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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 {
mutating func _removeSubrange(_ bounds: Range<Index>) {
precondition(bounds.upperBound <= endIndex, "Index out of bounds")
if bounds.isEmpty { return }
let lower = bounds.lowerBound.utf8Offset
let upper = bounds.upperBound.utf8Offset
_rope.removeSubrange(lower ..< upper, in: _UTF8Metric())
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension BigString {
mutating func removeCharacter(at i: Index) -> Character {
let start = self.resolve(i, preferEnd: false)
let (character, end) = self._character(at: start)
self.removeSubrange(start ..< end)
return character
}
mutating func removeUnicodeScalar(at i: Index) -> Unicode.Scalar {
precondition(i < endIndex, "Index out of bounds")
let start = _unicodeScalarIndex(roundingDown: i)
let ropeIndex = start._rope!
let chunkIndex = start._chunkIndex
let chunk = _rope[ropeIndex]
let scalar = chunk.string.unicodeScalars[chunkIndex]
let next = chunk.string.unicodeScalars.index(after: chunkIndex)
let end = Index(baseUTF8Offset: start._utf8BaseOffset, _rope: ropeIndex, chunk: next)
self.removeSubrange(start ..< end)
return scalar
}
}
#endif
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