Writing formula in perl..

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September 26th, 2012, 04:48 AM

perl_zch

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Join Date: Sep 2012

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Writing formula in perl..

Hi,

I am new to perl. I am trying to parse my xml file to my script and generating an include or define file... My xml (test.xml) looks like:

Code:


<?xml version="1.0" encoding="UTF-8"?> 
<DEFINES> 
<TEST NAME="CHAIN_UNITS" VALUE="18"></TEST> 
<TEST NAME="CHIP_UNITS" VALUE="33"></TEST> 
<TEST NAME="MUX_WIDTH" VALUE="10"></TEST> 
<TEST NAME="REGISTER_LENGTH" VALUE="9"></TEST> 
<INSTANCES> 
</INSTANCES> 
<FUB></FUB> 
<POWER_DOMAIN></POWER_DOMAIN> 
<SECURITY></SECURITY> 
</DEFINES>

My perl script is as:

Code:

#perl script 
use strict; # Strict formatting 
use warnings; 
use Data::Dumper; 
use XML::XPath; 
use XML::XPath::XMLParser; 
use Getopt::Long; 
use Term::ANSIColor; 

print "Hello world\n"; 

my $out=""; 
my $length=""; 
#create an object to parse the file 
my $xp = XML::XPath->new(filename => 'test.xml'); 
my $nodeset =$xp->findnodes('/DEFINES/TEST'); 
$out.="//\n"; 
$out.="//\n"; 

foreach my $node( $nodeset->get_nodelist) 
{ 
my $namenode=$node->getAttributeNode("NAME"); 
my $name=$namenode->getValue; 
my $namelow=lc$name; 

my $valuenode=$node->getAttributeNode("VALUE"); 
my $value=$valuenode->getValue; 
my $valuelow=lc$value; 

$out.="`define $name $value\n"; 
} 

foreach my $node( $nodeset->get_nodelist) 
{ 
my $namenode=$node->getAttributeNode("NAME"); 
my $name=$namenode->getValue; 
my $namelow=lc$name; 

my $valuenode=$node->getAttributeNode("VALUE"); 
my $value=$valuenode->getValue; 
my $valuelow=lc$value; 


$sdi_length="`define BOUNDARY_LENGTH "; 
} 

my $filename="./network/defines.sv"; 
open (FILE, "> $filename") or die ("Error: could not open file $filename for writing\n"); 
print FILE $out; 
print FILE $length; 
close FILE;

The formulae for calculating BOUNDARY_LENGTH is:

BOUNDARY_LENGTH = CHAIN_UNITS*MUX_WIDTH + CHIP_UNITS*MUX_WIDTH

My question here is that, How can I plug this formula into my script so that it gives me output in the file define.sv as "`define BOUNDARY_LENGTH 510". There is no error in the above script. Kindly help me in using this formula in my script.

Thanks.

September 26th, 2012, 11:40 AM

salem

Contributed User

Join Date: Jun 2005

Posts: 3,840

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How about this (for a hint)

Code:

#!/usr/bin/perl -w
#perl script 
use strict; # Strict formatting 
use warnings; 
use Data::Dumper; 
use XML::XPath; 
use XML::XPath::XMLParser; 
use Getopt::Long; 
use Term::ANSIColor; 

my $xp = XML::XPath->new(filename => 'foo.xml'); 
my $nodeset =$xp->findnodes('/DEFINES/TEST'); 
my %symtable;

foreach my $node( $nodeset->get_nodelist) 
{ 
    my $namenode=$node->getAttributeNode("NAME"); 
    my $name=$namenode->getValue; 
    my $namelow=lc$name; 

    my $valuenode=$node->getAttributeNode("VALUE"); 
    my $value=$valuenode->getValue; 
    my $valuelow=lc$value; 

    $symtable{$namelow} = $valuelow;
} 

# BOUNDARY_LENGTH = CHAIN_UNITS*MUX_WIDTH + CHIP_UNITS*MUX_WIDTH
# <TEST NAME="CHAIN_UNITS" VALUE="18"></TEST> 
# <TEST NAME="CHIP_UNITS" VALUE="33"></TEST> 
# <TEST NAME="MUX_WIDTH" VALUE="10"></TEST> 
# <TEST NAME="REGISTER_LENGTH" VALUE="9"></TEST> 
my $answer = $symtable{"chain_units"} * $symtable{"mux_width"} +
        $symtable{"chip_units"} * $symtable{"mux_width"};
print "Answer=$answer\n";

$ perl foo.pl
Answer=510

If there is any chance at all that the input XML can be malformed, then you should guard the evaluation with a test for things like

Code:

if ( defined $symtable{"chain_units"} && defined $symtable{"mux_width"} )

__________________
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September 27th, 2012, 06:23 AM

perl_zch

Registered User

Join Date: Sep 2012

Posts: 2

Time spent in forums: 1 h 22 m 3 sec
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got it.. Thanks. It worked for me.

Writing formula in perl..

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