105 lines
2.8 KiB
OCaml
105 lines
2.8 KiB
OCaml
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(* The lexer generator. Command-line parsing. *)
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open Syntax
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open Scanner
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open Grammar
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open Lexgen
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open Output
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let main () =
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if Array.length Sys.argv <> 2 then begin
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prerr_string "Usage: camllex <input file>\n";
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exit 2
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end;
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let source_name = Sys.argv.(1) in
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let dest_name =
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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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ic := open_in source_name;
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oc := open_out dest_name;
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let lexbuf = Lexing.from_channel !ic in
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let (Lexdef(header,_) as def) =
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try
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Grammar.lexer_definition Scanner.main lexbuf
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with
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Parsing.Parse_error ->
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prerr_string "Syntax error around char ";
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prerr_int (Lexing.lexeme_start lexbuf);
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prerr_endline ".";
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exit 2
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| Scan_aux.Lexical_error s ->
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prerr_string "Lexical error around char ";
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prerr_int (Lexing.lexeme_start lexbuf);
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prerr_string ": ";
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prerr_string s;
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prerr_endline ".";
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exit 2 in
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let ((init, states, acts) as dfa) = make_dfa def in
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output_lexdef header dfa;
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close_in !ic;
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close_out !oc
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let _ = main(); exit 0
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(*****
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let main () =
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ic := stdin;
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oc := stdout;
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let lexbuf = lexing.from_channel ic in
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let (Lexdef(header,_) as def) =
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try
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grammar.lexer_definition scanner.main lexbuf
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with
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parsing.Parse_error x ->
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prerr_string "Syntax error around char ";
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prerr_int (lexing.lexeme_start lexbuf);
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prerr_endline ".";
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sys.exit 2
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| scan_aux.Lexical_error s ->
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prerr_string "Lexical error around char ";
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prerr_int (lexing.lexeme_start lexbuf);
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prerr_string ": ";
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prerr_string s;
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prerr_endline ".";
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sys.exit 2 in
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let ((init, states, acts) as dfa) = make_dfa def in
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output_lexdef header dfa
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****)
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(****
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let debug_scanner lexbuf =
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let tok = scanner.main lexbuf in
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begin match tok with
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Tident s -> prerr_string "Tident "; prerr_string s
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| Tchar c -> prerr_string "Tchar "; prerr_char c
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| Tstring s -> prerr_string "Tstring "; prerr_string s
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| Taction(Location(i1,i2)) ->
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prerr_string "Taction "; prerr_int i1; prerr_string "-";
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prerr_int i2
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| Trule -> prerr_string "Trule"
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| Tparse -> prerr_string "Tparse"
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| Tand -> prerr_string "Tand"
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| Tequal -> prerr_string "Tequal"
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| Tend -> prerr_string "Tend"
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| Tor -> prerr_string "Tor"
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| Tunderscore -> prerr_string "Tunderscore"
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| Teof -> prerr_string "Teof"
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| Tlbracket -> prerr_string "Tlbracket"
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| Trbracket -> prerr_string "Trbracket"
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| Tstar -> prerr_string "Tstar"
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| Tmaybe -> prerr_string "Tmaybe"
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| Tplus -> prerr_string "Tplus"
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| Tlparen -> prerr_string "Tlparen"
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| Trparen -> prerr_string "Trparen"
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| Tcaret -> prerr_string "Tcaret"
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| Tdash -> prerr_string "Tdash"
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end;
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prerr_newline();
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tok
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****)
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