96 lines
4.1 KiB
Swift
96 lines
4.1 KiB
Swift
//
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// Copyright 2025 Element Creations Ltd.
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// Copyright 2023-2025 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
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// Please see LICENSE files in the repository root for full details.
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//
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import Foundation
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extension AttributedString {
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/// faster than doing `String(characters)`: https://forums.swift.org/t/attributedstring-to-string/61667
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var string: String {
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String(characters[...])
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}
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var formattedComponents: [AttributedStringBuilderComponent] {
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var components = [AttributedStringBuilderComponent]()
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for run in runs[\.blockquote, \.codeBlock] {
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let isBlockquote = run.0 != nil
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let isCodeBlock = run.1 != nil
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var attributedString = AttributedString(self[run.2])
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// Remove trailing new lines if any
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if attributedString.characters.last?.isNewline ?? false,
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let range = attributedString.range(of: "\n", options: .backwards, locale: nil) {
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attributedString.removeSubrange(range)
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}
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let componentType: AttributedStringBuilderComponent.ComponentType = switch (isBlockquote, isCodeBlock) {
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case (true, _):
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.blockquote
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case (false, true):
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.codeBlock
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case (false, false):
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.plainText
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}
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components.append(AttributedStringBuilderComponent(id: String(attributedString.characters),
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attributedString: attributedString,
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type: componentType))
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}
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return components
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}
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/// Replaces the specified placeholder with a string that links to the specified URL.
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/// - Parameters:
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/// - linkPlaceholder: The text in the string that will be replaced. Make sure this is unique within the string.
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/// - string: The text for the link that will be substituted into the placeholder.
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/// - url: The URL that the link should open.
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mutating func replace(_ linkPlaceholder: String, with string: String, asLinkTo url: URL) {
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// Replace the placeholder with a link.
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var replacement = AttributedString(string)
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replacement.link = url
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replace(linkPlaceholder, with: replacement)
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}
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/// Replaces the specified placeholder with the supplied attributed string.
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/// - Parameters:
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/// - placeholder: The text in the string that will be replaced. Make sure this is unique within the string.
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/// - attributedString: The text for the link that will be substituted into the placeholder.
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mutating func replace(_ placeholder: String, with replacement: AttributedString) {
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guard let range = range(of: placeholder) else {
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MXLog.failure("Failed to find the placeholder to be replaced.")
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return
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}
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// Replace the placeholder.
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replaceSubrange(range, with: replacement)
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}
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/// Returns a new attributed string, created by replacing any hard coded `UIFont` with
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/// a simple presentation intent. This allows simple formatting to respond to Dynamic Type.
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///
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/// Currently only supports regular and bold weights.
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func replacingFontWithPresentationIntent() -> AttributedString {
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var newValue = self
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for run in newValue.runs {
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guard let font = run.uiKit.font else { continue }
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newValue[run.range].inlinePresentationIntent = font.fontDescriptor.symbolicTraits.contains(.traitBold) ? .stronglyEmphasized : nil
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newValue[run.range].uiKit.font = nil
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}
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return newValue
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}
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/// Makes the entire string bold by setting the presentation intent to strongly emphasized.
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///
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/// In practice, this is rendered as semibold for smaller font sizes and just so happens to nicely
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/// line up with the semibold → bold font switch used by compound.
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mutating func bold() {
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self[startIndex..<endIndex].inlinePresentationIntent = .stronglyEmphasized
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}
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}
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