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/**
*
* @file BadVariantAccessRule.cpp
* @author Gaspard Kirira
*
* Copyright 2025, Gaspard Kirira. All rights reserved.
* https://github.com/vixcpp/vix
* Use of this source code is governed by a MIT license
* that can be found in the License file.
*
* Vix.cpp
*
*/
#include <vix/cli/errors/runtime/IRuntimeErrorRule.hpp>
#include <vix/cli/errors/runtime/RuntimeRuleUtils.hpp>
#include <filesystem>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <vix/cli/Style.hpp>
using namespace vix::cli::style;
namespace vix::cli::errors::runtime
{
namespace
{
bool looks_like_bad_variant_access_log(
const std::string &log)
{
return icontains(log, "std::bad_variant_access") ||
icontains(log, "bad_variant_access") ||
icontains(log, "bad variant access") ||
icontains(log, "std::get: wrong index for variant") ||
icontains(log, "wrong index for variant");
}
std::vector<std::string>
source_patterns_for_bad_variant_access()
{
/*
* std::bad_variant_access is normally produced by std::get.
*
* Do not search for .value(): that operation belongs mainly
* to std::optional and could highlight an unrelated line.
*/
return {
"std::get<",
"std::get(",
};
}
std::string choose_message()
{
return "variant holds a different value";
}
std::string choose_description()
{
return "The requested type is not currently active in this std::variant.";
}
std::string choose_hint()
{
return "check the active alternative with std::holds_alternative<T>() or use std::get_if<T>()";
}
void print_error(
const std::string &message,
const std::string &description)
{
std::cerr << RED
<< "runtime error: "
<< message
<< RESET
<< "\n";
if (!description.empty())
{
std::cerr << " "
<< description
<< "\n";
}
}
void print_hint_and_location(
const std::string &hint,
const RuntimeLocation &location)
{
std::vector<std::string> hints;
if (!hint.empty())
hints.push_back(hint);
/*
* Print "at:" only when Vix found a real or useful
* source location.
*
* Do not fall back to "source: main.cpp", because the
* source file alone is not an error location.
*/
const std::string at =
location.valid()
? make_at_text(
location,
std::filesystem::path{})
: std::string{};
if (hints.empty() && at.empty())
return;
std::cerr << "\n";
print_runtime_hints_and_at(
hints,
at);
}
} // namespace
class BadVariantAccessRule final
: public IRuntimeErrorRule
{
public:
bool match(
const std::string &log,
const std::filesystem::path &sourceFile) const override
{
(void)sourceFile;
return looks_like_bad_variant_access_log(log);
}
bool handle(
const std::string &log,
const std::filesystem::path &sourceFile) const override
{
const std::string message =
choose_message();
const std::string description =
choose_description();
RuntimeLocation location =
find_best_runtime_location(
log,
sourceFile);
if (!location.valid())
{
/*
* Preserve the existing runtime-location contract.
*
* When the runtime provides no location, search only
* for operations that can actually throw
* std::bad_variant_access.
*/
location =
find_best_runtime_location_or_source_hint(
log,
sourceFile,
source_patterns_for_bad_variant_access());
}
print_error(
message,
description);
if (location.valid())
{
const auto error =
make_runtime_location(
location.file,
location.line,
location.column,
message);
print_runtime_codeframe(error);
}
print_hint_and_location(
choose_hint(),
location);
return true;
}
};
std::unique_ptr<IRuntimeErrorRule>
makeBadVariantAccessRule()
{
return std::make_unique<
BadVariantAccessRule>();
}
} // namespace vix::cli::errors::runtime