SWXMLHash parse Data object

Question

I trying out with SWXMLHash and to mock a download from a website to parse, I created a file in the playground with the data. I got this as the response from URLSessionManager Data looks similar to:

3c3f786d 6c207665 7273696f 6e3d2731 ...

But of course much longer.

I read it in as follows:

guard let fileURL = Bundle.main.url(forResource: "xmlData", withExtension: "")
    else { fatalError("cannot load file")}
do {
    let xmlData = try Data(contentsOf: fileURL, options: .mappedIfSafe)
} catch {
    print(error)
}

This works I think, there is no error and if I print the data it returns 169735 bytes.

Then I try to parse it (inside the do block):

let xml = SWXMLHash.parse(xmlData)
print(xml)

This returns \n, so no output.

SWXMLHash provides a method that accepts a Data object. How can I get this to work?

Answer 1

According to SWXMLHash

public func parse(_ xml: String) -> XMLIndexer {
    guard let data = xml.data(using: options.encoding) else {
        return .xmlError(.encoding)
    }
    return parse(data)
}

public func parse(_ data: Data) -> XMLIndexer {
    let parser: SimpleXmlParser = options.shouldProcessLazily
        ? LazyXMLParser(options)
        : FullXMLParser(options)
    return parser.parse(data)
}

Whereas you give a String or a Data object, internally it will parse a Data object doing a conversion if needed. It's a safe way of coding, this way all initialization methods pass through the same one, and fixing it fix all the different initialization.

So it should work.

Your issue is that you file is a string representation of HexData, not a RawHexData file.
The solution is to put in that file the XML String instead.

The Data(contentsOf: fileURL, options: .mappedIfSafe) will convert that XML String into a Hex representation of it. And then it will work.