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d2fd193bc4
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@517 48356398-32a2-884e-a903-53898d9a118a
67 lines
2.6 KiB
PHP
67 lines
2.6 KiB
PHP
<?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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* Tells us whether or not an HTML attribute is minimized. Only the
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* boolean attribute vapourware would use this.
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*/
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var $minimized = false;
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/**
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* Validates and cleans passed string according to a definition.
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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, as those extra characters usually have
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* already been removed by HTMLPurifier_Encoder.
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*
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* @warning This processing is inconsistent with XML's whitespace handling
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* as specified by section 3.3.3 and referenced XHTML 1.0 section
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* 4.7. Compliant processing requires all line breaks normalized
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* to "\n", so the fix is not as simple as fixing it in this
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* function. Trim and whitespace collapsing are supposed to only
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* occur in NMTOKENs. However, note that we are NOT necessarily
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* parsing XML, thus, this behavior may still be correct.
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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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