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view core/src/luan/impl/LenExpr.java @ 432:d9df6d6cb927
finish fixing LuanTable to use metatables
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Sat, 02 May 2015 23:41:59 -0600 |
parents | d55e873e1f0d |
children | b48cfa14ba60 |
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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); if( !(o instanceof LuanTable) ) throw bit.exception( "attempt to get length of a " + Luan.type(o) + " value" ); LuanTable t = (LuanTable)o; return t.length(luan); } }