* [Caml-list] lexer errors
@ 2012-06-23 1:14 Jacques Le Normand
2012-06-23 6:57 ` Mehdi Dogguy
0 siblings, 1 reply; 2+ messages in thread
From: Jacques Le Normand @ 2012-06-23 1:14 UTC (permalink / raw)
To: caml-list
How can I get some decent lexer error reporting?
Here's my program:
{
open Lexing
}
rule lex = parse
| "foo" {()}
| "\n" {lex lexbuf}
{
let main () =
let lexbuf = from_channel stdin in
try
let rec loop () =
let x = lex lexbuf in
loop x
in
loop ()
with
| _ ->
let x = lexbuf.Lexing.lex_curr_p in
Printf.printf
"line %d, character %d\n"
x.pos_lnum (x.pos_cnum - x.pos_bol)
let _ = main ()
}
running:
ocamlc -I ~/ocaml/ ~/ocaml/test_lexer2.ml -o ~/ocaml/test.o
echo foo > ~/temp.txt
echo bar >> ~/temp.txt
~/ocaml/test.o < ~/temp.txt
outputs the incorrect line:
line 1, character 4
(Should be line 2, character 1)
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2012-06-23 1:14 [Caml-list] lexer errors Jacques Le Normand
2012-06-23 6:57 ` Mehdi Dogguy
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