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annotate src/luan/interp/UnmExpr.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 | 6ca02b188dba |
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1 package luan.interp; |
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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 |
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8 |
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9 // unary minus |
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10 final class UnmExpr extends UnaryOpExpr { |
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11 |
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12 UnmExpr(LuanSource.Element se,Expr op) { |
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13 super(se,op); |
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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 Object o = op.eval(luan); |
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18 Number n = Luan.toNumber(o); |
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19 if( n != null ) |
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20 return -n.doubleValue(); |
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21 LuanFunction fn = luan.getHandlerFunction(se,"__unm",o); |
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22 if( fn != null ) { |
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23 return Luan.first(luan.call(fn,se,"__unm",o)); |
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24 } |
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25 throw new LuanException(luan,se,"attempt to perform arithmetic on a "+Luan.type(o)+" value"); |
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26 } |
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27 } |