public Query Parse(List <Match> tokens)
{
Query q = null;
RQ queue = new RQ(tokens);
int ind = queue.Step();
q = ParseCreate(queue);
if (q != null)
{
return(q);
}
queue.Restore(ind);
q = ParseDrop(queue);
if (q != null)
{
return(q);
}
queue.Restore(ind);
q = ParseSelect(queue);
if (q != null)
{
return(q);
}
queue.Restore(ind);
q = ParseInsert(queue);
if (q != null)
{
return(q);
}
queue.Restore(ind);
q = ParseUpdate(queue);
if (q != null)
{
return(q);
}
queue.Restore(ind);
q = ParseDelete(queue);
if (q != null)
{
return(q);
}
queue.Restore(ind);
throw new ParseException("Input string is not one of: create | drop | select | insert | update | delete");
}