public Node[] Parse(string command)
{
List <Node> tokens = new List <Node>();
var tokenReader = new SQLiteTokenReader((command + "").Trim());
if (tokenReader.EqualTo(SelectWord))
{
ParseSelectOrGroupBy(tokenReader, tokens);
}
return(tokens.ToArray());
}
private void ParseTableName(SQLiteTokenReader tokenReader, List <Node> tokens)
{
if (tokenReader.Current.StartsWith("`"))
{
// name of column...
string data1 = tokenReader.Current.Substring(1, tokenReader.Current.Length - 2);
string data2 = "";
tokenReader.MoveNext();
if (tokenReader.Current.StartsWith("."))
{
tokenReader.MoveNext();
if (tokenReader.Current.StartsWith("`"))
{
data2 = tokenReader.Current.Substring(1, tokenReader.Current.Length - 2);
tokenReader.MoveNext();
tokens.Add(new NodeString2()
{
Code = JSqlOpCodes.FromField, Data1 = data1, Data2 = data2
});
}
else
{
throw new Exception("Expected ` after . in from");
}
}
else
{
tokens.Add(new NodeString()
{
Code = JSqlOpCodes.FromField, Data1 = data1
});
}
}
else
{
throw new Exception("Expected Value or Literal or Argument");
}
}
private void ParseExpression(SQLiteTokenReader tokenReader, List <Node> tokens, bool isHaving = false, bool isGroupBy = false, bool isOnClause = false)
{
tokenReader.MoveNext();
if (tokenReader.EqualTo(SelectWord))
{
if (isHaving)
{
throw new Exception("Cannot have select in a having clause!");
}
if (isGroupBy)
{
throw new Exception("Cannot have select in a group by clause!");
}
if (isOnClause)
{
throw new Exception("Cannot have select in a on clause!");
}
ParseSelectOrGroupBy(tokenReader, tokens);
}
else
{
do
{
if (tokenReader.EqualTo("("))
{
// start of epxression...
tokens.Add(new Node()
{
Code = JSqlOpCodes.OpenBrackets
});
ParseExpression(tokenReader, tokens, isHaving);
if (!tokenReader.EqualTo(")"))
{
throw new Exception("Expected closing ')'");
}
else
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.CloseBrackets
});
tokenReader.MoveNext();
}
}
else
{
ParseVarOrLit(tokenReader, tokens);
}
if (tokenReader.CanMoveNext)
{
if (!isOnClause && !isHaving && !isGroupBy && tokenReader.EqualTo(GroupWord, GroupByWord))
{
ParseSelectOrGroupBy(tokenReader, tokens, true);
return;
}
else if (!isOnClause && !isHaving && tokenReader.EqualTo(HavingWord))
{
ParseWhereOrHaving(tokenReader, tokens, true);
return;
}
else if (tokenReader.EqualTo(")"))
{
// inside expression.
return;
}
else
{
int prevpos = tokenReader._pos;
ParseSymbol(tokenReader, tokens);
if (tokenReader._pos == prevpos)
{
if (isOnClause)
{
return;
}
else
{
throw new Exception("Expected , or ; or from!");
}
}
}
}
else
{
return;
}
}while (true);
}
}
private bool ParseVarOrLit(SQLiteTokenReader tokenReader, List <Node> tokens)
{
if (tokenReader.Current.StartsWith("`"))
{
// name of column...
string data1 = tokenReader.Current.Substring(1, tokenReader.Current.Length - 2);
string data2 = "";
string data3 = "";
tokenReader.MoveNext();
if (tokenReader.Current == ".")
{
tokenReader.MoveNext();
if (tokenReader.Current.StartsWith("`"))
{
data2 = tokenReader.Current.Substring(1, tokenReader.Current.Length - 2);
tokenReader.MoveNext();
if (tokenReader.Current == ".")
{
tokenReader.MoveNext();
if (tokenReader.Current.StartsWith("`"))
{
data3 = tokenReader.Current.Substring(1, tokenReader.Current.Length - 2);
tokenReader.MoveNext();
tokens.Add(new NodeString3()
{
Code = JSqlOpCodes.SelectName,
Data1 = data3,
Data2 = data2,
Data3 = data1
});
}
else
{
throw new Exception("Expected ` after .");
}
}
else
{
tokens.Add(new NodeString2()
{
Code = JSqlOpCodes.SelectName,
Data1 = data2,
Data2 = data1,
});
}
}
else
{
throw new Exception("Expected ` after .");
}
}
else
{
tokens.Add(new NodeString()
{
Code = JSqlOpCodes.SelectName,
Data1 = data1
});
}
return(true);
}
else if (tokenReader.Current.StartsWith("'"))
{
tokens.Add(new NodeString()
{
Code = JSqlOpCodes.SelectString,
Data1 = tokenReader.Current.Substring(1, tokenReader.Current.Length - 2)
});
}
else if (tokenReader.IsNumberLiteral())
{
// add literal.
tokens.Add(new NodeNumber()
{
Code = JSqlOpCodes.SelectNumber, Number1 = tokenReader.GetValue()
});
}
else if (tokenReader.Current.StartsWith("@"))
{
// add argument placement.
tokens.Add(new NodeString()
{
Code = JSqlOpCodes.ArgumentPlacement, Data1 = tokenReader.Current.Substring(1)
});
}
else
{
throw new Exception("Expected Value or Literal or Argument");
}
tokenReader.MoveNext();
return(false);
}
private void ParseSelectOrGroupBy(SQLiteTokenReader tokenReader, List <Node> tokens, bool isGroupBy = false)
{
tokenReader.MoveNext();
if (isGroupBy)
{
tokenReader.MoveNext();
tokens.Add(new Node()
{
Code = JSqlOpCodes.GroupClause
});
}
else
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.SelectClause
});
}
bool skip = false;
// we need to long all items....
do
{
if (!skip)
{
if (tokenReader.EqualTo("("))
{
// start of epxression...
tokens.Add(new Node()
{
Code = JSqlOpCodes.OpenBrackets
});
ParseExpression(tokenReader, tokens, false, isGroupBy);
if (!tokenReader.EqualTo(")"))
{
throw new Exception("Expected closing ')'");
}
else
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.CloseBrackets
});
tokenReader.MoveNext();
}
}
else if (!isGroupBy && tokenReader.EqualTo("*"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.SelectAll
});
tokenReader.MoveNext();
}
else
{
ParseVarOrLit(tokenReader, tokens);
}
}
else
{
skip = false;
}
if (tokenReader.CanMoveNext)
{
if (!isGroupBy && tokenReader.EqualTo(FromWord))
{
ParseFrom(tokenReader, tokens);
return;
}
else if (isGroupBy && tokenReader.EqualTo(HavingWord))
{
ParseWhereOrHaving(tokenReader, tokens, true);
return;
}
else if (tokenReader.EqualTo(","))
{
// continue;
tokenReader.MoveNext();
}
else if (!isGroupBy && tokenReader.Current.StartsWith("`"))
{
tokens.Add(new NodeString()
{
Code = JSqlOpCodes.Alias, Data1 = tokenReader.Current.Substring(1, tokenReader.Current.Length - 2)
});
tokenReader.MoveNext();
skip = true;
}
else if (tokenReader.EqualTo(";"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.EndOfQuery
});
tokenReader.MoveNext();
return;
}
else if (tokenReader.EqualTo(")"))
{
// inside expression.
return;
}
else
{
int prevpos = tokenReader._pos;
ParseSymbol(tokenReader, tokens);
if (tokenReader._pos == prevpos)
{
throw new Exception("Expected , or ; or from!");
}
}
}
else
{
return;
}
}while (true);
}
private bool ParseWhereOrHaving(SQLiteTokenReader tokenReader, List <Node> tokens, bool isHaving = false, bool isOnClause = false)
{
tokenReader.MoveNext();
if (isOnClause)
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.OnClause
});
}
else
{
if (isHaving)
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.HavingClause
});
}
else
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.WhereClause
});
}
}
do
{
if (tokenReader.EqualTo("("))
{
// start of epxression...
tokens.Add(new Node()
{
Code = JSqlOpCodes.OpenBrackets
});
ParseExpression(tokenReader, tokens, isHaving, isOnClause);
if (!tokenReader.EqualTo(")"))
{
throw new Exception("Expected closing ')'");
}
else
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.CloseBrackets
});
tokenReader.MoveNext();
}
}
else
{
ParseVarOrLit(tokenReader, tokens);
}
if (tokenReader.CanMoveNext)
{
if (!isOnClause && !isHaving && tokenReader.EqualTo(GroupWord, GroupByWord))
{
ParseSelectOrGroupBy(tokenReader, tokens);
return(false);
}
else if (!isOnClause && !isHaving && tokenReader.EqualTo(HavingWord))
{
ParseWhereOrHaving(tokenReader, tokens, true);
return(false);
}
else if (tokenReader.EqualTo(")"))
{
// inside expression.
return(false);
}
else
{
int prevpos = tokenReader._pos;
if (ParseSymbol(tokenReader, tokens))
{
// finished
return(true);
}
if (tokenReader._pos == prevpos)
{
if (isOnClause)
{
// process in caller!
return(false);
}
else
{
if (isHaving)
{
throw new Exception("Expected , or ;");
}
else
{
throw new Exception("Expected , or ; or Group By or Having!");
}
}
}
}
}
else
{
return(false);
}
}while (true);
}
private void ParseFrom(SQLiteTokenReader tokenReader, List <Node> tokens)
{
tokenReader.MoveNext();
tokens.Add(new Node()
{
Code = JSqlOpCodes.FromClause
});
bool skip = false;
do
{
if (!skip)
{
if (tokenReader.EqualTo("("))
{
// start of epxression...
tokens.Add(new Node()
{
Code = JSqlOpCodes.OpenBrackets
});
ParseExpression(tokenReader, tokens);
if (!tokenReader.EqualTo(")"))
{
throw new Exception("Expected closing ')'");
}
else
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.CloseBrackets
});
tokenReader.MoveNext();
}
if (tokenReader.EqualTo("`"))
{
tokens.Add(new NodeString()
{
Code = JSqlOpCodes.Alias, Data1 = tokenReader.Current.Substring(1, tokenReader.Current.Length - 2)
});
tokenReader.MoveNext();
}
else
{
throw new Exception("From Clause on Expression needs Alias!");
}
}
else
{
ParseTableName(tokenReader, tokens);
}
}
else
{
skip = false;
}
if (tokenReader.CanMoveNext)
{
if (tokenReader.EqualTo(WhereWord))
{
ParseWhereOrHaving(tokenReader, tokens);
return;
}
else if (tokenReader.EqualTo(GroupWord, GroupByWord))
{
ParseSelectOrGroupBy(tokenReader, tokens, true);
return;
}
else if (tokenReader.EqualTo(HavingWord))
{
ParseWhereOrHaving(tokenReader, tokens, true);
return;
}
else if (tokenReader.EqualTo(InnerWord, JoinWord))
{
// continue;
tokens.Add(new Node()
{
Code = JSqlOpCodes.InnerJoin
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo(LeftWord, JoinWord))
{
// continue;
tokens.Add(new Node()
{
Code = JSqlOpCodes.LeftJoin
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo(RightWord, JoinWord))
{
// continue;
tokens.Add(new Node()
{
Code = JSqlOpCodes.RightJoin
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo(OuterWord, JoinWord))
{
// continue;
tokens.Add(new Node()
{
Code = JSqlOpCodes.OuterJoin
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo(OnWord))
{
// continue;
if (ParseWhereOrHaving(tokenReader, tokens, false, true))
{
return;
}
}
else if (tokenReader.EqualTo(","))
{
// continue;
tokenReader.MoveNext();
}
else if (tokenReader.Current.StartsWith("`"))
{
tokens.Add(new NodeString()
{
Code = JSqlOpCodes.Alias, Data1 = tokenReader.Current.Substring(1, tokenReader.Current.Length - 2)
});
tokenReader.MoveNext();
skip = true;
}
else if (tokenReader.EqualTo(";"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.EndOfQuery
});
tokenReader.MoveNext();
return;
}
else if (tokenReader.EqualTo(")"))
{
// inside expression.
return;
}
else
{
throw new Exception("Expected , or ; or from!");
}
}
else
{
return;
}
}while (true);
}
private bool ParseSymbol(SQLiteTokenReader tokenReader, List <Node> tokens)
{
if (tokenReader.EqualTo("+"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Plus
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo("-"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Minus
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo("/"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Div
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo("*"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Mul
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo(">"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Larger
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo("<"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Smaller
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo("="))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Equal
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo("<", ">") || tokenReader.EqualTo("!", "="))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.NotEqual
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo("|") || tokenReader.EqualTo("or"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Or
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo("^"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.BitWiseOr
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo("&") || tokenReader.EqualTo("and"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.And
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo("%"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Mod
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo("&", "&"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.And
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo("|", "|"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Or
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo(">", "="))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.LargerEqual
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo("<", "="))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.SmallerEqual
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo(">", ">"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.BitShiftRight
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo("<", "<"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.BitShiftLeft
});
tokenReader.MoveNext(2);
}
else if (tokenReader.EqualTo("!") || tokenReader.EqualTo("not"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.Not
});
tokenReader.MoveNext();
}
else if (tokenReader.EqualTo(";"))
{
tokens.Add(new Node()
{
Code = JSqlOpCodes.EndOfQuery
});
if (tokenReader.CanMoveNext)
{
tokenReader.MoveNext();
}
return(true);
}
return(false);
}
