(Objective-C) 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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#import <CkoXml.h>

CkoXml *xml = [[CkoXml alloc] init];
CkoXml *xSearchRoot = 0;
CkoXml *xBeginAfter = 0;
CkoXml *xFound = 0;

BOOL success = [xml LoadXmlFile: @"qa_data/xml/fruitSearch.xml"];
if (success != YES) {
    NSLog(@"%@",xml.LastErrorText);
    return;
}

// Search the sub-tree rooted at "searchRoot"
xSearchRoot = [xml FindChild: @"searchRoot"];
if (xml.LastMethodSuccess == NO) {
    NSLog(@"%@",@"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 == YES)) {

    NSLog(@"%@%@%@",xFound.Content,@": ",[xFound GetAttrValue: @"color"]);

    xBeginAfter = xFound;
    xFound = [xSearchRoot SearchForAttribute: xBeginAfter tag: @"fruit" attr: @"color" valuePattern: @"*e"];
}

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

NSLog(@"%@",@"--------------------------");

// ---------------------------------------------------------------------------------
// Now do the same, but instead use SearchForAttribute2
// which updates the internal reference of the caller instead
// of returning the found node.
CkoXml *xSearch = 0;

xBeginAfter = [xSearchRoot GetSelf];
xSearch = [xSearchRoot GetSelf];

success = [xSearch SearchForAttribute2: xBeginAfter tag: @"fruit" attr: @"color" valuePattern: @"*e"];
while (success == YES) {

    NSLog(@"%@%@%@",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"];
}