+ /**
+ * 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.
+ *
+ * @param string $str
+ * @return mixed array of ints, or false on invalid input
+ */
+ private static function utf8ToUnicode($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 $out;
+ }
+
+ /**
+ * plugin details
+ */
+ function onPluginVersion(array &$versions){
+ $url = 'https://git.gnu.io/gnu/gnu-social/tree/master/plugins/DirectionDetector';
+
+ $versions[] = array(
+ 'name' => 'Direction detector',
+ 'version' => DIRECTIONDETECTORPLUGIN_VERSION,
+ 'author' => 'Behrooz Shabani',
+ 'homepage' => $url,
+ // TRANS: Plugin description.
+ 'rawdescription' => _m('Shows notices with right-to-left content in correct direction.')
+ );
+ return true;
+ }