--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/luan/interp/LtExpr.java	Wed Nov 21 06:57:09 2012 +0000
@@ -0,0 +1,30 @@
+package luan.interp;
+
+import luan.Lua;
+import luan.LuaNumber;
+import luan.LuaException;
+import luan.LuaState;
+
+
+final class LtExpr extends BinaryOpExpr {
+
+	LtExpr(Expr op1,Expr op2) {
+		super(op1,op2);
+	}
+
+	@Override Object eval(LuaState lua) throws LuaException {
+		Object v1 = op1.eval(lua);
+		Object v2 = op2.eval(lua);
+		if( v1 instanceof LuaNumber && v2 instanceof LuaNumber ) {
+			LuaNumber n1 = (LuaNumber)v1;
+			LuaNumber n2 = (LuaNumber)v2;
+			return n1.compareTo(n2) < 0;
+		}
+		if( v1 instanceof String && v2 instanceof String ) {
+			String s1 = (String)v1;
+			String s2 = (String)v2;
+			return s1.compareTo(s2) < 0;
+		}
+		throw new LuaException( "attempt to compare " + Lua.type(v1) + " with " + Lua.type(v2) );
+	}
+}