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view src/luan/interp/EqExpr.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 | 9381b23ea9e1 |
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package luan.interp; import luan.Luan; import luan.LuanFunction; import luan.LuanTable; import luan.LuanException; import luan.LuanSource; final class EqExpr extends BinaryOpExpr { EqExpr(LuanSource.Element se,Expr op1,Expr op2) { super(se,op1,op2); } @Override public Object eval(LuanStateImpl luan) throws LuanException { Object o1 = op1.eval(luan); Object o2 = op2.eval(luan); if( o1 == o2 || o1 != null && o1.equals(o2) ) return true; if( o1 instanceof Number && o2 instanceof Number ) { Number n1 = (Number)o1; Number n2 = (Number)o2; return n1.doubleValue() == n2.doubleValue(); } if( !o1.getClass().equals(o2.getClass()) ) return false; LuanTable mt1 = luan.getMetatable(o1); LuanTable mt2 = luan.getMetatable(o2); if( mt1==null || mt2==null ) return false; Object f = mt1.get("__eq"); if( f == null || !f.equals(mt2.get("__eq")) ) return null; LuanFunction fn = luan.checkFunction(se,f); return Luan.toBoolean( Luan.first(luan.call(fn,se,"__eq",o1,o2)) ); } }