Taiji Music System Parser

void ParseConfigFiles()
{
    string configPath = Application.streamingAssetsPath;
    if(Directory.Exists(configPath))
    {
        foreach(string file in Directory.EnumerateFiles(configPath, @"*.txt", SearchOption.AllDirectories))
        {
            StreamReader sr = new StreamReader(file);
            string line = "";
            int active_line_index = 1;
            while(sr.EndOfStream == false)
            {
                stored_identifier = "";
                line = sr.ReadLine();
                line = line.TrimStart(' ', '\t'); //trim tabs and spaces
                line = line.TrimEnd(' ', '\t');
                int remainingChars = line.Length;
                bool already_added_tweak = false;
                while(remainingChars > 0)
                {
                    string token;
                    int tokenEnd = line.IndexOf(' ');
                    if(tokenEnd == -1)
                    {
                        token = line;
                        tokenEnd = line.Length;
                    }
                    else token = line.Remove(line.IndexOf(' '));
                    remainingChars -= token.Length;
                    if(tokenEnd+1 < line.Length)
                    {
                        line = line.Substring(tokenEnd+1);
                        remainingChars = line.Length;
                    }
                    else remainingChars = 0;


                    // Debug.Log("Parsing token: "+token);

                    switch(token)
                    {
                        case "#":
                            remainingChars = 0;
                        break;
                        case "zone":
                            state = states.SET_ZONE;
                        break;
                        case "layer":
                            state = states.SET_LAYER;
                        break;
                        case "add":
                            state = states.ADD_LAYER;
                        break;
                        case "tweak":
                            state = states.TWEAK;
                        break;
                        default: //identifier, action depends on current state
                            switch(state)
                            {
                                case states.SET_ZONE:
                                    MusicZone targetZone = FindMusicZone(token);
                                    bool created_new_music_zone = false;
                                    if(targetZone == null)
                                    {
                                        targetZone = new MusicZone();
                                        targetZone.name = token;
                                        created_new_music_zone = true;
                                    }
                                    if(created_new_music_zone) musicZones.Add(targetZone);
                                    else
                                    {
                                        targetZone.tweaks = new List<Tweak>();
                                        targetZone.layers = new List<MusicLayer>();
                                    }
                                    c_ActiveMusicZone = targetZone;
                                break;
                                case states.SET_LAYER:
                                    MusicLayer targetLayer = FindMusicLayer(token);
                                    if(targetLayer == null)
                                    {
                                        Debug.LogError("File: "+file+" Line: "+active_line_index+" Attempted to set a Music Layer active that does not exist! Please verify that the names match.");
                                    }
                                    else c_ActiveMusicLayer = targetLayer;
                                break;
                                case states.ADD_LAYER:
                                    MusicLayer targetLayer2 = FindMusicLayer(token);
                                    if(targetLayer2 == null)
                                    {
                                        Debug.LogError("File: "+file+" Line: "+active_line_index+" Attempted to add a music layer that does not exist! Please verify that the names match.");
                                    }
                                    if(c_ActiveMusicZone != null) c_ActiveMusicZone.layers.Add(targetLayer2);
                                break;
                                case states.TWEAK:
                                    if(already_added_tweak == false)
                                    {
                                        c_ActiveTweak = new Tweak();
                                        c_ActiveTweak.target = FindMusicLayer(token);
                                        if(c_ActiveTweak.target == null)
                                        {
                                            Debug.Log("File: "+file+" Line: "+active_line_index+" Unable to find target for tweaking \""+token+"\", perhaps it is misspelled?");
                                        }
                                        already_added_tweak = true;
                                    }
                                    else
                                    {
                                        if(c_ActiveTweak != null) //we only parse the rest of the line if we successfully found a tweak target
                                        {

                                            float value1;
                                            if(float.TryParse(token, out value1))
                                            {
                                                c_ActiveTweak.value = value1;
                                                switch(stored_identifier)
                                                {
                                                    case "osc_high_volume":
                                                        c_ActiveTweak.type = tweakType.OSC_HIGH_VOLUME;
                                                    break;
                                                    case "osc_low_volume":
                                                        c_ActiveTweak.type = tweakType.OSC_LOW_VOLUME;;
                                                    break;
                                                    case "offset_volume":
                                                        c_ActiveTweak.type = tweakType.OFFSET_VOLUME;
                                                    break;
                                                    case "blend_duration":
                                                        c_ActiveTweak.type = tweakType.BLEND_DURATION;
                                                    break;
                                                    case "wind_edge_influence":
                                                        c_ActiveTweak.type = tweakType.WIND_EDGE_INFLUENCE;
                                                    break;
                                                }
                                                if(c_ActiveMusicZone != null) c_ActiveMusicZone.tweaks.Add(c_ActiveTweak);
                                            }
                                            else stored_identifier = token;
                                        }
                                    }
                                break;
                                default:
                                    //we must assume that the token is intended to identify a variable or a value, so we will check against a list of known variable names
                                    float value;
                                    if(float.TryParse(token, out value))
                                    {
                                        switch(stored_identifier)
                                        {
                                            case "osc_frequency_low":
                                                if (c_ActiveMusicZone != null) c_ActiveMusicZone.osc_frequency_low = value;
                                            break;
                                            case "osc_frequency_high":
                                                if (c_ActiveMusicZone != null) c_ActiveMusicZone.osc_frequency_high = value;
                                            break;
                                            case "osc_transition_interval":
                                                if (c_ActiveMusicZone != null) c_ActiveMusicZone.osc_transition_interval = value;
                                            break;
                                            case "osc_transition_duration":
                                                if (c_ActiveMusicZone != null) c_ActiveMusicZone.osc_transition_duration = value;
                                            break;
                                            case "osc_low_volume":
                                                if(c_ActiveMusicLayer != null) c_ActiveMusicLayer.osc_low_volume = value;
                                            break;
                                            case "osc_high_volume":
                                                if(c_ActiveMusicLayer != null) c_ActiveMusicLayer.osc_high_volume = value;
                                            break;
                                            case "offset_volume":
                                                if(c_ActiveMusicLayer != null) c_ActiveMusicLayer.offset_volume = value;
                                            break;
                                            case "blend_duration":
                                                if(c_ActiveMusicLayer != null) c_ActiveMusicLayer.blend_duration = value;
                                            break;
                                            case "wind_edge_influence":
                                                if(c_ActiveMusicLayer != null) c_ActiveMusicLayer.wind_edge_influence = value;
                                            break;
                                            default:
                                                Debug.LogError("File: "+file+" Line: "+active_line_index+" Attempting to modify an unknown variable, please verify the name!");
                                            break;
                                        }
                                    }
                                    else stored_identifier = token;
                                break;
                            }
                        break;
                    }

                }
                state = states.DEFAULT;
                active_line_index++;
            }
            sr.Close();
        }
    }

    foreach(MusicLayer ml in musicLayers) //We mirror all the default settings so that we can restore from tweaks easily
    {
        ml.__offset_volume = ml.offset_volume;
        ml.__osc_high_volume = ml.osc_high_volume;
        ml.__osc_low_volume = ml.osc_low_volume;
        ml.__blend_duration = ml.blend_duration;
        ml.___wind_edge_influence = ml.wind_edge_influence;
    }
}