(PureBasic) Traverse Direct Children via FirstChild / NextSibling, or LastChild / PreviousSibling

Demonstrates some ways to iterate over direct child nodes using the FirstChild / NextSibling and LastChild / PreviousSibling methods.

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

<root>
    <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>
</root>

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkXml.pb"

Procedure ChilkatExample()

    xml.i = CkXml::ckCreate()
    If xml.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    child.i
    nextSibling.i
    prevSibling.i

    success.i = CkXml::ckLoadXmlFile(xml,"qa_data/xml/fruit.xml")
    If success <> 1
        Debug CkXml::ckLastErrorText(xml)
        CkXml::ckDispose(xml)
        ProcedureReturn
    EndIf

    ; Iterate over the direct children by using FirstChild / NextSibling
    child = CkXml::ckFirstChild(xml)
    bContinue.i = CkXml::ckLastMethodSuccess(xml)
    While (bContinue = 1)
        Debug CkXml::ckTag(child) + " : " + CkXml::ckContent(child)
        nextSibling = CkXml::ckNextSibling(child)
        bContinue = CkXml::ckLastMethodSuccess(child)
        CkXml::ckDispose(child)

        child = nextSibling
    Wend
    Debug "-----"

    ; Do the same, but with FirstChild2 / NextSibling2 to avoid
    ; creating so many XML object instances:
    success = CkXml::ckFirstChild2(xml)
    While success = 1
        Debug CkXml::ckTag(xml) + " : " + CkXml::ckContent(xml)
        success = CkXml::ckNextSibling2(xml)
    Wend
    ; Revert back up to the parent:
    success = CkXml::ckGetParent2(xml)

    Debug "-----"

    ; Iterate in reverse order using LastChild / PreviousSibling
    child = CkXml::ckLastChild(xml)
    bContinue = CkXml::ckLastMethodSuccess(xml)
    While (bContinue = 1)
        Debug CkXml::ckTag(child) + " : " + CkXml::ckContent(child)
        prevSibling = CkXml::ckPreviousSibling(child)
        bContinue = CkXml::ckLastMethodSuccess(child)
        CkXml::ckDispose(child)

        child = prevSibling
    Wend
    Debug "-----"

    ; Do the same, but with LastChild2 / PreviousSibling2 to avoid
    ; creating so many XML object instances:
    success = CkXml::ckLastChild2(xml)
    While success = 1
        Debug CkXml::ckTag(xml) + " : " + CkXml::ckContent(xml)
        success = CkXml::ckPreviousSibling2(xml)
    Wend
    ; Revert back up to the parent:
    success = CkXml::ckGetParent2(xml)


    CkXml::ckDispose(xml)


    ProcedureReturn
EndProcedure