Ad blocking one website at a time

Alec Jacobson

June 07, 2010

weblog/

-- Safari AdBlocker Applescript
-- Author: Alec Jacobson http://alecjacobson.com
--


-- this might not be necessary... 
-- because safari already has getelementbyclassname... 
-- but perhaps without localization?
-- and perhaps not older safari?
set getElementsByClass to "
/*
  Developed by Robert Nyman, http://www.robertnyman.com
  Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/  
var getElementsByClassName = function (className, tag, elm){
  if (document.getElementsByClassName) {
    getElementsByClassName = function (className, tag, elm) {
      elm = elm || document;
      var elements = elm.getElementsByClassName(className),
        nodeName = (tag)? new RegExp(\"\\b\" + tag + \"\\b\", \"i\") : null,
        returnElements = [],
        current;
      for(var i=0, il=elements.length; i<il; i+=1){
        current = elements[i];
        if(!nodeName || nodeName.test(current.nodeName)) {
          returnElements.push(current);
        }
      }
      return returnElements;
    };
  }
  else if (document.evaluate) {
    getElementsByClassName = function (className, tag, elm) {
      tag = tag || \"*\";
      elm = elm || document;
      var classes = className.split(\" \"),
        classesToCheck = \"\",
        xhtmlNamespace = \"http://www.w3.org/1999/xhtml\",
        namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
        returnElements = [],
        elements,
        node;
      for(var j=0, jl=classes.length; j<jl; j+=1){
        classesToCheck += \"[contains(concat(' ', @class, ' '), ' \" + classes[j] + \" ')]\";
      }
      try  {
        elements = document.evaluate(\".//\" + tag + classesToCheck, elm, namespaceResolver, 0, null);
      }
      catch (e) {
        elements = document.evaluate(\".//\" + tag + classesToCheck, elm, null, 0, null);
      }
      while ((node = elements.iterateNext())) {
        returnElements.push(node);
      }
      return returnElements;
    };
  }
  else {
    getElementsByClassName = function (className, tag, elm) {
      tag = tag || \"*\";
      elm = elm || document;
      var classes = className.split(\" \"),
        classesToCheck = [],
        elements = (tag === \"*\" && elm.all)? elm.all : elm.getElementsByTagName(tag),
        current,
        returnElements = [],
        match;
      for(var k=0, kl=classes.length; k<kl; k+=1){
        classesToCheck.push(new RegExp(\"(^|\\s)\" + classes[k] + \"(\\s|$)\"));
      }
      for(var l=0, ll=elements.length; l<ll; l+=1){
        current = elements[l];
        match = false;
        for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
          match = classesToCheck[m].test(current.className);
          if (!match) {
            break;
          }
        }
        if (match) {
          returnElements.push(current);
        }
      }
      return returnElements;
    };
  }
  return getElementsByClassName(className, tag, elm);
};"
set setElementsToEmpty to "function setElementsToEmpty(a){
  for ( var i=0, len=a.length; i<len; ++i ){
    a[i].innerHTML = '';
  }
};
"

set this_url to ""
repeat
  try
    repeat while appIsRunning("Safari")
      tell application "Safari"
        
        try
          set doc to front document
          set this_url to URL of doc
          do JavaScript getElementsByClass in doc
          do JavaScript setElementsToEmpty in doc
          if this_url starts with "http://www.google.com/search?" then
            -- Regular google search
            -------------------------------------------------------------
            --
            -- ZAP CONTAINING DIV BY ITS ID
            --
            -------------------------------------------------------------
            do JavaScript "document.getElementById('rhsline').innerHTML = ''" in doc
            do JavaScript "document.getElementById('tads').innerHTML = ''" in doc
          else if this_url starts with "http://search.yahoo.com/search" then
            -- Regular yahoo search
            do JavaScript "document.getElementById('east').innerHTML = ''" in doc
            -------------------------------------------------------------
            --
            -- ZAP DIVS OF CERTAIN CLASS WITHIN  CERTAIN CONTAINING DIV (COULD BE NULL)
            --
            -------------------------------------------------------------
            do JavaScript "setElementsToEmpty(getElementsByClassName('ads horiz',null,document.getElementById('main')))" in doc
          -------------------------------------------------------------
          --
          -- ADD OTHER SITES HERE
          --
          -------------------------------------------------------------
          end if
          -- set delay amount accordingly to manage how much CPU to devote to blocking ads
          -- recommended between 1.0 and 0.001 seconds
          delay 0.1
        on error errText number errNum
          -- if anything but doc changing before ads removed or safari open but no windows
          -- pause so that CPU isn't stolen
          delay 2
        end try
      end tell
    end repeat
  on error errText number errNum
    if errNum is equal to -128 or errNum is equal to -609 then
      -- safari no longer open
    else
      display dialog errText & " " & errNum
    end if
    
  end try
  delay 5
end repeat

-- from http://codesnippets.joyent.com/posts/show/1124
on appIsRunning(appName)
  tell application "System Events" to (name of processes) contains appName
end appIsRunning