Re^2: HELP TO WRITE THE PERL CODE

perlintro, xpather.pl , Modern Perl, ...

#!/usr/bin/perl --
##
##
##
## perltidy -olq  -csc -csci=3 -cscl="sub : BEGIN END " -otr -opr -ce 
+-nibc -i=4 -pt=0   "-nsak=*"
#!/usr/bin/perl --
use strict;
use warnings;
use XML::LibXML 1.70;    ## for load_html/load_xml/location

my( $xml ) = q{<reg><bit><init_val>0</init_val></bit><bit><init_val>0<
+/init_val></bit><bit><init_val>1</init_val></bit><bit><init_val>0</in
+it_val></bit><bit><init_val>1</init_val></bit><bit><init_val>1</init_
+val></bit><bit><init_val>0</init_val></bit><bit><init_val>0</init_val
+></bit><bit><init_val>0</init_val></bit><bit><init_val>1</init_val></
+bit><bit><init_val>0</init_val></bit><bit><init_val>0</init_val></bit
+><bit><init_val>1</init_val></bit><bit><init_val>1</init_val></bit><b
+it><init_val>0</init_val></bit><bit><init_val>0</init_val></bit></reg
+>};

RunWithIt( $xml );
exit( 0 );

sub RunWithIt {
    my $dom = XML::LibXML->new( qw/ recover 2 / )->load_xml( string =>
+ shift );
    for my $reg ( $dom->findnodes( q{   //reg     } ) ) {
        my $bitstr = FunWithIt( $reg );
        my $bytes  = BitsToBytes( $bitstr );
        print "$bitstr   The answer is $bytes\n";
    }
} ## end sub RunWithIt

sub BitsToBytes {
    return pack 'b*', shift;
} ## end sub BitsToBytes

sub FunWithIt {
    my( $reg ) = @_;
    my $str = '';
    for my $bit ( $reg->findnodes( q{  //bit      } ) ) {
        $str .= $bit->findvalue( './/init_val' );
    }
    return $str;
} ## end sub FunWithIt
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Re^3: HELP TO WRITE THE PERL CODE by achs (Initiate) on Oct 06, 2015 at 11:31 UTC
Thanks very much for the reply. I see that you have given in a variable. My input xml file is huge which I cannot copy and paste in the script. Is there a way in which I could pass the input file into the code given above and then do the processing.	[reply]
Time to read perlintro by hippo (Archbishop) on Oct 06, 2015 at 12:55 UTC
Naturally there is. The basics are covered in perlintro which also contains links to yet more extensive documentation.	[reply]
Re^4: HELP TO WRITE THE PERL CODE by Anonymous Monk on Oct 07, 2015 at 01:25 UTC
Thanks very much for the reply. I see that you have given in a variable. My input xml file is huge which I cannot copy and paste in the script. Is there a way in which I could pass the input file into the code given above and then do the processing. If you want to change this self-contained program to read xml from a filename, you need to read XML::LibXML	[reply]