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'use strict';
/**
* inspired by Kris Kowal's Q (https://github.com/kriskowal/q)
*/
/**
* Constructs a promise manager.
*
* @param {function(function)=} nextTick Function for executing functions in the next turn. Falls
* back to `setTimeout` if undefined.
* @param {function(...*)=} exceptionHandler Function into which unexpected exceptions are passed for
* debugging purposes. Falls back to `console.error` if undefined,
* @returns {object} Promise manager.
*/
function qFactory(nextTick, exceptionHandler) {
nextTick = nextTick || function(callback) {
setTimeout(callback, 0); // very rare since most of queueing will be handled within $apply
};
exceptionHandler = exceptionHandler || function(e) {
// TODO(i): console.error is somehow reset to function(a) {}, it might be a JSTD bug
if (console && console.log) {
console.log(e);
}
}
var defer = function() {
var pending = [],
value, deferred;
deferred = {
resolve: function(val) {
if (pending) {
var callbacks = pending;
pending = undefined;
value = ref(val);
if (callbacks.length) {
nextTick(function() {
var callback;
for (var i = 0, ii = callbacks.length; i < ii; i++) {
callback = callbacks[i];
value.then(callback[0], callback[1]);
}
});
}
}
},
reject: function(reason) {
deferred.resolve(reject(reason));
},
promise: {
then: function(callback, errback) {
var result = defer();
var wrappedCallback = function(value) {
try {
result.resolve((callback || defaultCallback)(value));
} catch(e) {
exceptionHandler(e);
result.reject(e);
}
};
var wrappedErrback = function(reason) {
try {
result.resolve((errback || defaultErrback)(reason));
} catch(e) {
exceptionHandler(e);
result.reject(e);
}
};
if (pending) {
pending.push([wrappedCallback, wrappedErrback]);
} else {
value.then(wrappedCallback, wrappedErrback);
}
return result.promise;
}
}
};
return deferred;
};
var ref = function(value) {
if (value && value.then) return value;
return {
then: function(callback) {
var result = defer();
nextTick(function() {
result.resolve(callback(value));
});
return result.promise;
}
};
};
var reject = function(reason) {
return {
then: function(callback, errback) {
var result = defer();
nextTick(function() {
result.resolve(errback(reason));
});
return result.promise;
}
};
};
var when = function(value, callback, errback) {
var result = defer(),
done;
var wrappedCallback = function(value) {
try {
return (callback || defaultCallback)(value);
} catch (e) {
exceptionHandler(e);
return reject(e);
}
};
var wrappedErrback = function(reason) {
try {
return (errback || defaultErrback)(reason);
} catch (e) {
exceptionHandler(e);
return reject(e);
}
};
nextTick(function() {
ref(value).then(function(value) {
if (done) return;
done = true;
result.resolve(ref(value).then(wrappedCallback, wrappedErrback));
}, function(reason) {
if (done) return;
done = true;
result.resolve(wrappedErrback(reason));
});
});
return result.promise;
};
function defaultCallback(value) {
return value;
}
function defaultErrback(reason) {
return reject(reason);
}
function all(promises) {
var deferred = defer(),
counter = promises.length,
results = [];
forEach(promises, function(promise, index) {
promise.then(function(value) {
if (index in results) return;
results[index] = value;
if (!(--counter)) deferred.resolve(results);
}, function(reason) {
if (index in results) return;
deferred.reject(reason);
});
});
return deferred.promise;
}
return {
defer: defer,
reject: reject,
when: when,
all: all
};
}
// TODO(i): move elsewhere
function $QProvider() {
this.$get = ['$rootScope', '$exceptionHandler', function($rootScope, $exceptionHandler) {
return qFactory(function(callback) {
$rootScope.$evalAsync(callback);
}, $exceptionHandler);
}];
}
|
