            $this->definitions[$type] = new HTMLPurifier_URIDefinition();
         } else {
             trigger_error("Definition of $type type not supported");
             $false = false;
@@ -301,7 +323,7 @@ class HTMLPurifier_Config
             if (is_null($this->get($type, 'DefinitionID'))) {
                 // fatally error out if definition ID not set
                 trigger_error("Cannot retrieve raw version without specifying %$type.DefinitionID", E_USER_ERROR);
-                $false = false;
+                $false = new HTMLPurifier_Error();
                 return $false;
             }
             return $this->definitions[$type];
@@ -336,25 +358,96 @@ class HTMLPurifier_Config
         }
     }
     
+    /**
+     * Returns a list of array(namespace, directive) for all directives
+     * that are allowed in a web-form context as per an allowed
+     * namespaces/directives list.
+     * @param $allowed List of allowed namespaces/directives
+     * @static
+     */
+    static function getAllowedDirectivesForForm($allowed) {
+        $schema = HTMLPurifier_ConfigSchema::instance();
+        if ($allowed !== true) {
+             if (is_string($allowed)) $allowed = array($allowed);
+             $allowed_ns = array();
+             $allowed_directives = array();
+             $blacklisted_directives = array();
+             foreach ($allowed as $ns_or_directive) {
+                 if (strpos($ns_or_directive, '.') !== false) {
+                     // directive
+                     if ($ns_or_directive[0] == '-') {
+                         $blacklisted_directives[substr($ns_or_directive, 1)] = true;
+                     } else {
+                         $allowed_directives[$ns_or_directive] = true;
+                     }
+                 } else {
+                     // namespace
+                     $allowed_ns[$ns_or_directive] = true;
+                 }
+             }
+        }
+        $ret = array();
+        foreach ($schema->info as $ns => $keypairs) {
+            foreach ($keypairs as $directive => $def) {
+                if ($allowed !== true) {
+                    if (isset($blacklisted_directives["$ns.$directive"])) continue;
+                    if (!isset($allowed_directives["$ns.$directive"]) && !isset($allowed_ns[$ns])) continue;
+                }
+                if ($def->class == 'alias') continue;
+                if ($directive == 'DefinitionID' || $directive == 'DefinitionRev') continue;
+                $ret[] = array($ns, $directive);
+            }
+        }
+        return $ret;
+    }
+    
     /**
      * Loads configuration values from $_GET/$_POST that were posted
      * via ConfigForm
      * @param $array $_GET or $_POST array to import
      * @param $index Index/name that the config variables are in
+     * @param $allowed List of allowed namespaces/directives 
      * @param $mq_fix Boolean whether or not to enable magic quotes fix
      * @static
      */
-    function loadArrayFromForm($array, $index, $mq_fix = true) {
+    static function loadArrayFromForm($array, $index, $allowed = true, $mq_fix = true) {
+        $ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix);
+        $config = HTMLPurifier_Config::create($ret);
+        return $config;
+    }
+    
+    /**
+     * Merges in configuration values from $_GET/$_POST to object. NOT STATIC.
+     * @note Same parameters as loadArrayFromForm
+     */
+    function mergeArrayFromForm($array, $index, $allowed = true, $mq_fix = true) {
+         $ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix);
+         $this->loadArray($ret);
+    }
+    
+    /**
+     * Prepares an array from a form into something usable for the more
+     * strict parts of HTMLPurifier_Config
+     * @static
+     */
+    static function prepareArrayFromForm($array, $index, $allowed = true, $mq_fix = true) {
         $array = (isset($array[$index]) && is_array($array[$index])) ? $array[$index] : array();
         $mq = get_magic_quotes_gpc() && $mq_fix;
-        foreach ($array as $key => $value) {
-            if (!strncmp($key, 'Null_', 5) && !empty($value)) {
-                unset($array[substr($key, 5)]);
-                unset($array[$key]);
+        
+        $allowed = HTMLPurifier_Config::getAllowedDirectivesForForm($allowed);
+        $ret = array();
+        foreach ($allowed as $key) {
+            list($ns, $directive) = $key;
+            $skey = "$ns.$directive";
+            if (!empty($array["Null_$skey"])) {
+                $ret[$ns][$directive] = null;
+                continue;
             }
-            if ($mq) $array[$key] = stripslashes($value);
+            if (!isset($array[$skey])) continue;
+            $value = $mq ? stripslashes($array[$skey]) : $array[$skey];
+            $ret[$ns][$directive] = $value;
         }
-        return @HTMLPurifier_Config::create($array);
+        return $ret;
     }
     
     /**
@@ -395,4 +488,4 @@ class HTMLPurifier_Config
     
 }
 
-?>
+

library/HTMLPurifier/ConfigDef.php

@@ -7,4 +7,3 @@ class HTMLPurifier_ConfigDef {
     var $class = false;
 }
 
-?>

library/HTMLPurifier/ConfigDef/Directive.php

@@ -61,6 +61,12 @@ class HTMLPurifier_ConfigDef_Directive extends HTMLPurifier_ConfigDef
      */
     var $aliases = array();
     
+    /**
+     * Advisory list of directive aliases, i.e. other directives that
+     * redirect here
+     */
+    var $directiveAliases = array();
+    
     /**
      * Adds a description to the array
      */
@@ -71,4 +77,3 @@ class HTMLPurifier_ConfigDef_Directive extends HTMLPurifier_ConfigDef
     
 }
 
-?>

library/HTMLPurifier/ConfigDef/DirectiveAlias.php

@@ -24,4 +24,3 @@ class HTMLPurifier_ConfigDef_DirectiveAlias extends HTMLPurifier_ConfigDef
     }
 }
 
-?>

library/HTMLPurifier/ConfigDef/Namespace.php

@@ -20,4 +20,3 @@ class HTMLPurifier_ConfigDef_Namespace extends HTMLPurifier_ConfigDef {
     
 }
 
-?>

library/HTMLPurifier/ConfigSchema.php

@@ -6,6 +6,8 @@ require_once 'HTMLPurifier/ConfigDef/Namespace.php';
 require_once 'HTMLPurifier/ConfigDef/Directive.php';
 require_once 'HTMLPurifier/ConfigDef/DirectiveAlias.php';
 
+if (!defined('HTMLPURIFIER_SCHEMA_STRICT')) define('HTMLPURIFIER_SCHEMA_STRICT', false);
+
 /**
  * Configuration definition, defines directives and their defaults.
  * @note If you update this, please update Printer_ConfigForm
@@ -49,6 +51,8 @@ class HTMLPurifier_ConfigSchema {
     var $types = array(
         'string'    => 'String',
         'istring'   => 'Case-insensitive string',
+        'text'      => 'Text',
+        'itext'      => 'Case-insensitive text',
         'int'       => 'Integer',
         'float'     => 'Float',
         'bool'      => 'Boolean',
@@ -67,6 +71,8 @@ class HTMLPurifier_ConfigSchema {
         $this->defineNamespace('URI', 'Features regarding Uniform Resource Identifiers.');
         $this->defineNamespace('HTML', 'Configuration regarding allowed HTML.');
         $this->defineNamespace('CSS', 'Configuration regarding allowed CSS.');
+        $this->defineNamespace('AutoFormat', 'Configuration for activating auto-formatting functionality (also known as <code>Injector</code>s)');
+        $this->defineNamespace('AutoFormatParam', 'Configuration for customizing auto-formatting functionality');
         $this->defineNamespace('Output', 'Configuration relating to the generation of (X)HTML.');
         $this->defineNamespace('Cache', 'Configuration for DefinitionCache and related subclasses.');
         $this->defineNamespace('Test', 'Developer testing configuration for our unit tests.');
@@ -76,7 +82,7 @@ class HTMLPurifier_ConfigSchema {
      * Retrieves an instance of the application-wide configuration definition.
      * @static
      */
-    function &instance($prototype = null) {
+    static function &instance($prototype = null) {
         static $instance;
         if ($prototype !== null) {
             $instance = $prototype;
@@ -98,11 +104,11 @@ class HTMLPurifier_ConfigSchema {
      *      HTMLPurifier_DirectiveDef::$type for allowed values
      * @param $description Description of directive for documentation
      */
-    function define(
-        $namespace, $name, $default, $type, 
-        $description
-    ) {
+    static function define($namespace, $name, $default, $type, $description) {
         $def =& HTMLPurifier_ConfigSchema::instance();
+        
+        // basic sanity checks
+        if (HTMLPURIFIER_SCHEMA_STRICT) {
             if (!isset($def->info[$namespace])) {
                 trigger_error('Cannot define directive for undefined namespace',
                     E_USER_ERROR);
@@ -118,7 +124,10 @@ class HTMLPurifier_ConfigSchema {
                     E_USER_ERROR);
                 return;
             }
+        }
+        
         if (isset($def->info[$namespace][$name])) {
+            // already defined
             if (
                 $def->info[$namespace][$name]->type !== $type ||
                 $def->defaults[$namespace][$name]   !== $default
@@ -127,12 +136,15 @@ class HTMLPurifier_ConfigSchema {
                 return;
             }
         } else {
-            // process modifiers
+            // needs defining
+            
+            // process modifiers (OPTIMIZE!)
             $type_values = explode('/', $type, 2);
             $type = $type_values[0];
             $modifier = isset($type_values[1]) ? $type_values[1] : false;
             $allow_null = ($modifier === 'null');
             
+            if (HTMLPURIFIER_SCHEMA_STRICT) {
                 if (!isset($def->types[$type])) {
                     trigger_error('Invalid type for configuration directive',
                         E_USER_ERROR);
@@ -144,12 +156,15 @@ class HTMLPurifier_ConfigSchema {
                         E_USER_ERROR);
                     return;
                 }
+            }
+            
             $def->info[$namespace][$name] =
                 new HTMLPurifier_ConfigDef_Directive();
             $def->info[$namespace][$name]->type = $type;
             $def->info[$namespace][$name]->allow_null = $allow_null;
             $def->defaults[$namespace][$name]   = $default;
         }
+        if (!HTMLPURIFIER_SCHEMA_STRICT) return;
         $backtrace = debug_backtrace();
         $file = $def->mungeFilename($backtrace[0]['file']);
         $line = $backtrace[0]['line'];
@@ -162,8 +177,9 @@ class HTMLPurifier_ConfigSchema {
      * @param $namespace Namespace's name
      * @param $description Description of the namespace
      */
-    function defineNamespace($namespace, $description) {
+    static function defineNamespace($namespace, $description) {
         $def =& HTMLPurifier_ConfigSchema::instance();
+        if (HTMLPURIFIER_SCHEMA_STRICT) {
             if (isset($def->info[$namespace])) {
                 trigger_error('Cannot redefine namespace', E_USER_ERROR);
                 return;
@@ -178,6 +194,7 @@ class HTMLPurifier_ConfigSchema {
                     E_USER_ERROR);
                 return;
             }
+        }
         $def->info[$namespace] = array();
         $def->info_namespace[$namespace] = new HTMLPurifier_ConfigDef_Namespace();
         $def->info_namespace[$namespace]->description = $description;
@@ -195,14 +212,15 @@ class HTMLPurifier_ConfigSchema {
      * @param $alias Name of aliased value
      * @param $real Value aliased value will be converted into
      */
-    function defineValueAliases($namespace, $name, $aliases) {
+    static function defineValueAliases($namespace, $name, $aliases) {
         $def =& HTMLPurifier_ConfigSchema::instance();
-        if (!isset($def->info[$namespace][$name])) {
+        if (HTMLPURIFIER_SCHEMA_STRICT && !isset($def->info[$namespace][$name])) {
             trigger_error('Cannot set value alias for non-existant directive',
                 E_USER_ERROR);
             return;
         }
         foreach ($aliases as $alias => $real) {
+            if (HTMLPURIFIER_SCHEMA_STRICT) {
                 if (!$def->info[$namespace][$name] !== true &&
                     !isset($def->info[$namespace][$name]->allowed[$real])
                 ) {
@@ -215,6 +233,7 @@ class HTMLPurifier_ConfigSchema {
                         E_USER_ERROR);
                     return;
                 }
+            }
             $def->info[$namespace][$name]->aliases[$alias] = $real;
         }
     }
@@ -226,16 +245,16 @@ class HTMLPurifier_ConfigSchema {
      * @param $name Name of directive
      * @param $allowed_values Arraylist of allowed values
      */
-    function defineAllowedValues($namespace, $name, $allowed_values) {
+    static function defineAllowedValues($namespace, $name, $allowed_values) {
         $def =& HTMLPurifier_ConfigSchema::instance();
-        if (!isset($def->info[$namespace][$name])) {
+        if (HTMLPURIFIER_SCHEMA_STRICT && !isset($def->info[$namespace][$name])) {
             trigger_error('Cannot define allowed values for undefined directive',
                 E_USER_ERROR);
             return;
         }
         $directive =& $def->info[$namespace][$name];
         $type = $directive->type;
-        if ($type != 'string' && $type != 'istring') {
+        if (HTMLPURIFIER_SCHEMA_STRICT && $type != 'string' && $type != 'istring') {
             trigger_error('Cannot define allowed values for directive whose type is not string',
                 E_USER_ERROR);
             return;
@@ -246,8 +265,11 @@ class HTMLPurifier_ConfigSchema {
         foreach ($allowed_values as $value) {
             $directive->allowed[$value] = true;
         }
-        if ($def->defaults[$namespace][$name] !== null &&
-            !isset($directive->allowed[$def->defaults[$namespace][$name]])) {
+        if (
+            HTMLPURIFIER_SCHEMA_STRICT &&
+            $def->defaults[$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!
@@ -263,8 +285,9 @@ class HTMLPurifier_ConfigSchema {
      * @param $new_namespace
      * @param $new_name Directive that the alias will be to
      */
-    function defineAlias($namespace, $name, $new_namespace, $new_name) {
+    static function defineAlias($namespace, $name, $new_namespace, $new_name) {
         $def =& HTMLPurifier_ConfigSchema::instance();
+        if (HTMLPURIFIER_SCHEMA_STRICT) {
             if (!isset($def->info[$namespace])) {
                 trigger_error('Cannot define directive alias in undefined namespace',
                     E_USER_ERROR);
@@ -290,9 +313,11 @@ class HTMLPurifier_ConfigSchema {
                     E_USER_ERROR);
                 return;
             }
+        }
         $def->info[$namespace][$name] =
             new HTMLPurifier_ConfigDef_DirectiveAlias(
                 $new_namespace, $new_name);
+        $def->info[$new_namespace][$new_name]->directiveAliases[] = "$namespace.$name";
     }
     
     /**
@@ -310,8 +335,10 @@ class HTMLPurifier_ConfigSchema {
                 return $var;
             case 'istring':
             case 'string':
+            case 'text': // no difference, just is longer/multiple line string
+            case 'itext':
                 if (!is_string($var)) break;
-                if ($type === 'istring') $var = strtolower($var);
+                if ($type === 'istring' || $type === 'itext') $var = strtolower($var);
                 return $var;
             case 'int':
                 if (is_string($var) && ctype_digit($var)) $var = (int) $var;
@@ -342,9 +369,13 @@ class HTMLPurifier_ConfigSchema {
                     // a single empty string item, but having an empty
                     // array is more intuitive
                     if ($var == '') return array();
+                    if (strpos($var, "\n") === false && strpos($var, "\r") === false) {
                         // simplistic string to array method that only works
                         // for simple lists of tag names or alphanumeric characters
                         $var = explode(',',$var);
+                    } else {
+                        $var = preg_split('/(,|[\n\r]+)/', $var);
+                    }
                     // remove spaces
                     foreach ($var as $i => $j) $var[$i] = trim($j);
                     if ($type === 'hash') {
@@ -385,6 +416,7 @@ class HTMLPurifier_ConfigSchema {
      * Takes an absolute path and munges it into a more manageable relative path
      */
     function mungeFilename($filename) {
+        if (!HTMLPURIFIER_SCHEMA_STRICT) return $filename;
         $offset = strrpos($filename, 'HTMLPurifier');
         $filename = substr($filename, $offset);
         $filename = str_replace('\\', '/', $filename);
@@ -396,9 +428,9 @@ class HTMLPurifier_ConfigSchema {
      */
     function isError($var) {
         if (!is_object($var)) return false;
-        if (!is_a($var, 'HTMLPurifier_Error')) return false;
+        if (!($var instanceof HTMLPurifier_Error)) return false;
         return true;
     }
 }
 
-?>
+

library/HTMLPurifier/ContentSets.php

@@ -5,6 +5,7 @@ require_once 'HTMLPurifier/ChildDef.php';
 require_once 'HTMLPurifier/ChildDef/Empty.php';
 require_once 'HTMLPurifier/ChildDef/Required.php';
 require_once 'HTMLPurifier/ChildDef/Optional.php';
+require_once 'HTMLPurifier/ChildDef/Custom.php';
 
 // NOT UNIT TESTED!!!
 
@@ -147,4 +148,3 @@ class HTMLPurifier_ContentSets
     
 }
 
-?>

library/HTMLPurifier/Context.php

@@ -2,6 +2,8 @@
 
 /**
  * Registry object that contains information about the current context.
+ * @warning Is a bit buggy when variables are set to null: it thinks
+ *          they don't exist! So use false instead, please.
  */
 class HTMLPurifier_Context
 {
@@ -19,7 +21,7 @@ class HTMLPurifier_Context
      */
     function register($name, &$ref) {
         if (isset($this->_storage[$name])) {
-            trigger_error('Name collision, cannot re-register',
+            trigger_error("Name $name produces collision, cannot re-register",
                           E_USER_ERROR);
             return;
         }
@@ -29,11 +31,14 @@ class HTMLPurifier_Context
     /**
      * Retrieves a variable reference from the context.
      * @param $name String name
+     * @param $ignore_error Boolean whether or not to ignore error
      */
-    function &get($name) {
+    function &get($name, $ignore_error = false) {
         if (!isset($this->_storage[$name])) {
-            trigger_error('Attempted to retrieve non-existent variable',
+            if (!$ignore_error) {
+                trigger_error("Attempted to retrieve non-existent variable $name",
                               E_USER_ERROR);
+            }
             $var = null; // so we can return by reference
             return $var;
         }
@@ -46,7 +51,7 @@ class HTMLPurifier_Context
      */
     function destroy($name) {
         if (!isset($this->_storage[$name])) {
-            trigger_error('Attempted to destroy non-existent variable',
+            trigger_error("Attempted to destroy non-existent variable $name",
                           E_USER_ERROR);
             return;
         }
@@ -73,4 +78,3 @@ class HTMLPurifier_Context
     
 }
 
-?>

library/HTMLPurifier/Definition.php

@@ -38,4 +38,3 @@ class HTMLPurifier_Definition
     
 }
 
-?>