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annotate src/luan/interp/ConcatExpr.java @ 49:8ede219cd111
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git-svn-id: https://luan-java.googlecode.com/svn/trunk@50 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 28 Dec 2012 19:35:04 +0000 |
parents | 64ecb7a3aad7 |
children | d6c454b7f58c |
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1 package luan.interp; |
8896068e0a4b
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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2 |
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3 import luan.Luan; |
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4 import luan.LuanFunction; |
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5 import luan.LuanException; |
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6 import luan.LuanSource; |
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7 |
8896068e0a4b
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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8 |
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9 final class ConcatExpr extends BinaryOpExpr { |
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10 |
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11 ConcatExpr(LuanSource.Element se,Expr op1,Expr op2) { |
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12 super(se,op1,op2); |
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13 } |
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14 |
49
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15 @Override public Object eval(LuanStateImpl luan) throws LuanException { |
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16 Object o1 = op1.eval(luan); |
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17 Object o2 = op2.eval(luan); |
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18 String s1 = Luan.asString(o1); |
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19 String s2 = Luan.asString(o2); |
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20 if( s1 != null && s2 != null ) |
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21 return s1 + s2; |
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22 LuanFunction fn = luan.getBinHandler(se,"__concat",o1,o2); |
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23 if( fn != null ) |
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24 return Luan.first(luan.call(fn,se,"__concat",o1,o2)); |
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25 String type = s1==null ? Luan.type(o1) : Luan.type(o2); |
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26 throw new LuanException( luan, se, "attempt to concatenate a " + type + " value" ); |
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27 } |
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28 } |