/// <summary>
/// Make grammar rule according to regex plus notation (with optional delimiter)
/// </summary>
/// <param name="rule">Rule where plus notation is applied</param>
/// <param name="delimiter">Delimiter of rule occurances</param>
/// <returns>Created rule</returns>
protected GrammarRule MakePlusRule(GrammarRule rule, GrammarRule delimiter = null)
{
var T = new NonTerminal(null);
if (delimiter == null)
{
T.Rule = rule | (T + rule);
}
else
{
T.Rule = rule | (T + delimiter + rule);
}
return(T);
}
/// <summary>
/// Make grammar rule according to regex start notation (with optional delimiter)
/// </summary>
/// <param name="rule">Rule where star notation is applied</param>
/// <param name="delimiter">Delimiter of rule occurances</param>
/// <returns>Created rule</returns>
protected GrammarRule MakeStarRule(GrammarRule rule, GrammarRule delimiter = null)
{
return(Q(MakePlusRule(rule, delimiter)));
}
/// <summary>
/// Set grammar rule as optional (Question mark notation)
/// </summary>
/// <param name="rule">Rule that can be ommited in grammar</param>
/// <returns>Created rule</returns>
protected GrammarRule Q(GrammarRule rule)
{
return(rule | Empty);
}
