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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i $Id: Tactics.v 11282 2008-07-28 11:51:53Z msozeau $ i*)
(** This module implements various tactics used to simplify the goals produced by Program,
which are also generally useful. *)
(** Destructs one pair, without care regarding naming. *)
Ltac destruct_one_pair :=
match goal with
| [H : (_ /\ _) |- _] => destruct H
| [H : prod _ _ |- _] => destruct H
end.
(** Repeateadly destruct pairs. *)
Ltac destruct_pairs := repeat (destruct_one_pair).
(** Destruct one existential package, keeping the name of the hypothesis for the first component. *)
Ltac destruct_one_ex :=
let tac H := let ph := fresh "H" in (destruct H as [H ph]) in
let tacT H := let ph := fresh "X" in (destruct H as [H ph]) in
match goal with
| [H : (ex _) |- _] => tac H
| [H : (sig ?P) |- _ ] => tac H
| [H : (sigT ?P) |- _ ] => tacT H
| [H : (ex2 _) |- _] => tac H
end.
(** Repeateadly destruct existentials. *)
Ltac destruct_exists := repeat (destruct_one_ex).
(** Repeateadly destruct conjunctions and existentials. *)
Ltac destruct_conjs := repeat (destruct_one_pair || destruct_one_ex).
(** Destruct an existential hypothesis [t] keeping its name for the first component
and using [Ht] for the second *)
Tactic Notation "destruct" "exist" ident(t) ident(Ht) := destruct t as [t Ht].
(** Destruct a disjunction keeping its name in both subgoals. *)
Tactic Notation "destruct" "or" ident(H) := destruct H as [H|H].
(** Discriminate that also work on a [x <> x] hypothesis. *)
Ltac discriminates :=
match goal with
| [ H : ?x <> ?x |- _ ] => elim H ; reflexivity
| _ => discriminate
end.
(** Revert the last hypothesis. *)
Ltac revert_last :=
match goal with
[ H : _ |- _ ] => revert H
end.
(** Reapeateadly reverse the last hypothesis, putting everything in the goal. *)
Ltac reverse := repeat revert_last.
(** Clear duplicated hypotheses *)
Ltac clear_dup :=
match goal with
| [ H : ?X |- _ ] =>
match goal with
| [ H' : ?Y |- _ ] =>
match H with
| H' => fail 2
| _ => conv X Y ; (clear H' || clear H)
end
end
end.
Ltac clear_dups := repeat clear_dup.
(** A non-failing subst that substitutes as much as possible. *)
Ltac subst_no_fail :=
repeat (match goal with
[ H : ?X = ?Y |- _ ] => subst X || subst Y
end).
Tactic Notation "subst" "*" := subst_no_fail.
Ltac on_application f tac T :=
match T with
| context [f ?x ?y ?z ?w ?v ?u ?a ?b ?c] => tac (f x y z w v u a b c)
| context [f ?x ?y ?z ?w ?v ?u ?a ?b] => tac (f x y z w v u a b)
| context [f ?x ?y ?z ?w ?v ?u ?a] => tac (f x y z w v u a)
| context [f ?x ?y ?z ?w ?v ?u] => tac (f x y z w v u)
| context [f ?x ?y ?z ?w ?v] => tac (f x y z w v)
| context [f ?x ?y ?z ?w] => tac (f x y z w)
| context [f ?x ?y ?z] => tac (f x y z)
| context [f ?x ?y] => tac (f x y)
| context [f ?x] => tac (f x)
end.
(** Tactical [on_call f tac] applies [tac] on any application of [f] in the hypothesis or goal. *)
Ltac on_call f tac :=
match goal with
| |- ?T => on_application f tac T
| H : ?T |- _ => on_application f tac T
end.
(* Destructs calls to f in hypothesis or conclusion, useful if f creates a subset object. *)
Ltac destruct_call f :=
let tac t := (destruct t) in on_call f tac.
Ltac destruct_calls f := repeat destruct_call f.
Ltac destruct_call_in f H :=
let tac t := (destruct t) in
let T := type of H in
on_application f tac T.
Ltac destruct_call_as f l :=
let tac t := (destruct t as l) in on_call f tac.
Ltac destruct_call_as_in f l H :=
let tac t := (destruct t as l) in
let T := type of H in
on_application f tac T.
Tactic Notation "destruct_call" constr(f) := destruct_call f.
(** Permit to name the results of destructing the call to [f]. *)
Tactic Notation "destruct_call" constr(f) "as" simple_intropattern(l) :=
destruct_call_as f l.
(** Specify the hypothesis in which the call occurs as well. *)
Tactic Notation "destruct_call" constr(f) "in" hyp(id) :=
destruct_call_in f id.
Tactic Notation "destruct_call" constr(f) "as" simple_intropattern(l) "in" hyp(id) :=
destruct_call_as_in f l id.
(** Try to inject any potential constructor equality hypothesis. *)
Ltac autoinjection :=
let tac H := progress (inversion H ; subst ; clear_dups) ; clear H in
match goal with
| [ H : ?f ?a = ?f' ?a' |- _ ] => tac H
end.
Ltac autoinjections := repeat autoinjection.
(** Destruct an hypothesis by first copying it to avoid dependencies. *)
Ltac destruct_nondep H := let H0 := fresh "H" in assert(H0 := H); destruct H0.
(** If bang appears in the goal, it means that we have a proof of False and the goal is solved. *)
Ltac bang :=
match goal with
| |- ?x =>
match x with
| context [False_rect _ ?p] => elim p
end
end.
(** A tactic to show contradiction by first asserting an automatically provable hypothesis. *)
Tactic Notation "contradiction" "by" constr(t) :=
let H := fresh in assert t as H by auto with * ; contradiction.
(** A tactic that adds [H:=p:typeof(p)] to the context if no hypothesis of the same type appears in the goal.
Useful to do saturation using tactics. *)
Ltac add_hypothesis H' p :=
match type of p with
?X =>
match goal with
| [ H : X |- _ ] => fail 1
| _ => set (H':=p) ; try (change p with H') ; clearbody H'
end
end.
(** A tactic to replace an hypothesis by another term. *)
Ltac replace_hyp H c :=
let H' := fresh "H" in
assert(H' := c) ; clear H ; rename H' into H.
(** A tactic to refine an hypothesis by supplying some of its arguments. *)
Ltac refine_hyp c :=
let tac H := replace_hyp H c in
match c with
| ?H _ => tac H
| ?H _ _ => tac H
| ?H _ _ _ => tac H
| ?H _ _ _ _ => tac H
| ?H _ _ _ _ _ => tac H
| ?H _ _ _ _ _ _ => tac H
| ?H _ _ _ _ _ _ _ => tac H
| ?H _ _ _ _ _ _ _ _ => tac H
end.
(** The default simplification tactic used by Program is defined by [program_simpl], sometimes [auto]
is not enough, better rebind using [Obligation Tactic := tac] in this case,
possibly using [program_simplify] to use standard goal-cleaning tactics. *)
Ltac program_simplify :=
simpl ; intros ; destruct_conjs ; simpl proj1_sig in * ; subst* ; autoinjections ; try discriminates ;
try (solve [ red ; intros ; destruct_conjs ; autoinjections ; discriminates ]).
Ltac program_simpl := program_simplify ; auto.
Ltac obligation_tactic := program_simpl.
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