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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 {
internal init(_from input: some StringProtocol) {
var builder = _Rope.Builder()
var ingester = _Ingester(input)
while let chunk = ingester.nextWellSizedChunk() {
builder.insertBeforeTip(chunk)
}
self._rope = builder.finalize()
}
internal init(_from input: some Sequence<Character>) {
var builder = Builder()
var piece = ""
for character in input {
piece.append(character)
if piece.utf8.count >= _Chunk.minUTF8Count {
builder.append(piece)
piece = ""
}
}
builder.append(piece)
self = builder.finalize()
}
internal init(_from input: some Sequence<UnicodeScalar>) {
var builder = Builder()
var piece = ""
for scalar in input {
piece.unicodeScalars.append(scalar)
if piece.utf8.count >= _Chunk.minUTF8Count {
builder.append(piece)
piece = ""
}
}
builder.append(piece)
self = builder.finalize()
}
internal init(_from other: BigSubstring) {
self.init(_from: other._base, in: other._bounds)
}
internal init(_from other: BigSubstring.UnicodeScalarView) {
self.init(_from: other._base, in: other._bounds)
}
internal init(
_from other: Self,
in range: Range<Index>
) {
self._rope = other._rope.extract(
from: range.lowerBound.utf8Offset,
to: range.upperBound.utf8Offset,
in: _UTF8Metric())
var old = other._breakState(upTo: range.lowerBound)
var new = _CharacterRecognizer()
_ = self._rope.resyncBreaks(old: &old, new: &new)
}
internal init(
_ other: Self,
in range: Range<Index>,
state: inout _CharacterRecognizer
) {
self._rope = other._rope.extract(
from: range.lowerBound.utf8Offset,
to: range.upperBound.utf8Offset,
in: _UTF8Metric())
var old = other._breakState(upTo: range.lowerBound)
var new = state
self._rope.resyncBreaksToEnd(old: &old, new: &new)
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension String {
public init(_ big: BigString) {
guard !big.isEmpty else {
self.init()
return
}
if big._rope.isSingleton {
self = big._rope[big._rope.startIndex].string
return
}
self.init()
self.reserveCapacity(big._utf8Count)
for chunk in big._rope {
self.append(chunk.string)
}
}
internal init(_from big: BigString, in range: Range<BigString.Index>) {
self.init()
var start = big._unicodeScalarIndex(roundingDown: range.lowerBound)
start = big.resolve(start, preferEnd: false)
var end = big._unicodeScalarIndex(roundingDown: range.upperBound)
end = big.resolve(end, preferEnd: true)
let utf8Capacity = end.utf8Offset - start.utf8Offset
guard utf8Capacity > 0 else { return }
self.reserveCapacity(utf8Capacity)
let startRopeIndex = start._rope!
let endRopeIndex = end._rope!
if startRopeIndex == endRopeIndex {
self += big._rope[startRopeIndex].string[start._chunkIndex ..< end._chunkIndex]
return
}
self += big._rope[startRopeIndex].string[start._chunkIndex...]
var i = big._rope.index(after: startRopeIndex)
while i < endRopeIndex {
self += big._rope[i].string
big._rope.formIndex(after: &i)
}
self += big._rope[endRopeIndex].string[..<end._chunkIndex]
}
public init(_ big: BigSubstring) {
self.init(_from: big._base, in: big._bounds)
}
public init(_ big: BigString.UnicodeScalarView) {
self.init(big._base)
}
public init(_ big: BigSubstring.UnicodeScalarView) {
self.init(_from: big._base, in: big._bounds)
}
}
#endif
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