public ForwardAxis(DoubleLinkAxis axis, bool isdesorself)
{
this.isDss = isdesorself;
this.isAttribute = Asttree.IsAttribute(axis);
this.topNode = axis;
this.rootNode = axis;
while (this.rootNode.Input != null)
{
this.rootNode = (DoubleLinkAxis)(this.rootNode.Input);
}
// better to calculate it out, since it's used so often, and if the top is self then the whole tree is self
this.isSelfAxis = Asttree.IsSelf(this.topNode);
}
//constructor
internal DoubleLinkAxis(Axis axis, DoubleLinkAxis inputaxis)
{
this.next = null;
this._input = inputaxis;
this._urn = axis.URN;
this._prefix = axis.Prefix;
this._name = axis.Name;
this._nodetype = axis.Type;
this._axistype = axis.TypeOfAxis;
this.abbrAxis = axis.abbrAxis;
if (inputaxis != null)
{
inputaxis.Next = this;
}
}
// equal & ! attribute then move
// "a/b/c" pointer from a move to b
// return true if reach c and c is an element and c is the axis
internal bool MoveToChild(string name, string URN, int depth, ForwardAxis parent)
{
// an attribute can never be the same as an element
if (Asttree.IsAttribute(this.curNode))
{
return(false);
}
// either moveToParent or moveToChild status will have to be changed into unmatch...
if (this.isMatch)
{
this.isMatch = false;
}
if (!AxisStack.Equal(this.curNode.Name, this.curNode.URN, name, URN))
{
return(false);
}
if (this.curDepth == -1)
{
SetDepth(depth);
}
else if (depth > this.curDepth)
{
return(false);
}
// matched ...
if (this.curNode == parent.TopNode)
{
this.isMatch = true;
return(true);
}
// move down this.curNode
DoubleLinkAxis nowNode = (DoubleLinkAxis)(this.curNode.Next);
if (Asttree.IsAttribute(nowNode))
{
this.isMatch = true; // for attribute
return(false);
}
this.curNode = nowNode;
this.curDepth++;
return(false);
}
// only for debug
#if DEBUG
public void PrintTree(StreamWriter msw)
{
foreach (ForwardAxis axis in fAxisArray)
{
msw.WriteLine("<Tree IsDss=\"{0}\" IsAttribute=\"{1}\">", axis.IsDss, axis.IsAttribute);
DoubleLinkAxis printaxis = axis.TopNode;
while (printaxis != null)
{
msw.WriteLine(" <node>");
msw.WriteLine(" <URN> {0} </URN>", printaxis.URN);
msw.WriteLine(" <Prefix> {0} </Prefix>", printaxis.Prefix);
msw.WriteLine(" <Name> {0} </Name>", printaxis.Name);
msw.WriteLine(" <NodeType> {0} </NodeType>", printaxis.Type);
msw.WriteLine(" <AxisType> {0} </AxisType>", printaxis.TypeOfAxis);
msw.WriteLine(" </node>");
printaxis = (DoubleLinkAxis)(printaxis.Input);
}
msw.WriteLine("</Tree>");
}
}
// "a/b/c" pointer from b move to a
// needn't change even tree structure changes
internal void MoveToParent(int depth, ForwardAxis parent)
{
// "a/b/c", trying to match b (current node), but meet the end of a, so move pointer to a
if (depth == this.curDepth - 1)
{
// really need to move the current node pointer to parent
// what i did here is for seperating the case of IsDss or only IsChild
// bcoz in the first case i need to expect "a" from random depth
// -1 means it doesn't expect some specific depth (referecing the dealing to -1 in movetochild method
// while in the second case i can't change the root depth which is 1.
if ((this.curNode.Input == parent.RootNode) && (parent.IsDss))
{
this.curNode = parent.RootNode;
this.rootDepth = this.curDepth = -1;
return;
}
else if (this.curNode.Input != null) // else cur-depth --, cur-node change
{
this.curNode = (DoubleLinkAxis)(this.curNode.Input);
this.curDepth--;
return;
}
else
{
return;
}
}
// "a/b/c", trying to match b (current node), but meet the end of x (another child of a)
// or maybe i matched, now move out the current node
// or move out after failing to match attribute
// the node i m next expecting is still the current node
else if (depth == this.curDepth) // after matched or [2] failed in matching attribute
{
if (this.isMatch)
{
this.isMatch = false;
}
}
return; // this node is still what i am expecting
// ignore
}
// don't return true or false, if it's invalid path, just throw exception during the process
// for whitespace thing, i will directly trim the tree built here...
public void CompileXPath(string xPath, bool isField, XmlNamespaceManager nsmgr)
{
if ((xPath == null) || (xPath == string.Empty))
{
throw new XmlSchemaException(Res.Sch_EmptyXPath);
}
// firstly i still need to have an ArrayList to store tree only...
// can't new ForwardAxis right away
string[] xpath = xPath.Split('|');
ArrayList AstArray = new ArrayList(xpath.Length);
this.fAxisArray = new ArrayList(xpath.Length);
// throw compile exceptions
// can i only new one builder here then run compile several times??
try {
foreach (string value in xpath)
{
// default ! isdesorself (no .//)
Axis ast = (Axis)(XPathParser.ParseXPathExpresion(value));
AstArray.Add(ast);
}
}
catch {
throw new XmlSchemaException(Res.Sch_ICXpathError, xPath);
}
Axis stepAst;
foreach (Axis ast in AstArray)
{
// Restricted form
// field can have an attribute:
// throw exceptions during casting
if ((stepAst = ast) == null)
{
throw new XmlSchemaException(Res.Sch_ICXpathError, xPath);
}
Axis top = stepAst;
// attribute will have namespace too
// field can have top attribute
if (IsAttribute(stepAst))
{
if (!isField)
{
throw new XmlSchemaException(Res.Sch_SelectorAttr, xPath);
}
else
{
SetURN(stepAst, nsmgr);
try {
stepAst = (Axis)(stepAst.Input);
}
catch {
throw new XmlSchemaException(Res.Sch_ICXpathError, xPath);
}
}
}
// field or selector
while ((stepAst != null) && (IsNameTest(stepAst) || IsSelf(stepAst)))
{
// trim tree "." node, if it's not the top one
if (IsSelf(stepAst) && (ast != stepAst))
{
top.Input = stepAst.Input;
}
else
{
top = stepAst;
// set the URN
if (IsNameTest(stepAst))
{
SetURN(stepAst, nsmgr);
}
}
try {
stepAst = (Axis)(stepAst.Input);
}
catch {
throw new XmlSchemaException(Res.Sch_ICXpathError, xPath);
}
}
// the rest part can only be .// or null
// trim the rest part, but need compile the rest part first
top.Input = null;
if (stepAst == null) // top "." and has other element beneath, trim this "." node too
{
if (IsSelf(ast) && (ast.Input != null))
{
this.fAxisArray.Add(new ForwardAxis(DoubleLinkAxis.ConvertTree((Axis)(ast.Input)), false));
}
else
{
this.fAxisArray.Add(new ForwardAxis(DoubleLinkAxis.ConvertTree(ast), false));
}
continue;
}
if (!IsDescendantOrSelf(stepAst))
{
throw new XmlSchemaException(Res.Sch_ICXpathError, xPath);
}
try {
stepAst = (Axis)(stepAst.Input);
}
catch {
throw new XmlSchemaException(Res.Sch_ICXpathError, xPath);
}
if ((stepAst == null) || (!IsSelf(stepAst)) || (stepAst.Input != null))
{
throw new XmlSchemaException(Res.Sch_ICXpathError, xPath);
}
// trim top "." if it's not the only node
if (IsSelf(ast) && (ast.Input != null))
{
this.fAxisArray.Add(new ForwardAxis(DoubleLinkAxis.ConvertTree((Axis)(ast.Input)), true));
}
else
{
this.fAxisArray.Add(new ForwardAxis(DoubleLinkAxis.ConvertTree(ast), true));
}
}
}
// constructor
internal AxisElement(DoubleLinkAxis node, int depth)
{
this.curNode = node;
this.rootDepth = this.curDepth = depth;
this.isMatch = false;
}