author | wenzelm |
Fri, 05 May 2000 22:09:41 +0200 | |
changeset 8807 | 0046be1769f9 |
parent 7731 | 51d59734743d |
child 14981 | e73f8140af78 |
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: $Id$ |
77071ac7c7b5
Histories of proof states, with undo / redo and prev / back.
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Author: Markus Wenzel, TU Muenchen |
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License: GPL (GNU GENERAL PUBLIC LICENSE) |
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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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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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Histories of proof states, with undo / redo and prev / back.
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signature PROOF_HISTORY = |
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Histories of proof states, with undo / redo and prev / back.
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sig |
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Histories of proof states, with undo / redo and prev / back.
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type T |
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exception FAIL of string |
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val position: T -> int |
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val init: int option -> Proof.state -> T |
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val is_initial: T -> bool |
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val current: T -> Proof.state |
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val clear: int -> T -> T |
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Histories of proof states, with undo / redo and prev / back.
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val undo: T -> T |
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val redo: T -> T |
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val back: bool -> T -> T |
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val applys: (Proof.state -> Proof.state Seq.seq) -> T -> T |
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val apply: (Proof.state -> Proof.state) -> T -> T |
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end; |
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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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structure ProofHistory: PROOF_HISTORY = |
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struct |
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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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(* datatype proof history *) |
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Histories of proof states, with undo / redo and prev / back.
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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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type proof = node * node list; |
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datatype T = ProofHistory of proof History.T; |
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Histories of proof states, with undo / redo and prev / back.
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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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fun position (ProofHistory prf) = length (snd (History.current prf)); |
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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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(* generic history operations *) |
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fun init lim st = ProofHistory (History.init lim ((st, Seq.empty), [])); |
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fun is_initial (ProofHistory prf) = History.is_initial prf; |
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fun current (ProofHistory prf) = fst (fst (History.current prf)); |
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val clear = app o History.clear; |
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Histories of proof states, with undo / redo and prev / back.
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val undo = app History.undo; |
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val redo = app History.redo; |
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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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(* backtrack *) |
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fun back_fun recur ((_, stq), nodes) = |
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(case Seq.pull stq of |
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None => |
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if recur andalso not (null nodes) then |
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(writeln "back: trying previous proof state ..."; back_fun recur (hd nodes, tl nodes)) |
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else raise FAIL "back: no alternatives" |
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| Some result => (result, nodes)); |
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Histories of proof states, with undo / redo and prev / back.
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val back = hist_app o back_fun; |
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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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(* apply transformer *) |
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fun applys f = hist_app (fn (node as (st, _), nodes) => |
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(case Seq.pull (f st) of |
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None => raise FAIL "empty result sequence -- proof command failed" |
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| Some results => (results, node :: nodes))); |
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Histories of proof states, with undo / redo and prev / back.
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fun apply f = applys (Seq.single o f); |
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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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end; |