Issue 5249 - Implement :-abp-contains()

chrome/content/elemHideEmulation.js

Index: chrome/content/elemHideEmulation.js
===================================================================
--- a/chrome/content/elemHideEmulation.js
+++ b/chrome/content/elemHideEmulation.js
@@ -88,17 +88,17 @@
     if (selector)
       newSelector += " > ";
     return makeSelector(node.parentElement, newSelector + selector);
   }
 
   return selector;
 }
 
-const abpSelectorRegexp = /:-abp-(properties|has|[A-Za-z\d-]*)\(/i;
+const abpSelectorRegexp = /:-abp-(properties|has|contains|[A-Za-z\d-]*)\(/i;
 
 function parseSelectorContent(content, quoted = false)
 {
   let parens = 1;
   let i = 0;
   let quote = null;
   let originalLength = content.length;
   if (quoted)
@@ -191,16 +191,22 @@
       return null;
     }
 
     let hasSelector = new HasSelector(content.text);
     if (!hasSelector.valid())
       return null;
     selectors.push(hasSelector);
   }
+  else if (match[1] == "contains")
+  {
+    content = parseSelectorContent(selector.substr(startIndex), true);
+
+    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;
   }
@@ -315,16 +321,40 @@
         // we insert a space between the two. It becomes a no-op if selector
         // doesn't have a combinator
         if (subtree.querySelector(newPrefix + " " + selector))
           yield element;
     }
   }
 };
 
+function ContainsSelector(textContent)
+{
+  this._text = textContent;
+}
+
+ContainsSelector.prototype = {
+
+  *getSelectors(prefix, subtree, stylesheet)
+  {
+    for (let element of this.getElements(prefix, subtree, stylesheet))
+      yield [makeSelector(element, ""), subtree];
+  },
+
+  *getElements(prefix, subtree, stylesheet)
+  {
+    let actualPrefix = (!prefix || prefixEndRegexp.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 ", "}");