--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/src/luan/impl/ExpList.java	Sun Jun 22 05:41:22 2014 +0000
@@ -0,0 +1,96 @@
+package luan.impl;
+
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Arrays;
+import luan.LuanException;
+import luan.LuanSource;
+import luan.LuanFunction;
+import luan.Luan;
+
+
+final class ExpList {
+
+	static final Expressions emptyExpList = new Expressions() {
+
+		@Override public Object[] eval(LuanStateImpl luan) {
+			return LuanFunction.NOTHING;
+		}
+
+		@Override public LuanSource.Element se() {
+			return null;
+		}
+	};
+
+	static Expr[] toArray(List<Expressions> list) {
+		Expr[] a = new Expr[list.size()];
+		for( int i=0; i<a.length; i++ ) {
+			Expressions exprs = list.get(i);
+			if( exprs instanceof Expr ) {
+				a[i] = (Expr)exprs;
+			} else {
+				a[i] = new ExpressionsExpr(exprs);
+			}
+		}
+		return a;
+	}
+
+	static Expressions build(List<Expressions> list) {
+		switch(list.size()) {
+		case 0:
+			return emptyExpList;
+		case 1:
+			return list.get(0);
+		default:
+			if( list.get(list.size()-1) instanceof Expr ) {
+				return new ExprList1( toArray(list) );
+			} else {
+				Expressions last = list.remove(list.size()-1);
+				return new ExprList2( toArray(list), last );
+			}
+		}
+	}
+
+	private static class ExprList1 implements Expressions {
+		private final Expr[] exprs;
+
+		private ExprList1(Expr[] exprs) {
+			this.exprs = exprs;
+		}
+	
+		@Override public Object eval(LuanStateImpl luan) throws LuanException {
+			Object[] a = new Object[exprs.length];
+			for( int i=0; i<exprs.length; i++ ) {
+				a[i] = exprs[i].eval(luan);
+			}
+			return a;
+		}
+	
+		@Override public LuanSource.Element se() {
+			return new LuanSource.Element(exprs[0].se().source,exprs[0].se().start,exprs[exprs.length-1].se().end);
+		}
+	}
+
+	private static class ExprList2 implements Expressions {
+		private final Expr[] exprs;
+		private final Expressions last;
+	
+		private ExprList2(Expr[] exprs,Expressions last) {
+			this.exprs = exprs;
+			this.last = last;
+		}
+	
+		@Override public Object eval(LuanStateImpl luan) throws LuanException {
+			List<Object> list = new ArrayList<Object>();
+			for( Expr expr : exprs ) {
+				list.add( expr.eval(luan) );
+			}
+			list.addAll( Arrays.asList(Luan.array( last.eval(luan) )) );
+			return list.toArray();
+		}
+	
+		@Override public LuanSource.Element se() {
+			return new LuanSource.Element(exprs[0].se().source,exprs[0].se().start,last.se().end);
+		}
+	}
+}