Hi,
Full code. It strips UTF-8 newlines between xhtml tags and leaves other tags
with UTF-8 newlines.
It uses Knuth-Morris-Pratt, because we can read the file only once. I need this
script because of
compatibility of a special tool.
use bytes;
use warnings;
use strict;
use XML::writer;
use IO::File;
use utf8;
print "begin whitespace trimming\n";
open FILE, "<default.xml" or die $!;
open OUTFILE, ">output.xml" or die $!;
my @xhtmlbegin = ("0x3c", "0x78", "0x68", "0x74", "0x6d", "0x6c", "0x20",
"0x78", "0x6d", "0x6c", "0x6e", "0x73", "0x3d", "0x22", "0x68", "0x74", "0x74",
"0x70", "0x3a", "0x2f", "0x2f", "0x77", "0x77", "0x77", "0x2e", "0x77", "0x33",
"0x2e", "0x6f", "0x72", "0x67", "0x2f", "0x31", "0x39", "0x39", "0x39", "0x2f",
"0x78", "0x68", "0x74", "0x6d", "0x6c", "0x22", "0x20", "0x2f", "0x3e");
my $xhtmlbeginpos = 0;
my $begintagfound = 0;
my @xhtmlend = ("0x3c", "0x2f", "0x78", "0x68", "0x74", "0x6d", "0x6c", "0x3e");
my $xhtmlendpos = 0;
my $endtagfound = 0;
my $exit1 = 0;
my $exit2 = 0;
binmode FILE;
binmode OUTFILE;
my @next = {0};
my @next2 = {0};
# initnext(@pattern, @next);
# sub initnext {
# my $i = 1;
# my $j = 0;
# while($i < (length @next) - 1) {
# if( $pattern[$i + 1] = $pattern[$j + 1] ) {
# $i = $i + 1;
# $j = $j + 1;
# $next[$i] = $j;
# #push(@next, $j);
# } else {
# if($j == 0) {
# $i = $i + 1;
# $next[$i] = 0;
# #push(@next, 0);
# } else {
# $j = $next[$j];
# }
# }
# }
# }
my $i001 = 1;
my $j001 = 0;
while($i001 < (length 0+@next) - 1) {
if( $xhtmlbegin[$i001 + 1] == $xhtmlbegin[$j001 + 1] ) {
$i001 = $i001 + 1;
$j001 = $j001 + 1;
$next[$i001] = $j001;
#push(@next, $j);
} else {
if($j001 == 0) {
$i001 = $i001 + 1;
$next[$i001] = 0;
#push(@next, 0);
} else {
$j001 = $next[$j001];
}
}
}
my $i002 = 1;
my $j002 = 0;
while($i002 < (length 0+@next2) - 1) {
if( $xhtmlend[$i002 + 1] == $xhtmlend[$j002 + 1] ) {
$i002 = $i002 + 1;
$j002 = $j002 + 1;
$next2[$i002] = $j002;
#push(@next2, $j);
} else {
if($j002 == 0) {
$i002 = $i002 + 1;
$next2[$i002] = 0;
#push(@next2, 0);
} else {
$j002 = $next2[$j002];
}
}
}
#initnext(@xhtmlbegin, @next);
#initnext(@xhtmlend, @next2);
my $i = 0; # xhtmlbegin
my $j = 0;
my $i2 = 0;
my $j2 = 0;
my $doread = 0;
my ($buf, $data, $n);
$n = read FILE, $data, 1;
$buf = $data;
while($n != 0) {
$doread = 0;
# there has to be a begin tag before the end tag
# so we can check for begin tag first
if($begintagfound == 0) {
if($buf eq chr hex $xhtmlbegin[$j + 1]) {
$doread = 1;
$j = $j + 1;
} else {
if($j == 0) {
$doread = 1;
} else {
$j = $next[$j];
}
}
} else {
if ($buf eq chr hex $xhtmlend[$j2 + 1]) {
$doread = 1;
$j2 = $j2 + 1;
} else {
if($j2 == 0) {
$doread = 1;
} else {
$j2 = $next[$j2];
}
}
}
if($j == length 0+@xhtmlbegin) {
#$k = tell(FILE) - @xhtmlbegin;
$begintagfound = 1;
print "begin tag found\n";
print OUTFILE "BEGINFOUND";
}
if($j2 == length 0+@xhtmlend) {
#$k = tell(FILE) - @xhtmlbegin;
$endtagfound = 1;
print "end tag found:" . $j2 . "==" . length 0+@xhtmlend . "\n";
print OUTFILE "ENDFOUND";
$begintagfound = 0;
}
if($doread == 1) {
$n = read FILE, $data, 1;
$buf = $data;
if($begintagfound == 1) {
# ignore 0d-s before the 0a
if($buf ne chr hex "0x0d") {
print OUTFILE $buf;
}
} else {
print OUTFILE $buf;
}
}
}
close(FILE);
close(OUTFILE);
print "end whitespace trimming\n";
-----Ursprüngliche Nachricht-----
Von: Shlomi Fish [mailto:shlo...@shlomifish.org]
Gesendet: Freitag, 3. Juli 2015 20:51
Cc: beginners@perl.org
Betreff: Re: Use of uninitialized value $j in numeric eq (==) at myfile line 125
Hi Tamas,
On Fri, 3 Jul 2015 15:10:18 +0000
"Nagy Tamas (TVI-GmbH)" <tamas.n...@tvi-gmbh.de> wrote:
> Hi,
>
> My code:
>
> Use strict;
> Use warnings;
>
> my $j = 0;
> my $doread = 0;
> my ($buf, $data, $n);
> $n = read FILE, $data, 1;
> $buf = $data;
> while($n != 0) {
>
> $doread = 0;
>
> # there has to be a begin tag before the end tag # so we can check for
> begin tag first
>
> if($begintagfound == 0) {
> if($buf eq chr hex $xhtmlbegin[$j + 1]) {
> $doread = 1;
> $j = $j + 1;
> } else {
> if($j == 0) {... line 125
> ...
>
> Says use of uninitialized value $j in numeric eq == at line 125 Does
> anyone has any idea why does it tell $j as uninitialized?
>
I don't have an idea off hand and part of the problem is that the code is
incredibly partial. Can you provide a self contained, reproducing, example?
Note that often trimming the code in an attempt to isolate the problem, can
reveal its root cause.
Regards,
Shlomi Fish
--
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