Software: Apache. PHP/5.5.15 uname -a: Windows NT SVR-DMZ 6.1 build 7600 (Windows Server 2008 R2 Enterprise Edition) i586 SYSTEM Safe-mode: OFF (not secure) C:\phpMyAdmin1\js\tracekit\ drwxrwxrwx | |
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TraceKit - Cross brower stack traces - github.com/occ/TraceKit
MIT license
*/
;(function(window, undefined) {
var TraceKit = {};
var _oldTraceKit = window.TraceKit;
// global reference to slice
var _slice = [].slice;
var UNKNOWN_FUNCTION = '?';
/**
* _has, a better form of hasOwnProperty
* Example: _has(MainHostObject, property) === true/false
*
* @param {Object} host object to check property
* @param {string} key to check
*/
function _has(object, key) {
return Object.prototype.hasOwnProperty.call(object, key);
}
function _isUndefined(what) {
return typeof what === 'undefined';
}
/**
* TraceKit.noConflict: Export TraceKit out to another variable
* Example: var TK = TraceKit.noConflict()
*/
TraceKit.noConflict = function noConflict() {
window.TraceKit = _oldTraceKit;
return TraceKit;
};
/**
* TraceKit.wrap: Wrap any function in a TraceKit reporter
* Example: func = TraceKit.wrap(func);
*
* @param {Function} func Function to be wrapped
* @return {Function} The wrapped func
*/
TraceKit.wrap = function traceKitWrapper(func) {
function wrapped() {
try {
return func.apply(this, arguments);
} catch (e) {
TraceKit.report(e);
throw e;
}
}
return wrapped;
};
/**
* TraceKit.report: cross-browser processing of unhandled exceptions
*
* Syntax:
* TraceKit.report.subscribe(function(stackInfo) { ... })
* TraceKit.report.unsubscribe(function(stackInfo) { ... })
* TraceKit.report(exception)
* try { ...code... } catch(ex) { TraceKit.report(ex); }
*
* Supports:
* - Firefox: full stack trace with line numbers, plus column number
* on top frame; column number is not guaranteed
* - Opera: full stack trace with line and column numbers
* - Chrome: full stack trace with line and column numbers
* - Safari: line and column number for the top frame only; some frames
* may be missing, and column number is not guaranteed
* - IE: line and column number for the top frame only; some frames
* may be missing, and column number is not guaranteed
*
* In theory, TraceKit should work on all of the following versions:
* - IE5.5+ (only 8.0 tested)
* - Firefox 0.9+ (only 3.5+ tested)
* - Opera 7+ (only 10.50 tested; versions 9 and earlier may require
* Exceptions Have Stacktrace to be enabled in opera:config)
* - Safari 3+ (only 4+ tested)
* - Chrome 1+ (only 5+ tested)
* - Konqueror 3.5+ (untested)
*
* Requires TraceKit.computeStackTrace.
*
* Tries to catch all unhandled exceptions and report them to the
* subscribed handlers. Please note that TraceKit.report will rethrow the
* exception. This is REQUIRED in order to get a useful stack trace in IE.
* If the exception does not reach the top of the browser, you will only
* get a stack trace from the point where TraceKit.report was called.
*
* Handlers receive a stackInfo object as described in the
* TraceKit.computeStackTrace docs.
*/
TraceKit.report = (function reportModuleWrapper() {
var handlers = [],
lastException = null,
lastExceptionStack = null;
/**
* Add a crash handler.
* @param {Function} handler
*/
function subscribe(handler) {
installGlobalHandler();
handlers.push(handler);
}
/**
* Remove a crash handler.
* @param {Function} handler
*/
function unsubscribe(handler) {
for (var i = handlers.length - 1; i >= 0; --i) {
if (handlers[i] === handler) {
handlers.splice(i, 1);
}
}
}
/**
* Dispatch stack information to all handlers.
* @param {Object.<string, *>} stack
*/
function notifyHandlers(stack, windowError) {
var exception = null;
if (windowError && !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.
*/
function traceKitWindowOnError(message, url, lineNo) {
var stack = null;
if (lastExceptionStack) {
TraceKit.computeStackTrace.augmentStackTraceWithInitialElement(lastExceptionStack, url, lineNo, message);
stack = lastExceptionStack;
lastExceptionStack = null;
lastException = null;
} else {
var location = {
'url': url,
'line': lineNo
};
location.func = TraceKit.computeStackTrace.guessFunctionName(location.url, location.line);
location.context = TraceKit.computeStackTrace.gatherContext(location.url, location.line);
stack = {
'mode': 'onerror',
'message': message,
'url': document.location.href,
'stack': [location],
'useragent': navigator.userAgent
};
}
notifyHandlers(stack, 'from window.onerror');
if (_oldOnerrorHandler) {
return _oldOnerrorHandler.apply(this, arguments);
}
return false;
}
function installGlobalHandler ()
{
if (_onErrorHandlerInstalled === true) {
return;
}
_oldOnerrorHandler = window.onerror;
window.onerror = traceKitWindowOnError;
_onErrorHandlerInstalled = true;
}
/**
* Reports an unhandled Error to TraceKit.
* @param {Error} ex
*/
function report(ex) {
var args = _slice.call(arguments, 1);
if (lastExceptionStack) {
if (lastException === ex) {
return; // already caught by an inner catch block, ignore
} else {
var s = lastExceptionStack;
lastExceptionStack = null;
lastException = null;
notifyHandlers.apply(null, [s, null].concat(args));
}
}
var stack = TraceKit.computeStackTrace(ex);
lastExceptionStack = stack;
lastException = ex;
// If the stack trace is incomplete, wait for 2 seconds for
// slow slow IE to see if onerror occurs or not before reporting
// this exception; otherwise, we will end up with an incomplete
// stack trace
window.setTimeout(function () {
if (lastException === ex) {
lastExceptionStack = null;
lastException = null;
notifyHandlers.apply(null, [stack, null].concat(args));
}
}, (stack.incomplete ? 2000 : 0));
throw ex; // re-throw to propagate to the top level (and cause window.onerror)
}
report.subscribe = subscribe;
report.unsubscribe = unsubscribe;
return report;
}());
/**
* TraceKit.computeStackTrace: cross-browser stack traces in JavaScript
*
* Syntax:
* s = TraceKit.computeStackTrace.ofCaller([depth])
* s = TraceKit.computeStackTrace(exception) // consider using TraceKit.report instead (see below)
* Returns:
* s.name - exception name
* s.message - exception message
* s.stack[i].url - JavaScript or HTML file URL
* s.stack[i].func - function name, or empty for anonymous functions (if guessing did not work)
* s.stack[i].args - arguments passed to the function, if known
* s.stack[i].line - line number, if known
* s.stack[i].column - column number, if known
* s.stack[i].context - an array of source code lines; the middle element corresponds to the correct line#
* s.mode - 'stack', 'stacktrace', 'multiline', 'callers', 'onerror', or 'failed' -- method used to collect the stack trace
*
* Supports:
* - Firefox: full stack trace with line numbers and unreliable column
* number on top frame
* - Opera 10: full stack trace with line and column numbers
* - Opera 9-: full stack trace with line numbers
* - Chrome: full stack trace with line and column numbers
* - Safari: line and column number for the topmost stacktrace element
* only
* - IE: no line numbers whatsoever
*
* Tries to guess names of anonymous functions by looking for assignments
* in the source code. In IE and Safari, we have to guess source file names
* by searching for function bodies inside all page scripts. This will not
* work for scripts that are loaded cross-domain.
* Here be dragons: some function names may be guessed incorrectly, and
* duplicate functions may be mismatched.
*
* TraceKit.computeStackTrace should only be used for tracing purposes.
* Logging of unhandled exceptions should be done with TraceKit.report,
* which builds on top of TraceKit.computeStackTrace and provides better
* IE support by utilizing the window.onerror event to retrieve information
* about the top of the stack.
*
* Note: In IE and Safari, no stack trace is recorded on the Error object,
* so computeStackTrace instead walks its *own* chain of callers.
* This means that:
* * in Safari, some methods may be missing from the stack trace;
* * in IE, the topmost function in the stack trace will always be the
* caller of computeStackTrace.
*
* This is okay for tracing (because you are likely to be calling
* computeStackTrace from the function you want to be the topmost element
* of the stack trace anyway), but not okay for logging unhandled
* exceptions (because your catch block will likely be far away from the
* inner function that actually caused the exception).
*
* Tracing example:
* function trace(message) {
* var stackInfo = TraceKit.computeStackTrace.ofCaller();
* var data = message + "\n";
* for(var i in stackInfo.stack) {
* var item = stackInfo.stack[i];
* data += (item.func || '[anonymous]') + "() in " + item.url + ":" + (item.line || '0') + "\n";
* }
* if (window.console)
* console.info(data);
* else
* alert(data);
* }
*/
TraceKit.computeStackTrace = (function 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.
*/
function loadSource(url) {
if (!TraceKit.remoteFetching) { //Only attempt request if remoteFetching is on.
return '';
}
try {
function getXHR() {
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.
*/
function getSource(url) {
if (!_has(sourceCache, url)) {
// URL needs to be able to fetched within the acceptable domain. Otherwise,
// cross-domain errors will be triggered.
var source = '';
if (url.indexOf(document.domain) !== -1) {
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.
*/
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.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 (?:((?:\[object object\])?\S+(?: \[as \S+\])?) )?\(?((?:file|http|https):.*?):(\d+)(?::(\d+))?\)?\s*$/i,
gecko = /^\s*(\S*)(?:\((.*?)\))?@((?:file|http|https).*?):(\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[0] && stack[0].line && !stack[0].column && reference) {
stack[0].column = findSourceInLine(reference[1], stack[0].url, stack[0].line);
}
if (!stack.length) {
return null;
}
return {
'mode': 'stack',
'name': ex.name,
'message': ex.message,
'url': document.location.href,
'stack': stack,
'useragent': navigator.userAgent
};
}
/**
* Computes stack trace information from the stacktrace property.
* Opera 10 uses this property.
* @param {Error} ex
* @return {?Object.<string, *>} Stack trace information.
*/
function computeStackTraceFromStacktraceProp(ex) {
// Access and store the stacktrace property before doing ANYTHING
// else to it because Opera is not very good at providing it
// reliably in other circumstances.
var stacktrace = ex.stacktrace;
var testRE = / line (\d+), column (\d+) in (?:<anonymous function: ([^>]+)>|([^\)]+))\((.*)\) in (.*):\s*$/i,
lines = stacktrace.split('\n'),
stack = [],
parts;
for (var i = 0, j = lines.length; i < j; i += 2) {
if ((parts = testRE.exec(lines[i]))) {
var element = {
'line': +parts[1],
'column': +parts[2],
'func': parts[3] || parts[4],
'args': parts[5] ? parts[5].split(',') : [],
'url': parts[6]
};
if (!element.func && element.line) {
element.func = guessFunctionName(element.url, element.line);
}
if (element.line) {
try {
element.context = gatherContext(element.url, element.line);
} catch (exc) {}
}
if (!element.context) {
element.context = [lines[i + 1]];
}
stack.push(element);
}
}
if (!stack.length) {
return null;
}
return {
'mode': 'stacktrace',
'name': ex.name,
'message': ex.message,
'url': document.location.href,
'stack': stack,
'useragent': navigator.userAgent
};
}
/**
* NOT TESTED.
* Computes stack trace information from an error message that includes
* the stack trace.
* Opera 9 and earlier use this method if the option to show stack
* traces is turned on in opera:config.
* @param {Error} ex
* @return {?Object.<string, *>} Stack information.
*/
function computeStackTraceFromOperaMultiLineMessage(ex) {
// Opera includes a stack trace into the exception message. An example is:
//
// Statement on line 3: Undefined variable: undefinedFunc
// Backtrace:
// Line 3 of linked script file://localhost/Users/andreyvit/Projects/TraceKit/javascript-client/sample.js: In function zzz
// undefinedFunc(a);
// Line 7 of inline#1 script in file://localhost/Users/andreyvit/Projects/TraceKit/javascript-client/sample.html: In function yyy
// zzz(x, y, z);
// Line 3 of inline#1 script in file://localhost/Users/andreyvit/Projects/TraceKit/javascript-client/sample.html: In function xxx
// yyy(a, a, a);
// Line 1 of function script
// try { xxx('hi'); return false; } catch(ex) { TraceKit.report(ex); }
// ...
var lines = ex.message.split('\n');
if (lines.length < 4) {
return null;
}
var lineRE1 = /^\s*Line (\d+) of linked script ((?:file|http|https)\S+)(?:: in function (\S+))?\s*$/i,
lineRE2 = /^\s*Line (\d+) of inline#(\d+) script in ((?:file|http|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 (_has(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 {
'mode': 'multiline',
'name': ex.name,
'message': lines[0],
'url': document.location.href,
'stack': stack,
'useragent': navigator.userAgent
};
}
/**
* 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 = {
'mode': 'callers',
'name': ex.name,
'message': ex.message,
'url': document.location.href,
'stack': stack,
'useragent': navigator.userAgent
};
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 {
'mode': 'failed'
};
}
/**
* Logs a stacktrace starting from the previous call and working down.
* @param {(number|string)=} depth How many frames deep to trace.
* @return {Object.<string, *>} Stack trace information.
*/
function computeStackTraceOfCaller(depth) {
depth = (depth == null ? 0 : +depth) + 1; // "+ 1" because "ofCaller" should drop one frame
try {
throw new Error();
} catch (ex) {
return computeStackTrace(ex, depth + 1);
}
return null;
}
computeStackTrace.augmentStackTraceWithInitialElement = augmentStackTraceWithInitialElement;
computeStackTrace.guessFunctionName = guessFunctionName;
computeStackTrace.gatherContext = gatherContext;
computeStackTrace.ofCaller = computeStackTraceOfCaller;
return computeStackTrace;
}());
/**
* Extends support for global error handling for asynchronous browser
* functions. Adopted from Closure Library's errorhandler.js
*/
(function extendToAsynchronousCallbacks() {
var _helper = function _helper(fnName) {
var originalFn = window[fnName];
window[fnName] = function traceKitAsyncExtension() {
// Make a copy of the arguments
var args = _slice.call(arguments);
var originalCallback = args[0];
if (typeof (originalCallback) === 'function') {
args[0] = TraceKit.wrap(originalCallback);
}
// IE < 9 doesn't support .call/.apply on setInterval/setTimeout, but it
// also only supports 2 argument and doesn't care what "this" is, so we
// can just call the original function directly.
if (originalFn.apply) {
return originalFn.apply(this, args);
} else {
return originalFn(args[0], args[1]);
}
};
};
_helper('setTimeout');
_helper('setInterval');
}());
//Default options:
if (!TraceKit.remoteFetching) {
TraceKit.remoteFetching = true;
}
if (!TraceKit.collectWindowErrors) {
TraceKit.collectWindowErrors = true;
}
if (!TraceKit.linesOfContext || TraceKit.linesOfContext < 1) {
// 5 lines before, the offending line, 5 lines after
TraceKit.linesOfContext = 11;
}
// Export to global object
window.TraceKit = TraceKit;
}(window));
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