public TSQLSetOperatorClause Parse(ITSQLTokenizer tokenizer)
{
TSQLSetOperatorClause set = null;
if (tokenizer.Current.IsKeyword(TSQLKeywords.UNION))
{
set = new TSQLUnionClause();
set.Tokens.Add(tokenizer.Current);
if (tokenizer.MoveNext() &&
tokenizer.Current.IsKeyword(TSQLKeywords.ALL))
{
set.Tokens.Add(tokenizer.Current);
tokenizer.MoveNext();
}
}
else if (tokenizer.Current.IsKeyword(TSQLKeywords.EXCEPT))
{
set = new TSQLExceptClause();
set.Tokens.Add(tokenizer.Current);
tokenizer.MoveNext();
}
else if (tokenizer.Current.IsKeyword(TSQLKeywords.INTERSECT))
{
set = new TSQLIntersectClause();
set.Tokens.Add(tokenizer.Current);
tokenizer.MoveNext();
}
TSQLSelectStatement select = new TSQLLimitedSelectStatementParser(tokenizer).Parse();
set.Select = select;
set.Tokens.AddRange(select.Tokens);
return(set);
}
public TSQLSetOperatorClause Parse(ITSQLTokenizer tokenizer)
{
TSQLSetOperatorClause set = null;
if (tokenizer.Current.IsKeyword(TSQLKeywords.UNION))
{
set = new TSQLUnionClause();
set.Tokens.Add(tokenizer.Current);
if (tokenizer.MoveNext() &&
tokenizer.Current.IsKeyword(TSQLKeywords.ALL))
{
set.Tokens.Add(tokenizer.Current);
tokenizer.MoveNext();
}
}
else if (tokenizer.Current.IsKeyword(TSQLKeywords.EXCEPT))
{
set = new TSQLExceptClause();
set.Tokens.Add(tokenizer.Current);
tokenizer.MoveNext();
}
else if (tokenizer.Current.IsKeyword(TSQLKeywords.INTERSECT))
{
set = new TSQLIntersectClause();
set.Tokens.Add(tokenizer.Current);
tokenizer.MoveNext();
}
int level = 0;
while (tokenizer.Current.IsCharacter(TSQLCharacters.OpenParentheses))
{
set.Tokens.Add(tokenizer.Current);
level++;
tokenizer.MoveNext();
}
TSQLSelectStatement select = new TSQLLimitedSelectStatementParser(tokenizer).Parse();
set.Select = select;
set.Tokens.AddRange(select.Tokens);
while (level > 0 && tokenizer.Current.IsCharacter(TSQLCharacters.CloseParentheses))
{
set.Tokens.Add(tokenizer.Current);
level--;
tokenizer.MoveNext();
}
return(set);
}