Parsing issues with functions

[Jelledb]

Hi,

First of all thanks for developing this library.

I am trying to use this library to read out Terraform in Java and get information about for example variable names & output names.

Maybe I do not understand the intention but I'm trying my code against many public examples of Terraform like https://github.com/futurice/terraform-examples and I notice it often crashes on function calls. One example is:

...
locals {
  cleansed_prefix = replace(var.name_prefix, "/[^a-zA-Z0-9]+/", "")
}
...

where it throws an error:

java.lang.ClassCastException: class com.bertramlabs.plugins.hcl4j.symbols.HCLAttribute cannot be cast to class java.lang.String (com.bertramlabs.plugins.hcl4j.symbols.HCLAttribute is in unnamed module of loader 'app'; java.lang.String is in module java.base of loader 'bootstrap')
	at com.bertramlabs.plugins.hcl4j.HCLBaseFunctions.lambda$registerBaseFunctions$13(HCLBaseFunctions.java:218)

I had a look at the code and it crashes on the replace function.

I have two questions basically:

• Why do you run those functions in general already at parsing time?
• Can I somehow turn off all functions? I just want to read out some basic details of the files like input, output, provider names. I don't need all these functions to be actually run.

[Jelledb]

I was able to fix the issue for now by overriding the HCLParser and de-registering all functions and data lookups:

public class MyHCLParser extends HCLParser {
    public MyHCLParser() {
        functionRegistry.clear();
        dataLookupRegistry.clear();
    }
}