Pinq\Tests\Integration\Queries\QueryBuildingTestBase::parseQueryExpression PHP Метод

    protected function parseQueryExpression(callable $queryFunction, O\IEvaluationContext &$evaluationContext = null)
    {
        $reflection = $this->functionInterpreter->getReflection($queryFunction);
        $evaluationContext = $reflection->asEvaluationContext();
        $function = $this->functionInterpreter->getStructure($reflection);
        $expressions = $function->getBodyExpressions();
        $this->assertCount(1, $expressions);
        //Resolve the parameter variable with the queryable value and $this
        $parameterName = $reflection->getSignature()->getParameterExpressions()[0]->getName();
        $expression = $expressions[0];
        foreach ([$parameterName => $this->queryable, 'this' => $this] as $variable => $value) {
            $variableReplacer = new O\DynamicExpressionWalker([O\VariableExpression::getType() => function (O\VariableExpression $expression) use($variable, &$value) {
                if ($expression->getName() instanceof O\ValueExpression && $expression->getName()->getValue() === $variable) {
                    return O\Expression::value($value);
                } else {
                    return $expression;
                }
            }, O\ClosureExpression::getType() => function ($closure) {
                return $closure;
            }]);
            $expression = $variableReplacer->walk($expression);
        }
        if ($expression instanceof O\ReturnExpression) {
            return $expression->getValue();
        } else {
            return $expression;
        }
    }