Parses the specified block of a text
///<summary>
///Parses the specified block of a text
///</summary>
///<return>
///Returns the end position of a parsed block.
///</return>
protected int ParseBlock(XmlNode parentNode,TagBase parentTag,string text,int position)
{
#region check the arguments
if(parentNode==null)
{
throw new ArgumentNullException("parentNode");
}
checkTextAndPositionArguments(text,position);
#endregion
while(position<text.Length)
{
if(IsSkipWhiteSpace){SkipWhiteSpace(text,ref position);}
if(position==text.Length){break:}
#region Read the parent tag ending
if(parentTag!=null)
{
int myParentTagEndingEndPosition=parentTag.MatchEnd(text,position);
if(myParentTagEndPosition>=0)
{
position=myParentTagEndingEndPosition;
return position;
}
}
#endregion
Type myTagType=IsTag(text,position);
if(myTagType!=null)
{
#region Read a tag
#region Create the tag class instance
TypeBase myTag=Activator.CreateInstance(myTagType) as TagBase;
position=myTag.InitializeFromText(this,text,position,parentTag);
#endregion
#region Create an xml node for the tag
XmlNode myTagXmlNode=CreateTagXmlNode(myTag);
parentNode.AppendChild(myTagXmlNode);
#endregion
if(myTag.HasContents){position=ParseBlock(myTagXmlNode,myTag,text,position);}
#endregion
}
else
{
#region Read text
string myText=ReadWordOrSeparator(text,ref position,!IsSkipWhiteSpace);
parentNode.AppendChild(CreateTextXmlNode(myText));
#endregion
#endregion
}
}
if(parentTag!=null&&!parentTag.CanTerminateByStringEnd)
{
throw new Exception("Invalidate format");
}
return position;
}
=========
注意：
///<summary>
///Return the match attribute of the specified class.This attribute is used to identify a tag in a text.
///</summary>
public static MatchTagAttributeBase GetMatchAttribute(Type tag)
{
#region check the arguments
if(tag==null)
{
throw new ArgumentNullException("tag");
}
#endregion
object[] myMatchTagAttribute=tag.GetCustomAttributes(typeof(MatchTagAttributeBase),true);
if(myMatchTagAttributes==null||myMatchTagAttributes.Length==0){throw new Exception("Canneot find a match tag attribute.");}
if(myMatchTagAttributes.Length>1){throw new Exception("Ambiguous Match tag");}
return myMatchTagAttributes[0] as MatchTagAttributeBase;
}
