configManagement.cpp

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#include <fstream>
#include "game.h"
#include "configManagement.h"
#include "errors.h"
 
 
void trimSpaces(string& str){
    str.erase(0, str.find_first_not_of(' '));
}
 
void sanitizeValue(string& val) {
    trimSpaces(val);
    for (char c: {'\'', '"'}) {
        if (val[0] == c && val[val.size() - 1] == c) {
            val.erase(val.begin());
            val.pop_back();
            break;
        }
    }
}
 
void ConfigBuilder::dumpInternalValues() const {
    for(const auto& ite : internalValues){
        cerr << ite.first << " -> " << ite.second << endl;
    }
}
 
/* WARNING : This implementation of YAML is not meant to be complete, but to work with our specific needs
 * It also can't detect and report errors in a non-YAML-compliant file*/
 
void ConfigBuilder::parseFile(const string& fname) {
    ifstream file(fname);
    if(!file.is_open())throw config_error("Error while opening config.yml. Check file location ?");
 
    vector<string> keyParts;
    unsigned listIndex;
    unsigned lineno = 0; // for error handling purposes
    while (!file.eof()) {
        string line;
        getline(file, line);
        ++lineno;
        auto match = line.find('#');
        if (match != string::npos)line.erase(match);
        if (line.find_first_not_of(' ')==string::npos)continue;
 
        unsigned currentIndent = 0;
        while (line[currentIndent] == ' ')++currentIndent;
 
        if(line[currentIndent]=='-'){
            string value = line.substr(currentIndent+1);
            sanitizeValue(value);
 
            string fullKey;
            for (unsigned i = 0; i < currentIndent; ++i) {
                fullKey.append(keyParts[i]);
                fullKey.append(".");
            }
            // lists are just treated as sections with key 0,1,2...
            fullKey.append(to_string((listIndex)));
            ++listIndex;
            internalValues[fullKey] = value;
 
        }else{
            match = line.find(':');
            if (match == string::npos)throw config_error("Line "+ to_string(lineno)+" invalid : |"+line+"|");
            string key = line.substr(0, match);
            string value = line.substr(match + 1);
            trimSpaces(key);
            sanitizeValue(value);
            if (value.empty()) {
                keyParts.resize(currentIndent);
                keyParts.push_back(key);
                listIndex = 0;
            } else {
                string fullKey;
                for (unsigned i = 0; i < currentIndent; ++i) {
                    fullKey.append(keyParts[i]);
                    fullKey.append(".");
                }
                fullKey.append(key);
                internalValues[fullKey] = value;
            }
        }
    }
 
    file.close();
}
 
void ConfigBuilder::readGrid(const configKey& baseKey) {
    vector<string> tmp;
    getList("grid", tmp);
 
    // we are essentially going to translate a line-oriented config to a column-oriented grid
 
    unsigned maxSize = 0;
    for(string& s : tmp){
        if(s.size()>maxSize)maxSize = s.size();
    }
    collectedData.grid.resize(maxSize);
 
    for(string& s : tmp){
        unsigned i=0;
        for(;i<s.size();++i){
            switch(toupper(s[i])){
                case 'A':{
                    collectedData.grid[i].push_back(InvaderType::TYPEA);
                    break;
                }
                case 'B':{
                    collectedData.grid[i].push_back(InvaderType::TYPEB);
                    break;
                }
                case 'C':{
                    collectedData.grid[i].push_back(InvaderType::TYPEC);
                    break;
                }
                case ' ':{
                    collectedData.grid[i].push_back(InvaderType::NONE);
                    break;
                }
                default:{
                    throw config_error("Invalid invader ID in grid definition : "+ to_string(s[i]));
                }
            }
        }
        while(i<maxSize){
            collectedData.grid[i].push_back(InvaderType::NONE);
            ++i;
        }
    }
}
 
void ConfigBuilder::readPlayer(const configKey& baseKey, PlayerDef& pdef) {
    getColor(baseKey+".color", pdef.color);
    pdef.keys.left = getChar(baseKey+".keys.left");
    pdef.keys.right = getChar(baseKey+".keys.right");
    pdef.keys.shoot = getChar(baseKey+".keys.shoot");
}
 
void ConfigBuilder::readInvaderType(const configKey& baseKey, InvaderTypeDef& invDef) {
    invDef.points = getInt(baseKey+".points");
    getColor(baseKey+".color", invDef.color);
}
 
void ConfigBuilder::readConfig() {
 
    collectedData.theme = getString("general.theme", "bad");
    collectedData.maxFPS = getInt("general.maxFPS", 30, 1, 60);
 
    readGrid("grid");
 
    // players
    collectedData.playersWidth = getInt("players.width", 100, 50, 500);
    collectedData.startXPosition = getInt("players.startXPosition",600 ,0 ,1200);
    collectedData.playersSpeed = getInt("players.speed",1,1,100);
    collectedData.playersFireCooldown = getInt("players.fireCooldown",10,1,100);
    collectedData.playersLives = getInt("players.lives",3,1,100);
 
    // the scalability behind the vector of players is only an illusion, because we force player count to be 1 or 2
    // It was done so the 2+ players implementation could be easier in the future, if wanted
    collectedData.playerDefs.resize(2);
    readPlayer("players.user1", collectedData.playerDefs[0]);
    readPlayer("players.user2", collectedData.playerDefs[1]);
 
    // invaders
    collectedData.invadersSize = getInt("invaders.size",30,10,100);
    collectedData.invadersSpeed = getInt("invaders.speed",7,1,100);
    collectedData.invadersDistance = getInt("invaders.distance",15,5,100);
    collectedData.invadersFireCooldown = getInt("invaders.fireCooldown",0,0,100);
 
    readInvaderType("invaders.typeA", collectedData.invadersDef[InvaderType::TYPEA]);
    readInvaderType("invaders.typeB", collectedData.invadersDef[InvaderType::TYPEB]);
    readInvaderType("invaders.typeC", collectedData.invadersDef[InvaderType::TYPEC]);
 
    // projectiles
    collectedData.missilesWidth = getInt("projectiles.missiles.width",10,5,100);
    collectedData.missilesLength = collectedData.missilesWidth*PROJ_LENGTH_FACTOR;
    collectedData.missilesSpeed = getInt("projectiles.missiles.speed",10,5,100);
    getColor("projectiles.missiles.color", collectedData.missilesColor);
 
    collectedData.torpedosWidth = getInt("projectiles.torpedos.width",10,1,100);
    collectedData.torpedosLength = collectedData.torpedosWidth*PROJ_LENGTH_FACTOR;
    collectedData.torpedosSpeed = getInt("projectiles.torpedos.speed",10,1,100);
    getColor("projectiles.torpedos.color", collectedData.torpedosColor);
}
 
const string& ConfigBuilder::getString(const configKey& key, const string& def) const {
    try{
        return getString(key);
    }catch(config_error& e){
        cerr << e.what() << " . Using default value" << endl;
        return def;
    }
}
 
const string& ConfigBuilder::getString(const configKey& key) const {
    DEBUG_MSG("Querying config key " << key)
    if(internalValues.contains(key)){
        // We don't really care about querying the key two time since we are... well, in debug mode
        DEBUG_MSG("Got config value " << internalValues.at(key))
        return internalValues.at(key);
    }else{
        throw config_error("Non-existent key requested : "+key);
    }
}
 
int ConfigBuilder::getInt(const configKey& key, int def, int min, int max) const {
    try{
        int val = getInt(key);
        if(val < min || val > max){
            throw config_error("Value for key " + key + " do not follow preconditions : " +
                               to_string(min) + "<=" + to_string(val) + "<=" + to_string(max));
        }
        return val;
    }catch(config_error& e){
        cerr << e.what() << " . Using default value" << endl;
        return def;
    }
}
 
int ConfigBuilder::getInt(const configKey& key) const {
    try{
        return stoi(getString(key));
    }catch(invalid_argument& e){
        throw config_error("Invalid int data for key "+key+" : |"+getString(key)+"|");
    }
}
 
char ConfigBuilder::getChar(const configKey& key, char def) const {
    try{
        return getChar(key);
    }catch(config_error& e){
        cerr << e.what() << " . Using default value" << endl;
        return def;
    }
}
 
char ConfigBuilder::getChar(const configKey& key) const {
    string s = getString(key);
    if(s.size()!=1)throw config_error("Invalid char data for key "+key+" : |"+s+"|");
    return s[0];
}
 
void ConfigBuilder::getColor(const configKey& key, nsGraphics::RGBAcolor& color, const nsGraphics::RGBAcolor& def) const {
    try{
        getColor(key, color);
    }catch(config_error& e){
        cerr << e.what() << " . Using default value" << endl;
        color = def;
    }
}
 
void ConfigBuilder::getColor(const configKey& key, nsGraphics::RGBAcolor& color) const {
    // switch do not work with strings, and I don't want to implement a constexpr hash function
    string colorStr = getString(key);
    if (colorStr == "black")color = nsGraphics::KBlack;
    else if (colorStr == "white")color = nsGraphics::KWhite;
    else if (colorStr == "red")color = nsGraphics::KRed;
    else if (colorStr == "lime")color = nsGraphics::KLime;
    else if (colorStr == "blue")color = nsGraphics::KBlue;
    else if (colorStr == "yellow")color = nsGraphics::KYellow;
    else if (colorStr == "cyan")color = nsGraphics::KCyan;
    else if (colorStr == "magenta")color = nsGraphics::KMagenta;
    else if (colorStr == "silver")color = nsGraphics::KSilver;
    else if (colorStr == "gray")color = nsGraphics::KGray;
    else if (colorStr == "maroon")color = nsGraphics::KMaroon;
    else if (colorStr == "olive")color = nsGraphics::KOlive;
    else if (colorStr == "green")color = nsGraphics::KGreen;
    else if (colorStr == "purple")color = nsGraphics::KPurple;
    else if (colorStr == "teal")color = nsGraphics::KTeal;
    else if (colorStr == "navy")color = nsGraphics::KNavy;
    else throw config_error("Invalid color string : "+colorStr);
}
 
void ConfigBuilder::getList(const configKey& key, vector<string>& toPopulate) const {
    unsigned i=0;
    string fullKey = key+".0";
    if(!internalValues.contains(fullKey))throw config_error("Non-existent list key requested : "+key);
 
    do{
        toPopulate.push_back(internalValues.at(fullKey));
        ++i;
        fullKey = key+"."+to_string(i);
    }while(internalValues.contains(key+"."+to_string(i)));
}
 
 
bool Game::reloadConfig() {
    map<string, string> strValues;
    ConfigBuilder builder;
    bool parsed = false;
    try{
        builder.parseFile("config.yml");
        parsed = true;
        builder.readConfig();
    }catch(config_error& e){
        if(parsed)cerr << "An error occured while reading the configuration :" << endl;
        else cerr << "An error occured while parsing the configuration :" << endl;
        cerr << e.what() << endl;
        if(parsed){
            cerr << "Parsed keys :" << endl;
            builder.dumpInternalValues();
        }
        cerr << "(The old configuration was kept in memory)" << endl;
        return false;
    }
    confData = move(builder.collectedData);
    return true;
}