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view core/src/luan/impl/IndexExpr.java @ 334:25db50d382cb
README.md edited online with Bitbucket
author | Hugo Teixeira <hugo.tech@gmail.com> |
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date | Wed, 25 Mar 2015 04:28:26 +0000 |
parents | 3dcb0f9bee82 |
children | d55e873e1f0d |
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package luan.impl; 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 luan.bit(op1.se()).exception( "attempt to index '"+op1.se().text()+"' (a " + Luan.type(t) + " value)" ); } if( h instanceof LuanFunction ) { LuanFunction fn = (LuanFunction)h; return Luan.first(luan.bit(se).call(fn,"__index",new Object[]{t,key})); } return index(luan,h,key); } }