Re: Print N characters per line in Cgi Script with Html Tags

[hippo]

If I understand you correctly, all you need is something like this:

#!/usr/bin/env perl 
use strict;
use warnings;

my $in = "ATATATTATATATATTATATTCGCGCGCGCGGCGCGCGCGGCGCGCGCGTTTTTTTTTTT
+TTTAGGAGAGAGAGGGAGGAGGAGAGGGGAGT";
my $out = '<pre>' . join ("\n", $in =~ /[ATCG]{1,50}/g) . "</pre>\n";
print $out;

Use HTML pre tags for preformatted output.

[Diesel]

this does not work; lines end up being of different length and the colours disappear. To simplify my task to the minimum, imagine, still inside a CGI script you have 2 strings:

my $a: "ABCDEFGHI"
my $b: "<b>ABC</b>DEFGHI"

I want to print this 2 strings with 4 characters per line and in the second string ABC has to be in bold; If I use my method, or your method, this is what I get:

$a:
ABCD
EFGH
I
$b:
<b>A
BC</
b>DE
FGHI

I want the bold tags ingored in the characters counts: So:

$a:
ABCD
EFGH
I
$b:
<b>ABC</b>D
EFGH
I

Also as I said, when I try your code it also does something with the coloured tags I used; Note: in this example I am using bold tag to make it shorter, in my scrip I am using a span class as shown. I hope it is more clear. I do not know in advance where the position it is: i need an universal solution which can print something with the same number of characters per line, basically ignoring the tags in the counts.

[hippo]

I see. If you have tags already in your data and want to skip over them then the best plan is to use a proper HTML parser.

If you cannot (or will not) use a parser then a crude plan B which works for your supplied dataset is:

#!/usr/bin/env perl 
use strict;
use warnings;
use Test::More;

my @set = (
    {
        in => 'ABCDEFGHI',
        want => "ABCD\nEFGH\nI\n"
    },
    {
        in => '<b>ABC</b>DEFGHI',
        want => "<b>ABC</b>D\nEFGH\nI\n"
    },
);
plan tests => scalar @set;
my $len = 4;

for my $x (@set) {
    my $i = 0;
    my $out = '';
    my $intag = 0;
    for my $c (split (//, $x->{in})) {
        $out .= $c;
        $intag++ if $c eq '<';
        $intag-- if $c eq '>';
        next if $intag || $c eq '>';
        $i++;
        $out .= "\n" unless $i % $len;
    }
    $out .= "\n";

    is ($out, $x->{want});
}

This isn't robust (and is rather C-ish for my taste) but it serves to illustrate this approach in general terms. Have fun with it.

Update: edited source for improved generality.