[Haskell-cafe] simple parsec question

[Andrey Chudnov]

Immanuel,
Since a heading always starts with a new line (and ends with a colon 
followed by a carriage return or just a colon?), I think it might be 
useful to first separate the input into lines and then classify them 
depending on whether it's a heading or not and reassemble them into the 
value you need. You don't even need parsec for that.

However, if you really want to use parsec, you can write something like 
(warning, not tested):
many $ liftM2 Section headline content
    where headline = anyChar `manyTill` (char ':' >> spaces >> newline)
                content  = anyChar `manyTill` (try $ newline >> headline)

/Andrey

On 3/3/2013 10:44 AM, Immanuel Normann wrote:
> 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.