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618183d065
Zev and I found this useful for debugging what's happening inside casperjs today. (imported from commit 6fb42165c4ff138ba3417ac2ee0db92040e49fa4)
73 lines
2.5 KiB
JavaScript
73 lines
2.5 KiB
JavaScript
/* WARNING:
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This file is only included when Django's DEBUG = True and your
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host is in INTERNAL_IPS.
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Do not commit any code elsewhere which uses these functions.
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They are for debugging use only.
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The file may still be accessible under other circumstances, so do
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not put sensitive information here. */
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// It's fine to use console.log etc. in this file.
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/*jslint devel: true */
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/*
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print_elapsed_time("foo", foo)
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evaluates to foo() and prints the elapsed time
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to the console along with the name "foo". */
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function print_elapsed_time(name, fun) {
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var t0 = new Date().getTime();
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var out = fun();
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var t1 = new Date().getTime();
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console.log(name + ': ' + (t1 - t0) + ' ms');
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return out;
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}
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// Javascript stack trac functionality, adapted from:
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// https://github.com/eriwen/javascript-stacktrace/blob/master/stacktrace.js
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// The first function is just a helper.
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function stringifyArguments(args) {
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var i, result = [];
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var slice = Array.prototype.slice;
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for (i = 0; i < args.length; ++i) {
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var arg = args[i];
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if (arg === undefined) {
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result[i] = 'undefined';
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} else if (arg === null) {
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result[i] = 'null';
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} else if (arg.constructor) {
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if (arg.constructor === Array) {
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if (arg.length < 3) {
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result[i] = '[' + stringifyArguments(arg) + ']';
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} else {
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result[i] = '[' + stringifyArguments(slice.call(arg, 0, 1)) + '...' + stringifyArguments(slice.call(arg, -1)) + ']';
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}
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} else if (arg.constructor === Object) {
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result[i] = '#object';
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} else if (arg.constructor === Function) {
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result[i] = '#function';
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} else if (arg.constructor === String) {
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result[i] = '"' + arg + '"';
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} else if (arg.constructor === Number) {
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result[i] = arg;
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}
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}
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}
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return result.join(',');
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}
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// Usage: console.log(verbose_stacktrace(arguments.callee));
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function verbose_stacktrace(curr) {
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var ANON = '{anonymous}', fnRE = /function\s*([\w\-$]+)?\s*\(/i, stack = [], fn, args, maxStackSize = 50;
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while (curr && curr['arguments'] && stack.length < maxStackSize) {
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fn = curr.toString();
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args = Array.prototype.slice.call(curr['arguments'] || []);
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stack[stack.length] = fn + '(' + stringifyArguments(args) + ')';
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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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