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annotate src/luan/interp/IndexExpr.java @ 56:c84274b18f0c

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various git-svn-id: https://luan-java.googlecode.com/svn/trunk@57 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 04 Jan 2013 21:35:55 +0000
parents 8ede219cd111
children 6ca02b188dba
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1 package luan.interp;
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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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10 final class IndexExpr extends BinaryOpExpr {
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12 IndexExpr(LuanSource.Element se,Expr op1,Expr op2) {
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13 super(se,op1,op2);
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14 }
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16 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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17 return index(luan,op1.eval(luan),op2.eval(luan));
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18 }
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20 private Object index(LuanStateImpl luan,Object t,Object key) throws LuanException {
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21 Object h;
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22 if( t instanceof LuanTable ) {
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23 LuanTable tbl = (LuanTable)t;
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24 Object value = tbl.get(key);
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25 if( value != null )
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26 return value;
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27 h = luan.getHandler("__index",t);
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28 if( h==null )
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29 return null;
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30 } else {
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31 h = luan.getHandler("__index",t);
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32 if( h==null )
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33 throw new LuanException( luan, op1.se(), "attempt to index '"+op1.se().text()+"' (a " + Luan.type(t) + " value)" );
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34 }
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35 if( h instanceof LuanFunction ) {
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36 LuanFunction fn = (LuanFunction)h;
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37 return Luan.first(luan.call(fn,se,"__index",t,key));
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38 }
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39 return index(luan,h,key);
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40 }
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41 }