Issue 5249 - Implement :-abp-contains()

chrome/content/elemHideEmulation.js

Index: chrome/content/elemHideEmulation.js
===================================================================
--- a/chrome/content/elemHideEmulation.js
+++ b/chrome/content/elemHideEmulation.js
@@ -225,16 +225,41 @@
         // 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.includes(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 ", "}");
@@ -318,32 +343,42 @@
       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;
     }
 
     let suffix = this.parseSelector(selector.substr(content.end + 1));
     if (suffix == null)
       return null;
 
     selectors.push(...suffix);
 
+    if (selectors.length == 1 && selectors[0] instanceof ContainsSelector)
+    {
+      this.window.console.error(
+        new SyntaxError("Failed to parse Adblock Plus " +
+                        `selector ${selector}, can't ` +
+                        "have a lonely :-abp-contains()."));
+      return null;
+    }
     return selectors;
   },
 
   addSelectors(stylesheets)
   {
     let selectors = [];
     let selectorFilters = [];