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Conform LossLessStringConvertible for UUID #1303

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Conform LossLessStringConvertible for UUID #1303

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061512b
Impelment LossLessStringConvertible for UUID
jevonmao May 20, 2025
fef8d59
Add availability annotation
jevonmao May 24, 2025
9fae1cb
Add foundationpreview 6.2
jevonmao May 25, 2025
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10 changes: 9 additions & 1 deletion Sources/FoundationEssentials/UUID.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,7 @@ public struct UUID : Hashable, Equatable, CustomStringConvertible, Sendable {
public init(uuid: uuid_t) {
self.uuid = uuid
}

/// Returns a string created from the UUID, such as "E621E1F8-C36C-495A-93FC-0C247A3E6E5F"
public var uuidString: String {
var bytes: uuid_string_t = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
Expand Down Expand Up @@ -150,3 +150,11 @@ extension UUID : Comparable {
return result < 0
}
}

@available(FoundationPreview 6.2, *)
extension UUID: LosslessStringConvertible {
/// Create a UUID from a string representation conforming to `LosslessStringConvertible`.
public init?(_ description: String) {
self.init(uuidString: description)
}
}
15 changes: 15 additions & 0 deletions Tests/FoundationEssentialsTests/UUIDTests.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -115,4 +115,19 @@ final class UUIDTests : XCTestCase {
XCTAssertFalse(uuid2 > uuid1)
XCTAssertTrue(uuid2 == uuid1)
}

func test_UUIDLosslessStringConvertible() {
let originalString = "E621E1F8-C36C-495A-93FC-0C247A3E6E5F"
let uuidFromString = UUID(originalString)
XCTAssertNotNil(uuidFromString, "UUID must be constructible from valid UUID string via LosslessStringConvertible")
XCTAssertEqual(uuidFromString?.description, originalString, "Round-tripped description must match original UUID string")

let uuid = UUID(uuidString: originalString)!
XCTAssertEqual(uuid, UUID(uuid.description), "UUID must round-trip through LosslessStringConvertible")

let invalidString = "not-a-uuid"
let invalidUUID = UUID(invalidString)
XCTAssertNil(invalidUUID, "Invalid UUID strings must result in nil from LosslessStringConvertible initializer")
}

}