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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Globalization;
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using System.Linq;
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using System.Diagnostics.CodeAnalysis;
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namespace Implab.Parsing {
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/// <summary>
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/// Алфавит символами которого являются элементы перечислений.
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/// </summary>
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/// <typeparam name="T">Тип перечислений</typeparam>
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public class EnumAlphabet<T> : IndexedAlphabetBase<T> where T : struct, IConvertible {
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[SuppressMessage("Microsoft.Design", "CA1000:DoNotDeclareStaticMembersOnGenericTypes")]
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static readonly T[] _symbols;
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static readonly EnumAlphabet<T> _fullAlphabet;
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[SuppressMessage("Microsoft.Design", "CA1065:DoNotRaiseExceptionsInUnexpectedLocations")]
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static EnumAlphabet() {
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if (!typeof(T).IsEnum)
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throw new InvalidOperationException("Invalid generic parameter, enumeration is required");
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if (Enum.GetUnderlyingType(typeof(T)) != typeof(Int32))
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throw new InvalidOperationException("Only enums based on Int32 are supported");
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_symbols = ((T[])Enum.GetValues(typeof(T)))
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.OrderBy(x => x.ToInt32(CultureInfo.InvariantCulture))
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.ToArray();
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if (
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_symbols[_symbols.Length - 1].ToInt32(CultureInfo.InvariantCulture) >= _symbols.Length
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|| _symbols[0].ToInt32(CultureInfo.InvariantCulture) != 0
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)
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throw new InvalidOperationException("The specified enumeration must be zero-based and continuously numbered");
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_fullAlphabet = new EnumAlphabet<T>(_symbols.Select(x => x.ToInt32(CultureInfo.InvariantCulture)).ToArray());
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}
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public static EnumAlphabet<T> FullAlphabet {
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get {
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return _fullAlphabet;
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}
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}
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public EnumAlphabet()
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: base(_symbols.Length) {
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}
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public EnumAlphabet(int[] map)
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: base(map) {
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Debug.Assert(map.Length == _symbols.Length);
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}
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public override int GetSymbolIndex(T symbol) {
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return symbol.ToInt32(CultureInfo.InvariantCulture);
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}
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public override IEnumerable<T> InputSymbols {
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get { return _symbols; }
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}
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}
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}
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