samples/xglobals_test.mlua

-------------------------------------------------------------------------------
-- Copyright (c) 2006-2013 Fabien Fleutot and others.
--
-- All rights reserved.
--
-- This program and the accompanying materials are made available
-- under the terms of the Eclipse Public License v1.0 which
-- accompanies this distribution, and is available at
-- http://www.eclipse.org/legal/epl-v10.html
--
-- This program and the accompanying materials are also made available
-- under the terms of the MIT public license which accompanies this
-- distribution, and is available at http://www.lua.org/license.html
--
-- Contributors:
--     Fabien Fleutot - API and implementation
--
-------------------------------------------------------------------------------

-{ extension 'xglobal' }

----------------------------------------------------------------------
print "1) declare unassigned globals"
global a, b

----------------------------------------------------------------------
print "2) declare-and-assign global"
global c = 3

----------------------------------------------------------------------
print "3) assign to pre-declared globals"
a, b = 1, 2

----------------------------------------------------------------------
print "4) fail when setting an undeclared global"
local st1, msg1 = pcall(function()
   a = 4
   d = 5 -- failure, assignment to undeclared global
end)
assert(not st1)
printf ("   -> This error was expected: %s", msg1)

----------------------------------------------------------------------
print "5) fail when reading an undeclared global"
local st2, msg2 = pcall(function()
   b = c -- OK
   local _ = d -- failure, try to read undeclared global
end)
assert(not st2)
printf ("   -> This error was expected: %s", msg2)

----------------------------------------------------------------------
print "6) check the globals' values"
assert(a==4)
assert(b==3)
assert(c==3)

----------------------------------------------------------------------
print "*) done."