author | blanchet |
Mon, 06 Jun 2011 20:56:06 +0200 | |
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(* Title: HOL/Tools/Metis/metis_tactics.ML |
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Author: Kong W. Susanto, Cambridge University Computer Laboratory |
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Author: Lawrence C. Paulson, Cambridge University Computer Laboratory |
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Author: Jasmin Blanchette, TU Muenchen |
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The Metis prover (slightly modified version from Larry);
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Copyright Cambridge University 2007 |
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HOL setup for the Metis prover. |
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*) |
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signature METIS_TACTICS = |
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sig |
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val metisN : string |
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val metisFT_N : string |
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val default_unsound_type_sys : string |
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val default_sound_type_sys : string |
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val trace : bool Config.T |
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val verbose : bool Config.T |
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val new_skolemizer : bool Config.T |
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val metis_tac : string list -> Proof.context -> thm list -> int -> tactic |
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val metisFT_tac : Proof.context -> thm list -> int -> tactic |
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val setup : theory -> theory |
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end |
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structure Metis_Tactics : METIS_TACTICS = |
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struct |
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open ATP_Translate |
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open Metis_Translate |
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open Metis_Reconstruct |
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val metisN = Binding.qualified_name_of @{binding metis} |
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val metisFT_N = Binding.qualified_name_of @{binding metisFT} |
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val full_typesN = "full_types" |
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val default_unsound_type_sys = "poly_args" |
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val default_sound_type_sys = "poly_preds_heavy_query" |
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||
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fun method_call_for_type_sys type_sys = |
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if type_sys = default_sound_type_sys then |
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(@{binding metisFT}, "") |
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else |
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(@{binding metis}, |
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if type_sys = default_unsound_type_sys then "" else type_sys) |
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val new_skolemizer = |
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Attrib.setup_config_bool @{binding metis_new_skolemizer} (K false) |
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(* Designed to work also with monomorphic instances of polymorphic theorems. *) |
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fun have_common_thm ths1 ths2 = |
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exists (member (untyped_aconv o pairself prop_of) ths1) |
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(map Meson.make_meta_clause ths2) |
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(*Determining which axiom clauses are actually used*) |
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fun used_axioms axioms (th, Metis_Proof.Axiom _) = SOME (lookth axioms th) |
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| used_axioms _ _ = NONE |
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(* Lightweight predicate type information comes in two flavors, "t = t'" and |
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"t => t'", where "t" and "t'" are the same term modulo type tags. |
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In Isabelle, type tags are stripped away, so we are left with "t = t" or |
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"t => t". Type tag idempotence is also handled this way. *) |
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fun reflexive_or_trivial_from_metis ctxt sym_tab old_skolems mth = |
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let val thy = Proof_Context.theory_of ctxt in |
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case hol_clause_from_metis ctxt sym_tab old_skolems mth of |
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Const (@{const_name HOL.eq}, _) $ _ $ t => |
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t |> cterm_of thy |> Thm.reflexive RS @{thm meta_eq_to_obj_eq} |
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| Const (@{const_name disj}, _) $ t1 $ t2 => |
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(if can HOLogic.dest_not t1 then t2 else t1) |
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|> HOLogic.mk_Trueprop |> cterm_of thy |> Thm.trivial |
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| _ => raise Fail "unexpected tags sym clause" |
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end |
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|> Meson.make_meta_clause |
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val clause_params = |
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{ordering = Metis_KnuthBendixOrder.default, |
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orderLiterals = Metis_Clause.UnsignedLiteralOrder, |
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orderTerms = true} |
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val active_params = |
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{clause = clause_params, |
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prefactor = #prefactor Metis_Active.default, |
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postfactor = #postfactor Metis_Active.default} |
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val waiting_params = |
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{symbolsWeight = 1.0, |
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variablesWeight = 0.0, |
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literalsWeight = 0.0, |
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models = []} |
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val resolution_params = {active = active_params, waiting = waiting_params} |
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(* Main function to start Metis proof and reconstruction *) |
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fun FOL_SOLVE (type_sys :: fallback_type_syss) ctxt cls ths0 = |
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let val thy = Proof_Context.theory_of ctxt |
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val new_skolemizer = |
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Config.get ctxt new_skolemizer orelse null (Meson.choice_theorems thy) |
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val th_cls_pairs = |
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map2 (fn j => fn th => |
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(Thm.get_name_hint th, |
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Meson_Clausify.cnf_axiom ctxt new_skolemizer j th)) |
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(0 upto length ths0 - 1) ths0 |
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val ths = maps (snd o snd) th_cls_pairs |
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val dischargers = map (fst o snd) th_cls_pairs |
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val _ = trace_msg ctxt (fn () => "FOL_SOLVE: CONJECTURE CLAUSES") |
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val _ = app (fn th => trace_msg ctxt (fn () => Display.string_of_thm ctxt th)) cls |
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val _ = trace_msg ctxt (fn () => "THEOREM CLAUSES") |
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val _ = app (fn th => trace_msg ctxt (fn () => Display.string_of_thm ctxt th)) ths |
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val (sym_tab, axioms, old_skolems) = |
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prepare_metis_problem ctxt type_sys cls ths |
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fun get_isa_thm mth Isa_Reflexive_or_Trivial = |
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reflexive_or_trivial_from_metis ctxt sym_tab old_skolems mth |
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| get_isa_thm _ (Isa_Raw ith) = ith |
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val axioms = axioms |> map (fn (mth, ith) => (mth, get_isa_thm mth ith)) |
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val _ = trace_msg ctxt (fn () => "CLAUSES GIVEN TO METIS") |
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val thms = axioms |> map fst |
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val _ = app (fn th => trace_msg ctxt (fn () => Metis_Thm.toString th)) thms |
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val _ = trace_msg ctxt (fn () => "type_sys = " ^ type_sys) |
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val _ = trace_msg ctxt (fn () => "START METIS PROVE PROCESS") |
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in |
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case filter (fn t => prop_of t aconv @{prop False}) cls of |
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false_th :: _ => [false_th RS @{thm FalseE}] |
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| [] => |
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case Metis_Resolution.new resolution_params {axioms = thms, conjecture = []} |
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|> Metis_Resolution.loop of |
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Metis_Resolution.Contradiction mth => |
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let val _ = trace_msg ctxt (fn () => "METIS RECONSTRUCTION START: " ^ |
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Metis_Thm.toString mth) |
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val ctxt' = fold Variable.declare_constraints (map prop_of cls) ctxt |
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(*add constraints arising from converting goal to clause form*) |
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val proof = Metis_Proof.proof mth |
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val result = |
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axioms |
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|> fold (replay_one_inference ctxt' old_skolems sym_tab) proof |
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val used = map_filter (used_axioms axioms) proof |
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val _ = trace_msg ctxt (fn () => "METIS COMPLETED...clauses actually used:") |
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val _ = app (fn th => trace_msg ctxt (fn () => Display.string_of_thm ctxt th)) used |
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val names = th_cls_pairs |> map fst |
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val used_names = |
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th_cls_pairs |
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|> map_filter (fn (name, (_, cls)) => |
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if have_common_thm used cls then SOME name |
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else NONE) |
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val unused_names = names |> subtract (op =) used_names |
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in |
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if not (null cls) andalso not (have_common_thm used cls) then |
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verbose_warning ctxt "The assumptions are inconsistent" |
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else |
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(); |
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if not (null unused_names) then |
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"Unused theorems: " ^ commas_quote unused_names |
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|> verbose_warning ctxt |
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else |
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(); |
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case result of |
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(_,ith)::_ => |
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152 |
(trace_msg ctxt (fn () => "Success: " ^ Display.string_of_thm ctxt ith); |
39887
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second step in introducing the new Skolemizer -- notably, added procedure for discharging Skolem assumptions
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153 |
[discharge_skolem_premises ctxt dischargers ith]) |
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154 |
| _ => (trace_msg ctxt (fn () => "Metis: No result"); []) |
32956 | 155 |
end |
39419
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156 |
| Metis_Resolution.Satisfiable _ => |
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157 |
(trace_msg ctxt (fn () => "Metis: No first-order proof with the lemmas supplied"); |
43212 | 158 |
if null fallback_type_syss then |
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159 |
() |
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160 |
else |
42650
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reintroduce this idea of running "metisFT" after a failed "metis" -- I took it out in e85ce10cef1a because I couldn't think of a reasonable use case, but now that ATPs use sound encodings and include dangerous facts (e.g. True_or_False) it makes more sense than ever to run "metisFT" after "metis"
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161 |
raise METIS ("FOL_SOLVE", |
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162 |
"No first-order proof with the lemmas supplied"); |
38097
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revert exception throwing in FOL_SOLVE, since they're not caught anyway
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163 |
[]) |
42733
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164 |
end |
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165 |
handle METIS (loc, msg) => |
43212 | 166 |
case fallback_type_syss of |
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167 |
[] => error ("Failed to replay Metis proof in Isabelle." ^ |
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168 |
(if Config.get ctxt verbose then "\n" ^ loc ^ ": " ^ msg |
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169 |
else "")) |
43212 | 170 |
| type_sys :: _ => |
171 |
let val (binding, arg) = method_call_for_type_sys type_sys in |
|
43205 | 172 |
(verbose_warning ctxt |
173 |
("Falling back on " ^ |
|
174 |
quote (Binding.qualified_name_of binding ^ |
|
175 |
(arg |> arg <> "" ? enclose " (" ")")) ^ "..."); |
|
43212 | 176 |
FOL_SOLVE fallback_type_syss ctxt cls ths0) |
43205 | 177 |
end |
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178 |
|
42847 | 179 |
val neg_clausify = |
38028 | 180 |
single |
181 |
#> Meson.make_clauses_unsorted |
|
39890 | 182 |
#> map Meson_Clausify.introduce_combinators_in_theorem |
38028 | 183 |
#> Meson.finish_cnf |
184 |
||
39269
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185 |
fun preskolem_tac ctxt st0 = |
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186 |
(if exists (Meson.has_too_many_clauses ctxt) |
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187 |
(Logic.prems_of_goal (prop_of st0) 1) then |
42336
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188 |
Simplifier.full_simp_tac (Meson_Clausify.ss_only @{thms not_all not_ex}) 1 |
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189 |
THEN cnf.cnfx_rewrite_tac ctxt 1 |
39269
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190 |
else |
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191 |
all_tac) st0 |
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192 |
|
38652
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perform eta-expansion of quantifier bodies in Sledgehammer translation when needed + transform elim rules later;
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193 |
val type_has_top_sort = |
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exists_subtype (fn TFree (_, []) => true | TVar (_, []) => true | _ => false) |
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195 |
|
43212 | 196 |
fun generic_metis_tac type_syss ctxt ths i st0 = |
37926
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197 |
let |
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198 |
val _ = trace_msg ctxt (fn () => |
43194 | 199 |
"Metis called with theorems\n" ^ |
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200 |
cat_lines (map (Display.string_of_thm ctxt) ths)) |
43212 | 201 |
fun tac clause = resolve_tac (FOL_SOLVE type_syss ctxt clause ths) 1 |
32956 | 202 |
in |
37626
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203 |
if exists_type type_has_top_sort (prop_of st0) then |
42650
552eae49f97d
reintroduce this idea of running "metisFT" after a failed "metis" -- I took it out in e85ce10cef1a because I couldn't think of a reasonable use case, but now that ATPs use sound encodings and include dangerous facts (e.g. True_or_False) it makes more sense than ever to run "metisFT" after "metis"
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|
204 |
(verbose_warning ctxt "Proof state contains the universal sort {}"; |
40665
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added "verbose" option to Metis to shut up its warnings if necessary
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205 |
Seq.empty) |
35568
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|
206 |
else |
43100 | 207 |
Meson.MESON (preskolem_tac ctxt) (maps neg_clausify) tac ctxt i st0 |
32956 | 208 |
end |
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The Metis prover (slightly modified version from Larry);
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|
209 |
|
43212 | 210 |
val metis_default_type_syss = [default_unsound_type_sys, default_sound_type_sys] |
211 |
val metisFT_type_syss = [default_sound_type_sys] |
|
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212 |
|
43212 | 213 |
fun metis_tac [] = generic_metis_tac metis_default_type_syss |
214 |
| metis_tac type_syss = generic_metis_tac type_syss |
|
215 |
val metisFT_tac = generic_metis_tac metisFT_type_syss |
|
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parents:
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changeset
|
216 |
|
38632
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treat "using X by metis" (more or less) the same as "by (metis X)"
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|
217 |
(* Whenever "X" has schematic type variables, we treat "using X by metis" as |
43100 | 218 |
"by (metis X)" to prevent "Subgoal.FOCUS" from freezing the type variables. |
38632
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|
219 |
We don't do it for nonschematic facts "X" because this breaks a few proofs |
9cde57cdd0e3
treat "using X by metis" (more or less) the same as "by (metis X)"
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|
220 |
(in the rare and subtle case where a proof relied on extensionality not being |
38994 | 221 |
applied) and brings few benefits. *) |
38632
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|
222 |
val has_tvar = |
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|
223 |
exists_type (exists_subtype (fn TVar _ => true | _ => false)) o prop_of |
43034
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|
224 |
|
43212 | 225 |
fun method type_syss (type_sys, ths) ctxt facts = |
43100 | 226 |
let |
227 |
val (schem_facts, nonschem_facts) = List.partition has_tvar facts |
|
43212 | 228 |
val type_syss = type_sys |> Option.map single |> the_default type_syss |
43100 | 229 |
in |
43099 | 230 |
HEADGOAL (Method.insert_tac nonschem_facts THEN' |
43212 | 231 |
CHANGED_PROP |
232 |
o generic_metis_tac type_syss ctxt (schem_facts @ ths)) |
|
43099 | 233 |
end |
43100 | 234 |
|
43212 | 235 |
fun setup_method (type_syss as type_sys :: _) = |
236 |
(if type_syss = metis_default_type_syss then |
|
43205 | 237 |
(Args.parens Parse.short_ident |
238 |
>> (fn s => if s = full_typesN then default_sound_type_sys else s)) |
|
239 |
|> Scan.option |> Scan.lift |
|
240 |
else |
|
241 |
Scan.succeed NONE) |
|
43212 | 242 |
-- Attrib.thms >> (METHOD oo method type_syss) |
243 |
|> Method.setup (fst (method_call_for_type_sys type_sys)) |
|
23442
028e39e5e8f3
The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff
changeset
|
244 |
|
32956 | 245 |
val setup = |
43212 | 246 |
[(metis_default_type_syss, "Metis for FOL and HOL problems"), |
247 |
(metisFT_type_syss, |
|
248 |
"Metis for FOL/HOL problems with fully-typed translation")] |
|
43034
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249 |
|> fold (uncurry setup_method) |
23442
028e39e5e8f3
The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff
changeset
|
250 |
|
028e39e5e8f3
The Metis prover (slightly modified version from Larry);
wenzelm
parents:
diff
changeset
|
251 |
end; |