wenzelm@6888: (*  Title:      Pure/Isar/skip_proof.ML
wenzelm@6888:     ID:         $Id$
wenzelm@6888:     Author:     Markus Wenzel, TU Muenchen
wenzelm@8807:     License:    GPL (GNU GENERAL PUBLIC LICENSE)
wenzelm@6888: 
wenzelm@8539: Skipping proofs -- quick_and_dirty mode.
wenzelm@6888: *)
wenzelm@6888: 
wenzelm@6888: signature SKIP_PROOF =
wenzelm@6888: sig
wenzelm@8539:   val quick_and_dirty: bool ref
wenzelm@11892:   val make_thm: theory -> term -> thm
wenzelm@11892:   val cheat_tac: theory -> tactic
wenzelm@6984:   val local_skip_proof: ({kind: string, name: string, thm: thm} -> unit) * (thm -> unit)
wenzelm@6888:     -> Proof.state -> Proof.state Seq.seq
wenzelm@6888:   val global_skip_proof: Proof.state -> theory * {kind: string, name: string, thm: thm}
wenzelm@6888:   val setup: (theory -> theory) list
wenzelm@6888: end;
wenzelm@6888: 
wenzelm@6888: structure SkipProof: SKIP_PROOF =
wenzelm@6888: struct
wenzelm@6888: 
wenzelm@6888: 
wenzelm@8539: (* quick_and_dirty *)
wenzelm@8539: 
wenzelm@8539: (*if true then some packages will OMIT SOME PROOFS*)
wenzelm@8539: val quick_and_dirty = ref false;
wenzelm@8539: 
wenzelm@8539: 
wenzelm@11892: (* oracle setup *)
wenzelm@6888: 
wenzelm@6888: val skip_proofN = "skip_proof";
wenzelm@6888: 
wenzelm@11892: exception SkipProof of term;
wenzelm@6888: 
wenzelm@11892: fun skip_proof (_, SkipProof t) =
wenzelm@11892:   if ! quick_and_dirty then t
wenzelm@6888:   else error "Proofs may be skipped in quick_and_dirty mode only!";
wenzelm@6888: 
wenzelm@11892: val setup = [Theory.add_oracle (skip_proofN, skip_proof)];
wenzelm@6888: 
wenzelm@11892: 
wenzelm@11892: (* make_thm and cheat_tac *)
wenzelm@11892: 
wenzelm@11892: fun make_thm thy t =
wenzelm@11892:   (*dynamic scoping of the oracle, cannot even qualify the name due to Pure/CPure!*)
wenzelm@11892:   Thm.invoke_oracle thy skip_proofN (Theory.sign_of thy, SkipProof t);
wenzelm@11892: 
wenzelm@8539: fun cheat_tac thy st =
wenzelm@11892:   ALLGOALS (Tactic.rtac (make_thm thy (Var (("A", 0), propT)))) st;
wenzelm@6888: 
wenzelm@6888: 
wenzelm@8539: (* "sorry" proof command *)
wenzelm@8539: 
wenzelm@8539: fun cheating ctxt = Method.METHOD (K (cheat_tac (ProofContext.theory_of ctxt)));
wenzelm@8539: 
wenzelm@8539: val local_skip_proof = Method.local_terminal_proof (Method.Basic cheating, None);
wenzelm@8539: val global_skip_proof = Method.global_terminal_proof (Method.Basic cheating, None);
wenzelm@8539: 
wenzelm@6888: end;
wenzelm@8539: 
wenzelm@8539: 
wenzelm@8539: val quick_and_dirty = SkipProof.quick_and_dirty;