Reason: ES6-like string interpolation

[glennsl]

This is related to #899 but should be much more straightforward to implement.

Essentially a syntax translation from something like:

"Fifteen is ${a + b} and not ${2 * a + b}."

to

"Fifteen is " ^ (a + b) ^ " and not " ^ (2 * a + b) ^ "."

[glennsl]

This also seems like a good first issue for one to dip ones toes into contributing. If someone could give me some pointers I'd be happy to give it a shot.

[hcarty]

I have something started as a ppx. I still need to clean the code up enough to release but it may help as a starting point if you're interested. The target is currently format strings ("%s"/"%a"-style) but anything else could be used as a target.

[SanderSpies]

Related: https://github.com/facebook/reason/pull/366. Note the PRs to free
` are still open.

On Feb 6, 2017 20:26, "Hezekiah M. Carty" [e-mail] wrote:

I have something started as a ppx. I still need to clean the code up
enough to release but it may help as a starting point if you're interested.
The target is currently format strings ("%s"/"%a"-style) but anything
else could be used as a target.

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[glennsl]

Wait, so there already is syntax for string interpolation with {|foo|}? How do you embed an expression in it?

[vramana]

If you are looking for an example, here is one. https://github.com/reasonml/rebel/blob/master/src/merlin.re#L93

[hcarty]

@glennsl There is no interpolation in {|foo|} - that form is meant to allow unescaped content within a literal.

[glennsl]

@hcarty %s would do fine. I had that exact same idea. It doesn't matter much to me what the exact syntax is, so if {| |} will do the trick too, that's fine by me. Otherwise I'd be happy to take a look at the ppx you've started on.

[glennsl]

@hcarty ah, that's more commonly termed a raw string literal I think.

[hcarty]

http://caml.inria.fr/pub/docs/manual-ocaml/extn.html#sec250 - "quoted strings" in the OCaml manual. And yes it looks like raw string literal is used in at least a few other languages as the name for equivalent features.

[glennsl]

BuckleScript now has a simple form of string interpolation: https://bloomberg.github.io/bucklescript/Manual.html#_unicode_support_with_string_interpolation_since_1_7_0

Some sugar would still be pretty _sweet_ though!