diff options
| author | aspiwack | 2013-11-02 15:38:41 +0000 |
|---|---|---|
| committer | aspiwack | 2013-11-02 15:38:41 +0000 |
| commit | af63420fe7202f01b483812bc1f5ff50c5a640e2 (patch) | |
| tree | eb124c5a451cb55a3080093994b14a8960251a68 /proofs | |
| parent | a9cfc4691726ac248dc7bbc43bb5ae8a7db3233f (diff) | |
Adds a tactical once.
[once t] does just as [t] but has exactly one success it [t] has at least one success.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@17004 85f007b7-540e-0410-9357-904b9bb8a0f7
Diffstat (limited to 'proofs')
| -rw-r--r-- | proofs/proofview.ml | 9 | ||||
| -rw-r--r-- | proofs/proofview.mli | 4 |
2 files changed, 13 insertions, 0 deletions
diff --git a/proofs/proofview.ml b/proofs/proofview.ml index 8a3511651f..167fedf7b7 100644 --- a/proofs/proofview.ml +++ b/proofs/proofview.ml @@ -244,6 +244,15 @@ let tclIFCATCH a s f = | Util.Inr e -> f e | Util.Inl (x,a') -> Proof.plus (s x) (fun e -> (a' e) >>= fun x' -> (s x')) +(* [tclONCE t] fails if [t] fails, otherwise it has exactly one + success. *) +let tclONCE t = + (* spiwack: convenience notations, waiting for ocaml 3.12 *) + let (>>=) = Proof.bind in + Proof.split t >>= function + | Util.Inr e -> tclZERO e + | Util.Inl (x,_) -> tclUNIT x + (* Focuses a tactic at a range of subgoals, found by their indices. *) (* arnaud: bug if 0 goals ! *) let tclFOCUS i j t = diff --git a/proofs/proofview.mli b/proofs/proofview.mli index 207df891e4..c9296e694f 100644 --- a/proofs/proofview.mli +++ b/proofs/proofview.mli @@ -156,6 +156,10 @@ val tclORELSE : 'a tactic -> (exn -> 'a tactic) -> 'a tactic fails with [e], then it behaves as [f e]. *) val tclIFCATCH : 'a tactic -> ('a -> 'b tactic) -> (exn -> 'b tactic) -> 'b tactic +(* [tclONCE t] fails if [t] fails, otherwise it has exactly one + success. *) +val tclONCE : 'a tactic -> 'a tactic + (* Focuses a tactic at a range of subgoals, found by their indices. *) val tclFOCUS : int -> int -> 'a tactic -> 'a tactic |