Mercurial > hg > Papers > 2018 > ryokka-thesis

comparison final_pre/src/AgdaPushPop.agda @ 7:28f900230c26

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add final_pre
author ryokka
date Mon, 19 Feb 2018 23:32:24 +0900
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6:d927f6b3d2b3 7:28f900230c26
1 pushSingleLinkedStack : Meta -> Meta
2 pushSingleLinkedStack m = M.exec (liftMeta n) (record m {stack = (push s e) })
3 where
4 n = Meta.nextCS m
5 s = Meta.stack m
6 e = Context.element (Meta.context m)
7 push : SingleLinkedStack A -> Maybe A -> SingleLinkedStack A
8 push s nothing = s
9 push s (just x) = record {top = just (cons x (top s))}
10
11 popSingleLinkedStack : Meta -> Meta
12 popSingleLinkedStack m = M.exec (liftMeta n) (record m {stack = (st m) ; context = record con {element = (elem m)}})
13 where
14 n = Meta.nextCS m
15 con = Meta.context m
16 elem : Meta -> Maybe A
17 elem record {stack = record { top = (just (cons x _)) }} = just x
18 elem record {stack = record { top = nothing }} = nothing
19 st : Meta -> SingleLinkedStack A
20 st record {stack = record { top = (just (cons _ s)) }} = record {top = s}
21 st record {stack = record { top = nothing }} = record {top = nothing}
22
23
24 pushSingleLinkedStackCS : M.CodeSegment Meta Meta
25 pushSingleLinkedStackCS = M.cs pushSingleLinkedStack
26
27 popSingleLinkedStackCS : M.CodeSegment Meta Meta
28 popSingleLinkedStackCS = M.cs popSingleLinkedStack