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<?php |
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/** |
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* This file is part of PHP-Yacc package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace PhpYacc\Lalr; |
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/** |
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* Class ArrayBitset. |
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*/ |
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class ArrayBitSet implements BitSet |
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{ |
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const BITS = \PHP_INT_SIZE * 8; |
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/** |
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* @var int |
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*/ |
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public $numBits; |
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/** |
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* @var array |
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*/ |
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public $array; |
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/** |
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* ArrayBitset constructor. |
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* |
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* @param int $numBits |
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*/ |
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public function __construct(int $numBits) |
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{ |
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$this->numBits = $numBits; |
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$this->array = \array_fill(0, intdiv($numBits + self::BITS - 1, self::BITS), 0); |
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} |
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/** |
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* @return void |
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*/ |
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public function __clone() |
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{ |
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$this->array = \array_values($this->array); |
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} |
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/** |
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* @param int $i |
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* |
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* @return bool |
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*/ |
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public function testBit(int $i): bool |
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{ |
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return ($this->array[$i / self::BITS] & (1 << ($i % self::BITS))) !== 0; |
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} |
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/** |
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* @param int $i |
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*/ |
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public function setBit(int $i) |
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{ |
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$this->array[$i / self::BITS] |= (1 << ($i % self::BITS)); |
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} |
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/** |
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* @param int $i |
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*/ |
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public function clearBit(int $i) |
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{ |
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$this->array[$i / self::BITS] &= ~(1 << ($i % self::BITS)); |
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} |
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/** |
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* @param BitSet $other |
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* |
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* @return bool |
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*/ |
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public function or(BitSet $other): bool |
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{ |
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/* @var $other ArrayBitSet */ |
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assert($this->numBits === $other->numBits); |
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$changed = false; |
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foreach ($this->array as $key => $value) { |
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$this->array[$key] = $value | $other->array[$key]; |
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$changed = $changed || $value !== $this->array[$key]; |
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} |
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return $changed; |
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} |
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/** |
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* @return \Generator |
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*/ |
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public function getIterator(): \Generator |
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{ |
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$count = \count($this->array); |
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for ($n = 0; $n < $count; $n++) { |
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$elem = $this->array[$n]; |
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if ($elem !== 0) { |
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for ($i = 0; $i < self::BITS; $i++) { |
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if ($elem & (1 << $i)) { |
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yield $n * self::BITS + $i; |
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} |
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} |
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} |
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} |
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} |
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} |
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stenin-nikita /
PHP-Yacc
