79 lines
2.6 KiB
Swift
79 lines
2.6 KiB
Swift
/*
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Copyright 2019 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import Foundation
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extension String {
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private enum Constants {
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static let RTLOverrideChar: String = "\u{202E}"
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}
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/// Calculates a numeric hash same as Riot Web
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/// See original function here https://github.com/matrix-org/matrix-react-sdk/blob/321dd49db4fbe360fc2ff109ac117305c955b061/src/utils/FormattingUtils.js#L47
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var vc_hashCode: Int32 {
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var hash: Int32 = 0
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for character in self {
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let shiftedHash = hash << 5
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hash = shiftedHash.subtractingReportingOverflow(hash).partialValue + Int32(character.vc_unicodeScalarCodePoint)
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}
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return abs(hash)
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}
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/// Locale-independent case-insensitive contains
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/// Note: Prefer use `localizedCaseInsensitiveContains` when locale matters
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///
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/// - Parameter other: The other string.
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/// - Returns: true if current string contains other string.
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func vc_caseInsensitiveContains(_ other: String) -> Bool {
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return self.range(of: other, options: .caseInsensitive) != nil
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}
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/// Returns a globally unique string
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static var vc_unique: String {
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return ProcessInfo.processInfo.globallyUniqueString
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}
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/// Returns a new string by removing all whitespaces from the receiver object
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/// - Returns: New string without whitespaces from the receiver
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func vc_removingAllWhitespaces() -> String {
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return components(separatedBy: .whitespaces).joined()
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}
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/// Returns if the string contains an RTL override character
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func vc_containsRTLOverride() -> Bool {
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return contains(Constants.RTLOverrideChar)
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}
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/// Returns a new string which is reversed of the receiver
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func vc_reversed() -> String {
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return String(self.reversed())
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}
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/// Returns nil if the string is empty or the string itself otherwise
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func vc_nilIfEmpty() -> String? {
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isEmpty ? nil : self
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}
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}
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extension Optional where Wrapped == String {
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var isEmptyOrNil: Bool {
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return self?.isEmpty ?? true
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}
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}
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