[SOLVED] TextX retreiving object parent types

TextX retreiving object parent types

Assume that we have two rules like this in our grammar:

Value: AttributeReference | PrimitiveValue;
PrimitiveValue: BoolValue | StringValue | IntValue;

I want to implement a code generator for this language. Basically, for each rule, I defined a function that does that. For example, code_gen_value function gets an object and if the type of the object is AttributeReference then it will call code_gen_attribute_reference (passing the object), or if the type is PrimitiveValue, then it calls code_gen_primitive_value (passing the object). The issue is that I am using the following to retrieve the type of the object:

value_type = cname(value) where:

def cname(o):
     return o.__class__.__name__

However, when I run it on an example, the value_type is StringValue in code_gen_value function for the input object. My question is, how can I check for the object to be a subtype of the PrimitiveValue?

In XTexnd, one could use instanceof keyword and actually if obj instanceof PrimitiveValue would work in the code_gen_value. I am wondering how we can express that in TextX.

Is there a way to refer to the types in the metamodel generated for our grammar?

Thanks!

Solution

To check if object is an instance of some type according to the inheritance specified by the textX grammar you can use textx_isinstance. In the current release of textX (2.2.0) it can be imported from textx.scoping.tools. Starting from 2.3.0 it will be available in the textx module.