public TSQLCaseExpression Parse(ITSQLTokenizer tokenizer)
{
TSQLCaseExpression caseExpression = new TSQLCaseExpression();
if (!tokenizer.Current.IsKeyword(TSQLKeywords.CASE))
{
throw new InvalidOperationException("CASE expected.");
}
caseExpression.Tokens.Add(tokenizer.Current);
int nestedLevel = 0;
while (
tokenizer.MoveNext() &&
!tokenizer.Current.IsCharacter(TSQLCharacters.Semicolon) &&
!(
nestedLevel == 0 &&
tokenizer.Current.IsCharacter(TSQLCharacters.CloseParentheses)
) &&
(
nestedLevel > 0 ||
tokenizer.Current.Type != TSQLTokenType.Keyword ||
(
tokenizer.Current.Type == TSQLTokenType.Keyword &&
!tokenizer.Current.AsKeyword.Keyword.In
(
TSQLKeywords.END
)
)
))
{
TSQLSubqueryHelper.RecurseParens(
tokenizer,
caseExpression,
ref nestedLevel);
}
return(caseExpression);
}
