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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2025 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
/// The results of diffing two sequences
public struct Diff<T: Comparable> {
/// Values that were present in the left sequence but absent in the right sequence.
public var left: [T] = []
/// Values that were present in both sequences.
public var equal: [T] = []
/// Values that were present in the right sequence but absent in the left sequence.
public var right: [T] = []
}
extension Diff: Sendable where T: Sendable {}
public extension Sequence where Element: Comparable {
/// Compares the contents of two sequences of comparable contents.
///
/// Puts each item in both sequences into a bucket according to which sequence(s) contain it.
func diff<T: Sequence>(against other: T) -> Diff<Element> where T.Element == Element {
var diff = Diff<Element>()
var leftIterator = sorted().makeIterator()
var rightIterator = other.sorted().makeIterator()
var leftItem = leftIterator.next()
var rightItem = rightIterator.next()
while let left = leftItem, let right = rightItem {
if left == right {
diff.equal.append(left)
leftItem = leftIterator.next()
rightItem = rightIterator.next()
} else if left < right {
diff.left.append(left)
leftItem = leftIterator.next()
} else {
diff.right.append(right)
rightItem = rightIterator.next()
}
}
while let left = leftItem {
diff.left.append(left)
leftItem = leftIterator.next()
}
while let right = rightItem {
diff.right.append(right)
rightItem = rightIterator.next()
}
return diff
}
}
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