code reviewed implementation of high-medium generic cosmetic filters

src/js/background.js

@@ -93,7 +93,7 @@ return {
 
     // read-only
     systemSettings: {
-        compiledMagic: 'rzohdugizuxh',
+        compiledMagic: 'wzwgqiwgjhsh',
         selfieMagic: 'mnigwksyvgkv'
     },
 

src/js/contentscript-end.js

@@ -577,19 +577,39 @@ var uBlockCollapser = (function() {
         var nodeList = selectNodes('a[href^="http"]');
         var iNode = nodeList.length;
         var node, href, pos, hash, selectors, selector, iSelector;
+
         while ( iNode-- ) {
             node = nodeList[iNode];
             href = node.getAttribute('href');
             if ( !href ) { continue; }
+
             pos = href.indexOf('://');
             if ( pos === -1 ) { continue; }
+
             hash = href.slice(pos + 3, pos + 11);
             selectors = generics[hash];
             if ( selectors === undefined ) { continue; }
+
+            // A string.
+            if ( typeof selectors === 'string' ) {
+                if (
+                    href.lastIndexOf(selectors.slice(8, -2), 0) === 0 &&
+                    injectedSelectors.hasOwnProperty(selectors) === false
+                ) {
+                    injectedSelectors[selectors] = true;
+                    out.push(selectors);
+                }
+                continue;
+            }
+
+            // An array of strings.
             iSelector = selectors.length;
             while ( iSelector-- ) {
                 selector = selectors[iSelector];
-                if ( injectedSelectors.hasOwnProperty(selector) === false ) {
+                if (
+                    href.lastIndexOf(selector.slice(8, -2), 0) === 0 &&
+                    injectedSelectors.hasOwnProperty(selector) === false
+                ) {
                     injectedSelectors[selector] = true;
                     out.push(selector);
                 }

src/js/cosmetic-filtering.js

@@ -769,7 +769,7 @@ FilterContainer.prototype.fromCompiledContent = function(text, lineBeg, skip) {
 
     var lineEnd;
     var textEnd = text.length;
-    var line, fields, filter, bucket;
+    var line, fields, filter, key, bucket;
 
     while ( lineBeg < textEnd ) {
         if ( text.charAt(lineBeg) !== 'c' ) {
@@ -841,10 +841,14 @@ FilterContainer.prototype.fromCompiledContent = function(text, lineBeg, skip) {
         }
 
         if ( fields[0] === 'hmg0' ) {
-            if ( Array.isArray(this.highMediumGenericHide[fields[1]]) ) {
+            key = fields[1];
-                this.highMediumGenericHide[fields[1]].push(fields[2]);
+            bucket = this.highMediumGenericHide[key];
+            if ( bucket === undefined ) {
+                this.highMediumGenericHide[key] = fields[2];
+            } else if ( Array.isArray(bucket) ) {
+                bucket.push(fields[2]);
             } else {
-                this.highMediumGenericHide[fields[1]] = [fields[2]];
+                this.highMediumGenericHide[key] = [bucket, fields[2]];
             }
             this.highMediumGenericHideCount += 1;
             continue;