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In-Reply-To: <73F2C118-89C0-4EFB-849D-1F70B4B58AA4@math.harvard.edu>
References: <73F2C118-89C0-4EFB-849D-1F70B4B58AA4@math.harvard.edu>
From: Gabriel Scherer <gabriel.scherer@gmail.com>
Date: Sun, 8 Jul 2012 12:18:30 +0200
Message-ID: <CAPFanBEwHQ6znL=3atL0JO36aDXtOtKMj5T7a7JV-sQw0o+Kww@mail.gmail.com>
To: Nicolas Ojeda Bar <nojb@math.harvard.edu>
Cc: caml-list@yquem.inria.fr
Content-Type: text/plain; charset=ISO-8859-1
Subject: Re: [Caml-list] stream parsers with location information?

Indeed: you need your lexer to produce location information. Instead
of manipulating a (token Stream.t), you will produce (and then parse
at the lexer level) a ((token * location) Stream.t).

This is the way Camlp4 parsers are implemented (recursive descent over
a stream of tokens and positions). See also "Planck", an experiment at
combinator parser libraries by Jun Furuse, using a similar (but
different) architecture.
  http://bluestorm.info/camlp4/camlp4-doc/Sig.Lexer.html
  https://bitbucket.org/camlspotter/planck/
  http://camlspotter.blogspot.fr/2011/05/planck-small-parser-combinator-library.html


On Sun, Jul 8, 2012 at 12:01 PM, Nicolas Ojeda Bar
<nojb@math.harvard.edu> wrote:
> Hi,
>
> Is there a clean way to use stream parsers/lexers if I want to have
> location (line number, character position) information attached to
> each token?
>
> Thanks!
> Nicolas
>
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