MediaWiki 1.30.2

[autoinstallsdev/mediawiki.git] / vendor / wikimedia / css-sanitizer / src / Grammar / FunctionMatcher.php

diff --git a/vendor/wikimedia/css-sanitizer/src/Grammar/FunctionMatcher.php b/vendor/wikimedia/css-sanitizer/src/Grammar/FunctionMatcher.php
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+<?php
+/**
+ * @file
+ * @license https://opensource.org/licenses/Apache-2.0 Apache-2.0
+ */
+
+namespace Wikimedia\CSS\Grammar;
+
+use Wikimedia\CSS\Objects\ComponentValueList;
+use Wikimedia\CSS\Objects\CSSFunction;
+use Wikimedia\CSS\Objects\Token;
+
+/**
+ * Matcher that matches a CSSFunction
+ *
+ * The grammar definitions in the standards seem to be written assuming they're
+ * being passed a sequence of Tokens only, even though they're defined over a
+ * sequence of ComponentValues (which includes SimpleBlocks and CSSFunctions)
+ * instead.
+ *
+ * Thus, to be safe you'll want to use this when a grammar specifies something
+ * like `FUNCTION <stuff> ')'`.
+ */
+class FunctionMatcher extends Matcher {
+       /** @var callable|null Function name */
+       protected $nameCheck;
+
+       /** @var Matcher */
+       protected $matcher;
+
+       /**
+        * @param string|callable|null $name Function name, case-insensitive, or a
+        *  function to check the name.
+        * @param Matcher $matcher Matcher for the contents of the function
+        */
+       public function __construct( $name, Matcher $matcher ) {
+               if ( is_string( $name ) ) {
+                       $this->nameCheck = function ( $s ) use ( $name ) {
+                               return !strcasecmp( $s, $name );
+                       };
+               } elseif ( is_callable( $name ) || $name === null ) {
+                       $this->nameCheck = $name;
+               } else {
+                       throw new \InvalidArgumentException( '$name must be a string, callable, or null' );
+               }
+               $this->matcher = $matcher;
+       }
+
+       protected function generateMatches( ComponentValueList $values, $start, array $options ) {
+               $cv = isset( $values[$start] ) ? $values[$start] : null;
+               if ( $cv instanceof CSSFunction &&
+                       ( !$this->nameCheck || call_user_func( $this->nameCheck, $cv->getName() ) )
+               ) {
+                       // To successfully match, our sub-Matcher needs to match the whole
+                       // content of the function.
+                       $l = $cv->getValue()->count();
+                       $s = $this->next( $cv->getValue(), -1, $options );
+                       foreach ( $this->matcher->generateMatches( $cv->getValue(), $s, $options ) as $match ) {
+                               if ( $match->getNext() === $l ) {
+                                       // Matched the whole content of the function, so yield the
+                                       // token after the function.
+                                       yield $this->makeMatch( $values, $start, $this->next( $values, $start, $options ), $match );
+                                       return;
+                               }
+                       }
+               }
+       }
+}