#!perl -l
# ex: set ts=4:
use strict;
use warnings;
use HTML::Parser;
use URI;
my (@tagstack, $BUF);
sub start { # enter into tags
my ($tag, $attr, $text) = @_;
$tag .= " href" if ($tag eq "a" && defined $attr->{"href"});
push @tagstack, $tag;
output($text);
}
sub end { # escape out of tags
my ($tag, $text) = @_;
shift @tagstack while (scalar @tagstack && $tagstack[0] ne $tag);
shift @tagstack if scalar @tagstack; # actually nuke element we're
+ looking for
output($text);
}
sub text { # handle everything inside and around tags
my ($text) = @_;
if (unlinked()) {
# replace URLs with their linked equivalent if we're not withi
+n a link
$text =~ s{ \b(http://\S+) }{ "<a href=\"" . URI->new($1)->can
+onical . "\">$1</a>" }gex;
}
output($text);
}
# are we inside a link right now?
sub unlinked { return not scalar grep { /^a href$/ } @tagstack; }
# add to output buffer
sub output { $BUF .= shift @_; }
# start code
my $p = HTML::Parser->new(
"start_h" => [ \&start, "tagname, attr, text" ]
,"end_h" => [ \&end, "tagname, text" ]
,"text_h" => [ \&text, "dtext" ]
);
$p->parse(do{ local $/; <DATA> });
print $BUF;
__DATA__
<a href="">http://linked1.com</a>
<a style="" href='bob'>http://linked2.com</a>
<a href="whatever">http://linked3.com</a>
<a nolink>http://linked4.com</a>
http://unlinked1
http://unlinked2.com
$ perl no_href.pl
<a href="">http://linked1.com</a>
<a style="" href='bob'>http://linked2.com</a>
<a href="whatever">http://linked3.com</a>
<a nolink><a href="http://linked4.com/">http://linked4.com</a></a>
<a href="http://unlinked1/">http://unlinked1</a>
<a href="http://unlinked2.com/">http://unlinked2.com</a>
perl -e"\$_=qq/nwdd\x7F^n\x7Flm{{llql0}qs\x14/;s/./chr(ord$&^30)/ge;print"
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