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# Copyright 2006 Lennart Borgman, http://OurComments.org/. All rights
# reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; see the file COPYING. If not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.
package html_tags;
use strict;
use vars qw($AUTOLOAD);
sub _make_attributes {
my($self,$attr) = @_;
return () unless $attr && ref($attr) && ref($attr) eq 'HASH';
my(@att);
foreach (keys %{$attr}) {
my($key) = $_;
$key=~s/^\-//; # get rid of initial - if present
#$key=~tr/a-z_/A-Z-/; # parameters are upper case, use dashes
$key=~tr/A-Z_/a-z-/; # parameters are lower case in XHTML
push(@att,defined($attr->{$_}) ? qq/$key="$attr->{$_}"/ : qq/$key/);
}
return @att;
}
sub _tag {
my $tag_name = shift;
my $part = shift;
my($attr) = '';
if (ref($_[0]) && ref($_[0]) eq 'HASH') {
my(@attr) = html_tags::_make_attributes( '',shift() );
$attr = " @attr" if @attr;
}
#return "<$tag_name$attr />" unless @_;
return "<$tag_name$attr />" if $part == 1;
return "<$tag_name$attr>" if $part == 2;
my($tag,$untag) = ("<$tag_name$attr\n>","</$tag_name\n>");
my @result = map { "$tag$_$untag" } (ref($_[0]) eq 'ARRAY') ? @{$_[0]} : "@_";
return $result[0] if $part == 1;
return "@result";
}
sub _mk_tag_sub($$) {
my $name = shift;
my $package = shift;
my $caller = caller;
my $sep = ($name =~ s/^\*//);
my $lc_name = lc $name;
my $code =
($lc_name =~ m/^(?:br|hr|input|img)$/ ?
"sub $package\:\:$name(;\$\$) { return $caller\:\:_tag('$lc_name',1,\@_); }\n"
:
"sub $package\:\:$name(\$;\$) { return $caller\:\:_tag('$lc_name',0,\@_); }\n"
);
if ($sep) {
if ($lc_name eq "html") {
$code .= "sub $package\:\:start_$name(\$;\$\$)
{return $caller\:\:_start_html(\@_);}\n";
$code .= "sub $package\:\:end_$name {return $caller\:\:_end_html();}\n";
} else {
$code .= "sub $package\:\:start_$name(;\$\$)
{return $caller\:\:_tag('$lc_name',1,\@_);}\n";
$code .= "sub $package\:\:end_$name {'</$lc_name>';}\n";
}
}
$code;
}
sub _start_html {
my $title = shift;
my $head_tags = shift;
my $body_attr = shift;
# compensate for perl laziness... (will not detect undef sub)
$head_tags = $head_tags . _tag("title", 0, $title);
my $start =
_tag("html", 2) .
_tag("head", 0, $head_tags) .
_tag("body", 2, $body_attr);
}
sub _end_html {
return '</body></html>';
}
sub header(@) {
my @lines = @_;
my $header;
my $type;
while (@lines) {
my $key = shift @lines; my $value = shift @lines;
$header .= "$key: $value\n";
$type = $value if $key =~ m/content-type/i;
}
$header .= "Content-type: text/html\n" unless defined $type;
$header .= "\n";
}
sub import {
shift;
my %exported;
$exported{$_}++ for (@_);
my $caller = caller;
my $to_eval = "package $caller;\n";
for my $name (keys %exported) {
die "Will not redefine $caller\:\:$name" if $caller->can($name);
my $func;
if ($name eq "header") {
$func = "sub header { html_tags::header(); }";
}
$func = _mk_tag_sub($name, $caller) unless defined $func;
$to_eval .= "$func\n";
}
eval $to_eval;
die $@ if $@;
}
1;
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