예제 #1
0
        /// <summary>
        /// 收集子标签。
        /// </summary>
        /// <param name="tag">指定一个标签实例。</param>
        /// <param name="index">指定标签索引。</param>
        /// <returns>Tag</returns>
        private Tag CollectForTag(Tag tag, ref int index)
        {
            if (tag.IsClosed) return tag;
            if (string.Compare(tag.Name, "if", true) == 0) tag = new TagIf(tag.Line, tag.Col, tag.AttributeValue("test"));

            Tag collectTag = tag;

            for (index++; index < _Elements.Count; index++)
            {
                Element elem = _Elements[index];

                if (elem is Text)
                    collectTag.InnerElements.Add(elem);
                else if (elem is Expression)
                    collectTag.InnerElements.Add(elem);
                else if (elem is Tag)
                {
                    Tag innerTag = (Tag)elem;
                    if (string.Compare(innerTag.Name, "else", true) == 0)
                    {
                        if (collectTag is TagIf)
                        {
                            ((TagIf)collectTag).FalseBranch = innerTag;
                            collectTag = innerTag;
                        }
                        else
                            throw new ParseException("else 标签必须包含在 if 或 elseif 之内。", innerTag.Line, innerTag.Col);

                    }
                    else if (string.Compare(innerTag.Name, "elseif", true) == 0)
                    {
                        if (collectTag is TagIf)
                        {
                            Tag newTag = new TagIf(innerTag.Line, innerTag.Col, innerTag.AttributeValue("test"));
                            ((TagIf)collectTag).FalseBranch = newTag;
                            collectTag = newTag;
                        }
                        else
                            throw new ParseException("elseif 标签位置不正确。", innerTag.Line, innerTag.Col);
                    }
                    else
                        collectTag.InnerElements.Add(CollectForTag(innerTag, ref index));
                }
                else if (elem is TagClose)
                {
                    TagClose tagClose = (TagClose)elem;
                    if (string.Compare(tag.Name, tagClose.Name, true) == 0)
                        return tag;

                    throw new ParseException("没有为闭合标签 " + tagClose.Name + " 找到合适的开始标签。", elem.Line, elem.Col);
                }
                else
                    throw new ParseException("无效标签: " + elem.GetType().ToString(), elem.Line, elem.Col);
            }

            throw new ParseException("没有为开始标签 " + tag.Name + " 找到合适的闭合标签。", tag.Line, tag.Col);
        }
예제 #2
0
        /// <summary>
        /// 处理 If 语句。
        /// </summary>
        /// <param name="tagIf">包含 if 语句的标签实例。</param>
        protected void ProcessIf(TagIf tagIf)
        {
            bool condition = false;

            try
            {
                object value = this.EvalExpression(tagIf.Test);

                condition = Smart.Framework.Utility.Converter.ToBool(value);
            }
            catch (Exception ex)
            {
                this.DisplayError("遭遇非法的 If 语句。" + ex.Message,
                    tagIf.Line, tagIf.Col);
                return;
            }

            if (condition)
                this.ProcessElements(tagIf.InnerElements);
            else
                this.ProcessElement(tagIf.FalseBranch);
        }