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utils.js
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'use strict';
function bindArguments(args) {
for (var i = args.length - 1; i >= 0; i--) {
if (typeof args[i] === 'function') {
args[i] = global.zone.bind(args[i]);
}
}
return args;
};
function bindArgumentsOnce(args) {
for (var i = args.length - 1; i >= 0; i--) {
if (typeof args[i] === 'function') {
args[i] = global.zone.bindOnce(args[i]);
}
}
return args;
};
function patchPrototype(obj, fnNames) {
fnNames.forEach(function (name) {
var delegate = obj[name];
if (delegate) {
obj[name] = function () {
return delegate.apply(this, bindArguments(arguments));
};
}
});
};
function patchProperty(obj, prop) {
var desc = Object.getOwnPropertyDescriptor(obj, prop) || {
enumerable: true,
configurable: true
};
// A property descriptor cannot have getter/setter and be writable
// deleting the writable and value properties avoids this error:
//
// TypeError: property descriptors must not specify a value or be writable when a
// getter or setter has been specified
delete desc.writable;
delete desc.value;
// substr(2) cuz 'onclick' -> 'click', etc
var eventName = prop.substr(2);
var _prop = '_' + prop;
desc.set = function (fn) {
if (this[_prop]) {
this.removeEventListener(eventName, this[_prop]);
}
if (typeof fn === 'function') {
this[_prop] = fn;
this.addEventListener(eventName, fn, false);
} else {
this[_prop] = null;
}
};
desc.get = function () {
return this[_prop];
};
Object.defineProperty(obj, prop, desc);
};
function patchProperties(obj, properties) {
(properties || (function () {
var props = [];
for (var prop in obj) {
props.push(prop);
}
return props;
}()).
filter(function (propertyName) {
return propertyName.substr(0,2) === 'on';
})).
forEach(function (eventName) {
patchProperty(obj, eventName);
});
};
function patchEventTargetMethods(obj) {
var addDelegate = obj.addEventListener;
obj.addEventListener = function (eventName, fn) {
fn._bound = fn._bound || {};
arguments[1] = fn._bound[eventName] = zone.bind(fn);
return addDelegate.apply(this, arguments);
};
var removeDelegate = obj.removeEventListener;
obj.removeEventListener = function (eventName, fn) {
if(arguments[1]._bound && arguments[1]._bound[eventName]) {
var _bound = arguments[1]._bound;
arguments[1] = _bound[eventName];
delete _bound[eventName];
}
var result = removeDelegate.apply(this, arguments);
global.zone.dequeueTask(fn);
return result;
};
};
// wrap some native API on `window`
function patchClass(className) {
var OriginalClass = global[className];
if (!OriginalClass) return;
global[className] = function () {
var a = bindArguments(arguments);
switch (a.length) {
case 0: this._o = new OriginalClass(); break;
case 1: this._o = new OriginalClass(a[0]); break;
case 2: this._o = new OriginalClass(a[0], a[1]); break;
case 3: this._o = new OriginalClass(a[0], a[1], a[2]); break;
case 4: this._o = new OriginalClass(a[0], a[1], a[2], a[3]); break;
default: throw new Error('what are you even doing?');
}
};
var instance = new OriginalClass();
var prop;
for (prop in instance) {
(function (prop) {
if (typeof instance[prop] === 'function') {
global[className].prototype[prop] = function () {
return this._o[prop].apply(this._o, arguments);
};
} else {
Object.defineProperty(global[className].prototype, prop, {
set: function (fn) {
if (typeof fn === 'function') {
this._o[prop] = global.zone.bind(fn);
} else {
this._o[prop] = fn;
}
},
get: function () {
return this._o[prop];
}
});
}
}(prop));
};
};
module.exports = {
bindArguments: bindArguments,
bindArgumentsOnce: bindArgumentsOnce,
patchPrototype: patchPrototype,
patchProperty: patchProperty,
patchProperties: patchProperties,
patchEventTargetMethods: patchEventTargetMethods,
patchClass: patchClass
};