1--
2--  Copyright (C) 2015 - Garrett Regier
3--
4-- libpeas is free software; you can redistribute it and/or
5-- modify it under the terms of the GNU Lesser General Public
6-- License as published by the Free Software Foundation; either
7-- version 2.1 of the License, or (at your option) any later version.
8--
9-- libpeas is distributed in the hope that it will be useful,
10-- but WITHOUT ANY WARRANTY; without even the implied warranty of
11-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12-- Lesser General Public License for more details.
13--
14-- You should have received a copy of the GNU Lesser General Public
15-- License along with this library; if not, write to the Free Software
16-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
17--
18-- Modified version of: http://metalua.luaforge.net/src/lib/strict.lua.html
19
20__STRICT = true
21
22local mt = getmetatable(_G)
23if mt == nil then
24    mt = {}
25    setmetatable(_G, mt)
26end
27
28function mt:__newindex(name, value)
29    if __STRICT then
30        local what = debug.getinfo(2, 'S').what
31
32        if what ~= 'C' then
33            error("Attempted to create global variable '" ..
34                  tostring(name) .. "'", 2)
35        end
36    end
37
38    rawset(self, name, value)
39end
40
41function mt:__index(name)
42    if not __STRICT or debug.getinfo(2, 'S').what == 'C' then
43        return rawget(self, name)
44    end
45
46    error("Attempted to access nonexistent " ..
47          "global variable '" .. tostring(name) .. "'", 2)
48end
49
50-- ex:ts=4:et:
51