Perl

XML SearchForAttribute Method

See more XML Examples

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>

Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

my $xml = Chilkat2::Xml->new;

my $success = $xml->LoadXmlFile('qa_data/xml/fruitSearch.xml');
if (!$success) {
    print $xml->LastErrorText, "\n";
    exit;
}

# Search the sub-tree rooted at "searchRoot";
my $xSearchRoot = $xml->FindChild('searchRoot');
if (!$xml->LastMethodSuccess) {
    print "searchRoot not found, searching from root.\n";
    $xSearchRoot = $xml->GetRoot();
}

# Search for all "fruit" nodes having a color attribute
# where the name of the color ends in "e";
my $xBeginAfter = $xSearchRoot->GetSelf();
my $xFound = $xSearchRoot->SearchForAttribute($xBeginAfter, 'fruit', 'color', '*e');
while ($xSearchRoot->LastMethodSuccess) {
    print $xFound->Content, ': ', $xFound->GetAttrValue('color'), "\n";

    $xBeginAfter = $xFound;
    $xFound = $xSearchRoot->SearchForAttribute($xBeginAfter, 'fruit', 'color', '*e');
}

# 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 = $xSearchRoot->GetSelf();
my $xSearch = $xSearchRoot->GetSelf();

$success = $xSearch->SearchForAttribute2($xBeginAfter, 'fruit', 'color', '*e');
while ($success) {
    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');
}