globulus/HTMLText.swift

## HTMLText.swift
// full recipe at https://swiftuirecipes.com/blog/swiftui-text-with-html-via-nsattributedstring
extension Text {
    init(html htmlString: String,
         raw: Bool = false,
         size: CGFloat? = nil,
         fontFamily: String = "-apple-system") {
        let fullHTML: String
        if raw {
            fullHTML = htmlString
        } else {
            var sizeCss = ""
            if let size = size {
                sizeCss = "font-size: \(size)px;"
            }
            fullHTML = """
            <!doctype html>
            <html>
              <head>
                <style>
                  body {
                    font-family: \(fontFamily);
                    \(sizeCss)
                  }
                </style>
              </head>
              <body>
                \(htmlString)
              </body>
            </html>
            """
        }
        let attributedString: NSAttributedString
        if let data = fullHTML.data(using: .unicode),
           let attrString = try? NSAttributedString(data: data,
                                                    options: [.documentType: NSAttributedString.DocumentType.html],
                                                    documentAttributes: nil) {
            attributedString = attrString
        } else {
            attributedString = NSAttributedString()
        }

        self.init(attributedString)
    }

    init(_ attributedString: NSAttributedString) {
        self.init("")

        attributedString.enumerateAttributes(in: NSRange(location: 0, length: attributedString.length), options: []) { (attrs, range, _) in
            let string = attributedString.attributedSubstring(from: range).string
            var text = Text(string)

            if let font = attrs[.font] as? UIFont {
                text = text.font(.init(font))
            }

            if let color = attrs[.foregroundColor] as? UIColor {
                text = text.foregroundColor(Color(color))
            }

            if let kern = attrs[.kern] as? CGFloat {
                text = text.kerning(kern)
            }

            if #available(iOS 14.0, *) {
                if let tracking = attrs[.tracking] as? CGFloat {
                    text = text.tracking(tracking)
                }
            }

            if let strikethroughStyle = attrs[.strikethroughStyle] as? NSNumber, strikethroughStyle != 0 {
                if let strikethroughColor = (attrs[.strikethroughColor] as? UIColor) {
                    text = text.strikethrough(true, color: Color(strikethroughColor))
                } else {
                    text = text.strikethrough(true)
                }
            }

            if let underlineStyle = attrs[.underlineStyle] as? NSNumber,
               underlineStyle != 0 {
                if let underlineColor = (attrs[.underlineColor] as? UIColor) {
                    text = text.underline(true, color: Color(underlineColor))
                } else {
                    text = text.underline(true)
                }
            }

            if let baselineOffset = attrs[.baselineOffset] as? NSNumber {
                text = text.baselineOffset(CGFloat(baselineOffset.floatValue))
            }

            self = self + text
        }
    }
}
	// full recipe at https://swiftuirecipes.com/blog/swiftui-text-with-html-via-nsattributedstring
	extension Text {
	init(html htmlString: String,
	raw: Bool = false,
	size: CGFloat? = nil,
	fontFamily: String = "-apple-system") {
	let fullHTML: String
	if raw {
	fullHTML = htmlString
	} else {
	var sizeCss = ""
	if let size = size {
	sizeCss = "font-size: \(size)px;"
	}
	fullHTML = """
	<!doctype html>
	<html>
	<head>
	<style>
	body {
	font-family: \(fontFamily);
	\(sizeCss)
	}
	</style>
	</head>
	<body>
	\(htmlString)
	</body>
	</html>
	"""
	}
	let attributedString: NSAttributedString
	if let data = fullHTML.data(using: .unicode),
	let attrString = try? NSAttributedString(data: data,
	options: [.documentType: NSAttributedString.DocumentType.html],
	documentAttributes: nil) {
	attributedString = attrString
	} else {
	attributedString = NSAttributedString()
	}

	self.init(attributedString)
	}

	init(_ attributedString: NSAttributedString) {
	self.init("")

	attributedString.enumerateAttributes(in: NSRange(location: 0, length: attributedString.length), options: []) { (attrs, range, _) in
	let string = attributedString.attributedSubstring(from: range).string
	var text = Text(string)

	if let font = attrs[.font] as? UIFont {
	text = text.font(.init(font))
	}

	if let color = attrs[.foregroundColor] as? UIColor {
	text = text.foregroundColor(Color(color))
	}

	if let kern = attrs[.kern] as? CGFloat {
	text = text.kerning(kern)
	}

	if #available(iOS 14.0, *) {
	if let tracking = attrs[.tracking] as? CGFloat {
	text = text.tracking(tracking)
	}
	}

	if let strikethroughStyle = attrs[.strikethroughStyle] as? NSNumber, strikethroughStyle != 0 {
	if let strikethroughColor = (attrs[.strikethroughColor] as? UIColor) {
	text = text.strikethrough(true, color: Color(strikethroughColor))
	} else {
	text = text.strikethrough(true)
	}
	}

	if let underlineStyle = attrs[.underlineStyle] as? NSNumber,
	underlineStyle != 0 {
	if let underlineColor = (attrs[.underlineColor] as? UIColor) {
	text = text.underline(true, color: Color(underlineColor))
	} else {
	text = text.underline(true)
	}
	}

	if let baselineOffset = attrs[.baselineOffset] as? NSNumber {
	text = text.baselineOffset(CGFloat(baselineOffset.floatValue))
	}

	self = self + text
	}
	}
	}