author | haftmann |
Tue, 31 Mar 2009 11:04:05 +0200 | |
changeset 30810 | 83642621425a |
parent 30374 | 7311a1546d85 |
child 30812 | 7d02340f095d |
permissions | -rw-r--r-- |
haftmann@30374 | 1 |
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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|
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setup {* Predicate_Compile.setup *} |
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|
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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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|
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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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|
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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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|
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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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|
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end |