Mercurial Hosting > luan
annotate core/src/luan/impl/IndexExpr.java @ 307:4bf49f0a46b3
improve build process
git-svn-id: https://luan-java.googlecode.com/svn/trunk@308 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 23 Dec 2014 05:28:51 +0000 |
parents | 3dcb0f9bee82 |
children | d55e873e1f0d |
rev | line source |
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move luan/interp to impl
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1 package luan.impl; |
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2 |
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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 |
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9 |
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10 final class IndexExpr extends BinaryOpExpr { |
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11 |
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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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15 |
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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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19 |
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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 luan.bit(op1.se()).exception( "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.bit(se).call(fn,"__index",new Object[]{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 } |