markout: improve `` escaping

js/twister_formatpost.js

@@ -496,30 +496,6 @@ function htmlFormatMsg(msg, opt) {
         }
 
         // changing the string
-        if (chr === '`' && markoutOpt === 'apply') {  // if markoutOpt === 'clear' then ` does not escape anythyng so it needs to be handled like other tags
-            for (i = 0; i < p.length; i++) {
-                if (p[i].a > -1) {
-                    if (p[i].t === -1 || (p[i].t === 0 && p[i].a > i)) {
-                        if (p[i].k > 1)
-                            t = Array(p[i].k).join(chr);
-                        else
-                            t = '';
-                        j = p[i].a;
-                        t = t + msg.str.slice(p[i].i + p[i].k, p[j].i);
-                        if (p[j].k > 1)
-                            t = t + Array(p[i].k).join(chr);
-                        t = '<' + tag + '>' + t + '</' + tag + '>';
-                        msg.htmlEntities.push(t.replace(/&(?!lt;|gt;)/g, '&amp;'));
-                        htmlEntityEncoded = '>' + (msg.htmlEntities.length - 1).toString() + '<';
-                        msg.str = msg.str.slice(0, p[i].i) + htmlEntityEncoded + msg.str.slice(p[j].i + p[j].k);
-                        l = htmlEntityEncoded.length - p[j].i - p[j].k + p[i].i;
-                        i = j;
-                        for (j += 1; j < p.length; j++)
-                            p[j].i += l;
-                    }
-                }
-            }
-        } else {
         if (markoutOpt === 'apply') {
             t = '</' + tag + '>';
             tag = '<' + tag + '>';
@@ -547,7 +523,6 @@ function htmlFormatMsg(msg, opt) {
                     p[j].i += l;
             }
         }
-        }
 
         return msg;
     }
@@ -610,7 +585,17 @@ function htmlFormatMsg(msg, opt) {
 
     msg = {str: escapeHtmlEntities(msg), htmlEntities: []};
 
-    msg = markout(msg, markoutOpt, '`', 'samp');  // <samp> tag is kind of monospace, here sequence of chars inside it will be escaped from markup
+    // markout is not applied for chars inside of ``; to escape ` use backslash
+    if (markoutOpt === 'apply')
+        msg.str = msg.str.replace(/`(?:[^`\\]|\\.)*`/g, function (s) {
+            msg.htmlEntities.push('<samp>' + s.slice(1, -1).replace(/\\`/g, '`')
+                .replace(/&(?!lt;|gt;)/g, '&amp;') + '</samp>');
+            return '>' + (msg.htmlEntities.length - 1).toString() + '<';
+        });
+    else if (markoutOpt === 'clear')
+        msg.str = msg.str.replace(/`((?:[^`\\]|\\.)*)`/g, function (s) {
+            return s.slice(1, -1).replace(/\\`/g, '`');
+        });
 
     // handling links
     for (i = 0; i < msg.str.length - 7; i++) {