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view 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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package luan.interp; import luan.Luan; import luan.LuanFunction; import luan.LuanException; import luan.LuanSource; // unary minus final class UnmExpr extends UnaryOpExpr { UnmExpr(LuanSource.Element se,Expr op) { super(se,op); } @Override public Object eval(LuanStateImpl luan) throws LuanException { Object o = op.eval(luan); Number n = Luan.toNumber(o); if( n != null ) return -n.doubleValue(); LuanFunction fn = luan.getHandlerFunction(se,"__unm",o); if( fn != null ) { return Luan.first(luan.call(fn,se,"__unm",o)); } throw new LuanException(luan,se,"attempt to perform arithmetic on a "+Luan.type(o)+" value"); } }