private static bool IsPrimaryExpr(XPathScanner scanner)
{
return(
scanner.Kind == XPathScanner.LexKind.String ||
scanner.Kind == XPathScanner.LexKind.Number ||
scanner.Kind == XPathScanner.LexKind.Dollar ||
scanner.Kind == XPathScanner.LexKind.LParens ||
scanner.Kind == XPathScanner.LexKind.Name && scanner.CanBeFunction && !IsNodeType(scanner)
);
}
private Axis.AxisType GetAxis(XPathScanner scaner)
{
Debug.Assert(scaner.Kind == XPathScanner.LexKind.Axe);
object axis = AxesTable[scaner.Name];
if (axis == null)
{
throw new XPathException(String.Format("'{0}' has an invalid token.", scanner.SourceText));
}
return((Axis.AxisType)axis);
}
private static bool IsNodeType(XPathScanner scaner)
{
return(
scaner.Prefix.Length == 0 && (
scaner.Name == "node" ||
scaner.Name == "text" ||
scaner.Name == "processing-instruction" ||
scaner.Name == "comment"
)
);
}
public static AstNode ParseXPathPattern(string xpathPattern)
{
XPathScanner scanner = new XPathScanner(xpathPattern);
XPathParser parser = new XPathParser(scanner);
AstNode result = parser.ParsePattern(null);
if (scanner.Kind != XPathScanner.LexKind.Eof)
{
throw new XPathException(string.Format("'{0}' has an invalid token.", scanner.SourceText));
}
return(result);
}
private XPathParser(XPathScanner scanner)
{
this.scanner = scanner;
}