[m-dev.] proposal: tracking column numbers in text streams

[Paul Bone]

On Fri, Nov 01, 2013 at 03:08:21PM +1100, Julien Fischer wrote:
>
> Hi,
>
> I propose that we change io.text_input_streams so that in addition to
> keeping track of the line numbers, they also keep track of the column
> number.  Amongst other things this would allow us to associate column
> numbers with compiler error messages (after suitably modifying the term
> parser).
>
> We can always add "fast" versions of the various I/O operations that do
> not maintain the column number count, if the overhead involved is
> excessive.  (Assuming there is in-principle support for this, I'll
> measure the performance impact before committing anything anyway.)
>

Sounds resonable.


-- 
Paul Bone
http://www.bone.id.au