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162
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1 using Implab;
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2 using System;
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3 using System.Collections.Generic;
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4 using System.Linq;
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5 using System.Text;
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6 using System.Threading.Tasks;
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7
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8 namespace Implab.Automaton.RegularExpressions {
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9 /// <summary>
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10 /// Базовый абстрактный класс. Грамматика, позволяет формулировать выражения над алфавитом типа <c>char</c>.
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11 /// </summary>
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163
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12 public abstract class Grammar<TSymbol, TTag> {
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162
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13
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14 public abstract IAlphabetBuilder<TSymbol> Alphabet {
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15 get;
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162
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16 }
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17
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18 public SymbolToken<TTag> UnclassifiedToken() {
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19 return new SymbolToken<TTag>(DFAConst.UNCLASSIFIED_INPUT);
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162
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20 }
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21
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163
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22 public void DefineAlphabet(IEnumerable<TSymbol> alphabet) {
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162
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23 Safe.ArgumentNotNull(alphabet, "alphabet");
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24
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25 foreach (var ch in alphabet)
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163
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26 Alphabet.DefineSymbol(ch);
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162
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27 }
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28
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29 public Token<TTag> SymbolToken(TSymbol symbol) {
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30 return Token<TTag>.New(TranslateOrAdd(symbol));
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162
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31 }
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32
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163
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33 public Token<TTag> SymbolToken(IEnumerable<TSymbol> symbols) {
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34 Safe.ArgumentNotNull(symbols, "symbols");
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35
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36 return Token<TTag>.New(TranslateOrAdd(symbols).ToArray());
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162
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37 }
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38
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163
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39 public Token<TTag> SymbolSetToken(params TSymbol[] set) {
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162
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40 return SymbolToken(set);
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41 }
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42
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43 int TranslateOrAdd(TSymbol ch) {
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44 var t = Alphabet.Translate(ch);
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45 if (t == DFAConst.UNCLASSIFIED_INPUT)
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46 t = Alphabet.DefineSymbol(ch);
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162
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47 return t;
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48 }
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49
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50 IEnumerable<int> TranslateOrAdd(IEnumerable<TSymbol> symbols) {
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51 return symbols.Distinct().Select(TranslateOrAdd);
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52 }
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53
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54 int TranslateOrDie(TSymbol ch) {
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55 var t = Alphabet.Translate(ch);
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56 if (t == DFAConst.UNCLASSIFIED_INPUT)
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162
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57 throw new ApplicationException(String.Format("Symbol '{0}' is UNCLASSIFIED", ch));
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58 return t;
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59 }
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60
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163
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61 IEnumerable<int> TranslateOrDie(IEnumerable<TSymbol> symbols) {
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62 return symbols.Distinct().Select(TranslateOrDie);
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63 }
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64
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65 public Token<TTag> SymbolTokenExcept(IEnumerable<TSymbol> symbols) {
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66 Safe.ArgumentNotNull(symbols, "symbols");
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67
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68 return Token<TTag>.New( Enumerable.Range(0, Alphabet.Count).Except(TranslateOrDie(symbols)).ToArray() );
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69 }
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70
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163
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71 protected CDFADefinition BuildDFA(Token<TTag> lang) {
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162
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72 Safe.ArgumentNotNull(lang, "lang");
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73
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74 var dfa = new RegularDFADefinition<TSymbol, TTag>(Alphabet, 0);
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75
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76 var table = new DFATransitionTable<TTag>();
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77
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163
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78 var builder = new RegularDFABuilder<TTag>();
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162
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79
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80 lang.Accept( builder );
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81
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82 var initialState = builder.BuildDFA(table);
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83 if (table.IsFinalState(initialState))
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84 throw new ApplicationException("The specified language contains empty token");
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85
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86 return dfa.Optimize();
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87 }
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88
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89
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90
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91 //protected abstract TGrammar CreateInstance();
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92 }
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93
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94
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95 }
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