[wg-camlp4] nested quotation lexing problem?

Bob Zhang bobzhang1988 at gmail.com
Sat May 11 16:08:50 BST 2013


On Sat, May 11, 2013 at 10:42 AM, Wojciech Meyer
<wojciech.meyer at gmail.com>wrote:

> Hi,
> I'd make it following OCaml convention, but also make it plugable so the
> user can choose how to lex the contents, because string can contain
> arbitrary text, and I've never seen a computer language that had
> different delimiters (apart from Python ''') so it all makes sense. On
> other hand allowing strings between other delimiters would be good to.
> Yes, I think the requirement  for the string convention is reasonable, but
the requirement for char convention is a bit loose. So,
   {:q| "|}" |} (* accepted*)
   {:q| '"' |}  (* accepted *)
   {:q| '     '  |} (* accepted as well, the char check is intended to be
loose *)

Now even the lexer generator is embedded in Fan and bootstrapped by Fan
check out :

The advantaged compared with ocamllex is that it works in toplevel :-)

> Now it's time to say, you would love how the PEG packrat parses, because
> it does not have lexing pass so you would not have this problem. (but
> has some slightly different).
> Wojciech

-- Bob
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