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<?php |
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namespace RulerZ\Compiler; |
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use RulerZ\Executor\Executor; |
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use RulerZ\Parser\Parser; |
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class Compiler |
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{ |
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/** |
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* @var Parser |
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*/ |
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private $parser; |
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/** |
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* @var Evaluator |
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*/ |
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private $evaluator; |
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public static function create($cacheDirectory = null) |
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{ |
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return new static(new FileEvaluator($cacheDirectory)); |
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} |
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public function __construct(Evaluator $evaluator) |
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{ |
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$this->parser = new Parser(); |
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$this->evaluator = $evaluator; |
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} |
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/** |
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* @return Executor |
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*/ |
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public function compile($rule, CompilationTarget $target, Context $context) |
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{ |
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$context['rule_identifier'] = $this->getRuleIdentifier($target, $rule); |
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$context['executor_classname'] = 'Executor_' . $context['rule_identifier']; |
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$context['executor_fqcn'] = '\RulerZ\Compiled\Executor\\Executor_' . $context['rule_identifier']; |
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if (!class_exists($context['executor_fqcn'], false)) { |
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$compiler = function() use ($rule, $target, $context) { |
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return $this->compileToSource($rule, $target, $context); |
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}; |
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$this->evaluator->evaluate($context['rule_identifier'], $compiler); |
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} |
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return new $context['executor_fqcn'](); |
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} |
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protected function compileToSource($rule, CompilationTarget $compilationTarget, Context $context) |
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{ |
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$ast = $this->parser->parse($rule); |
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$executorModel = $compilationTarget->compile($ast, $context); |
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$flattenedTraits = implode(PHP_EOL, array_map(function($trait) { |
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return "\t" . 'use ' . $trait . ';'; |
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}, $executorModel->getTraits())); |
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$extraCode = ''; |
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foreach ($executorModel->getCompiledData() as $key => $value) { |
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$extraCode .= sprintf('private $%s = %s;' . PHP_EOL, $key, var_export($value, true)); |
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} |
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return <<<EXECUTOR |
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namespace RulerZ\Compiled\Executor; |
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use RulerZ\Executor\Executor; |
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class {$context['executor_classname']} implements Executor |
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{ |
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$flattenedTraits |
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$extraCode |
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// $rule |
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protected function execute(\$target, array \$operators, array \$parameters) |
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{ |
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return {$executorModel->getCompiledRule()}; |
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} |
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} |
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EXECUTOR; |
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} |
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protected function getRuleIdentifier(CompilationTarget $compilationTarget, $rule) |
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{ |
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return hash('crc32b', get_class($compilationTarget) . $rule); |
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} |
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} |
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K-Phoen /
rulerz
