/*
* StepPattern ::= ChildOrAttributeAxisSpecifier NodeTest Predicate*
* ChildOrAttributeAxisSpecifier ::= @ ? | ('child' | 'attribute') '::'
*/
private QilNode ParseStepPattern()
{
QilNode opnd;
XPathAxis axis;
switch (scanner.Kind)
{
case LexKind.Dot:
case LexKind.DotDot:
throw scanner.CreateException(Res.XPath_InvalidAxisInPattern);
case LexKind.At: //>> '@'
axis = XPathAxis.Attribute;
scanner.NextLex();
break;
case LexKind.Axis: //>> AxisName '::'
axis = XPathParser.GetAxis(scanner.Name, scanner);
if (axis != XPathAxis.Child && axis != XPathAxis.Attribute)
{
throw scanner.CreateException(Res.XPath_InvalidAxisInPattern);
}
scanner.NextLex();
break;
case LexKind.Name:
case LexKind.Star:
// NodeTest must start with Name or '*'
axis = XPathAxis.Child;
break;
default:
throw scanner.CreateException(Res.XPath_UnexpectedToken, scanner.RawValue);
}
XPathNodeType nodeType;
string nodePrefix, nodeName;
XPathParser.InternalParseNodeTest(scanner, axis, out nodeType, out nodePrefix, out nodeName);
opnd = ptrnBuilder.Axis(axis, nodeType, nodePrefix, nodeName);
while (scanner.Kind == LexKind.LBracket)
{
opnd = ptrnBuilder.Predicate(opnd, ParsePredicate(opnd), /*reverseStep:*/ false);
}
return(opnd);
}
/*
* StepPattern ::= ChildOrAttributeAxisSpecifier NodeTest Predicate*
* ChildOrAttributeAxisSpecifier ::= @ ? | ('child' | 'attribute') '::'
*/
private QilNode ParseStepPattern()
{
QilNode opnd;
XPathAxis axis;
switch (_scanner.Kind)
{
case LexKind.Dot:
case LexKind.DotDot:
throw _scanner.CreateException(SR.XPath_InvalidAxisInPattern);
case LexKind.At:
axis = XPathAxis.Attribute;
_scanner.NextLex();
break;
case LexKind.Axis:
axis = _scanner.Axis;
if (axis != XPathAxis.Child && axis != XPathAxis.Attribute)
{
throw _scanner.CreateException(SR.XPath_InvalidAxisInPattern);
}
_scanner.NextLex(); // Skip '::'
_scanner.NextLex();
break;
case LexKind.Name:
case LexKind.Star:
// NodeTest must start with Name or '*'
axis = XPathAxis.Child;
break;
default:
throw _scanner.CreateException(SR.XPath_UnexpectedToken, _scanner.RawValue);
}
XPathNodeType nodeType;
string nodePrefix, nodeName;
XPathParser.InternalParseNodeTest(_scanner, axis, out nodeType, out nodePrefix, out nodeName);
opnd = _ptrnBuilder.Axis(axis, nodeType, nodePrefix, nodeName);
XPathPatternBuilder xpathPatternBuilder = _ptrnBuilder as XPathPatternBuilder;
if (xpathPatternBuilder != null)
{
//for XPathPatternBuilder, get all predicates and then build them
List <QilNode> predicates = new List <QilNode>();
while (_scanner.Kind == LexKind.LBracket)
{
predicates.Add(ParsePredicate(opnd));
}
if (predicates.Count > 0)
{
opnd = xpathPatternBuilder.BuildPredicates(opnd, predicates);
}
}
else
{
while (_scanner.Kind == LexKind.LBracket)
{
opnd = _ptrnBuilder.Predicate(opnd, ParsePredicate(opnd), /*reverseStep:*/ false);
}
}
return(opnd);
}