author  immler 
Wed, 13 Jun 2018 09:11:35 +0200  
changeset 68433  f396f5490a8c 
parent 68430  b0eb6a91924d 
child 68434  c6a38342376e 
permissions  rwrr 
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(* Title: HOL/Types_To_Sets/unoverload_type.ML 
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Author: Fabian Immler, TU München 
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Internalize sorts and unoverload parameters of a type variable. 
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*) 
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signature UNOVERLOAD_TYPE = 
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sig 
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val unoverload_type: Context.generic > indexname > thm > thm 
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val unoverload_type_attr: indexname > attribute 

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end; 
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structure Unoverload_Type : UNOVERLOAD_TYPE = 
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struct 
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fun those [] = [] 
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 those (NONE::xs) = those xs 
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 those (SOME x::xs) = x::those xs 
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fun params_of_sort context sort = 
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let 
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val algebra = Sign.classes_of (Context.theory_of context) 
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val params = List.concat (map (Sorts.super_classes algebra) sort) > 
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map (try (Axclass.get_info (Context.theory_of context))) > 
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those > 
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map #params > 
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List.concat 
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in params end 
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fun internalize_sort' ctvar thm = 
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let 
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val (_, thm') = Internalize_Sort.internalize_sort ctvar thm 
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val class_premise = case Thm.prems_of thm' of t::_=> t  [] => 
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raise THM ("internalize_sort': no premise?", 0, [thm']) 
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val class_vars = Term.add_tvars class_premise [] 
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val tvar = case class_vars of [x] => TVar x  _ => 
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raise TERM ("internalize_sort': not one type class variable.", [class_premise]) 
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in 
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(tvar, thm') 
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end 
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fun unoverload_type context x thm = 
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let 
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val tvars = Term.add_tvars (Thm.prop_of thm) [] 
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val thy = Context.theory_of context 
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in 
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case find_first (fn (y, _) => x = y) tvars of NONE => 
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raise THM ("unoverload_type: type variable ("^(@{make_string} x)^") not in theorem", 0, [thm]) 

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 SOME (x as (_, sort)) => 
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let 
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val (tvar, thm') = internalize_sort' (Thm.global_ctyp_of thy (TVar x)) thm 
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val consts = params_of_sort context sort > 
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map (apsnd (map_type_tfree (fn ("'a", _) => tvar  x => TFree x))) 
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in 
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fold (fn c => Unoverloading.unoverload (Thm.global_cterm_of thy (Const c))) consts thm' 
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end 
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end 
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fun unoverload_type_attr x = Thm.rule_attribute [] (fn context => unoverload_type context x) 
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val _ = Context.>> (Context.map_theory (Attrib.setup @{binding unoverload_type} 
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(Scan.lift Args.var >> unoverload_type_attr) "internalize a sort")) 
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end 