Mercurial Hosting > luan
view core/src/luan/impl/UnmExpr.java @ 652:067d9470184d
compile SetStmt and ForStmt
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Mon, 04 Apr 2016 23:26:06 -0600 |
parents | 8e8c30b72e9b |
children |
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package luan.impl; import luan.Luan; import luan.LuanFunction; import luan.LuanException; import luan.LuanTable; // unary minus final class UnmExpr extends UnaryOpExpr { UnmExpr(Expr op) { super(op); } @Override public Object eval(LuanStateImpl luan) throws LuanException { Object o = op.eval(luan); if( o instanceof Number ) return -((Number)o).doubleValue(); 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("attempt to perform arithmetic on a "+Luan.type(o)+" value"); } }