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local getinfo = debug.getinfo
function core.global_exists(name)
if type(name) ~= "string" then
error("core.global_exists: " .. tostring(name) .. " is not a string")
end
return rawget(_G, name) ~= nil
end
local meta = {}
local declared = {}
-- Key is source file, line, and variable name; seperated by NULs
local warned = {}
function meta:__newindex(name, value)
local info = getinfo(2, "Sl")
local desc = ("%s:%d"):format(info.short_src, info.currentline)
if not declared[name] then
local warn_key = ("%s\0%d\0%s"):format(info.source,
info.currentline, name)
if not warned[warn_key] and info.what ~= "main" and
info.what ~= "C" then
core.log("warning", ("Assignment to undeclared "..
"global %q inside a function at %s.")
:format(name, desc))
warned[warn_key] = true
end
declared[name] = true
end
rawset(self, name, value)
end
function meta:__index(name)
local info = getinfo(2, "Sl")
local warn_key = ("%s\0%d\0%s"):format(info.source, info.currentline, name)
if not declared[name] and not warned[warn_key] and info.what ~= "C" then
core.log("warning", ("Undeclared global variable %q accessed at %s:%s")
:format(name, info.short_src, info.currentline))
warned[warn_key] = true
end
return rawget(self, name)
end
setmetatable(_G, meta)
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