X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=sidebyside;f=ocaml%2Fparser.ml;h=fbce730c78915d11457b701ee46691fef2cae988;hb=dfcac7819cb61c55bf59e56f38f28be70fc95be7;hp=6bcb70d909fd0b6117292aa2cdcb3b9a7d88da0f;hpb=5682bf463b89edb7756020fe7b838eb846d6c771;p=fireball-separation.git

diff --git a/ocaml/parser.ml b/ocaml/parser.ml
index 6bcb70d..fbce730 100644
--- a/ocaml/parser.ml
+++ b/ocaml/parser.ml
@@ -1,8 +1,14 @@
-exception ParsingError of string;;
+type term =
+  | Var of int
+  | App of term * term
+  | Lam of term
+;;
 
-let mk_app x y = Num.mk_app x y;;
-let mk_lam x = `Lam(true, x);;
-let mk_var x = `Var(x, -666);;
+let mk_app x y = App(x, y);;
+let mk_lam x = Lam x;;
+let mk_var x = Var x;;
+
+exception ParsingError of string;;
 
 let isAlphaNum c = let n = Char.code c in
  (48 <= n && n <= 90) || (95 <= n && n <= 122) ;;
@@ -10,29 +16,30 @@ 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 =
-  let res = Bytes.create (List.length l) in
+  let res = String.create (List.length l) in
   let rec aux i = function
     | [] -> res
-    | c :: l -> Bytes.set res i c; aux (i + 1) l in
+    | c :: l -> String.set res i c; aux (i + 1) l in
   aux 0 l
 ;;
 
@@ -44,7 +51,12 @@ 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 +71,7 @@ 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 +85,12 @@ 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 +108,7 @@ 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
@@ -108,21 +120,21 @@ 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 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 ([], ([], [])) (* index zero is reserved *)
+  | _, _, _ -> assert false
+  in let aux = List.fold_left f ([], ([], []))
   in let (tms, (_, free)) = aux strs
   in (List.rev tms, free)
 ;;
@@ -140,7 +152,7 @@ let _ = prerr_endline (">>>" ^ string_of_term (parse "(\\x. x y z z1 k) z1 z j")
 
 *******************************************************************************)
 
-let problem_of_string s =
+(* let problem_of_string s =
  let lines = Str.split (Str.regexp "[\n\r\x0c\t;]+") s in
  let head, lines = List.hd lines, List.tl lines in
  let name = String.trim (String.sub head 1 (String.length head - 1)) in
@@ -169,7 +181,7 @@ let problem_of_string s =
  let strs = [div] @ ps @ conv in
 
  if List.length ps = 0 && List.length conv = 0
-  then raise (ParsingError "empty problem");
+  then raise (ParsingError "Parsed empty problem");
 
  (* parse' *)
  let (tms, free) = parse_many strs in
@@ -187,6 +199,7 @@ let problem_of_string s =
  let open Num in
  let exclude_bottom = function
  | #nf_nob as t -> t
+ (* actually, the following may be assert false *)
  | `Bottom -> raise (ParsingError "Input term not in normal form") in
  let rec aux_nob lev : nf_nob -> nf = function
  | `I((n,_), args) -> `I((n,(if lev = 0 then 0 else 1) + Listx.length args), Listx.map (fun t -> exclude_bottom (aux_nob lev t)) args)
@@ -206,17 +219,17 @@ let div = if not div_provided || div = `Bottom
  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
 ;;
@@ -234,4 +247,20 @@ let from_file path =
  let txt = String.concat "\n" (List.rev !lines) in
  let problems = Str.split (Str.regexp "[\n\r]+\\$") txt in
  List.map problem_of_string (List.tl (List.map ((^) "$") problems))
+;; *)
+
+let parse x =
+  match read_smt ([],[]) (explode x) with
+  | Some [y], [], _ -> y
+  | _, _, _ -> assert false
+;;
+
+
+let parse_many strs =
+  let f (x, y) z = match read_smt y (explode z) with
+  | Some[tm], [], vars -> (tm :: x, vars)
+  | _, _, _ -> assert false
+  in let aux = List.fold_left f ([], ([], []))
+  in let (tms, (_, free)) = aux strs
+  in (List.rev tms, free)
 ;;