Last change
on this file since 7387 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
|
Line | |
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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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15 | __STRICT = true |
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16 | mt.__declared = {} |
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17 | |
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18 | mt.__newindex = function (t, n, v) |
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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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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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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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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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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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49 | end |
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