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//
// System.Xml.XPath.BaseIterator
//
// Author:
// Piers Haken (piersh@friskit.com)
//
// (C) 2002 Piers Haken
//
using System;
using System.Collections;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Xsl;
namespace System.Xml.XPath
{
internal abstract class BaseIterator : XPathNodeIterator
{
private XmlNamespaceManager _nsm;
internal BaseIterator (BaseIterator other)
{
_nsm = other._nsm;
}
internal BaseIterator (XmlNamespaceManager nsm)
{
_nsm = nsm;
}
public XmlNamespaceManager NamespaceManager
{
get { return _nsm; }
set { _nsm = value; }
}
public virtual bool ReverseAxis {
get { return false; }
}
public virtual int ComparablePosition {
get {
if (ReverseAxis) {
int diff = Count - CurrentPosition + 1;
return diff < 1 ? 1 : diff;
}
else
return CurrentPosition;
}
}
public override string ToString ()
{
if (Current != null)
return Current.NodeType.ToString () + "[" + CurrentPosition + "] : " + Current.Name + " = " + Current.Value;
else
return this.GetType().ToString () + "[" + CurrentPosition + "]";
}
}
internal class MergedIterator : BaseIterator
{
protected ArrayList _iters = new ArrayList ();
protected int _pos;
protected int _index;
public MergedIterator (BaseIterator iter ) : base (iter) {}
protected MergedIterator (MergedIterator other) : base (other)
{
foreach (XPathNodeIterator iter in other._iters)
_iters.Add (iter.Clone ());
_pos = other._pos;
_index = other._index;
}
public override XPathNodeIterator Clone () { return new MergedIterator (this); }
public void Add (BaseIterator iter)
{
_iters.Add (iter);
}
public override bool MoveNext ()
{
while (_index < _iters.Count)
{
BaseIterator iter = (BaseIterator) _iters [_index];
if (iter.MoveNext ())
{
_pos ++;
return true;
}
_index ++;
}
return false;
}
public override XPathNavigator Current
{
get
{
if (_index >= _iters.Count)
return null;
BaseIterator iter = (BaseIterator) _iters [_index];
return iter.Current;
}
}
public override int CurrentPosition { get { return _pos; }}
}
internal abstract class SimpleIterator : BaseIterator
{
protected readonly XPathNavigator _nav;
protected int _pos;
public SimpleIterator (BaseIterator iter) : base (iter)
{
_nav = iter.Current.Clone ();
}
protected SimpleIterator (SimpleIterator other) : base (other)
{
_nav = other._nav.Clone ();
_pos = other._pos;
}
public SimpleIterator (XPathNavigator nav, XmlNamespaceManager nsm) : base (nsm)
{
_nav = nav.Clone ();
}
public override XPathNavigator Current { get { return _nav; }}
public override int CurrentPosition { get { return _pos; }}
}
internal class SelfIterator : SimpleIterator
{
public SelfIterator (BaseIterator iter) : base (iter) {}
public SelfIterator (XPathNavigator nav, XmlNamespaceManager nsm) : base (nav, nsm) {}
protected SelfIterator (SelfIterator other) : base (other) {}
public override XPathNodeIterator Clone () { return new SelfIterator (this); }
public override bool MoveNext ()
{
if (_pos == 0)
{
_pos = 1;
return true;
}
return false;
}
}
internal class NullIterator : SelfIterator
{
public NullIterator (BaseIterator iter) : base (iter) {}
public NullIterator (XPathNavigator nav) : this (nav, null) {}
public NullIterator (XPathNavigator nav, XmlNamespaceManager nsm) : base (nav, nsm) {}
protected NullIterator (NullIterator other) : base (other) {}
public override XPathNodeIterator Clone () { return new NullIterator (this); }
public override bool MoveNext ()
{
return false;
}
}
internal class ParentIterator : SimpleIterator
{
public ParentIterator (BaseIterator iter) : base (iter) {}
protected ParentIterator (ParentIterator other) : base (other) {}
public ParentIterator (XPathNavigator nav, XmlNamespaceManager nsm) : base (nav, nsm) {}
public override XPathNodeIterator Clone () { return new ParentIterator (this); }
public override bool MoveNext ()
{
if (_pos == 0 && _nav.MoveToParent ())
{
_pos = 1;
return true;
}
return false;
}
}
internal class ChildIterator : SimpleIterator
{
public ChildIterator (BaseIterator iter) : base (iter) {}
protected ChildIterator (ChildIterator other) : base (other) {}
public override XPathNodeIterator Clone () { return new ChildIterator (this); }
public override bool MoveNext ()
{
bool fSuccess = (_pos == 0) ? _nav.MoveToFirstChild () : _nav.MoveToNext ();
if (fSuccess)
_pos ++;
return fSuccess;
}
}
internal class FollowingSiblingIterator : SimpleIterator
{
public FollowingSiblingIterator (BaseIterator iter) : base (iter) {}
protected FollowingSiblingIterator (FollowingSiblingIterator other) : base (other) {}
public override XPathNodeIterator Clone () { return new FollowingSiblingIterator (this); }
public override bool MoveNext ()
{
if (_nav.MoveToNext ())
{
_pos ++;
return true;
}
return false;
}
}
internal class PrecedingSiblingIterator : SimpleIterator
{
bool finished;
bool started;
XPathNavigator startPosition;
public PrecedingSiblingIterator (BaseIterator iter) : base (iter)
{
startPosition = iter.Current.Clone ();
}
protected PrecedingSiblingIterator (PrecedingSiblingIterator other) : base (other)
{
startPosition = other.startPosition;
started = other.started;
finished = other.finished;
}
public override XPathNodeIterator Clone () { return new PrecedingSiblingIterator (this); }
public override bool MoveNext ()
{
if (finished)
return false;
if (!started) {
started = true;
_nav.MoveToFirst ();
if (_nav.ComparePosition (startPosition) == XmlNodeOrder.Same) {
_pos++;
return true;
}
} else {
if (!_nav.MoveToNext ()) {
finished = true;
return false;
}
}
if (_nav.ComparePosition (startPosition) != XmlNodeOrder.Before) {
// Note that if _nav contains only 1 node, it won't be Same.
finished = true;
return false;
} else {
_pos ++;
return true;
}
}
public override bool ReverseAxis {
get { return true; }
}
}
internal class AncestorIterator : SimpleIterator
{
bool finished;
bool started;
ArrayList positions = new ArrayList ();
XPathNavigator startPosition;
int nextDepth;
public AncestorIterator (BaseIterator iter) : base (iter)
{
startPosition = iter.Current.Clone ();
}
protected AncestorIterator (AncestorIterator other) : base (other)
{
startPosition = other.startPosition;
started = other.started;
finished = other.finished;
positions = other.positions;
nextDepth = other.nextDepth;
}
public override XPathNodeIterator Clone () { return new AncestorIterator (this); }
public override bool MoveNext ()
{
if (finished)
return false;
if (!started) {
started = true;
XPathNavigator ancestors = startPosition.Clone ();
ancestors.MoveToParent ();
_nav.MoveToParent ();
do {
int i = 0;
_nav.MoveToFirst ();
while (_nav.ComparePosition (ancestors) == XmlNodeOrder.Before) {
_nav.MoveToNext ();
i++;
}
positions.Add (i);
ancestors.MoveToParent ();
_nav.MoveToParent ();
} while (ancestors.NodeType != XPathNodeType.Root);
positions.Reverse ();
}
if (nextDepth < positions.Count) {
int thisTimePos = (int) positions [nextDepth];
_nav.MoveToFirstChild ();
for (int i = 0; i < thisTimePos; i++)
_nav.MoveToNext ();
nextDepth++;
_pos++;
return true;
}
finished = true;
return false;
}
public override bool ReverseAxis {
get { return true; }
}
}
internal class AncestorOrSelfIterator : SimpleIterator
{
bool finished;
bool started;
ArrayList positions = new ArrayList ();
XPathNavigator startPosition;
int nextDepth;
public AncestorOrSelfIterator (BaseIterator iter) : base (iter)
{
startPosition = iter.Current.Clone ();
}
protected AncestorOrSelfIterator (AncestorOrSelfIterator other) : base (other)
{
startPosition = other.startPosition;
started = other.started;
finished = other.finished;
positions = other.positions;
nextDepth = other.nextDepth;
}
public override XPathNodeIterator Clone () { return new AncestorOrSelfIterator (this); }
public override bool MoveNext ()
{
if (finished)
return false;
if (!started) {
started = true;
XPathNavigator ancestors = startPosition.Clone ();
do {
int i = 0;
_nav.MoveToFirst ();
while (_nav.ComparePosition (ancestors) == XmlNodeOrder.Before) {
_nav.MoveToNext ();
i++;
}
positions.Add (i);
ancestors.MoveToParent ();
_nav.MoveToParent ();
} while (ancestors.NodeType != XPathNodeType.Root);
positions.Reverse ();
}
if (nextDepth < positions.Count) {
int thisTimePos = (int) positions [nextDepth];
_nav.MoveToFirstChild ();
for (int i = 0; i < thisTimePos; i++)
_nav.MoveToNext ();
nextDepth++;
_pos++;
return true;
}
finished = true;
return false;
}
public override bool ReverseAxis {
get { return true; }
}
}
internal class DescendantIterator : SimpleIterator
{
protected int _depth;
private bool _finished;
public DescendantIterator (BaseIterator iter) : base (iter) {}
protected DescendantIterator (DescendantIterator other) : base (other)
{
_depth = other._depth;
}
public override XPathNodeIterator Clone () { return new DescendantIterator (this); }
[MonoTODO]
public override bool MoveNext ()
{
if (_finished)
return false;
if (_nav.MoveToFirstChild ())
{
_depth ++;
_pos ++;
return true;
}
while (_depth != 0)
{
if (_nav.MoveToNext ())
{
_pos ++;
return true;
}
if (!_nav.MoveToParent ()) // should NEVER fail!
throw new XPathException ("unexpected depth"); // TODO: better message
_depth --;
}
_finished = true;
return false;
}
}
internal class DescendantOrSelfIterator : SimpleIterator
{
protected int _depth;
private bool _finished;
public DescendantOrSelfIterator (BaseIterator iter) : base (iter) {}
protected DescendantOrSelfIterator (DescendantOrSelfIterator other) : base (other)
{
_depth = other._depth;
}
public override XPathNodeIterator Clone () { return new DescendantOrSelfIterator (this); }
[MonoTODO]
public override bool MoveNext ()
{
if (_finished)
return false;
if (_pos == 0)
{
// self
_pos ++;
return true;
}
if (_nav.MoveToFirstChild ())
{
_depth ++;
_pos ++;
return true;
}
while (_depth != 0)
{
if (_nav.MoveToNext ())
{
_pos ++;
return true;
}
if (!_nav.MoveToParent ()) // should NEVER fail!
throw new XPathException ("unexpected depth"); // TODO: better message
_depth --;
}
_finished = true;
return false;
}
}
internal class FollowingIterator : SimpleIterator
{
private bool _finished = false;
public FollowingIterator (BaseIterator iter) : base (iter) {}
protected FollowingIterator (FollowingIterator other) : base (other) {}
public override XPathNodeIterator Clone () { return new FollowingIterator (this); }
public override bool MoveNext ()
{
if (_finished)
return false;
if (_pos == 0)
{
if (_nav.MoveToNext ())
{
_pos ++;
return true;
}
}
else
{
if (_nav.MoveToFirstChild ())
{
_pos ++;
return true;
}
do
{
if (_nav.MoveToNext ())
{
_pos ++;
return true;
}
}
while (_nav.MoveToParent ());
}
_finished = true;
return false;
}
}
internal class PrecedingIterator : SimpleIterator
{
bool finished;
bool started;
XPathNavigator startPosition;
public PrecedingIterator (BaseIterator iter) : base (iter)
{
startPosition = iter.Current.Clone ();
}
protected PrecedingIterator (PrecedingIterator other) : base (other)
{
startPosition = other.startPosition;
started = other.started;
finished = other.finished;
}
public override XPathNodeIterator Clone () { return new PrecedingIterator (this); }
public override bool MoveNext ()
{
if (finished)
return false;
if (!started) {
started = true;
_nav.MoveToRoot ();
_nav.MoveToFirstChild ();
if (_nav.ComparePosition (startPosition) == XmlNodeOrder.Same) {
_pos++;
return true;
}
} else {
while (!_nav.MoveToFirstChild ()) {
while (!_nav.MoveToNext ())
_nav.MoveToParent (); // Should not finish, at least before startPosition.
break;
}
}
if (_nav.ComparePosition (startPosition) != XmlNodeOrder.Before) {
// Note that if _nav contains only 1 node, it won't be Same.
finished = true;
return false;
} else {
_pos ++;
return true;
}
}
public override bool ReverseAxis {
get { return true; }
}
}
internal class NamespaceIterator : SimpleIterator
{
public NamespaceIterator (BaseIterator iter) : base (iter) {}
protected NamespaceIterator (NamespaceIterator other) : base (other) {}
public override XPathNodeIterator Clone () { return new NamespaceIterator (this); }
public override bool MoveNext ()
{
if (_pos == 0)
{
if (_nav.MoveToFirstNamespace ())
{
_pos ++;
return true;
}
}
else if (_nav.MoveToNextNamespace ())
{
_pos ++;
return true;
}
return false;
}
}
internal class AttributeIterator : SimpleIterator
{
public AttributeIterator (BaseIterator iter) : base (iter) {}
protected AttributeIterator (AttributeIterator other) : base (other) {}
public override XPathNodeIterator Clone () { return new AttributeIterator (this); }
public override bool MoveNext ()
{
if (_pos == 0)
{
if (_nav.MoveToFirstAttribute ())
{
_pos += 1;
return true;
}
}
else if (_nav.MoveToNextAttribute ())
{
_pos ++;
return true;
}
return false;
}
}
internal class AxisIterator : BaseIterator
{
protected SimpleIterator _iter;
protected NodeTest _test;
protected int _pos;
string name, ns;
XPathNodeType matchType;
public AxisIterator (SimpleIterator iter, NodeTest test) : base (iter)
{
_iter = iter;
_test = test;
test.GetInfo (out name, out ns, out matchType, NamespaceManager);
if (name != null)
name = Current.NameTable.Add (name);
if (ns != null)
ns = Current.NameTable.Add (ns);
}
protected AxisIterator (AxisIterator other) : base (other)
{
_iter = (SimpleIterator) other._iter.Clone ();
_test = other._test;
_pos = other._pos;
name = other.name;
ns = other.ns;
matchType = other.matchType;
}
public override XPathNodeIterator Clone () { return new AxisIterator (this); }
public override bool MoveNext ()
{
while (_iter.MoveNext ())
{
if (_test.Match (NamespaceManager, Current))
{
_pos ++;
return true;
}
}
return false;
}
public override XPathNavigator Current { get { return _iter.Current; }}
public override int CurrentPosition { get { return _pos; }}
//public override int ComparablePosition { get { return _iter.ComparablePosition; } }
bool Match ()
{
if (Current.NodeType != matchType && matchType != XPathNodeType.All)
return false;
if (ns == null)
return name == null || (object)name == (object)Current.LocalName;
else
return (object)ns == (object)Current.NamespaceURI &&
(name == null || (object)name == (object)Current.LocalName);
}
}
#if false
internal class SlashIterator : BaseIterator
{
protected BaseIterator _iterLeft;
protected BaseIterator _iterRight;
protected NodeSet _expr;
protected int _pos;
public SlashIterator (BaseIterator iter, NodeSet expr) : base (iter)
{
_iterLeft = iter;
_expr = expr;
}
protected SlashIterator (SlashIterator other) : base (other)
{
_iterLeft = (BaseIterator) other._iterLeft.Clone ();
if (other._iterRight != null)
_iterRight = (BaseIterator) other._iterRight.Clone ();
_expr = other._expr;
_pos = other._pos;
}
public override XPathNodeIterator Clone () { return new SlashIterator (this); }
public override bool MoveNext ()
{
while (_iterRight == null || !_iterRight.MoveNext ())
{
if (!_iterLeft.MoveNext ())
return false;
_iterRight = _expr.EvaluateNodeSet (_iterLeft);
}
_pos ++;
return true;
}
public override XPathNavigator Current {
get {
if (_iterRight == null) return null;
return _iterRight.Current;
}
}
public override int CurrentPosition { get { return _pos; }}
}
#else
internal class SlashIterator : BaseIterator
{
protected BaseIterator _iterLeft;
protected BaseIterator _iterRight;
protected NodeSet _expr;
protected int _pos;
Stack _iterStack;
bool _finished;
BaseIterator _nextIterRight;
public SlashIterator (BaseIterator iter, NodeSet expr) : base (iter)
{
_iterLeft = iter;
_expr = expr;
}
protected SlashIterator (SlashIterator other) : base (other)
{
_iterLeft = (BaseIterator) other._iterLeft.Clone ();
if (other._iterRight != null)
_iterRight = (BaseIterator) other._iterRight.Clone ();
_expr = other._expr;
_pos = other._pos;
if (other._iterStack != null)
_iterStack = other._iterStack.Clone () as Stack;
_finished = other._finished;
_nextIterRight = other._nextIterRight;
}
public override XPathNodeIterator Clone () { return new SlashIterator (this); }
public override bool MoveNext ()
{
if (_finished)
return false;
if (_iterRight == null) {
if (!_iterLeft.MoveNext ())
return false;
_iterRight = _expr.EvaluateNodeSet (_iterLeft);
_iterStack = new Stack ();
}
while (true) {
while (!_iterRight.MoveNext ()) {
if (_iterStack.Count > 0) {
_iterRight = _iterStack.Pop () as BaseIterator;
break;
} else if (_nextIterRight != null) {
_iterRight = _nextIterRight;
_nextIterRight = null;
break;
} else if (!_iterLeft.MoveNext ()) {
_finished = true;
return false;
}
else
_iterRight = _expr.EvaluateNodeSet (_iterLeft);
}
bool loop = true;
while (loop) {
loop = false;
if (_nextIterRight == null) {
bool noMoreNext = false;
while (_nextIterRight == null || !_nextIterRight.MoveNext ()) {
if(_iterLeft.MoveNext ())
_nextIterRight = _expr.EvaluateNodeSet (_iterLeft);
else {
noMoreNext = true;
break;
}
}
if (noMoreNext)
_nextIterRight = null; // FIXME: More efficient code. Maybe making noMoreNext class scope would be better.
}
if (_nextIterRight != null) {
switch (_iterRight.Current.ComparePosition (_nextIterRight.Current)) {
case XmlNodeOrder.After:
_iterStack.Push (_iterRight);
_iterRight = _nextIterRight;
_nextIterRight = null;
break;
case XmlNodeOrder.Same:
if (!_nextIterRight.MoveNext ())
_nextIterRight = null;
loop = true;
break;
}
}
}
_pos ++;
return true;
}
}
public override XPathNavigator Current {
get {
if (_iterRight == null) return null;
return _iterRight.Current;
}
}
public override int CurrentPosition { get { return _pos; }}
}
#endif
internal class PredicateIterator : BaseIterator
{
protected BaseIterator _iter;
protected Expression _pred;
protected int _pos;
protected XPathResultType resType;
public PredicateIterator (BaseIterator iter, Expression pred) : base (iter)
{
_iter = iter;
_pred = pred;
resType = pred.GetReturnType (iter);
}
protected PredicateIterator (PredicateIterator other) : base (other)
{
_iter = (BaseIterator) other._iter.Clone ();
_pred = other._pred;
_pos = other._pos;
resType = other.resType;
}
public override XPathNodeIterator Clone () { return new PredicateIterator (this); }
public override bool MoveNext ()
{
while (_iter.MoveNext ())
{
bool fTrue = true;
switch (resType) {
case XPathResultType.Number:
if (_pred.EvaluateNumber (_iter) != _iter.ComparablePosition)
continue;
break;
case XPathResultType.Any: {
object result = _pred.Evaluate (_iter);
if (result is double)
{
if ((double) result != _iter.ComparablePosition)
continue;
}
else if (!XPathFunctions.ToBoolean (result))
continue;
}
break;
default:
if (!_pred.EvaluateBoolean (_iter))
continue;
break;
}
_pos ++;
return true;
}
return false;
}
public override XPathNavigator Current { get { return _iter.Current; }}
public override int CurrentPosition { get { return _pos; }}
}
internal class EnumeratorIterator : BaseIterator
{
protected IEnumerator _enum;
protected int _pos;
public EnumeratorIterator (BaseIterator iter, IEnumerator enumerator) : base (iter)
{
_enum = enumerator;
}
public EnumeratorIterator (IEnumerator enumerator, XmlNamespaceManager nsm) : base (nsm)
{
_enum = enumerator;
}
protected EnumeratorIterator (EnumeratorIterator other) : base (other)
{
_enum = other._enum;
_pos = other._pos;
}
public override XPathNodeIterator Clone () { return new EnumeratorIterator (this); }
public override bool MoveNext ()
{
if (!_enum.MoveNext ())
return false;
_pos++;
return true;
}
public override XPathNavigator Current { get { return (XPathNavigator) _enum.Current; }}
public override int CurrentPosition { get { return _pos; }}
}
internal class UnionIterator : BaseIterator
{
protected BaseIterator _left, _right;
private int _pos;
private bool keepLeft;
private bool keepRight;
private bool useRight;
public UnionIterator (BaseIterator iter, BaseIterator left, BaseIterator right) : base (iter)
{
_left = left;
_right = right;
}
protected UnionIterator (UnionIterator other) : base (other)
{
_left = other._left;
_right = other._right;
_pos = other._pos;
}
public override XPathNodeIterator Clone () { return new UnionIterator (this); }
public override bool MoveNext ()
{
if (!keepLeft)
keepLeft = _left.MoveNext ();
if (!keepRight)
keepRight = _right.MoveNext ();
if (!keepLeft && !keepRight)
return false;
_pos ++;
if (!keepRight) {
keepLeft = useRight = false;
return true;
} else if (!keepLeft) {
keepRight = false;
useRight = true;
return true;
}
switch (_left.Current.ComparePosition (_right.Current)) {
case XmlNodeOrder.Same:
// consume both. i.e. don't output duplicate result.
keepLeft = keepRight = false;
useRight = true;
return true;
case XmlNodeOrder.Before:
keepLeft = useRight = false;
return true;
case XmlNodeOrder.After:
keepRight = false;
useRight = true;
return true;
default:
throw new InvalidOperationException ("Should not happen.");
}
}
public override XPathNavigator Current
{
get
{
if (_pos == 0)
return null;
if (useRight)
return _right.Current;
else
return _left.Current;
}
}
public override int CurrentPosition { get { return _pos; }}
}
}
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