Pinq\Expressions\DynamicExpressionWalker::doWalk PHP Method

    protected function doWalk(Expression $expression)
    {
        $expressionType = get_class($expression);
        do {
            if (isset($this->callableMap[$expressionType])) {
                return $this->callableMap[$expressionType]($expression, $this);
            }
        } while (($expressionType = get_parent_class($expressionType)) !== false && $expressionType !== Expression::EXPRESSION_TYPE);
        return $expression->traverse($this);
    }