100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
/*
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* Copyright 2016 WebAssembly Community Group participants
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef WABT_OPTION_PARSER_H_
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#define WABT_OPTION_PARSER_H_
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#include <functional>
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#include <string>
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#include <vector>
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#include "wabt/common.h"
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namespace wabt {
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class OptionParser {
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public:
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enum class HasArgument { No, Yes };
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enum class ArgumentCount { One, OneOrMore, ZeroOrMore };
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struct Option;
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using Callback = std::function<void(const char*)>;
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using NullCallback = std::function<void()>;
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struct Option {
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Option(char short_name,
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const std::string& long_name,
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const std::string& metavar,
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HasArgument has_argument,
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const std::string& help,
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const Callback&);
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char short_name;
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std::string long_name;
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std::string metavar;
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bool has_argument;
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std::string help;
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Callback callback;
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};
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struct Argument {
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Argument(const std::string& name, ArgumentCount, const Callback&);
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std::string name;
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ArgumentCount count;
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Callback callback;
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int handled_count = 0;
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};
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explicit OptionParser(const char* program_name, const char* description);
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void AddOption(const Option&);
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void AddArgument(const std::string& name, ArgumentCount, const Callback&);
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void SetErrorCallback(const Callback&);
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void Parse(int argc, char* argv[]);
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void PrintHelp();
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// Helper functions.
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void AddOption(char short_name,
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const char* long_name,
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const char* help,
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const NullCallback&);
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void AddOption(const char* long_name, const char* help, const NullCallback&);
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void AddOption(char short_name,
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const char* long_name,
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const char* metavar,
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const char* help,
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const Callback&);
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private:
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static int Match(const char* s, const std::string& full, bool has_argument);
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void WABT_PRINTF_FORMAT(2, 3) Errorf(const char* format, ...);
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void HandleArgument(size_t* arg_index, const char* arg_value);
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// Print the error and exit(1).
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void DefaultError(const std::string&);
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std::string program_name_;
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std::string description_;
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std::vector<Option> options_;
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std::vector<Argument> arguments_;
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Callback on_error_;
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};
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} // namespace wabt
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#endif /* WABT_OPTION_PARSER_H_ */
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