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kotlinlang

I wonder if I could use the compiler to process code and:
• find calls to a certain function
• infer types
My use case is this, I need to find calls like this:
```        registerNodeFactory(Ref_pathContext::class) { pt: Ref_pathContext, t: ASTTransformer -&gt;
            var ast: PSSExpression
            ...
        }```
And to infer the return type of the lambda.
I would then use that information to generate some code.

Would that be feasible?

Could I use the compiler as a library for this, or should I create a compiler plugin?

Yes, it is quite possible. An example below which does almost what you want. It finds calls to functions annotated with a specific annotation. Then transforms those calls. I use a cache to decide if the function called is annotated to speed thing up a bit.

<https://github.com/spxbhuhb/z2-schematic/blob/2276929941f1b87f8070e1c3e6e7d346470bc872/z2-schematic-kotlin-plugin/src/hu/simplexion/z2/schematic/kotlin/ir/access/SchematicAccessTransform.kt|https://github.com/spxbhuhb/z2-schematic/blob/2276929941f1b87f8070e1c3e6e7d346470b[…]exion/z2/schematic/kotlin/ir/access/SchematicAccessTransform.kt>

I think you need to write a plugin for that.