public static Expression ParseCollection(LexemCollection collection)
{
ExpressionParser p = new ExpressionParser(collection);
p.Parse();
return(p.Single());
}
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 void Parse(LexemCollection collection, bool isOrderBy)
{
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));
}
GroupByClause r = null;
if (isOrderBy)
{
r = new OrderByClause();
}
else
{
r = new GroupByClause();
}
r.Expression = tonode.Single();
Columns.Add(r);
var lex = collection.CurrentLexem();
if (lex == null)
{
return;
}
if (isOrderBy)
{
if (lex.LexemText.ToLower() == "desc")
{
((OrderByClause)r).Sort = SortType.DESC;
lex = collection.GotoNext();
}
else if (lex.LexemText.ToLower() == "asc")
{
((OrderByClause)r).Sort = SortType.ASC;
lex = collection.GotoNext();
}
}
if (lex == null)
{
return;
}
if (lex.LexemType == LexType.Zpt)
{
collection.GotoNext();
continue;
}
return;
}
}
/// <summary>
/// Формирует простое выражение, не-SQL типа
/// </summary>
public static Expression GetSimpleExpression(string text, IExpressionFactory factory)
{
var collection = ParserLexem.Parse(text);
collection.NodeFactory = factory;
ExpressionParser expToNode = new ExpressionParser(collection);
expToNode.Parse();
var res = expToNode.Single();
res = res.PrepareAndOptimize();
return(res);
}
public override void ParseInside(ExpressionParser parser)
{
var collection = parser.Collection;
var lex = collection.CurrentLexem();
if (lex.LexemText.ToLower() != "delete")
{
throw new Exception("Not DELETE statment");
}
lex = collection.GotoNextMust();
if (lex.LexemText.ToLower() != "from")
{
throw new Exception("Keyword 'FROM' is not found");
}
lex = collection.GotoNextMust();
FromParser fc = new FromParser();
fc.Parse(collection);
if (fc.Tables.Count > 1)
{
collection.Error("Multi tables in update", collection.CurrentLexem());
}
if (fc.Tables.Count == 0)
{
collection.Error("Not table clause", collection.CurrentLexem());
}
TableClause = fc.Tables[0];
//string[] tablename = CommonParserFunc.ReadTableName(collection);
//TableClause = TableClause.CreateByTable(tablename, collection.TableGetter.GetTableByName(tablename));
lex = collection.CurrentLexem();
if (lex == null)
{
return;
}
if (lex.LexemText.ToLower() == "where")
{
collection.GotoNextMust();
ExpressionParser e = new ExpressionParser(collection);
e.Parse();
Where = e.Single();
}
ParseReturining(parser);
}
public override void Parse()
{
var idx = Collection.IndexLexem;
var le = Collection.GotoNext();
if (le == null)
{
Collection.Error("неожиданный конец", Collection.GetPrev());
}
if (le.IsSkobraClose())
{
Collection.Error("пустое выражение", Collection.CurrentLexem());
}
ExpressionParser tonode = new ExpressionParser(Collection);
tonode.Parse();
if (Collection.CurrentLexem() == null)
{
Collection.Error("нет закрывающейся скобки", Collection.GetLast());
}
if (tonode.Results.Count == 0)
{
Collection.Error("нет значений", Collection.Get(idx));
}
if (tonode.Results.Count > 1)
{
Collection.Error("несколько значений", Collection.Get(idx));
}
var t = new SubExpression();
t.AddChild(tonode.Single());
Results.Add(t);
if (!Collection.CurrentLexem().IsSkobraClose())
{
Collection.Error("нет закрывающейся скобки", Collection.CurrentLexem());
}
}
public override void ParseInside(ExpressionParser parser)
{
var collection = parser.Collection;
var lex = collection.CurrentLexem();
if (lex.LexemText.ToLower() != "insert")
{
throw new Exception("Not INSERT statment");
}
lex = collection.GotoNextMust();
if (lex.LexemText.ToLower() != "into")
{
throw new Exception("INTO keyword is not found");
}
lex = collection.GotoNextMust();
string[] tablename = CommonParserFunc.ReadTableName(collection);
TableClause = TableClause.CreateByTable(tablename, collection.TableGetter.GetTableByName(tablename, collection.TableGetterUseCache));
lex = collection.GotoNextMust();
if (lex.IsSkobraOpen())
{
while (true)
{
lex = collection.GotoNextMust(); //пропускаем SET или ','
//lex = collection.CurrentLexem();
var col = CommonParserFunc.ReadColumn(collection);
ColumnOfValues.Add(col);
lex = collection.GotoNextMust();
if (lex == null)
{
break;
}
if (lex.LexemType == LexType.Zpt)
{
continue;
}
if (lex.IsSkobraClose())
{
break;
}
collection.Error("Unknow lexem", collection.CurrentLexem());
}
//пропускаем ')'
lex = collection.GotoNextMust();
}
else
{
if (lex.LexemType == LexType.Command && lex.LexemText.ToLower() == "default")
{
lex = collection.GotoNextMust();
if (lex.LexemType == LexType.Command && lex.LexemText.ToLower() == "values")
{
DefaultValues = true;
return;
}
else
{
collection.Error("Expected keyword VALUES", lex);
}
}
}
if (lex == null)
{
return;
}
if (lex.LexemText.ToLower() == "values")
{
lex = collection.GotoNextMust();
if (!lex.IsSkobraOpen())
{
collection.Error("'(' not found", lex);
}
while (true)
{
SubExpression sub = new SubExpression();
sub.MultiValues = true;
while (true)
{
lex = collection.GotoNextMust(); //пропускаем SET или ','
//lex = collection.CurrentLexem();
ExpressionParser e = new ExpressionParser(collection);
e.Parse();
sub.AddChild(e.Single());
lex = collection.CurrentLexem();
if (lex == null)
{
break;
}
if (lex.LexemType == LexType.Zpt)
{
continue;
}
if (lex.IsSkobraClose())
{
break;
}
collection.Error("Unknow lexem", collection.CurrentLexem());
}
Values.Add(sub);
lex = collection.GotoNext();
if (lex != null && lex.LexemType == LexType.Zpt)
{
lex = collection.GotoNextMust();
if (!lex.IsSkobraOpen())
{
collection.ErrorWaitKeyWord("(", lex);
}
continue;
}
else
{
break;
}
}
}
else
if (lex.LexemText.ToLower() == "select" || lex.IsSkobraOpen())
{
ExpressionParser e = new ExpressionParser(collection);
e.Parse();
var expr = e.Single();
var sel = ParserUtils.FindSelect(expr);
if (sel == null)
{
throw new Exception("Values in INSERT not found");
}
Select = sel;
}
ParseReturining(parser);
}
public override void ParseInside(ExpressionParser parser)
{
var collection = parser.Collection;
var lex = collection.CurrentLexem();
if (lex.LexemText.ToLower() != "update")
{
throw new Exception("Not UPDATE statment");
}
lex = collection.GotoNextMust();
FromParser fc = new FromParser();
fc.Parse(collection);
if (fc.Tables.Count > 1)
{
collection.Error("Multi tables in update", collection.CurrentLexem());
}
if (fc.Tables.Count == 0)
{
collection.Error("Not table clause", collection.CurrentLexem());
}
TableClause = fc.Tables[0];
//string[] tablename = CommonParserFunc.ReadTableName(collection);
//TableClause = TableClause.CreateByTable(tablename, collection.TableGetter.GetTableByName(tablename));
//lex = collection.GotoNextMust();
lex = collection.CurrentLexem();
if (lex.LexemText.ToLower() != "set")
{
collection.Error("SET keyword is not found", collection.CurrentLexem());
}
while (true)
{
lex = collection.GotoNextMust();//пропускаем SET или ','
//lex = collection.CurrentLexem();
SetClause sc = new SetClause();
sc.Column = CommonParserFunc.ReadColumn(collection);
lex = collection.GotoNextMust();
if (lex.LexemText != "=")
{
collection.Error("Operator '=' is not found", collection.CurrentLexem());
}
lex = collection.GotoNextMust();
ExpressionParser e = new ExpressionParser(parser.Collection);
e.Parse();
sc.Value = e.Single();
Set.Add(sc);
lex = collection.CurrentLexem();
if (lex == null)
{
break;
}
if (lex.LexemType == LexType.Zpt)
{
continue;
}
break;
}
if (lex == null)
{
return;
}
if (lex.LexemText.ToLower() == "where")
{
collection.GotoNextMust();
ExpressionParser e = new ExpressionParser(parser.Collection);
e.Parse();
Where = e.Single();
}
ParseReturining(parser);
}
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);
}
public override void ParseInside(ExpressionParser parser)
{
var collection = parser.Collection;
var le = collection.GotoNextMust();
if (le.LexemType != LexType.Command || le.LexemText.ToLower() != "when")
{
int idx = collection.IndexLexem;
ExpressionParser tonode = new ExpressionParser(collection);
tonode.Parse();
if (tonode.Results.Count != 1)
{
collection.Error("не верное число параметров", collection.Get(idx));
}
CaseArg = tonode.Single();
le = collection.CurrentLexem();
}
if (le.LexemType != LexType.Command || le.LexemText.ToLower() != "when")
{
collection.Error("Ожидалось WHEN", collection.CurrentOrLast());
}
while (le.LexemType == LexType.Command && le.LexemText.ToLower() == "when")
{
WhenThen wt = new WhenThen();
collection.GotoNextMust();
int idx = collection.IndexLexem;
ExpressionParser tonode = new ExpressionParser(collection);
tonode.Parse();
if (tonode.Results.Count != 1)
{
collection.Error("не верное число параметров", collection.Get(idx));
}
wt.When = tonode.Single();
le = collection.CurrentLexem();
if (le == null || le.LexemType != LexType.Command || le.LexemText.ToLower() != "then")
{
collection.Error("ожидалось THEN", collection.CurrentOrLast());
}
le = collection.GotoNextMust();
idx = collection.IndexLexem;
tonode = new ExpressionParser(collection);
tonode.Parse();
if (tonode.Results.Count != 1)
{
collection.Error("не верное число параметров", collection.Get(idx));
}
wt.Then = tonode.Single();
ListWhenThen.Add(wt);
le = collection.CurrentLexem();
if (le == null)
{
collection.Error("Не найден END", collection.GetLast());
}
if (le.LexemText.ToLower() == "end")
{
break;
}
if (le.LexemText.ToLower() == "when")
{
continue;
}
if (le.LexemText.ToLower() == "else")
{
le = collection.GotoNextMust();
idx = collection.IndexLexem;
tonode = new ExpressionParser(collection);
tonode.Parse();
if (tonode.Results.Count != 1)
{
collection.Error("не верное число параметров", collection.Get(idx));
}
Else = tonode.Single();
le = collection.CurrentLexem();
if (le == null || le.LexemText.ToLower() != "end")
{
collection.Error("Ожидался END", collection.CurrentOrLast());
}
break;
}
collection.Error("Не ожиданный конец", collection.CurrentOrLast());
}
base.ParseInside(parser);
}
public override void Parse()
{
//текщая лексема SELECT
var le = Collection.GotoNext();
if (le == null) Collection.Error("неожиданный конец", Collection.GetPrev());
if (le.LexemText.ToLower() == "distinct")
{
SelectExpresion.Distinct = true;
le = Collection.GotoNextMust();
}
else if (le.LexemText.ToLower() == "all")
{
le = Collection.GotoNextMust();
}
var idx = Collection.IndexLexem;
ColumnClauseParser colsParser = new ColumnClauseParser();
colsParser.Parse(Collection);
if (colsParser.Columns.Count == 0) Collection.Error("Columnn not found", Collection.Get(idx));
Results.Add(SelectExpresion);
SelectExpresion.Columns.Replace(colsParser.Columns);
var lex = Collection.CurrentLexem();
if (lex == null) return;
if (lex.LexemText.ToLower() != "from") return;
lex = Collection.GotoNext();
FromParser fc = new FromParser();
fc.Parse(Collection);
SelectExpresion.Tables.Replace(fc.Tables);
lex = Collection.CurrentLexem();
if (lex == null) return;
if (lex.LexemText.ToLower() == "where")
{
lex = Collection.GotoNext();
if (lex == null) Collection.Error("Where clause not found", Collection.GetPrev());
idx = Collection.IndexLexem;
ExpressionParser tonode = new ExpressionParser(Collection);
tonode.Parse();
if (tonode.Results.Count != 1) Collection.Error("не верное число параметров", Collection.Get(idx));
SelectExpresion.WhereExpr = tonode.Single();
}
lex = Collection.CurrentLexem();
if (lex == null) return;
if (lex.LexemText.ToLower() == "having")
{
lex = Collection.GotoNext();
if (lex == null) Collection.Error("Having clause not found", Collection.GetPrev());
idx = Collection.IndexLexem;
ExpressionParser tonode = new ExpressionParser(Collection);
tonode.Parse();
if (tonode.Results.Count != 1) Collection.Error("не верное число параметров", Collection.Get(idx));
SelectExpresion.Having = tonode.Single();
}
lex = Collection.CurrentLexem();
if (lex == null) return;
if (lex.LexemText.ToLower() == "group")
{
lex = Collection.GotoNext();
if (lex == null) Collection.Error("Group by clause error", Collection.GetPrev());
if (lex.LexemText.ToLower() != "by") Collection.Error("Group by clause error", Collection.GetPrev());
lex = Collection.GotoNext();
OrderByParser gb = new OrderByParser();
gb.Parse(Collection, false);
SelectExpresion.GroupBys.Replace(gb.Columns);
if (SelectExpresion.GroupBys.Count == 0) Collection.Error("\"Group by\" columns not found", Collection.Get(idx));
lex = Collection.CurrentLexem();
}
lex = Collection.CurrentLexem();
if (lex == null) return;
if (lex.LexemText.ToLower() == "order")
{
lex = Collection.GotoNext();
if (lex == null) Collection.Error("Order by clause error", Collection.GetPrev());
if (lex.LexemText.ToLower() != "by") Collection.ErrorWaitKeyWord("BY", Collection.GetPrev());
lex = Collection.GotoNext();
OrderByParser gb = new OrderByParser();
gb.Parse(Collection, true);
SelectExpresion.OrderBys.Replace(gb.Columns.Select(a => (OrderByClause)a).ToList());
if (SelectExpresion.OrderBys.Count == 0) Collection.Error("\"Order by\" columns not found", Collection.Get(idx));
lex = Collection.CurrentLexem();
}
lex = Collection.CurrentLexem();
if (lex == null) return;
if (lex.LexemText.ToLower() == "limit")
{
lex = Collection.GotoNext();
if (lex == null) Collection.Error("Limit clause not found", Collection.GetPrev());
ExpressionParser tonode = new ExpressionParser(Collection);
tonode.Parse();
SelectExpresion.LimitRecords = tonode.Single().GetIntResultOut(null);
}
lex = Collection.CurrentLexem();
if (lex == null) return;
if (lex.LexemText.ToLower() == "offset")
{
lex = Collection.GotoNext();
if (lex == null) Collection.Error("Offset clause not found", Collection.GetPrev());
ExpressionParser tonode = new ExpressionParser(Collection);
tonode.Parse();
SelectExpresion.SkipRecords = tonode.Single().GetIntResultOut(null);
}
while (true)
{
lex = Collection.CurrentLexem();
if (lex == null) return;
string s = lex.LexemText.ToLower();
if (s == "union" || s == "intersect" || s == "except")
{
lex = Collection.GotoNextMust();
ExtSelectClause extS = new ExtSelectClause();
extS.Select = new SelectExpresion();
if (s == "union" && lex.LexemText.ToLower() == "all")
{
extS.Operation = SelectOperation.UnionAll;
lex = Collection.GotoNextMust();
}
else if (s == "union") extS.Operation = SelectOperation.Union;
if (s == "intersect") extS.Operation = SelectOperation.Intersect;
if (s == "except") extS.Operation = SelectOperation.Except;
if (lex.LexemText.ToLower() != "select") Collection.Error("\"SELECT\" clouse is not found", lex);
SelectParser sp = new SelectParser(Collection);
sp.SelectExpresion = extS.Select;
sp.Parse();
SelectExpresion.ExtSelects.Add(extS);
}
else break;
}
}
