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Diffstat (limited to 'plugins/ltac/evar_tactics.ml')
-rw-r--r-- | plugins/ltac/evar_tactics.ml | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/plugins/ltac/evar_tactics.ml b/plugins/ltac/evar_tactics.ml new file mode 100644 index 00000000..9382f567 --- /dev/null +++ b/plugins/ltac/evar_tactics.ml @@ -0,0 +1,114 @@ +(************************************************************************) +(* * The Coq Proof Assistant / The Coq Development Team *) +(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *) +(* <O___,, * (see CREDITS file for the list of authors) *) +(* \VV/ **************************************************************) +(* // * This file is distributed under the terms of the *) +(* * GNU Lesser General Public License Version 2.1 *) +(* * (see LICENSE file for the text of the license) *) +(************************************************************************) + +open Util +open Names +open Term +open CErrors +open Evar_refiner +open Tacmach +open Tacexpr +open Refiner +open Evd +open Locus +open Context.Named.Declaration +open Ltac_pretype + +module NamedDecl = Context.Named.Declaration + +(* The instantiate tactic *) + +let instantiate_evar evk (ist,rawc) sigma = + let evi = Evd.find sigma evk in + let filtered = Evd.evar_filtered_env evi in + let constrvars = Tacinterp.extract_ltac_constr_values ist filtered in + let lvar = { + ltac_constrs = constrvars; + ltac_uconstrs = Names.Id.Map.empty; + ltac_idents = Names.Id.Map.empty; + ltac_genargs = ist.Geninterp.lfun; + } in + let sigma' = w_refine (evk,evi) (lvar ,rawc) sigma in + tclEVARS sigma' + +let evar_list sigma c = + let rec evrec acc c = + match EConstr.kind sigma c with + | Evar (evk, _ as ev) -> ev :: acc + | _ -> EConstr.fold sigma evrec acc c in + evrec [] c + +let instantiate_tac n c ido = + Proofview.V82.tactic begin fun gl -> + let sigma = gl.sigma in + let evl = + match ido with + ConclLocation () -> evar_list sigma (pf_concl gl) + | HypLocation (id,hloc) -> + let decl = Environ.lookup_named_val id (Goal.V82.hyps sigma (sig_it gl)) in + match hloc with + InHyp -> + (match decl with + | LocalAssum (_,typ) -> evar_list sigma (EConstr.of_constr typ) + | _ -> user_err Pp.(str "Please be more specific: in type or value?")) + | InHypTypeOnly -> + evar_list sigma (EConstr.of_constr (NamedDecl.get_type decl)) + | InHypValueOnly -> + (match decl with + | LocalDef (_,body,_) -> evar_list sigma (EConstr.of_constr body) + | _ -> user_err Pp.(str "Not a defined hypothesis.")) in + if List.length evl < n then + user_err Pp.(str "Not enough uninstantiated existential variables."); + if n <= 0 then user_err Pp.(str "Incorrect existential variable index."); + let evk,_ = List.nth evl (n-1) in + instantiate_evar evk c sigma gl + end + +let instantiate_tac_by_name id c = + Proofview.V82.tactic begin fun gl -> + let sigma = gl.sigma in + let evk = + try Evd.evar_key id sigma + with Not_found -> user_err Pp.(str "Unknown existential variable.") in + instantiate_evar evk c sigma gl + end + +let let_evar name typ = + let src = (Loc.tag Evar_kinds.GoalEvar) in + Proofview.Goal.enter begin fun gl -> + let sigma = Tacmach.New.project gl in + let env = Proofview.Goal.env gl in + let sigma = ref sigma in + let _ = Typing.e_sort_of env sigma typ in + let sigma = !sigma in + let id = match name with + | Name.Anonymous -> + let id = Namegen.id_of_name_using_hdchar env sigma typ name in + Namegen.next_ident_away_in_goal id (Termops.vars_of_env env) + | Name.Name id -> id + in + let (sigma, evar) = Evarutil.new_evar env sigma ~src ~naming:(Misctypes.IntroFresh id) typ in + Tacticals.New.tclTHEN (Proofview.Unsafe.tclEVARS sigma) + (Tactics.letin_tac None (Name.Name id) evar None Locusops.nowhere) + end + +let hget_evar n = + let open EConstr in + Proofview.Goal.nf_enter begin fun gl -> + let sigma = Tacmach.New.project gl in + let concl = Proofview.Goal.concl gl in + let evl = evar_list sigma concl in + if List.length evl < n then + user_err Pp.(str "Not enough uninstantiated existential variables."); + if n <= 0 then user_err Pp.(str "Incorrect existential variable index."); + let ev = List.nth evl (n-1) in + let ev_type = EConstr.existential_type sigma ev in + Tactics.change_concl (mkLetIn (Name.Anonymous,mkEvar ev,ev_type,concl)) + end |