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|
open Format
open Lexing
let parse_only = ref false
let dump = ref false
let ifile = ref ""
let set_var v s = v := s
let usage = "usage: mini-cpp [options] file.cpp"
let localisation pos =
let l = pos.pos_lnum in
let c = pos.pos_cnum - pos.pos_bol + 1 in
eprintf "File \"%s\", line %d, characters %d-%d:\n"
!ifile l (c-1) c
let options = [
"--parse-only", Arg.Set parse_only, "Stops after parsing of the input file.";
"--dump", Arg.Set dump, "Dump the AST after parsing."
]
let localisation pos =
let l = pos.pos_lnum in
let c = pos.pos_cnum - pos.pos_bol + 1 in
eprintf "File \"%s\", line %d, characters %d-%d:\n" !ifile l (c-1) c
let () =
Arg.parse options (set_var ifile) usage;
if !ifile = "" then (
eprintf "No input file\n@?";
exit 1);
if not (Filename.check_suffix !ifile ".cpp") then (
eprintf "Input files must have suffix .cpp\n@?";
Arg.usage options usage;
exit 1);
let f = open_in !ifile in
let buf = Lexing.from_channel f in
try
let p = Parser.prog Lexer.token buf in
close_in f;
if !dump then Pretty.print_prog p;
with
| Lexer.Lexing_error s ->
localisation (Lexing.lexeme_start_p buf);
eprintf "Lexical analysis error: %s@." s;
exit 1
| Parser.Error ->
localisation (Lexing.lexeme_start_p buf);
eprintf "Parsing error.@.";
exit 1
| _ ->
eprintf "Unexpected error...@.";
exit 2
|
