From: <ramesh.marimu...@wipro.com>
> I have a scenario where I should edit an xml file. I should change an
> element's value based on another element's value.
>
> I should change
>
> <root>
> <hosts>
> <direct_virtual_host>
> <name>RG0001_Down111</name>
> <description/>
> <administrative_state>Enabled</administrative_state>
> </host>
> </root>
>
> to
>
> <root>
> <hosts>
> <direct_virtual_host>
> <name>RG0001_Down111</name>
> <description/>
> <administrative_state>Disabled</administrative_state>
> </host>
> </root>
>
> i.e., if <name> contains a value RG0001_Down111, then the value of
> <administrative_state> should be changed as "Disabled". There are many
> occurrences like this in the same file and again the output should be
> read to another file.
#!perl
use strict;
use XML::Rules;
my $parser = XML::Rules->new(
style => 'filter',
rules => {
_default => 'raw extended',
direct_virtual_host => sub {
if ($_[1]->{':name'}{_content} eq 'RG0001_Down111') {
$_[1]->{':administrative_state'}{_content} =
'Disabled'
}
return $_[0] => $_[1];
}
}
);
$parser->filter(\*DATA, \*STDOUT);
__DATA__
<root>
<hosts>
<direct_virtual_host>
<name>RG0001_Down111</name>
<description/>
<administrative_state>Enabled</administrative_state>
</direct_virtual_host>
<direct_virtual_host>
<name>RG0001_Down159</name>
<description/>
<administrative_state>Enabled</administrative_state>
</direct_virtual_host>
</hosts>
</root>
---------------------------------------------
The good thing is that the file may well be huge, the script will not
store more than the data of a single <direct_virtual_host> in the
memory at any time.
You may also look at XML::Twig.
Jenda
===== je...@krynicky.cz === http://Jenda.Krynicky.cz =====
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