/// <summary>
/// 解析字符串
/// </summary>
/// <param name="ownerTemplate">宿主模板</param>
/// <param name="container">标签的容器</param>
/// <param name="text">模板文本数据</param>
private void ParseString(Template ownerTemplate, Tag container, string text)
{
//设置根文档模板
this.DocumentElement = ownerTemplate;
//this.Text = text;
if (string.IsNullOrEmpty(text))
{
return;
}
int charOffset = 0, offset = 0;
bool isClosedTag;
Match match = null;
//标签堆栈
Stack <Tag> tagStack = new Stack <Tag>();
tagStack.Push(container);
try
{
while (offset < text.Length)
{
if (ParserHelper.IsVariableTagStart(text, offset) && (match = ParserRegex.VarTagRegex.Match(text, offset)).Success) //匹配到模板变量
{
//构建文本节点
ParserHelper.CreateTextNode(ownerTemplate, container, text, charOffset, match.Index - charOffset);
//构建模板变量
ParserHelper.CreateVariableTag(ownerTemplate, container, match);
}
else if (ParserHelper.IsTagStart(text, offset) && (match = ParserRegex.TagRegex.Match(text, offset)).Success) //匹配到某种类型的标签
{
//构建文本节点
ParserHelper.CreateTextNode(ownerTemplate, container, text, charOffset, match.Index - charOffset);
//构建标签
Tag tag = ParserHelper.CreateTag(ownerTemplate, match, out isClosedTag);
//将标签加入堆栈
tagStack.Push(tag);
//将解析权交给标签
bool flag = tag.ProcessBeginTag(ownerTemplate, container, tagStack, text, ref match, isClosedTag);
//非已闭合标签或者是单标签则处理标签的结束标签
if (flag)
{
tag.ProcessEndTag(ownerTemplate, tag, tagStack, text, ref match);
}
if (tagStack.Count > 0 && tagStack.Peek() == tag && isClosedTag)
{
//闭合标签则回滚一级
tagStack.Pop();
}
//取得容器
if (tagStack.Count > 0)
{
container = tagStack.Peek();
}
}
else if (ParserHelper.IsCloseTagStart(text, offset) && (match = ParserRegex.EndTagRegex.Match(text, offset)).Success) //匹配到某个结束标签
{
//取得标签名称
string name = match.Groups["tagname"].Value;
//非匹配的结束标签.则模板有错
throw new ParserException("无效的结束标签");
}
else if (ParserHelper.IsVTExpressionStart(text, offset))
{
char s = ParserHelper.ReadChar(text, offset + ParserHelper.VTExpressionHead.Length);
int startOffset = offset + ParserHelper.VTExpressionHead.Length + 1;
int lastOffset = text.IndexOf(s, offset + ParserHelper.VTExpressionHead.Length + 1);
if (lastOffset == -1)
{
throw new ParserException(string.Format("无法找到VT表达式\"{0}\"的结束标记", ParserHelper.VTExpressionHead));
}
string code = text.Substring(startOffset, lastOffset - startOffset);
if (code.Length > 0)
{
//构建文本节点
ParserHelper.CreateTextNode(ownerTemplate, container, text, charOffset, offset - charOffset);
//解析表达式里的代码
new TemplateDocument(ownerTemplate, container, code, ownerTemplate.OwnerDocument.DocumentConfig);
}
offset = lastOffset + 1;
charOffset = offset;
continue;
}
else if (ParserHelper.IsCommentTagStart(text, offset))
{
//构建文本节点
ParserHelper.CreateTextNode(ownerTemplate, container, text, charOffset, offset - charOffset);
//找到注释的起始标记"<!--vt[",则直接查找结束标记"]-->"
offset = text.IndexOf(ParserHelper.CommentTagEnd, offset + ParserHelper.CommentTagStart.Length);
if (offset == -1)
{
throw new ParserException("无法找到注释的结束标记");
}
offset += ParserHelper.CommentTagEnd.Length;
charOffset = offset;
continue;
}
//处理偏移位置
if (match != null && match.Success)
{
charOffset = offset = match.Index + match.Length;
match = null;
}
else
{
offset++;
}
}
//处理文本字符
ParserHelper.CreateTextNode(ownerTemplate, container, text, charOffset, text.Length - charOffset);
if (tagStack.Count > 1)
{
//堆栈里还有其它元素.则有错误
throw new ParserException(string.Format("{0}标签未闭合", tagStack.Pop()));
}
}
catch (ParserException ex)
{
//如果错误中不包含行号与列号.则计算行号与列号
if (!ex.HaveLineAndColumnNumber && match != null && match.Success)
{
//获取当前出错时正在解析的模板文件
string file = string.Empty;
Tag tag = container;
while (string.IsNullOrEmpty(file) && tag != null)
{
if (tag is Template)
{
file = ((Template)tag).File;
}
else if (tag is IncludeTag)
{
file = ((IncludeTag)tag).File;
}
tag = tag.Parent;
}
if (string.IsNullOrEmpty(file))
{
throw new ParserException(Utility.GetLineAndColumnNumber(text, match.Index), match.ToString(), ex.Message);
}
else
{
throw new ParserException(file, Utility.GetLineAndColumnNumber(text, match.Index), match.ToString(), ex.Message);
}
}
else
{
//继续抛出错误
throw;
}
}
finally
{
//清空堆栈
tagStack.Clear();
tagStack = null;
}
}