Mercurial Hosting > luan
view core/src/luan/impl/LenExpr.java @ 404:d55e873e1f0d
metatables now only apply to tables
author | Franklin Schmidt <fschmidt@gmail.com> |
---|---|
date | Wed, 29 Apr 2015 07:04:40 -0600 |
parents | 3dcb0f9bee82 |
children | d9df6d6cb927 |
line wrap: on
line source
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; LuanFunction fn = bit.getHandlerFunction("__len",t); if( fn != null ) return Luan.first(bit.call(fn,"__len",new Object[]{o})); return t.length(); } }