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view core/src/luan/impl/LenExpr.java @ 338:f05c631ebaaf
README.md edited online with Bitbucket
author | Hugo Teixeira <hugo.tech@gmail.com> |
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date | Wed, 25 Mar 2015 04:29:32 +0000 |
parents | 3dcb0f9bee82 |
children | d55e873e1f0d |
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package luan.impl; import luan.Luan; import luan.LuanTable; import luan.LuanFunction; import luan.LuanException; import luan.LuanSource; import luan.LuanBit; final class LenExpr extends UnaryOpExpr { LenExpr(LuanSource.Element se,Expr op) { super(se,op); } @Override public Object eval(LuanStateImpl luan) throws LuanException { Object o = op.eval(luan); if( o instanceof String ) { String s = (String)o; return s.length(); } if( o instanceof byte[] ) { byte[] a = (byte[])o; return a.length; } LuanBit bit = luan.bit(se); LuanFunction fn = bit.getHandlerFunction("__len",o); if( fn != null ) return Luan.first(bit.call(fn,"__len",new Object[]{o})); if( o instanceof LuanTable ) { LuanTable t = (LuanTable)o; return t.length(); } throw bit.exception( "attempt to get length of a " + Luan.type(o) + " value" ); } }