Haskell Platform Proposal: add the 'text' library

Ian Lynagh igloo at earth.li
Fri Sep 10 16:10:14 EDT 2010

On Thu, Sep 09, 2010 at 11:36:30AM -0700, Bryan O'Sullivan wrote:
> On Wed, Sep 8, 2010 at 5:21 PM, wren ng thornton <wren at community.haskell.org
> > wrote:
> >
> >> Text: break :: Text ->  Text ->  (Text, Text)
> >>       breakBy :: (Char ->  Bool) ->  Text ->  (Text, Text)
> > Other than that, I do agree with the philosophy of the "deliberate and
> > sensible" differences. Though, given the philosophy that these aren't
> > Char-wise operations, why does Text.breakBy accept a (Char->Bool)? Is this
> > just an optimization for common cases like breaking on Unicode-defined
> > whitespace codepoints?
> I kept breakBy in there because it is actually useful. I changed its name
> because it's by far less common than "I want to break on a string".

That makes sense if considering text in isolation, but as part of a
system I would prefer consistent names between []/String, bytestring and
text. (It shouldn't necessarily be text that changes, though).

I also wonder if there should be a
    f :: (Text -> Bool) -> Text -> (Text, Text)
where e.g. the current break is (\t -> f (t `isPrefixOf`)).


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