public static FromItem Table(this TSQLFromClause fromClause)
{
return(fromClause.Tokens
.Where(t => t.Type == TSQLTokenType.Identifier)
.Select(f => new FromItem()
{
Index = f.Text.ToString()
}).Single());
}
public TSQLFromClause Parse(ITSQLTokenizer tokenizer)
{
TSQLFromClause from = new TSQLFromClause();
if (!tokenizer.Current.IsKeyword(TSQLKeywords.FROM))
{
throw new InvalidOperationException("FROM expected.");
}
from.Tokens.Add(tokenizer.Current);
// derived tables
// TVF
int nestedLevel = 0;
while (
tokenizer.MoveNext() &&
!(
tokenizer.Current.Type == TSQLTokenType.Character &&
tokenizer.Current.AsCharacter.Character == TSQLCharacters.Semicolon
) &&
!(
nestedLevel == 0 &&
tokenizer.Current.Type == TSQLTokenType.Character &&
tokenizer.Current.AsCharacter.Character == TSQLCharacters.CloseParentheses
) &&
(
nestedLevel > 0 ||
tokenizer.Current.Type != TSQLTokenType.Keyword ||
(
tokenizer.Current.Type == TSQLTokenType.Keyword &&
!tokenizer.Current.AsKeyword.Keyword.In
(
TSQLKeywords.WHERE,
TSQLKeywords.GROUP,
TSQLKeywords.HAVING,
TSQLKeywords.ORDER,
TSQLKeywords.UNION,
TSQLKeywords.EXCEPT,
TSQLKeywords.INTERSECT,
TSQLKeywords.FOR,
TSQLKeywords.OPTION
) &&
!tokenizer.Current.AsKeyword.Keyword.IsStatementStart()
)
))
{
TSQLSubqueryHelper.RecurseParens(
tokenizer,
from,
ref nestedLevel);
}
return(from);
}
public TSQLFromClause Parse(ITSQLTokenizer tokenizer)
{
TSQLFromClause from = new TSQLFromClause();
if (!tokenizer.Current.IsKeyword(TSQLKeywords.FROM))
{
throw new InvalidOperationException("FROM expected.");
}
from.Tokens.Add(tokenizer.Current);
// derived tables
// TVF
TSQLTokenParserHelper.ReadUntilStop(
tokenizer,
from,
new List <TSQLFutureKeywords>()
{
},
new List <TSQLKeywords>()
{
TSQLKeywords.WHERE,
TSQLKeywords.GROUP,
TSQLKeywords.HAVING,
TSQLKeywords.ORDER,
TSQLKeywords.UNION,
TSQLKeywords.EXCEPT,
TSQLKeywords.INTERSECT,
TSQLKeywords.FOR,
TSQLKeywords.OPTION
},
lookForStatementStarts: true);
return(from);
}
public TSQLFromClause Parse(ITSQLTokenizer tokenizer)
{
TSQLFromClause from = new TSQLFromClause();
if (!tokenizer.Current.IsKeyword(TSQLKeywords.FROM))
{
throw new InvalidOperationException("FROM expected.");
}
from.Tokens.Add(tokenizer.Current);
// derived tables
// TVF
int nestedLevel = 0;
while (
tokenizer.MoveNext() &&
!(
tokenizer.Current.Type == TSQLTokenType.Character &&
tokenizer.Current.AsCharacter.Character == TSQLCharacters.Semicolon
) &&
!(
nestedLevel == 0 &&
tokenizer.Current.Type == TSQLTokenType.Character &&
tokenizer.Current.AsCharacter.Character == TSQLCharacters.CloseParentheses
) &&
(
nestedLevel > 0 ||
tokenizer.Current.Type != TSQLTokenType.Keyword ||
(
tokenizer.Current.Type == TSQLTokenType.Keyword &&
tokenizer.Current.AsKeyword.Keyword.In
(
TSQLKeywords.JOIN,
TSQLKeywords.ON,
TSQLKeywords.INNER,
TSQLKeywords.LEFT,
TSQLKeywords.RIGHT,
TSQLKeywords.OUTER,
TSQLKeywords.CROSS,
TSQLKeywords.FULL,
TSQLKeywords.AS,
TSQLKeywords.PIVOT,
TSQLKeywords.UNPIVOT,
TSQLKeywords.WITH,
TSQLKeywords.MERGE,
TSQLKeywords.TABLESAMPLE,
TSQLKeywords.FOR,
TSQLKeywords.FROM, // FOR SYSTEM_TIME FROM
TSQLKeywords.BETWEEN,
TSQLKeywords.AND,
TSQLKeywords.IN,
TSQLKeywords.REPEATABLE,
TSQLKeywords.ALL
)
)
))
{
from.Tokens.Add(tokenizer.Current);
if (tokenizer.Current.Type == TSQLTokenType.Character)
{
TSQLCharacters character = tokenizer.Current.AsCharacter.Character;
if (character == TSQLCharacters.OpenParentheses)
{
// should we recurse for derived tables?
nestedLevel++;
if (tokenizer.MoveNext())
{
if (
tokenizer.Current.Type == TSQLTokenType.Keyword &&
tokenizer.Current.AsKeyword.Keyword == TSQLKeywords.SELECT)
{
TSQLSelectStatement selectStatement = new TSQLSelectStatementParser().Parse(tokenizer);
from.Tokens.AddRange(selectStatement.Tokens);
if (
tokenizer.Current != null &&
tokenizer.Current.Type == TSQLTokenType.Character &&
tokenizer.Current.AsCharacter.Character == TSQLCharacters.CloseParentheses)
{
nestedLevel--;
from.Tokens.Add(tokenizer.Current);
}
}
else if (tokenizer.Current.IsCharacter(
TSQLCharacters.CloseParentheses))
{
nestedLevel--;
from.Tokens.Add(tokenizer.Current);
}
else
{
from.Tokens.Add(tokenizer.Current);
}
}
}
else if (character == TSQLCharacters.CloseParentheses)
{
nestedLevel--;
}
}
}
return(from);
}
public TSQLFromClause Parse(TSQLTokenizer tokenizer)
{
TSQLFromClause from = new TSQLFromClause();
if (
tokenizer.Current == null ||
tokenizer.Current.Type != TSQLTokenType.Keyword ||
tokenizer.Current.AsKeyword.Keyword != TSQLKeywords.FROM)
{
throw new ApplicationException("FROM expected.");
}
from.Tokens.Add(tokenizer.Current);
// derived tables
// TVF
int nestedLevel = 0;
while (
tokenizer.Read() &&
!(
tokenizer.Current.Type == TSQLTokenType.Character &&
tokenizer.Current.AsCharacter.Character == TSQLCharacters.Semicolon
) &&
!(
nestedLevel == 0 &&
tokenizer.Current.Type == TSQLTokenType.Character &&
tokenizer.Current.AsCharacter.Character == TSQLCharacters.CloseParentheses
) &&
(
nestedLevel > 0 ||
tokenizer.Current.Type != TSQLTokenType.Keyword ||
(
tokenizer.Current.Type == TSQLTokenType.Keyword &&
tokenizer.Current.AsKeyword.Keyword.In
(
TSQLKeywords.JOIN,
TSQLKeywords.ON,
TSQLKeywords.INNER,
TSQLKeywords.LEFT,
TSQLKeywords.RIGHT,
TSQLKeywords.OUTER,
TSQLKeywords.CROSS,
TSQLKeywords.FULL,
TSQLKeywords.AS,
TSQLKeywords.PIVOT,
TSQLKeywords.UNPIVOT,
TSQLKeywords.WITH,
TSQLKeywords.MERGE,
TSQLKeywords.TABLESAMPLE,
TSQLKeywords.FOR,
TSQLKeywords.FROM, // FOR SYSTEM_TIME FROM
TSQLKeywords.BETWEEN,
TSQLKeywords.AND,
TSQLKeywords.IN,
TSQLKeywords.REPEATABLE,
TSQLKeywords.ALL
)
)
))
{
from.Tokens.Add(tokenizer.Current);
if (tokenizer.Current.Type == TSQLTokenType.Character)
{
TSQLCharacters character = tokenizer.Current.AsCharacter.Character;
if (character == TSQLCharacters.OpenParentheses)
{
// should we recurse for derived tables?
nestedLevel++;
if (tokenizer.Read())
{
if (
tokenizer.Current.Type == TSQLTokenType.Keyword &&
tokenizer.Current.AsKeyword.Keyword == TSQLKeywords.SELECT)
{
TSQLSelectStatement selectStatement = new TSQLSelectStatementParser().Parse(tokenizer);
from.Tokens.AddRange(selectStatement.Tokens);
if (
tokenizer.Current != null &&
tokenizer.Current.Type == TSQLTokenType.Character &&
tokenizer.Current.AsCharacter.Character == TSQLCharacters.CloseParentheses)
{
nestedLevel--;
from.Tokens.Add(tokenizer.Current);
}
}
else
{
from.Tokens.Add(tokenizer.Current);
}
}
}
else if (character == TSQLCharacters.CloseParentheses)
{
nestedLevel--;
}
}
}
return from;
}
