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163
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4
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5 namespace Implab.Automaton {
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6 public class MapAlphabet<T> : IAlphabetBuilder<T> {
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7 readonly Dictionary<T,int> m_map;
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171
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8 int m_nextCls;
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9 readonly bool m_supportUnclassified;
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164
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10
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171
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11 public MapAlphabet(bool supportUnclassified, IEqualityComparer<T> comparer) {
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12 m_map = comparer != null ? new Dictionary<T, int>(comparer) : new Dictionary<T,int>();
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13 m_supportUnclassified = supportUnclassified;
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14 m_nextCls = supportUnclassified ? 1 : 0;
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163
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15 }
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16
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17 #region IAlphabetBuilder implementation
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18
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19 public int DefineSymbol(T symbol) {
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20 int cls;
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171
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21 return m_map.TryGetValue(symbol, out cls) ? cls : DefineSymbol(symbol, m_nextCls);
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22 }
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163
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23
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171
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24 public int DefineSymbol(T symbol, int cls) {
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25 Safe.ArgumentAssert(cls >= 0, "cls");
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163
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26
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171
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27 m_nextCls = Math.Max(cls + 1, m_nextCls);
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163
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28 m_map.Add(symbol, cls);
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29 return cls;
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30 }
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31
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32 public int DefineClass(IEnumerable<T> symbols) {
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171
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33 return DefineClass(symbols, m_nextCls);
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34 }
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35
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36 public int DefineClass(IEnumerable<T> symbols, int cls) {
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37 Safe.ArgumentAssert(cls >= 0, "cls");
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163
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38 Safe.ArgumentNotNull(symbols, "symbols");
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171
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39
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40 m_nextCls = Math.Max(cls + 1, m_nextCls);
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163
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41
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171
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42 foreach (var symbol in symbols)
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43 m_map[symbol] = cls;
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44 return cls;
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163
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45 }
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46
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47 #endregion
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48
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49 #region IAlphabet implementation
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50
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171
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51 public int Translate(T symbol) {
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163
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52 int cls;
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171
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53 if (m_map.TryGetValue(symbol, out cls))
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54 return cls;
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55 if (!m_supportUnclassified)
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56 throw new ArgumentOutOfRangeException("symbol", "The specified symbol isn't in the alphabet");
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178
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57 return AutomatonConst.UNCLASSIFIED_INPUT;
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163
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58 }
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59
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60 public int Count {
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61 get {
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62 return m_nextCls;
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63 }
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64 }
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65
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171
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66 public bool Contains(T symbol) {
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67 return m_supportUnclassified || m_map.ContainsKey(symbol);
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68 }
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69
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172
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70
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71 public IEnumerable<T> GetSymbols(int cls) {
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181
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72 Safe.ArgumentAssert(!m_supportUnclassified || cls > 0, "cls");
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172
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73 return m_map.Where(p => p.Value == cls).Select(p => p.Key);
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74 }
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163
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75 #endregion
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176
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76
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77 public IEnumerable<KeyValuePair<T,int>> Mappings {
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78 get {
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79 return m_map;
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80 }
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81 }
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163
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82 }
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83 }
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84
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