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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
//
//===----------------------------------------------------------------------===//
#if FOUNDATION_FRAMEWORK
@_spi(_Unicode) import Swift
internal import CoreFoundation_Private.CFString
#endif // FOUNDATION_FRAMEWORK
extension UnicodeScalar {
func _toHalfWidth() -> Self {
#if FOUNDATION_FRAMEWORK // TODO: Implement `CFUniCharCompatibilityDecompose` in Swift
if value >= 0xFF00 && value < 0xFFEF {
var halfWidth = value
CFUniCharCompatibilityDecompose(&halfWidth, 1, 1)
return UnicodeScalar(halfWidth)!
} else {
return self
}
#else
fatalError("_toHalfWidth is not implemented yet")
#endif
}
var _isGraphemeExtend: Bool {
return BuiltInUnicodeScalarSet.graphemeExtends.contains(self)
}
var _isCanonicalDecomposable: Bool {
return BuiltInUnicodeScalarSet.canonicalDecomposables.contains(self)
}
func _stripDiacritics() -> Self {
guard _isCanonicalDecomposable else {
return self
}
#if FOUNDATION_FRAMEWORK // TODO: Implement `CFUniCharDecomposeCharacter` in Swift
var stripped: UInt32? = nil
withUnsafeTemporaryAllocation(of: UTF32Char.self, capacity: 64) { ptr in
guard let base = ptr.baseAddress else {
return
}
let len = CFUniCharDecomposeCharacter(value, base, ptr.count)
if len > 0 {
if ptr[0] < 0x0510 {
stripped = ptr[0]
}
}
}
return stripped != nil ? UnicodeScalar(stripped!)! : self
#else
fatalError("_stripDiacritics is not implemented yet")
#endif // FOUNDATION_FRAMEWORK
}
var _caseFoldMapping : String {
#if FOUNDATION_FRAMEWORK // TODO: Expose Case Mapping Data without @_spi(_Unicode)
return self.properties._caseFolded
#else
fatalError("_caseFoldMapping is not implemented yet")
#endif
}
}
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