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