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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: BidirectionalCollection {
public typealias SubSequence = BigSubstring
public var isEmpty: Bool {
_rope.summary.isZero
}
public var startIndex: Index {
Index(_utf8Offset: 0)._knownCharacterAligned()
}
public var endIndex: Index {
Index(_utf8Offset: _utf8Count)._knownCharacterAligned()
}
public var count: Int { _characterCount }
@inline(__always)
public func index(after i: Index) -> Index {
_characterIndex(after: i)
}
@inline(__always)
public func index(before i: Index) -> Index {
_characterIndex(before: i)
}
@inline(__always)
public func index(_ i: Index, offsetBy distance: Int) -> Index {
_characterIndex(i, offsetBy: distance)
}
public func index(_ i: Index, offsetBy distance: Int, limitedBy limit: Index) -> Index? {
_characterIndex(i, offsetBy: distance, limitedBy: limit)
}
public func distance(from start: Index, to end: Index) -> Int {
_characterDistance(from: start, to: end)
}
public subscript(position: Index) -> Character {
self[_character: position]
}
public subscript(bounds: Range<Index>) -> BigSubstring {
BigSubstring(self, in: bounds)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigString {
public func index(roundingDown i: Index) -> Index {
_characterIndex(roundingDown: i)
}
public func index(roundingUp i: Index) -> Index {
_characterIndex(roundingUp: i)
}
}
#endif
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