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| 1 | <?php |
| 2 | /** |
| 3 | * @file |
| 4 | * @license https://opensource.org/licenses/Apache-2.0 Apache-2.0 |
| 5 | */ |
| 6 | |
| 7 | namespace Wikimedia\CSS\Grammar; |
| 8 | |
| 9 | use InvalidArgumentException; |
| 10 | use Wikimedia\CSS\Objects\ComponentValueList; |
| 11 | use Wikimedia\CSS\Objects\SimpleBlock; |
| 12 | |
| 13 | /** |
| 14 | * Matcher that matches a SimpleBlock |
| 15 | * |
| 16 | * The grammar definitions in the standards seem to be written assuming they're |
| 17 | * being passed a sequence of Tokens only, even though they're defined over a |
| 18 | * sequence of ComponentValues (which includes SimpleBlocks and CSSFunctions) |
| 19 | * instead. |
| 20 | * |
| 21 | * Thus, to be safe you'll want to use this when a grammar specifies something |
| 22 | * like `'[' <stuff> ']'`. |
| 23 | */ |
| 24 | class BlockMatcher extends Matcher { |
| 25 | /** @var string One of the Token::T_* constants */ |
| 26 | protected $blockType; |
| 27 | |
| 28 | /** @var Matcher */ |
| 29 | protected $matcher; |
| 30 | |
| 31 | /** |
| 32 | * @param string $blockType One of the Token::T_* constants |
| 33 | * @param Matcher $matcher Matcher for the contents of the block |
| 34 | */ |
| 35 | public function __construct( $blockType, Matcher $matcher ) { |
| 36 | if ( SimpleBlock::matchingDelimiter( $blockType ) === null ) { |
| 37 | throw new InvalidArgumentException( |
| 38 | 'A block is delimited by either {}, [], or ().' |
| 39 | ); |
| 40 | } |
| 41 | $this->blockType = $blockType; |
| 42 | $this->matcher = $matcher; |
| 43 | } |
| 44 | |
| 45 | /** @inheritDoc */ |
| 46 | protected function generateMatches( ComponentValueList $values, $start, array $options ) { |
| 47 | $cv = $values[$start] ?? null; |
| 48 | if ( $cv instanceof SimpleBlock && $cv->getStartTokenType() === $this->blockType ) { |
| 49 | // To successfully match, our sub-Matcher needs to match the whole |
| 50 | // content of the block. |
| 51 | $l = $cv->getValue()->count(); |
| 52 | $s = $this->next( $cv->getValue(), -1, $options ); |
| 53 | foreach ( $this->matcher->generateMatches( $cv->getValue(), $s, $options ) as $match ) { |
| 54 | if ( $match->getNext() === $l ) { |
| 55 | // Matched the whole content of the block, so yield the |
| 56 | // token after the block. |
| 57 | yield $this->makeMatch( $values, $start, $this->next( $values, $start, $options ), $match ); |
| 58 | return; |
| 59 | } |
| 60 | } |
| 61 | } |
| 62 | } |
| 63 | } |