gistfile1.txt

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;

public class WordsLoader
{
    public static int wordMaximumLength = 50;
    public static int numberOfLettersInAlphabet = 26;
    public string wordsFilename = "Words-fr.txt";

    int totalWords = 0;
    public int TotalWords
    {
        get
        {
            return totalWords;
        }
    }

    // authorized words are indexed onto their length, so if a word in the dictionary is longer than 50 characters, game will crash.
    // [0] will always be empty, but it's not a great lose of performance and better to read.. an accessor would fix it but let's keep codebase at minimum
    List<string>[] authorizedWordsForLength = new List<string>[wordMaximumLength + 1];

    List<string>[] authorizedWordsForLetter = new List<string>[numberOfLettersInAlphabet];

    bool isLoaded = false;
    public bool IsLoaded
    {
        get
        {
            return isLoaded;
        }
    }

    public List<string> getAuthorizedWordsForLength(int length)
    {
        return authorizedWordsForLength[length];
    }
    public List<string> getAuthorizedWordsForLetter(char letter)
    {
        return authorizedWordsForLetter[letter - 'a'];
    }

    public IEnumerator LoadWords(bool force = false)
    {
        if (force || !IsLoaded)
        {
            this.isLoaded = false;
            authorizedWordsForLength = new List<string>[wordMaximumLength];

            string filepath = System.IO.Path.Combine(Application.streamingAssetsPath, wordsFilename);
            if (!File.Exists(filepath))
            {
                MonoBehaviour.print("Couldn't load file: " + filepath);
                yield break;
            }
            for (int i = 0; i < numberOfLettersInAlphabet; i++)
            {
                authorizedWordsForLetter[i] = new List<string>();
            }
            using (StreamReader sr = new StreamReader(filepath))
            {
                int i = 0;
                string line;
                while ((line = sr.ReadLine()) != null && line.Length > 0)
                {
                    if (authorizedWordsForLength[line.Length] == null)
                    {
                        authorizedWordsForLength[line.Length] = new List<string>();
                    }
                    string lineLower = line.ToLower();
                    authorizedWordsForLength[line.Length].Add(lineLower);
                    authorizedWordsForLetter[lineLower[0] - 'a'].Add(lineLower);
                    if (i % 5000 == 0)
                    {
                        yield return null;
                    }
                    i++;
                }
                totalWords = i;
            }
            this.isLoaded = true;
        }
    }
}