SwiftLint/Source/SwiftLintFramework/Extensions/String+XML.swift

extension String {
    func escapedForXML() -> String {
        // & needs to go first, otherwise other replacements will be replaced again
        let htmlEscapes = [
            ("&", "&"),
            ("\"", """),
            ("'", "'"),
            (">", ">"),
            ("<", "&lt;")
        ]
        var newString = self
        for (key, value) in htmlEscapes {
            newString = newString.replacingOccurrences(of: key, with: value)
        }
        return newString
    }
}