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|
--------------------------------------------------------------------------
-- These functions allow us to define or check a global variable
-- inside a function.
-- @module declare
------------------------------------------------------------------------
--
-- Copyright (C) 2008-2018 Robert McLay
--
-- Permission is hereby granted, free of charge, to any person obtaining
-- a copy of this software and associated documentation files (the
-- "Software"), to deal in the Software without restriction, including
-- without limitation the rights to use, copy, modify, merge, publish,
-- distribute, sublicense, and/or sell copies of the Software, and to
-- permit persons to whom the Software is furnished to do so, subject
-- to the following conditions:
--
-- The above copyright notice and this permission notice shall be
-- included in all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
-- OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
-- BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-- ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-- CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-- THE SOFTWARE.
--
--------------------------------------------------------------------------
--------------------------------------------------------------------------
-- Declares a string whos value becomes a global variable.
-- @param name A string
-- @param initval initial value
function declare(name, initval)
rawset(_G, name, initval or false)
end
--------------------------------------------------------------------------
-- Is the value of the string a global variable.
-- @param name A string.
function isDefined(name)
return (rawget(_G, name) ~= nil)
end
function isNotDefined(name)
return (rawget(_G, name) == nil)
end
|
