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Adding Forth
I'd like to add Forth to Ohcount. I browsed the Detector and Parser html docs, briefly I admit, and I have some questions about how I might go.
On the detector side, there are two popular extensions: 4th and fs. There's no problem with the former, but fs
is also used by F#. I briefly considered ignoring it, but I checked OpenBios to see what extension it uses, and it is fs
.
So, how do I handle this conflict? The html docs doesn't even begin to cover this.
On the parser side, the problem consists in the fact that Forth doesn't really have a grammar. It's impossible to parse
it -- you have to run the code to make any sense out of it.
I can make an approximation for space, comments numbers and anything else, though it's guaranteed not to be accurate. What I can't do is make any parser that will identify Forth code as such, which brings me back to the .fs
extension, in a way.
So, in addition to helping me with the .fs
issue, any comments that might help?
Conflicts on filename extentions are pretty common. Ohcount has a whole battery of functions named disambiguate_* whose purpose is to guess which language is actually used inside a file.
In this case, I think the best strategy would be to quickly grep through the *.fs files and look for F# keywords. If you find multiple such keywords, it's likely that the file is F# and not Forth.
I think an approximate Forth line counter is better than no line counter at all. I think it's fine to begin with some reasonable attempt that gets it mostly
right.
