Antoine, Thank you very much for your reply. Adding type sigs did help me think about it. I got it to work. I replaced:
eol = char '\n' textLines = endBy eol
with:
textLine :: Parser String textLine = do x <- many (noneOf "\n") char '\n' return x
textLines :: Parser [String] textLines = many textLine
And it can probably be coded more succinctly that that (suggestions welcome).
I wanted to use Parsec because I want to learn it, and just wanted to
start with something very simple.
Thanks again!
-- Peter
On Tue, Sep 14, 2010 at 7:48 PM, Antoine Latter
Hi Peter,
...
What do you expect the type of 'textLines' to be? Does the error change if you add a type annotation to 'textLines'?
Adding more type signatures is my usual first step in understanding bewildering error messages.
In this case, I think the issue is that the 'emdBy' function from Parsec expect two arguments[1], and you have only give it one. You've written the 'separator' parser, but you also need to specify what to parse between the separators.
If this is as complex as the task is, you may be better off with the function Prelude.lines[2] :-)
Take care, Antoine
[1] http://hackage.haskell.org/packages/archive/parsec/3.1.0/doc/html/Text-Parse...
[2] http://haskell.org/ghc/docs/6.12.1/html/libraries/base-4.2.0.0/Prelude.html#...