1 (* Copyright (C) 2002, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
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15 * GNU General Public License for more details.
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22 * For details, see the HELM World-Wide-Web page,
23 * http://cs.unibo.it/helm/.
29 let reduction_tac ~reduction (proof,goal) =
30 let curi,metasenv,pbo,pty = proof in
31 let metano,context,ty = CicUtil.lookup_meta goal metasenv in
32 let new_ty = reduction context ty in
36 (n,_,_) when n = metano -> (metano,context,new_ty)
40 (curi,new_metasenv,pbo,pty), [metano]
44 (* The default of term is the thesis of the goal to be prooved *)
45 let reduction_tac ~reduction ~pattern:(hyp_patterns,goal_pattern) (proof,goal) =
46 let curi,metasenv,pbo,pty = proof in
47 let metano,context,ty = CicUtil.lookup_meta goal metasenv in
48 (* We don't know if [term] is a subterm of [ty] or a subterm of *)
49 (* the type of one metavariable. So we replace it everywhere. *)
50 (*CSC: Il vero problema e' che non sapendo dove sia il term non *)
51 (*CSC: sappiamo neppure quale sia il suo contesto!!!! Insomma, *)
52 (*CSC: e' meglio prima cercare il termine e scoprirne il *)
53 (*CSC: contesto, poi ridurre e infine rimpiazzare. *)
54 let replace context where terms =
55 (*CSC: Per il momento se la riduzione fallisce significa solamente che *)
56 (*CSC: siamo nel contesto errato. Metto il try, ma che schifo!!!! *)
57 (*CSC: Anche perche' cosi' catturo anche quelle del replace che non dovrei *)
59 let terms' = List.map (reduction context) terms in
60 ProofEngineReduction.replace ~equality:(==) ~what:terms ~with_what:terms'
65 let find_pattern_for name =
66 try Some (snd(List.find (fun (n, pat) -> Cic.Name n = name) hyp_patterns))
67 with Not_found -> None
70 match goal_pattern with
71 | None -> replace context ty [ty]
73 let terms = CicUtil.select ~term:ty ~context:pat in
74 let terms = List.map snd terms in
75 replace context ty terms
78 if hyp_patterns <> [] then
82 | Some (name,Cic.Decl term) ->
83 (match find_pattern_for name with
84 | None -> entry::context
86 let terms = CicUtil.select ~term ~context:pat in
87 let terms = List.map snd terms in
88 let where = replace context term terms in
89 let entry = Some (name,Cic.Decl where) in
91 | Some (name,Cic.Def (term, None)) ->
92 (match find_pattern_for name with
93 | None -> entry::context
95 let terms = CicUtil.select ~term ~context:pat in
96 let terms = List.map snd terms in
97 let where = replace context term terms in
98 let entry = Some (name,Cic.Def (where,None)) in
100 | _ -> entry::context
107 | (n,_,_) when n = metano -> (metano,context',ty')
111 (curi,metasenv',pbo,pty), [metano]
114 let simpl_tac ~pattern =
115 mk_tactic (reduction_tac ~reduction:ProofEngineReduction.simpl ~pattern);;
117 let reduce_tac ~pattern =
118 mk_tactic (reduction_tac ~reduction:ProofEngineReduction.reduce ~pattern);;
120 let whd_tac ~pattern =
121 mk_tactic (reduction_tac ~reduction:CicReduction.whd ~pattern);;
123 let normalize_tac ~pattern =
124 mk_tactic (reduction_tac ~reduction:CicReduction.normalize ~pattern );;
126 let fold_tac ~reduction ~also_in_hypotheses ~term =
127 let fold_tac ~reduction ~also_in_hypotheses ~term (proof,goal) =
128 let curi,metasenv,pbo,pty = proof in
129 let metano,context,ty = CicUtil.lookup_meta goal metasenv in
130 let term' = reduction context term in
131 (* We don't know if [term] is a subterm of [ty] or a subterm of *)
132 (* the type of one metavariable. So we replace it everywhere. *)
133 (*CSC: ma si potrebbe ovviare al problema. Ma non credo *)
134 (*CSC: che si guadagni nulla in fatto di efficienza. *)
136 ProofEngineReduction.replace ~equality:(=) ~what:[term'] ~with_what:[term]
138 let ty' = replace ty in
141 if also_in_hypotheses then
144 Some (n,Cic.Decl t) -> Some (n,Cic.Decl (replace t))
145 | Some (n,Cic.Def (t,None)) -> Some (n,Cic.Def ((replace t),None))
147 | Some (_,Cic.Def (_,Some _)) -> assert false
154 (n,_,_) when n = metano -> (metano,context',ty')
159 (curi,metasenv',pbo,pty), [metano]
161 mk_tactic (fold_tac ~reduction ~also_in_hypotheses ~term)