[Haskell-cafe] parsing exercise

[Alex Rozenshteyn]

You might want to check out parsec, and the chapter related to it in RWH.

http://book.realworldhaskell.org/read/using-parsec.html

On Sun, Jan 23, 2011 at 12:09 AM, Sebastian Fischer <fischer at nii.ac.jp>wrote:

> Hello,
>
> I need a function and wonder whether I can copy some existing code so I
> don't have to write it myself.
>
> It should split a string into a list of strings:
>
>     splitAtTopLevelCommas :: String -> [String]
>
> I need something similar to `splitOn ","` from the Text package with the
> property
>
>     intercalate "," . splitAtTopLevelCommas = id
>
> But it should split the string only on a few commas, not all. You can think
> of the result list as representations of Haskell values, for example
>
>     splitAtTopLevelCommas "True,(1,(2,[3,4])),Just ('a',\")\")"
>
> should yield
>
>     ["True", "(1,(2,[3,4]))", "Just ('a',\")\")"]
>
> I expect writing this function to be quite tedious (ignore commas in
> parens, ignore parens in strings, quotation, ...) and would prefer to copy
> code from some parsing library. Do you have an idea what I could use? Or how
> to solve it from scratch in a few lines?
>
> Sebastian
>
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>


-- 
          Alex R
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