Mercurial > pub > ImplabNet
annotate Implab/Parsing/EnumAlphabet.cs @ 158:130781364799 v2
refactoring, code cleanup
| author | cin |
|---|---|
| date | Thu, 18 Feb 2016 14:34:02 +0300 |
| parents | 97fbbf816844 |
| children |
| rev | line source |
|---|---|
|
156
97fbbf816844
Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
65
diff
changeset
|
1 using System; |
| 55 | 2 using System.Collections.Generic; |
| 59 | 3 using System.Diagnostics; |
| 55 | 4 using System.Globalization; |
| 5 using System.Linq; | |
|
156
97fbbf816844
Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
65
diff
changeset
|
6 using System.Diagnostics.CodeAnalysis; |
| 55 | 7 |
| 8 namespace Implab.Parsing { | |
| 9 /// <summary> | |
| 10 /// Алфавит символами которого являются элементы перечислений. | |
| 11 /// </summary> | |
| 12 /// <typeparam name="T">Тип перечислений</typeparam> | |
| 158 | 13 public class EnumAlphabet<T> : IndexedAlphabetBase<T> where T : struct, IConvertible { |
|
156
97fbbf816844
Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
65
diff
changeset
|
14 [SuppressMessage("Microsoft.Design", "CA1000:DoNotDeclareStaticMembersOnGenericTypes")] |
| 55 | 15 static readonly T[] _symbols; |
| 16 static readonly EnumAlphabet<T> _fullAlphabet; | |
| 17 | |
|
156
97fbbf816844
Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
65
diff
changeset
|
18 [SuppressMessage("Microsoft.Design", "CA1065:DoNotRaiseExceptionsInUnexpectedLocations")] |
| 55 | 19 static EnumAlphabet() { |
| 20 if (!typeof(T).IsEnum) | |
| 21 throw new InvalidOperationException("Invalid generic parameter, enumeration is required"); | |
| 22 | |
| 23 if (Enum.GetUnderlyingType(typeof(T)) != typeof(Int32)) | |
| 24 throw new InvalidOperationException("Only enums based on Int32 are supported"); | |
| 25 | |
| 26 _symbols = ((T[])Enum.GetValues(typeof(T))) | |
| 27 .OrderBy(x => x.ToInt32(CultureInfo.InvariantCulture)) | |
| 28 .ToArray(); | |
| 29 | |
| 30 if ( | |
| 31 _symbols[_symbols.Length - 1].ToInt32(CultureInfo.InvariantCulture) >= _symbols.Length | |
| 32 || _symbols[0].ToInt32(CultureInfo.InvariantCulture) != 0 | |
| 33 ) | |
| 34 throw new InvalidOperationException("The specified enumeration must be zero-based and continuously numbered"); | |
| 35 | |
| 36 _fullAlphabet = new EnumAlphabet<T>(_symbols.Select(x => x.ToInt32(CultureInfo.InvariantCulture)).ToArray()); | |
| 37 } | |
| 38 | |
| 39 | |
| 40 | |
| 41 public static EnumAlphabet<T> FullAlphabet { | |
| 42 get { | |
| 43 return _fullAlphabet; | |
| 44 } | |
| 45 } | |
| 46 | |
| 47 | |
| 48 public EnumAlphabet() | |
| 59 | 49 : base(_symbols.Length) { |
| 55 | 50 } |
| 51 | |
| 52 public EnumAlphabet(int[] map) | |
| 53 : base(map) { | |
| 59 | 54 Debug.Assert(map.Length == _symbols.Length); |
| 55 | 55 } |
| 56 | |
| 57 | |
| 58 public override int GetSymbolIndex(T symbol) { | |
| 59 return symbol.ToInt32(CultureInfo.InvariantCulture); | |
| 60 } | |
| 61 | |
| 62 public override IEnumerable<T> InputSymbols { | |
| 63 get { return _symbols; } | |
| 64 } | |
| 65 | |
| 66 } | |
| 67 } |