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using Implab;
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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.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace Implab.Parsing {
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/// <summary>
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/// Indexed alphabet is the finite set of symbols where each symbol has a zero-based unique index.
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/// </summary>
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public abstract class IndexedAlphabetBase<T> : IAlphabet<T> {
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public const int UNCLASSIFIED = 0;
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int m_nextId = 1;
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readonly int[] m_map;
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public int Count {
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get { return m_nextId; }
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}
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protected IndexedAlphabetBase(int mapSize) {
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m_map = new int[mapSize];
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}
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protected IndexedAlphabetBase(int[] map) {
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Debug.Assert(map != null);
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m_map = map;
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m_nextId = map.Max() + 1;
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}
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public int DefineSymbol(T symbol) {
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var index = GetSymbolIndex(symbol);
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if (m_map[index] == UNCLASSIFIED)
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m_map[index] = m_nextId++;
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return m_map[index];
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}
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public int DefineClass(IEnumerable<T> symbols) {
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Safe.ArgumentNotNull(symbols, "symbols");
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symbols = symbols.Distinct();
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foreach (var symbol in symbols) {
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var index = GetSymbolIndex(symbol);
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if (m_map[index] == UNCLASSIFIED)
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m_map[GetSymbolIndex(symbol)] = m_nextId;
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else
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throw new InvalidOperationException(String.Format("Symbol '{0}' already in use", symbol));
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}
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return m_nextId++;
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}
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public List<T>[] CreateReverseMap() {
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return
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Enumerable.Range(UNCLASSIFIED, Count)
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.Select(
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i => InputSymbols
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.Where(x => i != UNCLASSIFIED && m_map[GetSymbolIndex(x)] == i)
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.ToList()
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)
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.ToArray();
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}
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public int[] Reclassify(IAlphabet<T> newAlphabet, IEnumerable<ICollection<int>> classes) {
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Safe.ArgumentNotNull(newAlphabet, "newAlphabet");
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Safe.ArgumentNotNull(classes, "classes");
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var reverseMap = CreateReverseMap();
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int[] translationMap = new int[Count];
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foreach (var scl in classes) {
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// skip if the supper class contains the unclassified element
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if (scl.Contains(UNCLASSIFIED))
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continue;
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var range = new List<T>();
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foreach (var cl in scl) {
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if (cl < 0 || cl >= reverseMap.Length)
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throw new ArgumentOutOfRangeException(String.Format("Class {0} is not valid for the current alphabet", cl));
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range.AddRange(reverseMap[cl]);
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}
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var newClass = newAlphabet.DefineClass(range);
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foreach (var cl in scl)
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translationMap[cl] = newClass;
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}
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return translationMap;
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}
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public virtual int Translate(T symbol) {
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return m_map[GetSymbolIndex(symbol)];
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}
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public abstract int GetSymbolIndex(T symbol);
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public abstract IEnumerable<T> InputSymbols { get; }
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/// <summary>
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/// Gets the translation map from the index of the symbol to it's class this is usefull for the optimized input symbols transtaion.
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/// </summary>
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/// <returns>The translation map.</returns>
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public int[] GetTranslationMap() {
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return m_map;
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}
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}
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}
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