Mercurial Hosting > luan
diff src/luan/interp/BinaryOpExpr.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 | b7d7069fee58 |
| children | 2a35154aec14 |
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--- a/src/luan/interp/BinaryOpExpr.java Sun Dec 16 09:23:56 2012 +0000 +++ b/src/luan/interp/BinaryOpExpr.java Tue Dec 18 07:05:58 2012 +0000 @@ -1,5 +1,10 @@ package luan.interp; +import luan.Lua; +import luan.LuaTable; +import luan.LuaFunction; +import luan.LuaException; + abstract class BinaryOpExpr implements Expr { final Expr op1; @@ -9,4 +14,19 @@ this.op1 = op1; this.op2 = op2; } + + static final LuaFunction getBinHandler(String op,Object o1,Object o2) throws LuaException { + LuaFunction f1 = Utils.getHandler(op,o1); + if( f1 != null ) + return f1; + return Utils.getHandler(op,o2); + } + + static final Object arithmetic(LuaStateImpl lua,String op,Object o1,Object o2) throws LuaException { + LuaFunction fn = getBinHandler(op,o1,o2); + if( fn != null ) + return Utils.first(fn.call(lua,o1,o2)); + String type = Lua.toNumber(o1)==null ? Lua.type(o1) : Lua.type(o2); + throw new LuaException("attempt to perform arithmetic on a "+type+" value"); + } }