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authorchai <chaifix@163.com>2021-11-15 11:54:17 +0800
committerchai <chaifix@163.com>2021-11-15 11:54:17 +0800
commit30f2f46474bf4eda5f10d4c64a07cde01d469f66 (patch)
tree6ff2ed3262037b3c9bae2d2b9059a1d65773f31c /Data/BuiltIn/Libraries/strict.lua
parent4c36bed53fe63ae6056730b3ecad2573f03d88f8 (diff)
*rename DefaultContent -> BuiltIn
Diffstat (limited to 'Data/BuiltIn/Libraries/strict.lua')
-rw-r--r--Data/BuiltIn/Libraries/strict.lua30
1 files changed, 30 insertions, 0 deletions
diff --git a/Data/BuiltIn/Libraries/strict.lua b/Data/BuiltIn/Libraries/strict.lua
new file mode 100644
index 0000000..6f67fc0
--- /dev/null
+++ b/Data/BuiltIn/Libraries/strict.lua
@@ -0,0 +1,30 @@
+local mt = getmetatable(_G)
+if mt == nil then
+ mt = {}
+ setmetatable(_G, mt)
+end
+
+__STRICT = true
+mt.__declared = {}
+
+mt.__newindex = function (t, n, v)
+ if __STRICT and not mt.__declared[n] then
+ local w = debug.getinfo(2, "S").what
+ if w ~= "main" and w ~= "C" then
+ error("assign to undeclared variable '"..n.."'", 2)
+ end
+ mt.__declared[n] = true
+ end
+ rawset(t, n, v)
+end
+
+mt.__index = function (t, n)
+ if not mt.__declared[n] and debug.getinfo(2, "S").what ~= "C" then
+ error("variable '"..n.."' is not declared", 2)
+ end
+ return rawget(t, n)
+end
+
+function global(...)
+ for _, v in ipairs{...} do mt.__declared[v] = true end
+end \ No newline at end of file