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comparison Implab/Parsing/Grammar.cs @ 158:130781364799 v2

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refactoring, code cleanup
author cin
date Thu, 18 Feb 2016 14:34:02 +0300
parents c0bf853aa04f
children
comparison
equal deleted inserted replaced
157:948c015a9011 158:130781364799
9 /// <summary> 9 /// <summary>
10 /// Базовый абстрактный класс. Грамматика, позволяет формулировать выражения над алфавитом типа <c>char</c>. 10 /// Базовый абстрактный класс. Грамматика, позволяет формулировать выражения над алфавитом типа <c>char</c>.
11 /// </summary> 11 /// </summary>
12 /// <typeparam name="TGrammar"></typeparam> 12 /// <typeparam name="TGrammar"></typeparam>
13 public abstract class Grammar<TGrammar> where TGrammar: Grammar<TGrammar>, new() { 13 public abstract class Grammar<TGrammar> where TGrammar: Grammar<TGrammar>, new() {
14 Alphabet m_alphabet = new Alphabet();
15 static TGrammar _instance; 14 static TGrammar _instance;
16 15
17 public static TGrammar Instance{ 16 public static TGrammar Instance{
18 get { 17 get {
19 if (_instance == null) 18 if (_instance == null)
20 _instance = new TGrammar(); 19 _instance = new TGrammar();
21 return _instance; 20 return _instance;
22 } 21 }
23 } 22 }
24 23
24 readonly CharAlphabet m_alphabet = new CharAlphabet();
25
26 public CharAlphabet Alphabet {
27 get { return m_alphabet; }
28 }
29
25 public SymbolToken UnclassifiedToken() { 30 public SymbolToken UnclassifiedToken() {
26 return new SymbolToken(Alphabet.UNCLASSIFIED); 31 return new SymbolToken(CharAlphabet.UNCLASSIFIED);
27 } 32 }
28 33
29 public void DefineAlphabet(IEnumerable<char> alphabet) { 34 public void DefineAlphabet(IEnumerable<char> alphabet) {
30 Safe.ArgumentNotNull(alphabet, "alphabet"); 35 Safe.ArgumentNotNull(alphabet, "alphabet");
31 36
50 return SymbolToken(set); 55 return SymbolToken(set);
51 } 56 }
52 57
53 int TranslateOrAdd(char ch) { 58 int TranslateOrAdd(char ch) {
54 var t = m_alphabet.Translate(ch); 59 var t = m_alphabet.Translate(ch);
55 if (t == Alphabet.UNCLASSIFIED) 60 if (t == CharAlphabet.UNCLASSIFIED)
56 t = m_alphabet.DefineSymbol(ch); 61 t = m_alphabet.DefineSymbol(ch);
57 return t; 62 return t;
58 } 63 }
59 64
60 IEnumerable<int> TranslateOrAdd(IEnumerable<char> symbols) { 65 IEnumerable<int> TranslateOrAdd(IEnumerable<char> symbols) {
61 return symbols.Distinct().Select(TranslateOrAdd); 66 return symbols.Distinct().Select(TranslateOrAdd);
62 } 67 }
63 68
64 int TranslateOrDie(char ch) { 69 int TranslateOrDie(char ch) {
65 var t = m_alphabet.Translate(ch); 70 var t = m_alphabet.Translate(ch);
66 if (t == Alphabet.UNCLASSIFIED) 71 if (t == CharAlphabet.UNCLASSIFIED)
67 throw new ApplicationException(String.Format("Symbol '{0}' is UNCLASSIFIED", ch)); 72 throw new ApplicationException(String.Format("Symbol '{0}' is UNCLASSIFIED", ch));
68 return t; 73 return t;
69 } 74 }
70 75
71 IEnumerable<int> TranslateOrDie(IEnumerable<char> symbols) { 76 IEnumerable<int> TranslateOrDie(IEnumerable<char> symbols) {