| // ========================================== |
| // Copyright 2013 Twitter, Inc |
| // Licensed under The MIT License |
| // http://opensource.org/licenses/MIT |
| // ========================================== |
| |
| "use strict"; |
| |
| define( |
| |
| [ |
| './utils', |
| './compose' |
| ], |
| |
| function (util, compose) { |
| |
| var advice = { |
| |
| around: function(base, wrapped) { |
| return function composedAround() { |
| // unpacking arguments by hand benchmarked faster |
| var i = 0, l = arguments.length, args = new Array(l + 1); |
| args[0] = base.bind(this); |
| for (; i < l; i++) args[i + 1] = arguments[i]; |
| |
| return wrapped.apply(this, args); |
| } |
| }, |
| |
| before: function(base, before) { |
| var beforeFn = (typeof before == 'function') ? before : before.obj[before.fnName]; |
| return function composedBefore() { |
| beforeFn.apply(this, arguments); |
| return base.apply(this, arguments); |
| } |
| }, |
| |
| after: function(base, after) { |
| var afterFn = (typeof after == 'function') ? after : after.obj[after.fnName]; |
| return function composedAfter() { |
| var res = (base.unbound || base).apply(this, arguments); |
| afterFn.apply(this, arguments); |
| return res; |
| } |
| }, |
| |
| // a mixin that allows other mixins to augment existing functions by adding additional |
| // code before, after or around. |
| withAdvice: function() { |
| ['before', 'after', 'around'].forEach(function(m) { |
| this[m] = function(method, fn) { |
| |
| compose.unlockProperty(this, method, function() { |
| if (typeof this[method] == 'function') { |
| return this[method] = advice[m](this[method], fn); |
| } else { |
| return this[method] = fn; |
| } |
| }); |
| |
| }; |
| }, this); |
| } |
| }; |
| |
| return advice; |
| } |
| ); |