PokemonScriptTester/src/Tester/RequirementFailed.hpp

#ifndef POKEMONSCRIPTTESTER_REQUIREMENTFAILED_HPP
#define POKEMONSCRIPTTESTER_REQUIREMENTFAILED_HPP
#include <exception>
#include <sstream>

class RequirementFailed : public std::exception {
    static inline std::string& ltrim(std::string& s, const char* t = " \t\n\r\f\v") {
        s.erase(0, s.find_first_not_of(t));
        return s;
    }
    static std::string GetLine(const std::string& path, size_t num) {
        std::ifstream file;
        file.open(path);

        file.seekg(std::ios::beg);
        for (size_t i = 0; i < num - 1; ++i) {
            file.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
        }
        std::string line;
        std::getline(file, line);
        file.close();
        line = ltrim(line);
        return line;
    }

    char* _msg;

public:
    RequirementFailed(const std::string& path, size_t line, const std::string& message = "") {
        auto l = GetLine(path, line);
        std::stringstream ss;
        ss << "Requirement failed at: " << path << ":" << line << std::endl;
        ss << l;
        if (message.length() > 0) {
            ss << std::endl << message;
        }
        auto str = ss.str();
        _msg = new char[str.length() + 1];
        str.copy(_msg, str.length(), 0);
        _msg[str.length()] = 0;
    }

    ~RequirementFailed() { delete[] _msg; }

    const char* what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_NOTHROW override { return _msg; }
};

#endif // POKEMONSCRIPTTESTER_REQUIREMENTFAILED_HPP