author | wenzelm |
Sat, 14 Jan 2006 17:14:06 +0100 | |
changeset 18678 | dd0c569fa43d |
parent 18670 | c3f445b92aff |
child 18693 | 8ae076ee5e19 |
permissions | -rw-r--r-- |
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The 'obtain' language element -- achieves (eliminated) existential
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(* Title: Pure/Isar/obtain.ML |
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The 'obtain' language element -- achieves (eliminated) existential
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ID: $Id$ |
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The 'obtain' language element -- achieves (eliminated) existential
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Author: Markus Wenzel, TU Muenchen |
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The 'obtain' language element -- achieves (eliminated) existential
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The 'obtain' and 'guess' language elements -- generalized existence at |
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the level of proof texts: 'obtain' involves a proof that certain |
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fixes/assumes may be introduced into the present context; 'guess' is |
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similar, but derives these elements from the course of reasoning! |
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<chain_facts> |
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obtain x where "P x" <proof> == |
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have "!!thesis. (!!x. P x ==> thesis) ==> thesis" |
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proof succeed |
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fix thesis |
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assume that [intro?]: "!!x. P x ==> thesis" |
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<chain_facts> show thesis <proof (insert that)> |
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qed |
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fix x assm (obtained) "P x" |
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<chain_facts> |
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guess x <proof body> <proof end> == |
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{ |
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fix thesis |
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<chain_facts> have "PROP ?guess" |
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apply magic -- {* turns goal into "thesis ==> Goal thesis" *} |
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<proof body> |
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apply_end magic -- {* turns final "(!!x. P x ==> thesis) ==> Goal thesis" into |
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"Goal ((!!x. P x ==> thesis) ==> thesis)" which is a finished goal state *} |
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<proof end> |
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} |
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fix x assm (obtained) "P x" |
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*) |
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signature OBTAIN = |
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sig |
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val obtain: (string * string option) list -> |
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((string * Attrib.src list) * (string * (string list * string list)) list) list |
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-> bool -> Proof.state -> Proof.state |
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val obtain_i: (string * typ option) list -> |
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((string * Proof.context attribute list) * (term * (term list * term list)) list) list |
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-> bool -> Proof.state -> Proof.state |
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val guess: (string * string option) list -> bool -> Proof.state -> Proof.state |
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val guess_i: (string * typ option) list -> bool -> Proof.state -> Proof.state |
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end; |
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structure Obtain: OBTAIN = |
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struct |
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(** obtain_export **) |
54 |
||
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fun obtain_export ctxt parms rule cprops thm = |
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let |
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val {thy, prop, maxidx, ...} = Thm.rep_thm thm; |
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val cparms = map (Thm.cterm_of thy) parms; |
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val thm' = thm |
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|> Drule.implies_intr_protected cprops |
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|> Drule.forall_intr_list cparms |
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|> Drule.forall_elim_vars (maxidx + 1); |
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val elim_tacs = replicate (length cprops) (Tactic.etac Drule.protectI); |
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val concl = Logic.strip_assums_concl prop; |
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val bads = parms inter (Term.term_frees concl); |
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in |
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if not (null bads) then |
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error ("Conclusion contains obtained parameters: " ^ |
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space_implode " " (map (ProofContext.string_of_term ctxt) bads)) |
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else if not (ObjectLogic.is_judgment thy concl) then |
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error "Conclusion in obtained context must be object-logic judgments" |
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else (Tactic.rtac thm' THEN' RANGE elim_tacs) 1 rule |
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end; |
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||
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||
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(** obtain **) |
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fun bind_judgment ctxt name = |
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let |
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val (bind, _) = ProofContext.bind_fixes [name] ctxt; |
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val (t as _ $ Free v) = bind (ObjectLogic.fixed_judgment (ProofContext.theory_of ctxt) name); |
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in (v, t) end; |
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local |
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val thatN = "that"; |
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fun gen_obtain prep_att prep_vars prep_propp raw_vars raw_asms int state = |
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let |
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val _ = Proof.assert_forward_or_chain state; |
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val ctxt = Proof.context_of state; |
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val thy = Proof.theory_of state; |
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val chain_facts = if can Proof.assert_chain state then Proof.the_facts state else []; |
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(*obtain vars*) |
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val (vars, vars_ctxt) = prep_vars (map Syntax.no_syn raw_vars) ctxt; |
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val (_, fix_ctxt) = vars_ctxt |> ProofContext.add_fixes_i vars; |
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val xs = map #1 vars; |
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val Ts = map #2 vars; |
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(*obtain asms*) |
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val (asms_ctxt, proppss) = prep_propp (fix_ctxt, map snd raw_asms); |
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val asm_props = List.concat (map (map fst) proppss); |
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val asms = map fst (Attrib.map_specs (prep_att thy) raw_asms) ~~ proppss; |
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val _ = ProofContext.warn_extra_tfrees fix_ctxt asms_ctxt; |
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(*obtain statements*) |
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val thesisN = Term.variant xs AutoBind.thesisN; |
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val (thesis_var, thesis) = bind_judgment fix_ctxt thesisN; |
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fun occs_var x = Library.get_first (fn t => |
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Term.find_free t (ProofContext.get_skolem fix_ctxt x)) asm_props; |
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val raw_parms = map occs_var xs; |
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val parms = List.mapPartial I raw_parms; |
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val parm_names = |
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List.mapPartial (fn (SOME (Free a), x) => SOME (a, x) | _ => NONE) (raw_parms ~~ xs); |
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val that_prop = |
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Term.list_all_free (map #1 parm_names, Logic.list_implies (asm_props, thesis)) |
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|> Library.curry Logic.list_rename_params (map #2 parm_names); |
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val obtain_prop = |
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Logic.list_rename_params ([AutoBind.thesisN], |
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Term.list_all_free ([thesis_var], Logic.mk_implies (that_prop, thesis))); |
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fun after_qed _ = |
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Proof.local_qed (NONE, false) |
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#> Seq.map (`Proof.the_fact #-> (fn rule => |
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Proof.fix_i (xs ~~ Ts) |
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#> Proof.assm_i (K (obtain_export ctxt parms rule)) asms)); |
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in |
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state |
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|> Proof.enter_forward |
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|> Proof.have_i NONE (K Seq.single) [(("", []), [(obtain_prop, ([], []))])] int |
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|> Proof.proof (SOME Method.succeed_text) |> Seq.hd |
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|> Proof.fix_i [(thesisN, NONE)] |
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|> Proof.assume_i |
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[((thatN, [Attrib.context (ContextRules.intro_query NONE)]), [(that_prop, ([], []))])] |
|
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|> `Proof.the_facts |
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||> Proof.chain_facts chain_facts |
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||> Proof.show_i NONE after_qed [(("", []), [(thesis, ([], []))])] false |
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|-> (Proof.refine o Method.Basic o K o Method.insert) |> Seq.hd |
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end; |
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in |
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val obtain = gen_obtain Attrib.local_attribute ProofContext.read_vars ProofContext.read_propp; |
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val obtain_i = gen_obtain (K I) ProofContext.cert_vars ProofContext.cert_propp; |
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end; |
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(** guess **) |
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local |
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fun match_params ctxt vars rule = |
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let |
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val thy = ProofContext.theory_of ctxt; |
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val string_of_typ = ProofContext.string_of_typ ctxt; |
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val string_of_term = setmp show_types true (ProofContext.string_of_term ctxt); |
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fun err msg th = error (msg ^ ":\n" ^ ProofContext.string_of_thm ctxt th); |
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val params = RuleCases.strip_params (Logic.nth_prem (1, Thm.prop_of rule)); |
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val m = length vars; |
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val n = length params; |
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val _ = conditional (m > n) |
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(fn () => err "More variables than parameters in obtained rule" rule); |
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fun match ((x, SOME T), (y, U)) tyenv = |
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((x, T), Sign.typ_match thy (U, T) tyenv handle Type.TYPE_MATCH => |
17891 | 177 |
err ("Failed to match variable " ^ |
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string_of_term (Free (x, T)) ^ " against parameter " ^ |
17891 | 179 |
string_of_term (Syntax.mark_boundT (y, Envir.norm_type tyenv U)) ^ " in") rule) |
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| match ((x, NONE), (_, U)) tyenv = ((x, U), tyenv); |
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val (xs, tyenv) = fold_map match (vars ~~ Library.take (m, params)) Vartab.empty; |
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val ys = Library.drop (m, params); |
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val norm_type = Envir.norm_type tyenv; |
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val xs' = xs |> map (apsnd norm_type); |
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val ys' = |
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map Syntax.internal (Term.variantlist (map fst ys, map fst xs)) ~~ |
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map (norm_type o snd) ys; |
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val instT = |
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fold (Term.add_tvarsT o #2) params [] |
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|> map (TVar #> (fn T => (Thm.ctyp_of thy T, Thm.ctyp_of thy (norm_type T)))); |
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val rule' = rule |> Thm.instantiate (instT, []); |
17891 | 193 |
|
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val tvars = Drule.tvars_of rule'; |
|
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val vars = fold (remove op =) (Term.add_vars (Thm.concl_of rule') []) (Drule.vars_of rule'); |
|
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val _ = |
|
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if null tvars andalso null vars then () |
|
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else err ("Illegal schematic variable(s) " ^ |
|
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commas (map (string_of_typ o TVar) tvars @ map (string_of_term o Var) vars) ^ " in") rule'; |
|
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in (xs' @ ys', rule') end; |
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201 |
|
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202 |
fun gen_guess prep_vars raw_vars int state = |
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203 |
let |
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204 |
val _ = Proof.assert_forward_or_chain state; |
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205 |
val thy = Proof.theory_of state; |
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206 |
val ctxt = Proof.context_of state; |
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207 |
val chain_facts = if can Proof.assert_chain state then Proof.the_facts state else []; |
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208 |
|
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209 |
val (thesis_var, thesis) = bind_judgment ctxt AutoBind.thesisN; |
18670 | 210 |
val (vars, _) = prep_vars (map Syntax.no_syn raw_vars) ctxt; |
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211 |
|
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fun check_result th = |
213 |
(case Thm.prems_of th of |
|
214 |
[prem] => |
|
215 |
if Thm.concl_of th aconv thesis andalso |
|
216 |
Logic.strip_assums_concl prem aconv thesis then () |
|
18678 | 217 |
else error ("Guessed a different clause:\n" ^ ProofContext.string_of_thm ctxt th) |
218 |
| [] => error "Goal solved -- nothing guessed." |
|
219 |
| _ => error ("Guess split into several cases:\n" ^ ProofContext.string_of_thm ctxt th)); |
|
17891 | 220 |
|
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221 |
fun guess_context raw_rule = |
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222 |
let |
18678 | 223 |
val (parms, rule) = match_params ctxt (map (fn (x, T, _) => (x, T)) vars) raw_rule; |
18670 | 224 |
val (bind, _) = ProofContext.bind_fixes (map #1 parms) ctxt; |
225 |
val ts = map (bind o Free) parms; |
|
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val ps = map dest_Free ts; |
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val asms = |
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Logic.strip_assums_hyp (Logic.nth_prem (1, Thm.prop_of rule)) |
18185 | 229 |
|> map (fn asm => (Term.betapplys (Term.list_abs (ps, asm), ts), ([], []))); |
18678 | 230 |
val _ = conditional (null asms) (fn () => error "Trivial result -- nothing guessed"); |
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231 |
in |
18670 | 232 |
Proof.fix_i (map (apsnd SOME) parms) |
18678 | 233 |
#> Proof.assm_i (K (obtain_export ctxt ts rule)) [(("", []), asms)] |
17974 | 234 |
#> Proof.add_binds_i AutoBind.no_facts |
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235 |
end; |
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236 |
|
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val before_qed = SOME (Method.primitive_text (Goal.conclude #> Goal.protect)); |
18124 | 238 |
fun after_qed [[res]] = |
17974 | 239 |
(check_result res; Proof.end_block #> Seq.map (`Proof.the_fact #-> guess_context)); |
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240 |
in |
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241 |
state |
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242 |
|> Proof.enter_forward |
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243 |
|> Proof.begin_block |
18670 | 244 |
|> Proof.fix_i [(AutoBind.thesisN, NONE)] |
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|> Proof.chain_facts chain_facts |
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|> Proof.local_goal (ProofDisplay.print_results int) (K I) (apsnd (rpair I)) |
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"guess" before_qed after_qed [(("", []), [Var (("guess", 0), propT)])] |
18151 | 248 |
|> Proof.refine (Method.primitive_text (K (Goal.init (Thm.cterm_of thy thesis)))) |> Seq.hd |
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249 |
end; |
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250 |
|
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251 |
in |
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252 |
|
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val guess = gen_guess ProofContext.read_vars; |
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val guess_i = gen_guess ProofContext.cert_vars; |
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255 |
|
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256 |
end; |
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257 |
|
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258 |
end; |