// ==UserScript==
// @name          tagcount
// @namespace     http://www.wayner.org/
// @include       http://*.com/*
// @include       http://*.boingboing.net/*
// @include       http://*.*.com/*
// @include       file:*.html
// @description   Count certain words. 
// @exclude

// ==/UserScript==

   

 

//
// Recursively walk down the Document Object Model
// tree and stop at the nodes with text that you can
// see. This saves some time and also avoids inadvertantly
// changing any text or embedded scripts. 
//
window.textCountRecurse=function(node, keep, matchString) {
 var ans=0;
 var thisLevel=0;
 if (node.nodeType == 3) {// text node
   thisLevel+=countWords(node);
 } else {
   var child = node.firstChild;
   while (child != null) {
    if (node.nodeName.toLowerCase()==matchString){
    
       ans+=textCountRecurse(child,true, matchString);
    } else {
       ans+=textCountRecurse(child, keep, matchString);
    }
    child = child.nextSibling;
   } 
 }
 if (!keep) {
   return ans;
 }
 return ans+thisLevel;
}
 
 
// From: http://www.somacon.com/p355.php

function trim(stringToTrim) {
	return stringToTrim.replace(/^\s+|\s+$/g,"");
}

//
// This function breaks apart a string of text into
// individual words and then counts them.
// This is not the most accurate way to do this, but it will be good
// enough for statistics... That is, it should be uniformly inaccurate.
//
window.countWords=function(node){ 
   s=node.nodeValue.split(" ");
   var ans=0;
   for (var i=0;i<s.length;i++){
      if (trim(s[i]).length>0){
         ans++;
      }
    }
   return ans;
}

 
 




window.popup=function(){
   return prompt("Give me a tag to count the words contained within."); 
}


// Space Checking menu command
    window.editList=function() {
        popup();
    }
    GM_registerMenuCommand("Add a new replacement mapping with this form: replaceMe=withMe",
                           editList);


 


//
// This code links the recursive tree replacement
// function with the page loader. Every page that
// fits the patterns defined in the header will 
// be given the text replacement treatment.
//
window.addEventListener("load", function() {  
   matchString=popup().toLowerCase();
   var count=textCountRecurse(document.body,false,matchString); 
   alert("Word count="+count);
}, false);