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<?php |
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namespace Pinq\Expressions; |
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/** |
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* Implementation of the expression evaluator using compiled closures. |
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* |
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* @author Elliot Levin <[email protected]> |
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*/ |
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class CompiledEvaluator extends Evaluator implements \Serializable |
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{ |
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const CONTEXT_PARAMETER_NAME = '__CONTEXT__'; |
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/** |
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* @var string |
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*/ |
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protected $code; |
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/** |
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* @var \Closure |
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*/ |
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protected $originalCompiledEvaluator; |
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/** |
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* @var \Closure |
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*/ |
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protected $boundCompiledEvaluator; |
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/** |
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* @var mixed[] |
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*/ |
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protected $extraVariables = []; |
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/** |
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* Creates a new compiled evaluator from the supplied expressions. |
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* |
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* @param Expression[] $expressions |
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* @param IEvaluationContext $context |
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* |
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* @return CompiledEvaluator |
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*/ |
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public static function fromExpressions(array $expressions, IEvaluationContext $context = null) |
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{ |
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$evaluator = new self($context); |
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$namespace = $evaluator->context->getNamespace(); |
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$contextParameterName = self::CONTEXT_PARAMETER_NAME; |
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$variableTable = $evaluator->context->getVariableTable(); |
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//Replace any non value types with references in the variable table. |
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$expressions = (new DynamicExpressionWalker([ |
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ValueExpression::getType() => |
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function (ValueExpression $expression) use ($evaluator, $variableTable, &$name) { |
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$value = $expression->getValue(); |
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if (!ValueExpression::isValueType($value)) { |
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$name = $name !== null ? $name : 0; |
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do { |
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$name++; |
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} while (isset($variableTable['o' . $name])); |
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$name = 'o' . $name; |
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$evaluator->extraVariables[$name] = $value; |
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return Expression::variable(Expression::value($name)); |
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} |
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return $expression; |
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} |
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]))->walkAll($expressions); |
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$bodyCode = ''; |
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foreach ($evaluator->extraVariables + $variableTable as $variable => $value) { |
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$variableName = Expression::value($variable); |
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$variableCode = Expression::variable($variableName)->compile(); |
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$bodyCode .= "$variableCode =& $$contextParameterName" . '[' . $variableName->compile() . '];'; |
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} |
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$bodyCode .= "unset($$contextParameterName);"; |
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$bodyCode .= implode(';', Expression::compileAll($expressions)) . ';'; |
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$evaluator->code = <<<PHP |
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namespace {$namespace} { |
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return function ($$contextParameterName) { |
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$bodyCode |
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}; |
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} |
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PHP; |
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$evaluator->initializeEvaluator(); |
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return $evaluator; |
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} |
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public function serialize() |
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{ |
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return serialize([$this->code, $this->context, $this->requiredVariables, $this->extraVariables]); |
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} |
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public function unserialize($serialized) |
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{ |
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list($this->code, $this->context, $this->requiredVariables, $this->extraVariables) = unserialize($serialized); |
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$this->initializeEvaluator(); |
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} |
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private function initializeEvaluator() |
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{ |
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$this->originalCompiledEvaluator = self::evalCode($this->code); |
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$this->boundCompiledEvaluator = $this->originalCompiledEvaluator->bindTo( |
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$this->context->getThis(), |
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$this->context->getScopeType() |
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); |
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} |
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private static function evalCode(string $code): \Closure |
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{ |
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return eval($code); |
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} |
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/** |
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* @return string |
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*/ |
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public function getCode() |
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{ |
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return $this->code; |
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} |
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protected function doEvaluation(array $variableTable) |
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{ |
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$evaluator = $this->boundCompiledEvaluator; |
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return $evaluator($variableTable + $this->extraVariables); |
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} |
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protected function doEvaluationWithNewThis(array $variableTable, $newThis) |
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{ |
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$evaluator = $this->originalCompiledEvaluator->bindTo($newThis, $this->context->getScopeType()); |
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return $evaluator($variableTable + $this->extraVariables); |
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} |
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} |
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TimeToogo /
Pinq
