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Inline size computations on Patch.

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This commit is contained in:
Rob Rix 2015-11-12 17:35:34 -05:00
parent 7da058ca55
commit 3f81b9d8b9
1 changed files with 8 additions and 1 deletions
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9
prototype/Doubt/Patch.swift
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@ -74,7 +74,14 @@ extension Patch {
extension Patch {
/// Returns a function which computes the size of a `patch` as the sum of the sizes of its terms, as computed by `size`.
public static func sum(@noescape size: A throws -> Int)(_ patch: Patch) rethrows -> Int {
return try (patch.state.before.map(size) ?? 0) + (patch.state.after.map(size) ?? 0)
switch patch {
case let .Replace(a, b):
return try size(a) + size(b)
case let .Insert(b):
return try size(b)
case let .Delete(a):
return try size(a)
}
}
/// Returns a function which computes the size of a `patch` as the absolute difference of the sizes of its terms, as computed by `size`.