[Haskell-cafe] Language.Haskell.Parser question

[minh thu]

2009/3/26 Vasyl Pasternak <vasyl.pasternak at gmail.com>:
> Hi,
>
> I want to parse haskell file to find all calls to function 'foo' and
> gathers a create a list of all
> argumets, which passed to it. E.g. from the following code:
>
> f1 = foo 5
> f2 = foo 8
> f3 = foo 9
>
>  I want to extract a list [5, 8, 9] (suppouse function takes only one argument)
>
> The most obvious way is to use Language.Haskell for this task. The
> parser works pretty good,
> but its output data type is terrible. As I understand, I need to
> extract all objects that looks like
> HsApp (HsVar (UnQual (HsIdent "foo"))) ....
>
> The question is, is there a method to do it quickly or I have to
> process each object of different type
> separately ?

Have a look at this:
http://neilmitchell.blogspot.com/2009/03/concise-generic-queries.html

Cheers,
Thu