author  bulwahn 
Wed, 08 Dec 2010 18:07:03 +0100  
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parent 40915  a4c956d1f91f 
child 41104  013adf7ebd96 
permissions  rwrr 
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(* Author: Lukas Bulwahn, TU Muenchen *) 
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header {* Another simple counterexample generator *} 
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theory Smallcheck 
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imports Quickcheck 
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uses ("Tools/smallvalue_generators.ML") 
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begin 
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subsection {* small value generator type classes *} 
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class small = term_of + 
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fixes small :: "('a \<Rightarrow> term list option) \<Rightarrow> code_numeral \<Rightarrow> term list option" 
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instantiation unit :: small 
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begin 
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definition "small f d = f ()" 
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instance .. 
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end 
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instantiation int :: small 
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begin 
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function small' :: "(int => term list option) => int => int => term list option" 
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where "small' f d i = (if d < i then None else (case f i of Some t => Some t  None => small' f d (i + 1)))" 
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by pat_completeness auto 
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termination 
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by (relation "measure (%(_, d, i). nat (d + 1  i))") auto 
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definition "small f d = small' f (Code_Numeral.int_of d) ( (Code_Numeral.int_of d))" 
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instance .. 
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end 
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instantiation prod :: (small, small) small 
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begin 
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definition 
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"small f d = small (%x. small (%y. f (x, y)) d) d" 
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instance .. 
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end 
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subsection {* full small value generator type classes *} 
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class full_small = term_of + 
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fixes full_small :: "('a * (unit => term) \<Rightarrow> term list option) \<Rightarrow> code_numeral \<Rightarrow> term list option" 
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instantiation unit :: full_small 
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begin 
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definition "full_small f d = f (Code_Evaluation.valtermify ())" 
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instance .. 
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end 
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instantiation int :: full_small 
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begin 
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function full_small' :: "(int * (unit => term) => term list option) => int => int => term list option" 
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where "full_small' f d i = (if d < i then None else (case f (i, %_. Code_Evaluation.term_of i) of Some t => Some t  None => full_small' f d (i + 1)))" 
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by pat_completeness auto 
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termination 
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by (relation "measure (%(_, d, i). nat (d + 1  i))") auto 
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definition "full_small f d = full_small' f (Code_Numeral.int_of d) ( (Code_Numeral.int_of d))" 
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instance .. 
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end 
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instantiation prod :: (full_small, full_small) full_small 
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begin 
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definition 
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"full_small f d = full_small (%(x, t1). full_small (%(y, t2). f ((x, y), 
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%u. Code_Evaluation.App (Code_Evaluation.App (Code_Evaluation.term_of (Pair :: 'a => 'b => ('a * 'b))) (t1 ())) (t2 ()))) d) d" 
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instance .. 
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end 
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instantiation "fun" :: ("{equal, full_small}", full_small) full_small 
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begin 
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fun full_small_fun' :: "(('a => 'b) * (unit => term) => term list option) => code_numeral => code_numeral => term list option" 
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where 
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"full_small_fun' f i d = (if i > 1 then 
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full_small (%(a, at). full_small (%(b, bt). 
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full_small_fun' (%(g, gt). f (g(a := b), 
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(%_. let T1 = (Typerep.typerep (TYPE('a))); 
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T2 = (Typerep.typerep (TYPE('b))) 
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in 
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Code_Evaluation.App (Code_Evaluation.App (Code_Evaluation.App 
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(Code_Evaluation.Const (STR ''Fun.fun_upd'') 
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(Typerep.Typerep (STR ''fun'') [Typerep.Typerep (STR ''fun'') [T1, T2], 
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Typerep.Typerep (STR ''fun'') [T1, Typerep.Typerep (STR ''fun'') [T2, Typerep.Typerep (STR ''fun'') [T1, T2]]]])) 
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(gt ())) (at ())) (bt ())))) (i  1) d) d) d 
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else (if i > 0 then 
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full_small (%(b, t). f (%_. b, %_. Code_Evaluation.Abs (STR ''x'') (Typerep.typerep TYPE('a)) (t ()))) d else None))" 
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definition full_small_fun :: "(('a => 'b) * (unit => term) => term list option) => code_numeral => term list option" 
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where 
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"full_small_fun f d = full_small_fun' f d d" 
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instance .. 
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end 
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subsubsection {* A smarter enumeration scheme for functions over finite datatypes *} 
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class check_all = enum + term_of + 
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fixes check_all :: "('a * (unit \<Rightarrow> term) \<Rightarrow> term list option) \<Rightarrow> term list option" 
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fun check_all_n_lists :: "(('a :: check_all) list * (unit \<Rightarrow> term list) \<Rightarrow> term list option) \<Rightarrow> code_numeral \<Rightarrow> term list option" 
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where 
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"check_all_n_lists f n = 
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(if n = 0 then f ([], (%_. [])) else check_all (%(x, xt). check_all_n_lists (%(xs, xst). f ((x # xs), (%_. (xt () # xst ())))) (n  1)))" 
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instantiation "fun" :: ("{equal, enum, check_all}", "{enum, term_of, check_all}") check_all 
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begin 
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definition mk_map_term :: "'a list \<Rightarrow> (unit \<Rightarrow> term list) \<Rightarrow> (unit \<Rightarrow> typerep) \<Rightarrow> unit \<Rightarrow> term" 
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where 
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"mk_map_term domm rng T2 = 
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(%_. let T1 = (Typerep.typerep (TYPE('a))); 
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T2 = T2 (); 
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update_term = (%g (a, b). 
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Code_Evaluation.App (Code_Evaluation.App (Code_Evaluation.App 
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(Code_Evaluation.Const (STR ''Fun.fun_upd'') 
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(Typerep.Typerep (STR ''fun'') [Typerep.Typerep (STR ''fun'') [T1, T2], 
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Typerep.Typerep (STR ''fun'') [T1, Typerep.Typerep (STR ''fun'') [T2, Typerep.Typerep (STR ''fun'') [T1, T2]]]])) g) (Code_Evaluation.term_of a)) b) 
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in 
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List.foldl update_term (Code_Evaluation.Abs (STR ''x'') T1 (Code_Evaluation.Const (STR ''HOL.undefined'') T2)) (zip domm (rng ())))" 
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definition 
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"check_all f = check_all_n_lists (\<lambda>(ys, yst). f (the o map_of (zip (Enum.enum\<Colon>'a list) ys), mk_map_term (Enum.enum::'a list) yst (%_. Typerep.typerep (TYPE('b))))) (Code_Numeral.of_nat (length (Enum.enum :: 'a list)))" 
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instance .. 
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end 
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instantiation bool :: check_all 
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begin 
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definition 
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"check_all f = (case f (Code_Evaluation.valtermify False) of Some x' \<Rightarrow> Some x'  None \<Rightarrow> f (Code_Evaluation.valtermify True))" 
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instance .. 
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end 
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instantiation prod :: (check_all, check_all) check_all 
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begin 
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definition 
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"check_all f = check_all (%(x, t1). check_all (%(y, t2). f ((x, y), %_. Code_Evaluation.App (Code_Evaluation.App (Code_Evaluation.term_of (Pair :: 'a => 'b => ('a * 'b))) (t1 ())) (t2 ()))))" 
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instance .. 
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end 
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instantiation Enum.finite_1 :: check_all 
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begin 
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definition 
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"check_all f = f (Code_Evaluation.valtermify Enum.finite_1.a\<^isub>1)" 
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instance .. 
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end 
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instantiation Enum.finite_2 :: check_all 
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begin 
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definition 
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"check_all f = (case f (Code_Evaluation.valtermify Enum.finite_2.a\<^isub>1) of Some x' \<Rightarrow> Some x'  None \<Rightarrow> f (Code_Evaluation.valtermify Enum.finite_2.a\<^isub>2))" 
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instance .. 
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end 
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instantiation Enum.finite_3 :: check_all 
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begin 
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definition 
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"check_all f = (case f (Code_Evaluation.valtermify Enum.finite_3.a\<^isub>1) of Some x' \<Rightarrow> Some x'  None \<Rightarrow> (case f (Code_Evaluation.valtermify Enum.finite_3.a\<^isub>2) of Some x' \<Rightarrow> Some x'  None \<Rightarrow> f (Code_Evaluation.valtermify Enum.finite_3.a\<^isub>3)))" 
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instance .. 
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end 
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40620  206 
subsection {* Defining combinators for any firstorder data type *} 
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definition orelse :: "'a option => 'a option => 'a option" 
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where 
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[code_unfold]: "orelse x y = (case x of Some x' => Some x'  None => y)" 
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definition catch_match :: "term list option => term list option => term list option" 
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where 
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[code del]: "catch_match t1 t2 = (SOME t. t = t1 \<or> t = t2)" 
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code_const catch_match 
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(SML "(_) handle Match => _") 
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use "Tools/smallvalue_generators.ML" 
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setup {* Smallvalue_Generators.setup *} 
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declare [[quickcheck_tester = exhaustive]] 
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hide_fact orelse_def catch_match_def 
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hide_const (open) orelse catch_match mk_map_term check_all_n_lists 
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end 