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comparison src/luan/interp/UnmExpr.java @ 49:8ede219cd111

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add WebShell 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>
date Fri, 28 Dec 2012 19:35:04 +0000
parents 64ecb7a3aad7
children 6ca02b188dba
comparison
equal deleted inserted replaced
48:64ecb7a3aad7 49:8ede219cd111
11 11
12 UnmExpr(LuanSource.Element se,Expr op) { 12 UnmExpr(LuanSource.Element se,Expr op) {
13 super(se,op); 13 super(se,op);
14 } 14 }
15 15
16 @Override public Object eval(LuanStateImpl lua) throws LuanException { 16 @Override public Object eval(LuanStateImpl luan) throws LuanException {
17 Object o = op.eval(lua); 17 Object o = op.eval(luan);
18 Number n = Luan.toNumber(o); 18 Number n = Luan.toNumber(o);
19 if( n != null ) 19 if( n != null )
20 return -n.doubleValue(); 20 return -n.doubleValue();
21 LuanFunction fn = lua.getHandlerFunction(se,"__unm",o); 21 LuanFunction fn = luan.getHandlerFunction(se,"__unm",o);
22 if( fn != null ) { 22 if( fn != null ) {
23 return Luan.first(lua.call(fn,se,"__unm",o)); 23 return Luan.first(luan.call(fn,se,"__unm",o));
24 } 24 }
25 throw new LuanException(lua,se,"attempt to perform arithmetic on a "+Luan.type(o)+" value"); 25 throw new LuanException(luan,se,"attempt to perform arithmetic on a "+Luan.type(o)+" value");
26 } 26 }
27 } 27 }