(Swift 3,4,5...) XML SearchForAttribute Method

Demonstrates the SearchForAttribute method.

The input XML, available at http://www.chilkatsoft.com/data/fruitSearch.xml, is this:

<root>
    <searchRoot>
        <fruit color="red">apple</fruit>
        <fruit color="green">pear</fruit>
        <veg color="orange">carrot</veg>
        <meat animal="cow">beef</meat>
        <xyz>
            <fruit color="blue">blueberry</fruit>
            <veg color="green">broccoli</veg>
        </xyz>
        <fruit color="purple">grape</fruit>
        <cheese color="yellow">cheddar</cheese>
    </searchRoot>
    <fruit color="red">strawberry</fruit>
    <fruit color="orange">peach</fruit>
</root>

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func chilkatTest() {
    let xml = CkoXml()!
    var xSearchRoot: CkoXml?
    var xBeginAfter: CkoXml?
    var xFound: CkoXml?

    var success: Bool = xml.loadFile("qa_data/xml/fruitSearch.xml")
    if success != true {
        print("\(xml.lastErrorText!)")
        return
    }

    // Search the sub-tree rooted at "searchRoot"
    xSearchRoot = xml.findChild("searchRoot")
    if xml.lastMethodSuccess == false {
        print("searchRoot not found, searching from root.")
        xSearchRoot = xml.getRoot()
    }

    // Search for all "fruit" nodes having a color attribute
    // where the name of the color ends in "e"
    xBeginAfter = xSearchRoot!.getSelf()
    xFound = xSearchRoot!.search(forAttribute: xBeginAfter, tag: "fruit", attr: "color", valuePattern: "*e")
    while (xSearchRoot!.lastMethodSuccess == true) {

        print("\(xFound!.content!): \(xFound!.getAttrValue("color")!)")

        xBeginAfter = nil
        xBeginAfter = xFound
        xFound = xSearchRoot!.search(forAttribute: xBeginAfter, tag: "fruit", attr: "color", valuePattern: "*e")
    }

    // The correct output is:
    // grape: purple
    // blueberry: blue

    xBeginAfter = nil

    print("--------------------------")

    // ---------------------------------------------------------------------------------
    // Now do the same, but instead use SearchForAttribute2
    // which updates the internal reference of the caller instead
    // of returning the found node.
    var xSearch: CkoXml?

    xBeginAfter = xSearchRoot!.getSelf()
    xSearch = xSearchRoot!.getSelf()

    success = xSearch!.search(forAttribute2: xBeginAfter, tag: "fruit", attr: "color", valuePattern: "*e")
    while success == true {

        print("\(xSearch!.content!): \(xSearch!.getAttrValue("color")!)")

        // Copy the internal references so that the next search
        // begins after the found node.
        xBeginAfter!.copyRef(xSearch)
        xSearch!.copyRef(xSearchRoot)

        success = xSearch!.search(forAttribute2: xBeginAfter, tag: "fruit", attr: "color", valuePattern: "*e")
    }

    xSearch = nil
    xBeginAfter = nil

    xSearchRoot = nil

}