/// <summary>
///
/// </summary>
///
/// <param name="predicate"></param>
///
public void AddPredicate(Predicate predicate)
{
predicates.Add(predicate);
}
/// <summary>
///
/// </summary>
///
public Statement Parse()
{
Statement result = new Statement();
Advance();
while (token.Token != Token.Eof)
{
switch (token.Token)
{
case Token.Select:
{
if (section == 1)
{
throw new GrammarException("incorrect syntax near the keyword 'select'.", token.Line, token.Position);
}
if (section == 0)
{
section = 1;
}
if (section != 1)
{
throw new GrammarException("incorrect syntax near the keyword 'select'.", token.Line, token.Position);
}
//Console.WriteLine("Processing SELECT");
Advance();
Projection projection = new Projection();
if (token.Token.Equals(Token.ALL))
{
Console.WriteLine("TOKEN SELECT " + token.Value);
projection.AddProperty(token.Value);
result.Projection = projection;
Advance();
break;
}
while (token.Token.Equals(Token.Comma) || token.Token.Equals(Token.Action))
{
Console.WriteLine("TOKEN SELECT " + token.Value);
projection.AddProperty(token.Value);
Advance();
}
result.Projection = projection;
break;
}
case Token.From:
{
if (section == 1)
{
section = 2;
}
if (section != 2)
{
throw new GrammarException("incorrect syntax near the keyword 'from'.", token.Line, token.Position);
}
//Console.WriteLine("processing FROM");
Advance();
if (token.Token.Equals(Token.Action))
{
Console.WriteLine("TOKEN FROM " + token.Value);
result.Type = token.Value;
}
Advance();
break;
}
case Token.Where:
{
if (section == 3)
{
throw new GrammarException("incorrect syntax near the keyword 'where'.", token.Line, token.Position);
}
if (section == 2)
{
section = 3;
}
if (section != 3)
{
throw new GrammarException("incorrect syntax near the keyword 'where'.", token.Line, token.Position);
}
//Console.WriteLine("processing WHERE");
Advance();
while (token.Token.Equals(Token.Action) ||
token.Token.Equals(Token.And) ||
token.Token.Equals(Token.Equal) ||
token.Token.Equals(Token.Quote) ||
token.Token.Equals(Token.Numeric))
{
Predicate predicate = new Predicate();
if (token.Token.Equals(Token.And))
{
Console.WriteLine("TOKEN AND ");
Advance();
}
if (token.Token.Equals(Token.Action))
{
Console.WriteLine("TOKEN WHERE " + token.Value);
predicate.Property = token.Value;
Advance();
if (token.Token.Equals(Token.Equal))
{
Console.WriteLine("TOKEN WHERE " + token.Value);
predicate.Operator = token.Value;
Advance();
}
if (token.Token.Equals(Token.Quote))
{
Console.WriteLine("TOKEN WHERE " + token.Value);
Advance();
}
if (token.Token.Equals(Token.Action))
{
Console.WriteLine("TOKEN WHERE " + token.Value);
predicate.Value = token.Value;
Advance();
}
if (token.Token.Equals(Token.Quote))
{
Console.WriteLine("TOKEN WHERE " + token.Value);
Advance();
}
if (token.Token.Equals(Token.Numeric))
{
string buffer = String.Empty;
while (token.Token.Equals(Token.Numeric))
{
buffer += token.Value;
Advance();
}
Console.WriteLine("TOKEN WHERE " + buffer);
predicate.Value = buffer;
}
}
result.AddPredicate(predicate);
}
break;
}
case Token.Retain:
{
if (section == 4)
{
throw new GrammarException("incorrect syntax near the keyword 'retain'.", token.Line, token.Position);
}
if (section == 3)
{
section = 4;
}
if (section != 4)
{
throw new GrammarException("incorrect syntax near the keyword 'retain'.", token.Line, token.Position);
}
Console.WriteLine("TOKEN RETAIN ");
Advance();
if (token.Token.Equals(Token.Numeric))
{
Console.WriteLine("TOKEN RETAIN " + token.Value);
try
{
Retention retention = new Retention(Convert.ToInt32(token.Value));
result.Retention = retention;
}
catch (Exception exception)
{
throw new GrammarException("Invalid retention value.", token.Line, token.Position);
}
Advance();
}
else
{
throw new GrammarException("Invalid retention value.", token.Line, token.Position);
}
if (!token.Token.Equals(Token.Events))
{
throw new GrammarException("incorrect syntax near: " + token.Value, token.Line, token.Position);
}
Advance();
}
break;
default:
throw new GrammarException("incorrect syntax.", token.Line, token.Position);
}
}
return result;
}