public Grammar(Grammar g)
{
_nonterminals = new List<Nonterminal>(g.Nonterminals);
_terminals = new List<Terminal>(g.Terminals);
_rules = new List<Rule>(g.Rules);
_distinguishedSymbol = new Nonterminal(g.DistinguishedSymbol);
_vanishingSymbols = new List<Nonterminal>(g.VanishingSymbols);
}
private State _state; // текущее состояние
#endregion Fields
#region Constructors
public DescendingBacktrackAnalyzer(Grammar g)
: base(g)
{
_state = State.NORMAL;
_position = 0;
_currentString = new Stack<Symbol>();
_history = new Stack<HistoryItem>();
_orderedAlternatives = new Dictionary<string, List<Alternative>>();
_inputString = new List<Symbol>();
_altIdx = 0;
_noMoreConfigurations = false;
_configurationHistory = new StringBuilder();
}
public override Grammar read(string fname)
{
Grammar g = new Grammar();
StreamReader sr = new StreamReader(fname);
string line;
// читаем нетерминалы
List<string> nonTerms = readBlock(sr);
nonTerms.ForEach(s => g.Nonterminals.Add(new Nonterminal(s)));
// читаем терминалы
List<string> terms = readBlock(sr);
terms.ForEach(s => g.Terminals.Add(new Terminal(s)));
// читаем правила
List<string> rules = readBlock(sr);
g.Rules = parseRules(rules, terms, nonTerms);
// читаем аксиому
string axiom = readAxiom(sr);
if (!nonTerms.Contains(axiom))
throw new FormatException("Некорректный формат файла.");
g.DistinguishedSymbol = new Nonterminal(axiom);
sr.Close();
g.findVanishingSymbols();
return g;
}
public void loadGrammar(string fileName)
{
TextGrammarReader reader = new TextGrammarReader();
_grammar = reader.read(fileName);
}
public Analyzer(Grammar g)
{
_grammar = g;
}
