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/*
* Copyright 2016 WebAssembly Community Group participants
*
* 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
*
* http://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.
*/
#ifndef WABT_OPTION_PARSER_H_
#define WABT_OPTION_PARSER_H_
#include <functional>
#include <string>
#include <vector>
#include "wabt/common.h"
namespace wabt {
class OptionParser {
public:
enum class HasArgument { No, Yes };
enum class ArgumentCount { One, OneOrMore, ZeroOrMore };
struct Option;
using Callback = std::function<void(const char*)>;
using NullCallback = std::function<void()>;
struct Option {
Option(char short_name,
const std::string& long_name,
const std::string& metavar,
HasArgument has_argument,
const std::string& help,
const Callback&);
char short_name;
std::string long_name;
std::string metavar;
bool has_argument;
std::string help;
Callback callback;
};
struct Argument {
Argument(const std::string& name, ArgumentCount, const Callback&);
std::string name;
ArgumentCount count;
Callback callback;
int handled_count = 0;
};
explicit OptionParser(const char* program_name, const char* description);
void AddOption(const Option&);
void AddArgument(const std::string& name, ArgumentCount, const Callback&);
void SetErrorCallback(const Callback&);
void Parse(int argc, char* argv[]);
void PrintHelp();
// Helper functions.
void AddOption(char short_name,
const char* long_name,
const char* help,
const NullCallback&);
void AddOption(const char* long_name, const char* help, const NullCallback&);
void AddOption(char short_name,
const char* long_name,
const char* metavar,
const char* help,
const Callback&);
private:
static int Match(const char* s, const std::string& full, bool has_argument);
void WABT_PRINTF_FORMAT(2, 3) Errorf(const char* format, ...);
void HandleArgument(size_t* arg_index, const char* arg_value);
// Print the error and exit(1).
void DefaultError(const std::string&);
std::string program_name_;
std::string description_;
std::vector<Option> options_;
std::vector<Argument> arguments_;
Callback on_error_;
};
} // namespace wabt
#endif /* WABT_OPTION_PARSER_H_ */
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