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Correct the index updated vs. the index moved to.

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This commit is contained in:
Rob Rix 2015-11-05 11:29:29 -05:00
parent 3d0a53a6b4
commit deb3745613
1 changed files with 3 additions and 3 deletions
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6
prototype/Doubt/Location.swift
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@ -91,15 +91,15 @@ public struct Location<A>: SequenceType {
// MARK: - Implementation details
private init?<C: MutableCollectionType where C.Generator.Element == A, C.Index: BidirectionalIndexType>(_ weave: (A -> Location?) -> A -> Location?, _ up: C -> Location?, _ ts: C) {
func update(index: C.Index)(_ f: C.Index -> C -> Location?)(_ a: A) -> Location? {
func update(index: C.Index)(_ f: C -> Location?)(_ a: A) -> Location? {
guard ts.indices.contains(index) else { return nil }
var copy = ts
copy[index] = a
return f(index)(copy)
return f(copy)
}
func into(index: C.Index)(_ ts: C) -> Location? {
guard ts.indices.contains(index) else { return nil }
return Location(it: ts[index], down: weave(update(index)(into)), up: update(index)(const(up)), left: update(index.predecessor())(into), right: update(index.successor())(into))
return Location(it: ts[index], down: weave(update(index)(into(index))), up: update(index)(up), left: update(index)(into(index.predecessor())), right: update(index)(into(index.successor())))
}
guard let location = into(ts.startIndex)(ts) else { return nil }
self = location