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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 FieldPositer {
let positer: OpaquePointer
internal init() throws {
var status = U_ZERO_ERROR
positer = ufieldpositer_open(&status)
try status.checkSuccess()
}
deinit {
ufieldpositer_close(positer)
}
var fields: Fields {
Fields(positer: self)
}
struct Fields : Sequence {
struct Element {
var field: Int
var begin: Int
var end: Int
}
let positer: FieldPositer
init(positer: FieldPositer) {
self.positer = positer
}
func makeIterator() -> Iterator {
Iterator(positer: positer)
}
struct Iterator : IteratorProtocol {
var beginIndex: Int32 = 0
var endIndex: Int32 = 0
let positer: FieldPositer
init(positer: FieldPositer) {
self.positer = positer
}
mutating func next() -> Element? {
let next = ufieldpositer_next(positer.positer, &beginIndex, &endIndex)
guard next >= 0 else { return nil }
return Element(field: Int(next), begin: Int(beginIndex), end: Int(endIndex))
}
}
}
}
}
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