} //
/**
* returns false in case of error. closedTag returns true if the node is self-terminating: <node />
*/
private bool ReadStartTag(XMLNode node, ref bool closedTag)
{
if (!MatchChar(START_NODE))
{
this.error = true;
return(false);
}
string nodeName = this.ReadIdentifier();
if (this.error || nodeName == String.Empty)
{
return(false);
}
node.NodeName = nodeName;
Char next = this.GetNextNonWhite();
// READ ATTRIBUTES UNTIL THEY RUN OUT.
while (Char.IsLetter(next))
{
// backtrack to the character.
this.curIndex--;
if (!this.ReadAttribute(node))
{
this.error = true;
return(false);
}
next = this.GetNextNonWhite();
} //
// READ END TAG.
if (next == SLASH)
{
next = this.GetNextNonWhite();
if (next == END_NODE)
{
closedTag = true;
return(true);
}
}
else if (next == END_NODE)
{
closedTag = false;
return(true);
}
return(false);
} //
} //
public void AddNode(XMLNode node)
{
if (this._first == null)
{
this._first = this._last = node;
}
else
{
node.Prev = this._last;
node.Next = null;
node.Prev.Next = node;
this._last = node;
} //
} // addChild()
} //
public XMLNode Parse(string plainText)
{
this.error = false;
this.curIndex = 0;
this.text = plainText;
XMLNode node = this.ReadXMLNode();
if (node == null)
{
return(null);
}
return(node);
} //
} //
/**
* attempts to read a name="value" attribute, and returns false
* if parsing fails.
*/
private Boolean ReadAttribute(XMLNode node)
{
string attr = this.ReadIdentifier();
MatchChar(EQUAL_SIGN);
MatchChar(QUOTE_MARK);
string value = this.ReadText(QUOTE_MARK);
MatchChar(QUOTE_MARK);
// assign the attribute in the xml node.
node[attr] = value;
return(true);
} //
} //
/**
* read an xml node that has an opening tag.
*/
private XMLNode ReadXMLNode()
{
bool closedTag = false;
XMLNode node = new XMLNode();
if (!ReadStartTag(node, ref closedTag))
{
// error
return(null);
}
if (closedTag)
{
// node was self-contained: <node />
return(node);
}
// if the node turns out to be a text node, need to return to this index
// because any white space will be part of the text.
int saveIndex = curIndex;
Char next = this.GetNextNonWhite();
XMLNode child;
if (next == START_NODE)
{
do
{
next = this.GetNextNonWhite();
// backtrack so the '<' and what follows can be read by further parsing.
this.curIndex = saveIndex;
if (next == SLASH)
{
// found the start of an end node: "</"
// this has to be the end tag for this node, or there is an error.
break;
} //
child = this.ReadXMLNode();
if (child == null)
{
return(null);
}
node.AddChild(child);
// save position to return to the spot right before the '<' tag.
saveIndex = this.curIndex;
// get what should be the next '<' tag.
next = this.GetNextNonWhite();
} while (next == START_NODE);
}
else
{
// assume the node is text. attempt to parse text.
this.curIndex = saveIndex;
if (!this.ReadNodeText(node))
{
return(null);
}
} //
if (!ReadEndTag(node))
{
return(null);
}
return(node);
} //
} //
public XMLList()
{
this._first = null;
this._last = null;
} //