/*
* BNF:
* <qualifier expression> ::=
* <factor>[.<qualifier expression>]
*/
protected Expression QualifierExpression(Lexer lexer)
{
Expression localExpression = Factor(lexer);
if (lexer.PeekTokenSymbol(1) == Keywords.Qualifier)
{
lexer.NextToken();
QualifierExpression qualifierExpression = new QualifierExpression();
qualifierExpression.SetPosition(lexer);
qualifierExpression.LeftExpression = localExpression;
qualifierExpression.RightExpression = QualifierExpression(lexer);
return(qualifierExpression);
}
return(localExpression);
}
/*
* BNF:
* <qualified factor> ::=
* (([.]<identifier>) | <qualifier expression>){"["<expression>"]"[.<qualifier expression>]}
*/
protected Expression QualifiedFactor(Lexer lexer)
{
Expression localExpression;
if (lexer.PeekTokenSymbol(1) == Keywords.Qualifier)
{
lexer.NextToken();
localExpression = new IdentifierExpression(String.Format("{0}{1}", Keywords.Qualifier, Identifier(lexer)));
}
else
{
localExpression = QualifierExpression(lexer);
}
while (lexer.PeekTokenSymbol(1) == Keywords.BeginIndexer)
{
IndexerExpression indexerExpression = new IndexerExpression();
indexerExpression.SetPosition(lexer);
indexerExpression.Expression = localExpression;
lexer.NextToken();
indexerExpression.Indexer = Expression(lexer);
lexer.NextToken().CheckSymbol(Keywords.EndIndexer);
localExpression = indexerExpression;
if (lexer.PeekTokenSymbol(1) == Keywords.Qualifier)
{
lexer.NextToken();
QualifierExpression qualifierExpression = new QualifierExpression();
qualifierExpression.SetPosition(lexer);
qualifierExpression.LeftExpression = localExpression;
qualifierExpression.RightExpression = QualifierExpression(lexer);
localExpression = qualifierExpression;
}
}
return(localExpression);
}
