Puranjay Savar Mattas
6e1ffb96fd
Convert from git submodule to plain vendored copy. No push access to upstream nodes-app/swift-markdown-engine meant our local fix commit (05c1720) was stranded and unreachable from any remote on fresh clones/CI. Vendoring as plain files folds it into normal repo history instead.
64 lines
2.0 KiB
Swift
64 lines
2.0 KiB
Swift
//
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// ContainerExtension.swift
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// MarkdownEngine
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//
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// Created by Luca Chen on 15.07.26.
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//
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// `:::` fenced container as the first block extension. Not registered by
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// default — the core engine parses pure markdown; embedders opt in via:
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//
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// configuration.extensions = [ContainerExtension()]
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//
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// Syntax:
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//
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// ::: note
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// Body text with **inline** markdown.
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// :::
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//
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// The fence lines hide while the caret is outside the block and reveal
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// muted while editing (mirroring code fences); the body keeps full inline
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// styling plus the container background. An unclosed container runs to the end
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// of the document (unlike an unclosed ``` fence, which stays literal text
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// until its closing fence exists).
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//
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import AppKit
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import Foundation
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public struct ContainerExtension: MarkdownExtension {
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/// Well-known id.
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public static let identifier = "container"
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/// Background tint applied to the container block.
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public var backgroundColor: NSColor
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/// The default resolves per appearance: `withAlphaComponent` on a dynamic
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/// system color FREEZES it (same gotcha the table renderer documents), so
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/// the tint is rebuilt inside a dynamic provider and keeps tracking
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/// light/dark mode.
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public init(backgroundColor: NSColor = NSColor(name: nil) { appearance in
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var resolved = NSColor.systemBlue
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appearance.performAsCurrentDrawingAppearance {
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resolved = NSColor.systemBlue.usingColorSpace(.sRGB) ?? .systemBlue
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}
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return resolved.withAlphaComponent(0.12)
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}) {
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self.backgroundColor = backgroundColor
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}
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public var id: String { Self.identifier }
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public var block: BlockSyntax? {
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BlockSyntax(fence: ":::")
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}
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public func contentAttributes(theme: MarkdownEditorTheme) -> [NSAttributedString.Key: Any] {
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[.backgroundColor: backgroundColor]
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}
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public func html(childrenHTML: String) -> String {
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"<blockquote>\(childrenHTML)</blockquote>"
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}
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}
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