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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 Closure; |
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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 nicoSWD\Rule\TokenStream\Token\TokenType; |
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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 BaseToken|null */ |
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private $operator; |
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/** @var SplStack */ |
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private $values; |
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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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public function parse(string $rule): string |
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{ |
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$compiler = $this->compilerFactory->create(); |
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$this->operator = null; |
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$this->values = new SplStack(); |
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foreach ($this->ast->getStream($rule) as $token) { |
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$handler = $this->getTokenHandler($token); |
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$handler($compiler); |
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} |
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return $compiler->getCompiledRule(); |
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} |
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private function getTokenHandler(BaseToken $token): Closure |
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{ |
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return function (CompilerInterface $compiler) use ($token) { |
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$handlers = [ |
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TokenType::VALUE => $this->handleValueToken(), |
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186 |
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TokenType::INT_VALUE => $this->handleValueToken(), |
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TokenType::OPERATOR => $this->handleOperatorToken(), |
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TokenType::LOGICAL => $this->handleLogicalToken(), |
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TokenType::PARENTHESIS => $this->handleParenthesisToken(), |
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TokenType::SPACE => $this->handleDummyToken(), |
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TokenType::COMMENT => $this->handleDummyToken(), |
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TokenType::UNKNOWN => $this->handleUnknownToken(), |
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]; |
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$handler = $handlers[$token->getType()] ?? $handlers[TokenType::UNKNOWN]; |
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$handler($token, $compiler); |
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$this->evaluateExpression($compiler); |
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}; |
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} |
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private function evaluateExpression(CompilerInterface $compiler) |
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{ |
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if (!isset($this->operator) || $this->values->count() !== 2) { |
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return; |
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} |
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list($rightValue, $leftValue) = $this->values; |
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try { |
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$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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} catch (MissingOperatorException $e) { |
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throw new Exception\ParserException('Missing operator'); |
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} |
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do { |
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$this->values->pop(); |
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} while (!$this->values->isEmpty()); |
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unset($this->operator); |
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} |
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private function handleValueToken(): Closure |
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{ |
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return function (BaseToken $token) { |
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$this->values->push($token->getValue()); |
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}; |
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} |
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private function handleOperatorToken(): Closure |
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{ |
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return function (BaseToken $token) { |
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if (isset($this->operator)) { |
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throw Exception\ParserException::unexpectedToken($token); |
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} elseif ($this->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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} |
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private function handleLogicalToken(): Closure |
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{ |
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return function (BaseToken $token, CompilerInterface $compiler) { |
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$compiler->addLogical($token); |
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}; |
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} |
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private function handleParenthesisToken(): Closure |
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{ |
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return function (BaseToken $token, CompilerInterface $compiler) { |
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$compiler->addParentheses($token); |
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}; |
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} |
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private function handleUnknownToken(): Closure |
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{ |
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return function (BaseToken $token) { |
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throw Exception\ParserException::unknownToken($token); |
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}; |
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} |
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private function handleDummyToken(): Closure |
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{ |
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return function () { |
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// Do nothing |
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}; |
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} |
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} |
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nicoSWD /
php-rule-parser
