1045 lines
36 KiB
JavaScript
1045 lines
36 KiB
JavaScript
/*
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TraceKit - Cross brower stack traces - github.com/occ/TraceKit
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MIT license
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*/
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var TraceKit = {
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remoteFetching: false,
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collectWindowErrors: true,
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// 3 lines before, the offending line, 3 lines after
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linesOfContext: 7
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};
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// global reference to slice
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var _slice = [].slice;
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var UNKNOWN_FUNCTION = '?';
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/**
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* TraceKit.wrap: Wrap any function in a TraceKit reporter
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* Example: func = TraceKit.wrap(func);
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*
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* @param {Function} func Function to be wrapped
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* @return {Function} The wrapped func
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*/
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TraceKit.wrap = function traceKitWrapper(func) {
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function wrapped() {
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try {
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return func.apply(this, arguments);
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} catch (e) {
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TraceKit.report(e);
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throw e;
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}
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}
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return wrapped;
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};
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/**
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* TraceKit.report: cross-browser processing of unhandled exceptions
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*
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* Syntax:
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* TraceKit.report.subscribe(function(stackInfo) { ... })
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* TraceKit.report.unsubscribe(function(stackInfo) { ... })
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* TraceKit.report(exception)
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* try { ...code... } catch(ex) { TraceKit.report(ex); }
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*
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* Supports:
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* - Firefox: full stack trace with line numbers, plus column number
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* on top frame; column number is not guaranteed
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* - Opera: full stack trace with line and column numbers
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* - Chrome: full stack trace with line and column numbers
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* - Safari: line and column number for the top frame only; some frames
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* may be missing, and column number is not guaranteed
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* - IE: line and column number for the top frame only; some frames
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* may be missing, and column number is not guaranteed
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*
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* In theory, TraceKit should work on all of the following versions:
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* - IE5.5+ (only 8.0 tested)
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* - Firefox 0.9+ (only 3.5+ tested)
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* - Opera 7+ (only 10.50 tested; versions 9 and earlier may require
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* Exceptions Have Stacktrace to be enabled in opera:config)
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* - Safari 3+ (only 4+ tested)
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* - Chrome 1+ (only 5+ tested)
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* - Konqueror 3.5+ (untested)
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*
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* Requires TraceKit.computeStackTrace.
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*
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* Tries to catch all unhandled exceptions and report them to the
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* subscribed handlers. Please note that TraceKit.report will rethrow the
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* exception. This is REQUIRED in order to get a useful stack trace in IE.
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* If the exception does not reach the top of the browser, you will only
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* get a stack trace from the point where TraceKit.report was called.
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*
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* Handlers receive a stackInfo object as described in the
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* TraceKit.computeStackTrace docs.
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*/
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TraceKit.report = (function reportModuleWrapper() {
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var handlers = [],
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lastArgs = null,
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lastException = null,
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lastExceptionStack = null;
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/**
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* Add a crash handler.
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* @param {Function} handler
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*/
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function subscribe(handler) {
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installGlobalHandler();
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handlers.push(handler);
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}
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/**
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* Remove a crash handler.
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* @param {Function} handler
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*/
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function unsubscribe(handler) {
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for (var i = handlers.length - 1; i >= 0; --i) {
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if (handlers[i] === handler) {
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handlers.splice(i, 1);
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}
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}
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}
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/**
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* Remove all crash handlers.
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*/
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function unsubscribeAll() {
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uninstallGlobalHandler();
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handlers = [];
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}
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/**
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* Dispatch stack information to all handlers.
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* @param {Object.<string, *>} stack
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*/
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function notifyHandlers(stack, isWindowError) {
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var exception = null;
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if (isWindowError && !TraceKit.collectWindowErrors) {
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return;
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||
}
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for (var i in handlers) {
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if (hasKey(handlers, i)) {
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||
try {
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handlers[i].apply(null, [stack].concat(_slice.call(arguments, 2)));
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||
} catch (inner) {
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exception = inner;
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||
}
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}
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}
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if (exception) {
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throw exception;
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}
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}
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var _oldOnerrorHandler, _onErrorHandlerInstalled;
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/**
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* Ensures all global unhandled exceptions are recorded.
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* Supported by Gecko and IE.
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* @param {string} message Error message.
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* @param {string} url URL of script that generated the exception.
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* @param {(number|string)} lineNo The line number at which the error
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* occurred.
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* @param {?(number|string)} colNo The column number at which the error
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* occurred.
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* @param {?Error} ex The actual Error object.
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*/
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function traceKitWindowOnError(message, url, lineNo, colNo, ex) {
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var stack = null;
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||
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if (lastExceptionStack) {
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TraceKit.computeStackTrace.augmentStackTraceWithInitialElement(lastExceptionStack, url, lineNo, message);
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processLastException();
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} else if (ex) {
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||
// New chrome and blink send along a real error object
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// Let's just report that like a normal error.
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// See: https://mikewest.org/2013/08/debugging-runtime-errors-with-window-onerror
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stack = TraceKit.computeStackTrace(ex);
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notifyHandlers(stack, true);
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} else {
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var location = {
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||
'url': url,
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'line': lineNo,
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'column': colNo
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};
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location.func = TraceKit.computeStackTrace.guessFunctionName(location.url, location.line);
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location.context = TraceKit.computeStackTrace.gatherContext(location.url, location.line);
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stack = {
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'message': message,
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'url': document.location.href,
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'stack': [location]
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};
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notifyHandlers(stack, true);
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}
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if (_oldOnerrorHandler) {
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return _oldOnerrorHandler.apply(this, arguments);
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}
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return false;
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}
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function installGlobalHandler ()
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{
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if (_onErrorHandlerInstalled) {
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return;
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||
}
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_oldOnerrorHandler = window.onerror;
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window.onerror = traceKitWindowOnError;
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_onErrorHandlerInstalled = true;
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||
}
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function uninstallGlobalHandler ()
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{
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if (!_onErrorHandlerInstalled) {
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||
return;
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||
}
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window.onerror = _oldOnerrorHandler;
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_onErrorHandlerInstalled = false;
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_oldOnerrorHandler = undefined;
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}
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function processLastException() {
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var _lastExceptionStack = lastExceptionStack,
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_lastArgs = lastArgs;
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lastArgs = null;
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lastExceptionStack = null;
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lastException = null;
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notifyHandlers.apply(null, [_lastExceptionStack, false].concat(_lastArgs));
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}
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/**
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* Reports an unhandled Error to TraceKit.
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* @param {Error} ex
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* @param {?boolean} rethrow If false, do not re-throw the exception.
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* Only used for window.onerror to not cause an infinite loop of
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* rethrowing.
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*/
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function report(ex, rethrow) {
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var args = _slice.call(arguments, 1);
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if (lastExceptionStack) {
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if (lastException === ex) {
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return; // already caught by an inner catch block, ignore
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} else {
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processLastException();
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}
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}
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var stack = TraceKit.computeStackTrace(ex);
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lastExceptionStack = stack;
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lastException = ex;
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lastArgs = args;
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// If the stack trace is incomplete, wait for 2 seconds for
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// slow slow IE to see if onerror occurs or not before reporting
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// this exception; otherwise, we will end up with an incomplete
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// stack trace
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window.setTimeout(function () {
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if (lastException === ex) {
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processLastException();
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}
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}, (stack.incomplete ? 2000 : 0));
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if (rethrow !== false) {
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throw ex; // re-throw to propagate to the top level (and cause window.onerror)
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||
}
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}
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report.subscribe = subscribe;
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report.unsubscribe = unsubscribe;
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report.uninstall = unsubscribeAll;
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return report;
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}());
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/**
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* TraceKit.computeStackTrace: cross-browser stack traces in JavaScript
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*
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* Syntax:
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* s = TraceKit.computeStackTrace(exception) // consider using TraceKit.report instead (see below)
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* Returns:
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* s.name - exception name
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* s.message - exception message
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* s.stack[i].url - JavaScript or HTML file URL
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* s.stack[i].func - function name, or empty for anonymous functions (if guessing did not work)
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* s.stack[i].args - arguments passed to the function, if known
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* s.stack[i].line - line number, if known
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* s.stack[i].column - column number, if known
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* s.stack[i].context - an array of source code lines; the middle element corresponds to the correct line#
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*
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* Supports:
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||
* - Firefox: full stack trace with line numbers and unreliable column
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* number on top frame
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* - Opera 10: full stack trace with line and column numbers
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||
* - Opera 9-: full stack trace with line numbers
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* - Chrome: full stack trace with line and column numbers
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||
* - Safari: line and column number for the topmost stacktrace element
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* only
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* - IE: no line numbers whatsoever
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*
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* Tries to guess names of anonymous functions by looking for assignments
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* in the source code. In IE and Safari, we have to guess source file names
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* by searching for function bodies inside all page scripts. This will not
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* work for scripts that are loaded cross-domain.
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* Here be dragons: some function names may be guessed incorrectly, and
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* duplicate functions may be mismatched.
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*
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* TraceKit.computeStackTrace should only be used for tracing purposes.
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* Logging of unhandled exceptions should be done with TraceKit.report,
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* which builds on top of TraceKit.computeStackTrace and provides better
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* IE support by utilizing the window.onerror event to retrieve information
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||
* about the top of the stack.
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*
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||
* Note: In IE and Safari, no stack trace is recorded on the Error object,
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||
* so computeStackTrace instead walks its *own* chain of callers.
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||
* This means that:
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||
* * in Safari, some methods may be missing from the stack trace;
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* * in IE, the topmost function in the stack trace will always be the
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* caller of computeStackTrace.
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*
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||
* This is okay for tracing (because you are likely to be calling
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* computeStackTrace from the function you want to be the topmost element
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* of the stack trace anyway), but not okay for logging unhandled
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* exceptions (because your catch block will likely be far away from the
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* inner function that actually caused the exception).
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*
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||
*/
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TraceKit.computeStackTrace = (function computeStackTraceWrapper() {
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var debug = false,
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sourceCache = {};
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/**
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* Attempts to retrieve source code via XMLHttpRequest, which is used
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* to look up anonymous function names.
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* @param {string} url URL of source code.
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* @return {string} Source contents.
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*/
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function loadSource(url) {
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if (!TraceKit.remoteFetching) { //Only attempt request if remoteFetching is on.
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return '';
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}
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try {
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var getXHR = function() {
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try {
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return new window.XMLHttpRequest();
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} catch (e) {
|
||
// explicitly bubble up the exception if not found
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||
return new window.ActiveXObject('Microsoft.XMLHTTP');
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}
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};
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var request = getXHR();
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request.open('GET', url, false);
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request.send('');
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return request.responseText;
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||
} catch (e) {
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||
return '';
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||
}
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||
}
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||
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||
/**
|
||
* Retrieves source code from the source code cache.
|
||
* @param {string} url URL of source code.
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||
* @return {Array.<string>} Source contents.
|
||
*/
|
||
function getSource(url) {
|
||
if (!isString(url)) return [];
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||
if (!hasKey(sourceCache, url)) {
|
||
// URL needs to be able to fetched within the acceptable domain. Otherwise,
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// cross-domain errors will be triggered.
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var source = '';
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if (url.indexOf(document.domain) !== -1) {
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source = loadSource(url);
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}
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sourceCache[url] = source ? source.split('\n') : [];
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||
}
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||
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||
return sourceCache[url];
|
||
}
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||
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||
/**
|
||
* 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.
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||
* @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 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.<string>} Lines of source code.
|
||
*/
|
||
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.
|
||
*/
|
||
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.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 {?Object.<string, *>} Stack trace information.
|
||
*/
|
||
function computeStackTraceFromStackProp(ex) {
|
||
if (!ex.stack) {
|
||
return null;
|
||
}
|
||
|
||
var chrome = /^\s*at (.*?) ?\(?((?:file|https?|chrome-extension):.*?):(\d+)(?::(\d+))?\)?\s*$/i,
|
||
gecko = /^\s*(.*?)(?:\((.*?)\))?@((?:file|https?|chrome).*?):(\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] || UNKNOWN_FUNCTION,
|
||
'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] || UNKNOWN_FUNCTION,
|
||
'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.length) {
|
||
return null;
|
||
}
|
||
|
||
if (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 {
|
||
'name': ex.name,
|
||
'message': ex.message,
|
||
'url': document.location.href,
|
||
'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 {
|
||
'name': ex.name,
|
||
'message': ex.message,
|
||
'url': document.location.href,
|
||
'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|https?)\S+)(?:: in function (\S+))?\s*$/i,
|
||
lineRE2 = /^\s*Line (\d+) of inline#(\d+) script in ((?:file|https?)\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 (hasKey(scripts, 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 {
|
||
'name': ex.name,
|
||
'message': lines[0],
|
||
'url': document.location.href,
|
||
'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 = computeStackTraceByWalkingCallerChain.caller; curr && !recursion; curr = curr.caller) {
|
||
if (curr === computeStackTrace || curr === TraceKit.report) {
|
||
// console.log('skipping internal function');
|
||
continue;
|
||
}
|
||
|
||
item = {
|
||
'url': null,
|
||
'func': UNKNOWN_FUNCTION,
|
||
'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 === UNKNOWN_FUNCTION) {
|
||
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]) {
|
||
recursion = true;
|
||
}else{
|
||
funcs['' + curr] = true;
|
||
}
|
||
|
||
stack.push(item);
|
||
}
|
||
|
||
if (depth) {
|
||
// console.log('depth is ' + depth);
|
||
// console.log('stack is ' + stack.length);
|
||
stack.splice(0, depth);
|
||
}
|
||
|
||
var result = {
|
||
'name': ex.name,
|
||
'message': ex.message,
|
||
'url': document.location.href,
|
||
'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 == null ? 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 {};
|
||
}
|
||
|
||
computeStackTrace.augmentStackTraceWithInitialElement = augmentStackTraceWithInitialElement;
|
||
computeStackTrace.computeStackTraceFromStackProp = computeStackTraceFromStackProp;
|
||
computeStackTrace.guessFunctionName = guessFunctionName;
|
||
computeStackTrace.gatherContext = gatherContext;
|
||
|
||
return computeStackTrace;
|
||
}());
|