src/HOL/ex/Predicate_Compile.thy
author haftmann
Tue, 31 Mar 2009 11:04:05 +0200
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theory Predicate_Compile
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imports Complex_Main Code_Index Lattice_Syntax
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uses "predicate_compile.ML"
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begin
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setup {* Predicate_Compile.setup *}
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primrec "next" :: "('a Predicate.pred \<Rightarrow> ('a \<times> 'a Predicate.pred) option)
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  \<Rightarrow> 'a Predicate.seq \<Rightarrow> ('a \<times> 'a Predicate.pred) option" where
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    "next yield Predicate.Empty = None"
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  | "next yield (Predicate.Insert x P) = Some (x, P)"
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  | "next yield (Predicate.Join P xq) = (case yield P
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   of None \<Rightarrow> next yield xq | Some (x, Q) \<Rightarrow> Some (x, Predicate.Seq (\<lambda>_. Predicate.Join Q xq)))"
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ML {*
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let
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  fun yield (@{code Predicate.Seq} f) = @{code next} yield (f ())
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in
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  yield @{code "\<bottom> :: 'a Predicate.pred"} (*replace bottom with sequence to evaluate*)
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end
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*}
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fun pull :: "('a Predicate.pred \<Rightarrow> ('a \<times> 'a Predicate.pred) option)
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  \<Rightarrow> index \<Rightarrow> 'a Predicate.pred \<Rightarrow> 'a list \<times> 'a Predicate.pred" where
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  "pull yield k P = (if k = 0 then ([], \<bottom>)
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    else case yield P of None \<Rightarrow> ([], \<bottom>) | Some (x, Q) \<Rightarrow> let (xs, R) = pull yield (k - 1) Q in (x # xs, R))"
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ML {*
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let
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  fun yield (@{code Predicate.Seq} f) = @{code next} yield (f ())
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  fun yieldn k = @{code pull} yield k
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in
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  yieldn 0 (*replace with number of elements to retrieve*)
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    @{code "\<bottom> :: 'a Predicate.pred"} (*replace bottom with sequence to evaluate*)
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end
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*}
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end