processHTML.swift

func processHTML(_ string: String) -> NSAttributedString {
    let stringData = string.data(using: .utf8)!
    let attrString = try! NSMutableAttributedString(
        data: stringData,
        options: [.documentType: NSAttributedString.DocumentType.html],
        documentAttributes: nil
    )

    var boldRanges: [NSRange] = []
    var italicRanges: [NSRange] = []
    var regularRanges: [NSRange] = []

    attrString.enumerateAttribute(.font, in: NSRange(0..<attrString.length), options: .longestEffectiveRangeNotRequired) { value, range, pointer in
        guard let currentFont = value as? UIFont else { return }

        if currentFont.fontDescriptor.symbolicTraits.contains(.traitBold) {
            boldRanges.append(range)
        } else if currentFont.fontDescriptor.symbolicTraits.contains(.traitItalic) {
            italicRanges.append(range)
        } else {
            regularRanges.append(range)
        }
    }

    boldRanges.forEach { range in
        attrString.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.systemRed, range: range)
    }

    italicRanges.forEach { range in
        attrString.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.systemBlue, range: range)
    }

    regularRanges.forEach { range in
        attrString.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.systemGreen, range: range)
    }

    return attrString
}