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comparison src/luan/interp/IndexExpr.java @ 3:7a2cdbc5767f

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add LuaState git-svn-id: https://luan-java.googlecode.com/svn/trunk@4 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 16 Nov 2012 05:23:12 +0000
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2:4da26b11d12a 3:7a2cdbc5767f
1 package luan.interp;
2
3 import luan.Lua;
4 import luan.LuaException;
5 import luan.LuaState;
6 import luan.LuaTable;
7
8
9 final class IndexExpr extends BinaryOpExpr {
10
11 IndexExpr(Expr op1,Expr op2) {
12 super(op1,op2);
13 }
14
15 @Override Object eval(LuaState lua) throws LuaException {
16 Object t = op1.eval(lua);
17 if( t instanceof LuaTable ) {
18 LuaTable tbl = (LuaTable)t;
19 Object key = op2.eval(lua);
20 return tbl.get(key);
21 }
22 throw new LuaException( "attempt to index a " + Lua.type(t) + " value" );
23 }
24 }