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mirror of https://github.com/ezyang/htmlpurifier.git synced 2024-12-23 08:51:53 +00:00
htmlpurifier/library/HTMLPurifier/AttrValidator.php
Edward Z. Yang 69996acc9e [1.7.0] Add native support for required elements
- Factored out large portion of ValidateAttributes to AttrValidator
- Implemented ValidateAttributes armor
- Fix clear cache bug
- Implement armoring for ValidateAttributes

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1174 48356398-32a2-884e-a903-53898d9a118a
2007-06-20 21:39:28 +00:00

105 lines
3.8 KiB
PHP

<?php
class HTMLPurifier_AttrValidator
{
function validateToken($token, &$config, &$context) {
$definition = $config->getHTMLDefinition();
// create alias to global definition array, see also $defs
// DEFINITION CALL
$d_defs = $definition->info_global_attr;
// copy out attributes for easy manipulation
$attr = $token->attr;
// do global transformations (pre)
// nothing currently utilizes this
foreach ($definition->info_attr_transform_pre as $transform) {
$attr = $transform->transform($attr, $config, $context);
}
// do local transformations only applicable to this element (pre)
// ex. <p align="right"> to <p style="text-align:right;">
foreach ($definition->info[$token->name]->attr_transform_pre
as $transform
) {
$attr = $transform->transform($attr, $config, $context);
}
// create alias to this element's attribute definition array, see
// also $d_defs (global attribute definition array)
// DEFINITION CALL
$defs = $definition->info[$token->name]->attr;
// iterate through all the attribute keypairs
// Watch out for name collisions: $key has previously been used
foreach ($attr as $attr_key => $value) {
// call the definition
if ( isset($defs[$attr_key]) ) {
// there is a local definition defined
if ($defs[$attr_key] === false) {
// We've explicitly been told not to allow this element.
// This is usually when there's a global definition
// that must be overridden.
// Theoretically speaking, we could have a
// AttrDef_DenyAll, but this is faster!
$result = false;
} else {
// validate according to the element's definition
$result = $defs[$attr_key]->validate(
$value, $config, $context
);
}
} elseif ( isset($d_defs[$attr_key]) ) {
// there is a global definition defined, validate according
// to the global definition
$result = $d_defs[$attr_key]->validate(
$value, $config, $context
);
} else {
// system never heard of the attribute? DELETE!
$result = false;
}
// put the results into effect
if ($result === false || $result === null) {
// remove the attribute
unset($attr[$attr_key]);
} elseif (is_string($result)) {
// simple substitution
$attr[$attr_key] = $result;
}
// we'd also want slightly more complicated substitution
// involving an array as the return value,
// although we're not sure how colliding attributes would
// resolve (certain ones would be completely overriden,
// others would prepend themselves).
}
// post transforms
// ex. <x lang="fr"> to <x lang="fr" xml:lang="fr">
foreach ($definition->info_attr_transform_post as $transform) {
$attr = $transform->transform($attr, $config, $context);
}
// ex. <bdo> to <bdo dir="ltr">
foreach ($definition->info[$token->name]->attr_transform_post as $transform) {
$attr = $transform->transform($attr, $config, $context);
}
// commit changes
$token->attr = $attr;
return $token;
}
}
?>