enum.h

// Copyright 2024 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// 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.
#pragma once
 
#include "pw_preprocessor/apply.h"
#include "pw_tokenizer/internal/enum.h"
#include "pw_tokenizer/tokenize.h"
 
namespace pw::tokenizer {
 
template <typename T>
constexpr auto EnumToToken(T value) {
  static_assert(std::is_enum_v<T>, "Must be an enum");
  static_assert(sizeof(T) <= sizeof(Token), "Must fit in a token");
  return static_cast<Token>(value);
}
 
template <typename T>
constexpr const char* EnumToString(T value) {
  return PwTokenizerEnumToString(value);
}
 
}  // namespace pw::tokenizer
 
#define PW_TOKENIZE_ENUM(fully_qualified_name, ...)               \
  PW_APPLY(_PW_TOKENIZE_ENUMERATOR,                               \
           _PW_SEMICOLON,                                         \
           fully_qualified_name,                                  \
           __VA_ARGS__);                                          \
  [[maybe_unused]] constexpr const char* PwTokenizerEnumToString( \
      fully_qualified_name _pw_enum_value) {                      \
    switch (_pw_enum_value) {                                     \
      PW_APPLY(_PW_TOKENIZE_TO_STRING_CASE,                       \
               _PW_SEMICOLON,                                     \
               fully_qualified_name,                              \
               __VA_ARGS__);                                      \
    }                                                             \
    return "Unknown " #fully_qualified_name " value";             \
  }                                                               \
  static_assert(true)
 
#define PW_TOKENIZE_ENUM_CUSTOM(fully_qualified_name, ...)        \
  PW_APPLY(_PW_TOKENIZE_ENUMERATOR_CUSTOM,                        \
           _PW_SEMICOLON,                                         \
           fully_qualified_name,                                  \
           __VA_ARGS__);                                          \
  [[maybe_unused]] constexpr const char* PwTokenizerEnumToString( \
      fully_qualified_name _pw_enum_value) {                      \
    switch (_pw_enum_value) {                                     \
      PW_APPLY(_PW_TOKENIZE_TO_STRING_CASE_CUSTOM,                \
               _PW_SEMICOLON,                                     \
               fully_qualified_name,                              \
               __VA_ARGS__);                                      \
    }                                                             \
    return "Unknown " #fully_qualified_name " value";             \
  }                                                               \
  static_assert(true)