MediaWiki 1.30.2

[autoinstallsdev/mediawiki.git] / vendor / wikimedia / css-sanitizer / src / Sanitizer / NamespaceAtRuleSanitizer.php

diff --git a/vendor/wikimedia/css-sanitizer/src/Sanitizer/NamespaceAtRuleSanitizer.php b/vendor/wikimedia/css-sanitizer/src/Sanitizer/NamespaceAtRuleSanitizer.php
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+<?php
+/**
+ * @file
+ * @license https://opensource.org/licenses/Apache-2.0 Apache-2.0
+ */
+
+namespace Wikimedia\CSS\Sanitizer;
+
+use Wikimedia\CSS\Grammar\Alternative;
+use Wikimedia\CSS\Grammar\Juxtaposition;
+use Wikimedia\CSS\Grammar\Matcher;
+use Wikimedia\CSS\Grammar\MatcherFactory;
+use Wikimedia\CSS\Grammar\Quantifier;
+use Wikimedia\CSS\Objects\AtRule;
+use Wikimedia\CSS\Objects\CSSObject;
+use Wikimedia\CSS\Objects\Rule;
+use Wikimedia\CSS\Util;
+
+/**
+ * Sanitizes a CSS \@namespace rule
+ * @see https://www.w3.org/TR/2014/REC-css-namespaces-3-20140320/
+ */
+class NamespaceAtRuleSanitizer extends RuleSanitizer {
+
+       /** @var Matcher */
+       protected $matcher;
+
+       /**
+        * @param MatcherFactory $matcherFactory
+        */
+       public function __construct( MatcherFactory $matcherFactory ) {
+               $this->matcher = new Juxtaposition( [
+                       Quantifier::optional( $matcherFactory->ident() ),
+                       new Alternative( [
+                               $matcherFactory->urlstring( 'namespace' ),
+                               $matcherFactory->url( 'namespace' ),
+                       ] ),
+               ] );
+       }
+
+       public function getIndex() {
+               return -900;
+       }
+
+       public function handlesRule( Rule $rule ) {
+               return $rule instanceof AtRule && !strcasecmp( $rule->getName(), 'namespace' );
+       }
+
+       protected function doSanitize( CSSObject $object ) {
+               if ( !$object instanceof Rule || !$this->handlesRule( $object ) ) {
+                       $this->sanitizationError( 'expected-at-rule', $object, [ 'namespace' ] );
+                       return null;
+               }
+
+               if ( $object->getBlock() !== null ) {
+                       $this->sanitizationError( 'at-rule-block-not-allowed', $object->getBlock(), [ 'namespace' ] );
+                       return null;
+               }
+               if ( !$this->matcher->match( $object->getPrelude(), [ 'mark-significance' => true ] ) ) {
+                       $cv = Util::findFirstNonWhitespace( $object->getPrelude() );
+                       if ( $cv ) {
+                               $this->sanitizationError( 'invalid-namespace-value', $cv );
+                       } else {
+                               $this->sanitizationError( 'missing-namespace-value', $object );
+                       }
+                       return null;
+               }
+               $object = $this->fixPreludeWhitespace( $object, true );
+
+               return $object;
+       }
+}