Making Macros in CoffeeScript

http://blog.lab49.com/archives/5111

by unignorant • 15 years ago

42 7 15 years ago

blog.lab49.com

rimantas• 15 years ago

Swap was not the best choice to be used as example, imho. CoffeScript has deconstructing assignments so to swap two variables you just do [x, y] = [y, x].

danking00• 15 years ago

I saw parsec-coffee-script a while back and really wanted to help, but I was quite busy. I'd love to see hygenic macros in coffee-script... Unfortunately, it looks like parsec hasn't been committed to since February. Anyone know what the status of that project is?

boucher• 15 years ago

Pretty cool. We've been using macros in the Cappuccino source code for years, but we were too lazy to write our own macro processor so we just use the GCC preprocessor. Relying on GCC being available turns out to work pretty well.

__rkaup__• 15 years ago

Didn't know the GCC preprocessor was language agnostic. Never thought about it really.

saurik• 15 years ago

You actually can/will run into problems if the language you are pre-processing with CPP tokenizes differently than C.

yason• 15 years ago

Isn't this just lexical macros?

I expected a HN headline to refer at least to a novel Lisp style AST macro implementation; there's m4 and cpp for basic textual macro expansion and those are very old news.

davidpadbury• 15 years ago

It's actually working on the CoffeeScript AST. Admittedly the example I used doesn't demonstrate this particularly well.

Making Macros in CoffeeScript

Related Stories