70 lines
2.4 KiB
Swift
70 lines
2.4 KiB
Swift
//
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// HTMLConverter.swift
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// Tusker
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//
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// Created by Shadowfacts on 12/3/22.
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// Copyright © 2022 Shadowfacts. All rights reserved.
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//
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import UIKit
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import HTMLStreamer
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import WebURL
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import WebURLFoundationExtras
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class HTMLConverter {
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static let defaultFont = UIFont.systemFont(ofSize: 17)
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static let defaultMonospaceFont = UIFont.monospacedSystemFont(ofSize: 17, weight: .regular)
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static let defaultColor = UIColor.label
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static let defaultParagraphStyle: NSParagraphStyle = {
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let style = NSMutableParagraphStyle()
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// 2 points is enough that it doesn't make things look weirdly spaced out, but leaves a slight gap when there are multiple lines of emojis
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style.lineSpacing = 2
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return style
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}()
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private var converter: AttributedStringConverter<Callbacks>
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init(font: UIFont, monospaceFont: UIFont, color: UIColor, paragraphStyle: NSParagraphStyle) {
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let config = AttributedStringConverterConfiguration(font: font, monospaceFont: monospaceFont, color: color, paragraphStyle: paragraphStyle)
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self.converter = AttributedStringConverter(configuration: config)
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}
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func convert(_ html: String) -> NSAttributedString {
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converter.convert(html: html)
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}
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}
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extension HTMLConverter {
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struct Callbacks: HTMLConversionCallbacks {
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static func makeURL(string: String) -> URL? {
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// Converting WebURL to URL is a small but non-trivial expense (since it works by
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// serializing the WebURL as a string and then having Foundation parse it again),
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// so, if available, use the system parser which doesn't require another round trip.
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if #available(iOS 16.0, macOS 13.0, *),
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let url = try? URL.ParseStrategy().parse(string) {
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url
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} else if let web = WebURL(string),
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let url = URL(web) {
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url
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} else {
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URL(string: string)
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}
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}
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static func elementAction(name: String, attributes: [Attribute]) -> ElementAction {
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guard name == "span" else {
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return .default
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}
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let clazz = attributes.attributeValue(for: "class")
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if clazz == "invisible" {
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return .skip
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} else if clazz == "ellipsis" {
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return .append("…")
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} else {
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return .default
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}
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}
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}
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}
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