Mercurial Hosting > luan
view core/src/luan/impl/UnmExpr.java @ 609:24b05963ba62
shell "clear" button now clears the session
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Wed, 09 Dec 2015 18:12:16 -0700 |
parents | 60c549d43988 |
children | 859c0dedc8b6 |
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package luan.impl; import luan.Luan; import luan.LuanFunction; import luan.LuanException; import luan.LuanElement; import luan.LuanTable; // unary minus final class UnmExpr extends UnaryOpExpr { UnmExpr(LuanElement el,Expr op) { super(el,op); } @Override public Object eval(LuanStateImpl luan) throws LuanException { Object o = op.eval(luan); if( o instanceof Number ) return -((Number)o).doubleValue(); luan.push(el,null); try { if( o instanceof LuanTable ) { LuanFunction fn = luan.getHandlerFunction("__unm",(LuanTable)o); if( fn != null ) { return Luan.first(fn.call(luan,new Object[]{o})); } } throw new LuanException(luan,"attempt to perform arithmetic on a "+Luan.type(o)+" value"); } finally { luan.pop(); } } }