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Approximate SES.

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This commit is contained in:
Rob Rix 2015-09-16 14:58:53 -04:00
parent d92afc817e
commit 6a8915fc61
1 changed files with 17 additions and 1 deletions
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18
prototype/Doubt/Diff.swift
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@ -83,7 +83,23 @@ public enum Diff: CustomDebugStringConvertible, CustomDocConvertible, Equatable
}
public static func diff<C1: CollectionType, C2: CollectionType where C1.Index : RandomAccessIndexType, C1.Generator.Element == Fix, C2.Index : RandomAccessIndexType, C2.Generator.Element == Fix>(a: C1, _ b: C2) -> [Diff] {
return []
var (aa, bb) = (Stream(sequence: a), Stream(sequence: b))
var diffs: [Diff] = []
repeat {
if aa.isEmpty {
diffs += bb.lazy.map(Diff.Insert)
break
} else if bb.isEmpty {
diffs += aa.lazy.map(Diff.Delete)
break
} else {
diffs.append(Diff(aa.first!, bb.first!))
}
aa = aa.rest
bb = bb.rest
} while !aa.isEmpty || !bb.isEmpty
return diffs
}
}