Catalog.hpp

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#pragma once
 
#include <cstddef>
#include <filesystem>
#include <optional>
#include <string>
#include <string_view>
#include <vector>
 
namespace tinysql {
 
inline constexpr std::string_view kCatalogTable = "SYSTEM_TABLE";
 
struct Column {
    std::string name;      
    std::string type;      
    std::size_t from = 0;  
    std::size_t to = 0;    
 
    std::size_t width() const { return to - from + 1; }
};
 
struct TableSchema {
    std::string name;              
    std::vector<Column> columns;   
    std::size_t recordLength = 0;  
 
    std::optional<std::size_t> indexOf(std::string_view columnName) const;
 
    bool hasAutoId() const;
};
 
class Catalog {
public:
    static Catalog load(const std::filesystem::path& dataDir);
 
    const TableSchema& table(std::string_view name) const;
 
    const std::vector<TableSchema>& tables() const { return tables_; }
 
    std::filesystem::path dataFile(const TableSchema& table) const;
 
private:
    std::filesystem::path dataDir_;    
    std::vector<TableSchema> tables_;  
};
 
}  // namespace tinysql