[Haskell-cafe] simple parsec question

[S. Doaitse Swierstra]

Maybe this is something you do not even want to use a parser combinator library for. The package

http://hackage.haskell.org/packages/archive/list-grouping/0.1.1/doc/html/Data-List-Grouping.html

contains a function breakBefore, so you can write

main = do inp <- readFile ...
                 let result = map mkSection . breakBefore ((= ':').last)). lines $ inp

mkSection (l:ll) = Section (Top l) (Contents ll)

Doaitse


On Mar 3, 2013, at 16:44 , Immanuel Normann <immanuel.normann at googlemail.com> wrote:

> Hi,
> 
> I am trying to parse a semi structured text with parsec that basically should identify sections. Each section starts with a headline and has an unstructured content - that's all. For instance, consider the following example text (inside the dashed lines):
> 
> ---------------------------
> 
> top 1:
> 
> some text ... bla
> 
> top 2:
> 
> more text ... bla bla
> 
> 
> ---------------------------
> 
> This should be parsed into a structure like this:
> 
> [Section (Top 1) (Content "some text ... bla"), Section (Top 1) (Content "more text ... bla")]
> 
> Say, I have a parser "headline", but the content after a headline could be anything that is different from what "headline" parses.
> How could the "section" parser making use of "headline" look like?
> My idea would be to use the "manyTill" combinator, but I don"t find an easy solution.
> 
> Many thanks for any hint
> 
> Immanuel
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