Issue 5249 - Implement :-abp-contains()

chrome/content/elemHideEmulation.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 212 matching lines @@
                           element, styles);
       for (let selector of iter)
         // 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 ", "}");
   }
   else
@@ skipping 73 matching lines @@
     }
     if (match[1] == "properties")
       selectors.push(new PropsSelector(content.text));
     else if (match[1] == "has")
     {
       let hasSelectors = this.parseSelector(content.text);
       if (hasSelectors == null)
         return null;
       selectors.push(new HasSelector(hasSelectors));
     }
+    else if (match[1] == "contains")
+      selectors.push(new ContainsSelector(content.text));
     else
     {
       // this is an error, can't parse selector.
       this.window.console.error(
         new SyntaxError("Failed to parse Adblock Plus " +
                         `selector ${selector}, invalid ` +
                         `pseudo-class :-abp-${match[1]}().`));
       return null;
     }
 
@@ skipping 84 matching lines @@
 
       if (this.patterns.length > 0)
       {
         let {document} = this.window;
         this.addSelectors(document.styleSheets);
         document.addEventListener("load", this.onLoad.bind(this), true);
       }
     });
   }
 };