--- /dev/null
+(* Copyright (C) 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/
+ *)
+
+(* $Id$ *)
+
+open Printf
+
+module Ast = CicNotationPt
+module Env = CicNotationEnv
+module Pp = CicNotationPp
+module Util = CicNotationUtil
+
+let get_tag term0 =
+ let subterms = ref [] in
+ let map_term t =
+ subterms := t :: !subterms ;
+ Ast.Implicit
+ in
+ let rec aux t = CicNotationUtil.visit_ast ~special_k map_term t
+ and special_k = function
+ | Ast.AttributedTerm (_, t) -> aux t
+ | _ -> assert false
+ in
+ let term_mask = aux term0 in
+ let tag = Hashtbl.hash term_mask in
+ tag, List.rev !subterms
+
+module Matcher21 =
+struct
+ module Pattern21 =
+ struct
+ type pattern_t = Ast.term
+ type term_t = Ast.term
+ let rec classify = function
+ | Ast.AttributedTerm (_, t) -> classify t
+ | Ast.Variable _ -> PatternMatcher.Variable
+ | Ast.Magic _
+ | Ast.Layout _
+ | Ast.Literal _ -> assert false
+ | _ -> PatternMatcher.Constructor
+ let tag_of_pattern = get_tag
+ let tag_of_term t = get_tag t
+ let string_of_term = CicNotationPp.pp_term
+ let string_of_pattern = CicNotationPp.pp_term
+ end
+
+ module M = PatternMatcher.Matcher (Pattern21)
+
+ 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;
+ Ast.Variable (Ast.TermVar name)
+ in
+ let rec aux = function
+ | Ast.AttributedTerm (_, t) -> assert false
+ | Ast.Literal _
+ | Ast.Layout _ -> assert false
+ | Ast.Variable v -> Ast.Variable v
+ | Ast.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 =
+ try
+ List.map2
+ (fun p t ->
+ match p, t with
+ Ast.Variable (Ast.TermVar name), _ ->
+ name, (Env.TermType, Env.TermValue t)
+ | Ast.Variable (Ast.NumVar name), (Ast.Num (s, _)) ->
+ name, (Env.NumType, Env.NumValue s)
+ | Ast.Variable (Ast.IdentVar name), (Ast.Ident (s, None)) ->
+ name, (Env.StringType, Env.StringValue s)
+ | _ -> assert false)
+ pl tl
+ with Invalid_argument _ -> assert false
+
+ 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 ctors ->
+ match m_checker (Env.lookup_term env name) env ctors with
+ | None -> None
+ | Some (env, ctors) -> f env ctors))
+ (fun env ctors -> Some (env, ctors))
+ map
+ in
+ let magichooser candidates =
+ List.fold_left
+ (fun f (pid, pl, checker) ->
+ (fun matched_terms constructors ->
+ let env = env_of_matched pl matched_terms in
+ match checker env constructors with
+ | None -> f matched_terms constructors
+ | Some (env, ctors') ->
+ let magic_map =
+ try List.assoc pid magic_maps with Not_found -> assert false
+ in
+ let env' = Env.remove_names env (List.map fst magic_map) in
+ Some (env', ctors', pid)))
+ (fun _ _ -> None)
+ (List.rev candidates)
+ in
+ let match_cb 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
+ magichooser candidates
+ in
+ M.compiler rows' match_cb (fun _ -> None)
+
+ and compile_magic = function
+ | Ast.Fold (kind, p_base, names, p_rec) ->
+ let p_rec_decls = Env.declarations_of_term p_rec in
+ (* LUCA: p_rec_decls should not contain "names" *)
+ let acc_name = try List.hd names with Failure _ -> assert false in
+ let compiled_base = compiler [p_base, 0]
+ and compiled_rec = compiler [p_rec, 0] in
+ (fun term env ctors ->
+ let aux_base term =
+ match compiled_base term with
+ | None -> None
+ | Some (env', ctors', _) -> Some (env', ctors', [])
+ in
+ let rec aux term =
+ match compiled_rec term with
+ | None -> aux_base term
+ | Some (env', ctors', _) ->
+ begin
+ let acc = Env.lookup_term env' acc_name in
+ let env'' = Env.remove_name env' acc_name in
+ match aux acc with
+ | None -> aux_base term
+ | Some (base_env, ctors', rec_envl) ->
+ let ctors'' = ctors' @ ctors in
+ Some (base_env, ctors'',env'' :: rec_envl)
+ end
+ in
+ match aux term with
+ | None -> None
+ | Some (base_env, ctors, rec_envl) ->
+ let env' =
+ base_env @ Env.coalesce_env p_rec_decls rec_envl @ env
+ (* @ env LUCA!!! *)
+ in
+ Some (env', ctors))
+
+ | Ast.Default (p_some, p_none) -> (* p_none can't bound names *)
+ let p_some_decls = Env.declarations_of_term p_some in
+ let p_none_decls = Env.declarations_of_term p_none in
+ let p_opt_decls =
+ List.filter
+ (fun decl -> not (List.mem decl p_none_decls))
+ p_some_decls
+ in
+ let none_env = List.map Env.opt_binding_of_name p_opt_decls in
+ let compiled = compiler [p_some, 0] in
+ (fun term env ctors ->
+ match compiled term with
+ | None -> Some (none_env, ctors) (* LUCA: @ env ??? *)
+ | Some (env', ctors', 0) ->
+ let env' =
+ List.map
+ (fun (name, (ty, v)) as binding ->
+ if List.exists (fun (name', _) -> name = name') p_opt_decls
+ then Env.opt_binding_some binding
+ else binding)
+ env'
+ in
+ Some (env' @ env, ctors' @ ctors)
+ | _ -> assert false)
+
+ | Ast.If (p_test, p_true, p_false) ->
+ let compiled_test = compiler [p_test, 0]
+ and compiled_true = compiler [p_true, 0]
+ and compiled_false = compiler [p_false, 0] in
+ (fun term env ctors ->
+ let branch =
+ match compiled_test term with
+ | None -> compiled_false
+ | Some _ -> compiled_true
+ in
+ match branch term with
+ | None -> None
+ | Some (env', ctors', _) -> Some (env' @ env, ctors' @ ctors))
+
+ | Ast.Fail -> (fun _ _ _ -> None)
+
+ | _ -> assert false
+end
+
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