114 lines
4.0 KiB
Swift
114 lines
4.0 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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 SwiftUI
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extension String {
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/// Returns the string as an `AttributedString` with the specified character tinted in a different color.
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/// - Parameters:
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/// - character: The character to be tinted.
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/// - color: The color to tint the character. Defaults to the accent color.
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/// - Returns: An `AttributedString`.
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func tinting(_ character: Character, color: Color = .accentColor) -> AttributedString {
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var string = AttributedString(self)
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let characterView = string.characters
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for index in characterView.indices where characterView[index] == character {
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string[index..<characterView.index(after: index)].foregroundColor = color
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}
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return string
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}
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/// Calculates a numeric hash same as Element 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 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.unicodeScalars[character.unicodeScalars.startIndex].value)
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}
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return abs(hash)
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}
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var isASCII: Bool {
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allSatisfy(\.isASCII)
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}
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func asciified() -> String? {
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guard !isASCII else {
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return self
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}
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guard !canBeConverted(to: .ascii) else {
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return nil
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}
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let mutableString = NSMutableString(string: self)
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guard CFStringTransform(mutableString, nil, "Any-Latin; Latin-ASCII; [:^ASCII:] Remove" as CFString, false) else {
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return nil
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}
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return mutableString.trimmingCharacters(in: .whitespaces)
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}
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}
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extension String {
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static func generateBreakableWhitespaceEnd(whitespaceCount: Int, layoutDirection: LayoutDirection) -> String {
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guard whitespaceCount > 0 else {
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return ""
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}
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var whiteSpaces = layoutDirection.isolateLayoutUnicodeString
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// fixed size whitespace of size 1/3 em per character
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whiteSpaces += String(repeating: "\u{2004}", count: whitespaceCount)
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// braille whitespace, which is non breakable but makes previous whitespaces breakable
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return whiteSpaces + "\u{2800}"
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}
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}
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extension String {
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func ellipsize(length: Int) -> String {
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guard count > length else {
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return self
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}
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return "\(prefix(length))…"
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}
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}
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extension String {
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func replacingHtmlBreaksOccurrences() -> String {
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var result = self
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let pattern = #"</p>(\n+)<p>"#
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guard let regex = try? NSRegularExpression(pattern: pattern, options: []) else {
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return result
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}
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let matches = regex.matches(in: self, options: [], range: NSRange(location: 0, length: utf16.count))
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for match in matches.reversed() {
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guard let range = Range(match.range, in: self),
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let innerMatchRange = Range(match.range(at: 1), in: self) else {
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continue
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}
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let numberOfBreaks = (self[innerMatchRange].components(separatedBy: "\n").count - 1)
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let replacement = "<br>" + String(repeating: "<br>", count: numberOfBreaks)
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result.replaceSubrange(range, with: replacement)
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}
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return result
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}
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}
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