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//
// NSAttributedString+Markdown.swift
// MullvadVPN
//
// Created by pronebird on 19/11/2021.
// Copyright © 2021 Mullvad VPN AB. All rights reserved.
//
import UIKit
extension NSAttributedString {
enum MarkdownElement {
case bold
}
convenience init(
markdownString: String,
options: MarkdownStylingOptions,
applyEffect: ((MarkdownElement, String) -> [NSAttributedString.Key: Any])? = nil
) {
let attributedString = NSMutableAttributedString()
let paragraphs = markdownString.replacingOccurrences(of: "\r\n", with: "\n").components(separatedBy: "\n\n")
for (paragraphIndex, paragraph) in paragraphs.enumerated() {
let attributedParagraph = NSMutableAttributedString()
// Replace \n with \u2028 to prevent attributed string from picking up single line breaks as paragraphs.
let components = paragraph.replacingOccurrences(of: "\n", with: "\u{2028}")
.components(separatedBy: "**")
if paragraphIndex > 0 {
// Add single line break to add spacing between paragraphs.
attributedParagraph.append(NSAttributedString(string: "\n"))
}
for (stringIndex, string) in components.enumerated() {
var attributes: [NSAttributedString.Key: Any] = [:]
if stringIndex % 2 == 0 {
attributes[.font] = options.font
} else {
attributes[.font] = options.boldFont
attributes.merge(applyEffect?(.bold, string) ?? [:], uniquingKeysWith: { $1 })
}
attributedParagraph.append(NSAttributedString(string: string, attributes: attributes))
}
attributedString.append(attributedParagraph)
}
attributedString.addAttribute(
.paragraphStyle,
value: options.paragraphStyle,
range: NSRange(location: 0, length: attributedString.length)
)
self.init(attributedString: attributedString)
}
}
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