no longer beta

1 files changed, 126 insertions, 0 deletions

diff --git a/script/without-check-nil.lua b/script/without-check-nil.lua
new file mode 100644
index 00000000..cc7da9d4
--- /dev/null
+++ b/script/without-check-nil.lua
@@ -0,0 +1,126 @@
+local m = {}
+
+local mt = {}
+mt.__add      = function (a, b)
+    if a == nil then a = 0 end
+    if b == nil then b = 0 end
+    return a + b
+end
+mt.__sub      = function (a, b)
+    if a == nil then a = 0 end
+    if b == nil then b = 0 end
+    return a - b
+end
+mt.__mul      = function (a, b)
+    if a == nil then a = 0 end
+    if b == nil then b = 0 end
+    return a * b
+end
+mt.__div      = function (a, b)
+    if a == nil then a = 0 end
+    if b == nil then b = 0 end
+    return a / b
+end
+mt.__mod      = function (a, b)
+    if a == nil then a = 0 end
+    if b == nil then b = 0 end
+    return a % b
+end
+mt.__pow      = function (a, b)
+    if a == nil then a = 0 end
+    if b == nil then b = 0 end
+    return a ^ b
+end
+mt.__unm      = function ()
+    return 0
+end
+mt.__concat   = function (a, b)
+    if a == nil then a = '' end
+    if b == nil then b = '' end
+    return a .. b
+end
+mt.__len      = function ()
+    return 0
+end
+mt.__lt       = function (a, b)
+    if a == nil then a = 0 end
+    if b == nil then b = 0 end
+    return a < b
+end
+mt.__le       = function (a, b)
+    if a == nil then a = 0 end
+    if b == nil then b = 0 end
+    return a <= b
+end
+mt.__index    = function () end
+mt.__newindex = function () end
+mt.__call     = function () end
+mt.__pairs    = function () end
+mt.__ipairs   = function () end
+if _VERSION == 'Lua 5.3' or _VERSION == 'Lua 5.4' then
+    mt.__idiv      = load[[
+        local a, b = ...
+        if a == nil then a = 0 end
+        if b == nil then b = 0 end
+        return a // b
+    ]]
+    mt.__band      = load[[
+        local a, b = ...
+        if a == nil then a = 0 end
+        if b == nil then b = 0 end
+        return a & b
+    ]]
+    mt.__bor       = load[[
+        local a, b = ...
+        if a == nil then a = 0 end
+        if b == nil then b = 0 end
+        return a | b
+    ]]
+    mt.__bxor      = load[[
+        local a, b = ...
+        if a == nil then a = 0 end
+        if b == nil then b = 0 end
+        return a ~ b
+    ]]
+    mt.__bnot      = load[[
+        return ~ 0
+    ]]
+    mt.__shl       = load[[
+        local a, b = ...
+        if a == nil then a = 0 end
+        if b == nil then b = 0 end
+        return a << b
+    ]]
+    mt.__shr       = load[[
+        local a, b = ...
+        if a == nil then a = 0 end
+        if b == nil then b = 0 end
+        return a >> b
+    ]]
+end
+
+for event, func in pairs(mt) do
+    mt[event] = function (...)
+        local watch = m.watch
+        if not watch then
+            return func(...)
+        end
+        local care, result = watch(event, ...)
+        if not care then
+            return func(...)
+        end
+        return result
+    end
+end
+
+function m.enable()
+    debug.setmetatable(nil, mt)
+end
+
+function m.disable()
+    if debug.getmetatable(nil) == mt then
+        debug.setmetatable(nil, nil)
+    end
+end
+
+return m