Issue 5249 - Implement :-abp-contains()

chrome/content/elemHideEmulation.js

Index: chrome/content/elemHideEmulation.js
===================================================================
--- a/chrome/content/elemHideEmulation.js
+++ b/chrome/content/elemHideEmulation.js
@@ -160,16 +160,18 @@
     selectors.push(new PropsSelector(content.text));
   else if (match[1] == "has")
   {
     let hasSelector = new HasSelector(content.text);
     if (!hasSelector.valid())
       return null;
     selectors.push(hasSelector);
   }
+  else if (match[1] == "contains")
+    selectors.push(new ContainsSelector(content.text));
   else
   {
     // this is an error, can't parse selector.
     console.error(new SyntaxError("Failed parsing AdBlock Plus " +
                                   `selector ${selector}, invalid ` +
                                   `pseudo-class -abp-${match[1]}().`));
     return null;
   }
@@ -284,16 +286,41 @@
         // we insert a space between the two. It becomes a no-op if selector
         // doesn't have a combinator
         if (subtree.querySelector(selector))
           yield element;
     }
   }
 };
 
+function ContainsSelector(textContent)
+{
+  this._text = textContent;
+}
+
+ContainsSelector.prototype = {
+  requiresHiding: true,
+
+  *getSelectors(prefix, subtree, stylesheet)
+  {
+    for (let element of this.getElements(prefix, subtree, stylesheet))
+      yield [makeSelector(element, ""), subtree];
+  },
+
+  *getElements(prefix, subtree, stylesheet)
+  {
+    let actualPrefix = (!prefix || incompletePrefixRegexp.test(prefix)) ?
+        prefix + "*" : prefix;
+    let elements = subtree.querySelectorAll(actualPrefix);
+    for (let element of elements)
+      if (element.textContent == this._text)
+        yield element;
+  }
+};
+
 function PropsSelector(propertyExpression)
 {
   let regexpString;
   if (propertyExpression.length >= 2 && propertyExpression[0] == "/" &&
       propertyExpression[propertyExpression.length - 1] == "/")
   {
     regexpString = propertyExpression.slice(1, -1)
       .replace("\\x7B ", "{").replace("\\x7D ", "}");