1 (* Copyright (C) 2002, HELM Team.
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4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
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27 let rewrite_tac ~term:equality ~status:(proof,goal) =
29 let module U = UriManager in
30 let curi,metasenv,pbo,pty = proof in
31 let metano,context,gty = List.find (function (m,_,_) -> m=goal) metasenv in
32 let eq_ind_r,ty,t1,t2 =
33 match CicTypeChecker.type_of_aux' metasenv context equality with
34 C.Appl [C.MutInd (uri,0,[]) ; ty ; t1 ; t2]
35 when U.eq uri (U.uri_of_string "cic:/Coq/Init/Logic/eq.ind") ->
38 (U.uri_of_string "cic:/Coq/Init/Logic/eq_ind_r.con",[])
41 | C.Appl [C.MutInd (uri,0,[]) ; ty ; t1 ; t2]
42 when U.eq uri (U.uri_of_string "cic:/Coq/Init/Logic_Type/eqT.ind") ->
45 (U.uri_of_string "cic:/Coq/Init/Logic_Type/eqT_ind_r.con",[])
50 (ProofEngineTypes.Fail
51 "Rewrite: the argument is not a proof of an equality")
54 let gty' = CicSubstitution.lift 1 gty in
55 let t1' = CicSubstitution.lift 1 t1 in
57 ProofEngineReduction.replace_lifting
58 ~equality:ProofEngineReduction.alpha_equivalence
59 ~what:t1' ~with_what:(C.Rel 1) ~where:gty'
62 (ProofEngineHelpers.mk_fresh_name context C.Anonymous ty, ty, gty'')
64 let fresh_meta = ProofEngineHelpers.new_meta proof in
66 ProofEngineHelpers.identity_relocation_list_for_metavariable context in
67 let metasenv' = (fresh_meta,context,C.Appl [pred ; t2])::metasenv in
70 PrimitiveTactics.exact_tac
72 [eq_ind_r ; ty ; t2 ; pred ; C.Meta (fresh_meta,irl) ; t1 ;equality])
73 ~status:((curi,metasenv',pbo,pty),goal)
75 assert (List.length goals = 0) ;
80 let rewrite_simpl_tac ~term ~status =
82 ~start:(rewrite_tac ~term)
84 (ReductionTactics.simpl_tac ~also_in_hypotheses:false ~terms:None)
89 let rewrite_back_tac ~term:equality ~status:(proof,goal) =
91 let module U = UriManager in
92 let curi,metasenv,pbo,pty = proof in
93 let metano,context,gty = List.find (function (m,_,_) -> m=goal) metasenv in
94 let eq_ind_r,ty,t1,t2 =
95 match CicTypeChecker.type_of_aux' metasenv context equality with
96 C.Appl [C.MutInd (uri,0,[]) ; ty ; t1 ; t2]
97 when U.eq uri (U.uri_of_string "cic:/Coq/Init/Logic/eq.ind") ->
100 (U.uri_of_string "cic:/Coq/Init/Logic/eq_ind.con",[])
103 | C.Appl [C.MutInd (uri,0,[]) ; ty ; t1 ; t2]
104 when U.eq uri (U.uri_of_string "cic:/Coq/Init/Logic_Type/eqT.ind") ->
107 (U.uri_of_string "cic:/Coq/Init/Logic_Type/eqT_ind.con",[])
112 (ProofEngineTypes.Fail
113 "Rewrite: the argument is not a proof of an equality")
116 let gty' = CicSubstitution.lift 1 gty in
117 let t1' = CicSubstitution.lift 1 t1 in
119 ProofEngineReduction.replace_lifting
120 ~equality:ProofEngineReduction.alpha_equivalence
121 ~what:t1' ~with_what:(C.Rel 1) ~where:gty'
124 (ProofEngineHelpers.mk_fresh_name context C.Anonymous ty, ty, gty'')
126 let fresh_meta = ProofEngineHelpers.new_meta proof in
128 ProofEngineHelpers.identity_relocation_list_for_metavariable context in
129 let metasenv' = (fresh_meta,context,C.Appl [pred ; t2])::metasenv in
132 PrimitiveTactics.exact_tac
134 [eq_ind_r ; ty ; t2 ; pred ; C.Meta (fresh_meta,irl) ; t1 ;equality])
135 ~status:((curi,metasenv',pbo,pty),goal)
137 assert (List.length goals = 0) ;
138 (proof',[fresh_meta])
143 let rewrite_back_simpl_tac ~term ~status =
145 ~start:(rewrite_back_tac ~term)
147 (ReductionTactics.simpl_tac ~also_in_hypotheses:false ~terms:None)
152 let replace_tac ~what ~with_what ~status:((proof, goal) as status) =
153 let module C = Cic in
154 let module U = UriManager in
155 let module P = PrimitiveTactics in
156 let module T = Tacticals in
157 let _,metasenv,_,_ = proof in
158 let _,context,_ = List.find (function (m,_,_) -> m=goal) metasenv in
159 let wty = CicTypeChecker.type_of_aux' metasenv context what in
161 if (wty = (CicTypeChecker.type_of_aux' metasenv context with_what))
166 (C.MutInd ((U.uri_of_string "cic:/Coq/Init/Logic/eq.ind"), 0, [])) ; (* quale uguaglianza usare, eq o eqT ? *)
172 ~start:(rewrite_back_tac ~term:(C.Rel 1))
174 ProofEngineStructuralRules.clear
175 ~hyp:(List.hd context)) ;
178 else raise (ProofEngineTypes.Fail "Replace: terms not replaceable")
179 with (Failure "hd") -> raise (ProofEngineTypes.Fail "Replace: empty context")
183 (* All these tacs do is applying the right constructor/theorem *)
185 let reflexivity_tac =
186 IntroductionTactics.constructor_tac ~n:1
190 let symmetry_tac ~status:(proof, goal) =
191 let module C = Cic in
192 let module R = CicReduction in
193 let module U = UriManager in
194 let (_,metasenv,_,_) = proof in
195 let metano,context,ty = List.find (function (m,_,_) -> m=goal) metasenv in
196 match (R.whd context ty) with
197 (C.Appl [(C.MutInd (uri, 0, [])); _; _; _]) when (U.eq uri (U.uri_of_string "cic:/Coq/Init/Logic/eq.ind")) ->
198 PrimitiveTactics.apply_tac ~status:(proof,goal)
199 ~term: (C.Const (U.uri_of_string "cic:/Coq/Init/Logic/sym_eq.con", []))
201 | (C.Appl [(C.MutInd (uri, 0, [])); _; _; _]) when (U.eq uri (U.uri_of_string "cic:/Coq/Init/Logic_Type/eqT.ind")) ->
202 PrimitiveTactics.apply_tac ~status:(proof,goal)
203 ~term: (C.Const (U.uri_of_string "cic:/Coq/Init/Logic_Type/sym_eqT.con", []))
205 | _ -> raise (ProofEngineTypes.Fail "Symmetry failed")
209 let transitivity_tac ~term ~status:((proof, goal) as status) =
210 let module C = Cic in
211 let module R = CicReduction in
212 let module U = UriManager in
213 let module T = Tacticals in
214 let (_,metasenv,_,_) = proof in
215 let metano,context,ty = List.find (function (m,_,_) -> m=goal) metasenv in
216 match (R.whd context ty) with
217 (C.Appl [(C.MutInd (uri, 0, [])); _; _; _]) when (uri = (U.uri_of_string "cic:/Coq/Init/Logic/eq.ind")) ->
219 ~start:(PrimitiveTactics.apply_tac
220 ~term: (C.Const (U.uri_of_string "cic:/Coq/Init/Logic/trans_eq.con", [])))
222 [PrimitiveTactics.exact_tac ~term ; T.id_tac ; T.id_tac]
225 | (C.Appl [(C.MutInd (uri, 0, [])); _; _; _]) when (uri = (U.uri_of_string "cic:/Coq/Init/Logic_Type/eqT.ind")) ->
227 ~start:(PrimitiveTactics.apply_tac
228 ~term: (C.Const (U.uri_of_string "cic:/Coq/Init/Logic_Type/trans_eqT.con", [])))
230 [T.id_tac ; T.id_tac ; PrimitiveTactics.exact_tac ~term]
233 | _ -> raise (ProofEngineTypes.Fail "Transitivity failed")