#!/usr/bin/perl --
use strict;
use warnings;
use HTML::TreeBuilder::XPath;
Main(@ARGV);
exit(0);
sub Main {
my $html = '
';
my $tree = HTML::TreeBuilder::XPath->new();
$tree->parse($html);
local $\ = $/;
print $_->as_HTML for $tree->findnodes('//img[not(@alt)]');
print '---';
print $_->as_HTML for $tree->findnodes('//img[not(string-length(@alt))]');
print '---';
$_->attr( alt => MAlt($_) )
for $tree->findnodes('//img[not(string-length(@alt))]');
print $_->as_HTML for $tree->findnodes('//img');
} ## end sub Main
sub MAlt { '!' . $_[0]->attr('src') }
__END__