[mercury-users] Proposed change in lex interface

[Ondrej Bojar]

Hi, all.

I'd like to ask if there would be any severe objections against changing the 
interface to lex library as included in the mercury extras.

Some years ago I adapted a copy of lex so that the context returned would be 
not just byte offset but also the line number:

:- type context
     ==      {offset, lineno}.

and also changed the output type for the read predicate

:- pred read(io__read_result(Tok),
             lexer_state(Tok, Src), lexer_state(Tok, Src)).
:- mode read(out, di, uo) is det.

to

:- pred read(lexer_read_result(Tok), lexer_state(Tok, Src),
             lexer_state(Tok, Src)).
:- mode read(out, di, uo) is det.

where

:- type lexer_read_result(Token)
     --->    ok(Token, context)
     ;       error(string, context)
     ;       eof.

My version is now out of sync with the main one and I would like to use the 
same features for in the new version.

If you do not object, I'm going to change the interace in near future.

Thanks, Ondrej.

-- 
Ondrej Bojar (mailto:obo at cuni.cz / bojar at ufal.mff.cuni.cz)
http://www.cuni.cz/~obo
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