103 lines
3.3 KiB
OCaml
103 lines
3.3 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 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the Q Public License version 1.0. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(* The lexer generator. Command-line parsing. *)
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open Syntax
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open Lexgen
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let ml_automata = ref false
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let source_name = ref None
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let output_name = ref None
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let usage = "usage: ocamlex [options] sourcefile"
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let specs =
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["-ml", Arg.Set ml_automata,
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" Output code that does not use the Lexing module built-in automata interpreter";
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"-o", Arg.String (fun x -> output_name := Some x),
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" <file> Set output file name to <file>";
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"-q", Arg.Set Common.quiet_mode, " Do not display informational messages";
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]
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let _ =
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Arg.parse
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specs
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(fun name -> source_name := Some name)
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usage
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let main () =
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let source_name = match !source_name with
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| None -> Arg.usage specs usage ; exit 2
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| Some name -> name in
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let dest_name = match !output_name with
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| Some name -> name
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| None ->
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if Filename.check_suffix source_name ".mll" then
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Filename.chop_suffix source_name ".mll" ^ ".ml"
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else
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source_name ^ ".ml" in
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let ic = open_in_bin source_name in
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let oc = open_out dest_name in
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let tr = Common.open_tracker dest_name oc in
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let lexbuf = Lexing.from_channel ic in
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try
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let def = Parser.lexer_definition Lexer.main lexbuf in
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let (entries, transitions) = Lexgen.make_dfa def.entrypoints in
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if !ml_automata then begin
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Outputbis.output_lexdef
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source_name ic oc tr
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def.header entries transitions def.trailer
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end else begin
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let tables = Compact.compact_tables transitions in
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Output.output_lexdef source_name ic oc tr
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def.header tables entries def.trailer
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end;
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close_in ic;
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close_out oc;
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Common.close_tracker tr;
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with exn ->
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close_in ic;
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close_out oc;
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Common.close_tracker tr;
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Sys.remove dest_name;
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begin match exn with
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Parsing.Parse_error ->
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Printf.fprintf stderr
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"File \"%s\", line %d, character %d: syntax error.\n"
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source_name !Lexer.line_num
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(Lexing.lexeme_start lexbuf - !Lexer.line_start_pos)
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| Lexer.Lexical_error(msg, line, col) ->
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Printf.fprintf stderr
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"File \"%s\", line %d, character %d: %s.\n"
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source_name line col msg
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| Lexgen.Memory_overflow ->
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Printf.fprintf stderr
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"File \"%s\":\n Position memory overflow, too many bindings\n"
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source_name
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| Output.Table_overflow ->
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Printf.fprintf stderr
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"File \"%s\":\ntransition table overflow, automaton is too big\n"
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source_name
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| _ ->
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raise exn
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end;
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exit 3
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let _ = (* Printexc.catch *) main (); exit 0
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