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var defer = function () { | |
var value, | |
resolution, | |
handlers = {}; | |
var fulfill = function () { | |
if (resolution) { | |
var handler = handlers[resolution]; | |
if (handler) { | |
handler(); | |
} | |
} | |
}; | |
var wrap = function (c, d) { | |
return function () { | |
c = c || function () {}; | |
if (resolution === 'rejected') { | |
c(value); | |
return d.reject(value); | |
} | |
var next; | |
try { | |
next = c(value); | |
} | |
catch (e) { | |
return d.reject(e); | |
} | |
if (next) { | |
if (next.then) { | |
return next.then(function (resp) { | |
return d.resolve(resp); | |
}, function (err) { | |
return d.reject(err); | |
}); | |
} | |
} | |
return d.resolve(next); | |
}; | |
}; | |
var resolve = function (v) { | |
value = v; | |
resolution = 'resolved'; | |
fulfill(); | |
return this; | |
}; | |
var reject = function (v) { | |
value = v; | |
resolution = 'rejected'; | |
fulfill(); | |
return this; | |
}; | |
var then = function (done, fail) { | |
var deferred = defer(); | |
handlers.resolved = wrap(done, deferred); | |
handlers.rejected = wrap(fail, deferred); | |
fulfill(); | |
return deferred.promise; | |
}; | |
var promise = { | |
then: then | |
}; | |
return { | |
promise: promise, | |
then: then, | |
resolve: resolve, | |
reject: reject | |
}; | |
}; |
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nice :)