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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
//
//===----------------------------------------------------------------------===//
#if canImport(FoundationEssentials)
import FoundationEssentials
#endif
extension String {
func _lowercased(with locale: Locale?) -> String {
guard let casemap = ICU.CaseMap.caseMappingForLocale(locale?.identifier), let lowered = casemap.lowercase(self) else {
return lowercased()
}
return lowered
}
func _capitalized(with locale: Locale?) -> String {
guard let casemap = ICU.CaseMap.caseMappingForLocale(locale?.identifier) else {
return capitalized
}
// Theoretically "." is a case-ignorable character, so the character after "." is not uppercased. This results in "D.c." for "D.C".
// Handle this special case by splitting the string with "." and titlecasing each substring individually.
var result = ""
try! self[...]._enumerateComponents(separatedBy: ".", options: []) { substr, isLastComponent in
result += casemap.titlecase(substr) ?? substr.capitalized
if !isLastComponent {
result += "."
}
}
return result
}
func _uppercased(with locale: Locale?) -> String {
guard let casemap = ICU.CaseMap.caseMappingForLocale(locale?.identifier), let uppered = casemap.uppercase(self) else {
return uppercased()
}
return uppered
}
}
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