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<?php // -*-php-*-
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/*
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* Original module by Alaa Abd El Fatah.
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* Mohammed Sameer: My Modifications Copyright (c) 2004 Mohammed Sameer,
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* under the GNU GPL v2 or later.
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* Mohammed Sameer: 2004 10 30
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* * Ported to drupal 4.5 API.
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*/
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setlocale(LC_ALL, "ar_EG.UTF-8");
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function bidi_help($section) {
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$output = "";
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switch ($section) {
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case 'admin/modules#description':
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$output = t("Automaticaly sets line direction");
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break;
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}
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return $output;
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}
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function bidi_filter($op, $delta = 0, $format = -1, $text = "") {
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switch ($op) {
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case 'list':
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return array(0 => t('BiDi'));
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// case "name":
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// return t("Bidi filter");
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case 'description':
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return t("Bidi filter");
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case "process":
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return _bidi_filter_process($text);
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case "settings":
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return _bidi_filter_settings($text);
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default:
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return $text;
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}
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}
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//get dir needs to be split into a single include file so it can be used on theme and other places
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function _get_dir($text) {
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$text = strtolower($text);
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$len = strlen($text);
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$arabic = 0;
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$english = 0;
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//constants
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$a = ord('a');
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$z = ord('z');
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//arabic UTF-8 letters have one of these values in the 1st byte
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$ar1 = 0xd8;
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$ar2 = 0xd9;
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// this calculates the dominant language in the text, most bidi implementations just use the first letter (which may be more efficient)
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for ($i = 0; $i < $len; ++$i) {
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$bin = ord($text[$i]);
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if ($bin == $ar1 || $bin == $ar2) {
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++$arabic;
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++$i;
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} else if ($bin >= $a && $bin <= $z) {
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++$english;
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}
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}
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//should this return a bool instead?
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if ($english || $arabic) {
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if ($english > $arabic)
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return ' class="left2right"';
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else
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return ' class="right2left"';
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} else {
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return "";
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}
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}
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function _bidi_filter_process($text) {
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$output = "";
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$len = strlen($text);
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$i = 0;
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while ($i < $len) {
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//find next tag
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$e = strpos(substr($text, $i), "<");
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if ($e === FALSE) break;
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$output.=substr($text, $i, $e);
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$i += $e;
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//find end of next tag
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$e = strcspn(substr($text, $i), "/> ");
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$tag = substr($text, $i+1, $e-1);
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$output.=substr($text, $i, $e);
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$i += $e;
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switch ($tag) {
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//single tag entity
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case "img":
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case "br":
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case "hr":
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continue;
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break;
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//nested cases
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case "ul":
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case "ol":
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case "dl":
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case "div":
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$e = 0;
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$j = 1; //stack counter
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// if $j = 0 then stack is empty
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while ($j > 0) {
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$e += strpos(substr($text, $i+$e) , $tag);
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//yeah I know I'm assuming certain sizes for tags, sue me
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if ($text[$i+$e-1] == '<') { //new nested block
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++$j;
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} else if ($text[$i+$e-1] == '/') { //end of block
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--$j;
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}
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$e += 2; //skip current tag
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}
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$content = substr($text, $i+1, $e);
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$output.=_get_dir(strip_tags($content));
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$e += strlen($tag);
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$output.= substr($text, $i, $e);
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$i += $e;
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break;
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//block elements these get out attention
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case "p":
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case "blockquote":
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case "pre":
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case "h1":
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case "h2":
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case "h3":
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case "h4":
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case "h5":
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case "h6":
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//nested lists are proken better think of a fix
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case "li":
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$close_tag = "</".$tag.">";
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//breaks on extra whitespaces, maybe I should use regexps instead
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$e = strpos(substr($text, $i), $close_tag);
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$content = substr($text, $i+1, $e-1);
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//calculate directions
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$output.= _get_dir(strip_tags($content));
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$e += strlen($close_tag);
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$output.= substr($text, $i, $e);
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$i += $e;
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break;
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//non block tags we are not handeling
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default:
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$close_tag = "</".$tag.">";
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$e = strpos(substr($text, $i), $close_tag) + strlen($close_tag);
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$output.= substr($text, $i, $e);
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$i += $e;
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}
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}
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//any missing content
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$output .= substr($text, $i);
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return $output;
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}
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function _bidi_filter_settings() {
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return form_group(t("Bidi filter"), t("automatic bidi"));
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}
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function bidi_filter_tips() {
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if ($long)
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{
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}
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else {
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return t("You may write mixed Arabic and English freely, line direction will be computed automaticaly");
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}
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}
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?>
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