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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 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
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#if FOUNDATION_FRAMEWORK
@_spi(Unstable) internal import CollectionsInternal
#elseif canImport(_RopeModule)
internal import _RopeModule
#elseif canImport(_FoundationCollections)
internal import _FoundationCollections
#endif
@available(FoundationPreview 6.2, *)
extension AttributedString {
/// A view of an attributed string’s contents as a collection of UTF-16 code units.
public struct UTF16View: Sendable {
internal var _guts: Guts
internal var _range: Range<BigString.Index>
internal var _identity: Int = 0
internal init(_ guts: AttributedString.Guts) {
self.init(guts, in: guts.stringBounds)
}
internal init(_ guts: Guts, in range: Range<BigString.Index>) {
_guts = guts
_range = range
}
}
/// A view of the attributed string’s contents as a collection of UTF-16 code units.
public var utf16: UTF16View {
UTF16View(_guts)
}
}
@available(FoundationPreview 6.2, *)
extension AttributedSubstring {
/// A view of the attributed substring's contents as a collection of UTF-16 code units.
public var utf16: AttributedString.UTF16View {
AttributedString.UTF16View(_guts, in: _range)
}
}
@available(FoundationPreview 6.2, *)
extension AttributedString.UTF16View {
var _utf16: BigSubstring.UTF16View {
BigSubstring.UTF16View(_unchecked: _guts.string, in: _range)
}
}
@available(FoundationPreview 6.2, *)
extension AttributedString.UTF16View: BidirectionalCollection {
public typealias Element = UTF16.CodeUnit
public typealias Index = AttributedString.Index
public typealias Subsequence = Self
public var startIndex: AttributedString.Index {
.init(_range.lowerBound, version: _guts.version)
}
public var endIndex: AttributedString.Index {
.init(_range.upperBound, version: _guts.version)
}
public var count: Int {
_utf16.count
}
public func index(before i: AttributedString.Index) -> AttributedString.Index {
precondition(i > startIndex && i <= endIndex, "AttributedString index out of bounds")
let j = Index(_guts.string.utf16.index(before: i._value), version: _guts.version)
precondition(j >= startIndex, "Can't advance AttributedString index before start index")
return j
}
public func index(after i: AttributedString.Index) -> AttributedString.Index {
precondition(i >= startIndex && i < endIndex, "AttributedString index out of bounds")
let j = Index(_guts.string.utf16.index(after: i._value), version: _guts.version)
precondition(j <= endIndex, "Can't advance AttributedString index after end index")
return j
}
public func index(_ i: AttributedString.Index, offsetBy distance: Int) -> AttributedString.Index {
precondition(i >= startIndex && i <= endIndex, "AttributedString index out of bounds")
let j = Index(_guts.string.utf16.index(i._value, offsetBy: distance), version: _guts.version)
precondition(j >= startIndex && j <= endIndex, "AttributedString index out of bounds")
return j
}
public func index(
_ i: AttributedString.Index,
offsetBy distance: Int,
limitedBy limit: AttributedString.Index
) -> AttributedString.Index? {
precondition(i >= startIndex && i <= endIndex, "AttributedString index out of bounds")
precondition(limit >= startIndex && limit <= endIndex, "AttributedString index out of bounds")
guard let j = _guts.string.utf16.index(
i._value, offsetBy: distance, limitedBy: limit._value
) else {
return nil
}
precondition(j >= startIndex._value && j <= endIndex._value,
"AttributedString index out of bounds")
return Index(j, version: _guts.version)
}
public func distance(
from start: AttributedString.Index,
to end: AttributedString.Index
) -> Int {
precondition(start >= startIndex && start <= endIndex, "AttributedString index out of bounds")
precondition(end >= startIndex && end <= endIndex, "AttributedString index out of bounds")
return _guts.string.utf16.distance(from: start._value, to: end._value)
}
public subscript(index: AttributedString.Index) -> UTF16.CodeUnit {
precondition(index >= startIndex && index < endIndex, "AttributedString index out of bounds")
return _guts.string.utf16[index._value]
}
public subscript(bounds: Range<AttributedString.Index>) -> Self {
let bounds = bounds._bstringRange
precondition(
bounds.lowerBound >= _range.lowerBound && bounds.lowerBound <= _range.upperBound &&
bounds.upperBound >= _range.lowerBound && bounds.upperBound <= _range.upperBound,
"AttributedString index range out of bounds")
return Self(_guts, in: bounds)
}
}
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