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annotate core/src/luan/impl/IndexExpr.java @ 404:d55e873e1f0d

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metatables now only apply to tables
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 29 Apr 2015 07:04:40 -0600
parents 3dcb0f9bee82
children 3e68917a0dc6
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4eaee12f6c65 move luan/interp to impl
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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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.modules.StringLuan;
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9 import luan.modules.BinaryLuan;
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10 import luan.modules.JavaLuan;
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13 final class IndexExpr extends BinaryOpExpr {
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15 IndexExpr(LuanSource.Element se,Expr op1,Expr op2) {
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16 super(se,op1,op2);
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17 }
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19 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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20 return index(luan,op1.eval(luan),op2.eval(luan));
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21 }
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23 private Object index(LuanStateImpl luan,Object obj,Object key) throws LuanException {
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24 if( obj instanceof LuanTable ) {
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25 LuanTable tbl = (LuanTable)obj;
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26 Object value = tbl.get(key);
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27 if( value != null )
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28 return value;
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29 Object h = luan.getHandler("__index",tbl);
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30 if( h==null )
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31 return null;
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32 if( h instanceof LuanFunction ) {
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33 LuanFunction fn = (LuanFunction)h;
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34 return Luan.first(luan.bit(se).call(fn,"__index",new Object[]{tbl,key}));
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35 }
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36 return index(luan,h,key);
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37 }
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38 if( obj instanceof String )
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39 return StringLuan.__index(luan,(String)obj,key);
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40 if( obj instanceof byte[] )
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41 return BinaryLuan.__index(luan,(byte[])obj,key);
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42 Object value = JavaLuan.__index(luan,obj,key);
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43 if( value != null )
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44 return value;
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45 throw luan.bit(op1.se()).exception( "attempt to index '"+op1.se().text()+"' (a " + Luan.type(obj) + " value)" );
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46 }
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47 }