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(* Title: Pure/ML/ml_thms.ML
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ID: $Id$
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Author: Makarius
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Isar theorem values within ML.
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*)
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signature ML_THMS =
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sig
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val the_thms: Proof.context -> int -> thm list
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val the_thm: Proof.context -> int -> thm
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end;
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structure ML_Thms: ML_THMS =
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struct
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(* auxiliary facts table *)
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structure AuxFacts = ProofDataFun
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(
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type T = thm list Inttab.table;
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fun init _ = Inttab.empty;
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);
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val put_thms = AuxFacts.map o Inttab.update;
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fun the_thms ctxt name = the (Inttab.lookup (AuxFacts.get ctxt) name);
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fun the_thm ctxt name = the_single (the_thms ctxt name);
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fun thm_bind kind a i =
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"val " ^ a ^ " = ML_Thms.the_" ^ kind ^
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" (ML_Context.the_local_context ()) " ^ string_of_int i ^ ";\n";
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(* fact references *)
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fun thm_antiq kind scan = ML_Context.add_antiq kind
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(scan >> (fn ths => fn {struct_name, background} =>
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let
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val i = serial ();
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val (a, background') = background
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|> ML_Antiquote.variant kind ||> put_thms (i, ths);
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val ml = (thm_bind kind a i, struct_name ^ "." ^ a);
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in (K ml, background') end));
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val _ = thm_antiq "thm" (Attrib.thm >> single);
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val _ = thm_antiq "thms" Attrib.thms;
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(* ad-hoc goals *)
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fun by x = Scan.lift (Args.$$$ "by") x;
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val goal = Scan.unless by Args.prop;
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val _ = ML_Context.add_antiq "lemma"
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((Args.context -- Scan.repeat1 goal -- (by |-- Scan.lift Method.parse_args)) >>
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(fn ((ctxt, props), method_text) => fn {struct_name, background} =>
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let
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val i = serial ();
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fun after_qed [res] goal_ctxt =
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put_thms (i, map Goal.norm_result (ProofContext.export goal_ctxt ctxt res)) goal_ctxt;
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val ctxt' = ctxt
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|> Proof.theorem_i NONE after_qed [map (rpair []) props]
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|> Proof.global_terminal_proof (method_text, NONE);
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val (a, background') = background
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|> ML_Antiquote.variant "lemma" ||> put_thms (i, the_thms ctxt' i);
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val ml = (thm_bind (if length props = 1 then "thm" else "thms") a i, struct_name ^ "." ^ a);
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in (K ml, background') end));
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end;
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