Mercurial Hosting > luan
diff src/luan/interp/UnmExpr.java @ 35:e51906de0f11
implement metatables
git-svn-id: https://luan-java.googlecode.com/svn/trunk@36 21e917c8-12df-6dd8-5cb6-c86387c605b9
| author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
|---|---|
| date | Tue, 18 Dec 2012 07:05:58 +0000 |
| parents | 5cf15507d77e |
| children | 2a35154aec14 |
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--- a/src/luan/interp/UnmExpr.java Sun Dec 16 09:23:56 2012 +0000 +++ b/src/luan/interp/UnmExpr.java Tue Dec 18 07:05:58 2012 +0000 @@ -2,6 +2,7 @@ import luan.Lua; import luan.LuaNumber; +import luan.LuaFunction; import luan.LuaException; @@ -13,7 +14,13 @@ } @Override public Object eval(LuaStateImpl lua) throws LuaException { - double n = Lua.checkNumber(op.eval(lua)).value(); - return new LuaNumber( -n ); + Object o = op.eval(lua); + LuaNumber n = Lua.toNumber(o); + if( n != null ) + return new LuaNumber( -n.value() ); + LuaFunction fn = Utils.getHandler("__unm",o); + if( fn != null ) + return Utils.first(fn.call(lua,o)); + throw new LuaException("attempt to perform arithmetic on a "+Lua.type(o)+" value"); } }