/*
* IdKeyPattern ::= 'id' '(' Literal ')' | 'key' '(' Literal ',' Literal ')'
*/
private QilNode ParseIdKeyPattern()
{
Debug.Assert(_scanner.CanBeFunction);
Debug.Assert(_scanner.Prefix.Length == 0);
Debug.Assert(_scanner.Name == "id" || _scanner.Name == "key");
List <QilNode> args = new List <QilNode>(2);
if (_scanner.Name == "id")
{
_scanner.NextLex();
_scanner.PassToken(LexKind.LParens);
_scanner.CheckToken(LexKind.String);
args.Add(_ptrnBuilder.String(_scanner.StringValue));
_scanner.NextLex();
_scanner.PassToken(LexKind.RParens);
return(_ptrnBuilder.Function("", "id", args));
}
else
{
_scanner.NextLex();
_scanner.PassToken(LexKind.LParens);
_scanner.CheckToken(LexKind.String);
args.Add(_ptrnBuilder.String(_scanner.StringValue));
_scanner.NextLex();
_scanner.PassToken(LexKind.Comma);
_scanner.CheckToken(LexKind.String);
args.Add(_ptrnBuilder.String(_scanner.StringValue));
_scanner.NextLex();
_scanner.PassToken(LexKind.RParens);
return(_ptrnBuilder.Function("", "key", args));
}
}
public QilNode Parse(XPathScanner scanner, IPatternBuilder ptrnBuilder)
{
Debug.Assert(_scanner == null && _ptrnBuilder == null);
Debug.Assert(scanner != null && ptrnBuilder != null);
QilNode result = null;
ptrnBuilder.StartBuild();
try
{
_scanner = scanner;
_ptrnBuilder = ptrnBuilder;
result = this.ParsePattern();
_scanner.CheckToken(LexKind.Eof);
}
finally
{
result = ptrnBuilder.EndBuild(result);
#if DEBUG
this._ptrnBuilder = null;
this._scanner = null;
#endif
}
return(result);
}