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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 BigSubstring {
public struct UTF8View: Sendable {
internal var _base: BigString
internal var _bounds: Range<Index>
public init(_unchecked base: BigString, in bounds: Range<Index>) {
self._base = base
self._bounds = bounds
}
public init(_ base: BigString, in bounds: Range<Index>) {
self._base = base
let lower = base._utf8Index(roundingDown: bounds.lowerBound)
let upper = base._utf8Index(roundingDown: bounds.upperBound)
self._bounds = Range(uncheckedBounds: (lower, upper))
}
internal init(_substring: BigSubstring) {
self.init(_unchecked: _substring._base, in: _substring._bounds)
}
}
public var utf8: UTF8View {
UTF8View(_substring: self)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigString {
public init?(_ utf8: BigSubstring.UTF8View) {
guard
utf8._base.unicodeScalars.index(roundingDown: utf8.startIndex) == utf8.startIndex,
utf8._base.unicodeScalars.index(roundingDown: utf8.endIndex) == utf8.endIndex
else {
return nil
}
self.init(_from: utf8._base, in: utf8._bounds)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigSubstring.UTF8View {
public var base: BigString.UTF8View { _base.utf8 }
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigSubstring.UTF8View: Equatable {
public static func ==(left: Self, right: Self) -> Bool {
BigString.utf8IsEqual(left._base, in: left._bounds, to: right._base, in: right._bounds)
}
public func isIdentical(to other: Self) -> Bool {
guard self._base.isIdentical(to: other._base) else { return false }
return self._bounds == other._bounds
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigSubstring.UTF8View: Hashable {
public func hash(into hasher: inout Hasher) {
_base.hashUTF8(into: &hasher, from: _bounds.lowerBound, to: _bounds.upperBound)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigSubstring.UTF8View: Sequence {
public typealias Element = UInt8
public struct Iterator: IteratorProtocol {
var _it: BigString.UTF8View.Iterator
var _end: BigString.Index
init(_substring: BigSubstring.UTF8View) {
self._it = .init(_base: _substring._base, from: _substring.startIndex)
self._end = _substring.endIndex
}
public mutating func next() -> UInt8? {
guard _it._index < _end else { return nil }
return _it.next()
}
}
public func makeIterator() -> Iterator {
Iterator(_substring: self)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigSubstring.UTF8View: BidirectionalCollection {
public typealias Index = BigString.Index
public typealias SubSequence = Self
@inline(__always)
public var startIndex: Index { _bounds.lowerBound }
@inline(__always)
public var endIndex: Index { _bounds.upperBound }
public var count: Int {
distance(from: _bounds.lowerBound, to: _bounds.upperBound)
}
@inline(__always)
public func index(after i: Index) -> Index {
precondition(i < endIndex, "Can't advance above end index")
return _base._utf8Index(after: i)
}
@inline(__always)
public func index(before i: Index) -> Index {
precondition(i > startIndex, "Can't advance below start index")
return _base._utf8Index(before: i)
}
@inline(__always)
public func index(_ i: Index, offsetBy distance: Int) -> Index {
precondition(i >= startIndex && i <= endIndex, "Index out of bounds")
let j = _base._utf8Index(i, offsetBy: distance)
precondition(j >= startIndex && j <= endIndex, "Index out of bounds")
return j
}
public func index(_ i: Index, offsetBy distance: Int, limitedBy limit: Index) -> Index? {
precondition(i >= startIndex && i <= endIndex, "Index out of bounds")
guard let j = _base._utf8Index(i, offsetBy: distance, limitedBy: limit) else { return nil }
precondition(j >= startIndex && j <= endIndex, "Index out of bounds")
return j
}
public func distance(from start: Index, to end: Index) -> Int {
precondition(start >= startIndex && start <= endIndex, "Index out of bounds")
precondition(end >= startIndex && end <= endIndex, "Index out of bounds")
return _base._utf8Distance(from: start, to: end)
}
public subscript(position: Index) -> UInt8 {
precondition(position >= startIndex && position < endIndex, "Index out of bounds")
return _base[_utf8: position]
}
public subscript(bounds: Range<Index>) -> Self {
precondition(
bounds.lowerBound >= startIndex && bounds.upperBound <= endIndex,
"Range out of bounds")
return Self(_base, in: bounds)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigSubstring.UTF8View {
public func index(roundingDown i: Index) -> Index {
precondition(i >= startIndex && i <= endIndex, "Index out of bounds")
return _base._utf8Index(roundingDown: i)
}
public func index(roundingUp i: Index) -> Index {
precondition(i >= startIndex && i <= endIndex, "Index out of bounds")
return _base._utf8Index(roundingUp: i)
}
}
#endif
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