private Query ProcessNode(AstNode root, Flags flags, out Props props)
{
if (++parseDepth > MaxParseDepth)
{
throw XPathException.Create(Res.Xp_QueryTooComplex);
}
Debug.Assert(root != null, "root != null");
Query result = null;
props = Props.None;
switch (root.Type)
{
case AstNode.AstType.Axis:
result = ProcessAxis((Axis)root, flags, out props);
break;
case AstNode.AstType.Operator:
result = ProcessOperator((Operator)root, out props);
break;
case AstNode.AstType.Filter:
result = ProcessFilter((Filter)root, flags, out props);
break;
case AstNode.AstType.ConstantOperand:
result = new OperandQuery(((Operand)root).OperandValue);
break;
case AstNode.AstType.Variable:
result = ProcessVariable((Variable)root);
break;
case AstNode.AstType.Function:
result = ProcessFunction((Function)root, out props);
break;
case AstNode.AstType.Group:
result = new GroupQuery(ProcessNode(((Group)root).GroupNode, Flags.None, out props));
break;
case AstNode.AstType.Root:
result = new AbsoluteQuery();
break;
default:
Debug.Assert(false, "Unknown QueryType encountered!!");
break;
}
--parseDepth;
return(result);
}
public override XPathNavigator MatchNode(XPathNavigator current)
{
XPathNavigator context;
if (current == null)
{
return(null);
}
context = qyInput.MatchNode(current);
if (context != null)
{
// In this switch we process some special case in wich we can calculate predicate faster then in generic case
switch (_cond.StaticType)
{
case XPathResultType.Number:
OperandQuery operand = _cond as OperandQuery;
if (operand != null)
{
double val = (double)operand.val;
ChildrenQuery childrenQuery = qyInput as ChildrenQuery;
if (childrenQuery != null)
{ // foo[2], but not foo[expr][2]
XPathNavigator result = current.Clone();
result.MoveToParent();
int i = 0;
result.MoveToFirstChild();
do
{
if (childrenQuery.matches(result))
{
i++;
if (current.IsSamePosition(result))
{
return(val == i ? context : null);
}
}
} while (result.MoveToNext());
return(null);
}
AttributeQuery attributeQuery = qyInput as AttributeQuery;
if (attributeQuery != null)
{ // @foo[3], but not @foo[expr][2]
XPathNavigator result = current.Clone();
result.MoveToParent();
int i = 0;
result.MoveToFirstAttribute();
do
{
if (attributeQuery.matches(result))
{
i++;
if (current.IsSamePosition(result))
{
return(val == i ? context : null);
}
}
} while (result.MoveToNextAttribute());
return(null);
}
}
break;
case XPathResultType.NodeSet:
_cond.Evaluate(new XPathSingletonIterator(current, /*moved:*/ true));
return((_cond.Advance() != null) ? context : null);
case XPathResultType.Boolean:
if (_noPosition)
{
return(((bool)_cond.Evaluate(new XPathSingletonIterator(current, /*moved:*/ true))) ? context : null);
}
break;
case XPathResultType.String:
if (_noPosition)
{
return((((string)_cond.Evaluate(new XPathSingletonIterator(current, /*moved:*/ true))).Length != 0) ? context : null);
}
break;
case XPathResultType_Navigator:
return(context);
default:
return(null);
}
/* Generic case */
{
Evaluate(new XPathSingletonIterator(context, /*moved:*/ true));
XPathNavigator result;
while ((result = Advance()) != null)
{
if (result.IsSamePosition(current))
{
return(context);
}
}
}
}
return(null);
}
public override XPathNavigator MatchNode(XPathNavigator current)
{
XPathNavigator navigator;
XPathNavigator navigator4;
if (current != null)
{
navigator = base.qyInput.MatchNode(current);
if (navigator == null)
{
goto Label_01B9;
}
switch (this.cond.StaticType)
{
case XPathResultType.Number:
{
OperandQuery cond = this.cond as OperandQuery;
if (cond != null)
{
double val = (double)cond.val;
ChildrenQuery qyInput = base.qyInput as ChildrenQuery;
if (qyInput != null)
{
XPathNavigator e = current.Clone();
e.MoveToParent();
int num2 = 0;
e.MoveToFirstChild();
do
{
if (qyInput.matches(e))
{
num2++;
if (current.IsSamePosition(e))
{
if (val != num2)
{
return(null);
}
return(navigator);
}
}
}while (e.MoveToNext());
return(null);
}
AttributeQuery query3 = base.qyInput as AttributeQuery;
if (query3 != null)
{
XPathNavigator navigator3 = current.Clone();
navigator3.MoveToParent();
int num3 = 0;
navigator3.MoveToFirstAttribute();
do
{
if (query3.matches(navigator3))
{
num3++;
if (current.IsSamePosition(navigator3))
{
if (val != num3)
{
return(null);
}
return(navigator);
}
}
}while (navigator3.MoveToNextAttribute());
return(null);
}
}
goto Label_0192;
}
case XPathResultType.String:
if (!this.noPosition)
{
goto Label_0192;
}
if (((string)this.cond.Evaluate(new XPathSingletonIterator(current, true))).Length != 0)
{
return(navigator);
}
return(null);
case XPathResultType.Boolean:
if (!this.noPosition)
{
goto Label_0192;
}
if ((bool)this.cond.Evaluate(new XPathSingletonIterator(current, true)))
{
return(navigator);
}
return(null);
case XPathResultType.NodeSet:
this.cond.Evaluate(new XPathSingletonIterator(current, true));
if (this.cond.Advance() != null)
{
return(navigator);
}
return(null);
case ((XPathResultType)4):
return(navigator);
}
}
return(null);
Label_0192:
this.Evaluate(new XPathSingletonIterator(navigator, true));
while ((navigator4 = this.Advance()) != null)
{
if (navigator4.IsSamePosition(current))
{
return(navigator);
}
}
Label_01B9:
return(null);
}