Catch syntax errors

src/main.ml

@@ -9,28 +9,22 @@ let print_debug d s =
 let print_verbose v s =
   if v then Format.printf "\x1b[33;01;04mStatus:\x1b[0m %s\n" s else ()
 
-(** The following function should check whether the program is well-formed, by
-  * induction:
-  *  - for any applications of the form (n, arg1, ..., argn)
-  *    + n exists
-  *    + n waits n arguments
-  *    + arg1, ..., argn are well-typed
-  *  - The expressions are well-typed
-  *  - The equations are well typed
-  *  - The output is set
-  *)
-let check_well_formedness (a: t_nodelist) = Some a
-let check_dependencies (a: t_nodelist) = Some a
-let simplify_prog (a: t_nodelist) = Some a
-
-let run verbose debug (passes: (t_nodelist -> t_nodelist option) list) ast
-  = verbose "RUN_PLACEHOLDER";
-    Format.printf "%a" Ast_to_c.ast_to_c ast
+let run ast verbose debug passes =
+  let rec aux ast = function
+    | [] ->  Format.printf "%a" Ast_to_c.ast_to_c ast
+    | (n, p) :: passes ->
+        match p ast with
+        | None -> (exit_error ("Error while in the pass "^n^".\n"); exit 0)
+        | Some ast -> aux ast passes
+  in
+  aux ast passes
 
 let _ =
   (** Usage and argument parsing. *)
-  let default_passes = ["check_form"; "check_dependencies"; "simplify_prog"] in
-  let usage_msg = "Usage: main [-passes p1,...,pn] [-ast] [-verbose] [-debug] [-o output_file] source_file" in
+  let default_passes = ["pre2vars"] in
+  let usage_msg =
+    "Usage: main [-passes p1,...,pn] [-ast] [-verbose] [-debug] \
+      [-o output_file] source_file\n" in
   let verbose = ref false in
   let debug = ref false in
   let ppast = ref false in
@@ -57,9 +51,7 @@ let _ =
   let passes_table : (string,  t_nodelist -> t_nodelist option) Hashtbl.t = Hashtbl.create 100 in
   List.iter (fun (s, k) -> Hashtbl.add passes_table s k)
     [
-      ("check_form", check_well_formedness);
-      ("check_dependencies", check_dependencies);
-      ("simplify_prog", simplify_prog);
+      ("pre2vars", Passes.pre2vars);
     ];
 
   (** Main functionality below *)
@@ -81,16 +73,24 @@ let _ =
         Format.printf "Syntax error at %a: %s\n\n"
           Pp.pp_loc (l, !source_file) s;
         exit 0
-      end in
+      end
+    | Parsing.Parse_error ->
+      begin
+        close_in_noerr inchan;
+        Parsing.(
+        Format.printf "Syntax error at %a\n\n"
+          Pp.pp_loc ((symbol_start_pos (), symbol_end_pos()), !source_file));
+        exit 0
+      end
+    in
 
   if !ppast then Format.printf "%a" Pp.pp_ast ast
   else
-    let passes = List.map (fun (pass: string) ->
+    let passes = List.map (fun (pass: string) -> (pass,
       match Hashtbl.find_opt passes_table pass with
       | None ->
         (exit_error (Format.sprintf "The pass %s does not exist." pass); exit 0)
       | Some f ->
-        (print_debug ("The pass "^pass^" has been selected."); f)) !passes in
-    run print_verbose print_debug passes ast;
-    print_verbose "End of the program, exiting gracefully."
+        (print_debug ("The pass "^pass^" has been selected."); f))) !passes in
+    run ast print_verbose print_debug passes
 

src/parser.mly

@@ -383,4 +383,3 @@ ident_comma_list:
   | IDENT COMMA ident_comma_list { $1 :: $3 }
 ;
 
-

src/utils.ml

@@ -1,5 +1,11 @@
 open Ast
 
+let rec list_map_option (f: 'a -> 'b option) (l: 'a list) : 'b list option =
+  List.fold_right (fun elt acc ->
+    match acc, f elt with
+    | None, _ | _, None -> None
+    | Some acc, Some elt -> Some (elt :: acc)) l (Some [])
+
 let rec list_repeat n elt =
   if n = 0 then [] else elt :: (list_repeat (n-1) elt)
 
@@ -27,3 +33,4 @@ let type_exp : t_expression -> full_ty = function
   | ETuple (full_ty , _) -> full_ty
   | EApp   (full_ty , _ , _) -> full_ty
 
+let somify f = fun e -> Some (f e)