Current File : //proc/self/root/data/old/home/stash/atlassian-stash/static/util/feature-detect.js
define('util/feature-detect', [
'underscore',
'exports'
], function(
_,
exports
) {
"use strict";
var vendors = ['ms', 'moz', 'webkit', 'o'];
function prefixed(prop) {
var capped = prop.charAt(0).toUpperCase() + prop.substring(1);
return [prop].concat(_.map(vendors, function(prefix) {
return prefix + capped;
}));
}
/**
* Does this browser support localStorage?
* @function
*/
var supportsLocalStorage = _.once(function () {
try {
window.localStorage.setItem('___stash_test', 'true');
window.localStorage.removeItem('___stash_test');
return true;
} catch(e) {
console && console.log('Note: localStorage not supported in this browser.');
return false;
}
});
/**
* Does this browser support canvas?
* @function
*/
var supportsCanvas = _.once(function() {
var canvas = document.createElement('canvas');
return (typeof canvas.getContext === 'function') && !!canvas.getContext('2d');
});
/**
* Does this browser support the FileReader API?
* @function
*/
var supportsFileReader = _.once(function() {
return !!(window.File && window.FileList && window.FileReader);
});
/**
* Does this browser return captured groups when calling String.prototype.split with a RegExp.
* @function
*/
var supportsSplitCapture = _.once(function() {
return "a1a".split(/(\d)/).length === 3; //Non-supporting browsers will have length === 2
});
/**
* Does this browser support css transforms?
* @function
*/
var supportsTransforms = _.once(function() {
return _.find(prefixed('transform'), function (prop) {
return document.body.style[prop] !== undefined;
});
});
/**
* Does this browser support modifying an element's classes via classList?
* @function
*/
var supportsClasslist = _.once(function(){
return 'classList' in document.documentElement;
});
/**
* Tests whose outcome will be used by CSS not JS, so the result will be reflected in classes on the html element.
* Should be defined in the form {className: function test(){}}
*/
var cssTests = {
'pointer-events': function(){
var element = document.createElement('x');
element.style.cssText = 'pointer-events:auto';
return element.style.pointerEvents === 'auto';
}
};
/**
* Iterate through all the cssTests and add classes to the html element for any that pass
*/
(function runCssTests(tests){
var docEl = document.documentElement;
_.forEach(tests, function(test, className){
//I'm loathe to add a jQuery dependency just for adding a class. ClassList supported in IE10+
test() && (supportsClasslist() ? docEl.classList.add(className) : docEl.className += ' ' + className);
});
})(cssTests);
exports.localStorage = supportsLocalStorage;
exports.canvas = supportsCanvas;
exports.fileReader = supportsFileReader;
exports.splitCapture = supportsSplitCapture;
exports.cssTransform = supportsTransforms;
});
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