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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Collections open source project
//
// Copyright (c) 2023 - 2024 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
//
//===----------------------------------------------------------------------===//
#if swift(>=5.8)
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigString {
public struct UTF8View: Sendable {
var _base: BigString
@inline(__always)
init(_base: BigString) {
self._base = _base
}
}
@inline(__always)
public var utf8: UTF8View {
UTF8View(_base: self)
}
public init(_ utf8: UTF8View) {
self = utf8._base
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigString.UTF8View: Equatable {
public static func ==(left: Self, right: Self) -> Bool {
BigString.utf8IsEqual(left._base, to: right._base)
}
public func isIdentical(to other: Self) -> Bool {
self._base.isIdentical(to: other._base)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigString.UTF8View: Hashable {
public func hash(into hasher: inout Hasher) {
_base.hashUTF8(into: &hasher)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigString.UTF8View: Sequence {
public typealias Element = UInt8
public struct Iterator {
internal let _base: BigString
internal var _index: BigString.Index
internal init(_base: BigString, from start: BigString.Index) {
self._base = _base
self._index = _base._utf8Index(roundingDown: start)
}
}
public func makeIterator() -> Iterator {
Iterator(_base: _base, from: self.startIndex)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigString.UTF8View.Iterator: IteratorProtocol {
public typealias Element = UInt8
public mutating func next() -> UInt8? {
guard _index < _base.endIndex else { return nil }
// Hand-optimized from `_base.subscript(utf8:)` and `_base.utf8Index(after:)`.
let ri = _index._rope!
var ci = _index._chunkIndex
let chunk = _base._rope[ri]
let result = chunk.string.utf8[ci]
chunk.string.utf8.formIndex(after: &ci)
if ci < chunk.string.endIndex {
_index = BigString.Index(baseUTF8Offset: _index._utf8BaseOffset, _rope: ri, chunk: ci)
} else {
_index = BigString.Index(
baseUTF8Offset: _index._utf8BaseOffset + chunk.utf8Count,
_rope: _base._rope.index(after: ri),
chunk: String.Index(_utf8Offset: 0))
}
return result
}
public mutating func next<R>(
maximumCount: Int,
with body: (UnsafeBufferPointer<UInt8>) -> (consumed: Int, result: R)
) -> R {
guard _index < _base.endIndex else {
let r = body(UnsafeBufferPointer(start: nil, count: 0))
precondition(r.consumed == 0)
return r.result
}
let ri = _index._rope!
var ci = _index._utf8ChunkOffset
var utf8Offset = _index.utf8Offset
var string = _base._rope[ri].string
let (haveMore, result) = string.withUTF8 { buffer in
let slice = buffer[ci...].prefix(maximumCount)
assert(!slice.isEmpty)
let (consumed, result) = body(UnsafeBufferPointer(rebasing: slice))
precondition(consumed >= 0 && consumed <= slice.count)
utf8Offset += consumed
ci += consumed
return (ci < buffer.count, result)
}
if haveMore {
_index = BigString.Index(_utf8Offset: utf8Offset, _rope: ri, chunkOffset: ci)
} else {
_index = BigString.Index(
baseUTF8Offset: _index._utf8BaseOffset + string.utf8.count,
_rope: _base._rope.index(after: ri),
chunk: String.Index(_utf8Offset: 0))
}
return result
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigString.UTF8View: BidirectionalCollection {
public typealias Index = BigString.Index
public typealias SubSequence = BigSubstring.UTF8View
@inline(__always)
public var startIndex: Index { _base.startIndex }
@inline(__always)
public var endIndex: Index { _base.endIndex }
public var count: Int { _base._utf8Count }
@inline(__always)
public func index(after i: Index) -> Index {
_base._utf8Index(after: i)
}
@inline(__always)
public func index(before i: Index) -> Index {
_base._utf8Index(before: i)
}
@inline(__always)
public func index(_ i: Index, offsetBy distance: Int) -> Index {
_base._utf8Index(i, offsetBy: distance)
}
public func index(_ i: Index, offsetBy distance: Int, limitedBy limit: Index) -> Index? {
_base._utf8Index(i, offsetBy: distance, limitedBy: limit)
}
public func distance(from start: Index, to end: Index) -> Int {
_base._utf8Distance(from: start, to: end)
}
public subscript(position: Index) -> UInt8 {
_base[_utf8: position]
}
public subscript(bounds: Range<Index>) -> BigSubstring.UTF8View {
BigSubstring.UTF8View(_base, in: bounds)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigString.UTF8View {
public func index(roundingDown i: Index) -> Index {
_base._utf8Index(roundingDown: i)
}
public func index(roundingUp i: Index) -> Index {
_base._utf8Index(roundingUp: i)
}
}
#endif
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