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48 lines
1.5 KiB
Lua
48 lines
1.5 KiB
Lua
local Observable = require "rx.observable"
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local Subscription = require "rx.subscription"
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local util = require "rx.util"
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--- Returns a new Observable that uses a callback to create Observables from the values produced by
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-- the source, then produces values from the most recent of these Observables.
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-- @arg {function=identity} callback - The function used to convert values to Observables.
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-- @returns {Observable}
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function Observable:flatMapLatest(callback)
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callback = callback or util.identity
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return Observable.create(function(observer)
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local innerSubscription
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local function onNext(...)
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observer:onNext(...)
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end
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local function onError(e)
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return observer:onError(e)
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end
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local function onCompleted()
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return observer:onCompleted()
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end
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local function subscribeInner(...)
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if innerSubscription then
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innerSubscription:unsubscribe()
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end
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return util.tryWithObserver(observer, function(...)
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innerSubscription = callback(...):subscribe(onNext, onError)
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end, ...)
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end
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local subscription = self:subscribe(subscribeInner, onError, onCompleted)
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return Subscription.create(function()
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if innerSubscription then
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innerSubscription:unsubscribe()
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end
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if subscription then
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subscription:unsubscribe()
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end
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end)
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end)
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end
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