/// <summary>
/// 解析 html
/// 返回文档
/// </summary>
/// <param name="content">要解析的 html</param>
/// <returns>DOM 文档</returns>
public static Document Parse(string content)
{
//创建标签阅读器
ReaderBase reader = new TagReader();
//阅读器上下文
Context context = new Context(content, c => HtmlParser.Parse(c));
//设置上下文
reader.Context = context;
//读取所有内容
while (true)
{
//执行读取 返回下一个阅读器
reader = reader.Read();
//不返回阅读器 读取完毕 跳出
if (reader.IsNull())
{
break;
}
}
//返回文档元素
return(context.Document);
}
/// <summary>
/// 阅读
/// </summary>
/// <returns></returns>
internal override ReaderBase Read()
{
//匹配标签 或注释
Match match = TagReader.Pattern.Match(this.Content, this.Position);
//如果匹配成功
if (match.Success)
{
//提升阅读位置
this.Ascend(match);
//捕获的注释
Group comment = match.Groups["comment"];
//如果是注释
if (comment.Success)
{
//加入文本节点
this.AddText(match);
//加入注释节点
this.CurrentNode.appendChild(new Comment(match.Index, this.Position - 1));
//结束标签
return(this.EndTag(Comment.NodeName));
}
//捕获的开标签
Group open = match.Groups["open"];
//如果是开标签
if (open.Success)
{
//捕获的空白结束
Group space = match.Groups["space"];
//捕获的开双标签结束
Group xdouble = match.Groups["double"];
//加入文本节点
this.AddText(match);
//创建元素实例
Element element = this.Document.createElement(open.Value);
//设置元素起始位置
element.Begin = match.Index;
//如果标签未结束
if (space.Success)
{
//对表格型元素的处理
if (element.IsTable)
{
if (this.MarkStackExists(element.Name))
{
int end = this.Previous.Position - 1;
this.CloseTag(element.Name, end, end);
}
}
//对枚举型元素的处理
if (element.IsEnum)
{
if (this.MarkStackLast(element.Name))
{
int end = this.Previous.Position - 1;
this.CloseTag(element.Name, end, end);
}
}
//加入节点
this.CurrentNode.appendChild(element);
//读取属性
return(this.Pass <AttributeReader>().Set(element));
}
//如果标签已结束
else
{
TagReader reader = null;
//对表格型元素的处理
if (element.IsTable)
{
if (this.MarkStackExists(element.Name))
{
int end = this.Previous.Position - 1;
reader = this.CloseTag(element.Name, end, end);
}
}
//对枚举型元素的处理
if (element.IsEnum)
{
if (this.MarkStackLast(element.Name))
{
int end = this.Previous.Position - 1;
reader = this.CloseTag(element.Name, end, end);
}
}
//加入节点
this.CurrentNode.appendChild(element);
element.InnerBegin = this.Position;
//如果是双标签
if (xdouble.Success)
{
//单标签元素
if (element.IsSingle)
{
element.InnerEnd = this.Position - 1;
element.End = element.InnerEnd;
}
//不是单标签元素
else
{
//开标签
this.OpenTag(element);
}
}
//如果是单标签
else
{
element.InnerEnd = this.Position - 1;
element.End = element.InnerEnd;
}
if (reader.IsNull())
{
//结束标签
return(this.EndTag(element.Name));
}
else
{
return(reader);
}
}
}
//如果是闭标签
else
{
//捕获的闭标签名
string name = match.Groups["close"].Value;
//捕获的空白结束
Group closeSpace = match.Groups["space"];
//加入文本节点
this.AddText(match);
//如果闭标签未结束
if (closeSpace.Success)
{
//读取属性
return(this.Pass <AttributeReader>().Set(name, match.Index));
}
//如果闭标签已结束
else
{
//关闭标签
return(this.CloseTag(name, match.Index - 1));
}
}
}
else
{
return(this.Pass <EndingReader>());
}
}
