public void Parse(LexemCollection collection)
{
while (true)
{
var idx = collection.IndexLexem;
ExpressionParser tonode = new ExpressionParser(collection);
tonode.Parse();
if (tonode.Results.Count != 1)
{
collection.Error("не верное число параметров", collection.Get(idx));
}
ColumnClause r = new ColumnClause();
r.ColumnExpression = tonode.Single();
Columns.Add(r);
var lex = collection.CurrentLexem();
if (lex == null)
{
return;
}
if (lex.LexemText.ToLower() == "as")
{
collection.GotoNext();
if (lex == null)
{
return;
}
r.Alias = CommonParserFunc.ReadAlias(collection);
lex = collection.GotoNext();
}
else
if (nextStrings.Contains(lex.LexemText.ToLower()))
{
return;
}
else
{
if (lex.LexemType == LexType.Command || lex.LexemType == LexType.Text)
{
r.Alias = CommonParserFunc.ReadAlias(collection);
lex = collection.GotoNext();
}
}
if (lex == null)
{
return;
}
if (nextStrings.Contains(lex.LexemText.ToLower()))
{
return;
}
if (lex.LexemType == LexType.Zpt)
{
collection.GotoNext();
continue;
}
return;
}
}
public override IExplore Expolore(DelegateExpessionExplorer del)
{
if (TableClause != null)
{
TableClause = (TableClause)TableClause.Expolore(del);
}
List <ColumnClause> Returning2 = new List <ColumnClause>();
ReturningColumns.ForEach(a =>
{
ColumnClause ss = (ColumnClause)a.Expolore(del);
if (ss != null)
{
Returning2.Add(ss);
}
});
ReturningColumns.Replace(Returning2);
return(base.Expolore(del));
}
public static string GetVisibleColumnName(ColumnClause cs)
{
string nm = cs.Alias;
if (String.IsNullOrEmpty(nm))
{
if (cs.ColumnExpression is ReplacedFieldExpr)
{
nm = ((ReplacedFieldExpr)cs.ColumnExpression).Field.FieldName;
}
else
if (cs.ColumnExpression is FieldExpr)
{
nm = ((FieldExpr)cs.ColumnExpression).FieldName;
}
else
{
nm = cs.ColumnExpression.ToStr();
}
}
return(nm);
}
