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.
84 lines
3.0 KiB
Swift
84 lines
3.0 KiB
Swift
//
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// MarkdownToken.swift
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// MarkdownEngine
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//
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// Created by Luca Chen on 18.02.26.
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//
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// Defines the basic Markdown building blocks the editor works with (bold,
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// links, code, LaTeX, etc.), plus shared text attributes.
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import AppKit
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import Foundation
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extension NSAttributedString.Key {
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public static let wikiLinkID = NSAttributedString.Key("NodeLinkID")
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public static let taskCheckbox = NSAttributedString.Key("TaskCheckbox")
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}
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enum MarkdownTokenKind: Equatable {
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case italic
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case boldItalic
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case bold
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case link
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case wikiLink
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case heading
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/// One blockquote line; `markerRanges[0]` is the `>` run, nesting = count of `>`.
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case blockquote
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case codeBlock
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case inlineCode
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case blockLatex
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case inlineLatex
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case imageEmbed
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case imageLink
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case table
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/// A CommonMark backslash escape; marker is the `\`, content the escaped literal char.
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case backslashEscape
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/// A span contributed by a registered `MarkdownExtension`,
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/// carrying the extension's id (e.g. `.extensionSpan("highlight")`).
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case extensionSpan(String)
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/// A fenced block contributed by a registered `MarkdownExtension`,
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/// carrying the extension's id (e.g. `.extensionBlock("container")`).
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case extensionBlock(String)
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}
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struct MarkdownToken {
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let kind: MarkdownTokenKind
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let range: NSRange
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let contentRange: NSRange
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let markerRanges: [NSRange]
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}
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extension MarkdownToken {
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func standaloneParagraphRange(in text: NSString) -> NSRange? {
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let paragraphRange = text.paragraphRange(for: range)
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let paragraphText = text.substring(with: paragraphRange) as NSString
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let tokenRelativeRange = NSRange(
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location: range.location - paragraphRange.location,
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length: range.length
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)
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let mutableParagraph = paragraphText.mutableCopy() as! NSMutableString
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mutableParagraph.replaceCharacters(in: tokenRelativeRange, with: "")
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return mutableParagraph.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty ? paragraphRange : nil
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}
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func containsSelectionOrStandaloneParagraph(_ selectionLocation: Int, in text: NSString) -> Bool {
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let start = range.location
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let end = NSMaxRange(range) - 1
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if selectionLocation >= start && selectionLocation <= end {
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return true
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}
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guard let paragraphRange = standaloneParagraphRange(in: text) else {
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return false
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}
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let paragraphEnd = NSMaxRange(paragraphRange)
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// Reveal source when caret is at document end right after the image, unless that line ends in a newline.
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let endsWithNewline = paragraphEnd > paragraphRange.location
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&& (text.character(at: paragraphEnd - 1) == 0x0A || text.character(at: paragraphEnd - 1) == 0x0D)
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let isAtLastParagraphEnd = selectionLocation == text.length
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&& paragraphEnd == text.length && !endsWithNewline
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return (selectionLocation >= paragraphRange.location && selectionLocation < paragraphEnd)
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|| isAtLastParagraphEnd
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}
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}
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