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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2022 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
//
//===----------------------------------------------------------------------===//
import SwiftShims
//===----------------------------------------------------------------------===//
// Unicode.NFD
//===----------------------------------------------------------------------===//
extension Unicode {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public struct _NFD {
let base: Substring.UnicodeScalarView
}
}
@available(SwiftStdlib 5.7, *)
extension Unicode._NFD: Sendable {}
@available(SwiftStdlib 5.7, *)
extension Unicode._NFD {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public struct Iterator {
var base: Unicode._InternalNFD<Substring>.Iterator
}
}
@available(SwiftStdlib 5.7, *)
extension Unicode._NFD.Iterator: Sendable {}
@available(SwiftStdlib 5.7, *)
extension Unicode._NFD.Iterator: IteratorProtocol {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public mutating func next() -> Unicode.Scalar? {
base.next()?.scalar
}
}
@available(SwiftStdlib 5.7, *)
extension Unicode._NFD: Sequence {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public func makeIterator() -> Iterator {
Iterator(base: Unicode._InternalNFD(base: base).makeIterator())
}
}
extension String {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public var _nfd: Unicode._NFD {
Unicode._NFD(base: self[...].unicodeScalars)
}
}
extension Substring {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public var _nfd: Unicode._NFD {
Unicode._NFD(base: unicodeScalars)
}
}
//===----------------------------------------------------------------------===//
// Unicode.NFC
//===----------------------------------------------------------------------===//
extension Unicode {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public struct _NFC {
let base: Substring.UnicodeScalarView
}
}
@available(SwiftStdlib 5.7, *)
extension Unicode._NFC: Sendable {}
@available(SwiftStdlib 5.7, *)
extension Unicode._NFC {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public struct Iterator {
var base: Unicode._InternalNFC<Substring>.Iterator
}
}
@available(SwiftStdlib 5.7, *)
extension Unicode._NFC.Iterator: Sendable {}
@available(SwiftStdlib 5.7, *)
extension Unicode._NFC.Iterator: IteratorProtocol {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public mutating func next() -> Unicode.Scalar? {
base.next()
}
}
@available(SwiftStdlib 5.7, *)
extension Unicode._NFC: Sequence {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public func makeIterator() -> Iterator {
Iterator(
base: Unicode._InternalNFC<Substring>.Iterator(
iterator: Unicode._InternalNFD<Substring>(base: base).makeIterator()
)
)
}
}
extension String {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public var _nfc: Unicode._NFC {
Unicode._NFC(base: self[...].unicodeScalars)
}
}
extension Substring {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public var _nfc: Unicode._NFC {
Unicode._NFC(base: unicodeScalars)
}
}
//===----------------------------------------------------------------------===//
// Unicode.Script
//===----------------------------------------------------------------------===//
extension Unicode.Scalar.Properties {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public var _script: UInt8 {
let rawValue = _swift_stdlib_getScript(_scalar.value)
_internalInvariant(rawValue != .max, "Unknown script rawValue")
return rawValue
}
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public var _scriptExtensions: [UInt8] {
var count: UInt8 = 0
let pointer = _swift_stdlib_getScriptExtensions(_scalar.value, &count)
guard let pointer = pointer else {
return [_script]
}
var result: [UInt8] = []
result.reserveCapacity(Int(count))
for i in 0 ..< count {
let rawValue = pointer[Int(i)]
_internalInvariant(rawValue != .max, "Unknown script rawValue")
result.append(rawValue)
}
return result
}
}
//===----------------------------------------------------------------------===//
// Case folding
//===----------------------------------------------------------------------===//
extension Unicode.Scalar.Properties {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public var _caseFolded: String {
var buffer: (UInt32, UInt32, UInt32) = (.max, .max, .max)
withUnsafeMutableBytes(of: &buffer) {
// This is safe because the memory is already UInt32
let ptr = $0.baseAddress!.assumingMemoryBound(to: UInt32.self)
_swift_stdlib_getCaseMapping(_scalar.value, ptr)
}
var result = ""
// Max mapping is 3 scalars and the max UTF8 bytes of a scalar is 4.
result.reserveCapacity(12)
withUnsafeBytes(of: &buffer) {
for scalar in $0.bindMemory(to: UInt32.self) {
guard scalar != .max else {
break
}
result.unicodeScalars.append(Unicode.Scalar(scalar)!)
}
}
return result
}
}
//===----------------------------------------------------------------------===//
// String Word Breaking
//===----------------------------------------------------------------------===//
extension String {
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public func _wordIndex(after i: String.Index) -> String.Index {
let i = _guts.validateWordIndex(i)
let next = _guts.nextWordIndex(startingAt: i._encodedOffset)
return String.Index(_encodedOffset: next)
}
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public func _wordIndex(before i: String.Index) -> String.Index {
let i = _guts.validateInclusiveWordIndex(i)
_precondition(i > startIndex, "String index is out of bounds")
let previous = _guts.previousWordIndex(endingAt: i._encodedOffset)
return String.Index(_encodedOffset: previous)
}
@_spi(_Unicode)
@available(SwiftStdlib 5.7, *)
public func _nearestWordIndex(atOrBelow i: String.Index) -> String.Index {
_guts.validateInclusiveWordIndex(i)
}
}
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