public SqlExpressionInBracket(SymbolPosition leftb, SqlExpressionList inner, SymbolPosition rightb)
{
LeftBracket = leftb;
RightBracket = rightb;
Inner = inner;
Inner.Parent = this;
}
public SqlFunctionCall(SqlNameExpression name, SymbolPosition leftb, SqlExpressionList args, SymbolPosition rignhtb)
{
FunctionName = name;
LeftBracket = leftb;
Arguments = args;
RightBracket = rignhtb;
FunctionName.Parent = this;
Arguments.Parent = this;
}
protected SqlExpression ParseExprInBracket()
{
if (!IsSymbol("("))
{
return(null);
}
var leftb = SkipSymbol("(");
if (IsKeyword("select"))
{
SqlSelect select = ParseSelect();
SymbolPosition rightb = SkipSymbol(")");
return(new SqlSelectExpression(leftb, select, rightb));
}
else
{
SqlExpressionList inner = ParseExprList(IsCloseBracket);
SymbolPosition rightb = SkipSymbol(")");
return(new SqlExpressionInBracket(leftb, inner, rightb));
}
}
private SqlExpression ParseExprTerm()
{
if (IsSymbol("("))
{
return(ParseExprInBracket());
}
else
{
switch (Current)
{
case TokenType.IdentOrKeyword:
case TokenType.QuotedIdent:
var name = ParseName();
var ident = name as SqlIdentifier;
bool canbespecial = ident != null && !ident.IsQuoted;
if (IsSymbol("(")) // function call
{
SymbolPosition leftb = CurrentOriginal;
NextToken();
SqlExpressionList args = ParseExprList(IsCloseBracket);
SymbolPosition rightb = SkipSymbol(")");
if (AllowSpecialConstantReplacement && canbespecial && args.Items.Count == 0)
{
// maybe it is special function mappable to constant
SqlSpecialConstant sc = GetFunctionAsConstant(ident.Identifier);
if (sc != SqlSpecialConstant.None)
{
SymbolPosition pos = new SymbolPosition
{
Start = ident.Original.Start,
Stop = rightb.Stop,
Original = Tokernizer.SliceProvider,
};
return(new SpecialConstantSqlExpression(sc, pos));
}
}
return(new SqlFunctionCall(name, leftb, args, rightb));
}
if (AllowSpecialConstantReplacement && canbespecial)
{
if (ident.Identifier.ToUpper() == "NULL")
{
return(new NullSqlExpression(ident.Original));
}
// maybe it is special constant
SqlSpecialConstant sc = GetSymbolAsConstant(ident.Identifier);
if (sc != SqlSpecialConstant.None)
{
return(new SpecialConstantSqlExpression(sc, ident.Original));
}
}
return(name);
case TokenType.Symbol:
{
var starpos = SkipSymbol("*");
return(new SqlStarSymbol(starpos));
}
case TokenType.Number:
{
SymbolPosition pos = CurrentOriginal;
string numdata = CurrentData;
NextToken();
return(new ConstNumberSqlExpression(Double.Parse(numdata), pos));
}
break;
case TokenType.StringSingle:
{
return(ParseString());
}
break;
default:
throw CreateParseError("DAE-00252 Unexpected token:" + Current.ToString());
break;
}
}
}