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annotate core/src/luan/impl/IndexExpr.java @ 426:23a93c118042

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fix LuanTable.get() to use metatables
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 01 May 2015 18:44:20 -0600
parents b31d614343e8
children b48cfa14ba60
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4eaee12f6c65 move luan/interp to impl
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1 package luan.impl;
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3 import luan.Luan;
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4 import luan.LuanException;
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5 import luan.LuanTable;
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6 import luan.LuanFunction;
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7 import luan.LuanSource;
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8 import luan.LuanMeta;
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9 import luan.modules.StringLuan;
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10 import luan.modules.BinaryLuan;
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11 import luan.modules.JavaLuan;
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14 final class IndexExpr extends BinaryOpExpr {
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16 IndexExpr(LuanSource.Element se,Expr op1,Expr op2) {
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17 super(se,op1,op2);
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18 }
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20 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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21 return index(luan,op1.eval(luan),op2.eval(luan));
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22 }
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24 private Object index(LuanStateImpl luan,Object obj,Object key) throws LuanException {
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25 if( obj instanceof LuanTable ) {
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26 LuanTable tbl = (LuanTable)obj;
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23a93c118042 fix LuanTable.get() to use metatables
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27 return tbl.get(luan,key);
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28 }
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29 if( obj instanceof String )
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30 return StringLuan.__index(luan,(String)obj,key);
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31 if( obj instanceof byte[] )
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32 return BinaryLuan.__index(luan,(byte[])obj,key);
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33 if( obj != null && luan.currentEnvironment().hasJava() )
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34 return JavaLuan.__index(luan,obj,key);
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35 else
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36 throw luan.bit(op1.se()).exception( "attempt to index '"+op1.se().text()+"' (a " + Luan.type(obj) + " value)" );
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37 }
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38 }