mirror of
https://github.com/ezyang/htmlpurifier.git
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Update documentation to new configuration format.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
This commit is contained in:
Edward Z. Yang
parent
5bf7ac4e9f
commit
77b60a4206
24
INSTALL
24
INSTALL
@ -231,12 +231,12 @@ HTML Purifier uses iconv to support other character encodings, as such,
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any encoding that iconv supports <http://www.gnu.org/software/libiconv/>
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HTML Purifier supports with this code:
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$config->set('Core', 'Encoding', /* put your encoding here */);
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$config->set('Core.Encoding', /* put your encoding here */);
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An example usage for Latin-1 websites (the most common encoding for English
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websites):
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$config->set('Core', 'Encoding', 'ISO-8859-1');
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$config->set('Core.Encoding', 'ISO-8859-1');
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Note that HTML Purifier's support for non-Unicode encodings is crippled by the
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fact that any character not supported by that encoding will be silently
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@ -251,7 +251,7 @@ reason, I do not include the solution in this document).
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For those of you using HTML 4.01 Transitional, you can disable
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XHTML output like this:
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$config->set('HTML', 'Doctype', 'HTML 4.01 Transitional');
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$config->set('HTML.Doctype', 'HTML 4.01 Transitional');
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Other supported doctypes include:
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@ -277,14 +277,14 @@ are, respectively, %HTML.Allowed, %URI.MakeAbsolute and %URI.Base, and
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%AutoFormat.AutoParagraph. The %Namespace.Directive naming convention
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translates to:
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$config->set('Namespace', 'Directive', $value);
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$config->set('Namespace.Directive', $value);
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E.g.
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$config->set('HTML', 'Allowed', 'p,b,a[href],i');
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$config->set('URI', 'Base', 'http://www.example.com');
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$config->set('URI', 'MakeAbsolute', true);
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$config->set('AutoFormat', 'AutoParagraph', true);
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$config->set('HTML.Allowed', 'p,b,a[href],i');
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$config->set('URI.Base', 'http://www.example.com');
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$config->set('URI.MakeAbsolute', true);
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$config->set('AutoFormat.AutoParagraph', true);
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---------------------------------------------------------------------------
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@ -318,11 +318,11 @@ If you are unable or unwilling to give write permissions to the cache
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directory, you can either disable the cache (and suffer a performance
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hit):
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$config->set('Core', 'DefinitionCache', null);
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$config->set('Core.DefinitionCache', null);
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Or move the cache directory somewhere else (no trailing slash):
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$config->set('Cache', 'SerializerPath', '/home/user/absolute/path');
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$config->set('Cache.SerializerPath', '/home/user/absolute/path');
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---------------------------------------------------------------------------
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@ -363,8 +363,8 @@ If your website is in a different encoding or doctype, use this code:
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require_once '/path/to/htmlpurifier/library/HTMLPurifier.auto.php';
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$config = HTMLPurifier_Config::createDefault();
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$config->set('Core', 'Encoding', 'ISO-8859-1'); // replace with your encoding
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$config->set('HTML', 'Doctype', 'HTML 4.01 Transitional'); // replace with your doctype
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$config->set('Core.Encoding', 'ISO-8859-1'); // replace with your encoding
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$config->set('HTML.Doctype', 'HTML 4.01 Transitional'); // replace with your doctype
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$purifier = new HTMLPurifier($config);
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$clean_html = $purifier->purify($dirty_html);
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9
TODO
9
TODO
@ -18,14 +18,13 @@ afraid to cast your vote for the next feature to be implemented!
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- Incorporate download and resize support as implemented here:
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http://htmlpurifier.org/phorum/read.php?3,2795,3628
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- Think about allowing explicit order of operations hooks for transforms
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- Make it dead easy for other authors to maintain their own configuration
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pools. Encourage them to namespace them (this flies counter to our
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"hey, let's use convention idea", so that's why the "register" extra
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field will end up being a good idea: because it means we can forgo
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convention for external things
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- Add "register" field to config schemas to eliminate dependence on
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naming conventions
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- Make it easy for people to cache their entire configuration (so that
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they have one script they run to change configuration, and then a stub
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loader to get that configuration)
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- Add examples to everything (make built-in which also automatically
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gives output)
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FUTURE VERSIONS
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---------------
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@ -17,202 +17,9 @@
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<div id="home"><a href="http://htmlpurifier.org/">HTML Purifier</a> End-User Documentation</div>
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<p>
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<strong>Warning:</strong> This document may be out-of-date. When in doubt,
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consult the source code documentation.
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Please see <a href="enduser-customize.html">Customize!</a>
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</p>
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<p>HTML Purifier currently natively supports only a subset of HTML's
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allowed elements, attributes, and behavior; specifically, this subset
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is the set of elements that are safe for untrusted users to use.
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However, HTML Purifier is often utilized to ensure standards-compliance
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from input that is trusted (making it a sort of Tidy substitute),
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and often users need to define new elements or attributes. The
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advanced API is oriented specifically for these use-cases.</p>
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<p>Our goals are to let the user:</p>
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<dl>
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<dt>Select</dt>
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<dd><ul>
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<li>Doctype</li>
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<!-- <li>Filterset</li> -->
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<li>Elements / Attributes / Modules</li>
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<li>Tidy</li>
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</ul></dd>
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<dt>Customize</dt>
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<dd><ul>
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<li>Attributes</li>
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<li>Elements</li>
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<!--<li>Doctypes</li>-->
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</ul></dd>
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</dl>
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<h2>Select</h2>
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<p>For basic use, the user will have to specify some basic parameters. This
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is not strictly necessary, as HTML Purifier's default setting will always
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output safe code, but is required for standards-compliant output.</p>
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<h3>Selecting a Doctype</h3>
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<p>The first thing to select is the <strong>doctype</strong>. This
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is essential for standards-compliant output.</p>
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<p class="technical">This identifier is based
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on the name the W3C has given to the document type and <em>not</em>
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the DTD identifier.</p>
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<p>This parameter is set via the configuration object:</p>
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<pre>$config->set('HTML', 'Doctype', 'XHTML 1.0 Transitional');</pre>
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<p>Due to historical reasons, the default doctype is XHTML 1.0
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Transitional, however, we really shouldn't be guessing what the user's
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doctype is. Fortunantely, people who can't be bothered to set this won't
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be bothered when their pages stop validating.</p>
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<h3>Selecting Elements / Attributes / Modules</h3>
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<p>HTML Purifier will, by default, allow as many elements and attributes
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as possible. However, a user may decide to roll their own filterset by
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selecting modules, elements and attributes to allow for their own
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specific use-case. This can be done using %HTML.Allowed:</p>
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<pre>$config->set('HTML', 'Allowed', 'a[href|title],em,p,blockquote');</pre>
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<p class="technical">The directive %HTML.Allowed is a convenience feature
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that may be fully expressed with the legacy interface.</p>
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<p>We currently support another interface from older versions:</p>
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<pre>$config->set('HTML', 'AllowedElements', 'a,em,p,blockquote');
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$config->set('HTML', 'AllowedAttributes', 'a.href,a.title');</pre>
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<p>A user may also choose to allow modules using a specialized
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directive:</p>
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<pre>$config->set('HTML', 'AllowedModules', 'Hypertext,Text,Lists');</pre>
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<p>But it is not expected that this feature will be widely used.</p>
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<p class="technical">Module selection will work slightly differently
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from the other AllowedElements and AllowedAttributes directives by
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directly modifying the doctype you are operating in, in the spirit of
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XHTML 1.1's modularization. We stop users from shooting themselves in the
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foot by mandating the modules in %HTML.CoreModules be used.</p>
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<p class="technical">Modules are distinguished from regular elements by the
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case of their first letter. While XML distinguishes between and allows
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lower and uppercase letters in element names, XHTML uses only lower-case
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element names for sake of consistency.</p>
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<h3>Selecting Tidy</h3>
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<p>The name of this segment of functionality is inspired off of Dave
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Ragget's program HTML Tidy, which purported to help clean up HTML. In
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HTML Purifier, Tidy functionality involves turning unsupported and
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deprecated elements into standards-compliant ones, maintaining
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backwards compatibility, and enforcing best practices.</p>
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<p>This is a complicated feature, and is explained more in depth at
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<a href="enduser-tidy.html">the Tidy documentation page</a>.</p>
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<!--
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<h3>Unified selector</h3>
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<p>Because selecting each and every one of these configuration options
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is a chore, we may wish to offer a specialized configuration method
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for selecting a filterset. Possibility:</p>
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<pre>function selectFilter($doctype, $filterset, $tidy)</pre>
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<p>...which is simply a light wrapper over the individual configuration
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calls. A custom config file format or text format could also be adopted.</p>
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-->
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<h2>Customize</h2>
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<p>By reviewing topic posts in the support forum, we determined that
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there were two primarily demanded customization features people wanted:
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to add an attribute to an existing element, and to add an element.
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Thus, we'll want to create convenience functions for these common
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use-cases.</p>
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<p>Note that the functions described here are only available if
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a raw copy of <code>HTMLPurifier_HTMLDefinition</code> was retrieved.
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Furthermore, caching may prevent your changes from immediately
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being seen: consult <a href="enduser-customize.html">enduser-customize.html</a> on how
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to work around this.</p>
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<h3>Attributes</h3>
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<p>An attribute is bound to an element by a name and has a specific
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<code>AttrDef</code> that validates it. The interface is therefore:</p>
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<pre>function addAttribute($element, $attribute, $attribute_def);</pre>
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<p>Example of the functionality in action:</p>
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<pre>$def->addAttribute('a', 'rel', 'Enum#nofollow');</pre>
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<p>The <code>$attribute_def</code> value is flexible,
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to make things simpler. It can be a literal object or:</p>
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<ul>
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<!--<li>Class name: We'll instantiate it for you</li>
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<li>Function name: We'll create an <code>HTMLPurifier_AttrDef_Anonymous</code>
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class with that function registered as a callback.</li>-->
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<li>String attribute type: We'll use <code>HTMLPurifier_AttrTypes</code>
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to resolve it for you. Any data that follows a hash mark (#) will
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be used to customize the attribute type: in the example above,
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we specify which values for Enum to allow.</li>
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</ul>
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<h3>Elements</h3>
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<p>An element requires certain information as specified by
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<code>HTMLPurifier_ElementDef</code>. However, not all of it is necessary,
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the usual things required are:</p>
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<ul>
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<li>Attributes</li>
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<li>Content model/type</li>
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<li>Registration in a content set</li>
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</ul>
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<p>This suggests an API like this:</p>
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<pre>function addElement($element, $type, $contents,
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$attr_collections = array(); $attributes = array());</pre>
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<p>Each parameter explained in depth:</p>
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<dl>
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<dt><code>$element</code></dt>
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<dd>Element name, ex. 'label'</dd>
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<dt><code>$type</code></dt>
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<dd>Content set to register in, ex. 'Inline' or 'Flow'</dd>
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<dt><code>$contents</code></dt>
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<dd>Description of allowed children. This is a merged form of
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<code>HTMLPurifier_ElementDef</code>'s member variables
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<code>$content_model</code> and <code>$content_model_type</code>,
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where the form is <q>Type: Model</q>, ex. 'Optional: Inline'.
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There are also a number of predefined templates one may use.</dd>
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<dt><code>$attr_collections</code></dt>
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<dd>Array (or string if only one) of attribute collection(s) to
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merge into the attributes array.</dd>
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<dt><code>$attributes</code></dt>
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<dd>Array of attribute names to attribute definitions, much like
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the above-described attribute customization.</dd>
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</dl>
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<p>A possible usage:</p>
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<pre>$def->addElement('font', 'Inline', 'Optional: Inline', 'Common',
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array('color' => 'Color'));</pre>
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<p>See <code>HTMLPurifier/HTMLModule.php</code> for details.</p>
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</body></html>
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<!-- vim: et sw=4 sts=4
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@ -155,9 +155,9 @@
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</p>
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<pre>$config = HTMLPurifier_Config::createDefault();
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$config->set('HTML', 'DefinitionID', 'enduser-customize.html tutorial');
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$config->set('HTML', 'DefinitionRev', 1);
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$def = $config->getHTMLDefinition(true);</pre>
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$config->set('HTML.DefinitionID', 'enduser-customize.html tutorial');
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$config->set('HTML.DefinitionRev', 1);
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$def = $config->getHTMLDefinition(true);</pre>
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<p>
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Assuming that HTML Purifier has already been properly loaded (hint:
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@ -210,10 +210,10 @@ $def = $config->getHTMLDefinition(true);</pre>
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</p>
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<pre>$config = HTMLPurifier_Config::createDefault();
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$config->set('HTML', 'DefinitionID', 'enduser-customize.html tutorial');
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$config->set('HTML', 'DefinitionRev', 1);
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<strong>$config->set('Cache', 'DefinitionImpl', null); // remove this later!</strong>
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$def = $config->getHTMLDefinition(true);</pre>
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$config->set('HTML.DefinitionID', 'enduser-customize.html tutorial');
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$config->set('HTML.DefinitionRev', 1);
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<strong>$config->set('Cache.DefinitionImpl', null); // TODO: remove this later!</strong>
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$def = $config->getHTMLDefinition(true);</pre>
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<p>
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A few things should be mentioned about the caching mechanism before
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@ -266,10 +266,10 @@ $def = $config->getHTMLDefinition(true);</pre>
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</p>
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<pre>$config = HTMLPurifier_Config::createDefault();
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$config->set('HTML', 'DefinitionID', 'enduser-customize.html tutorial');
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$config->set('HTML', 'DefinitionRev', 1);
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$config->set('Cache', 'DefinitionImpl', null); // remove this later!
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$def = $config->getHTMLDefinition(true);
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$config->set('HTML.DefinitionID', 'enduser-customize.html tutorial');
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$config->set('HTML.DefinitionRev', 1);
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$config->set('Cache.DefinitionImpl', null); // remove this later!
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$def = $config->getHTMLDefinition(true);
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<strong>$def->addAttribute('a', 'target', 'Enum#_blank,_self,_target,_top');</strong></pre>
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<p>
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@ -384,11 +384,11 @@ $def = $config->getHTMLDefinition(true);
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</p>
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<pre>$config = HTMLPurifier_Config::createDefault();
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$config->set('HTML', 'DefinitionID', 'enduser-customize.html tutorial');
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$config->set('HTML', 'DefinitionRev', 1);
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$config->set('Cache', 'DefinitionImpl', null); // remove this later!
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$def = $config->getHTMLDefinition(true);
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<strong>$def->addAttribute('a', 'target', new HTMLPurifier_AttrDef_Enum(
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$config->set('HTML.DefinitionID', 'enduser-customize.html tutorial');
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$config->set('HTML.DefinitionRev', 1);
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$config->set('Cache.DefinitionImpl', null); // remove this later!
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$def = $config->getHTMLDefinition(true);
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<strong>$def->addAttribute('a', 'target', new HTMLPurifier_AttrDef_Enum(
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array('_blank','_self','_target','_top')
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));</strong></pre>
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@ -731,14 +731,14 @@ $def = $config->getHTMLDefinition(true);
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</p>
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<pre>$config = HTMLPurifier_Config::createDefault();
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$config->set('HTML', 'DefinitionID', 'enduser-customize.html tutorial');
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$config->set('HTML', 'DefinitionRev', 1);
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$config->set('Cache', 'DefinitionImpl', null); // remove this later!
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$def = $config->getHTMLDefinition(true);
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$def->addAttribute('a', 'target', new HTMLPurifier_AttrDef_Enum(
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$config->set('HTML.DefinitionID', 'enduser-customize.html tutorial');
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$config->set('HTML.DefinitionRev', 1);
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$config->set('Cache.DefinitionImpl', null); // remove this later!
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$def = $config->getHTMLDefinition(true);
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$def->addAttribute('a', 'target', new HTMLPurifier_AttrDef_Enum(
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array('_blank','_self','_target','_top')
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));
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<strong>$form = $def->addElement(
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<strong>$form = $def->addElement(
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'form', // name
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'Block', // content set
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'Flow', // allowed children
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@ -749,7 +749,7 @@ $def->addAttribute('a', 'target', new HTMLPurifier_AttrDef_Enum(
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'name' => 'ID'
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)
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);
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$form->excludes = array('form' => true);</strong></pre>
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$form->excludes = array('form' => true);</strong></pre>
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<p>
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Each of the parameters corresponds to one of the questions we asked.
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@ -31,7 +31,7 @@ by default.</p>
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<p>IDs, however, are quite useful functionality to have, so if users start
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complaining about broken anchors you'll probably want to turn them back on
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with %HTML.EnableAttrID. But before you go mucking around with the config
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with %Attr.EnableID. But before you go mucking around with the config
|
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object, it's probably worth to take some precautions to keep your page
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validating. Why?</p>
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@ -56,8 +56,8 @@ validating. Why?</p>
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deal with the most obvious solution: preventing users from using any IDs that
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appear elsewhere on the document. The method is simple:</p>
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<pre>$config->set('HTML', 'EnableAttrID', true);
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$config->set('Attr', 'IDBlacklist' array(
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<pre>$config->set('Attr.EnableID', true);
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$config->set('Attr.IDBlacklist' array(
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'list', 'of', 'attribute', 'values', 'that', 'are', 'forbidden'
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));</pre>
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@ -88,8 +88,8 @@ all, they might have simply specified a duplicate ID by accident.</p>
|
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<p>This method, too, is quite simple: add a prefix to all user IDs. With this
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code:</p>
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<pre>$config->set('HTML', 'EnableAttrID', true);
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$config->set('Attr', 'IDPrefix', 'user_');</pre>
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<pre>$config->set('Attr.EnableID', true);
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$config->set('Attr.IDPrefix', 'user_');</pre>
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<p>...this:</p>
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|
||||
@ -109,7 +109,7 @@ user_ to the beginning."</p>
|
||||
nothing about multiple HTML Purifier outputs on one page. Thus, we have
|
||||
a second configuration value to piggy-back off of: %Attr.IDPrefixLocal:</p>
|
||||
|
||||
<pre>$config->set('Attr', 'IDPrefixLocal', 'comment' . $id . '_');</pre>
|
||||
<pre>$config->set('Attr.IDPrefixLocal', 'comment' . $id . '_');</pre>
|
||||
|
||||
<p>This new attributes does nothing but append on to regular IDPrefix, but is
|
||||
special in that it is volatile: it's value is determined at run-time and
|
||||
@ -137,7 +137,7 @@ anchors is beyond me.</p>
|
||||
|
||||
<p>To revert back to pre-1.2.0 behavior, simply:</p>
|
||||
|
||||
<pre>$config->set('HTML', 'EnableAttrID', true);</pre>
|
||||
<pre>$config->set('Attr.EnableID', true);</pre>
|
||||
|
||||
<p>Don't come crying to me when your page mysteriously stops validating, though.</p>
|
||||
|
||||
|
||||
@ -76,7 +76,7 @@ associated with it, although it may change depending on your doctype.</p>
|
||||
change the level of cleaning by setting the %HTML.TidyLevel configuration
|
||||
directive:</p>
|
||||
|
||||
<pre>$config->set('HTML', 'TidyLevel', 'heavy'); // burn baby burn!</pre>
|
||||
<pre>$config->set('HTML.TidyLevel', 'heavy'); // burn baby burn!</pre>
|
||||
|
||||
<h2>Is the light level really light?</h2>
|
||||
|
||||
@ -165,17 +165,17 @@ smoketest</a>.</p>
|
||||
so happy about the br@clear implementation. That's perfectly fine!
|
||||
HTML Purifier will make accomodations:</p>
|
||||
|
||||
<pre>$config->set('HTML', 'Doctype', 'XHTML 1.0 Transitional');
|
||||
$config->set('HTML', 'TidyLevel', 'heavy'); // all changes, minus...
|
||||
<strong>$config->set('HTML', 'TidyRemove', 'br@clear');</strong></pre>
|
||||
<pre>$config->set('HTML.Doctype', 'XHTML 1.0 Transitional');
|
||||
$config->set('HTML.TidyLevel', 'heavy'); // all changes, minus...
|
||||
<strong>$config->set('HTML.TidyRemove', 'br@clear');</strong></pre>
|
||||
|
||||
<p>That third line does the magic, removing the br@clear fix
|
||||
from the module, ensuring that <code><br clear="both" /></code>
|
||||
will pass through unharmed. The reverse is possible too:</p>
|
||||
|
||||
<pre>$config->set('HTML', 'Doctype', 'XHTML 1.0 Transitional');
|
||||
$config->set('HTML', 'TidyLevel', 'none'); // no changes, plus...
|
||||
<strong>$config->set('HTML', 'TidyAdd', 'p@align');</strong></pre>
|
||||
<pre>$config->set('HTML.Doctype', 'XHTML 1.0 Transitional');
|
||||
$config->set('HTML.TidyLevel', 'none'); // no changes, plus...
|
||||
<strong>$config->set('HTML.TidyAdd', 'p@align');</strong></pre>
|
||||
|
||||
<p>In this case, all transformations are shut off, except for the p@align
|
||||
one, which you found handy.</p>
|
||||
|
||||
@ -75,7 +75,7 @@ passes through HTML Purifier <em>unharmed</em>.
|
||||
<p>And the corresponding usage:</p>
|
||||
|
||||
<pre><?php
|
||||
$config->set('Filter', 'YouTube', true);
|
||||
$config->set('Filter.YouTube', true);
|
||||
?></pre>
|
||||
|
||||
<p>There is a bit going in the two code snippets, so let's explain.</p>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user