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Factor out right/down.

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This commit is contained in:
Rob Rix 2015-10-13 17:50:22 -04:00
parent e09d46d109
commit 32bfdc6766
1 changed files with 6 additions and 4 deletions
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10
prototype/Doubt/SES.swift
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@ -53,17 +53,19 @@ public func SES<A>(a: [Fix<A>], _ b: [Fix<A>], equals: (A, A) -> Bool, recur: (F
}
if let right = right, down = down, diagonal = diagonal {
let right = (right, Diff.Pure(Patch.Delete(a[i])), costOfStream(right))
let down = (down, Diff.Pure(Patch.Insert(b[j])), costOfStream(down))
// nominate the best edge to continue along
if let compareHere = recur(a[i], b[j]) {
let (best, diff, _) = min(
(diagonal, compareHere, costOfStream(diagonal)),
(right, Diff.Pure(Patch.Delete(a[i])), costOfStream(right)),
(down, Diff.Pure(Patch.Insert(b[j])), costOfStream(down))) { $0.2 < $1.2 }
right,
down) { $0.2 < $1.2 }
return cons(diff, rest: best)
} else {
let (best, diff, _) = min(
(right, Diff.Pure(Patch.Delete(a[i])), costOfStream(right)),
(down, Diff.Pure(Patch.Insert(b[j])), costOfStream(down))) { $0.2 < $1.2 }
right,
down) { $0.2 < $1.2 }
return cons(diff, rest: best)
}
}