cube-game-plus-plus/common/block/BlockRegistry.cpp

#include <unordered_map>
#include <vector>
#include <fstream>
#include <iostream>

#include "BlockRegistry.h"

namespace BlockRegistry
{
    static Block NULL_BLOCK(0, "null_block");
    static std::unordered_map<std::string, u16> registry;
    static std::vector<Block> idMap = {NULL_BLOCK};
    
    void loadFromFile(const std::string& path)
    {
        std::ifstream in;
        in.open(path);
        if(in.fail())
        {
            std::cout << "cannot read blocks from file '" << path << "'" << std::endl;
            return;
        }
        std::string line;
        while(true)
        {
            std::getline(in, line, '\n');
            if(in.fail())
            {
                break;
            }
            u16 id = idMap.size();
            idMap.emplace_back(id, line);
            registry[line] = id;
        }
    }

    const Block& getBlock(const std::string& name)
    {
        const std::unordered_map<std::string, u16>::const_iterator& iter = registry.find(name);
        if(iter == registry.end())
        {
            return NULL_BLOCK;
        }    
        return idMap[iter->second];
    }

    const Block& getBlock(u16 id)
    {
        if(id >= idMap.size())
        {
            return NULL_BLOCK;
        }
        return idMap[id];
    }
}