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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 Iterator; |
| 10 | use UnexpectedValueException; |
| 11 | use Wikimedia\CSS\Objects\ComponentValueList; |
| 12 | use Wikimedia\CSS\Objects\Token; |
| 13 | |
| 14 | /** |
| 15 | * Matcher that matches a sub-Matcher a certain number of times |
| 16 | * ("?", "*", "+", "#", "{A,B}" multipliers) |
| 17 | * @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#component-multipliers |
| 18 | */ |
| 19 | class Quantifier extends Matcher { |
| 20 | /** @var Matcher */ |
| 21 | protected $matcher; |
| 22 | |
| 23 | /** @var int */ |
| 24 | protected $min; |
| 25 | |
| 26 | /** @var int */ |
| 27 | protected $max; |
| 28 | |
| 29 | /** @var bool Whether matches are comma-separated */ |
| 30 | protected $commas; |
| 31 | |
| 32 | /** |
| 33 | * @param Matcher $matcher |
| 34 | * @param int|float $min Minimum number of matches |
| 35 | * @param int|float $max Maximum number of matches |
| 36 | * @param bool $commas Whether matches are comma-separated |
| 37 | */ |
| 38 | public function __construct( Matcher $matcher, $min, $max, $commas ) { |
| 39 | $this->matcher = $matcher; |
| 40 | $this->min = $min; |
| 41 | $this->max = $max; |
| 42 | $this->commas = (bool)$commas; |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * Implements "?": 0 or 1 matches |
| 47 | * @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#mult-opt |
| 48 | * @param Matcher $matcher |
| 49 | * @return static |
| 50 | */ |
| 51 | public static function optional( Matcher $matcher ) { |
| 52 | return new static( $matcher, 0, 1, false ); |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Implements "*": 0 or more matches |
| 57 | * @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#mult-zero-plus |
| 58 | * @param Matcher $matcher |
| 59 | * @return static |
| 60 | */ |
| 61 | public static function star( Matcher $matcher ) { |
| 62 | return new static( $matcher, 0, INF, false ); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Implements "+": 1 or more matches |
| 67 | * @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#mult-one-plus |
| 68 | * @param Matcher $matcher |
| 69 | * @return static |
| 70 | */ |
| 71 | public static function plus( Matcher $matcher ) { |
| 72 | return new static( $matcher, 1, INF, false ); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Implements "{A,B}": Between A and B matches |
| 77 | * @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#mult-num-range |
| 78 | * @param Matcher $matcher |
| 79 | * @param int|float $min Minimum number of matches |
| 80 | * @param int|float $max Maximum number of matches |
| 81 | * @return static |
| 82 | */ |
| 83 | public static function count( Matcher $matcher, $min, $max ) { |
| 84 | return new static( $matcher, $min, $max, false ); |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Implements "#" and "#{A,B}": Between A and B matches, comma-separated |
| 89 | * @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#mult-comma |
| 90 | * @param Matcher $matcher |
| 91 | * @param int|float $min Minimum number of matches |
| 92 | * @param int|float $max Maximum number of matches |
| 93 | * @return static |
| 94 | */ |
| 95 | public static function hash( Matcher $matcher, $min = 1, $max = INF ) { |
| 96 | return new static( $matcher, $min, $max, true ); |
| 97 | } |
| 98 | |
| 99 | /** @inheritDoc */ |
| 100 | protected function generateMatches( ComponentValueList $values, $start, array $options ) { |
| 101 | $used = []; |
| 102 | |
| 103 | // Maintain a stack of matches for backtracking purposes. |
| 104 | $stack = [ |
| 105 | [ |
| 106 | new GrammarMatch( $values, $start, 0 ), |
| 107 | $this->matcher->generateMatches( $values, $start, $options ) |
| 108 | ] |
| 109 | ]; |
| 110 | do { |
| 111 | /** @var $lastMatch GrammarMatch */ |
| 112 | /** @var $iter Iterator<GrammarMatch> */ |
| 113 | [ $lastMatch, $iter ] = $stack[count( $stack ) - 1]; |
| 114 | |
| 115 | // If the top of the stack has no more matches, pop it, maybe |
| 116 | // yield the last matched position, and loop. |
| 117 | if ( !$iter->valid() ) { |
| 118 | array_pop( $stack ); |
| 119 | $ct = count( $stack ); |
| 120 | $pos = $lastMatch->getNext(); |
| 121 | if ( $ct >= $this->min && $ct <= $this->max ) { |
| 122 | $newMatch = $this->makeMatch( $values, $start, $pos, $lastMatch, $stack ); |
| 123 | $mid = $newMatch->getUniqueID(); |
| 124 | if ( !isset( $used[$mid] ) ) { |
| 125 | $used[$mid] = 1; |
| 126 | yield $newMatch; |
| 127 | } |
| 128 | } |
| 129 | continue; |
| 130 | } |
| 131 | |
| 132 | // Find the next match for the current top of the stack. |
| 133 | $match = $iter->current(); |
| 134 | $iter->next(); |
| 135 | |
| 136 | // Quantifiers don't work well when the quantified thing can be empty. |
| 137 | if ( $match->getLength() === 0 ) { |
| 138 | throw new UnexpectedValueException( 'Empty match in quantifier!' ); |
| 139 | } |
| 140 | |
| 141 | $nextFrom = $match->getNext(); |
| 142 | |
| 143 | // There can only be more matches after this one if we haven't |
| 144 | // reached our maximum yet. |
| 145 | $canBeMore = count( $stack ) < $this->max; |
| 146 | |
| 147 | // Commas are slightly tricky: |
| 148 | // 1. If there is a following comma, start the next Matcher after it. |
| 149 | // 2. If not, there can't be any more Matchers following. |
| 150 | // And in either case optional whitespace is always allowed. |
| 151 | if ( $this->commas ) { |
| 152 | $n = $nextFrom; |
| 153 | if ( isset( $values[$n] ) && $values[$n] instanceof Token && |
| 154 | // @phan-suppress-next-line PhanNonClassMethodCall False positive |
| 155 | $values[$n]->type() === Token::T_WHITESPACE |
| 156 | ) { |
| 157 | $n = $this->next( $values, $n, [ 'skip-whitespace' => true ] + $options ); |
| 158 | } |
| 159 | if ( isset( $values[$n] ) && $values[$n] instanceof Token && |
| 160 | // @phan-suppress-next-line PhanNonClassMethodCall False positive |
| 161 | $values[$n]->type() === Token::T_COMMA |
| 162 | ) { |
| 163 | $nextFrom = $this->next( $values, $n, [ 'skip-whitespace' => true ] + $options ); |
| 164 | } else { |
| 165 | $canBeMore = false; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | // If there can be more matches, push another one onto the stack |
| 170 | // and try it. Otherwise, yield and continue with the current match. |
| 171 | if ( $canBeMore ) { |
| 172 | $stack[] = [ $match, $this->matcher->generateMatches( $values, $nextFrom, $options ) ]; |
| 173 | } else { |
| 174 | $ct = count( $stack ); |
| 175 | $pos = $match->getNext(); |
| 176 | if ( $ct >= $this->min && $ct <= $this->max ) { |
| 177 | $newMatch = $this->makeMatch( $values, $start, $pos, $match, $stack ); |
| 178 | $mid = $newMatch->getUniqueID(); |
| 179 | if ( !isset( $used[$mid] ) ) { |
| 180 | $used[$mid] = 1; |
| 181 | yield $newMatch; |
| 182 | } |
| 183 | } |
| 184 | } |
| 185 | } while ( $stack ); |
| 186 | } |
| 187 | } |