How to create scope for different ast nodes as members?

[durianwaffle]

Hi Langium community,

In my grammar, user can initialize input or output parameters in function calls
For example, func(input1:=1, output1=>bool).
Input parameter and output parameters are two types of AST nodes defined by our grammar.

I tried to use scope provider to resolve the alert msg Could not resolve reference to Parameter named 'input1' and Could not resolve reference to Parameter named 'output1'. But it doesn't work.

I printed out the output of function scopeFunctionBlockParameters, it contains the input and output parameters for function blocks. But the two alert msgs still exist.

export class xxScopeProvider extends DefaultScopeProvider {

    constructor(services: LangiumServices) {
        super(services);
    }

    protected override createScope(elements: Iterable<AstNodeDescription>, outerScope?: Scope, options?: ScopeOptions): Scope {
        const combinedOptions: ScopeOptions = {
            ...options,
            caseInsensitive: true
        };
        return new StreamScope(stream(elements), outerScope, combinedOptions);
    }

    override getGlobalScope(nodeType: string, _context: ReferenceInfo): Scope {
        return this.newCaseInsensitiveScope(this.indexManager.allElements(nodeType));
    }
    override getScope(context: ReferenceInfo): Scope {
      const memberCall = context.container as MemberCall;
      let receiver = memberCall.receiver as MemberCall;
      const featureCall = memberCall.$container.$container;
      if (isFeatureCall(featureCall)) {
          const varDeclare = featureCall?.element?.ref as VariableDeclaration;
          if (isTypeReference(varDeclare.type)) {
              const fbDeclare = varDeclare.type?.reference?.ref;
              if (isFunctionBlockDeclaration(fbDeclare)) {
                  return this.scopeFunctionBlockParameters(fbDeclare as FunctionBlockDeclaration);
              }
          };
      }
}

private scopeFunctionBlockParameters(structItem: FunctionBlockDeclaration): Scope {
    return this.createScopeForNodes([...structItem.outputs, ...structItem.parameters], undefined, { caseInsensitive: true });
}

[cdietrich]

i propose you debug DefaultLinker.getLinkedNode and StreamScope.getElement

[durianwaffle]

Thanks! Is there example to do it? I am still a little puzzled

[cdietrich]

if you run the extension there is an attach to language server in the launch configs.
i ususally write a unit test and debug that one