[Haskell-cafe] Parse text difficulty
ketil+haskell at ii.uib.no
Thu Dec 9 05:03:38 EST 2004
Douglas Bromley <doug.bromley at gmail.com> writes:
> I've show(n) a particular data type and it shows up as:
Let me guess: type [([Integer],String)]?
> What I want to do is format that nicely into a table.
Since you (probably) want one list entry on a line, why not
format each entry as a string, and output each string as a line? You
may find the function "unlines" to be helpful.
> The best way of doing (I thought) was to:
> Remove the first "[(" and final ")]"
> Then replace "),(" with a newline(\n)
If you really want to do this (reformat the string), you could perhaps
write a function that substitutes a substring for something else,
perhaps using "isPrefixOf", "drop" and "take". But this will be a
more fragile design than working from the original data strucure.
If I haven't seen further, it is by standing in the footprints of giants
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