exceptionless.universal.js

/**
 * https://github.com/csnover/TraceKit
 * @license MIT
 * @namespace TraceKit
 */
(function(window, undefined) {
if (!window) {
    return;
}

var TraceKit = {};
var _oldTraceKit = window.TraceKit;

// global reference to slice
var _slice = [].slice;
var UNKNOWN_FUNCTION = '?';

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error#Error_types
var ERROR_TYPES_RE = /^(?:[Uu]ncaught (?:exception: )?)?(?:((?:Eval|Internal|Range|Reference|Syntax|Type|URI|)Error): )?(.*)$/;

/**
 * A better form of hasOwnProperty<br/>
 * Example: `_has(MainHostObject, property) === true/false`
 *
 * @param {Object} object to check property
 * @param {string} key to check
 * @return {Boolean} true if the object has the key and it is not inherited
 */
function _has(object, key) {
    return Object.prototype.hasOwnProperty.call(object, key);
}

/**
 * Returns true if the parameter is undefined<br/>
 * Example: `_isUndefined(val) === true/false`
 *
 * @param {*} what Value to check
 * @return {Boolean} true if undefined and false otherwise
 */
function _isUndefined(what) {
    return typeof what === 'undefined';
}

/**
 * Export TraceKit out to another variable<br/>
 * Example: `var TK = TraceKit.noConflict()`
 * @return {Object} The TraceKit object
 * @memberof TraceKit
 */
TraceKit.noConflict = function noConflict() {
    window.TraceKit = _oldTraceKit;
    return TraceKit;
};

/**
 * Wrap any function in a TraceKit reporter<br/>
 * Example: `func = TraceKit.wrap(func);`
 *
 * @param {Function} func Function to be wrapped
 * @return {Function} The wrapped func
 * @memberof TraceKit
 */
TraceKit.wrap = function traceKitWrapper(func) {
    function wrapped() {
        try {
            return func.apply(this, arguments);
        } catch (e) {
            TraceKit.report(e);
            throw e;
        }
    }
    return wrapped;
};

/**
 * Cross-browser processing of unhandled exceptions
 *
 * Syntax:
 * ```js
 *   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 TraceKit.StackTrace object as described in the
 * TraceKit.computeStackTrace docs.
 *
 * @memberof TraceKit
 * @namespace
 */
TraceKit.report = (function reportModuleWrapper() {
    var handlers = [],
        lastException = null,
        lastExceptionStack = null;

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

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

        if (handlers.length === 0) {
            window.onerror = _oldOnerrorHandler;
            _onErrorHandlerInstalled = false;
        }
    }

    /**
     * Dispatch stack information to all handlers.
     * @param {TraceKit.StackTrace} stack
     * @param {boolean} isWindowError Is this a top-level window error?
     * @param {Error=} error The error that's being handled (if available, null otherwise)
     * @memberof TraceKit.report
     * @throws An exception if an error occurs while calling an handler.
     */
    function notifyHandlers(stack, isWindowError, error) {
        var exception = null;
        if (isWindowError && !TraceKit.collectWindowErrors) {
          return;
        }
        for (var i in handlers) {
            if (_has(handlers, i)) {
                try {
                    handlers[i](stack, isWindowError, error);
                } catch (inner) {
                    exception = inner;
                }
            }
        }

        if (exception) {
            throw exception;
        }
    }

    var _oldOnerrorHandler, _onErrorHandlerInstalled;

    /**
     * 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.
     * @param {(number|string)=} columnNo The column number at which the error occurred.
     * @param {Error=} errorObj The actual Error object.
     * @memberof TraceKit.report
     */
    function traceKitWindowOnError(message, url, lineNo, columnNo, errorObj) {
        var stack = null;

        if (lastExceptionStack) {
            TraceKit.computeStackTrace.augmentStackTraceWithInitialElement(lastExceptionStack, url, lineNo, message);
    	    processLastException();
        } else if (errorObj) {
            stack = TraceKit.computeStackTrace(errorObj);
            notifyHandlers(stack, true, errorObj);
        } else {
            var location = {
              'url': url,
              'line': lineNo,
              'column': columnNo
            };

            var name;
            var msg = message; // must be new var or will modify original `arguments`
            if ({}.toString.call(message) === '[object String]') {
                var groups = message.match(ERROR_TYPES_RE);
                if (groups) {
                    name = groups[1];
                    msg = groups[2];
                }
            }

            location.func = TraceKit.computeStackTrace.guessFunctionName(location.url, location.line);
            location.context = TraceKit.computeStackTrace.gatherContext(location.url, location.line);
            stack = {
                'name': name,
                'message': msg,
                'mode': 'onerror',
                'stack': [location]
            };

            notifyHandlers(stack, true, null);
        }

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

        return false;
    }

    /**
     * Install a global onerror handler
     * @memberof TraceKit.report
     */
    function installGlobalHandler() {
        if (_onErrorHandlerInstalled === true) {
            return;
        }

        _oldOnerrorHandler = window.onerror;
        window.onerror = traceKitWindowOnError;
        _onErrorHandlerInstalled = true;
    }

    /**
     * Process the most recent exception
     * @memberof TraceKit.report
     */
    function processLastException() {
        var _lastExceptionStack = lastExceptionStack,
            _lastException = lastException;
        lastExceptionStack = null;
        lastException = null;
        notifyHandlers(_lastExceptionStack, false, _lastException);
    }

    /**
     * Reports an unhandled Error to TraceKit.
     * @param {Error} ex
     * @memberof TraceKit.report
     * @throws An exception if an incomplete stack trace is detected (old IE browsers).
     */
    function report(ex) {
        if (lastExceptionStack) {
            if (lastException === ex) {
                return; // already caught by an inner catch block, ignore
            } else {
              processLastException();
            }
        }

        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
        setTimeout(function () {
            if (lastException === ex) {
                processLastException();
            }
        }, (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;
}());

/**
 * An object representing a single stack frame.
 * @typedef {Object} StackFrame
 * @property {string} url The JavaScript or HTML file URL.
 * @property {string} func The function name, or empty for anonymous functions (if guessing did not work).
 * @property {string[]?} args The arguments passed to the function, if known.
 * @property {number=} line The line number, if known.
 * @property {number=} column The column number, if known.
 * @property {string[]} context An array of source code lines; the middle element corresponds to the correct line#.
 * @memberof TraceKit
 */

/**
 * An object representing a JavaScript stack trace.
 * @typedef {Object} StackTrace
 * @property {string} name The name of the thrown exception.
 * @property {string} message The exception error message.
 * @property {TraceKit.StackFrame[]} stack An array of stack frames.
 * @property {string} mode 'stack', 'stacktrace', 'multiline', 'callers', 'onerror', or 'failed' -- method used to collect the stack trace.
 * @memberof TraceKit
 */

/**
 * TraceKit.computeStackTrace: cross-browser stack traces in JavaScript
 *
 * Syntax:
 *   ```js
 *   s = TraceKit.computeStackTrace.ofCaller([depth])
 *   s = TraceKit.computeStackTrace(exception) // consider using TraceKit.report instead (see below)
 *   ```
 *
 * 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:
 *  ```js
 *     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);
 *     }
 * ```
 * @memberof TraceKit
 * @namespace
 */
TraceKit.computeStackTrace = (function computeStackTraceWrapper() {
    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.
     * @memberof TraceKit.computeStackTrace
     */
    function loadSource(url) {
        if (!TraceKit.remoteFetching) { //Only attempt request if remoteFetching is on.
            return '';
        }
        try {
            var getXHR = function() {
                try {
                    return new window.XMLHttpRequest();
                } catch (e) {
                    // explicitly bubble up the exception if not found
                    return new window.ActiveXObject('Microsoft.XMLHTTP');
                }
            };

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

    /**
     * Retrieves source code from the source code cache.
     * @param {string} url URL of source code.
     * @return {Array.<string>} Source contents.
     * @memberof TraceKit.computeStackTrace
     */
    function getSource(url) {
        if (typeof url !== 'string') {
            return [];
        }

        if (!_has(sourceCache, url)) {
            // URL needs to be able to fetched within the acceptable domain.  Otherwise,
            // cross-domain errors will be triggered.
            /*
                Regex matches:
                0 - Full Url
                1 - Protocol
                2 - Domain
                3 - Port (Useful for internal applications)
                4 - Path
            */
            var source = '';
            var domain = '';
            try { domain = window.document.domain; } catch (e) { }
            var match = /(.*)\:\/\/([^:\/]+)([:\d]*)\/{0,1}([\s\S]*)/.exec(url);
            if (match && match[2] === domain) {
                source = loadSource(url);
            }
            sourceCache[url] = source ? 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.
     * @memberof TraceKit.computeStackTrace
     */
    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 UNKNOWN_FUNCTION;
        }

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

        return UNKNOWN_FUNCTION;
    }

    /**
     * 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 center around for context.
     * @return {?Array.<string>} Lines of source code.
     * @memberof TraceKit.computeStackTrace
     */
    function gatherContext(url, line) {
        var source = getSource(url);

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

        var context = [],
            // linesBefore & linesAfter are inclusive with the offending line.
            // if linesOfContext is even, there will be one extra line
            //   *before* the offending line.
            linesBefore = Math.floor(TraceKit.linesOfContext / 2),
            // Add one extra line if linesOfContext is odd
            linesAfter = linesBefore + (TraceKit.linesOfContext % 2),
            start = Math.max(0, line - linesBefore - 1),
            end = Math.min(source.length, line + linesAfter - 1);

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

        for (var i = start; i < end; ++i) {
            if (!_isUndefined(source[i])) {
                context.push(source[i]);
            }
        }

        return context.length > 0 ? 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.
     * @memberof TraceKit.computeStackTrace
     */
    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.
     * @memberof TraceKit.computeStackTrace
     */
    function escapeCodeAsRegExpForMatchingInsideHTML(body) {
        return escapeRegExp(body).replace('<', '(?:<|&lt;)').replace('>', '(?:>|&gt;)').replace('&', '(?:&|&amp;)').replace('"', '(?:"|&quot;)').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.
     * @memberof TraceKit.computeStackTrace
     */
    function findSourceInUrls(re, urls) {
        var source, m;
        for (var i = 0, j = urls.length; i < j; ++i) {
            if ((source = getSource(urls[i])).length) {
                source = source.join('\n');
                if ((m = re.exec(source))) {

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

        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.
     * @memberof TraceKit.computeStackTrace
     */
    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.
     * @memberof TraceKit.computeStackTrace
     */
    function findSourceByFunctionBody(func) {
        if (_isUndefined(window && window.document)) {
            return;
        }

        var urls = [window.location.href],
            scripts = window.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.columnNumber = 69
    // 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 {?TraceKit.StackTrace} Stack trace information.
     * @memberof TraceKit.computeStackTrace
     */
    function computeStackTraceFromStackProp(ex) {
        if (!ex.stack) {
            return null;
        }

        var chrome = /^\s*at (.*?) ?\(((?:file|https?|blob|chrome-extension|native|eval|webpack|<anonymous>|\/).*?)(?::(\d+))?(?::(\d+))?\)?\s*$/i,
            gecko = /^\s*(.*?)(?:\((.*?)\))?(?:^|@)((?:file|https?|blob|chrome|webpack|resource|\[native).*?|[^@]*bundle)(?::(\d+))?(?::(\d+))?\s*$/i,
            winjs = /^\s*at (?:((?:\[object object\])?.+) )?\(?((?:file|ms-appx|https?|webpack|blob):.*?):(\d+)(?::(\d+))?\)?\s*$/i,

            // Used to additionally parse URL/line/column from eval frames
            isEval,
            geckoEval = /(\S+) line (\d+)(?: > eval line \d+)* > eval/i,
            chromeEval = /\((\S*)(?::(\d+))(?::(\d+))\)/,

            lines = ex.stack.split('\n'),
            stack = [],
            submatch,
            parts,
            element,
            reference = /^(.*) is undefined$/.exec(ex.message);

        for (var i = 0, j = lines.length; i < j; ++i) {
            if ((parts = chrome.exec(lines[i]))) {
                var isNative = parts[2] && parts[2].indexOf('native') === 0; // start of line
                isEval = parts[2] && parts[2].indexOf('eval') === 0; // start of line
                if (isEval && (submatch = chromeEval.exec(parts[2]))) {
                    // throw out eval line/column and use top-most line/column number
                    parts[2] = submatch[1]; // url
                    parts[3] = submatch[2]; // line
                    parts[4] = submatch[3]; // column
                }
                element = {
                    'url': !isNative ? parts[2] : null,
                    'func': parts[1] || UNKNOWN_FUNCTION,
                    'args': isNative ? [parts[2]] : [],
                    'line': parts[3] ? +parts[3] : null,
                    'column': parts[4] ? +parts[4] : null
                };
            } else if ( parts = winjs.exec(lines[i]) ) {
                element = {
                    'url': parts[2],
                    'func': parts[1] || UNKNOWN_FUNCTION,
                    'args': [],
                    'line': +parts[3],
                    'column': parts[4] ? +parts[4] : null
                };
            } else if ((parts = gecko.exec(lines[i]))) {
                isEval = parts[3] && parts[3].indexOf(' > eval') > -1;
                if (isEval && (submatch = geckoEval.exec(parts[3]))) {
                    // throw out eval line/column and use top-most line number
                    parts[3] = submatch[1];
                    parts[4] = submatch[2];
                    parts[5] = null; // no column when eval
                } else if (i === 0 && !parts[5] && !_isUndefined(ex.columnNumber)) {
                    // FireFox uses this awesome columnNumber property for its top frame
                    // Also note, Firefox's column number is 0-based and everything else expects 1-based,
                    // so adding 1
                    // NOTE: this hack doesn't work if top-most frame is eval
                    stack[0].column = ex.columnNumber + 1;
                }
                element = {
                    'url': parts[3],
                    'func': parts[1] || UNKNOWN_FUNCTION,
                    'args': parts[2] ? parts[2].split(',') : [],
                    'line': parts[4] ? +parts[4] : null,
                    'column': parts[5] ? +parts[5] : null
                };
            } else {
                continue;
            }

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

            element.context = element.line ? gatherContext(element.url, element.line) : null;
            stack.push(element);
        }

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

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

        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 {?TraceKit.StackTrace} Stack trace information.
     * @memberof TraceKit.computeStackTrace
     */
    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;
        if (!stacktrace) {
            return;
        }

        var opera10Regex = / line (\d+).*script (?:in )?(\S+)(?:: in function (\S+))?$/i,
            opera11Regex = / line (\d+), column (\d+)\s*(?:in (?:<anonymous function: ([^>]+)>|([^\)]+))\((.*)\))? in (.*):\s*$/i,
            lines = stacktrace.split('\n'),
            stack = [],
            parts;

        for (var line = 0; line < lines.length; line += 2) {
            var element = null;
            if ((parts = opera10Regex.exec(lines[line]))) {
                element = {
                    'url': parts[2],
                    'line': +parts[1],
                    'column': null,
                    'func': parts[3],
                    'args':[]
                };
            } else if ((parts = opera11Regex.exec(lines[line]))) {
                element = {
                    'url': parts[6],
                    'line': +parts[1],
                    'column': +parts[2],
                    'func': parts[3] || parts[4],
                    'args': parts[5] ? parts[5].split(',') : []
                };
            }

            if (element) {
                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[line + 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 {?TraceKit.StackTrace} Stack information.
     * @memberof TraceKit.computeStackTrace
     */
    function computeStackTraceFromOperaMultiLineMessage(ex) {
        // TODO: Clean this function up
        // 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|https?|blob)\S+)(?:: in function (\S+))?\s*$/i,
            lineRE2 = /^\s*Line (\d+) of inline#(\d+) script in ((?:file|https?|blob)\S+)(?:: in function (\S+))?\s*$/i,
            lineRE3 = /^\s*Line (\d+) of function script\s*$/i,
            stack = [],
            scripts = (window && window.document && window.document.getElementsByTagName('script')),
            inlineScriptBlocks = [],
            parts;

        for (var s in scripts) {
            if (_has(scripts, s) && !scripts[s].src) {
                inlineScriptBlocks.push(scripts[s]);
            }
        }

        for (var line = 2; line < lines.length; line += 2) {
            var item = null;
            if ((parts = lineRE1.exec(lines[line]))) {
                item = {
                    'url': parts[2],
                    'func': parts[3],
                    'args': [],
                    'line': +parts[1],
                    'column': null
                };
            } else if ((parts = lineRE2.exec(lines[line]))) {
                item = {
                    'url': parts[3],
                    'func': parts[4],
                    'args': [],
                    'line': +parts[1],
                    'column': null // TODO: Check to see if inline#1 (+parts[2]) points to the script number or column number.
                };
                var relativeLine = (+parts[1]); // relative to the start of the <SCRIPT> block
                var script = inlineScriptBlocks[parts[2] - 1];
                if (script) {
                    var 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[line]))) {
                var url = window.location.href.replace(/#.*$/, '');
                var re = new RegExp(escapeCodeAsRegExpForMatchingInsideHTML(lines[line + 1]));
                var src = findSourceInUrls(re, [url]);
                item = {
                    'url': url,
                    'func': '',
                    'args': [],
                    'line': src ? src.line : parts[1],
                    'column': null
                };
            }

            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[line + 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[line + 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.