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<?php declare(strict_types=1); |
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/** |
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* @license http://opensource.org/licenses/mit-license.php MIT |
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* @link https://github.com/nicoSWD |
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* @author Nicolas Oelgart <[email protected]> |
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*/ |
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namespace nicoSWD\Rule\Evaluator; |
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final class Evaluator implements EvaluatorInterface |
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{ |
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private const LOGICAL_AND = '&'; |
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private const LOGICAL_OR = '|'; |
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private const BOOL_TRUE = '1'; |
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private const BOOL_FALSE = '0'; |
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186 |
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public function evaluate(string $group): bool |
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{ |
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$evalGroup = $this->evalGroup(); |
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186 |
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$count = 0; |
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do { |
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186 |
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$group = preg_replace_callback( |
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'~\(([^()]+)\)~', |
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$evalGroup, |
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$group, |
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limit: -1, |
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count: $count |
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); |
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186 |
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} while ($count > 0); |
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return (bool) $evalGroup([1 => $group]); |
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} |
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private function evalGroup(): callable |
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{ |
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return function (array $group): ?int { |
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186 |
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$result = null; |
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$operator = null; |
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186 |
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$offset = 0; |
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while (isset($group[1][$offset])) { |
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$value = $group[1][$offset++]; |
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if ($this->isLogical($value)) { |
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$operator = $value; |
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184 |
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} elseif ($this->isBoolean($value)) { |
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$result = $this->setResult($result, (int) $value, $operator); |
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} else { |
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throw new Exception\UnknownSymbolException(sprintf('Unexpected "%s"', $value)); |
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} |
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} |
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return $result; |
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}; |
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} |
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private function setResult(?int $result, int $value, ?string $operator): int |
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{ |
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182 |
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if (!isset($result)) { |
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182 |
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$result = $value; |
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} elseif ($operator === self::LOGICAL_AND) { |
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$result &= $value; |
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} elseif ($operator === self::LOGICAL_OR) { |
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$result |= $value; |
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} |
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182 |
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return $result; |
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} |
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184 |
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private function isLogical(string $value): bool |
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{ |
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return $value === self::LOGICAL_AND || $value === self::LOGICAL_OR; |
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} |
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private function isBoolean(string $value): bool |
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{ |
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return $value === self::BOOL_TRUE || $value === self::BOOL_FALSE; |
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} |
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} |
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nicoSWD /
php-rule-parser
