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43 lines
1.2 KiB
PHP
43 lines
1.2 KiB
PHP
<?php
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/**
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* @file
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* @license https://opensource.org/licenses/Apache-2.0 Apache-2.0
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*/
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namespace Wikimedia\CSS\Grammar;
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use Wikimedia\CSS\Objects\ComponentValueList;
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use Wikimedia\CSS\Objects\Token;
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/**
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* Matcher that matches a token of a particular type
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* @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#component-types
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*/
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class TokenMatcher extends Matcher {
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/** @var string One of the Token::T_* constants */
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protected $type;
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/** @var callable|null Something to call to further validate the token */
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protected $callback = null;
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/**
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* @param string $type Token type to match
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* @param callable|null $callback Something to call to further validate the token.
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* bool callback( Token )
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*/
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public function __construct( $type, callable $callback = null ) {
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$this->type = $type;
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$this->callback = $callback;
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}
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/** @inheritDoc */
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protected function generateMatches( ComponentValueList $values, $start, array $options ) {
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$cv = $values[$start] ?? null;
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if ( $cv instanceof Token && $cv->type() === $this->type &&
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( !$this->callback || call_user_func( $this->callback, $cv ) )
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) {
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yield $this->makeMatch( $values, $start, $this->next( $values, $start, $options ) );
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}
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}
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}
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