(Swift 2) 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.LoadXmlFile("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!.SearchForAttribute(xBeginAfter, tag: "fruit", attr: "color", valuePattern: "*e")
    while (xSearchRoot!.LastMethodSuccess == true) {

        print("\(xFound!.Content): \(xFound!.GetAttrValue("color"))")

        xBeginAfter = nil
        xBeginAfter = xFound
        xFound = xSearchRoot!.SearchForAttribute(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!.SearchForAttribute2(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!.SearchForAttribute2(xBeginAfter, tag: "fruit", attr: "color", valuePattern: "*e")
    }

    xSearch = nil
    xBeginAfter = nil

    xSearchRoot = nil

}