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htmlpurifier/library/HTMLPurifier/AttrDef.php

67 lines
2.6 KiB
PHP

<?php
/**
* Base class for all validating attribute definitions.
*
* This family of classes forms the core for not only HTML attribute validation,
* but also any sort of string that needs to be validated or cleaned (which
* means CSS properties and composite definitions are defined here too).
* Besides defining (through code) what precisely makes the string valid,
* subclasses are also responsible for cleaning the code if possible.
*/
class HTMLPurifier_AttrDef
{
/**
* Tells us whether or not an HTML attribute is minimized. Only the
* boolean attribute vapourware would use this.
*/
var $minimized = false;
/**
* Validates and cleans passed string according to a definition.
*
* @public
* @param $string String to be validated and cleaned.
* @param $config Mandatory HTMLPurifier_Config object.
* @param $context Mandatory HTMLPurifier_AttrContext object.
*/
function validate($string, $config, &$context) {
trigger_error('Cannot call abstract function', E_USER_ERROR);
}
/**
* Convenience method that parses a string as if it were CDATA.
*
* This method process a string in the manner specified at
* <http://www.w3.org/TR/html4/types.html#h-6.2> by removing
* leading and trailing whitespace, ignoring line feeds, and replacing
* carriage returns and tabs with spaces. While most useful for HTML
* attributes specified as CDATA, it can also be applied to most CSS
* values.
*
* @note This method is not entirely standards compliant, as trim() removes
* more types of whitespace than specified in the spec. In practice,
* this is rarely a problem, as those extra characters usually have
* already been removed by HTMLPurifier_Encoder.
*
* @warning This processing is inconsistent with XML's whitespace handling
* as specified by section 3.3.3 and referenced XHTML 1.0 section
* 4.7. Compliant processing requires all line breaks normalized
* to "\n", so the fix is not as simple as fixing it in this
* function. Trim and whitespace collapsing are supposed to only
* occur in NMTOKENs. However, note that we are NOT necessarily
* parsing XML, thus, this behavior may still be correct.
*
* @public
*/
function parseCDATA($string) {
$string = trim($string);
$string = str_replace("\n", '', $string);
$string = str_replace(array("\r", "\t"), ' ', $string);
return $string;
}
}
?>