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131 lines (110 loc) · 3.18 KB
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/**
*
* @file TupleVariantAccessRule.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/template/ITemplateErrorRule.hpp>
#include <vix/cli/errors/CodeFrame.hpp>
#include <iostream>
#include <memory>
#include <string>
#include <vix/cli/Style.hpp>
using namespace vix::cli::style;
namespace vix::cli::errors::template_rules
{
namespace
{
bool icontains(const std::string &text, const std::string &needle)
{
if (needle.empty())
return true;
auto lower = [](unsigned char c) -> char
{
if (c >= 'A' && c <= 'Z')
return static_cast<char>(c + ('a' - 'A'));
return static_cast<char>(c);
};
if (text.size() < needle.size())
return false;
for (std::size_t i = 0; i + needle.size() <= text.size(); ++i)
{
bool ok = true;
for (std::size_t j = 0; j < needle.size(); ++j)
{
if (lower(static_cast<unsigned char>(text[i + j])) !=
lower(static_cast<unsigned char>(needle[j])))
{
ok = false;
break;
}
}
if (ok)
return true;
}
return false;
}
std::string choose_hint(const std::string &message)
{
(void)message;
return "check the index or type used with std::get";
}
} // namespace
class TupleVariantAccessRule final : public ITemplateErrorRule
{
public:
bool match(const vix::cli::errors::CompilerError &err) const override
{
const std::string &message = err.message;
if (icontains(message, "tuple index must be in range"))
return true;
if (icontains(message, "tuple_element"))
return true;
if (icontains(message, "variant index"))
return true;
if (icontains(message, "bad_variant_access"))
return true;
// "std::get" alone is too generic; require an additional access-style signal.
if (icontains(message, "std::get") &&
(icontains(message, "no matching") ||
icontains(message, "not unique") ||
icontains(message, "not exactly once") ||
icontains(message, "ambiguous")))
{
return true;
}
return false;
}
bool handle(
const vix::cli::errors::CompilerError &err,
const vix::cli::errors::ErrorContext &ctx) const override
{
std::cerr << RED
<< "error: invalid tuple/variant access"
<< RESET << "\n";
printCodeFrame(err, ctx);
std::cerr << YELLOW
<< "hint: "
<< RESET
<< choose_hint(err.message)
<< "\n";
std::cerr << GREEN
<< "at: "
<< RESET
<< err.file << ":" << err.line << ":" << err.column
<< "\n";
return true;
}
};
std::unique_ptr<ITemplateErrorRule> makeTupleVariantAccessRule()
{
return std::make_unique<TupleVariantAccessRule>();
}
} // namespace vix::cli::errors::template_rules