public BnfExpression MakeStarRule(NonTerminal listNonTerminal, BnfTerm delimiter, BnfTerm listMember)
{
if (delimiter == null)
{
//it is much simpler case
listNonTerminal.SetOption(TermOptions.IsList);
listNonTerminal.Rule = Empty | listNonTerminal + listMember;
return(listNonTerminal.Rule);
}
NonTerminal tmp = new NonTerminal(listMember.Name + "+");
MakePlusRule(tmp, delimiter, listMember);
listNonTerminal.Rule = Empty | tmp;
listNonTerminal.SetOption(TermOptions.IsStarList);
return(listNonTerminal.Rule);
}
public NonTerminal Plus()
{
if (_plus != null)
{
return(_plus);
}
string name = this.Name + "+";
_plus = new NonTerminal(name);
_plus.SetOption(TermOptions.IsList);
_plus.Rule = this | _plus + this;
return(_plus);
}
public NonTerminal Star()
{
if (_star != null)
{
return(_star);
}
string name = this.Name + "*";
_star = new NonTerminal(name);
_star.SetOption(TermOptions.IsList);
_star.Rule = Grammar.Empty | _star + this;
return(_star);
}
public BnfExpression MakePlusRule(NonTerminal listNonTerminal, BnfTerm delimiter, BnfTerm listMember)
{
listNonTerminal.SetOption(TermOptions.IsList);
if (delimiter == null)
{
listNonTerminal.Rule = listMember | listNonTerminal + listMember;
}
else
{
listNonTerminal.Rule = listMember | listNonTerminal + delimiter + listMember;
}
return(listNonTerminal.Rule);
}
