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51 lines
1.5 KiB
Lua
51 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 an Observable that produces values from the original along with the most recently
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-- produced value from all other specified Observables. Note that only the first argument from each
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-- source Observable is used.
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-- @arg {Observable...} sources - The Observables to include the most recent values from.
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-- @returns {Observable}
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function Observable:with(...)
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local sources = {...}
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return Observable.create(function(observer)
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local latest = setmetatable({}, {
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__len = util.constant(#sources),
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})
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local subscriptions = {}
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local function setLatest(i)
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return function(value)
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latest[i] = value
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end
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end
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local function onNext(value)
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return observer:onNext(value, util.unpack(latest))
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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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for i = 1, #sources do
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subscriptions[i] = sources[i]:subscribe(setLatest(i), util.noop, util.noop)
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end
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subscriptions[#sources + 1] = self:subscribe(onNext, onError, onCompleted)
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return Subscription.create(function()
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for i = 1, #sources + 1 do
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if subscriptions[i] then
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subscriptions[i]: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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end
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