text:
var TraceKit = {};

/**
 * TraceKit.report: cross-browser processing of unhandled exceptions
 *
 * Syntax:
 *   TraceKit.report.subscribe(function(stackInfo) { ... })
 *   TraceKit.report.unsubscribe(function(stackInfo) { ... })
 *   TraceKit.report(exception)
 *   try { ...code... } catch(ex) { TraceKit.report(ex); }
 *
 * Supports:
 *   - Firefox: full stack trace with line numbers, plus column number
 *              on top frame; column number is not guaranteed
 *   - Opera:   full stack trace with line and column numbers
 *   - Chrome:  full stack trace with line and column numbers
 *   - Safari:  line and column number for the top frame only; some frames
 *              may be missing, and column number is not guaranteed
 *   - IE:      line and column number for the top frame only; some frames
 *              may be missing, and column number is not guaranteed
 *
 * In theory, TraceKit should work on all of the following versions:
 *   - IE5.5+ (only 8.0 tested)
 *   - Firefox 0.9+ (only 3.5+ tested)
 *   - Opera 7+ (only 10.50 tested; versions 9 and earlier may require
 *     Exceptions Have Stacktrace to be enabled in opera:config)
 *   - Safari 3+ (only 4+ tested)
 *   - Chrome 1+ (only 5+ tested)
 *   - Konqueror 3.5+ (untested)
 *
 * Requires TraceKit.computeStackTrace.
 *
 * Tries to catch all unhandled exceptions and report them to the
 * subscribed handlers. Please note that TraceKit.report will rethrow the
 * exception. This is REQUIRED in order to get a useful stack trace in IE.
 * If the exception does not reach the top of the browser, you will only
 * get a stack trace from the point where TraceKit.report was called.
 *
 * Handlers receive a stackInfo object as described in the
 * TraceKit.computeStackTrace docs.
 */
TraceKit.report = (function () {
    var handlers = [],
        lastException = null,
        lastExceptionStack = null,
        lastHandledException = null;

    /**
     * Add a crash handler.
     * @param {Function} handler
     */
    function subscribe(handler) {
        handlers.push(handler);
    }

    /**
     * Remove a crash handler.
     * @param {Function} handler
     */
    function unsubscribe(handler) {
        for (var i = handlers.length - 1; i >= 0; --i) {
            if (handlers[i] === handler) {
                handlers.splice(i, 1);
            }
        }
    }

    /**
     * Dispatch stack information to all handlers.
     * @param {Object.<string, *>} stack
     */
    function notifyHandlers(stack) {
        var exception = null;
        for (var i in handlers) {
            if (handlers.hasOwnProperty(i)) {
                try {
                    handlers[i](stack);
                }
                catch (inner) {
                    exception = inner;
                }
            }
        }

        if (exception) {
            throw exception;
        }
    }

    var _oldOnerrorHandler = window.onerror;

    /**
     * Ensures all global unhandled exceptions are recorded.
     * Supported by Gecko and IE.
     * @param {string} message Error message.
     * @param {string} url URL of script that generated the exception.
     * @param {(number|string)} lineNo The line number at which the error
     * occurred.
     */
    window.onerror = function (message, url, lineNo) {
        if (lastHandledException) {
            lastHandledException = null;
            return false; // don't let it bubble up and actually cause an error in the browser after the first time.
        }
        var stack = null;

        if (lastExceptionStack) {
            TraceKit.computeStackTrace.augmentStackTraceWithInitialElement(lastExceptionStack, url, lineNo, message);
            stack = lastExceptionStack;
            lastExceptionStack = null;
            lastException = null;
        }
        else {
            var location = { 'url': url, 'line': lineNo };
            location.func = TraceKit.computeStackTrace.guessFunctionName(location.url, location.line);
            location.context = TraceKit.computeStackTrace.gatherContext(location.url, location.line);
            stack = { 'mode': 'onerror', 'message': message, 'stack': [ location ] };
        }

        notifyHandlers(stack);

        if (_oldOnerrorHandler) {
            return _oldOnerrorHandler.apply(this, arguments);
        }

        // let it bubble up and actually cause an error in the browser
        return;
    };

    /**
     * Reports an unhandled Error to TraceKit.
     * @param {Error} ex
     */
    function report(ex) {
        if (lastHandledException === ex) {
            return;
        }
        if (lastExceptionStack) {
            if (lastException === ex) {
                return; // already caught by an inner catch block, ignore
            }
            else {
                var s = lastExceptionStack;
                lastExceptionStack = null;
                lastException = null;
                notifyHandlers(s);
            }
        }

        var stack = TraceKit.computeStackTrace(ex);
        lastExceptionStack = stack;
        lastException = ex;

        // If the stack trace is incomplete, wait for 2 seconds for
        // slow slow IE to see if onerror occurs or not before reporting
        // this exception; otherwise, we will end up with an incomplete
        // stack trace
        window.setTimeout(function () {
            if (lastException === ex) {
                lastExceptionStack = null;
                lastException = null;
                lastHandledException = ex;
                notifyHandlers(stack);
                throw ex;
            }
        }, (stack.incomplete ? 2000 : 0));

        throw ex; // re-throw to propagate to the top level (and cause window.onerror)
    }

    report.subscribe = subscribe;
    report.unsubscribe = unsubscribe;
    return report;
}());

/**
 * TraceKit.computeStackTrace: cross-browser stack traces in JavaScript
 *
 * Syntax:
 *   s = TraceKit.computeStackTrace.ofCaller([depth])
 *   s = TraceKit.computeStackTrace(exception) // consider using TraceKit.report instead (see below)
 * Returns:
 *   s.name              - exception name
 *   s.message           - exception message
 *   s.stack[i].url      - JavaScript or HTML file URL
 *   s.stack[i].func     - function name, or empty for anonymous functions (if guessing did not work)
 *   s.stack[i].args     - arguments passed to the function, if known
 *   s.stack[i].line     - line number, if known
 *   s.stack[i].column   - column number, if known
 *   s.stack[i].context  - an array of source code lines; the middle element corresponds to the correct line#
 *   s.mode              - 'stack', 'stacktrace', 'multiline', 'callers', 'onerror', or 'failed' -- method used to collect the stack trace
 *
 * Supports:
 *   - Firefox:  full stack trace with line numbers and unreliable column
 *               number on top frame
 *   - Opera 10: full stack trace with line and column numbers
 *   - Opera 9-: full stack trace with line numbers
 *   - Chrome:   full stack trace with line and column numbers
 *   - Safari:   line and column number for the topmost stacktrace element
 *               only
 *   - IE:       no line numbers whatsoever
 *
 * Tries to guess names of anonymous functions by looking for assignments
 * in the source code. In IE and Safari, we have to guess source file names
 * by searching for function bodies inside all page scripts. This will not
 * work for scripts that are loaded cross-domain.
 * Here be dragons: some function names may be guessed incorrectly, and
 * duplicate functions may be mismatched.
 *
 * TraceKit.computeStackTrace should only be used for tracing purposes.
 * Logging of unhandled exceptions should be done with TraceKit.report,
 * which builds on top of TraceKit.computeStackTrace and provides better
 * IE support by utilizing the window.onerror event to retrieve information
 * about the top of the stack.
 *
 * Note: In IE and Safari, no stack trace is recorded on the Error object,
 * so computeStackTrace instead walks its *own* chain of callers.
 * This means that:
 *  * in Safari, some methods may be missing from the stack trace;
 *  * in IE, the topmost function in the stack trace will always be the
 *    caller of computeStackTrace.
 *
 * This is okay for tracing (because you are likely to be calling
 * computeStackTrace from the function you want to be the topmost element
 * of the stack trace anyway), but not okay for logging unhandled
 * exceptions (because your catch block will likely be far away from the
 * inner function that actually caused the exception).
 *
 * Tracing example:
 *     function trace(message) {
 *         var stackInfo = TraceKit.computeStackTrace.ofCaller();
 *         var data = message + "\n";
 *         for(var i in stackInfo.stack) {
 *             var item = stackInfo.stack[i];
 *             data += (item.func || '[anonymous]') + "() in " + item.url + ":" + (item.line || '0') + "\n";
 *         }
 *         if (window.console)
 *             console.info(data);
 *         else
 *             alert(data);
 *     }
 */
TraceKit.computeStackTrace = (function () {
    var debug = false, sourceCache = {};

    /**
     * Attempts to retrieve source code via XMLHttpRequest, which is used
     * to look up anonymous function names.
     * @param {string} url URL of source code.
     * @return {string} Source contents.
     */
    function loadSource(url) {
        try {
            if (XMLHttpRequest === undefined) { // IE 5.x-6.x:
                XMLHttpRequest = function () {
                    try { return new ActiveXObject("Msxml2.XMLHTTP.6.0"); } catch(e) {}
                    try { return new ActiveXObject("Msxml2.XMLHTTP.3.0"); } catch(e) {}
                    try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) {}
                    try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {}
                    throw new Error('No XHR.');
                };
            }

            var request = new XMLHttpRequest();
            request.open('GET', url, false);
            request.send('');
            return request.responseText;
        }
        catch (e) {
            return '';
        }
    }

    function parseUrl(url) {
        var a = document.createElement('a');
        a.href = url;
        return {
            source: url,
            host: a.host,
            hostname: a.hostname,
            port: a.port
        };
    }

    /**
     * Retrieves source code from the source code cache.
     * @param {string} url URL of source code.
     * @return {Array.<string>} Source contents.
     */
    function getSource(url) {
        // Don't bother retrieving the source anymore. Useless since we minify JS.
        //return '';
        if (!sourceCache.hasOwnProperty(url)) {
            var source;
            // Check same origin.
            if (document.location.host != parseUrl(url).host) {
                source = '';
            } else {
                source = loadSource(url);
            }
            sourceCache[url] = source.length ? source.split("\n") : [];
        }

        return sourceCache[url];
    }

    /**
     * Tries to use an externally loaded copy of source code to determine
     * the name of a function by looking at the name of the variable it was
     * assigned to, if any.
     * @param {string} url URL of source code.
     * @param {(string|number)} lineNo Line number in source code.
     * @return {string} The function name, if discoverable.
     */
    function guessFunctionName(url, lineNo) {
        var reFunctionArgNames = /function ([^(]*)\(([^)]*)\)/,
            reGuessFunction = /['"]?([0-9A-Za-z$_]+)['"]?\s*[:=]\s*(function|eval|new Function)/,
            line = '',
            maxLines = 10,
            source = getSource(url),
            m;

        if (!source.length) {
            return '?';
        }

        // Walk backwards from the first line in the function until we find the line which
        // matches the pattern above, which is the function definition
        for (var i = 0; i < maxLines; ++i) {
            line = source[lineNo - i] + line;

            if (line !== undefined) {
                if ((m = reGuessFunction.exec(line))) {
                    return m[1];
                }
                else if ((m = reFunctionArgNames.exec(line))) {
                    return m[1];
                }
            }
        }

        return '?';
    }

    /**
     * Retrieves the surrounding lines from where an exception occurred.
     * @param {string} url URL of source code.
     * @param {(string|number)} line Line number in source code to centre
     * around for context.
     * @return {?Array.<string>} Lines of source code.
     */
    function gatherContext(url, line) {
        var source = getSource(url),
            context = [],
            hasContext = false;

        if (!source.length) {
            return null;
        }

        line -= 1; // convert to 0-based index

        for (var i = line - 2, j = line + 2; i < j; ++i) {
            context.push(source[i]);
            if (source[i] !== undefined) {
                hasContext = true;
            }
        }

        return hasContext ? context : null;
    }

    /**
     * Escapes special characters, except for whitespace, in a string to be
     * used inside a regular expression as a string literal.
     * @param {string} text The string.
     * @return {string} The escaped string literal.
     */
    function escapeRegExp(text) {
        return text.replace(/[\-\[\]{}()*+?.,\\\^$|#]/g, '\\$&');
    }

    /**
     * Escapes special characters in a string to be used inside a regular
     * expression as a string literal. Also ensures that HTML entities will
     * be matched the same as their literal friends.
     * @param {string} body The string.
     * @return {string} The escaped string.
     */
    function escapeCodeAsRegExpForMatchingInsideHTML(body) {
        return escapeRegExp(body).replace('<', '(?:<|<)').replace('>', '(?:>|>)')
                .replace('&', '(?:&|&)').replace('"', '(?:"|")').replace(/\s+/g, '\\s+');
    }

    /**
     * Determines where a code fragment occurs in the source code.
     * @param {RegExp} re The function definition.
     * @param {Array.<string>} urls A list of URLs to search.
     * @return {?Object.<string, (string|number)>} An object containing
     * the url, line, and column number of the defined function.
     */
    function findSourceInUrls(re, urls) {
        var source, m;
        for (var i = 0, j = urls.length; i < j; ++i) {
            // console.log('searching', urls[i]);
            if ((source = getSource(urls[i])).length) {
                source = source.join("\n");
                if ((m = re.exec(source))) {
                    // console.log('Found function in ' + urls[i]);

                    return {
                        'url': urls[i],
                        'line': source.substring(0, m.index).split("\n").length,
                        'column': m.index - source.lastIndexOf("\n", m.index) - 1
                    };
                }
            }
        }

        // console.log('no match');

        return null;
    }

    /**
     * Determines at which column a code fragment occurs on a line of the
     * source code.
     * @param {string} fragment The code fragment.
     * @param {string} url The URL to search.
     * @param {(string|number)} line The line number to examine.
     * @return {?number} The column number.
     */
    function findSourceInLine(fragment, url, line) {
        var source = getSource(url),
            re = new RegExp('\\b' + escapeRegExp(fragment) + '\\b'),
            m;

        line -= 1;

        if (source && source.length > line && (m = re.exec(source[line]))) {
            return m.index;
        }

        return null;
    }

    /**
     * Determines where a function was defined within the source code.
     * @param {(Function|string)} func A function reference or serialized
     * function definition.
     * @return {?Object.<string, (string|number)>} An object containing
     * the url, line, and column number of the defined function.
     */
    function findSourceByFunctionBody(func) {
        var urls = [ window.location.href ],
            scripts = document.getElementsByTagName("script"),
            body,
            code = '' + func,
            codeRE = /^function(?:\s+([\w$]+))?\s*\(([\w\s,]*)\)\s*\{\s*(\S[\s\S]*\S)\s*\}\s*$/,
            eventRE = /^function on([\w$]+)\s*\(event\)\s*\{\s*(\S[\s\S]*\S)\s*\}\s*$/,
            re,
            parts,
            result;

        for (var i = 0; i < scripts.length; ++i) {
            var script = scripts[i];
            if (script.src) {
                urls.push(script.src);
            }
        }

        if (!(parts = codeRE.exec(code))) {
            re = new RegExp(escapeRegExp(code).replace(/\s+/g, '\\s+'));
        }

        // not sure if this is really necessary, but I don't have a test
        // corpus large enough to confirm that and it was in the original.
        else {
            var name = parts[1] ? '\\s+' + parts[1] : '',
                args = parts[2].split(",").join("\\s*,\\s*");

            body = escapeRegExp(parts[3])
                .replace(/;$/, ';?') // semicolon is inserted if the function ends with a comment
                .replace(/\s+/g, '\\s+');
            re = new RegExp("function" + name + "\\s*\\(\\s*" + args + "\\s*\\)\\s*{\\s*" + body + "\\s*}");
        }

        // look for a normal function definition
        if ((result = findSourceInUrls(re, urls))) {
            return result;
        }

        // look for an old-school event handler function
        if ((parts = eventRE.exec(code))) {
            var event = parts[1];
            body = escapeCodeAsRegExpForMatchingInsideHTML(parts[2]);

            // look for a function defined in HTML as an onXXX handler
            re = new RegExp("on" + event + '=[\\\'"]\\s*' + body + '\\s*[\\\'"]', 'i');

            if ((result = findSourceInUrls(re, urls[0]))) {
                return result;
            }

            // look for ???
            re = new RegExp(body);

            if ((result = findSourceInUrls(re, urls))) {
                return result;
            }
        }

        return null;
    }

    // Contents of Exception in various browsers.
    //
    // SAFARI:
    // ex.message = Can't find variable: qq
    // ex.line = 59
    // ex.sourceId = 580238192
    // ex.sourceURL = http://...
    // ex.expressionBeginOffset = 96
    // ex.expressionCaretOffset = 98
    // ex.expressionEndOffset = 98
    // ex.name = ReferenceError
    //
    // FIREFOX:
    // ex.message = qq is not defined
    // ex.fileName = http://...
    // ex.lineNumber = 59
    // ex.stack = ...stack trace... (see the example below)
    // ex.name = ReferenceError
    //
    // CHROME:
    // ex.message = qq is not defined
    // ex.name = ReferenceError
    // ex.type = not_defined
    // ex.arguments = ['aa']
    // ex.stack = ...stack trace...
    //
    // INTERNET EXPLORER:
    // ex.message = ...
    // ex.name = ReferenceError
    //
    // OPERA:
    // ex.message = ...message... (see the example below)
    // ex.name = ReferenceError
    // ex.opera#sourceloc = 11  (pretty much useless, duplicates the info in ex.message)
    // ex.stacktrace = n/a; see 'opera:config#UserPrefs|Exceptions Have Stacktrace'

    /**
     * Computes stack trace information from the stack property.
     * Chrome and Gecko use this property.
     * @param {Error} ex
     * @return {?Object.<string, *>} Stack trace information.
     */
    function computeStackTraceFromStackProp(ex) {
        if (!ex.stack) {
            return null;
        }

        var chrome = /^\s*at (\S+) \(((?:file|http):.*?):(\d+)(?::(\d+))?\)\s*$/i,
            gecko = /^\s*(\S*)(?:\((.*?)\))?@((?:file|http).*?):(\d+)(?::(\d+))?\s*$/i,
            lines = ex.stack.split("\n"),
            stack = [],
            parts,
            element,
            reference = /^(.*) is undefined$/.exec(ex.message);

        for (var i = 0, j = lines.length; i < j; ++i) {
            if ((parts = gecko.exec(lines[i]))) {
                element = { 'url': parts[3], 'func': parts[1], 'args': parts[2] ? parts[2].split(',') : '', 'line': +parts[4], 'column': parts[5] ? +parts[5] : null };
            }
            else if ((parts = chrome.exec(lines[i]))) {
                element = { 'url': parts[2], 'func': parts[1], 'line': +parts[3], 'column': parts[4] ? +parts[4] : null };
            }
            else {
                continue;
            }

            if (!element.func && element.line) {
                element.func = guessFunctionName(element.url, element.line);
            }

            if (element.line) {
                element.context = gatherContext(element.url, element.line);
            }

            stack.push(element);
        }

        if (stack[0] && stack[0].line && !stack[0].column && reference) {
            stack[0].column = findSourceInLine(reference[1], stack[0].url, stack[0].line);
        }

        if (!stack.length) {
            return null;
        }

        return {
            'mode': 'stack',
            'name': ex.name,
            'message': ex.message,
            'stack': stack
        };
    }

    /**
     * Computes stack trace information from the stacktrace property.
     * Opera 10 uses this property.
     * @param {Error} ex
     * @return {?Object.<string, *>} Stack trace information.
     */
    function computeStackTraceFromStacktraceProp(ex) {
        // Access and store the stacktrace property before doing ANYTHING
        // else to it because Opera is not very good at providing it
        // reliably in other circumstances.
        var stacktrace = ex.stacktrace;

        var testRE = / line (\d+), column (\d+) in (?:<anonymous function: ([^>]+)>|([^\)]+))\((.*)\) in (.*):\s*$/i,
            lines = stacktrace.split("\n"),
            stack = [],
            parts;

        for (var i = 0, j = lines.length; i < j; i += 2) {
            if ((parts = testRE.exec(lines[i]))) {
                var element = { 'line': +parts[1], 'column': +parts[2], 'func': parts[3] || parts[4], 'args': parts[5] ? parts[5].split(',') : [], 'url': parts[6] };

                if (!element.func && element.line) {
                    element.func = guessFunctionName(element.url, element.line);
                }
                if (element.line) {
                    try {
                        element.context = gatherContext(element.url, element.line);
                    }
                    catch (exc) {}
                }

                if (!element.context) {
                    element.context = [ lines[i + 1] ];
                }

                stack.push(element);
            }
        }

        if (!stack.length) {
            return null;
        }

        return {
            'mode': 'stacktrace',
            'name': ex.name,
            'message': ex.message,
            'stack': stack
        };
    }

    /**
     * NOT TESTED.
     * Computes stack trace information from an error message that includes
     * the stack trace.
     * Opera 9 and earlier use this method if the option to show stack
     * traces is turned on in opera:config.
     * @param {Error} ex
     * @return {?Object.<string, *>} Stack information.
     */
    function computeStackTraceFromOperaMultiLineMessage(ex) {
        // Opera includes a stack trace into the exception message. An example is:
        //
        // Statement on line 3: Undefined variable: undefinedFunc
        // Backtrace:
        //   Line 3 of linked script file://localhost/Users/andreyvit/Projects/TraceKit/javascript-client/sample.js: In function zzz
        //         undefinedFunc(a);
        //   Line 7 of inline#1 script in file://localhost/Users/andreyvit/Projects/TraceKit/javascript-client/sample.html: In function yyy
        //           zzz(x, y, z);
        //   Line 3 of inline#1 script in file://localhost/Users/andreyvit/Projects/TraceKit/javascript-client/sample.html: In function xxx
        //           yyy(a, a, a);
        //   Line 1 of function script
        //     try { xxx('hi'); return false; } catch(ex) { TraceKit.report(ex); }
        //   ...

        var lines = ex.message.split('\n');
        if (lines.length < 4) {
            return null;
        }

        var lineRE1 = /^\s*Line (\d+) of linked script ((?:file|http)\S+)(?:: in function (\S+))?\s*$/i,
            lineRE2 = /^\s*Line (\d+) of inline#(\d+) script in ((?:file|http)\S+)(?:: in function (\S+))?\s*$/i,
            lineRE3 = /^\s*Line (\d+) of function script\s*$/i,
            stack = [],
            scripts = document.getElementsByTagName('script'),
            inlineScriptBlocks = [],
            parts,
            i,
            len,
            source;

        for (i in scripts) {
            if (scripts.hasOwnProperty(i) && !scripts[i].src) {
                inlineScriptBlocks.push(scripts[i]);
            }
        }

        for (i = 2, len = lines.length; i < len; i += 2) {
            var item = null;
            if ((parts = lineRE1.exec(lines[i]))) {
                item = { 'url': parts[2], 'func': parts[3], 'line': +parts[1] };
            }
            else if ((parts = lineRE2.exec(lines[i]))) {
                item = { 'url': parts[3], 'func': parts[4] };
                var relativeLine = (+parts[1]);  // relative to the start of the <SCRIPT> block
                var script = inlineScriptBlocks[parts[2] - 1];
                if (script) {
                    source = getSource(item.url);
                    if (source) {
                        source = source.join("\n");
                        var pos = source.indexOf(script.innerText);
                        if (pos >= 0) {
                            item.line = relativeLine + source.substring(0, pos).split("\n").length;
                        }
                    }
                }
            }
            else if ((parts = lineRE3.exec(lines[i]))) {
                var url = window.location.href.replace(/#.*$/, ''), line = parts[1];
                var re = new RegExp(escapeCodeAsRegExpForMatchingInsideHTML(lines[i + 1]));
                source = findSourceInUrls(re, [url]);
                item = { 'url': url, 'line': source ? source.line : line, 'func': '' };
            }

            if (item) {
                if (!item.func) {
                    item.func = guessFunctionName(item.url, item.line);
                }
                var context = gatherContext(item.url, item.line);
                var midline = (context ? context[Math.floor(context.length / 2)] : null);
                if (context && midline.replace(/^\s*/, '') === lines[i + 1].replace(/^\s*/, '')) {
                    item.context = context;
                }
                else {
                    // if (context) alert("Context mismatch. Correct midline:\n" + lines[i+1] + "\n\nMidline:\n" + midline + "\n\nContext:\n" + context.join("\n") + "\n\nURL:\n" + item.url);
                    item.context = [lines[i + 1]];
                }
                stack.push(item);
            }
        }
        if (!stack.length) {
            return null; // could not parse multiline exception message as Opera stack trace
        }

        return {
            'mode': 'multiline',
            'name': ex.name,
            'message': lines[0],
            'stack': stack
        };
    }

    /**
     * Adds information about the first frame to incomplete stack traces.
     * Safari and IE require this to get complete data on the first frame.
     * @param {Object.<string, *>} stackInfo Stack trace information from
     * one of the compute* methods.
     * @param {string} url The URL of the script that caused an error.
     * @param {(number|string)} lineNo The line number of the script that
     * caused an error.
     * @param {string=} message The error generated by the browser, which
     * hopefully contains the name of the object that caused the error.
     * @return {boolean} Whether or not the stack information was
     * augmented.
     */
    function augmentStackTraceWithInitialElement(stackInfo, url, lineNo, message) {
        var initial = {
            'url': url,
            'line': lineNo
        };

        if (initial.url && initial.line) {
            stackInfo.incomplete = false;

            if (!initial.func) {
                initial.func = guessFunctionName(initial.url, initial.line);
            }

            if (!initial.context) {
            initial.context = gatherContext(initial.url, initial.line);
            }

            var reference = / '([^']+)' /.exec(message);
            if (reference) {
                initial.column = findSourceInLine(reference[1], initial.url, initial.line);
            }

            if (stackInfo.stack.length > 0) {
                if (stackInfo.stack[0].url === initial.url) {
                    if (stackInfo.stack[0].line === initial.line) {
                        return false; // already in stack trace
                    }
                    else if (!stackInfo.stack[0].line && stackInfo.stack[0].func === initial.func) {
                        stackInfo.stack[0].line = initial.line;
                        stackInfo.stack[0].context = initial.context;
                        return false;
                    }
                }
            }

            stackInfo.stack.unshift(initial);
            stackInfo.partial = true;
            return true;
        }
        else {
            stackInfo.incomplete = true;
        }

        return false;
    }

    /**
     * Computes stack trace information by walking the arguments.caller
     * chain at the time the exception occurred. This will cause earlier
     * frames to be missed but is the only way to get any stack trace in
     * Safari and IE. The top frame is restored by
     * {@link augmentStackTraceWithInitialElement}.
     * @param {Error} ex
     * @return {?Object.<string, *>} Stack trace information.
     */
    function computeStackTraceByWalkingCallerChain(ex, depth) {
        var functionName = /function\s+([_$a-zA-Z\xA0-\uFFFF][_$a-zA-Z0-9\xA0-\uFFFF]*)?\s*\(/i,
        stack = [],
        funcs = {},
        recursion = false,
        parts,
        item,
        source;

        for (var curr = arguments.callee.caller; curr && !recursion; curr = curr.caller) {
            if (curr === computeStackTrace || curr === TraceKit.report) {
                // console.log('skipping internal function');
                continue;
            }

            item = {
                'url': null,
                'func': '?',
                'line': null,
                'column': null
            };

            if (curr.name) {
                item.func = curr.name;
            }
            else if ((parts = functionName.exec(curr.toString()))) {
                item.func = parts[1];
            }

            if ((source = findSourceByFunctionBody(curr))) {
                item.url = source.url;
                item.line = source.line;

                if (item.func === '?') {
                    item.func = guessFunctionName(item.url, item.line);
                }

                var reference = / '([^']+)' /.exec(ex.message || ex.description);
                if (reference) {
                    item.column = findSourceInLine(reference[1], source.url, source.line);
                }
            }

            if (funcs['' + curr]) {
                item.recursion = true;
            }

            stack.push(item);
        }

        if (depth) {
            // console.log('depth is ' + depth);
            // console.log('stack is ' + stack.length);
            stack.splice(0, depth);
        }

        var result = { 'mode': 'callers', 'name': ex.name, 'message': ex.message, 'stack': stack };
        augmentStackTraceWithInitialElement(result, ex.sourceURL || ex.fileName, ex.line || ex.lineNumber, ex.message || ex.description);
        return result;
    }

    /**
     * Computes a stack trace for an exception.
     * @param {Error} ex
     * @param {(string|number)=} depth
     */
    function computeStackTrace(ex, depth) {
        var stack = null;
        depth = (depth === undefined ? 0 : +depth);

        try {
            // This must be tried first because Opera 10 *destroys*
            // its stacktrace property if you try to access the stack
            // property first!!
            stack = computeStackTraceFromStacktraceProp(ex);
            if (stack) {
                return stack;
            }
        }
        catch (e) {
            if (debug) {
                throw e;
            }
        }

        try {
            stack = computeStackTraceFromStackProp(ex);
            if (stack) {
                return stack;
            }
        }
        catch (e) {
            if (debug) {
                throw e;
            }
        }

        try {
            stack = computeStackTraceFromOperaMultiLineMessage(ex);
            if (stack) {
                return stack;
            }
        }
        catch (e) {
            if (debug) {
                throw e;
            }
        }

        try {
            stack = computeStackTraceByWalkingCallerChain(ex, depth + 1);
            if (stack) {
                return stack;
            }
        }
        catch (e) {
            if (debug) {
                throw e;
            }
        }

        return { 'mode': 'failed' };
    }

    /**
     * Logs a stacktrace starting from the previous call and working down.
     * @param {(number|string)=} depth How many frames deep to trace.
     * @return {Object.<string, *>} Stack trace information.
     */
    function computeStackTraceOfCaller(depth) {
        depth = (depth === undefined ? 0 : +depth) + 1; // "+ 1" because "ofCaller" should drop one frame
        try {
            (0)();
        }
        catch (ex) {
            return computeStackTrace(ex, depth + 1);
        }

        return null;
    }

    computeStackTrace.augmentStackTraceWithInitialElement = augmentStackTraceWithInitialElement;
    computeStackTrace.guessFunctionName = guessFunctionName;
    computeStackTrace.gatherContext = gatherContext;
    computeStackTrace.ofCaller = computeStackTraceOfCaller;

    return computeStackTrace;
}());

/**
 * Extends support for global error handling for asynchronous browser
 * functions. Adopted from Closure Library's errorhandler.js
 */
(function (w) {
	var _helper = function(fnName) {
		var originalFn = w[fnName];
		w[fnName] = function() {

            var args = arguments;
			var originalCallback = args[1];

            // Don't try to process string "callbacks" so that we don't have to eval stuff ourselves.
            if (originalCallback && originalCallback.apply) {
			    // Make a copy of the arguments
			    args = Array.prototype.slice.call(arguments, 0);

			    args[0] = function() {
				    try {
					    return originalCallback.apply(this, arguments);
				    }
				    catch (e) {
					    TraceKit.report(e);
					    throw e;
				    }
			    };
            }

			// IE < 9 doesn't support .call/.apply on setInterval/setTimeout, but it
			// also only supports 2 argument and doesn't care what "this" is, so we
			// can just call the original function directly.
			if (originalFn.apply) {
				return originalFn.apply(this, args);
			}
			else {
				return originalFn(args[0], args[1]);
			}
		};
	};

	_helper('setTimeout');
	_helper('setInterval');
}(window));

/**
 * Extended support for backtraces and global error handling for most
 * asynchronous jQuery functions.
 */
(function ($) {

    // quit if jQuery isn't on the page
    if (!$) {
        return;
    }

    var _oldEventAdd = $.event.add;
    $.event.add = function (elem, types, handler, data) {
        var _handler;

        if (handler.handler) {
            _handler = handler.handler;
            handler.handler = function () {
                try {
                    return _handler.apply(this, arguments);
                }
                catch (e) {
                    TraceKit.report(e);
                    throw e;
                }
            };
        }
        else {
            _handler = handler;
            handler = function () {
                try {
                    return _handler.apply(this, arguments);
                }
                catch (e) {
                    TraceKit.report(e);
                    throw e;
                }
            };
        }

        // If the handler we are attaching doesn't have the same guid as
        // the original, it will never be removed when someone tries to
        // unbind the original function later. Technically as a result of
        // this our guids are no longer globally unique, but whatever, that
        // never hurt anybody RIGHT?!
        if (_handler.guid) {
            handler.guid = _handler.guid;
        }
        else {
            handler.guid = _handler.guid = $.guid++;
        }

        return _oldEventAdd.call(this, elem, types, handler, data);
    };

    var _oldReady = $.fn.ready;
    $.fn.ready = function (fn) {
        var _fn = function () {
            try {
                return fn.apply(this, arguments);
            }
            catch (e) {
                TraceKit.report(e);
                throw e;
            }
        };

        return _oldReady.call(this, _fn);
    };

    var _oldAjax = $.ajax;
    $.fn.ajax = function (s) {
        if ($.isFunction(s.complete)) {
            var _oldComplete = s.complete;
            s.complete = function () {
                try {
                    return _oldComplete.apply(this, arguments);
                }
                catch (e) {
                    TraceKit.report(e);
                    throw e;
                }
            };
        }

        if ($.isFunction(s.error)) {
            var _oldError = s.error;
            s.error = function () {
                try {
                    return _oldError.apply(this, arguments);
                }
                catch (e) {
                    TraceKit.report(e);
                    throw e;
                }
            };
        }

        if ($.isFunction(s.success)) {
            var _oldSuccess = s.success;
            s.success = function () {
                try {
                    return _oldSuccess.apply(this, arguments);
                }
                catch (e) {
                    TraceKit.report(e);
                    throw e;
                }
            };
        }

        try {
            return _oldAjax.call(this, s);
        }
        catch (e) {
            TraceKit.report(e);
            throw e;
        }
    };
}(window.jQuery));