Mercurial Hosting > luan
view src/luan/interp/LenExpr.java @ 88:6ca02b188dba
add LuanBit to clean up code;
add repr();
git-svn-id: https://luan-java.googlecode.com/svn/trunk@89 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
---|---|
date | Wed, 27 Feb 2013 23:50:32 +0000 |
parents | 8ede219cd111 |
children | f5af13062b10 |
line wrap: on
line source
package luan.interp; 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(); } LuanBit bit = luan.bit(se); LuanFunction fn = bit.getHandlerFunction("__len",o); if( fn != null ) return Luan.first(bit.call(fn,"__len",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" ); } }