protected SqlSourceItem ParseSourceItem()
{
if (IsSymbol("("))
{
SymbolPosition leftb = SkipSymbol("(");
if (IsKeyword("select"))
{
SqlSelect select = ParseSelect();
SymbolPosition rightb = SkipSymbol(")");
var expr = new SqlSelectExpression(leftb, select, rightb);
var alias = ParseAlias();
return(new SqlSelectSourceItem(expr, alias));
}
else
{
var lst = ParseSourceList();
SymbolPosition rightb = SkipSymbol(")");
var alias = ParseAlias();
return(new SqlSourceListSourceItem(leftb, lst, rightb, alias));
}
}
else
{
var expr = ParseExpression();
var alias = ParseAlias();
return(new SqlTableSourceItem(expr, alias));
}
}
public bool EqualTo(SqlSelect other, SqlEqualityTestProps props)
{
if (!ResultFields.EqualSequence(other.ResultFields, (a, b) => a.EqualTo(b, props)))
{
return(false);
}
if (!Clauses.EqualSequence(other.Clauses, (a, b) => a.EqualTo(b, props)))
{
return(false);
}
return(true);
}
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));
}
}
public SqlSelectExpression(SymbolPosition leftb, SqlSelect select, SymbolPosition rightb)
{
LeftBracket = leftb;
Select = select;
RightBracket = rightb;
}