Getting a JavaScript stracktrace in any browser
Written by on August 18th, 2008 in Uncategorized.
Eric Wendelin has posted on getting a JavaScript stack trace no matter that the browser.
With Firebug you can call console.trace() but what about the rest?
Luke Smith took Eric’s work and added to it, ending up with:
JAVASCRIPT:
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(function () {
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YOUR_NAMESPACE.getStackTrace = (function () {
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var mode;
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try {(0)()} catch (e) {
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mode = e.stack ? ‘Firefox’ : window.opera ? ‘Opera’ : ‘Other’;
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}
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switch (mode) {
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case ‘Firefox’ : return function () {
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try {(0)()} catch (e) {
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return e.stack.replace(/^.*?\n/,”).
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replace(/(?:\n@:0)?\s+$/m,”).
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replace(/^\(/gm,‘{anonymous}(’).
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split(“\n“);
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}
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};
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case ‘Opera’ : return function () {
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try {(0)()} catch (e) {
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var lines = e.message.split(“\n“),
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ANON = ‘{anonymous}’,
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lineRE = /Line\s+(\d+).*?in\s+(http\S+)(?:.*?in\s+function\s+(\S+))?/i,
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i,j,len;
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for (i=4,j=0,len=lines.length; i<len; i+=2) {
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if (lineRE.test(lines[i])) {
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lines[j++] = (RegExp.$3 ?
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RegExp.$3 + ‘()@’ + RegExp.$2 + RegExp.$1 :
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ANON + RegExp.$2 + ‘:’ + RegExp.$1) +
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‘ — ‘ + lines[i+1].replace(/^\s+/,”);
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}
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}
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lines.splice(j,lines.length-j);
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return lines;
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}
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};
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default : return function () {
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var curr = arguments.callee.caller,
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FUNC = ‘function’, ANON = “{anonymous}”,
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fnRE = /function\s*([\w\-$]+)?\s*\(/i,
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stack = [],j=0,
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fn,args,i;
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while (curr) {
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fn = fnRE.test(curr.toString()) ? RegExp.$1 || ANON : ANON;
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args = stack.slice.call(curr.arguments);
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i = args.length;
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while (i–) {
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switch (typeof args[i]) {
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case ’string’ : args[i] = ‘"’+args[i].replace(/“/g,’\\“‘)+’“‘; break;
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case ‘function’: args[i] = FUNC; break;
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}
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}
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stack[j++] = fn + ‘(’ + args.join() + ‘)’;
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curr = curr.caller;
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}
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return stack;
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};
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}
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})();
Source: Ajaxian » Front Page
Original Article: http://feeds.feedburner.com/~r/ajaxian/~3/367995726/getting-a-javascript-stracktrace-in-any-browser