<?php
#
#  HTML to Wiki Converter - tables
#  converts the HTML table tags into their wiki equivalents,
#  which were developed by Magnus Manske and are used in MediaWiki
#
#  Copyright (C) 2004 Borislav Manolov
#
#  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.
#  http://www.gnu.org/copyleft/gpl.html
#
#  Author: Borislav Manolov <b.manolov at web.de>
#          http://purl.oclc.org/NET/manolov/
#############################################################################


# $str - the HTML markup
# $row_delim - number of dashes used for a row
# $oneline - use one-line markup for cells - ||
function html2wiki_tables($str, $row_delim = 1, $oneline = false) {

	$str = str_replace("\r", '', $str);

	$my_nl = '=N=';
	$html_tags = array(
		# since PHP 5 str_ireplace() can be used for the end tags
		"/\n/",
		'/>\s+</',         # spaces between tags
		'/<\/table>/i',    # table end
		'/<\/caption>/i',  # caption end
		'/<\/tr>/i',       # rows end
		'/<\/th>/i',       # headers end
		'/<\/td>/i',       # cells end
		# e - replacement string gets evaluated before the replacement
		'/<table([^>]*)>/ie', # table start
		'/<caption>/i',    # caption start
		'/<tr(.*)>/Uie', # row start
		'/<th(.*)>/Uie', # header start
		'/<td(.*)>/Uie', # cell start
		"/\n$my_nl/",
		"/$my_nl/",
		"/\n */",          # spaces at beginning of a line
	);

	$wiki_tags = array(
		" \n",
		'><',        # remove spaces between tags
		"$my_nl|}",      # table end
		'', '', '', '',  # caption, rows, headers & cells end
		"'$my_nl{| '.trim(strip_newlines('$1'))",     # table start
		"$my_nl|+",      # caption
		"'$my_nl|'.str_repeat('-', $row_delim).' '.trim(strip_newlines('$1'))", # rows
		"'$my_nl! '.trim(strip_newlines('$1')).' | '", # headers
		"'$my_nl| '.trim(strip_newlines('$1')).' | '", # cells
		"\n",
		"\n",
		"\n",
	);

	# replace html tags with wiki equivalents
	$str = preg_replace($html_tags, $wiki_tags, $str);

	# remove table row after table start
	$str = preg_replace("/\{\|(.*)\n\|-+ *\n/", "{|$1\n", $str);

	# clear phase
	$s = array('!  |', '|  |', '\\"');
	$r = array('!'   , '|'   ,   '"');
	$str = str_replace($s, $r, $str);

	# use one-line markup for cells
	if ($oneline) {
		$prevcell = false; # the previous row is a table cell
		$prevhead = false; # the previous row is a table header
		$pos = -1;
		while ( ($pos = strpos($str, "\n", $pos+1)) !== false ) { #echo "\n$str\n";
		switch ($str{$pos+1}) {
			case '|': # cell start
				if ($prevcell && $str{$pos+2} == ' ') {
					$str = substr_replace($str, ' |', $pos, 1); # s/\n/ |/
				} else if ($str{$pos+2} == ' ') {
					$prevcell = true;
				} else {
					$prevcell = false;
				}
				$prevhead = false;
				break;
			case '!': # header cell start
				if ($prevhead) {
					$str = substr_replace($str, ' !', $pos, 1); # s/\n/ !/
				} else {
					$prevhead = true;
				}
				$prevcell = false;
				break;
			case '{': # possible table start
				if ($str{$pos+2} == '|') { # table start
					$prevcell = $prevhead = false;
				} else {
					$str{$pos} = ' ';
				}
				break;
			default: $str{$pos} = ' ';
		}
		}
	}
	return $str;
}

function strip_newlines($str) {
	return str_replace("\n", '', $str);
}
?>