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<?php
/**
* DirectionDetector plugin, detects notices with RTL content & sets RTL
* style for them.
*
* 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 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, see <http://www.gnu.org/licenses/>.
*
* @category Plugin
* @package StatusNet
* @author Behrooz shabani (everplays) - <behrooz@rock.com>
* @copyright 2009-2010 Behrooz shabani
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
*
*/
if (!defined('STATUSNET')) {
exit(1);
}
define('DIRECTIONDETECTORPLUGIN_VERSION', '0.1.1');
class DirectionDetectorPlugin extends Plugin {
/**
* SN plugin API, here we will make changes on rendered column
*
* @param object $notice notice is going to be saved
*/
public function onStartNoticeSave(&$notice){
if(!preg_match('/<span class="rtl">/', $notice->rendered) && self::isRTL($notice->content))
$notice->rendered = '<span class="rtl">'.$notice->rendered.'</span>';
return true;
}
/**
* SN plugin API, here we will add css needed for modifiyed rendered
*
* @param
*/
public function onEndShowStatusNetStyles($xml){
$xml->element('style', array('type' => 'text/css'), 'span.rtl {display:block;direction:rtl;text-align:right;float:right;width:490px;} .notice .author {float:left}');
}
/**
* checks that passed string is a RTL language or not
*
* @param string $str string to be checked
*/
public static function isRTL($str){
self::getClearText($str);
if( is_array($cc = self::utf8ToUnicode(mb_substr($str, 0, 1, 'utf-8'))) )
$cc = $cc[0];
else
return false;
if($cc>=1536 && $cc<=1791) // arabic, persian, urdu, kurdish, ...
return true;
if($cc>=65136 && $cc<=65279) // arabic peresent 2
return true;
if($cc>=64336 && $cc<=65023) // arabic peresent 1
return true;
if($cc>=1424 && $cc<=1535) // hebrew
return true;
if($cc>=64256 && $cc<=64335) // hebrew peresent
return true;
if($cc>=1792 && $cc<=1871) // Syriac
return true;
if($cc>=1920 && $cc<=1983) // Thaana
return true;
if($cc>=1984 && $cc<=2047) // NKo
return true;
if($cc>=11568 && $cc<=11647) // Tifinagh
return true;
return false;
}
/**
* clears text from replys, tags, groups, reteets & whitespaces
*
* @param string &$str string to be cleared
*/
private static function getClearText(&$str){
$str = preg_replace('/@[^ ]+|![^ ]+|#[^ ]+/u', '', $str); // reply, tag, group
$str = preg_replace('/^RT[: ]{1}| RT | RT: |^RD[: ]{1}| RD | RD: |[♺♻:]/u', '', $str); // redent, retweet
$str = preg_replace("/[ \r\t\n]+/", ' ', trim($str)); // remove spaces
}
/**
* Takes an UTF-8 string and returns an array of ints representing the
* Unicode characters. Astral planes are supported ie. the ints in the
* output can be > 0xFFFF. O$ccurrances of the BOM are ignored. Surrogates
* are not allowed. ### modified ### returns first character code
*
* Returns false if the input string isn't a valid UTF-8 octet sequence.
*/
private static function utf8ToUnicode($str){
$mState = 0; // cached expected number of octets after the current octet
// until the beginning of the next UTF8 character sequence
$mUcs4 = 0; // cached Unicode character
$mBytes = 1; // cached expected number of octets in the current sequence
$out = array();
$len = strlen($str);
for($i = 0; $i < $len; $i++) {
$in = ord($str{$i});
if (0 == $mState) {
// When mState is zero we expect either a US-ASCII character or a
// multi-octet sequence.
if (0 == (0x80 & ($in))) {
// US-ASCII, pass straight through.
$out[] = $in;
$mBytes = 1;
} elseif (0xC0 == (0xE0 & ($in))) {
// First octet of 2 octet sequence
$mUcs4 = ($in);
$mUcs4 = ($mUcs4 & 0x1F) << 6;
$mState = 1;
$mBytes = 2;
} elseif (0xE0 == (0xF0 & ($in))) {
// First octet of 3 octet sequence
$mUcs4 = ($in);
$mUcs4 = ($mUcs4 & 0x0F) << 12;
$mState = 2;
$mBytes = 3;
} elseif (0xF0 == (0xF8 & ($in))) {
// First octet of 4 octet sequence
$mUcs4 = ($in);
$mUcs4 = ($mUcs4 & 0x07) << 18;
$mState = 3;
$mBytes = 4;
} elseif (0xF8 == (0xFC & ($in))) {
/* First octet of 5 octet sequence.
*
* This is illegal because the encoded codepoint must be either
* (a) not the shortest form or
* (b) outside the Unicode range of 0-0x10FFFF.
* Rather than trying to resynchronize, we will carry on until the end
* of the sequence and let the later error handling code catch it.
*/
$mUcs4 = ($in);
$mUcs4 = ($mUcs4 & 0x03) << 24;
$mState = 4;
$mBytes = 5;
} elseif (0xFC == (0xFE & ($in))) {
// First octet of 6 octet sequence, see comments for 5 octet sequence.
$mUcs4 = ($in);
$mUcs4 = ($mUcs4 & 1) << 30;
$mState = 5;
$mBytes = 6;
} else {
/* Current octet is neither in the US-ASCII range nor a legal first
* octet of a multi-octet sequence.
*/
return false;
}
} else {
// When mState is non-zero, we expect a continuation of the multi-octet
// sequence
if (0x80 == (0xC0 & ($in))) {
// Legal continuation.
$shift = ($mState - 1) * 6;
$tmp = $in;
$tmp = ($tmp & 0x0000003F) << $shift;
$mUcs4 |= $tmp;
if (0 == --$mState) {
/* End of the multi-octet sequence. mUcs4 now contains the final
* Unicode codepoint to be output
*
* Check for illegal sequences and codepoints.
*/
// From Unicode 3.1, non-shortest form is illegal
if (
((2 == $mBytes) && ($mUcs4 < 0x0080)) ||
((3 == $mBytes) && ($mUcs4 < 0x0800)) ||
((4 == $mBytes) && ($mUcs4 < 0x10000)) ||
(4 < $mBytes) ||
// From Unicode 3.2, surrogate characters are illegal
(($mUcs4 & 0xFFFFF800) == 0xD800) ||
// Codepoints outside the Unicode range are illegal
($mUcs4 > 0x10FFFF)
){
return false;
}
if (0xFEFF != $mUcs4) {
$out[] = $mUcs4;
}
//initialize UTF8 cache
$mState = 0;
$mUcs4 = 0;
$mBytes = 1;
}
} else {
/* ((0xC0 & (*in) != 0x80) && (mState != 0))
*
* Incomplete multi-octet sequence.
*/
return false;
}
}
}
return $out;
}
/**
* plugin details
*/
function onPluginVersion(&$versions){
$versions[] = array(
'name' => 'Direction detector',
'version' => DIRECTIONDETECTORPLUGIN_VERSION,
'author' => 'behrooz shabani',
'rawdescription' => _m('shows notices with right-to-left content in correct direction.')
);
return true;
}
}
/*
// Example:
var_dump(DirectionDetectorPlugin::isRTL('RT @everplays ♺: دادگاه به دليل عدم حضور وکلای متهمان بنا بر اصل ١٣٥ قانون اساسی غير قانونی است')); // true
*/
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