Mercurial > pub > ImplabNet

comparison Implab/Automaton/EnumAlphabet.cs @ 190:1c2a16d071a7 v2

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Слияние с ref20160224
author cin
date Fri, 22 Apr 2016 13:08:08 +0300
parents c32688129f14
children
comparison
equal deleted inserted replaced
161:2a8466f0cb8a 190:1c2a16d071a7
1 using System;
2 using System.Collections.Generic;
3 using System.Diagnostics;
4 using System.Globalization;
5 using System.Linq;
6 using System.Diagnostics.CodeAnalysis;
7
8 namespace Implab.Automaton {
9 /// <summary>
10 /// Алфавит символами которого являются элементы перечислений.
11 /// </summary>
12 /// <typeparam name="T">Тип перечислений</typeparam>
13 public class EnumAlphabet<T> : IndexedAlphabetBase<T> where T : struct, IConvertible {
14 [SuppressMessage("Microsoft.Design", "CA1000:DoNotDeclareStaticMembersOnGenericTypes")]
15 static readonly Lazy<T[]> _symbols = new Lazy<T[]>(GetSymbols);
16
17 [SuppressMessage("Microsoft.Design", "CA1000:DoNotDeclareStaticMembersOnGenericTypes")]
18 static readonly Lazy<EnumAlphabet<T>> _fullAlphabet = new Lazy<EnumAlphabet<T>>(CreateEnumAlphabet);
19
20 static EnumAlphabet<T> CreateEnumAlphabet() {
21 var symbols = _symbols.Value;
22
23 if (
24 symbols[symbols.Length - 1].ToInt32(CultureInfo.InvariantCulture) >= symbols.Length
25 || symbols[0].ToInt32(CultureInfo.InvariantCulture) != 0
26 )
27 throw new InvalidOperationException("The specified enumeration must be zero-based and continuously numbered");
28
29 return new EnumAlphabet<T>(symbols.Select(x => x.ToInt32(CultureInfo.InvariantCulture)).ToArray());
30 }
31
32 static T[] GetSymbols() {
33 if (!typeof(T).IsEnum)
34 throw new InvalidOperationException("Invalid generic parameter, enumeration is required");
35
36 if (Enum.GetUnderlyingType(typeof(T)) != typeof(Int32))
37 throw new InvalidOperationException("Only enums based on Int32 are supported");
38
39 return ((T[])Enum.GetValues(typeof(T)))
40 .OrderBy(x => x.ToInt32(CultureInfo.InvariantCulture))
41 .ToArray();
42 }
43
44 public static EnumAlphabet<T> FullAlphabet {
45 get {
46 return _fullAlphabet.Value;
47 }
48 }
49
50
51 public EnumAlphabet()
52 : base(_symbols.Value.Length) {
53 }
54
55 public EnumAlphabet(int[] map)
56 : base(map) {
57 Debug.Assert(map.Length == _symbols.Value.Length);
58 }
59
60
61 public override int GetSymbolIndex(T symbol) {
62 return symbol.ToInt32(CultureInfo.InvariantCulture);
63 }
64
65 }
66 }