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1 using Implab.Automaton;
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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.Runtime.CompilerServices;
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6 using System.Text;
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7 using System.Threading.Tasks;
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8
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9 namespace Implab.Formats {
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10 public class CharMap : IAlphabet<char> {
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11 readonly char m_min;
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12 readonly char m_max;
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13 readonly int[] m_map;
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14
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15 public CharMap(char min, int[] map) {
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16 Safe.ArgumentNotNull(map, nameof(map));
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17 Count = map.Max()+1;
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18 m_min = min;
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19 m_map = map;
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20 m_max = (char)(min + map.Length);
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21 }
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22
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23 public int Count {
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24 get; private set;
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25 }
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26
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27 public bool Contains(char symbol) {
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28 return symbol >= m_min && symbol <= m_max && m_map[symbol-m_min] != AutomatonConst.UNCLASSIFIED_INPUT;
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29 }
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30
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31 public IEnumerable<char> GetSymbols(int cls) {
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32 for (var i = 0; i < m_map.Length; i++)
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33 if (m_map[i] == cls)
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34 yield return (char)(i + m_min);
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35 }
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36
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37 [MethodImpl(MethodImplOptions.AggressiveInlining)]
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38 public int Translate(char symbol) {
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39 return symbol >= m_min && symbol <= m_max ? m_map[symbol-m_min] : AutomatonConst.UNCLASSIFIED_INPUT;
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40 }
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41 }
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42 }
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