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Update main.whiley #8

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21 changes: 14 additions & 7 deletions src/elab/labs/whiley-boogie/src/main.whiley
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Original file line number Diff line number Diff line change
Expand Up @@ -90,18 +90,25 @@ ensures all { j in 0..length | lsp[j].q == s2 + j }:

function safeQzip(nat[] l1, nat[] l2) -> (safePair[] lsp)
requires |l1| == |l2|
requires |l1| == 0 || l1[0] != l2[0]
requires all { i in 0..|l1| | l1[i] == l1[0] + i }
requires all { j in 0..|l2| | l2[j] == l2[0] + j }
requires all { i in 0..|l1| | l1[i] != l2[i] }

ensures |lsp| == |l1|
ensures |lsp| == |l2|
ensures all { i in 0..|lsp| | lsp[i].p == l1[i]}
ensures all { j in 0..|lsp| | lsp[j].q == l2[j]}:

if |l1| == 0:
return([])
else:
return safeQzip_easy(|l1|, l1[0], l2[0])
nat length = |l1|
safePair[] ll = [{p: 0, q: 1}; length]

nat i = 0
while i < length
where |ll| == length
where all { k in 0..i | ll[k].p == l1[k] }
where all { k in 0..i | ll[k].q == l2[k] }:
ll[i] = {p: l1[i], q:l2[i]}
i = i + 1

return ll



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