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;
}
}
private TableClause Read_table_reference(LexemCollection collection, bool isFirst)
{
var lex = collection.CurrentLexem();
if (lex == null)
{
return(null);
}
//+left join
//+left outer join
//+inner join
//+cross join
//+join
//+right join
//+right outer join
// full join
JoinType jt = JoinType.Cross;
if (!isFirst)
{
string s1 = collection.CurrentLexem().LexemText.ToLower();
string s2 = null;
string s3 = null;
if (joinStrings.Contains(s1))
{
lex = collection.GotoNext();
if (lex != null && joinStrings.Contains(lex.LexemText.ToLower()))
{
s2 = lex.LexemText.ToLower();
lex = collection.GotoNext();
if (lex != null && joinStrings.Contains(lex.LexemText.ToLower()))
{
s3 = lex.LexemText.ToLower();
lex = collection.GotoNext();
}
}
}
if (!joinStrings.Contains(s1))// случай ","
{
jt = JoinType.Cross;
}
else
if ((s3 == null && s2 == null && s1 == "join") ||
(s3 == null && s1 == "cross" && s2 == "join"))
{
jt = JoinType.Cross;
}
else if ((s3 == null && s1 == "left" && s2 == "join") ||
(s1 == "left" && s2 == "outer" && s3 == "join"))
{
jt = JoinType.Left;
}
else if ((s3 == null && s1 == "right" && s2 == "join") ||
(s1 == "right" && s2 == "outer" && s3 == "join"))
{
jt = JoinType.Left;
}
else if (s3 == null && s1 == "inner" && s2 == "join")
{
jt = JoinType.Inner;
}
else if (s3 == null && s1 == "full" && s2 == "join")
{
jt = JoinType.Full;
}
else
{
collection.Error("Unknow JOIN clause", collection.CurrentLexem());
}
}
TableClause st = null;
if (lex == null)
{
collection.Error("Error in table clause", collection.GetPrev());
}
if (!lex.IsSkobraOpen())
{
string[] tableName = CommonParserFunc.ReadTableName(collection);
var v = collection.TableGetter.GetTableByName(tableName, collection.TableGetterUseCache);
st = TableClause.CreateByTable(tableName, v);
lex = collection.GotoNext();
}
else
{
lex = collection.GotoNext();
if (lex == null)
{
collection.Error("Expression is not found", collection.GetLast());
}
//подзапрос
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));
}
lex = collection.CurrentLexem();
if (lex == null || !lex.IsSkobraClose())
{
collection.Error("Expression is not closed", collection.CurrentLexem());
}
lex = collection.GotoNext();
//ITableDesc subselect = CommonUtils.FindParentSelect(tonode.Single()); Это штука работает не правильно
ITableDesc subselect = (ITableDesc)tonode.Single();
if (subselect == null)
{
collection.Error("Subselect not found", collection.Get(idx));
}
st = TableClause.CreateBySelect(subselect);
}
st.Join = jt;
if (lex == null)
{
return(st);
}
if (lex.LexemText.ToLower() == "as")
{
collection.GotoNext();
if (lex == null)
{
collection.Error("Alias not found", collection.GetPrev());
}
st.Alias = CommonParserFunc.ReadAlias(collection);
if (st.Alias == null)
{
collection.Error("Alias not found", collection.GetPrev());
}
lex = collection.GotoNext();
}
else
{
if (lex.LexemType == LexType.Text)
{
st.Alias = CommonParserFunc.ReadAlias(collection);
if (st.Alias == null)
{
collection.Error("Alias not found", collection.GetPrev());
}
lex = collection.GotoNext();
}
else
if (lex.LexemType == LexType.Command &&
!nextStrings.Contains(lex.LexemText.ToLower()) &&
!joinStrings.Contains(lex.LexemText.ToLower()) &&
lex.LexemText.ToLower() != "on")
{
st.Alias = CommonParserFunc.ReadAlias(collection);
if (st.Alias == null)
{
collection.Error("Alias not found", collection.GetPrev());
}
lex = collection.GotoNext();
}
}
lex = collection.CurrentLexem();
if (lex == null)
{
return(st);
}
if (lex.LexemType == LexType.Command && lex.LexemText.ToLower() == "on")
{
lex = collection.GotoNext();
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));
}
st.OnExpression = tonode.Single();
}
return(st);
}