mirror of
https://github.com/github/semantic.git
synced 2024-12-20 21:31:48 +03:00
40 lines
1.2 KiB
Swift
40 lines
1.2 KiB
Swift
private func unified(patch: Patch<Term>, source: String) -> String {
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return (patch.state.before.map { "{-\($0)-}" } ?? "")
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+ (patch.state.after.map { "{+\($0)+}" } ?? "")
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}
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private func range(patch: Patch<Term>) -> Range<Int>? {
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return patch.state.after?.extract.range
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}
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private func unified(range: Range<Int>, children: [(String, Range<Int>?)], source: String) -> String {
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var previous = range.startIndex
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var out: String = ""
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for (string, range) in children {
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if let range = range {
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out += String(source.utf16[previous..<range.startIndex])
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previous = range.endIndex
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}
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out += string
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}
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return out + String(source.utf16[previous..<range.endIndex])
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}
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func unified(diff: Diff, before: String, after: String) -> String {
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return diff.map { (unified($0, source: after), range($0)) }.cata { info, syntax in
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switch syntax {
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case .Leaf:
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return (String(after.utf16[info.1.range]), info.1.range)
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case let .Indexed(i):
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return (unified(info.1.range, children: i, source: after), info.1.range)
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case let .Fixed(f):
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return (unified(info.1.range, children: f, source: after), info.1.range)
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case let .Keyed(k):
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return (k.values.map { $0.0 }.joinWithSeparator(""), info.1.range)
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}
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}.0
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}
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import Doubt
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