Getting the literal value of a parameter to a sweet.js macro

Question

I've got a macro defined and I'm trying to test one of the values passed as a parameter to determine how to emit code. However, I keep getting errors thrown when I try to use the value. Here is a simple test that illustrates the problem:

let Test = macro {
    case {
        _ ($arg1,$arg2,$arg3)
    } => {
        if ($arg1 ==1) {
            return #{ 
                f($arg1,$arg2,$arg3)
            }
        } else {
            return #{
                g($arg1,$arg2,$arg3)
            }
        }
    }
}

Test(1,2,3)

The error I get is:

ReferenceError: $arg1 is not defined

I've taken various stabs by calling makeIdent, syntaxUnwrap, etc. without any luck. How can I test the value passed?

Update: After playing around with some things I discovered that I can use this construct to get the value:

#{$arg1}[0].token.value

But then I found this page which suggested that at one point token.value.raw was used instead of token.value, which further suggests that since I'm not going through the official documented API I may be accessing undocumented internals which are subject to change.

Getting the literal value of a parameter to a sweet.js macro

0 Answers0