protected function resolveParentVariable(Expressions\GetAttribute $expr)
{
$depth = 0;
while ($expr instanceof Expressions\GetAttribute && $expr->getAttributeName() === '_parent') {
$depth++;
$expr = $expr->getExpression();
}
if (!$expr instanceof Expressions\Variable || $expr->getVariableName() !== '_parent') {
throw new \InvalidArgumentException("You cannot do a `_parent` dereference on anything but `_parent`!");
}
$depth++;
return $depth;
}
/**
* This method reduces a (recursive) GetAttribute expression to a TemplateFunctions::fetchProperty() MethodCall expression
* @param Expressions\GetAttribute $expr
* @return Expressions\MethodCall
*/
protected function convertGetAttributeToFetchPropertyCall(Expressions\GetAttribute $expr)
{
$baseExpr = $expr->getExpression();
if ($baseExpr instanceof Expressions\Variable && !in_array($baseExpr->getVariableName(), ['_parent', '_top', '_'])) {
// make sure we use fetchProperty() to dereference the variable, instead of doing a normal array dereference
$properties = [new Expressions\Variable('_'), new Expressions\Scalar($baseExpr->getVariableName())];
} else {
$properties = [$baseExpr];
}
while ($expr instanceof Expressions\GetAttribute) {
// don't pass the "magic" attributes to fetchProperty()
if (in_array($expr->getAttributeName(), ['_parent', '_top'])) {
$properties[] = $expr;
$expr = $expr->getExpression();
continue;
}
$properties[] = new Expressions\Scalar($expr->getAttributeName());
$expr = $expr->getExpression();
}
return new Expressions\MethodCall('\\Plitz\\Bindings\\Blitz\\TemplateFunctions::fetchProperty', $properties);
}