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

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

#include "BlockRegistry.h"

static Block NULL_BLOCK(0, "null_block");
static std::unordered_map<std::string, u16> registry;
static std::vector<Block> idMap = {NULL_BLOCK};

void BlockRegistry::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& BlockRegistry::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& BlockRegistry::getBlock(u16 id)
{
    if(id >= idMap.size())
    {
        return NULL_BLOCK;
    }
    return idMap[id];
}