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Diffs have a magnitude.

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This commit is contained in:
Rob Rix 2015-09-16 12:23:24 -04:00
parent e823f84d4a
commit 0dfd3a5ecd
1 changed files with 11 additions and 0 deletions
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11
prototype/Doubt/Diff.swift
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@ -28,6 +28,17 @@ public enum Diff: CustomDebugStringConvertible, CustomDocConvertible, Equatable
}
}
public var magnitude: Int {
switch self {
case .Empty:
return 0
case .Patch:
return 1
case let .Copy(s):
return s.map { $0.magnitude }.reduce(0, combine: +)
}
}
public init(_ a: Fix, _ b: Fix) {
switch (a, b) {
case (.Empty, .Empty):