新增UndefinedIdentifiersAsStrings

PublicTypes/ExpressionOptions.cs

@@ -36,6 +36,7 @@ namespace Flee.PublicTypes
             _myProperties.SetToDefault<Type>("ResultType");
             _myProperties.SetToDefault<bool>("IsGeneric");
             _myProperties.SetToDefault<bool>("IntegersAsDoubles");
+            _myProperties.SetToDefault<bool>("UndefinedIdentifiersAsStrings");
             _myProperties.SetValue("ParseCulture", CultureInfo.CurrentCulture);
             this.SetParseCulture(this.ParseCulture);
             _myProperties.SetValue("RealLiteralDataType", RealLiteralDataType.Double);
@@ -149,6 +150,15 @@ namespace Flee.PublicTypes
             get { return _myProperties.GetValue<RealLiteralDataType>("RealLiteralDataType"); }
             set { _myProperties.SetValue("RealLiteralDataType", value); }
         }
+
+        /// <summary>
+        /// 当标识符未定义时，是否自动将其转换为字符串字面量
+        /// </summary>
+        public bool UndefinedIdentifiersAsStrings
+        {
+            get { return _myProperties.GetValue<bool>("UndefinedIdentifiersAsStrings"); }
+            set { _myProperties.SetValue("UndefinedIdentifiersAsStrings", value); }
+        }
         #endregion
 
         #region "Properties - Non Public"