* [Caml-list] Notion of lexer state in ocamllex?
@ 2003-08-29 20:44 David Van Horn
2003-08-30 9:22 ` Michal Moskal
0 siblings, 1 reply; 2+ messages in thread
From: David Van Horn @ 2003-08-29 20:44 UTC (permalink / raw)
To: caml-list
I'm new to ocamllex and I am trying to translate a lexer written using CUP
(for Java), but I don't understand how parser state is accomplished in
ocamllex. For example, I have:
<YYINITIAL>"/*" { yybegin(INCOMMENT); }
<INCOMMENT>"*/" { yybegin(YYINITIAL); }
<INCOMMENT>[^\*]+ { }
Any ideas how to do this in ocamllex? Thanks.
-d
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^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [Caml-list] Notion of lexer state in ocamllex?
2003-08-29 20:44 [Caml-list] Notion of lexer state in ocamllex? David Van Horn
@ 2003-08-30 9:22 ` Michal Moskal
0 siblings, 0 replies; 2+ messages in thread
From: Michal Moskal @ 2003-08-30 9:22 UTC (permalink / raw)
To: David Van Horn; +Cc: caml-list
On Fri, Aug 29, 2003 at 03:44:06PM -0500, David Van Horn wrote:
> I'm new to ocamllex and I am trying to translate a lexer written using CUP
> (for Java), but I don't understand how parser state is accomplished in
> ocamllex. For example, I have:
>
> <YYINITIAL>"/*" { yybegin(INCOMMENT); }
> <INCOMMENT>"*/" { yybegin(YYINITIAL); }
> <INCOMMENT>[^\*]+ { }
>
> Any ideas how to do this in ocamllex? Thanks.
rule token = parse
...
| "/*" { comment lexbuf; token lexbuf }
...
and comment = parse
"*/" { () }
_ { comment lexbuf }
Or something like this.
--
: Michal Moskal :: http://www.kernel.pl/~malekith : GCS {C,UL}++++$ a? !tv
: When in doubt, use brute force. -- Ken Thompson : {E-,w}-- {b++,e}>+++ h
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