Styled markdown with AttributedString #757
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| // | ||
| // Copyright © 2025 Stream.io Inc. All rights reserved. | ||
| // | ||
|
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| import Foundation | ||
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| @available(iOS 15, *) | ||
| extension AttributedStringProtocol { | ||
| func ranges<T>( | ||
| of stringToFind: T, | ||
| options: String.CompareOptions = [], | ||
| locale: Locale? = nil | ||
| ) -> [Range<AttributedString.Index>] where T: StringProtocol { | ||
| guard !characters.isEmpty else { return [] } | ||
| var ranges = [Range<AttributedString.Index>]() | ||
| var source: AttributedSubstring = self[startIndex...] | ||
| while let range = source.range(of: stringToFind, options: options, locale: locale) { | ||
| ranges.append(range) | ||
| if range.upperBound < endIndex { | ||
| source = self[range.upperBound...] | ||
| } else { | ||
| break | ||
| } | ||
| } | ||
| return ranges | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| // | ||
| // Copyright © 2025 Stream.io Inc. All rights reserved. | ||
| // | ||
|
|
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| import Foundation | ||
| import StreamChat | ||
| import SwiftUI | ||
|
|
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| /// Converts markdown string to AttributedString with styling attributes. | ||
| final class MarkdownFormatter { | ||
| @Injected(\.colors) private var colors | ||
| @Injected(\.fonts) private var fonts | ||
|
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| private let markdownParser = MarkdownParser() | ||
|
|
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| func containsMarkdown(_ string: String) -> Bool { | ||
| markdownParser.containsMarkdown(string) | ||
| } | ||
|
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| @available(iOS 15, *) | ||
| func format( | ||
| _ string: String, | ||
| attributes: AttributeContainer, | ||
| layoutDirection: LayoutDirection | ||
| ) -> AttributedString { | ||
| do { | ||
| return try markdownParser.style( | ||
| markdown: string, | ||
| options: MarkdownParser.ParsingOptions(layoutDirectionLeftToRight: layoutDirection == .leftToRight), | ||
| attributes: attributes, | ||
| inlinePresentationIntentAttributes: inlinePresentationIntentAttributes(for:), | ||
| presentationIntentAttributes: presentationIntentAttributes(for:in:) | ||
| ) | ||
| } catch { | ||
| log.debug("Failed to parse markdown with error \(error.localizedDescription)") | ||
| return AttributedString(string, attributes: attributes) | ||
| } | ||
| } | ||
|
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| // MARK: - Styling Attributes | ||
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| @available(iOS 15, *) | ||
| private func inlinePresentationIntentAttributes( | ||
| for inlinePresentationIntent: InlinePresentationIntent | ||
| ) -> AttributeContainer? { | ||
| nil // use default attributes | ||
| } | ||
|
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| @available(iOS 15, *) | ||
| private func presentationIntentAttributes( | ||
| for presentationKind: PresentationIntent.Kind, | ||
| in presentationIntent: PresentationIntent | ||
| ) -> AttributeContainer? { | ||
| switch presentationKind { | ||
| case .blockQuote: | ||
| return AttributeContainer() | ||
| .foregroundColor(Color(colors.subtitleText)) | ||
| case .codeBlock: | ||
| return AttributeContainer() | ||
| .font(fonts.body.monospaced()) | ||
| case let .header(level): | ||
| let font: Font = { | ||
| switch level { | ||
| case 1: | ||
| return fonts.title | ||
| case 2: | ||
| return fonts.title2 | ||
| case 3: | ||
| return fonts.title3 | ||
| case 4: | ||
| return fonts.headline | ||
| case 5: | ||
| return fonts.subheadline | ||
| default: | ||
| return fonts.footnote | ||
| } | ||
| }() | ||
| let foregroundColor: Color? = level >= 6 ? Color(colors.subtitleText) : nil | ||
| if let foregroundColor { | ||
| return AttributeContainer() | ||
| .font(font) | ||
| .foregroundColor(foregroundColor) | ||
| } else { | ||
| return AttributeContainer() | ||
| .font(font) | ||
| } | ||
| default: | ||
| return nil | ||
| } | ||
| } | ||
| } |
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This file's diff is pretty unreadable.
Before
After
Some things could be improved further: since now we use AttributedString always, then it could be created in init (onAppear feels unnecessary, but removing it does break tint color). Needs some investigation (probably better to be a separate PR).