public static XPathItem ParseNew(string xpath)
{
bool expisparexp = false;
var pathitem = new XPathItem();
var curblock = new XPathBlock();
StringBuilder curstr = new StringBuilder();
IXPathBlockContainer current = pathitem;
XPathBlocks blocks = new XPathBlocks();
current.XPathBlockList.Add(blocks);
XPathExpressions curexp = curblock.XPathExpressions;
for (int i = 0; i < xpath.Length; i++)
{
var cur = xpath[i];
var next = (i + 1 < xpath.Length) ? xpath[i + 1] : '\0';
if (cur == '|' || cur == ')' || cur == '(')
{
if (string.IsNullOrEmpty(curblock.BlockName))
{
curblock.BlockName = curstr.ToString();
}
if (!string.IsNullOrEmpty(curblock.BlockName) || curblock.IsAttributeSelector)
{
blocks.Add(curblock);
}
curstr.Clear();
}
if (cur == '[')
{
if (curblock.XPathExpressions.Count == 0)
{
curblock.BlockName = curstr.ToString();
curstr.Clear();
}
XPathExpression newexp = null;
newexp = XPathExpression.Parse(xpath, ref i);
if (!string.IsNullOrEmpty(curblock.BlockName))
{
curblock.XPathExpressions.Add(newexp);
}
else
{
curexp.Add(newexp);
}
continue;
}
else if (cur == '|' || cur == '(')
{
var lastitem = current.XPathBlockList.Last();
if (lastitem != null)
{
if (!lastitem.Any())
{
current.XPathBlockList.RemoveAt(current.XPathBlockList.Count - 1);
}
}
curblock = new XPathBlock();
curexp = curblock.XPathExpressions;
if (cur == '(')
{
var xpar = new XPathPar();
xpar.Parent = current;
current.XPathBlockList.Add(xpar);
current = xpar;
}
else
{
current.XPathBlockList.Add(new XPathOrItem());
}
blocks = new XPathBlocks();
current.XPathBlockList.Add(blocks);
continue;
}
else if (cur == ')')
{
var lastitem = current.XPathBlockList.Last();
if (lastitem != null)
{
if (!lastitem.Any())
{
current.XPathBlockList.RemoveAt(current.XPathBlockList.Count - 1);
}
}
curexp = (current as XPathPar).XPathExpressions;
current = current.Parent;
expisparexp = true;
if (current == null)
{
throw new Exception("Syntax error");
}
blocks = new XPathBlocks();
current.XPathBlockList.Add(blocks);
// current.XPathBlockList.Add(blocks);
curblock = new XPathBlock();
continue;
}
else if (cur == '/')
{
if (string.IsNullOrEmpty(curblock.BlockName))
{
curblock.BlockName = curstr.ToString();
}
if (string.IsNullOrEmpty(curblock.BlockName))
{
if (next == '/')
{
curblock.BlockType = XPathBlockType.XPathBlockScanAllElem;
i += 1;
}
}
else
{
blocks.Add(curblock);
curblock = new XPathBlock();
if (next == '/')
{
curblock.BlockType = XPathBlockType.XPathBlockScanAllElem;
}
curstr.Clear();
}
if (expisparexp)
{
curexp = curblock.XPathExpressions;
expisparexp = false;
}
continue;
}
else if (cur == '@')
{
if (string.IsNullOrEmpty(curblock.BlockName))
{
curblock.IsAttributeSelector = true;
}
else
{
throw new Exception("Syntax Error");
}
continue;
}
else
{
}
curstr.Append(cur);
}
if (string.IsNullOrEmpty(curblock.BlockName))
{
curblock.BlockName = curstr.ToString();
}
if (!string.IsNullOrEmpty(curblock.BlockName) || curblock.IsAttributeSelector)
{
blocks.Add(curblock);
//current.XPathBlockList.Add(curblock);
}
var sonitem = current.XPathBlockList.Last();
if (sonitem != null)
{
if (!sonitem.Any())
{
current.XPathBlockList.RemoveAt(current.XPathBlockList.Count - 1);
}
}
return(pathitem);
}
public XPathItem()
{
blocks = new XPathBlocks();
xpathBlockList = new XPathBlockContainer();
}