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* 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
* 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
* 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
* 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 = [], lastArgs = null, 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); } } } /** * Dispatch stack information to all handlers. * @param {TraceKit.StackTrace} stack * @param {boolean} isWindowError Is this a top-level window error? * @memberof TraceKit.report * @throws An exception if an error occurs while calling an handler. */ function notifyHandlers(stack, isWindowError) { var exception = null; if (isWindowError && !TraceKit.collectWindowErrors) { return; } for (var i in handlers) { if (_has(handlers, i)) { try { handlers[i].apply(null, [stack].concat(_slice.call(arguments, 2))); } 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); } else { var location = { 'url': url, 'line': lineNo, 'column': columnNo }; 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, true); } 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, _lastArgs = lastArgs; lastArgs = null; lastExceptionStack = null; lastException = null; notifyHandlers.apply(null, [_lastExceptionStack, false].concat(_lastArgs)); } /** * 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; lastArgs = _slice.call(arguments, 1); // 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) { 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.} 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 centre * around for context. * @return {?Array.} 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('<', '(?:<|<)').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.} urls A list of URLs to search. * @return {?Object.} 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) { // 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. * @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.} 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 (.*?) ?\(((?:file|https?|blob|chrome-extension|native|webpack|eval).*?)(?::(\d+))?(?::(\d+))?\)?\s*$/i, gecko = /^\s*(.*?)(?:\((.*?)\))?(?:^|@)((?:file|https?|blob|chrome|webpack|\[native).*?)(?::(\d+))?(?::(\d+))?\s*$/i, winjs = /^\s*at (?:((?:\[object object\])?.+) )?\(?((?:ms-appx|https?|webpack|blob):.*?):(\d+)(?::(\d+))?\)?\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 = chrome.exec(lines[i]))) { var isNative = parts[2] && parts[2].indexOf('native') !== -1; 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]))) { 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); } if (element.line) { element.context = gatherContext(element.url, element.line); } 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); } else if (!stack[0].column && !_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 stack[0].column = ex.columnNumber + 1; } 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 (?:]+)>|([^\)]+))\((.*)\))? 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