Add support for the use of "debugger;" in FFI

[bitemyapp]

Currently get: unexpected reserved word "debugger" for an otherwise valid lambda :(

[bergmark]

Thanks for the reminder! This is a restriction in language-ecmascript, i have been meaning to ask them if it's possible to allow it. I'll open an issue in their repo.

[bergmark]

For now, you can do

function f(%1) { debugger; ... }

foo :: X
foo = ffi "f(%1)"

[bitemyapp]

@bergmark this sounds very helpful but I'm a little confused as to what is meant here. It wasn't clear to me that I could inline JavaScript functions without being inside an ffi string into Fay code. Is that what your example is illustrating?

[bergmark]

Forgot to reply to this, sorry!

No it's not valid to inline JS outside the FFI, I meant that you can have a normal JS function that's included which calls debugger. For instance

Debug.js:

function debug(f) { debugger; return f(); }

FayProgram.hs:

foo :: Int -> Int
foo = ffi "debug(function () { return %1; })"

Usually I just add break points in the browser or modify the produced js instead of doing this.

[dead-claudia]

Would it be possible to do something like this? I don't have a lot of experience with Fay (or Haskell, for that matter).

debugBreak :: a -> a
debugBreak = ffi "(function(a){debugger;return a})(%1)"

[bergmark]

@IMPinball We parse the ffi string as a javascript expression using the language-ecmascript package and it doesn't allow debugger at all.

IIRC this will be supported in language-ecmascript-1.0 but I'm not sure when that will be released.

[dead-claudia]

Oh. It seems odd that it's not even supported.