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|
(***********************************************************************)
(* *)
(* Objective Caml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1997 Institut National de Recherche en Informatique et *)
(* en Automatique. Distributed only by permission. *)
(* *)
(***********************************************************************)
(* $Id$ *)
(* An auxiliary lexer for determining the line number corresponding to
a file position, honoring the directives # linenum "filename" *)
{
let filename = ref ""
let linenum = ref 0
let linebeg = ref 0
let parse_sharp_line s =
try
(* Update the line number and file name *)
let l1 = ref 0 in
while let c = s.[!l1] in c < '0' || c > '9' do incr l1 done;
let l2 = ref (!l1 + 1) in
while let c = s.[!l2] in c >= '0' && c <= '9' do incr l2 done;
linenum := int_of_string(String.sub s !l1 (!l2 - !l1));
let f1 = ref (!l2 + 1) in
while !f1 < String.length s && s.[!f1] <> '"' do incr f1 done;
let f2 = ref (!f1 + 1) in
while !f2 < String.length s && s.[!f2] <> '"' do incr f2 done;
if !f1 < String.length s then
filename := String.sub s (!f1 + 1) (!f2 - !f1 - 1)
with Failure _ | Invalid_argument _ ->
Misc.fatal_error "Linenum.parse_sharp_line"
}
rule skip_line = parse
"#" [' ' '\t']* ['0'-'9']+ [' ' '\t']*
("\"" [^ '\n' '\r' '"' (* '"' *) ] * "\"")?
[^ '\n' '\r'] *
('\n' | '\r' | "\r\n")
{ parse_sharp_line(Lexing.lexeme lexbuf);
linebeg := Lexing.lexeme_start lexbuf;
Lexing.lexeme_end lexbuf }
| [^ '\n' '\r'] *
('\n' | '\r' | "\r\n")
{ incr linenum;
linebeg := Lexing.lexeme_start lexbuf;
Lexing.lexeme_end lexbuf }
| [^ '\n' '\r'] * eof
{ incr linenum;
linebeg := Lexing.lexeme_start lexbuf;
raise End_of_file }
{
let for_position file loc =
let ic = open_in_bin file in
let lb = Lexing.from_channel ic in
filename := file;
linenum := 1;
linebeg := 0;
begin try
while skip_line lb <= loc do () done
with End_of_file -> ()
end;
close_in ic;
(!filename, !linenum - 1, !linebeg)
}
|
