(Ruby) 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>

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

xml = Chilkat::CkXml.new()

success = xml.LoadXmlFile("qa_data/xml/fruitSearch.xml")
if (success != true)
    print xml.lastErrorText() + "\n";
    exit
end

# Search the sub-tree rooted at "searchRoot"
# xSearchRoot is a CkXml
xSearchRoot = xml.FindChild("searchRoot")
if (xml.get_LastMethodSuccess() == false)
    print "searchRoot not found, searching from root." + "\n";
    # xSearchRoot is a CkXml
    xSearchRoot = xml.GetRoot()
end

# Search for all "fruit" nodes having a color attribute
# where the name of the color ends in "e"
# xBeginAfter is a CkXml
xBeginAfter = xSearchRoot.GetSelf()
# xFound is a CkXml
xFound = xSearchRoot.SearchForAttribute(xBeginAfter,"fruit","color","*e")
while (xSearchRoot.get_LastMethodSuccess() == true)

    print xFound.content() + ": " + xFound.getAttrValue("color") + "\n";

    # xBeginAfter is a CkXml
    xBeginAfter = xFound
    # xFound is a CkXml
    xFound = xSearchRoot.SearchForAttribute(xBeginAfter,"fruit","color","*e")
end

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

print "--------------------------" + "\n";

# ---------------------------------------------------------------------------------
# Now do the same, but instead use SearchForAttribute2
# which updates the internal reference of the caller instead
# of returning the found node.

# xBeginAfter is a CkXml
xBeginAfter = xSearchRoot.GetSelf()
# xSearch is a CkXml
xSearch = xSearchRoot.GetSelf()

success = xSearch.SearchForAttribute2(xBeginAfter,"fruit","color","*e")
while success == true

    print xSearch.content() + ": " + xSearch.getAttrValue("color") + "\n";

    # Copy the internal references so that the next search
    # begins after the found node.
    xBeginAfter.CopyRef(xSearch)
    xSearch.CopyRef(xSearchRoot)

    success = xSearch.SearchForAttribute2(xBeginAfter,"fruit","color","*e")
end