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36 lines
1.0 KiB
Lua
36 lines
1.0 KiB
Lua
local Observable = require "rx.observable"
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local util = require "rx.util"
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--- Returns an Observable that produces a sliding window of the values produced by the original.
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-- @arg {number} size - The size of the window. The returned observable will produce this number
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-- of the most recent values as multiple arguments to onNext.
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-- @returns {Observable}
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function Observable:window(size)
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if not size or type(size) ~= "number" then
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error("Expected a number")
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end
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return Observable.create(function(observer)
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local window = {}
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local function onNext(value)
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table.insert(window, value)
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if #window >= size then
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observer:onNext(util.unpack(window))
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table.remove(window, 1)
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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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return self:subscribe(onNext, onError, onCompleted)
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end)
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end
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