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Message from discussion How to disambiguate infix operators?
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Dirk Ullrich  
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 More options Aug 10 2012, 6:14 pm
From: Dirk Ullrich <dirk.ullr...@gmail.com>
Date: Sat, 11 Aug 2012 00:14:48 +0200
Local: Fri, Aug 10 2012 6:14 pm
Subject: Re: [Idris] How to disambiguate infix operators?
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Hi,

2012/8/8 Dirk Ullrich <dirk.ullr...@gmail.com>:

> Hello,

> 2012/8/7 Edwin Brady <edwin.br...@gmail.com>:
>> On 7 Aug 2012, at 13:18, Dirk Ullrich wrote:

>>> Before trying my hand to fix this I have a question:
>>> @Edwin: Would you consider `ns.(~)' or `(ns.~)' the correct syntax for
>>> using an infix operator `~' together with an namespace `ns' in
>>> ordinary function (i.e. prefix) position?

>> I would think ns.(~) is the most natural prefic syntax for this - I'm not sure there is a natural infix syntax. But to be honest, I don't really mind, because they both seem to make sense.

>> It should be that all that needs changing is the pfName function in Idris/Parser.hs. It may also be worth looking at Core/CoreParser.hs (which implements a basic parser for the core language, some of which is inherited by the main parser).
> I've tried to add enhance `pfName' to support operators in front
> position with a namespace in the form `ns.(~)', too. The new `pfName'
> seems okay when using in an sandboxed test environment. But it does
> not work with Idris - it isn't even backwards compatible. In the patch
> attached the line where the new `pfName' fails even when checking
> Idris' libraries is marked by a `--FixMe'.

[...]

I hope I've got it now. The patch appended can be applied to Git
master, and should make Idris to support operators with namespaces in
front position in the form of `ns.(~)'. (My failure with the patch
before was not to check that the namespace prefix ends in a `.' This
merged the type declaration of an operator with its first pattern
declaration.)

Next I would try to add support for infix oparators with namespaces in
infix position, i.e. something like `x ns.~ y'. Looking forward to
such funny things like distinguishing `ns..' - operator `.' with
namespace `ns' - from an identifier  ...

Dirk

  ns_op_front.diff
4K Download

 
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