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66ddc4cc5a
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@293 48356398-32a2-884e-a903-53898d9a118a
57 lines
1.9 KiB
PHP
57 lines
1.9 KiB
PHP
<?php
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require_once 'HTMLPurifier/AttrContext.php';
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/**
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* Base class for all validating attribute definitions.
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*
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* This family of classes forms the core for not only HTML attribute validation,
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* but also any sort of string that needs to be validated or cleaned (which
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* means CSS properties and composite definitions are defined here too).
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* Besides defining (through code) what precisely makes the string valid,
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* subclasses are also responsible for cleaning the code if possible.
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*/
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class HTMLPurifier_AttrDef
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{
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/**
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* Abstract function defined for functions that validate and clean strings.
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*
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* This function forms the basis for all the subclasses: they must
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* define this method.
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*
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* @public
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* @param $string String to be validated and cleaned.
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* @param $config Mandatory HTMLPurifier_Config object.
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* @param $context Mandatory HTMLPurifier_AttrContext object.
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*/
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function validate($string, $config, &$context) {
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trigger_error('Cannot call abstract function', E_USER_ERROR);
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}
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/**
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* Convenience method that parses a string as if it were CDATA.
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*
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* This method process a string in the manner specified at
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* <http://www.w3.org/TR/html4/types.html#h-6.2> by removing
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* leading and trailing whitespace, ignoring line feeds, and replacing
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* carriage returns and tabs with spaces. While most useful for HTML
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* attributes specified as CDATA, it can also be applied to most CSS
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* values.
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*
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* @note This method is not entirely standards compliant, as trim() removes
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* more types of whitespace than specified in the spec. In practice,
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* this is rarely a problem.
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*
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* @public
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*/
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function parseCDATA($string) {
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$string = trim($string);
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$string = str_replace("\n", '', $string);
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$string = str_replace(array("\r", "\t"), ' ', $string);
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return $string;
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}
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}
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?>
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