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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// -*- mode: C++ -*-
//
// Copyright 2021-2022 Google LLC
//
// Licensed under the Apache License v2.0 with LLVM Exceptions (the
// "License"); you may not use this file except in compliance with the
// License. You may obtain a copy of the License at
//
// https://llvm.org/LICENSE.txt
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Author: Giuliano Procida
#ifndef STG_ERROR_H_
#define STG_ERROR_H_
#include <exception>
#include <ios>
#include <iostream>
#include <optional>
#include <ostream>
#include <sstream>
#include <string>
namespace stg {
class Exception : public std::exception {
public:
explicit Exception(const std::string& message) : message_(message) {}
const char* what() const noexcept(true) final {
return message_.c_str();
}
private:
const std::string message_;
};
class Check {
public:
explicit Check(bool ok)
: os_(ok ? std::optional<std::ostringstream>()
: std::make_optional<std::ostringstream>()) {}
~Check() noexcept(false) {
if (os_) {
throw Exception(os_->str());
}
}
template <typename T>
Check& operator<<(const T& t) {
if (os_) {
*os_ << t;
}
return *this;
}
private:
std::optional<std::ostringstream> os_;
};
class Die {
public:
[[noreturn]] ~Die() noexcept(false) {
throw Exception(os_.str());
}
template <typename T>
Die& operator<<(const T& t) {
os_ << t;
return *this;
}
private:
std::ostringstream os_;
};
class Warn {
public:
~Warn() {
std::cerr << "warning: " << os_.str() << '\n';
}
template <typename T>
Warn& operator<<(const T& t) {
os_ << t;
return *this;
}
private:
std::ostringstream os_;
};
struct Error {
explicit Error(int number) : number(number) {}
int number;
};
inline std::ostream& operator<<(std::ostream& os, Error error) {
return os << std::system_error(error.number, std::generic_category()).what();
}
template <typename T>
struct Hex {
explicit Hex(const T& value) : value(value) {}
const T& value;
};
template <typename T> Hex(const T&) -> Hex<T>;
template <typename T>
std::ostream& operator<<(std::ostream& os, const Hex<T>& hex_value) {
// not quite right if an exception is thrown
const auto flags = os.flags();
os << std::hex << std::showbase << hex_value.value;
os.flags(flags);
return os;
}
} // namespace stg
#endif // STG_ERROR_H_
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