exceptions.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2020, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#include "core-precomp.h"  // Precompiled headers

#include <mrpt/core/exceptions.h>

namespace mrpt::internal
{
std::string exception_line_msg(
    const std::string_view& msg, const char* filename, unsigned int line,
    const char* function_name)
{
    std::string s;
    s += filename;
    s += ":";
    s += std::to_string(line);
    s += ": [";
    s += function_name;
    s += "] ";
    s += msg;
    s += "\n";
    return s;
}

/** Recursive implementation for mrpt::exception_to_str() */
void impl_excep_to_str(const std::exception& e, std::string& ret, int lvl = 0)
{
    using namespace std::string_literals;
    std::string err{e.what()};
    if (!err.empty() && *err.rbegin() != '\n') err += "\n"s;
    ret = "["s + std::to_string(lvl) + "] "s + err + ret;
    try
    {
        std::rethrow_if_nested(e);
        // We traversed the entire call stack,
        // show just the original error message: "file:line: [func] MSG"
        if (const auto idx = err.find("]"); idx != std::string::npos)
            err = "Exception message: "s + err.substr(idx + 1);
        ret = err + std::string("==== MRPT exception backtrace ====\n") + ret;
    }
    catch (const std::exception& er)
    {
        // It's nested: recursive call
        impl_excep_to_str(er, ret, lvl + 1);
    }
    catch (...)
    {
    }
}
}  // namespace mrpt::internal

std::string mrpt::exception_to_str(const std::exception& e)
{
    std::string descr;
    mrpt::internal::impl_excep_to_str(e, descr);
    return descr;
}