107 lines
3.0 KiB
Lua
107 lines
3.0 KiB
Lua
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local cron = {
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__VERSION = 'cron.lua 2.0.0',
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__DESCRIPTION = 'Time-related functions for lua',
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__URL = 'https://github.com/kikito/cron.lua',
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__LICENSE = [[
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Copyright (c) 2011 Enrique García Cota
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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]]
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}
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-- Private functions
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local function isCallable(callback)
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local tc = type(callback)
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if tc == 'function' then return true end
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if tc == 'table' then
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local mt = getmetatable(callback)
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return type(mt) == 'table' and type(mt.__call) == 'function'
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end
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return false
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end
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local function checkPositiveInteger(name, value)
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if type(value) ~= "number" or value < 0 then
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error(name .. " must be a positive number")
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end
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end
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local Clock = {}
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local Clock_mt = {__index = Clock}
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local function newClock(time, callback, update, ...)
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checkPositiveInteger('time', time)
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assert(isCallable(callback), "callback must be a function")
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return setmetatable({
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time = time,
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callback = callback,
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args = {...},
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running = 0,
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update = update
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}, Clock_mt)
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end
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local function updateAfterClock(self, dt) -- returns true if expired
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checkPositiveInteger('dt', dt)
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if self.running >= self.time then return true end
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self.running = self.running + dt
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if self.running >= self.time then
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self.callback(unpack(self.args))
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return true
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end
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return false
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end
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local function updateEveryClock(self, dt)
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checkPositiveInteger('dt', dt)
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self.running = self.running + dt
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while self.running >= self.time do
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self.callback(unpack(self.args))
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self.running = self.running - self.time
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end
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return false
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end
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function Clock:reset(running)
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running = running or 0
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checkPositiveInteger('running', running)
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self.running = running
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end
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function cron.after(time, callback, ...)
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return newClock(time, callback, updateAfterClock, ...)
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end
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function cron.every(time, callback, ...)
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return newClock(time, callback, updateEveryClock, ...)
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end
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return cron
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