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Create an XML tree using perl

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Top Forums Shell Programming and Scripting Create an XML tree using perl
# 8  
Old 04-29-2011
Quote:
Originally Posted by pravin27
Perl code,
Code:
#!/usr/bin/perl
open(FH,"<","student.xml") or die "Failure- $!\n";
while(<FH>) {
chomp;
if(/<Nodename>(.+?)<\/Nodename>/) {$nodename=$1;}
if(/<Filename>(.+?)<\/Filename>/) {$filename=$1;}
if(/<DataFile>(.+?)<\/DataFile>/) {$datafile=$1;}
}
close(FH);
open(ST,"<",$filename) or die "Failure- $!\n";
open(DT,"<",$datafile) or die "Failure- $!\n";

$file=<ST>;
chomp($file);
@flds=split(",",$file);

while(<DT>) {
chomp;
print "<",$nodename,">\n";
@data=split(",");
for($i=0;$i<=$#data;$i++) {
print "<",$flds[$i],">",$data[$i],"</",$flds[$i],">\n";
}
print "</",$nodename,">\n";
}
close(ST);
close(DT);

Hi,

Thanks for the quick reply.

But i have one question here if the xml node has dummy node with out any node name... some thing like this:
Code:
<Node>
<Nodename>dummy</Nodename>
<filenames>file1.txt</filenames>
<datafiles>1.csc </datafiles>

In that case the above code how will it handle and along with the attributes and the node level can be more.

Forexample for attributes:
Code:
 
student fees:code
In xml it would be
<student fees="USD">23</student fees>

How to handle this?

does sax parser helps with this?

How can i handle it?

Regards
vanitha
# 9  
Old 04-29-2011
If you are up to PERL, use a real SAX parser: PERL XML SAX Parser - Google Search

SAX is serial parsing, best for batch with potentially huge files. (The alternative, DOM, puts the entire XML file in memory as an object tree, impossible for bulk and for serial transmissions in real time.) It calls you as it traverses tags (elements), gives you direct access to attributes in and content after the start tag. It is up to you to manage state variables for where in the nesting you are.

In JAVA, I created a reusable object tree that reflected the XML syntax tree, with an abstract class to support an interface to support building classes for each type of element. PERL can probably do something similar. The PERL XML SAX lib probably has dictionary correctness checking as well, although I turned that off for speed and robustness and did my own validation.
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