mutating func toMarkdown()

in Sources/SourceKitLSP/Swift/CommentXML.swift [74:173]
85 lines of code
21 McCabe index (conditional complexity)

  mutating func toMarkdown(_ node: XMLElement) {
    switch node.name {
    case "Declaration":
      newlineIfNeeded(count: 2)
      out += "```swift\n"
      toMarkdown(node.children)
      out += "\n```\n\n---\n"
      
    case "Name", "USR", "Direction":
      break

    case "Abstract", "Para":
      if !inParam {
        newlineIfNeeded(count: 2)
      }
      toMarkdown(node.children)

    case "Discussion", "ResultDiscussion", "ThrowsDiscussion":
      if !inParam {
        newlineIfNeeded(count: 2)
      }
      out += "### "
      switch node.name {
      case "Discussion": out += "Discussion"
      case "ResultDiscussion": out += "Returns"
      case "ThrowsDiscussion": out += "Throws"
      default: fatalError("handled in outer switch")
      }
      newline(count: 2)
      toMarkdown(node.children)

    case "Parameters":
      newlineIfNeeded(count: 2)
      out += "- Parameters:"
      indentCount += 1
      toMarkdown(node.children)
      indentCount -= 1

    case "Parameter":
      guard let name = node.elements(forName: "Name").first else { break }
      newlineIfNeeded()
      out += "- "
      toMarkdown(name.children)
      if let discussion = node.elements(forName: "Discussion").first {
        out += ": "
        inParam = true
        toMarkdown(discussion.children)
        inParam = false
      }
      // FIXME: closure parameters would go here.

    case "CodeListing":
      lineNumber = 0
      newlineIfNeeded(count: 2)
      out += "```\(node.attributes?.first(where: { $0.name == "language" })?.stringValue ?? "")\n"
      toMarkdown(node.children, separator: "\n")
      out += "```"

    case "zCodeLineNumbered":
      lineNumber += 1
      out += "\(lineNumber).\t"
      toMarkdown(node.children)

    case "codeVoice":
      out += "`"
      toMarkdown(node.children)
      out += "`"

    case "emphasis":
      out += "*"
      toMarkdown(node.children)
      out += "*"

    case "bold":
      out += "**"
      toMarkdown(node.children)
      out += "**"

    case "h1", "h2", "h3", "h4", "h5", "h6":
      newlineIfNeeded(count: 2)
      let n = Int(node.name!.dropFirst())
      out += String(repeating: "#", count: n!)
      out += " "
      toMarkdown(node.children)
      out += "\n\n"

    case "Link":
      if let href = node.attributes?.first(where: { $0.name == "href" })?.stringValue {
        out += "[" 
        toMarkdown(node.children)
        out += "](\(href))"
      } else {
        // Not a valid link.
        toMarkdown(node.children)
      }

    default:
      toMarkdown(node.children)
    }
  }