Haskell Platform Proposal: add the 'text' library

[Bryan O'Sullivan]

On Fri, Oct 8, 2010 at 8:00 AM, Ross Paterson <ross at soi.city.ac.uk> wrote:

>
> text        base      bytestring     type in text (or equivalent if absent)
> ---------------------------------------------------------------------------
> break       -         breakSubstring Text -> Text -> (Text, Text)
> breakBy     break     break          (Char -> Bool) -> Text -> (Text, Text)
> breakEnd    -         -              Text -> Text -> (Text, Text)
> -           -         breakEnd       (Char -> Bool) -> Text -> (Text, Text)
> count       -         -              Text -> Text -> Int
> -           -         count          Char -> Text -> Int
> find        -         -              Text -> Text -> [(Text, Text)]
> findBy      find      find           (Char -> Bool) -> Text -> Maybe Char
> partitionBy partition -              (Char -> Bool) -> Text -> (Text, Text)
> replicate   -         -              Int -> Text -> Text
> -           replicate replicate      Int -> Char -> Text
> spanBy      span      span           (Char -> Bool) -> Text -> (Text, Text)
> split       -         -              Text -> Text -> [Text]
> -           -         split          Char -> Text -> [Text]
> splitBy     -         splitWith      (Char -> Bool) -> Text -> [Text]
> unfoldrN    -         -              Int -> (a -> Maybe (Char, a)) -> a ->
> Text
> -           -         unfoldrN       Int -> (a -> Maybe (Char, a)) -> a ->
> (Text, Maybe a)
> zipWith     zipWith   -              (Char -> Char -> Char) -> Text -> Text
> -> Text
> -           zipWith   zipWith        (Char -> Char -> a) -> Text -> Text ->
> [a]
>
> * The -By suffix has been used for predicate versions in 5 cases here,
>  but not for filter and findIndex.
>

In the case of filter, that's because a filter function that didn't accept a
predicate wouldn't be useful. I added findIndex for completeness back when
that was the tack I was taking, but it arguably shouldn't be present at all,
since it's subsumed by find.

* The find function has no connection with findBy.  It ought to have a
>  name that is the plural of the name of the break function.


Again, this is present for completeness, and makes little obvious sense to
retain.
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