--- /dev/null
+(* Copyright (C) 2004-2005, HELM Team.
+ *
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ *
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ * For details, see the HELM World-Wide-Web page,
+ * http://helm.cs.unibo.it/
+ *)
+
+open Printf
+
+module Pt = CicNotationPt
+module Env = CicNotationEnv
+module Util = CicNotationUtil
+
+type pattern_id = int
+
+exception No_match
+
+module OrderedInt =
+ struct
+ type t = int
+ let compare (x1:t) (x2:t) = Pervasives.compare x2 x1 (* reverse order *)
+ end
+
+module IntSet = Set.Make (OrderedInt)
+
+let int_set_of_int_list l =
+ List.fold_left (fun acc i -> IntSet.add i acc) IntSet.empty l
+
+module type PATTERN =
+ sig
+ type pattern_t
+ val compatible : pattern_t -> pattern_t -> bool
+ end
+
+module Patterns (P: PATTERN) =
+ struct
+ type row_t = P.pattern_t list * P.pattern_t list * pattern_id
+ type t = row_t list
+
+ let empty = []
+
+ let matched = List.map (fun (matched, _, pid) -> matched, pid)
+
+ let partition t pidl =
+ let partitions = Hashtbl.create 11 in
+ let add pid row = Hashtbl.add partitions pid row in
+ (try
+ List.iter2 add pidl t
+ with Invalid_argument _ -> assert false);
+ let pidset = int_set_of_int_list pidl in
+ IntSet.fold
+ (fun pid acc ->
+ match Hashtbl.find_all partitions pid with
+ | [] -> acc
+ | patterns -> (pid, List.rev patterns) :: acc)
+ pidset []
+
+ let are_empty t =
+ match t with
+ | (_, [], _) :: _ -> true
+ (* if first row has an empty list of patterns, then others have as well *)
+ | _ -> false
+
+ (* return 2 lists of rows, first one containing homogeneous rows according
+ * to "compatible" below *)
+ let horizontal_split t =
+ let ap, first_row, t' =
+ match t with
+ | [] -> assert false
+ | (_, [], _) :: _ ->
+ assert false (* are_empty should have been invoked in advance *)
+ | ((_, hd :: _ , _) as row) :: tl -> hd, row, tl
+ in
+ let rec aux prev_t = function
+ | [] -> List.rev prev_t, []
+ | (_, [], _) :: _ -> assert false
+ | ((_, hd :: _, _) as row) :: tl when P.compatible ap hd ->
+ aux (row :: prev_t) tl
+ | t -> List.rev prev_t, t
+ in
+ aux [first_row] t'
+
+ (* return 2 lists, first one representing first column, second one
+ * representing a new pattern matrix where matched patterns have been moved
+ * to decl *)
+ let vertical_split t =
+ List.map
+ (function
+ | decls, hd :: tl, pid -> hd :: decls, tl, pid
+ | _ -> assert false)
+ t
+ end
+
+module T21 =
+struct
+
+module P = Patterns (CicNotationTag)
+
+(* let return_closure matched =
+ (fun matched_terms terms ->
+ prerr_endline "T21.return_closure";
+ match terms with
+ | [] -> matched_terms, matched
+ | _ -> assert false) *)
+
+let variable_closure k =
+ (fun matched_terms terms ->
+ prerr_endline "T21.variable_closure";
+ match terms with
+ | hd :: tl ->
+ prerr_endline (sprintf "binding: %s" (CicNotationPp.pp_term hd));
+ k (hd :: matched_terms) tl
+ | _ -> assert false)
+
+let constructor_closure ks k =
+ (fun matched_terms terms ->
+ prerr_endline "T21.constructor_closure";
+ match terms with
+ | t :: tl ->
+ prerr_endline (sprintf "on term %s" (CicNotationPp.pp_term t));
+ (try
+ let tag, subterms = CicNotationTag.get_tag t in
+ let k' = List.assoc tag ks in
+ k' matched_terms (subterms @ tl)
+ with Not_found -> k matched_terms terms)
+ | [] -> assert false)
+
+(* let fold_closure kind p_names names matcher success_k k =
+ let acc_name = try List.hd names with Failure _ -> assert false in
+|+ List.iter (fun (name, _) -> Printf.printf "/// %s\n" name) p_names ; +|
+ (fun matched_terms terms ->
+ prerr_endline "T21.fold_closure";
+ (match terms with
+ | t :: tl ->
+ let rec aux t =
+ prerr_endline "PORCA TORCIA SONO IN AUX" ;
+ match matcher t with
+ | _, [] -> None
+ | matched_terms, [matched_p, 0] -> Some (matched_terms, [])
+ | matched_terms, [matched_p, 1] ->
+ let acc = CicNotationEnv.lookup_term env acc_name in
+ let env = CicNotationEnv.remove env acc_name in
+ (match aux acc with
+ | None -> None
+ | Some env' -> Some (env :: env'))
+ | envl ->
+ List.iter
+ (fun (env, pid) ->
+ Printf.printf "*** %s %d\n" (CicNotationPp.pp_env env) pid)
+ envl ;
+ flush stdout ;
+ assert false |+ overlapping patterns, to be handled ... +|
+ in
+ (match aux t with
+ | None -> k terms envl
+ | Some env ->
+ let magic_env = CicNotationEnv.coalesce_env p_names env in
+ List.map (fun (env, pid) -> magic_env @ env, pid) envl)
+ | [] -> assert false)) *)
+
+let compiler0 rows match_cb fail_k =
+ let rec aux t k =
+ if t = [] then
+ k
+ else if P.are_empty t then
+ match_cb (P.matched t)
+ else
+ match P.horizontal_split t with
+ | t', [] ->
+ (match t' with
+ | []
+ | (_, [], _) :: _ -> assert false
+ | (_, Pt.Variable _ :: _, _) :: _ ->
+ variable_closure (aux (P.vertical_split t') k)
+ | _ ->
+ let tagl =
+ List.map
+ (function
+ | _, p :: _, _ -> fst (CicNotationTag.get_tag p)
+ | _ -> assert false)
+ t'
+ in
+ let clusters = P.partition t' tagl in
+ let ks =
+ List.map
+ (fun (tag, cluster) ->
+ let cluster' =
+ List.map (* add args as patterns heads *)
+ (function
+ | matched_p, p :: tl, pid ->
+ let _, subpatterns = CicNotationTag.get_tag p in
+ matched_p, subpatterns @ tl, pid
+ | _ -> assert false)
+ cluster
+ in
+ tag, aux cluster' k)
+ clusters
+ in
+ constructor_closure ks k)
+ | t', tl -> aux t' (aux tl k)
+ in
+ let t = List.map (fun (p, pid) -> [], [p], pid) rows in
+ let matcher = aux t (fun _ _ -> fail_k ()) in
+ (fun term -> matcher [] [term])
+
+let extract_magic term =
+ let magic_map = ref [] in
+ let add_magic m =
+ let name = Util.fresh_name () in
+ magic_map := (name, m) :: !magic_map;
+ Pt.Variable (Pt.TermVar name)
+ in
+ let rec aux = function
+ | Pt.AttributedTerm (_, t) -> aux t
+ | Pt.Literal _
+ | Pt.Layout _ -> assert false
+ | Pt.Variable v -> Pt.Variable v
+ | Pt.Magic m -> add_magic m
+ | t -> Util.visit_ast aux t
+ in
+ let term' = aux term in
+ term', !magic_map
+
+let env_of_matched pl tl =
+ List.map2
+ (fun p t ->
+ match p, t with
+ Pt.Variable (Pt.TermVar name), _ ->
+ name, (Env.TermType, Env.TermValue t)
+ | Pt.Variable (Pt.NumVar name), (Pt.Num (s, _)) ->
+ name, (Env.NumType, Env.NumValue s)
+ | Pt.Variable (Pt.IdentVar name), (Pt.Ident (s, None)) ->
+ name, (Env.StringType, Env.StringValue s)
+ | _ -> assert false)
+ pl tl
+
+let decls_of_pattern p =
+ List.map Env.declaration_of_var (Util.variables_of_term p)
+
+let rec compiler rows =
+ let rows', magic_maps =
+ List.split
+ (List.map
+ (fun (p, pid) ->
+ let p', map = extract_magic p in
+ (p', pid), (pid, map))
+ rows)
+ in
+ let magichecker map =
+ List.fold_left
+ (fun f (name, m) ->
+ let m_checker = compile_magic m in
+ (fun env ->
+ match m_checker (Env.lookup_term env name) env with
+ | None -> None
+ | Some env' -> f env'))
+ (fun env -> Some env)
+ map
+ in
+ let magichooser candidates =
+ List.fold_left
+ (fun f (pid, pl, checker) ->
+ (fun matched_terms ->
+ let env = env_of_matched pl matched_terms in
+ match checker env with
+ | None -> f matched_terms
+ | Some env -> Some (env, pid)))
+ (fun _ -> None)
+ candidates
+ in
+ let match_cb rows =
+ prerr_endline (sprintf "match_cb on %d row(s)" (List.length rows));
+ let candidates =
+ List.map
+ (fun (pl, pid) ->
+ let magic_map =
+ try List.assoc pid magic_maps with Not_found -> assert false
+ in
+ pid, pl, magichecker magic_map)
+ rows
+ in
+ (fun matched_terms _ -> magichooser candidates matched_terms)
+ in
+ compiler0 rows match_cb (fun _ -> None)
+
+and compile_magic = function
+ | Pt.Fold (kind, p_base, names, p_rec) ->
+ let p_rec_decls = decls_of_pattern p_rec in
+ let acc_name = try List.hd names with Failure _ -> assert false in
+ let t_magic = [p_base, 0; p_rec, 1] in
+ let compiled = compiler t_magic in
+ (fun term env ->
+ let rec aux term =
+ match compiled term with
+ | None -> None
+ | Some (env', 0) -> Some (env', [])
+ | Some (env', 1) ->
+ begin
+ let acc = Env.lookup_term env' acc_name in
+ let env'' = Env.remove env' acc_name in
+ match aux acc with
+ | None -> None
+ | Some (base_env, rec_envl) ->
+ Some (base_env, env'' :: rec_envl )
+ end
+ | _ -> assert false
+ in
+ match aux term with
+ | None -> None
+ | Some (base_env, rec_envl) ->
+ Some (base_env @ Env.coalesce_env p_rec_decls rec_envl))
+ | _ -> assert false
+
+end
+
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