author | wenzelm |
Wed, 17 Mar 1999 13:39:44 +0100 | |
changeset 6374 | a67e4729efb2 |
parent 5944 | dcc446da8e19 |
child 6684 | 4f859545bd92 |
permissions | -rw-r--r-- |
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Histories of proof states, with undo / redo and prev / back.
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(* Title: Pure/Isar/proof_history.ML |
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Histories of proof states, with undo / redo and prev / back.
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ID: $Id$ |
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Histories of proof states, with undo / redo and prev / back.
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Author: Markus Wenzel, TU Muenchen |
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Histories of proof states, with undo / redo and prev / back.
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Histories of proof states, with undo / redo and prev / back. |
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Histories of proof states, with undo / redo and prev / back.
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*) |
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Histories of proof states, with undo / redo and prev / back.
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signature PROOF_HISTORY = |
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sig |
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type T |
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exception FAIL of string |
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val init: Proof.state -> T |
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val current: T -> Proof.state |
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val clear: T -> T |
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val undo: T -> T |
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val redo: T -> T |
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val undos: int -> T -> T |
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val redos: int -> T -> T |
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val position: T -> int |
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val nesting: T -> int |
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val prev: T -> T |
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val up: T -> T |
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val top: T -> T |
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val back: T -> T |
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val applys: (Proof.state -> Proof.state Seq.seq) -> T -> T |
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val applys_open: (Proof.state -> Proof.state Seq.seq) -> T -> T |
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val applys_close: (Proof.state -> Proof.state Seq.seq) -> T -> T |
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val apply: (Proof.state -> Proof.state) -> T -> T |
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val apply_open: (Proof.state -> Proof.state) -> T -> T |
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val apply_close: (Proof.state -> Proof.state) -> T -> T |
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val apply_cond_open: bool -> (Proof.state -> Proof.state) -> T -> T |
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end; |
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structure ProofHistory: PROOF_HISTORY = |
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struct |
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(* datatype proof history *) |
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type node = |
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(Proof.state * (*first result*) |
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Proof.state Seq.seq) * (*alternative results*) |
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int; (*nest level*) |
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type proof = node * node list; |
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datatype T = ProofHistory of proof History.T; |
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exception FAIL of string; |
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fun app f (ProofHistory x) = ProofHistory (f x); |
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fun hist_app f = app (History.apply f); |
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(* generic history operations *) |
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fun init st = ProofHistory (History.init (((st, Seq.empty), 0), [])); |
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fun current (ProofHistory prf) = fst (fst (fst (History.current prf))); |
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val clear = app History.clear; |
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val undo = app History.undo; |
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val redo = app History.redo; |
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fun undos n = funpow n undo; |
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fun redos n = funpow n redo; |
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(* navigate *) |
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fun position (ProofHistory prf) = length (snd (History.current prf)); |
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fun nesting (ProofHistory prf) = snd (fst (History.current prf)); |
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fun prev_until msg _ (_, []) = raise FAIL msg |
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| prev_until msg pred (_, node :: nodes) = |
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if pred node then (node, nodes) |
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else prev_until msg pred (node, nodes); |
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val prev = hist_app (prev_until "no previous proof state" (K true)); |
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fun up prf = hist_app (prev_until "no upper proof state" (fn (_, m) => m < nesting prf)) prf; |
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val top = hist_app (fn (node, nodes) => (last_elem (node :: nodes), [])); |
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(* backtrack *) |
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fun back_fun (((_, stq), n), nodes) = |
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(case Seq.pull stq of |
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None => |
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(case nodes of |
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[] => raise FAIL "back: no alternatives" |
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| nd :: nds => (writeln "back: trying previous proof state ..."; back_fun (nd, nds))) |
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| Some result => ((result, n), nodes)); |
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val back = hist_app back_fun; |
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(* apply transformer *) |
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fun gen_apply d f (node as ((st, _), n): node, nodes) = |
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(case Seq.pull (f st) of |
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None => raise FAIL "empty result sequence -- command failed" |
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| Some results => ((results, n + d), node :: nodes)); |
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val applys = hist_app o gen_apply 0; |
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val applys_open = hist_app o gen_apply 1; |
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val applys_close = hist_app o gen_apply ~1; |
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fun apply f = applys (Seq.single o f); |
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fun apply_open f = applys_open (Seq.single o f); |
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fun apply_close f = applys_close (Seq.single o f); |
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fun apply_cond_open do_open f = if do_open then apply_open f else apply f; |
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end; |