58 lines
2.6 KiB
JavaScript
58 lines
2.6 KiB
JavaScript
/**
|
|
* Reports the use of functions known to be serious performance bottlenecks in JS
|
|
*
|
|
* @see http://www.nczonline.net/blog/2013/06/25/eval-isnt-evil-just-misunderstood/
|
|
* @see http://www.quirksmode.org/blog/archives/2005/06/three_javascrip_1.html
|
|
* @see http://www.stevesouders.com/blog/2012/04/10/dont-docwrite-scripts/
|
|
*/
|
|
/* global document: true, window: true */
|
|
|
|
exports.version = '0.1';
|
|
|
|
exports.module = function(phantomas) {
|
|
'use strict';
|
|
|
|
phantomas.setMetric('documentWriteCalls'); //@desc number of calls to either document.write or document.writeln
|
|
phantomas.setMetric('evalCalls'); // @desc number of calls to eval (either direct or via setTimeout / setInterval)
|
|
|
|
phantomas.once('init', function() {
|
|
phantomas.evaluate(function() {
|
|
(function(phantomas) {
|
|
function report(msg, caller, backtrace, metric) {
|
|
phantomas.log(msg + ': from ' + caller + '!');
|
|
phantomas.log('Backtrace: ' + backtrace);
|
|
phantomas.incrMetric(metric);
|
|
}
|
|
|
|
// spy calls to eval()
|
|
phantomas.spy(window, 'eval', function(code) {
|
|
report('eval() called directly', phantomas.getCaller(), phantomas.getBacktrace(), 'evalCalls');
|
|
phantomas.log('eval\'ed code: ' + (code || '').substring(0, 150) + '(...)');
|
|
});
|
|
|
|
// spy calls to setTimeout / setInterval with string passed instead of a function
|
|
phantomas.spy(window, 'setTimeout', function(fn, interval) {
|
|
if (typeof fn !== 'string') return;
|
|
|
|
report('eval() called via setTimeout("' + fn + '")', phantomas.getCaller(), phantomas.getBacktrace(), 'evalCalls');
|
|
});
|
|
|
|
phantomas.spy(window, 'setInterval', function(fn, interval) {
|
|
if (typeof fn !== 'string') return;
|
|
|
|
report('eval() called via setInterval("' + fn + '")', phantomas.getCaller(), phantomas.getBacktrace(), 'evalCalls');
|
|
});
|
|
|
|
// spy document.write(ln)
|
|
phantomas.spy(document, 'write', function(arg) {
|
|
report('document.write() used', phantomas.getCaller(), phantomas.getBacktrace(), 'documentWriteCalls');
|
|
});
|
|
|
|
phantomas.spy(document, 'writeln', function(arg) {
|
|
report('document.writeln() used', phantomas.getCaller(), phantomas.getBacktrace(), 'documentWriteCalls');
|
|
});
|
|
})(window.__phantomas);
|
|
});
|
|
});
|
|
};
|