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view src/luan/interp/IndexExpr.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 | c84274b18f0c |
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package luan.interp; import luan.Luan; import luan.LuanException; import luan.LuanTable; import luan.LuanFunction; import luan.LuanSource; final class IndexExpr extends BinaryOpExpr { IndexExpr(LuanSource.Element se,Expr op1,Expr op2) { super(se,op1,op2); } @Override public Object eval(LuanStateImpl luan) throws LuanException { return index(luan,op1.eval(luan),op2.eval(luan)); } private Object index(LuanStateImpl luan,Object t,Object key) throws LuanException { Object h; if( t instanceof LuanTable ) { LuanTable tbl = (LuanTable)t; Object value = tbl.get(key); if( value != null ) return value; h = luan.getHandler("__index",t); if( h==null ) return null; } else { h = luan.getHandler("__index",t); if( h==null ) throw new LuanException( luan, se, "attempt to index a " + Luan.type(t) + " value" ); } if( h instanceof LuanFunction ) { LuanFunction fn = (LuanFunction)h; return Luan.first(luan.call(fn,se,"__index",t,key)); } return index(luan,h,key); } }