问题
Simple xml file cr.xml
<book_reviewers>
<results>
<reviewer>
<name>Anne</name>
<profession>Catfish wrangler</profession>
</reviewer>
<reviewer>
<name>Bob</name>
<profession>Beer taster</profession>
</reviewer>
<reviewer>
<name>Charlie</name>
<profession>Gardener</profession>
</reviewer>
</results>
</book_reviewers>
I want to loop through each reviewer and replace the name with a new one
I am not trying to use both these methods, but going by other posts in the form both of these should work but I keep getting errors:
Can't locate object method "setData"
Can't locate object method "removeChildNodes
Can't locate object method "appendText"
#!/usr/bin/perl -w
use strict;
use XML::LibXML;
my $critics_file = "cr.xml";
my $parser = new XML::LibXML;
print "Couldn't retrieve review details\n"
unless my $book_reviews = $parser->parse_file($reviews_file);
foreach my $critics ($critic_details->findnodes('/book_reviewers/results/reviewer')) {
my $value = $critics->findvalue('name'); #returns the correct name
$value->removeChildNodes();
$value->appendText('new_name');
##ONLY EITHER THE ABOVE METHOD OR THE ONE BELOW - NOT BOTH
my $node = $critics->findnodes('.//name.text()');#returns the correct name
$node->setData('new_name');
}
Can anyone see where I am going wrong?
Cheers
回答1:
Trying to get you into TIMTOWTDI, here is another example with more compact code:
You can find all the <name>…</name>
elements directly, and you can iterate over them immediately, using the 'default' variable $_
.
use strict;
use warnings;
use utf8;
use XML::LibXML;
my $filename = "cr.xml";
my $parser = XML::LibXML->new();
my $critic_details = $parser->parse_file("$filename") or die;
my $new_name = "new_name";
# find ALL the <book_reviewers><results><reviewers><name> nodes
foreach ($critic_details
->findnodes("book_reviewers/results/reviewer/name")
) {
$_->removeChildNodes();
$_->appendText($new_name);
}
use XML::LibXML::PrettyPrint;
my $pretty = XML::LibXML::PrettyPrint->new(
indent_string =>' ' x4,
element => {
compact => [qw| name profession |],
}
);
$pretty->pretty_print($critic_details);
print $critic_details->toString;
__END__
enjoy!
回答2:
The problem is that this call
my $value = $critics->findvalue('name')
returns the string content of the name
element, and you are trying to treat it as an XML::LibXML::Element
object.
Just change the method call to
my ($value) = $critics->findnodes('name')
and all should be well.
Here is a working version of your program.
#!/usr/bin/perl
use strict;
use warnings;
use XML::LibXML;
my $reviews_file = 'cr.xml';
my $parser = XML::LibXML->new;
my $doc = $parser->parse_file($reviews_file) or die "Couldn't parse book reviewers\n";
for my $reviewer ($doc->findnodes('/book_reviewers/results/reviewer')) {
my ($name) = $reviewer->findnodes('name');
$name->removeChildNodes;
$name->appendText('new_name');
}
print $doc->toString;
output
<?xml version="1.0"?>
<book_reviewers>
<results>
<reviewer>
<name>new_name</name>
<profession>Catfish wrangler</profession>
</reviewer>
<reviewer>
<name>new_name</name>
<profession>Beer taster</profession>
</reviewer>
<reviewer>
<name>new_name</name>
<profession>Gardener</profession>
</reviewer>
</results>
</book_reviewers>
回答3:
Solution using XML::LibXML
The following directly accesses the Text Node to simply and easily change the enclosed text:
#!/usr/bin/perl
use strict;
use warnings;
use XML::LibXML;
my $doc = XML::LibXML->load_xml( IO => \*DATA );
for my $text ( $doc->findnodes('//reviewer/name/text()') ) {
$text->setData('new_name');
}
print $doc->toString;
__DATA__
<book_reviewers>
<results>
<reviewer>
<name>Anne</name>
<profession>Catfish wrangler</profession>
</reviewer>
<reviewer>
<name>Bob</name>
<profession>Beer taster</profession>
</reviewer>
<reviewer>
<name>Charlie</name>
<profession>Gardener</profession>
</reviewer>
</results>
</book_reviewers>
Solution using XML::Twig
Takes the name of each reviewer and just reverses them:
use strict;
use warnings;
use XML::Twig;
my $t= XML::Twig->new(
twig_handlers => {
q{//reviewer/name} => sub { $_->set_text(scalar reverse $_->text()) },
},
pretty_print => 'indented',
);
$t->parse( do { local $/; <DATA> } );
$t->print;
__DATA__
<book_reviewers>
<results>
<reviewer>
<name>Anne</name>
<profession>Catfish wrangler</profession>
</reviewer>
<reviewer>
<name>Bob</name>
<profession>Beer taster</profession>
</reviewer>
<reviewer>
<name>Charlie</name>
<profession>Gardener</profession>
</reviewer>
</results>
</book_reviewers>
Outputs:
<book_reviewers>
<results>
<reviewer>
<name>ennA</name>
<profession>Catfish wrangler</profession>
</reviewer>
<reviewer>
<name>boB</name>
<profession>Beer taster</profession>
</reviewer>
<reviewer>
<name>eilrahC</name>
<profession>Gardener</profession>
</reviewer>
</results>
</book_reviewers>
回答4:
my $value = $critics->findvalue('name'); #returns the correct name
$value->removeChildNodes();
$value->appendText('new_name');
$value
is a simple scalar that holds the text of the found xml-element <name>…</name>
. You can not call any of those methods on a 'string', can you?
来源:https://stackoverflow.com/questions/23733255/perl-xmllibxml-replace-text