Data Dumper

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/**
 * Copyright (c)2005-2007 Matt Kruse (javascripttoolbox.com)
 * 
 * Dual licensed under the MIT and GPL licenses. 
 * This basically means you can use this code however you want for
 * free, but don't claim to have written it yourself!
 * Donations always accepted: http://www.JavascriptToolbox.com/donate/
 * 
 * Please do not link to the .js files on javascripttoolbox.com from
 * your site. Copy the files locally to your server instead.
 * 
 */
var Dumper = (function(){
  // "Private"
  var maxIterations = 1000;
  var maxDepth = -1; // Max depth that Dumper will traverse in object
  var iterations = 0;
  var indent = 1;
  var indentText = " ";
  var newline = "\n";
  var object = null; // Keeps track of the root object passed in
  var properties = null; // Holds properties of top-level object to traverse - others are ignored

  function args(a,index) {
    var myargs = new Array();
    for (var i=index; i<a.length; i++) {
      myargs[myargs.length] = a[i];
    }
    return myargs;
  };

  function pad(len) {
    var ret = "";
    for (var i=0; i<len; i++) {
      ret += indentText;
    }
    return ret;
  };

  function string(o) {
    var level = 1;
    var indentLevel = indent;
    var ret = "";
    if (arguments.length>1 && typeof(arguments[1])=="number") {
      level = arguments[1];
      indentLevel = arguments[2];
      if (o == object) {
        return "[original object]";
      }
    }
    else {
      iterations = 0;
      object = o;
      // If a list of properties are passed in
      if (arguments.length>1) {
        var list = arguments;
        var listIndex = 1;
        if (typeof(arguments[1])=="object") {
          list = arguments[1];
          listIndex = 0;
        }
        for (var i=listIndex; i<list.length; i++) {
          if (properties == null) { properties = new Object(); }
          properties[list[i]]=1;
        }
      }
    }
    if (iterations++>maxIterations) { return "[Max Iterations Reached]"; } // Just in case, so the script doesn't hang
    if (maxDepth != -1 && level > (maxDepth+1)) {
      return "...";
    }
    // undefined
    if (typeof(o)=="undefined") {
      return "[undefined]";
    }
    // NULL
    if (o==null) {
      return "[null]";
    }
    // DOM Object
    if (o==window) {
      return "[window]";
    }
    if (o==window.document) {
      return "[document]";
    }
    // FUNCTION
    if (typeof(o)=="function") {
      return "[function]";
    } 
    // BOOLEAN
    if (typeof(o)=="boolean") {
      return (o)?"true":"false";
    } 
    // STRING
    if (typeof(o)=="string") {
      return "'" + o + "'";
    } 
    // NUMBER  
    if (typeof(o)=="number") {
      return o;
    }
    if (typeof(o)=="object") {
      if (typeof(o.length)=="number" ) {
        // ARRAY
        if (maxDepth != -1 && level > maxDepth) {
          return "[ ... ]";
        }
        ret = "[";
        for (var i=0; i<o.length;i++) {
          if (i>0) {
            ret += "," + newline + pad(indentLevel);
          }
          else {
            ret += newline + pad(indentLevel);
          }
          ret += string(o[i],level+1,indentLevel-0+indent);
        }
        if (i > 0) {
          ret += newline + pad(indentLevel-indent);
        }
        ret += "]";
        return ret;
      }
      else {
        // OBJECT
        if (maxDepth != -1 && level > maxDepth) {
          return "{ ... }";
        }
        ret = "{";
        var count = 0;
        for (i in o) {
          if (o==object && properties!=null && properties[i]!=1) {
            // do nothing with this node
          }
          else {
            if (typeof(o[i]) != "unknown") {
              var processAttribute = true;
              // Check if this is a DOM object, and if so, if we have to limit properties to look at
              if (o.ownerDocument|| o.tagName || (o.nodeType && o.nodeName)) {
                processAttribute = false;
                if (i=="tagName" || i=="nodeName" || i=="nodeType" || i=="id" || i=="className") {
                  processAttribute = true;
                }
              }
              if (processAttribute) {
                if (count++>0) {
                  ret += "," + newline + pad(indentLevel);
                }
                else {
                  ret += newline + pad(indentLevel);
                }
                ret += "'" + i + "' => " + string(o[i],level+1,indentLevel-0+i.length+6+indent);
              }
            }
          }
        }
        if (count > 0) {
          ret += newline + pad(indentLevel-indent);
        }
        ret += "}";
        return ret;
      }
    }
  };

  string.popup = function(o) {
    var w = window.open("about:blank");
    w.document.open();
    w.document.writeln("<HTML><BODY><PRE>");
    w.document.writeln(string(o,args(arguments,1)));
    w.document.writeln("</PRE></BODY></HTML>");
    w.document.close();
  };

  string.alert = function(o) {
    alert(string(o,args(arguments,1)));
  };

  string.write = function(o) {
    var argumentsIndex = 1;
    var d = document;
    if (arguments.length>1 && arguments[1]==window.document) {
      d = arguments[1];
      argumentsIndex = 2;
    }
    var temp = indentText;
    indentText = "&nbsp;";
    d.write(string(o,args(arguments,argumentsIndex)));
    indentText = temp;
  };
  
  string.setMaxIterations = function(i) {
    maxIterations = i;
  };
  
  string.setMaxDepth = function(i) {
    maxDepth = i;
  };

  string.$VERSION = 1.0;
  
  return string;
})();