protected SqlSelectColumn(SqlParserState state, out AmpElement error)
{
Kind = SqlKind.SelectColumnSyntax;
if (SqlParser.TryParse <SqlExpression>(state, out var sqlExpression))
{
Expression = sqlExpression;
}
else
{
error = state.Error;
return;
}
if (state.IsKind(SqlKind.AsToken))
{
AsToken = state.CurrentToken;
state.Read();
}
if (state.IsKind(SqlKind.IdentifierToken) || state.IsKind(SqlKind.QuotedIdentifierToken))
{
NameToken = state.CurrentToken;
state.Read();
}
else if (AsToken != null)
{
error = SqlParseError.Construct(state);
return;
}
error = null;
}
protected SqlLimitClause(SqlParserState state, out AmpElement error)
{
if (state.IsKind(SqlKind.FetchToken))
{
items.Add(state.CurrentToken);
state.Read();
if (state.IsKind(SqlKind.FirstToken))
{
items.Add(state.CurrentToken);
state.Read();
if (state.IsKind(SqlKind.NumericValueToken))
{
items.Add(state.CurrentToken);
state.Read();
if (state.IsKind(SqlKind.RowsToken))
{
items.Add(state.CurrentToken);
state.Read();
if (state.IsKind(SqlKind.OnlyToken))
{
items.Add(state.CurrentToken);
state.Read();
}
}
}
}
}
error = null;
}
protected SqlJoinClause(SqlParserState state, out AmpElement error)
{
Kind = SqlKind.JoinClause;
if (state.IsKind(SqlKind.LeftToken) || state.IsKind(SqlKind.RightToken))
{
SideToken = state.CurrentToken;
state.Read();
}
if (state.IsKind(SqlKind.OuterToken) || state.IsKind(SqlKind.InnerToken))
{
OuterToken = state.CurrentToken;
state.Read();
}
if (!state.IsKind(SqlKind.JoinToken))
{
error = SqlParseError.Construct(state);
return;
}
JoinToken = state.CurrentToken;
state.Read();
if (SqlParser.TryParse <SqlSelectSource>(state, out var source))
{
Source = source;
}
else
{
error = state.Error;
return;
}
if (state.IsKind(SqlKind.OnToken))
{
OnToken = state.CurrentToken;
state.Read();
if (SqlParser.TryParse <SqlExpression>(state, out var onExpression))
{
OnExpression = onExpression;
}
else
{
error = state.Error;
return;
}
}
error = null;
}
protected SqlCommaSeparatedTokenList(SqlParserState state, out AmpElement error)
: base(Enumerable.Empty <TElement>())
{
List <AmpElement <SqlKind> > items = new List <AmpElement <SqlKind> >();
while (true)
{
if (SqlParser.TryParse <TElement>(state, out var v))
{
items.Add(v);
}
else
{
error = state.Error;
return;
}
if (state.IsKind(SqlKind.CommaToken))
{
items.Add(state.CurrentToken);
state.Read();
continue;
}
else
{
break;
}
}
SetItems(items);
error = null;
}
protected SqlFromClause(SqlParserState state, out AmpElement error)
{
Kind = SqlKind.FromClause;
if (state.IsKind(SqlKind.FromToken))
{
FromToken = state.CurrentToken;
state.Read();
}
else
{
error = SqlParseError.Construct(state);
return;
}
if (SqlParser.TryParse <SqlCommaSeparatedTokenList <SqlSelectSource> >(state, out var sources))
{
Sources = sources;
}
else
{
error = state.Error;
return;
}
error = null;
}
protected SqlWhereClause(SqlParserState state, out AmpElement error)
{
Kind = SqlKind.WhereClause;
if (state.IsKind(SqlKind.WhereToken))
{
WhereToken = state.CurrentToken;
state.Read();
}
else
{
error = SqlParseError.Construct(state);
return;
}
if (SqlParser.TryParse <SqlExpression>(state, out var expr))
{
Expression = expr;
}
else
{
error = state.Error;
return;
}
error = null;
}
protected SqlExpression(SqlParserState state, out AmpElement error)
{
if (state.IsKind(SqlKind.NotToken, SqlKind.MinusOperatorToken, SqlKind.PlusOperatorToken, SqlKind.TildeOperatorToken))
{
items.Add(state.CurrentToken);
state.Read();
}
if (state.IsKind(SqlKind.ExistsToken) && state.PeekKind(SqlKind.OpenParenToken))
{
items.Add(state.CurrentToken);
state.Read();
// Fall through in OpenParenToken
}
if (state.IsKind(SqlKind.OpenParenToken))
{
items.Add(state.CurrentToken);
state.Read();
if (state.IsKind(SqlKind.SelectToken) &&
SqlParser.TryParse <SqlSelect>(state, out var subSelect))
{
items.Add(subSelect);
}
else if (SqlParser.TryParse <SqlExpression>(state, out var expr))
{
items.Add(expr);
}
else
{
error = state.Error ?? SqlParseError.Construct(state);
return;
}
if (state.IsKind(SqlKind.CloseParenToken))
{
items.Add(state.CurrentToken);
state.Read();
}
else
{
error = state.Error ?? SqlParseError.Construct(state);
return;
}
}
else if (state.IsKind(SqlKind.IdentifierToken) || state.IsKind(SqlKind.QuotedIdentifierToken))
{
if (state.PeekItem(0)?.Kind == SqlKind.DotToken &&
(state.PeekItem(1)?.Kind == SqlKind.IdentifierToken || state.PeekItem(1)?.Kind == SqlKind.QuotedIdentifierToken))
{
items.Add(new AmpElementList <SqlKind>(state.ReadMany(3)));
}
else
{
items.Add(state.CurrentToken);
state.Read();
}
if (state.IsKind(SqlKind.OpenParenToken))
{
items.Add(state.CurrentToken);
state.Read();
if (!SqlParser.TryParse <SqlCommaSeparatedTokenList <SqlExpression> >(state, out var arguments))
{
error = state.Error;
return;
}
items.Add(arguments);
if (state.IsKind(SqlKind.CloseParenToken))
{
items.Add(state.CurrentToken);
state.Read();
}
else
{
error = SqlParseError.Construct(state);
return;
}
}
}
else if (state.IsKind(SqlKind.NumericValueToken, SqlKind.DoubleValueToken, SqlKind.StringToken, SqlKind.NullToken))
{
items.Add(state.CurrentToken);
state.Read();
}
else if (state.IsKind(SqlKind.CaseToken))
{
if (!SqlParser.TryParse <SqlCaseClause>(state, out var @case))
{
error = state.Error;
return;
}
items.Add(@case);
}
else
{
error = state.Error ?? SqlParseError.Construct(state);
return;
}
switch (state.Current.Kind)
{
case SqlKind.IsNullToken:
case SqlKind.NotNullToken:
items.Add(state.CurrentToken);
state.Read();
break;
case SqlKind.NotToken when state.PeekKind(SqlKind.NullToken):
items.Add(state.CurrentToken);
state.Read();
items.Add(state.CurrentToken);
state.Read();
break;
}
switch (state.Current.Kind)
{
case SqlKind.EqualOperatorToken:
case SqlKind.NotEqualToken:
case SqlKind.LessThanOrEqualToken:
case SqlKind.LessThanToken:
case SqlKind.GreaterThanOrEqualToken:
case SqlKind.GreaterThanToken:
case SqlKind.AndToken:
case SqlKind.OrToken:
case SqlKind.LikeToken:
case SqlKind.ConcatToken:
case SqlKind.PlusOperatorToken:
case SqlKind.MinusOperatorToken:
case SqlKind.AsteriksOperatorToken:
case SqlKind.DivOperatorToken:
case SqlKind.ShiftLeftToken:
case SqlKind.InToken:
case SqlKind.ShiftRightToken:
case SqlKind.BetweenToken:
case SqlKind.IsToken:
if (state.Current.Kind == SqlKind.IsToken && state.PeekKind(SqlKind.NotToken))
{
items.Add(state.CurrentToken);
state.Read();
}
items.Add(state.CurrentToken);
state.Read();
if (SqlParser.TryParse <SqlExpression>(state, out var subExpression))
{
items.Add(subExpression);
}
else
{
error = state.Error;
return;
}
break;
case SqlKind.NotToken when state.PeekKind(SqlKind.BetweenToken, SqlKind.InToken):
// TODO: Many more
items.Add(state.CurrentToken);
state.Read();
goto case SqlKind.BetweenToken;
default:
break;
}
error = null;
}
protected SqlCaseClause(SqlParserState state, out AmpElement error)
{
Kind = SqlKind.SqlCaseClause;
if (!state.IsKind(SqlKind.CaseToken))
{
error = SqlParseError.Construct(state);
return;
}
CaseToken = state.CurrentToken;
state.Read();
if (!state.IsKind(SqlKind.WhenToken, SqlKind.ElseToken, SqlKind.EndToken))
{
if (!SqlParser.TryParse <SqlExpression>(state, out var caseExpr))
{
error = SqlParseError.Construct(state);
return;
}
CaseExpression = caseExpr;
}
List <SqlWhenClause> whens = new List <SqlWhenClause>();
while (state.IsKind(SqlKind.WhenToken))
{
SqlToken whenToken = state.CurrentToken;
state.Read();
if (!SqlParser.TryParse <SqlExpression>(state, out var whenExpr))
{
error = SqlParseError.Construct(state);
return;
}
if (!state.IsKind(SqlKind.ThenToken))
{
error = SqlParseError.Construct(state);
return;
}
SqlToken thenToken = state.CurrentToken;
state.Read();
if (!SqlParser.TryParse <SqlExpression>(state, out var thenExpr))
{
error = SqlParseError.Construct(state);
return;
}
whens.Add(new SqlWhenClause(whenToken, whenExpr, thenToken, thenExpr));
}
Whens = SqlSyntaxList <SqlWhenClause> .FromItems(whens);
if (state.IsKind(SqlKind.ElseToken))
{
ElseToken = state.CurrentToken;
state.Read();
if (!SqlParser.TryParse <SqlExpression>(state, out var elseExpr))
{
error = SqlParseError.Construct(state);
return;
}
ElseExpression = elseExpr;
}
if (state.IsKind(SqlKind.EndToken))
{
EndToken = state.CurrentToken;
state.Read();
error = null;
}
else
{
error = SqlParseError.Construct(state);
}
}
protected SqlSelect(SqlParserState state, out AmpElement error)
{
Kind = SqlKind.SelectSyntax;
if (state.IsKind(SqlKind.WithToken))
{
if (!SqlParser.TryParse <SqlWithClause>(state, out var wp))
{
error = state.Error;
return;
}
WithPart = wp;
}
if (state.IsKind(SqlKind.SelectToken))
{
SelectToken = (SqlToken)state.Current;
state.Read();
}
if (state.IsKind(SqlKind.DistinctToken))
{
DistinctAllModifier = state.CurrentToken;
state.Read();
}
else if (state.IsKind(SqlKind.AllToken))
{
DistinctAllModifier = state.CurrentToken;
state.Read();
}
if (SqlParser.TryParse <SqlCommaSeparatedTokenList <SqlSelectColumn> >(state, out var cols))
{
ResultColumns = cols;
}
else
{
error = state.Error;
return;
}
if (state.IsKind(SqlKind.FromToken))
{
if (!SqlParser.TryParse <SqlFromClause>(state, out var from))
{
error = state.Error;
return;
}
FromClause = from;
}
List <SqlJoinClause> joins = new List <SqlJoinClause>();
while (state.IsKind(SqlKind.JoinToken, SqlKind.OuterJoinToken, SqlKind.LeftToken, SqlKind.RightToken, SqlKind.InnerToken, SqlKind.CrossToken))
{
if (!SqlParser.TryParse <SqlJoinClause>(state, out var joinClause))
{
error = state.Error;
return;
}
joins.Add(joinClause);
}
if (joins.Count > 0)
{
JoinClauses = SqlSyntaxList <SqlJoinClause> .FromItems(joins);
}
if (state.IsKind(SqlKind.WhereToken))
{
if (!SqlParser.TryParse <SqlWhereClause>(state, out var where))
{
error = state.Error;
return;
}
WhereClause = where;
}
// GROUP BY
// COMPOUND
// ORDER BY
if (state.IsKind(SqlKind.FetchToken))
{
if (!SqlParser.TryParse <SqlLimitClause>(state, out var limit))
{
error = state.Error;
return;
}
LimitClause = limit;
}
error = null;
}