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; } }