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<?php |
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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\Parser; |
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use nicoSWD\Rule\Compiler\CompilerInterface; |
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use nicoSWD\Rule\Compiler\CompilerFactoryInterface; |
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use nicoSWD\Rule\Compiler\Exception\MissingOperatorException; |
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use nicoSWD\Rule\Expression\ExpressionFactoryInterface; |
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use nicoSWD\Rule\TokenStream\AST; |
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use nicoSWD\Rule\TokenStream\Token\BaseToken; |
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use SplStack; |
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class Parser |
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{ |
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/** @var AST */ |
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private $ast; |
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/** @var ExpressionFactoryInterface */ |
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private $expressionFactory; |
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/** @var CompilerFactoryInterface */ |
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private $compilerFactory; |
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/** @var null|BaseToken */ |
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private $operator = null; |
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220 |
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public function __construct( |
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AST $ast, |
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ExpressionFactoryInterface $expressionFactory, |
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CompilerFactoryInterface $compilerFactory |
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) { |
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$this->ast = $ast; |
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$this->expressionFactory = $expressionFactory; |
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$this->compilerFactory = $compilerFactory; |
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} |
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220 |
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public function parse(string $rule): string |
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{ |
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$compiler = $this->compilerFactory->create(); |
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220 |
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$this->operator = null; |
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220 |
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$values = new SplStack(); |
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220 |
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foreach ($this->ast->getStream($rule) as $token) { |
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if ($token->isValue()) { |
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$values->push($token->getValue()); |
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} elseif ($token->isWhitespace()) { |
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continue; |
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} elseif ($token->isOperator()) { |
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$this->assignOperator($token, $values); |
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} elseif ($token->isLogical()) { |
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$compiler->addLogical($token); |
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} elseif ($token->isParenthesis()) { |
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$compiler->addParentheses($token); |
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} else { |
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throw Exception\ParserException::unknownToken($token); |
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} |
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$this->evaluateExpression($values, $compiler); |
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} |
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return $compiler->getCompiledRule(); |
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} |
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180 |
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private function assignOperator(BaseToken $token, SplStack $values) |
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{ |
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if (isset($this->operator)) { |
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throw Exception\ParserException::unexpectedToken($token); |
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} elseif ($values->isEmpty()) { |
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throw Exception\ParserException::incompleteExpression($token); |
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} |
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$this->operator = $token; |
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} |
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private function evaluateExpression(SplStack $values, CompilerInterface $compiler) |
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{ |
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if (!isset($this->operator) || $values->count() !== 2) { |
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return; |
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} |
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list($rightValue, $leftValue) = $values; |
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try { |
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$expression = $this->expressionFactory->createFromOperator($this->operator); |
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$compiler->addBoolean( |
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$expression->evaluate($leftValue, $rightValue) |
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); |
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4 |
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} catch (MissingOperatorException $e) { |
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throw new Exception\ParserException('Missing operator'); |
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} |
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do { |
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$values->pop(); |
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} while (!$values->isEmpty()); |
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unset($this->operator); |
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} |
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} |
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nicoSWD /
php-rule-parser
