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