1 files changed, 44 insertions, 0 deletions
diff --git a/src/main.ml b/src/main.ml
new file mode 100644
index 0000000..8d78987
--- /dev/null
+++ b/src/main.ml
@@ -0,0 +1,44 @@
+open Format
+open Lexing
+
+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 = []
+
+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
+		while true do
+			print_string (Pretty.token_str (Lexer.token buf));
+			print_string "\n"
+		done
+	with
+		| Lexer.End_of_file ->
+			exit 0
+		| Lexer.Lexing_error s ->
+			localisation (Lexing.lexeme_start_p buf);
+			eprintf "Lexical analysis error: %s@." s;
+			exit 1