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<?php |
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2
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3
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declare(strict_types=1); |
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5
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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\Rules; |
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use nicoSWD\Rules\Expressions\ExpressionFactory; |
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use nicoSWD\Rules\Tokens\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 ExpressionFactory */ |
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private $expressionFactory; |
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/** @var Compiler */ |
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private $compiler; |
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/** @var null|BaseToken */ |
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private $operator = null; |
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224 |
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public function __construct(AST $ast, ExpressionFactory $expressionFactory, Compiler $compiler) |
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{ |
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224 |
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$this->ast = $ast; |
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224 |
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$this->expressionFactory = $expressionFactory; |
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224 |
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$this->compiler = $compiler; |
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224 |
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} |
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220 |
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public function parse(string $rule): string |
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{ |
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220 |
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$values = new SplStack(); |
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220 |
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$this->compiler->clear(); |
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220 |
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$this->operator = null; |
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220 |
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foreach ($this->ast->getStream($rule) as $token) { |
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182 |
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switch ($token->getType()) { |
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182 |
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case TokenType::VALUE: |
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178 |
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$values->push($token->getValue()); |
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178 |
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break; |
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182 |
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case TokenType::LOGICAL: |
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36 |
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$this->compiler->addLogical($token); |
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continue 2; |
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182 |
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case TokenType::PARENTHESIS: |
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$this->compiler->addParentheses($token); |
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continue 2; |
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182 |
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case TokenType::OPERATOR: |
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178 |
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$this->assignOperator($token, $values); |
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176 |
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continue 2; |
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180 |
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case TokenType::COMMENT: |
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180 |
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case TokenType::SPACE: |
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178 |
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continue 2; |
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default: |
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throw Exceptions\ParserException::unknownToken($token); |
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} |
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64
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178 |
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$this->evaluateExpression($values); |
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} |
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160 |
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return $this->compiler->getCompiledRule(); |
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} |
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178 |
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private function assignOperator(BaseToken $token, SplStack $values) |
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{ |
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178 |
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if (isset($this->operator)) { |
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2 |
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throw Exceptions\ParserException::unexpectedToken($token); |
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178 |
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} elseif ($values->isEmpty()) { |
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2 |
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throw Exceptions\ParserException::incompleteExpression($token); |
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} |
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176 |
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$this->operator = $token; |
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176 |
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} |
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178 |
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private function evaluateExpression(SplStack $values) |
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{ |
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178 |
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if (!isset($this->operator) || $values->count() !== 2) { |
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178 |
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return; |
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} |
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174 |
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list ($rightValue, $leftValue) = $values; |
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try { |
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174 |
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$expression = $this->expressionFactory->createFromOperator($this->operator); |
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174 |
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$this->compiler->addBoolean( |
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174 |
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$expression->evaluate($leftValue, $rightValue) |
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); |
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4 |
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} catch (Exceptions\MissingOperatorException $e) { |
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2 |
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throw new Exceptions\ParserException('Missing operator'); |
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} |
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172 |
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while (!$values->isEmpty()) { |
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172 |
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$values->pop(); |
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} |
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172 |
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unset($this->operator); |
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172 |
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} |
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} |
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nicoSWD /
php-rule-parser
