Mercurial Hosting > luan
diff src/luan/interp/Utils.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 | |
children | 2a35154aec14 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/luan/interp/Utils.java Tue Dec 18 07:05:58 2012 +0000 @@ -0,0 +1,28 @@ +package luan.interp; + +import luan.Lua; +import luan.LuaFunction; +import luan.LuaTable; +import luan.LuaException; + + +final class Utils { + private Utils() {} // never + + static Object first(Object[] a) { + return a.length==0 ? null : a[0]; + } + + static final Object getHandlerObject(String op,Object obj) throws LuaException { + LuaTable t = Lua.getMetatable(obj); + return t==null ? null : t.get(op); + } + + static final LuaFunction getHandler(String op,Object obj) throws LuaException { + Object f = getHandlerObject(op,obj); + if( f == null ) + return null; + return Lua.checkFunction(f); + } + +}