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Make UUID.init work with larger integers. #403

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Merged
merged 2 commits into from
Nov 14, 2025
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Merged

Make UUID.init work with larger integers. #403

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Make UUID.init work with larger integers.
mbrandonw Nov 14, 2025
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wip
mbrandonw Nov 14, 2025
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21 changes: 20 additions & 1 deletion Sources/Dependencies/DependencyValues/UUID.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -113,8 +113,27 @@ public struct UUIDGenerator: Sendable {
}

extension UUID {
/// Initializes a UUID from an integer by converting it to hex and padding it with 0's.
///
/// For example:
///
/// ```swift
/// UUID(16) == UUID(uuidString: "00000000-0000-0000-0000000000F0")
/// ```
///
/// If a negative number is passed to this function then it is inverted and the negative sign
/// is encoded into the 16th bit of the UUID:
///
/// ```swift
/// UUID(-16) == UUID(uuidString: "00000000-0001-0000-0000000000F0")
/// 👆
/// ```
public init(_ intValue: Int) {
self.init(uuidString: "00000000-0000-0000-0000-\(String(format: "%012x", intValue))")!
let isNegative = intValue < 0
let intValue = isNegative ? -intValue : intValue
var hexString = String(format: "%016llx", intValue)
hexString.insert("-", at: hexString.index(hexString.startIndex, offsetBy: 4))
self.init(uuidString: "00000000-0000-000\(isNegative ? "1" : "0")-\(hexString)")!
}
}

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4 changes: 4 additions & 0 deletions Tests/DependenciesTests/UUIDTests.swift
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Expand Up @@ -18,5 +18,9 @@ final class UUIDDependencyTests: XCTestCase {
XCTAssertEqual(UUID(1), UUID(uuidString: "00000000-0000-0000-0000-000000000001"))
XCTAssertEqual(UUID(15), UUID(uuidString: "00000000-0000-0000-0000-00000000000F"))
XCTAssertEqual(UUID(256), UUID(uuidString: "00000000-0000-0000-0000-000000000100"))

XCTAssertEqual(UUID(Int.max), UUID(uuidString: "00000000-0000-0000-7FFF-FFFFFFFFFFFF"))
XCTAssertEqual(UUID(-1), UUID(uuidString: "00000000-0000-0001-0000-000000000001"))
XCTAssertEqual(UUID(-Int.max), UUID(uuidString: "00000000-0000-0001-7FFF-FFFFFFFFFFFF"))
}
}