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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
internal import _FoundationICU
extension ICU {
final class Enumerator {
let enumerator: OpaquePointer
init(enumerator: OpaquePointer) {
self.enumerator = enumerator
}
deinit {
uenum_close(enumerator)
}
var elements: Elements {
Elements(enumerator: self)
}
struct Elements : Sequence {
let enumerator: Enumerator
init(enumerator: Enumerator) {
self.enumerator = enumerator
}
func makeIterator() -> Iterator {
Iterator(enumerator: enumerator)
}
struct Iterator : IteratorProtocol {
var beginIndex: Int32 = 0
var endIndex: Int32 = 0
let enumerator: Enumerator
init(enumerator: Enumerator) {
self.enumerator = enumerator
}
mutating func next() -> String? {
var status = U_ZERO_ERROR
var resultLength = Int32(0)
let result = uenum_next(enumerator.enumerator, &resultLength, &status)
guard status.isSuccess, let result else {
return nil
}
return String(cString: result)
}
}
}
}
}
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