X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=ocaml%2Fparser.ml;h=1dd4b583c8886216ee6910392103965253b1be05;hb=417e6bbe7973c9413216a87dff01f920d39e4657;hp=902da8d38bfdb8473d14f05dd5fbedee2e55da51;hpb=1398932771b9914e73cbef512195305ae60af8a5;p=fireball-separation.git

diff --git a/ocaml/parser.ml b/ocaml/parser.ml
index 902da8d..1dd4b58 100644
--- a/ocaml/parser.ml
+++ b/ocaml/parser.ml
@@ -10,22 +10,23 @@ let isSpace c = c = ' ' || c = '\n' || c = '\t' ;;
 
 (* FIXME *)
 let mk_var' (bound, free) x =
-  if List.mem x bound
+  if x <> "@" && List.mem x bound
   then free, mk_var (Util.index_of x bound)
-  else if List.mem x free
+  else if x <> "@" && List.mem x free
        then free, mk_var (List.length bound + Util.index_of x free)
        else (free @ [x]), mk_var (List.length bound + List.length free)
 ;;
 
 let mk_app' = function
-  | [] ->  raise (ParsingError "bug")
+  | [] ->  assert false
   | t :: ts -> List.fold_left mk_app t ts
 ;;
 
 let explode s =
+ let len = String.length s in
   let rec aux i l =
-    if i < 0 then l else aux (i - 1) (s.[i] :: l)
-  in aux (String.length s - 1) []
+    if i >= len || s.[i] = '#' then l else aux (i+1) (s.[i] :: l)
+  in List.rev (aux 0 [])
 ;;
 
 let implode l =
@@ -44,7 +45,12 @@ let rec strip_spaces = function
 let read_var s =
   let rec aux = function
   | [] -> None, []
-  | c::cs as x -> if isAlphaNum c
+  | c::cs as x ->
+    if c = '@' then
+     (if cs <> [] && (let hd = List.hd cs in hd = '@' || isAlphaNum hd)
+     then raise (ParsingError ("Unexpected `"^String.make 1 (List.hd cs)^"` after `@`."))
+     else Some['@'], cs)
+    else if isAlphaNum c
     then match aux cs with
          | (Some x), cs' -> Some (c :: x), cs'
          | None, cs' -> (Some [c]), cs'
@@ -59,7 +65,7 @@ let read_var' (bound, free as vars) s =
   | Some varname, cs ->
     let free, v = mk_var' vars varname in
     Some [v], cs, (bound, free)
-  | _, _ -> raise (ParsingError ("Can't read variable"))
+  | None, _ -> raise (ParsingError ("Can't read variable"))
 ;;
 
 let rec read_smt vars =
@@ -73,12 +79,12 @@ let rec read_smt vars =
       | Some varname, cs ->
       let vars' = (varname::bound, free) in
       (match strip_spaces cs with
-        | [] -> raise (ParsingError "manca dopo variabile lambda")
+        | [] -> raise (ParsingError "Lambda expression incomplete")
         | c::cs -> (if c = '.' then (match read_smt vars' cs with
-          | None, _, _ -> raise (ParsingError "manca corpo lambda")
+          | None, _, _ -> raise (ParsingError "Lambda body expected")
           | Some [x], y, (_, free) -> Some [mk_lam x], y, (bound, free)
-          | Some _, _, _ -> raise (ParsingError "???")
-          ) else raise (ParsingError "manca . nel lambda")
+          | Some _, _, _ -> assert false
+          ) else raise (ParsingError "Expected `.` after variable in lambda")
         ))
       | _, _ -> assert false
  ) in let rec aux vars cs =
@@ -96,7 +102,7 @@ let rec read_smt vars =
           | None, cs, vars -> Some [tm], cs, vars
           | Some ts, cs, vars -> Some (tm :: ts), cs, vars
         )
-      | Some _ -> raise (ParsingError "bug")
+      | Some _ -> assert false
       | None -> None, x, vars
   in fun cs -> match aux vars cs with
     | None, cs, vars -> None, cs, vars
@@ -108,102 +114,72 @@ and read_pars vars = function
     let cs = strip_spaces cs in
     match cs with
       | [] -> None, [], vars
-      | c::cs -> if c = ')' then tm, cs, vars else raise (ParsingError ") mancante")
-    ) else raise (ParsingError "???")
+      | c::cs -> if c = ')' then tm, cs, vars else raise (ParsingError "Missing `)`")
+    ) else assert false
 ;;
 
 let parse x =
   match read_smt ([],[]) (explode x) with
   | Some [y], [], _ -> y
-  | _, _, _ -> raise (ParsingError "???")
+  | _, _, _ -> assert false
 ;;
 
-let var_zero = "ω";; (* w is an invalid variable name *)
-
 let parse_many strs =
   let f (x, y) z = match read_smt y (explode z) with
   | Some[tm], [], vars -> (tm :: x, vars)
-  | _, _, _ -> raise (ParsingError "???")
-  in let aux = List.fold_left f ([], ([], [var_zero])) (* index zero is reserved *)
+  | _, _, _ -> assert false
+  in let aux = List.fold_left f ([], ([], []))
   in let (tms, (_, free)) = aux strs
   in (List.rev tms, free)
 ;;
 
-(**********************************************************************
-
-let rec string_of_term = function
-  | Tvar n -> string_of_int n
-  | Tapp(t1, t2) -> "(" ^ string_of_term t1 ^ " " ^ string_of_term t2 ^ ")"
-  | Tlam(t1) -> "(\\" ^ string_of_term t1 ^ ")"
-;;
-
-let _ = prerr_endline (">>>" ^ string_of_term (parse "(\\x. x y z z1 k) z1 z j"));;
-
-
-**********************************************************************)
-
- let parse' strs =
-   let (tms, free) = parse_many strs in
-   (* Replace pacmans and bottoms *)
-   let n_bot = try Util.index_of "BOT" free with Not_found -> min_int in
-   let n_pac = try Util.index_of "PAC" free with Not_found -> min_int in
-   let n_bomb = try Util.index_of "BOMB" free with Not_found -> min_int in
-   let fix lev v =
-    if v = lev + n_bot then failwith "Example with `Bottom"
-     else if v = lev + n_pac then failwith "Example with `Pacman"
-      else if v = lev + n_bomb then failwith "Example with `Bomb"
-       else `Var(v,1) in (* 1 by default when variable not applied *)
-   (* Fix arity *)
-   let open Num in
-   let rec aux lev : nf -> nf = function
-   | `I((n,_), args) -> `I((n,1 + Listx.length args), Listx.map (fun t -> aux lev t) args)
-   | `Var(n,_) -> fix lev n
-   | `Lam(_,t) -> `Lam (true, aux (lev+1) t)
-   | `Match _ | `N _ -> assert false in
- List.map (aux 0) (tms :> Num.nf list), free
-;;
-
 let problem_of_string s =
-prerr_endline (s);
  let lines = Str.split (Str.regexp "[\n\r\x0c\t;]+") s in
- (* let lines = List.map String.trim lines in *)
+ let head, lines = List.hd lines, List.tl lines in
+ let name = String.trim (String.sub head 1 (String.length head - 1)) in
  let lines = List.filter ((<>) "") lines in
- prerr_endline("number of lines" ^ string_of_int (List.length lines));
- let aux (last, name, div, conv, ps) line =
+ let aux (last, div, conv, ps) line =
   let chr = String.sub line 0 1 in
   let line = String.trim (String.sub line 1 (String.length line - 1)) in
-  if line = "" then chr, name, div, conv, ps else
+  if line = "" then chr, div, conv, ps else
   let rec aux' chr line =
    if chr = "#"
-    then chr, name, div, conv, ps
-   else if chr = "$"
-    then "#", line, div, conv, ps
+    then chr, div, conv, ps
    else if chr = "D"
-    then chr, name, line, conv, ps
+    then chr, line, conv, ps
    else if chr = "C"
-    then chr, name, div, line::conv, ps
+    then chr, div, line::conv, ps
    else if chr = "N"
-    then chr, name, div, conv, line::ps
+    then chr, div, conv, line::ps
    else if chr = " "
     then aux' last line
    else raise (ParsingError
      ("Unexpected at beginning of problem: `" ^ chr ^ "` " ^ line)) in
   aux' chr line in
- let _, name, div, conv, ps = List.fold_left aux ("#", "no label", "", [], []) lines in
+ let _, div, conv, ps = List.fold_left aux ("#", "", [], []) lines in
  let div_provided = div <> "" in
  let div = if div_provided then div else "xxxxxx" in
  let strs = [div] @ ps @ conv in
 
- if strs = ["BOT"]
-  then raise (ParsingError "empty problem");
+ if List.length ps = 0 && List.length conv = 0
+  then raise (ParsingError "Parsed empty problem");
 
  (* parse' *)
  let (tms, free) = parse_many strs in
+ let n_bot = try Util.index_of "BOT" free with Not_found -> min_int in
+ let n_pac = try Util.index_of "PAC" free with Not_found -> min_int in
+ let n_bomb = try Util.index_of "BOMB" free with Not_found -> min_int in
+ let fix lev v =
+ if v = lev + n_bot then failwith "Example with `Bottom"
+  else if v = lev + n_pac then failwith "Example with `Pacman"
+   else if v = lev + n_bomb then failwith "Example with `Bomb"
+    else if v = lev then `Var(v, min_int) (* zero *)
+      else `Var(v,1) in (* 1 by default when variable not applied *)
  (* Fix arity *)
  let open Num in
  let rec aux lev : nf -> nf = function
- | `I((n,_), args) -> `I((n,1 + Listx.length args), Listx.map (fun t -> aux lev t) args)
- | `Var(n,_) -> `Var(n,1)
+ | `I((n,_), args) -> `I((n,(if lev = 0 then 0 else 1) + Listx.length args), Listx.map (aux lev) args)
+ | `Var(n,_) -> fix lev n
  | `Lam(_,t) -> `Lam (true, aux (lev+1) t)
  | `Match _ | `N _ -> assert false in
 let all_tms = List.map (aux 0) (tms :> Num.nf list) in
@@ -215,24 +191,24 @@ let div = if not div_provided
  then None
  else match div with
   | `I _ as t -> Some t
-  | _ -> raise (ParsingError "div is not an inert or BOT in the initial problem") in
+  | _ -> raise (ParsingError "D is not an inert in the initial problem") in
 let conv = Util.filter_map (
  function
  | #i_n_var as t -> Some t
  | `Lam _ -> None
- | _ -> raise (ParsingError "A term in conv is not i_n_var")
+ | _ -> raise (ParsingError "A C-term is not i_n_var")
  ) conv in
 let ps = List.map (
  function
   | #i_n_var as y -> y
-  | _ as y -> raise (ParsingError ("A term in num is not i_n_var" ^ Num.string_of_nf y))
+  | _ -> raise (ParsingError "An N-term is not i_n_var")
  ) ps in
  name, div, conv, ps, free
 ;;
 
 
 let from_file path =
- let lines = ref [""] in
+ let lines = ref ["#"] in
  let chan = open_in path in
  let _ = try
   while true; do