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function noop(){}
function chain(delegateFn, explicitDone){
var onDoneFn = noop;
var onErrorFn = noop;
var waitForCount = 1;
delegateFn = delegateFn || noop;
var stackError = new Error('capture stack');
function decrementWaitFor() {
waitForCount--;
if (waitForCount == 0)
onDoneFn();
}
function self(){
try {
return delegateFn.apply(self, arguments);
} catch (error) {
self.error(error);
} finally {
if (!explicitDone)
decrementWaitFor();
}
};
self.onDone = function(callback){
onDoneFn = callback;
return self;
};
self.onError = function(callback){
onErrorFn = callback;
return self;
};
self.waitFor = function(callback){
if (waitForCount == 0)
throw new Error("Can not wait on already called callback.");
waitForCount++;
return chain(callback).onDone(decrementWaitFor).onError(self.error);
};
self.waitMany = function(callback){
if (waitForCount == 0)
throw new Error("Can not wait on already called callback.");
waitForCount++;
return chain(callback, true).onDone(decrementWaitFor).onError(self.error);
};
self.done = function(callback){
decrementWaitFor();
};
self.error = function(error) {
var stack = stackError.stack.split(/\n\r?/).splice(2);
var nakedStack = [];
stack.forEach(function(frame){
if (!frame.match(/callback\.js:\d+:\d+\)$/))
nakedStack.push(frame);
});
error.stack = error.stack + '\nCalled from:\n' + nakedStack.join('\n');
onErrorFn(error);
};
return self;
}
exports.chain = chain;
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