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https://github.com/luanti-org/luanti.git
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58 lines
1.6 KiB
Lua
58 lines
1.6 KiB
Lua
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-- Always warn when creating a global variable, even outside of a function.
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-- This ignores mod namespaces (variables with the same name as the current mod).
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local WARN_INIT = false
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local getinfo = debug.getinfo
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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; seperated by NULs
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local warned = {}
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function meta:__newindex(name, value)
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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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if not declared[name] then
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local warn_key = ("%s\0%d\0%s"):format(info.source,
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info.currentline, name)
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if not warned[warn_key] and info.what ~= "main" and
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info.what ~= "C" then
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core.log("warning", ("Assignment to undeclared "..
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"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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-- Ignore mod namespaces
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if WARN_INIT and name ~= core.get_current_modname() then
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core.log("warning", ("Global variable %q created at %s.")
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:format(name, desc))
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end
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rawset(self, name, value)
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end
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function meta:__index(name)
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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 declared[name] and 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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return rawget(self, name)
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end
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setmetatable(_G, meta)
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