Not that I really want to encourage such a "stringly typed" practice, but it wouldn't really be that much of a stretch. * Use haskell-src-exts[0] and haskell-src-meta[1] to make a quasiquoter that can parse Haskell syntax * Use syb[2] or some other generics to find VarE and ConE expressions. In order to use SYB with TH, you'll want th-orphans[3] * Use 'reify'[4] on the name of the variable or constructor, to see if it exists. If it doesn't[5], replace it with (LitE (StringL (nameBase name))) Shouldn't really be much code at all! :D -Michael [0] http://hackage.haskell.org/package/haskell-src-exts [1] http://hackage.haskell.org/package/haskell-src-meta [2] http://hackage.haskell.org/package/syb [3] http://hackage.haskell.org/package/th-orphans [4] http://hackage.haskell.org/packages/archive/template-haskell/latest/doc/html... [5] http://byorgey.wordpress.com/2011/08/16/idempotent-template-haskell/ On Sat, Aug 31, 2013 at 11:41 PM, Mateusz Kowalczyk <fuuzetsu@fuuzetsu.co.uk
wrote:
On 01/09/13 07:02, yi lu wrote:
I want to know if it is possible that I use strings without "".
If I type *Prelude>foo bar* which actually I mean *Prelude>foo "bar"* However I don't want to type ""s.
I have noticed if *bar* is predefined or it is a number, it can be used as arguments. But can other strings be used this way? Like in bash, we can use *ping 127.0.0.1* where *127.0.0.1* is an argument.
If not, can *foo* be defined as a function so that it recognize arguments like *bar* as *"bar"*?
Thanks, Yi Lu
You can't do this non-trivially. I think your only bet would be Template Haskell using the second approach and even then, it's a huge, huge stretch. I highly recommend against such ideas though. Do you really want anything that's not bound to be treated as a String? (The answer is ‘no’). I suggest that you get used to ‘"’s.
If you have deep hatred for ‘"’, you could resort to spelling out the strings like ['f', 'o', 'o'] or even 'f':'o':'o':[].
It's a bit like asking whether you can do addition everywhere by just typing the numbers to each other (no cheating and defining number literals as functions ;) ).
-- Mateusz K.
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