Last change
on this file since 7625 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 | |
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[6663] | 1 | -- |
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| 2 | -- strict.lua |
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| 3 | -- checks uses of undeclared global variables |
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| 4 | -- All global variables must be 'declared' through a regular assignment |
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| 5 | -- (even assigning nil will do) in a main chunk before being used |
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| 6 | -- anywhere or assigned to inside a function. |
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| 7 | -- |
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| 8 | |
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| 9 | local mt = getmetatable(_G) |
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| 10 | if mt == nil then |
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| 11 | mt = {} |
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| 12 | setmetatable(_G, mt) |
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| 13 | end |
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| 14 | |
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[6774] | 15 | __STRICT = true |
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[6663] | 16 | mt.__declared = {} |
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| 17 | |
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| 18 | mt.__newindex = function (t, n, v) |
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[6774] | 19 | if not mt.__declared[n] then |
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| 20 | if __STRICT then |
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| 21 | local d = debug.getinfo(2, "S") |
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| 22 | local w = d and d.what or "C" |
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| 23 | if w ~= "main" and w ~= "C" then |
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| 24 | error("Assigning to undeclared global variable '"..n.."'", 2) |
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| 25 | end |
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[6663] | 26 | end |
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| 27 | mt.__declared[n] = true |
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| 28 | end |
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| 29 | rawset(t, n, v) |
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| 30 | end |
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| 31 | |
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| 32 | mt.__index = function (t, n) |
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[6774] | 33 | if not mt.__declared[n] then |
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| 34 | local d = debug.getinfo(2, "S") |
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| 35 | local w = d and d.what or "C" |
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| 36 | if w ~= "C" then |
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| 37 | error("Global variable '"..n.."' was not declared", 2) |
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| 38 | else |
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| 39 | mt.__declared[n] = true |
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| 40 | end |
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[6663] | 41 | end |
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| 42 | return rawget(t, n) |
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| 43 | end |
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| 44 | |
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| 45 | function global(...) |
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[6774] | 46 | for _, v in ipairs{...} do |
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| 47 | mt.__declared[v] = true |
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| 48 | end |
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[6663] | 49 | end |
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