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annotate src/luan/interp/LenExpr.java @ 112:f5af13062b10
fix previous rev
git-svn-id: https://luan-java.googlecode.com/svn/trunk@113 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 23 May 2014 22:52:39 +0000 |
parents | 6ca02b188dba |
children | c599206448b9 |
rev | line source |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan.interp; |
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2 |
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3 import luan.Luan; |
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4 import luan.LuanTable; |
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5 import luan.LuanFunction; |
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6 import luan.LuanException; |
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7 import luan.LuanSource; |
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8 import luan.LuanBit; |
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9 |
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10 |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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11 final class LenExpr extends UnaryOpExpr { |
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12 |
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13 LenExpr(LuanSource.Element se,Expr op) { |
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14 super(se,op); |
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15 } |
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16 |
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17 @Override public Object eval(LuanStateImpl luan) throws LuanException { |
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18 Object o = op.eval(luan); |
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19 if( o instanceof String ) { |
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20 String s = (String)o; |
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21 return s.length(); |
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22 } |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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23 LuanBit bit = luan.bit(se); |
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24 LuanFunction fn = bit.getHandlerFunction("__len",o); |
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25 if( fn != null ) |
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26 return Luan.first(bit.call(fn,"__len",new Object[]{o})); |
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27 if( o instanceof LuanTable ) { |
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28 LuanTable t = (LuanTable)o; |
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29 return t.length(); |
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30 } |
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31 throw bit.exception( "attempt to get length of a " + Luan.type(o) + " value" ); |
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32 } |
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33 } |