
/*

  SmartClient Ajax RIA system
  Version v9.0p_2021-05-01/LGPL Deployment (2021-05-01)

  Copyright 2000 and beyond Isomorphic Software, Inc. All rights reserved.
  "SmartClient" is a trademark of Isomorphic Software, Inc.

  LICENSE NOTICE
     INSTALLATION OR USE OF THIS SOFTWARE INDICATES YOUR ACCEPTANCE OF
     ISOMORPHIC SOFTWARE LICENSE TERMS. If you have received this file
     without an accompanying Isomorphic Software license file, please
     contact licensing@isomorphic.com for details. Unauthorized copying and
     use of this software is a violation of international copyright law.

  DEVELOPMENT ONLY - DO NOT DEPLOY
     This software is provided for evaluation, training, and development
     purposes only. It may include supplementary components that are not
     licensed for deployment. The separate DEPLOY package for this release
     contains SmartClient components that are licensed for deployment.

  PROPRIETARY & PROTECTED MATERIAL
     This software contains proprietary materials that are protected by
     contract and intellectual property law. You are expressly prohibited
     from attempting to reverse engineer this software or modify this
     software for human readability.

  CONTACT ISOMORPHIC
     For more information regarding license rights and restrictions, or to
     report possible license violations, please contact Isomorphic Software
     by email (licensing@isomorphic.com) or web (www.isomorphic.com).

*/
isc._debug = {};

isc.addProperties(isc._debug, { 

	// Stack Traces
	// --------------------------------------------------------------------------------------------
    // given the 'arguments' object from a function invocation, return a developer-readable summary,
    // complete with the names and values of the arguments
    
	//>	@method	Class.getCallTrace()
    // Returns a one-line summary of the current method call, showing method name and passed
    // arguments. 
    // This function is available as a static on every ISC Class and as an instance
    // method on every instance of an ISC Class.<br>
    // General best practice is to call the method as "this.getCallTrace()" whenever "this" is an
    // instance, or call the static classMethod on the +link{class:Log} class otherwise. 
    //
    // @param [args]  (Arguments)  arguments object from the call to trace.  On IE, defaults to the
    //                             calling function's arguments
    //
	// @group debug
    // @visibility external
    //<
    //> @classMethod Class.getCallTrace()
    // @include method:class.getCallTrace
    // @visibility external
    //<
    // We also explicitly doc this method on the Log class (the only place it was doc'd prior to 7.0)
    //> @classMethod Log.getCallTrace()
    // @include method:class.getCallTrace
    // @visibility external
    //<
    getCallTrace : function (args, thisValue, showShortMethodBody, argNames, argValues, extensionTrace) {
        if (args == null) args = arguments.caller;
        if (args == null) return "[getCallTrace(): Error: couldn't get arguments object]";
        
        var output, func = args.callee;
        
        // determine function name from arguments.callee.  arguments.callee property is the Function
        // instance being invoked.
        if (func == null) { 
            // browser doesn't support args.callee? (should never happen)
            output = "[args.callee == null]";
        } else if (!isc.Func) { 
            output = "[Func utility class not loaded]";
        } else {
            output = isc.Func.getName(func, true);
        }
        
        // output a summary of the parameters 
        output += "(";
        
        // get the names of the parameters if available
        argNames = argNames || (func != null ? isc.Func.getArgs(func) : []);
        argValues = argValues || args;
        
        // iterate to the larger of the declared parameters or the passed parameters
        var length = Math.max(argValues.length, argNames.length);

        for (var i = 0; i < length; i++) {
            var argName = argNames[i],
                argValue = argValues[i];

            if (i > 0) output += ", ";
            if (argName != null) {
                // show the names of the parameters as eg
                // ListGrid.setRecordStyle(recordNum=>2, newStyle=>"cellDark");
                // Note that there may be no name for the parameter if a parameter was passed
                // where none was expected.
                output += argName + "=>";
            }
            output += this.echoLeaf(argValue);
        }
        output += ")";

        // there's no known way to generally derive the value of "this" from the arguments object -
        // but in ISC several key methods store it explicitly.  This is tremendously valuable in
        // trying to interpret long stacks with method calls weaving through several related
        // instances.a
        thisValue = thisValue || args.__this;
        if (thisValue) output += " on " + this.echoLeaf(thisValue);

        var showedCrashCode = false;
        

        // determine whether to show entire body of method in the trace
        if (showedCrashCode || (!showShortMethodBody && !func._showBodyInTrace)) return output;
    
        var body = this._getTrimmedMethodBody(func);
        if (!func._showBodyInTrace) {
            // if the function at the top of the stack (the one that crashed) or at the
            // bottom of the stack (the entry point) is a one-liner, show it's contents.
            // This is very useful when an anoynmous expression is being called on a timer.
            // NOTE: have to be careful here to avoid spitting out giant methods:
            // - with stripping all functions in ISC are one-liners, hence the crude length
            //   limit
            // - when using XML, very long functions are delivered as stringMethods
            // Could limit to anonymous functions like so:
            //     && args.callee.getName && args.callee.getName() == "anonymous") 
            var lines = body.split(/[\r\n]+/);
            if (lines.length > 1 || lines[0].length > 200) return output;
        }
        output += '\n        "' + body + '"';
    
        return output;
    },

    // for when stack walking is enabled, trim off the try..catch block added to all functions
    _getTrimmedMethodBody : function (func) {
        var body = isc.Func.getBody(func);  
        
        return body.trim();
    },

	//>	@method    Class.getStackTrace()
    // Returns a "stack trace" - one line per method in the current call stack, showing the method
    // name and any parameters passed.
    // This function is available as a static on every ISC Class and as an instance
    // method on every instance of an ISC Class.<br>
    // General best practice is to call the method as "this.getStackTrace" whenever "this" is an
    // instance, or call the static classMethod on the +link{class:Log} class otherwise. 
    // <P>
    // Platform Notes: In Mozilla Firefox, if Firebug is enabled, a stack trace will be logged
    // to the firebug console in addition to the standard stack trace string returned by
    // this method.
    // <br>
    // In browsers other than Internet Explorer a complete stack trace may not be available - 
    // this occurs when a function is re-entrant (meaning it calls itself). In this case the
    // stack will terminate with text indicating where the recursive function call occurred.
    // <P>
    // See +link{group:debugging} for further information information.
    //
    // @return (String) stack trace.  Use eg +link{method:isc.Class.logWarn()} to log to the
    // Developer Console.
	// @group debug
    // @visibility external
    //<
    //> @classMethod Class.getStackTrace()
    // @include method:class.getStackTrace
    // @visibility external
    //<
    
    // We also explicitly doc this method on the Log class (the only place it was doc'd prior to 7.0)
    //> @classMethod Log.getStackTrace()
    // @include method:class.getStackTrace
    // @visibility external
    //<
    getStackTrace : function (args, ignoreLevels, maxLevels, skipFBugTrace, extensionTrace) {
        
        
        var stack = "";
        

        stack += this._getStackTraceFromArgs(args,ignoreLevels,maxLevels);
        
        // If Firebug is present we can show a stack trace in it directly - see fireBugTrace()
        if (this.hasFireBug() && !skipFBugTrace) {
            isc.Log._fBugTrace = isc.Log._fBugTrace || 0;
            var traceId = "FBugTrace" + isc.Log._fBugTrace++;
            stack += "\r\n" + this.fireBugTrace(traceId);
        }
        
        return stack;
    },
    
    
    _getStackTraceFromArgs : function (args, ignoreLevels, maxLevels, extensionTrace) {
        // If we can't get at the properties necessary to do a stack walk just log a warning and 
        // quit
        if (!arguments || !arguments.callee || !arguments.callee.caller) {
            return " [Stack trace not supported in this browser]";
        }
        
        // if we are not passed a specific arguments objects, default to the arguments object of
        // the function that asked for the stack trace
        
        if (args == null) args = arguments.caller || arguments.callee.caller.arguments;
        var output = []; 
        
        // in earlier versions of IE we can use arguments.caller to walk up the stack
        // This actually allows us to get past recursive function calls in a way that
        // arguments.callee.caller does not - use it if available
        
        
        var useArgsCaller = extensionTrace || (isc.Browser.isIE && isc.Browser.version <= 5);

        // skip some of the stack (useful to eg, a logging subsystem) 
        if (ignoreLevels != null) {
            for (var i = 0; i < ignoreLevels; i++) {
                if (args == null) break;
                if (!useArgsCaller) {
                    args = args.callee.caller.arguments;
                } else {
                    args = args.caller;
                }
            }
        }


        // we ran out of stack trying to skip past the ignoreLevels
        if (args == null) {
            return "";
        }

        var func = args.callee;

        var seenFuncs = [];

        var top = true;
        if (maxLevels == null) maxLevels = Number.MAX_VALUE;
        var numLevels = 0;
        
        var message = "";

        while (func != null && args != null && numLevels < maxLevels) {

            if (args.timerTrace) {
                output.add("\nStack trace for setTimeout() call:   " + args.timerTrace);
                break;
            }

            if (!useArgsCaller) {
                if (seenFuncs.contains(func)) {
                    output.add("    ** recursed on " + isc.Func.getName(func, true));
                    break;
                }
                seenFuncs.add(func);
            }

            var showFuncText = (top || (args.callee != null && args.callee.caller == null));
            if (extensionTrace) {
                
            } else {
                output.add("    " + this.getCallTrace(args, null, showFuncText));
            }

            if (numLevels == 0 || isc.showLocalsInTraces) {
                var locals = args.__frame;
                
                var frameLocalsOutput = this._getFrameLocals(locals, numLevels != 0);
                if (frameLocalsOutput) output.add(frameLocalsOutput);            
            }
            
            func = args.callee;
            if (!useArgsCaller) {
                func = func.caller;
                if (func) args = func.arguments;
            } else args = args.caller; 
            top = false;
            numLevels++;

            // the extension currently provides the global scope as a stack frame for
            // completeness
            if (extensionTrace && args != null && args.callee == null) {
                output.add("    [global scope]");
                break;
            }
        }
        if (output.length == 0) return "";
        // skip a line at the beginning of the stack trace
        return "\r\n" + output.join("\r") + "\r";
    },

    // http://stackoverflow.com/questions/398111/javascript-that-detects-firebug
    // Note that console.exception was added to Firefox 28, so we need to check whether console.exception
    // is a native function or not.
    // https://developer.mozilla.org/en-US/docs/Web/API/console.error
    hasFireBug : function () {
        return (isc.Browser.isMoz &&
                window.console != null &&
                (window.console.firebug != null ||
                 (window.console.exception != null &&
                  (isc.Browser.version <= 27 || window.console.exception.toString().indexOf("[native code]") < 0))));
    },

    fireBugVersion : function () {
        return this.hasFireBug() ? window.console.firebug : null;
    },

    // this help function
    fireBugTrace : function (traceId) {
        window.console.trace(traceId);
        return " [Complete stack trace logged via Firebug: " + traceId + "]";
    },

    // get a report of local variable values from a frame (that is, a dump of local variable
    // values from the moment a function crashed)
    _getFrameLocals : function (frame, singleLine) {
        var output = isc.SB.create();
        var first = true;
        for (var varName in frame) {
            var varValue = frame[varName], undef;

            // avoid reporting variables that have not yet been declared or assinged to.  Note
            // this also catches values that have been explicitly assigned undef; we require
            // the developer to understand what the omission means.
            if (varValue === undef) continue;

            // ignore special values stored on the frame object (we assume no local variable
            // would be named with an _)
            if (isc.startsWith(varName, isc._underscore)) continue;

            if (singleLine) {
                if (!first) output.append(", ");
                else output.append("\n        locals: ");
                output.append(varName + "=>" + this.echoLeaf(varValue));
                first = false;
            } else {
                output.append("\n        " + varName + " = " + this.echoLeaf(varValue));
            }
        }
        return output.toString();
    },
    
    // called in two circumstances (split these uses?)
    // - when trapping JS errors at top level entry points (eg events) in non-IE browsers
    // - with "stackwalking" try..catch blocks added to all methods, called from every catch
    //   block successively in order to walk the stack by catch..rethrow (any browser)
    _reportJSError : function (error, args, thisValue, frame, addedMessage) {
        

        // avoid reporting the same error twice
        if (error._reported) return;
        error._reported = true;
    
        var message = (addedMessage ? addedMessage + ": " : "") + error.toString();
        
        // Do an in-browser transform of the native stack to make it more readable.
        if (error.stack) {
            message += "\nStack from error.stack:\n";
            message += isc.StackTrace.fromNativeStack(error.stack).toString();
        } else {
            message += "  [No error.stack available]";
        }

        

        this._reportJSErrorStack(message);
    },

    
    _reportJSErrorStack : function (message) {
        this.logWarn(message);
    },

    

    

    // Shim for old function ... now implemented in debug/StackTrace.js
    transformMozStackTrace : function (trace) {
        return isc.StackTrace.fromNativeStack(trace).toString();
    },
    
    

    // Echoing Objects
    // --------------------------------------------------------------------------------------------
	
	//>	@method	Class.echoLeaf()
    // Return a very short (generally less than 40 characters) string representation of any object,
    // suitable for viewing by a developer for debugging purposes.
    // This function is available as a static on every ISC Class and as an instance
    // method on every instance of an ISC Class.<br>
    // General best practice is to call the method as "this.echoLeaf" whenever "this" is an
    // instance, or call the static classMethod on the +link{class:Log} class otherwise. 
    //
    // @param  obj  (any)  object to echo
    // @return (string) a short string representation of the object
    //
	// @group debug
    // @see class.echo()
    // @visibility external
    //<
    //> @classMethod Class.echoLeaf()
    // @include method:class.echoLeaf
    // @visibility external
    //<
    
    // We also explicitly doc this method on the Log class (the only place it was doc'd prior to 7.0)
    //> @classMethod Log.echoLeaf()
    // @include method:class.echoLeaf
    // @visibility external
    //<
    _echoLeafLimit: 40,                     
	echoLeaf : function (obj, longMode) {
    	var output = "", undefined;
		if (obj === undefined) return "undef";
        try {
            // Avoid attempting to manipulate SGWT Java objects
            if (obj != null && isc.Browser.isSGWT && window.SmartGWT.isNativeJavaObject(obj)) 
                return obj.toString();

    		if (isc.isA.Class(obj)) {
    			// Always call toString() for instances of Classes.  We need handle this case
    			// specially, since typeof [instance of a Class] is "object", and we try to do
    			// special things for vanilla Objects below
    			output += obj.toString();
            } else if (isc.isAn.Array(obj)) {
    			output += "Array[" + obj.length + "]";
            } else if (isc.isA.Date(obj)) {
    			output += "Date(" + obj.toShortDate() + ")";
            } else if (isc.isA.Function(obj)) {            
                output += isc.Func.getName(obj, true) + "()";
    		} else {
    			switch (typeof obj) {
    			case "string" : 
                    var limit = this._echoLeafLimit;
                    // for shorter strings show the whole thing.  Also, in "longMode" don't
                    // shorten.
                    if (obj.length <= limit || longMode) {
                        output += '"' + obj + '"'; 
                        break;
                    }
    
                    // for long strings, show an elipsis and the strings full length
                    output += '"' + obj.substring(0, limit) + '..."[' + obj.length + ']';

                    // convert CR/LF to avoid spanning several lines
                    output = output.replaceAll("\n", "\\n").replaceAll("\r", "\\r");
                    break;
    			case "object" :
    				// typeof null is "object"
    				if (obj == null) { output += "null"; break; }
    
                    // DOM object
                    if (obj.tagName != null) {
                        output += "[" + obj.tagName + "Element]" + this.getIDText(obj);
                        break;
                    }
    
    			    var toString = "" + obj;
    			    if (toString != "" && toString != "[object Object]" && 
                        toString != "[object]") 
                    {
                        // someone went through the trouble of making a better toString(), so
                        // use it.  NOTE: check for "" because in IE an XmlNodeList among
                        // others will toString() to ""
                        output += toString;
                        break;
                    }
    
    			    // return generic "Obj", plus any obvious ID/name property
                    output += "Obj" + this.getIDText(obj); 
                
    				break;
    			default: output += "" + obj; // invoke native toString()
    			}
    		}
    		return output;
        } catch (e) {
            var message = "[Error in echoLeaf: " + e + "]";
            output += message;
            this.logDebug(message, "Log");
            return output;
        }            
	},

    getIDText : function (obj) {
        // look for properties that may name the object

        // name
        var name = obj.name || (isc.isAn.XMLNode(obj) ? obj.getAttribute("name") : null);
        if (name != null && !isc.isAn.emptyString(name)) return "{name:" + name + "}";

        // ID or id
        var ID = obj.ID != null ? obj.ID :
                    obj.id != null ? obj.id : 
                      (isc.isAn.XMLNode(obj) ? obj.getAttribute("id") : null);
        if (ID != null && !isc.isAn.emptyString(ID)) return "{ID:" + ID + "}";

        // nodeName (HTML DOM)
        if (obj.nodeName != null && !isc.isAn.emptyString(obj.nodeName)) {
            return "{nodeName:" + obj.nodeName + "}";
        }
        
        // title (eg sections)
        var title = obj.title || (isc.isAn.XMLNode(obj) ? obj.getAttribute("title") : null);
        if (title != null && !isc.isAn.emptyString(title)) return "{title:" + title + "}";

        // type (eg validators)
        var type = obj.type || (isc.isAn.XMLNode(obj) ? obj.getAttribute("type") : null);
        if (type != null && !isc.isAn.emptyString(type)) return "{type:" + type + "}";

        // _constructor (initData)
        var type = obj._constructor;
        if (type != null && !isc.isAn.emptyString(type)) return "{_constructor:" + type + "}";

        // random other objects that might have a "label" property (such as a TreeNode where
        // "label" is the titleField)
        var label = obj.label || (isc.isAn.XMLNode(obj) ? obj.getAttribute("label") : null);
        if (label != null && !isc.isAn.emptyString(label)) return "{label:" + label + "}";
        
        // className (initData as captured by globalEvalWithCapture)
        var type = obj.className;
        if (type != null && !isc.isAn.emptyString(type)) return "{className:" + type + "}";

        // length: handy for recognizing XMLNodeLists and similar objects in IE, which aren't
        // Arrays and can't be enumerated 
        if (obj.length != null) return "{length:" + obj.length + "}";
        return "";
    },

	//>	@method	Class.echo()
    // Return a short string representation of any object, suitable for viewing by a developer for
    // debugging purposes.
    // <P>
    // If passed an object containing other objects, echo will not recurse into subobjects,
    // summarizing them instead via echoLeaf().
    // <P>
    // NOTE: echo() is used to generate the output shown in the Log window when evaluating an
    // expression.
    // <P>
    // This function is available as a static on every ISC Class and as an instance
    // method on every instance of an ISC Class.<br>
    // General best practice is to call the method as "this.echo()" whenever "this" is an
    // instance, or call the static classMethod on the +link{class:Log} class otherwise. 
    // 
    // @param obj (any) object to echo
    // @return (string) a short string representation of the object
    // 
	// @group debug
    // @see Log.echoAll()
    // @see Log.echoLeaf()
    // @visibility external
    //<
    
    //> @classMethod Class.echo()
    // @include method:class.echo
    // @visibility external
    //<
    
    // We also explicitly doc this method on the Log class (the only place it was doc'd prior to 7.0)
    //> @classMethod Log.echo()
    // @include method:class.echo
    // @visibility external
    //<
    echo : function (obj, multiLine, longArrays, showFunctions) {
        if (obj == null) return this.echoLeaf(obj);

        // Avoid attempting to manipulate SGWT Java objects
        if (isc.Browser.isSGWT && window.SmartGWT.isNativeJavaObject(obj)) return obj.toString();

        if (multiLine == null) multiLine = true;

        if (obj.tagName) return this.echoDOM(obj);

        // anything isn't an Array or Object should be handled by echoLeaf.  (Note that typeof
        // [] is "object").  Note we pass a flag telling echoLeaf it shouldn't try to shorten
        // it's result, since it's going to be the entirety of the output.
        if (typeof obj != "object" || isc.isA.Date(obj)) return this.echoLeaf(obj, true);

        // echo entire arrays rather than just their properties
        if (isc.isAn.Array(obj)) {
            var output = (longArrays ? "[\n" : "[");
            for (var i = 0; i < obj.length; i++) {
                // echo each item either as a leaf or as a full property map
                output += (longArrays ? this.echo(obj[i], multiLine) : this.echoLeaf(obj[i]));
                if (i + 1 < obj.length) output += (longArrays ? ",\n" : ", ");
            }
            output += "\n]";
            return output;
        }
        
        // echo only properties of this instance, as opposed to properties inherited from it's
        // superclass if any
        var output = "{";
		if (obj.getUniqueProperties != null) {
            output = obj.getClassName() + "{";
            obj = obj.getUniqueProperties();
            // avoid a blizzard of function definitions
            if (showFunctions == null) showFunctions = false;
        }
        // if this is not an ISC object, not a DOM element, not atomic (eg String or
        // Number), and not an Array, show its functions as it's something unusual where we'd
        // like to see everything
        if (showFunctions == null) showFunctions = true;

        // echo normal objects
        var propertyNames;
        try {
            propertyNames = isc.getKeys(obj);
        } catch (e) {
            // in IE several XML-related objects through exceptions if you try to for..in on
            // them
            return this.echoLeaf(obj);
        }

        if (isc.Browser.isSafari) {
            
            var isStyle = false,    
                styleDecl = "[object CSSStyleDeclaration]";
            try {
                // many objects JSError on attempts to toString() in Safari
                isStyle = (obj + "" == styleDecl);
            } catch (e) { }
            if (isStyle) {
                output = styleDecl + "{\n[standard props only]\n";
                propertyNames = isc.getKeys(isc.Canvas._getStylePropertyMask());  
                // add 'cssText' as that's not included by default
                propertyNames.add("cssText");
            }
        }

        
        for (var i = 0; i < propertyNames.length; i++) {
            var propertyName = propertyNames[i],
                value;
    
            try {
                // sometimes you can get permission denied on the property access rather than
                // on the attempt to toString() the value
                value = obj[propertyName];
            } catch (e) {
                value = "[error accessing property: " + e + "]";
            }
            if (!showFunctions && isc.isA.Function(value)) continue;
            // don't show internal properties when private identifier obfuscation is on
            if (propertyName.startsWith("$")) continue;

            var echoValue;
            if (propertyName == isc.gwtRef) {
                // don't try to echo references to GWT Java objects.  In hosted / dev mode, our
                // attempt to look for various identifying properties can cause the GWT engine
                // to wedge
                echoValue = "{GWT Java Obj}";
            } else if (propertyName == isc.gwtModule) {
                // Also don't echo references to the GWT module exported to SGWTFactory
                echoValue = "{GWT Module Obj}";
            } else {
                echoValue = this.echoLeaf(value); 
            }
            output += propertyName + ": " + echoValue;
            if (i + 1 < propertyNames.length) output += (multiLine ? ",\r" : ", ");
        }
        output += "}";
        return output;
    },

	//>	@method	Class.echoAll()
    // Like echo(), except that if passed an Array, echoAll() will echo() every element of the
    // Array.
    // This function is available as a static on every ISC Class and as an instance
    // method on every instance of an ISC Class.<br>
    // General best practice is to call the method as "this.echo()" whenever "this" is an
    // instance, or call the static classMethod on the +link{class:Log} class otherwise. 
    //
    // @param obj  (any)  object to echo
    // @return (string) a short string representation of the object
    //
	// @group debug
    // @see echo()
    // @visibility external
    //<
    //> @classMethod Class.echoAll()
    // @include method:class.echoAll
    // @visibility external
    //<
    
    // We also explicitly doc this method on the Log class (the only place it was doc'd prior to 7.0)
    //> @classMethod Log.echoAll()
    // @include method:class.echoAll
    // @visibility external
    //<
    echoAll : function (obj, multiLine) {
        return this.echo(obj, multiLine, true);
    },
    
    echoFull : function (obj) {
        return isc.JSON.encode(obj, {
            prettyPrint:true,
            showDebugOutput:true
        })
    },

    // variant of echo that will be compact: one line, don't recurse into arrays
    echoShort : function (obj) {
        return this.echo(obj, false, false);
    },

    // echoArray - writes out an array with numbered slots.
    echoArray : function (obj) {
        if (!isc.isAn.Array(obj)) return this.echo(obj);
        if (obj.length == 0) return "[empty array]";
        var result = ["["];
        for (var i = 0; i < obj.length; i++) {
            result.addList([i, ":", obj[i], "\n"]);
        }
        result.add("]");
        return result.join("");
    },

    // various properties we want to ignore when echoing DOM elements
    _DOMIgnoreProperties : {

        // we rarely care about the text value of a node
        outerText: false,
        innerText: false,

        // IE proprietary crap
        parentTextEdit: false,
        isTextEdit: false, 
        parentTextEdit: false,
        contentEditable: false,
        canHaveHTML: true, 
        isMultiLine: false, 
        filters: false,
        canHaveChildren: false,
        behaviorUrns: false,
        sourceIndex: false, 
        accelerator: false, 
        textDecorationUnderline: false,
        textDecorationNone: false

		// security exceptions in Moz
		//fullScreen: false, // window.fullScreen

		// error in IE6 (maybe other versions).  You cannot compare the values of these
        // properties to strings.  If you try (eg window.navigator == "") you get "object does
        // not support this property or method", presumably because some native code threw an
        // exception trying to compare against a JS string.
		//clientInformation: false, // window
		//external: false, // window
		//navigator: false, // window
    },

    // echo a DOM Node, avoiding outputting the many constants, functions, and other useless
    // things that appear on all DOM Nodes.  
    // NOTE: in IE, there's no real prototype for DOM elements, so we just suppress things by
    // hand.
    echoDOM : function (node) {
        return this.echoDelta(node, window.Node, node.tagName + this.getIDText(node));
    },

    echoEvent : function (event) {
		// NOTE: in Moz, some of the constants we'd like to omit are on window.KeyEvent and some are
		// on window.Event.  window.KeyEvent has more.
        return this.echoDelta(event, (isc.Browser.isMoz ? window.KeyEvent : window.Event));
    },

    echoDelta : function (obj, base, prefix) {
        if (obj == null) return null;
        
        if (isc.Browser.isIE && isc.isAn.XMLNode(obj)) {
            
            var output = "<" + obj.tagName + " [XMLNode] ";
            var attrs = obj.attributes;
            for (var i = 0; i < attrs.length; i++) {
                var attr = attrs[i];
                if (i > 0) output += " ";
                output += attr.name + "=" + this.echoLeaf(attr.value);
            }
            output += (i > 0 ? " [" : "") + obj.childNodes.length + " child nodes]>";
            return output;
        }

        var output = (prefix || isc.emptyString) + "{",
            propertyNames = isc.getKeys(obj);
        for (var i = 0; i < propertyNames.length; i++) {
            var propertyName = propertyNames[i];

            // skip useless properties found in DOM objects
            if (this._DOMIgnoreProperties[propertyName] != null) continue;

            // skip properties inherited from base class
            if (base != null && base[propertyName] != null) continue;

			// omit multi-letter properties in all caps (typically constants)
			if (propertyName.length > 3 && propertyName.toUpperCase() == propertyName) continue;

            try {
    			var value = obj[propertyName];

                // skip null/empty values
                if (value == null || value == "") continue;

                // skip functions
                if (isc.isA.Function(value)) continue;

                output += propertyName + ": " + this.echoLeaf(obj[propertyName]);
            } catch (e) {
                output += propertyName + ": " + this.echoLeaf(e);
            }
            if (i + 1 < propertyNames.length) output += ", ";
        }
        output += "}";
        return output;
    },

    // echo all the size-related properties of a DOM element.  Won't work in Nav4.
    echoElementSize : function (element) {
        var undefined;
        return this.echo({
            scrollLeft : element.scrollLeft,
            scrollTop : element.scrollTop,
            scrollWidth : element.scrollWidth,
            scrollHeight : element.scrollHeight,
            clientWidth : undefined,
            clientHeight : undefined,
            offsetWidth : element.offsetWidth,
            offsetHeight : element.offsetHeight,
            styleLeft : element.style.left,
            styleTop : element.style.top,
            styleWidth : element.style.width,
            styleHeight : element.style.height,
            styleClip : element.style.clip
        });
    }
});

// make methods available on any class or instance
isc.Class.addProperties(isc._debug);
isc.Class.addClassProperties(isc._debug);



