/*
* LocationPath ::= RelativeLocationPath | '/' RelativeLocationPath? | '//' RelativeLocationPath
*/
private Node ParseLocationPath()
{
if (scanner.Kind == LexKind.Slash)
{
scanner.NextLex();
Node opnd = builder.Axis(XPathAxis.Root, XPathNodeType.All, null, null);
if (IsStep(scanner.Kind))
{
opnd = builder.JoinStep(opnd, ParseRelativeLocationPath());
}
return(opnd);
}
else if (scanner.Kind == LexKind.SlashSlash)
{
scanner.NextLex();
return(builder.JoinStep(
builder.Axis(XPathAxis.Root, XPathNodeType.All, null, null),
builder.JoinStep(
builder.Axis(XPathAxis.DescendantOrSelf, XPathNodeType.All, null, null),
ParseRelativeLocationPath()
)
));
}
else
{
return(ParseRelativeLocationPath());
}
}
internal static void InternalParseNodeTest(XPathScanner scanner, XPathAxis axis, out XPathNodeType nodeType, out string nodePrefix, out string nodeName)
{
switch (scanner.Kind)
{
case LexKind.Name:
if (scanner.CanBeFunction && IsNodeType(scanner))
{
nodePrefix = null;
nodeName = null;
switch (scanner.Name)
{
case "comment": nodeType = XPathNodeType.Comment; break;
case "text": nodeType = XPathNodeType.Text; break;
case "node": nodeType = XPathNodeType.All; break;
default:
Debug.Assert(scanner.Name == "processing-instruction");
nodeType = XPathNodeType.ProcessingInstruction;
break;
}
scanner.NextLex();
scanner.PassToken(LexKind.LParens);
if (nodeType == XPathNodeType.ProcessingInstruction)
{
if (scanner.Kind != LexKind.RParens) // 'processing-instruction' '(' Literal ')'
{
scanner.CheckToken(LexKind.String);
// It is not needed to set nodePrefix here, but for our current implementation
// comparing whole QNames is faster than comparing just local names
nodePrefix = string.Empty;
nodeName = scanner.StringValue;
scanner.NextLex();
}
}
scanner.PassToken(LexKind.RParens);
}
else
{
nodePrefix = scanner.Prefix;
nodeName = scanner.Name;
nodeType = PrincipalNodeType(axis);
scanner.NextLex();
if (nodeName == "*")
{
nodeName = null;
}
}
break;
case LexKind.Star:
nodePrefix = null;
nodeName = null;
nodeType = PrincipalNodeType(axis);
scanner.NextLex();
break;
default:
throw scanner.CreateException(Res.XPath_NodeTestExpected, scanner.RawValue);
}
}
