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