private ProcessingInstruction ParseProcessingInstruction()
{
int startPos = _pos;
string prefix = null, localName = null;
int index = _pos + 2; // Skip the <?
if (!ParseName(ref index, out prefix, out localName))
{
return(null);
}
;
ProcessingInstruction result = new ProcessingInstruction();
result.SetName(prefix, localName);
if (!ParseAttributes(ref index, result.Attributes))
{
return(null);
}
char c = _text[index];
if (c == '?')
{
index++;
if (index >= _length)
{
return(null);
}
c = _text[index];
}
if (c != '>')
{
// Everything worked, but this IS not a PI tag, not closed yet
return(null);
}
_pos = index + 1;
result.SetPosition(startPos, index);
return(result);
}
public Node ReadNext()
{
int startText = -1;
if (_previouslyReadNode != null)
{
Node node = _previouslyReadNode;
_previouslyReadNode = null;
return(node);
}
for (; _pos < _length - 1 /* we do this -1 since there is no possible node that only has 1 char */; _pos++)
{
int backupPos = _pos;
char c = _text[_pos];
switch (c)
{
case '<':
if (_text[_pos + 1] == '/')
{
ElementCloseTag closeTag = ParseClosingTag();
if (closeTag == null)
{
//here we should deal with non-element, only Text?
if (startText == -1)
{
startText = _pos;
}
}
else
{
if (startText != -1)
{
TextNode textNode = CheckForMissingText(startText, backupPos, closeTag);
if (textNode != null)
{
return(textNode);
}
}
return(closeTag);
}
}
else if (_text[_pos + 1] == '!')
{
Node result = null;
if (_pos + 3 < _length && _text[_pos + 2] == '-' && _text[_pos + 3] == '-')
{
result = ParseComment();
}
else
{
result = ParseDocumentType();
}
if (result == null)
{
if (startText == -1)
{
startText = _pos;
}
break;
}
else if (startText != -1)
{
TextNode textNode = CheckForMissingText(startText, backupPos, result); //backupPos +1
if (textNode != null)
{
return(textNode);
}
}
return(result);
}
else if (_text[_pos + 1] == '?')
{
ProcessingInstruction piTag = ParseProcessingInstruction();
if (piTag == null)
{
//here we should deal with non-element, only Text?
if (startText == -1)
{
startText = _pos;
}
}
else
{
if (startText != -1)
{
TextNode textNode = CheckForMissingText(startText, backupPos, piTag);
if (textNode != null)
{
return(textNode);
}
}
return(piTag);
}
}
else
{
Element element = ParseStartTag();
if (element != null)
{
if (startText != -1)
{
TextNode textNode = CheckForMissingText(startText, backupPos, element);
if (textNode != null)
{
return(textNode);
}
}
return(element);
}
else
{
//here we should deal with non-element, only Text?
if (startText == -1)
{
startText = _pos;
}
}
}
break;
// case '\r': case '\n':
// // only if this is first character from text it will be ignored
// break;
default:
if (startText == -1)
{
startText = _pos;
}
break;
}
}
if (startText == -1 && _pos == _length - 1)
{
startText = _pos;
_pos++;
}
if (startText != -1)
{
TextNode textNode = CheckForMissingText(startText, _length, null);
_pos = _length;
if (textNode != null)
{
return(textNode);
}
}
return(null);
}