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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 split(
at index: Index
) -> Builder {
let b = _ropeBuilder(at: index)
let state = b._breakState()
let builder = Builder(base: b, prefixEndState: state, suffixStartState: state)
return builder
}
mutating func split(
at index: Index,
state: _CharacterRecognizer
) -> Builder {
let b = _ropeBuilder(at: index)
let builder = Builder(base: b, prefixEndState: state, suffixStartState: state)
return builder
}
mutating func _ropeBuilder(at index: Index) -> _Rope.Builder {
if let ri = index._rope, _rope.isValid(ri) {
return _rope.split(at: ri, index._chunkIndex)
}
return _rope.builder(splittingAt: index.utf8Offset, in: _UTF8Metric())
}
}
#endif
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