# Copyright (C) 2007, 2008  Alex Schroeder <alex@emacswiki.org>
#
# 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 2 of the License, 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; if not, write to the
#    Free Software Foundation, Inc.
#    59 Temple Place, Suite 330
#    Boston, MA 02111-1307 USA

$ModulesDescription .= '<p>$Id: bbcode.pl,v 1.7 2008/06/26 07:46:53 as Exp $</p>';

push(@MyRules, \&bbCodeRule);

use vars qw($bbBlock);
my %bbTitle = qw(h1 1 h2 1 h3 1 h4 1 h5 1 h6 1);

sub bbCodeRule {
  if (/\G(\[([a-z][a-z1-6]*)(?:=([^]]+))?\])/cgi) {
    my $bbcode = $1;
    my $tag = lc($2);
    my $option = $3;
    if ($tag eq 'b') { 
      return AddHtmlEnvironment('b'); }
    elsif ($tag eq 'i') { 
      return AddHtmlEnvironment('i'); }
    elsif ($tag eq 'u') {
      return AddHtmlEnvironment('em', qq{style="text-decoration: underline; }
				. qq{font-style: normal;"}); }
    elsif ($tag eq 'color') {
      return AddHtmlEnvironment('em', qq{style="color: $option; }
				. qq{font-style: normal;"}); }
    elsif ($tag eq 'size') {
      $option *= 100;
      return $bbcode unless $option; # non-numeric?
      return AddHtmlEnvironment('em', qq{style="font-size: $option%; }
				. qq{font-style: normal;"}); }
    elsif ($tag eq 'font') {
      return AddHtmlEnvironment('span', qq{style="font-family: $option;"}); }
    elsif ($tag eq 'url') {
      if ($option) {
	$option =~ /^($UrlProtocols)/o;
	my $class = "url $1";
	return AddHtmlEnvironment('a', qq{href="$option" class="$class"}); }
      elsif (/\G$FullUrlPattern\s*\[\/url\]/cogi) {
	return GetUrl($1); }}
    elsif ($tag eq 'img' and /\G$FullUrlPattern\s*\[\/img\]/cogi) {
      return GetUrl($1, undef, undef, 1); } # force image
    elsif ($tag eq 'quote') {
      my $html = CloseHtmlEnvironments();
      $html .= "</$bbBlock>" if $bbBlock;
      $html .= "<blockquote>";
      $bbBlock = 'blockquote';
      return $html . AddHtmlEnvironment('p'); }
    elsif ($tag eq 'center') {
      my $html = CloseHtmlEnvironments();
      $html .= "</$bbBlock>" if $bbBlock;
      $html .= '<div style="text-align: center">';
      $bbBlock = 'div';
      return $html . AddHtmlEnvironment('p'); }
    elsif ($tag eq 'code' and /\G((?:.*\n)*?.*?)\[\/code\](.*\n)*/cgi) {
      return CloseHtmlEnvironments() . $q->pre($1) . AddHtmlEnvironment('p'); }
    elsif ($bbTitle{$tag}) {
      return CloseHtmlEnvironments() . AddHtmlEnvironment($tag); }
    # no opening tag after all
    return $bbcode; }
  # closing tags
  elsif (/\G(\[\/([a-z][a-z1-6]*)\])/cgi) {
    my $bbcode = $1;
    my $tag = lc($2);
    %translate = qw{b b i i u em color em size em font span url a
		    quote blockquote h1 h1 h2 h2 h3 h3 h4 h4 h5 h5
		    h6 h6 center div};
    # closing a block level element closes all elements
    if ($bbBlock eq $translate{$tag}) {
      /\G([ \t]*\n)*/cg; # eat whitespace after closing block level element
      $bbBlock = undef;
      return CloseHtmlEnvironments() . "</$translate{$tag}>"
	. AddHtmlEnvironment('p'); }
    # ordinary elements just close themselves
    elsif (@HtmlStack and $HtmlStack[0] eq $translate{$tag}) {
      my $html = CloseHtmlEnvironment();
      $html .= AddHtmlEnvironment('p') unless @HtmlStack;
      return $html; }
    # no closing tag after all
    else {
      return $bbcode; }}
  # smiley
  elsif (/\G(:-?[()])/cg) {
    if (substr($1,-1) eq ')') {
      # '☺' 0009786 00263a WHITE SMILING FACE, So, 0, ON, N,
      return '&#x263a;'; }
    else {
      # '☹' 0009785 002639 WHITE FROWNING FACE, So, 0, ON, N,
      return '&#x2639;'; }}
  elsif (/\G:(?:smile|happy):/cg) {
    return '&#x263a;'; }
  elsif (/\G:(?:sad|frown):/cg) {
    return '&#x2639;'; }
  # no match
  return undef;
}