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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, *)
internal typealias _CharacterRecognizer = Unicode._CharacterRecognizer
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension _CharacterRecognizer {
internal func _isKnownEqual(to other: Self) -> Bool {
// FIXME: Enable when Swift 5.9 ships.
// #if swift(>=5.9)
// if #available(macOS 9999, iOS 9999, tvOS 9999, watchOS 9999, *) { // SwiftStdlib 5.9
// return self == other
// }
// #endif
return false
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension _CharacterRecognizer {
mutating func firstBreak(
in str: Substring
) -> Range<String.Index>? {
let r = str.utf8.withContiguousStorageIfAvailable { buffer in
self._firstBreak(inUncheckedUnsafeUTF8Buffer: buffer)
}
if let r {
guard let scalarRange = r else { return nil }
let lower = str._utf8Index(at: scalarRange.lowerBound)
let upper = str._utf8Index(at: scalarRange.upperBound)
return lower ..< upper
}
guard !str.isEmpty else { return nil }
var i = str.startIndex
while i < str.endIndex {
let next = str.unicodeScalars.index(after: i)
let scalar = str.unicodeScalars[i]
if self.hasBreak(before: scalar) {
return i ..< next
}
i = next
}
return nil
}
}
@available(macOS 13.3, iOS 16.4, watchOS 9.4, tvOS 16.4, *)
extension _CharacterRecognizer {
init(partialCharacter: Substring.UnicodeScalarView) {
self.init()
var it = partialCharacter.makeIterator()
guard let first = it.next() else { return }
_ = hasBreak(before: first)
while let next = it.next() {
let b = hasBreak(before: next)
assert(!b)
}
}
init(partialCharacter: Substring) {
self.init(partialCharacter: partialCharacter.unicodeScalars)
}
mutating func consumePartialCharacter(_ s: String) {
for scalar in s.unicodeScalars {
let b = hasBreak(before: scalar)
assert(!b)
}
}
mutating func consumePartialCharacter(_ s: Substring) {
for scalar in s.unicodeScalars {
let b = hasBreak(before: scalar)
assert(!b)
}
}
mutating func consumePartialCharacter(_ s: Substring.UnicodeScalarView) {
for scalar in s {
let b = hasBreak(before: scalar)
assert(!b)
}
}
mutating func consumeUntilFirstBreak(
in s: Substring.UnicodeScalarView,
from i: inout String.Index
) -> String.Index? {
while i < s.endIndex {
defer { s.formIndex(after: &i) }
if hasBreak(before: s[i]) {
return i
}
}
return nil
}
init(consuming str: some StringProtocol) {
self.init()
_ = self.consume(str)
}
mutating func consume(
_ s: some StringProtocol
) -> (characters: Int, firstBreak: String.Index, lastBreak: String.Index)? {
consume(Substring(s))
}
mutating func consume(
_ s: Substring
) -> (characters: Int, firstBreak: String.Index, lastBreak: String.Index)? {
consume(s.unicodeScalars)
}
mutating func consume(
_ s: Substring.UnicodeScalarView
) -> (characters: Int, firstBreak: String.Index, lastBreak: String.Index)? {
var i = s.startIndex
guard let first = consumeUntilFirstBreak(in: s, from: &i) else {
return nil
}
var characters = 1
var last = first
while let next = consumeUntilFirstBreak(in: s, from: &i) {
characters += 1
last = next
}
return (characters, first, last)
}
mutating func consume(
_ chunk: BigString._Chunk, upTo index: String.Index
) -> (firstBreak: String.Index, prevBreak: String.Index)? {
let index = chunk.string.unicodeScalars._index(roundingDown: index)
let first = chunk.firstBreak
guard index > first else {
consumePartialCharacter(chunk.string[..<index])
return nil
}
let last = chunk.lastBreak
let prev = index <= last ? chunk.string[first...].index(before: index) : last
consumePartialCharacter(chunk.string[prev..<index])
return (first, prev)
}
mutating func edgeCounts(
consuming s: String
) -> (characters: Int, prefixCount: Int, suffixCount: Int) {
let c = s.utf8.count
guard let (chars, first, last) = consume(s[...]) else {
return (0, c, c)
}
let prefix = s._utf8Offset(of: first)
let suffix = c - s._utf8Offset(of: last)
return (chars, prefix, suffix)
}
}
#endif
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