#!/usr/bin/perl -w
use strict;
use HTML::Parser;

use vars qw(%attribs @elements);

@attribs{qw(
    onblur onchange onclick ondblclick onfocus onkeydown onkeypress
    onkeyup onload onmousedown onmousemove onmouseout onmouseover
    onmouseup onreset onselect onsubmit onunload
)} ++;

@elements = qw( script );

my $parser = HTML::Parser->new(
    default_h       => [ sub { print shift }, 'text' ],
    start_h         => [ \&JSstrip, 'tagname, attr, attrseq' ],
    ignore_elements => \@elements,
);

if ( $ARGV[0] ) { $parser->parse_file( $ARGV[0] ); }
else            { $parser->parse_file( \*STDIN  ); }

sub JSstrip {
    my ( $tagname, $attr, $attrseq ) = @_;
    print "<$tagname";
    foreach (@$attrseq) {

        # The attribute is a script event handler
        unless ( exists $attribs{$_} ) {

            # I'm not sure if this regex is 100% reliable
            # (esp. in case of escaped quotes?)
            my $q = $attr->{$_} =~ /"/ ? "'" : '"';
            print qq' $_=$q$attr->{$_}$q';
        }
    }
    print ">";
}