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Refine Lexers for parsing stray angled brackets; %Core.AggressivelyFixLt = true

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By default, the DirectLex and DOMLex behavior with stray angled brackets
varied a great deal due to their implementations. A little known directive
%Core.AggressivelyFixLt attempted to match DOMLex's behavior with DirectLex's,
but it was off by default. By turning it on by default, users now enjoy these
benefits, and performance-minded users can turn it back off.

Also, several refinements to stray angled bracket parsing was made. Specifically:

* DirectLex: Handle each left angled bracket individually, which prevents
  strange behavior as reported by eon.
* DOMLex: Iterate aggressive lt fix, so that stacked brackets like << are
  handled.

Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
This commit is contained in:
Edward Z. Yang
2008-06-28 00:43:02 -04:00
parent ba418a1f19
commit aa0fdeee30
7 changed files with 86 additions and 29 deletions
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5
library/HTMLPurifier/Lexer/DOMLex.php
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@@ -45,7 +45,10 @@ class HTMLPurifier_Lexer_DOMLex extends HTMLPurifier_Lexer
$char = '[^a-z!\/]';
$comment = "/<!--(.*?)(-->|\z)/is";
$html = preg_replace_callback($comment, array($this, 'callbackArmorCommentEntities'), $html);
$html = preg_replace("/<($char)/i", '&lt;\\1', $html);
do {
$old = $html;
$html = preg_replace("/<($char)/i", '&lt;\\1', $html);
} while ($html !== $old);
$html = preg_replace_callback($comment, array($this, 'callbackUndoCommentSubst'), $html); // fix comments
}