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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.Diagnostics;
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5 using System.Globalization;
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6 using System.Linq;
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7 using System.Text;
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8 using System.Threading.Tasks;
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9
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10 namespace Implab.Parsing {
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11 /// <summary>
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12 /// Алфавит символами которого являются элементы перечислений.
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13 /// </summary>
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14 /// <typeparam name="T">Тип перечислений</typeparam>
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15 public class EnumAlphabet<T> : AlphabetBase<T> where T : struct, IConvertible {
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16 static readonly T[] _symbols;
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17 static readonly EnumAlphabet<T> _fullAlphabet;
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18
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19 static EnumAlphabet() {
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20 if (!typeof(T).IsEnum)
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21 throw new InvalidOperationException("Invalid generic parameter, enumeration is required");
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22
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23 if (Enum.GetUnderlyingType(typeof(T)) != typeof(Int32))
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24 throw new InvalidOperationException("Only enums based on Int32 are supported");
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25
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26 _symbols = ((T[])Enum.GetValues(typeof(T)))
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27 .OrderBy(x => x.ToInt32(CultureInfo.InvariantCulture))
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28 .ToArray();
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29
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30 if (
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31 _symbols[_symbols.Length - 1].ToInt32(CultureInfo.InvariantCulture) >= _symbols.Length
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32 || _symbols[0].ToInt32(CultureInfo.InvariantCulture) != 0
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33 )
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34 throw new InvalidOperationException("The specified enumeration must be zero-based and continuously numbered");
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35
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36 _fullAlphabet = new EnumAlphabet<T>(_symbols.Select(x => x.ToInt32(CultureInfo.InvariantCulture)).ToArray());
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37 }
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38
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39
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40
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41 public static EnumAlphabet<T> FullAlphabet {
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42 get {
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43 return _fullAlphabet;
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44 }
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45 }
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46
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47
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48 public EnumAlphabet()
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49 : base(_symbols.Length) {
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50 }
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51
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52 public EnumAlphabet(int[] map)
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53 : base(map) {
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54 Debug.Assert(map.Length == _symbols.Length);
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55 }
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56
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57
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58 public override int GetSymbolIndex(T symbol) {
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59 return symbol.ToInt32(CultureInfo.InvariantCulture);
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60 }
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61
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62 public override IEnumerable<T> InputSymbols {
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63 get { return _symbols; }
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64 }
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65
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66 }
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67 }
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