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43 lines
1.2 KiB
Lua
43 lines
1.2 KiB
Lua
local Observable = require "rx.observable"
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local util = require "rx.util"
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--- Returns a new Observable that produces elements until the predicate returns falsy.
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-- @arg {function} predicate - The predicate used to continue production of values.
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-- @returns {Observable}
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function Observable:takeWhile(predicate)
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predicate = predicate or util.identity
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return Observable.create(function(observer)
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local taking = true
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local subscription
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local function onNext(...)
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if taking then
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util.tryWithObserver(observer, function(...)
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taking = predicate(...)
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end, ...)
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if taking then
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return observer:onNext(...)
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else
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if subscription then
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subscription:unsubscribe()
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end
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return observer:onCompleted()
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end
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end
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end
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local function onError(message)
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return observer:onError(message)
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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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subscription = self:subscribe(onNext, onError, onCompleted)
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return subscription
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end)
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end
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