htmlpurifier/TODO

TODO List

= KEY ====================
    # Flagship
    - Regular
    ? Maybe I'll Do It
==========================

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!

2.1 release [Refactor, refactor!]
 - Configuration profiles: predefined directives set with one func call
 - Allow non-ASCII characters in font names
 - Explain how to use HTML Purifier in non-PHP languages / create
   a simple command line stub

2.2 release [Error'ed]
 # Error logging for filtering/cleanup procedures
 - XSS-attempt detection

2.3 release [Do What I Mean, Not What I Say]
 # Additional support for poorly written HTML
    - Microsoft Word HTML cleaning (i.e. MsoNormal, but research essential!)
    - Friendly strict handling of <address> (block -> <br>)
 - Remove redundant tags, ex. <u><u>Underlined</u></u>. Implementation notes:
    1. Analyzing which tags to remove duplicants
    2. Ensure attributes are merged into the parent tag
    3. Extend the tag exclusion system to specify whether or not the
    contents should be dropped or not (currently, there's code that could do
    something like this if it didn't drop the inner text too.)
 - Remove <span> tags that don't do anything (no attributes)
 - Remove empty inline tags<i></i>
 - Append something to duplicate IDs so they're still usable (impl. note: the
   dupe detector would also need to detect the suffix as well)

2.4 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
    - Smileys
 - 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
 - Convert RTL/LTR override characters to <bdo> tags, or vice versa on demand.
   Also, enable disabling of directionality

4.0 release [To XML and Beyond]
 - Extended HTML capabilities based on namespacing and tag transforms (COMPLEX)
    - Hooks for adding custom processors to custom namespaced tags and
      attributes, offer default implementation
    - Lots of documentation and samples

Ongoing
 - Lots of profiling, make it faster!
 - Plugins for major CMSes (COMPLEX)
    - phpBB
    - eFiction
    - more! (look for ones that use WYSIWYGs)
 - Complete basic smoketests

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
 - Abstract ChildDef_BlockQuote to work with all elements that only
   allow blocks in them, required or optional
 - Reorganize Unit Tests
    - 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

Requested

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