Last change
on this file since 10181 was
6774,
checked in by rgrieder, 15 years ago
|
Activated Strict.lua
That means you can no longer assign to or access an undeclared global variable on function scope.
Declaring: either assign anything to the variable (including nil) on file scope
or use the function global("myVar", "myVar2", …, "myVarN") (mind the strings!)
|
-
Property svn:eol-style set to
native
|
File size:
1.1 KB
|
Rev | Line | |
---|
[6663] | 1 | -- |
---|
| 2 | -- strict.lua |
---|
| 3 | -- checks uses of undeclared global variables |
---|
| 4 | -- All global variables must be 'declared' through a regular assignment |
---|
| 5 | -- (even assigning nil will do) in a main chunk before being used |
---|
| 6 | -- anywhere or assigned to inside a function. |
---|
| 7 | -- |
---|
| 8 | |
---|
| 9 | local mt = getmetatable(_G) |
---|
| 10 | if mt == nil then |
---|
| 11 | mt = {} |
---|
| 12 | setmetatable(_G, mt) |
---|
| 13 | end |
---|
| 14 | |
---|
[6774] | 15 | __STRICT = true |
---|
[6663] | 16 | mt.__declared = {} |
---|
| 17 | |
---|
| 18 | mt.__newindex = function (t, n, v) |
---|
[6774] | 19 | if not mt.__declared[n] then |
---|
| 20 | if __STRICT then |
---|
| 21 | local d = debug.getinfo(2, "S") |
---|
| 22 | local w = d and d.what or "C" |
---|
| 23 | if w ~= "main" and w ~= "C" then |
---|
| 24 | error("Assigning to undeclared global variable '"..n.."'", 2) |
---|
| 25 | end |
---|
[6663] | 26 | end |
---|
| 27 | mt.__declared[n] = true |
---|
| 28 | end |
---|
| 29 | rawset(t, n, v) |
---|
| 30 | end |
---|
| 31 | |
---|
| 32 | mt.__index = function (t, n) |
---|
[6774] | 33 | if not mt.__declared[n] then |
---|
| 34 | local d = debug.getinfo(2, "S") |
---|
| 35 | local w = d and d.what or "C" |
---|
| 36 | if w ~= "C" then |
---|
| 37 | error("Global variable '"..n.."' was not declared", 2) |
---|
| 38 | else |
---|
| 39 | mt.__declared[n] = true |
---|
| 40 | end |
---|
[6663] | 41 | end |
---|
| 42 | return rawget(t, n) |
---|
| 43 | end |
---|
| 44 | |
---|
| 45 | function global(...) |
---|
[6774] | 46 | for _, v in ipairs{...} do |
---|
| 47 | mt.__declared[v] = true |
---|
| 48 | end |
---|
[6663] | 49 | end |
---|
Note: See
TracBrowser
for help on using the repository browser.