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Commit db497e80 authored by Brion Vibber's avatar Brion Vibber

Initial version of everplay's RTL direction detector plugin, sets initial...

Initial version of everplay's RTL direction detector plugin, sets initial direction correctly for primarily RTL notices within an LTR site layout.
parent 4a028d5e
<?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(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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