1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef IDMAP2_INCLUDE_IDMAP2_COMMANDLINEOPTIONS_H_
18 #define IDMAP2_INCLUDE_IDMAP2_COMMANDLINEOPTIONS_H_
19 
20 #include <functional>
21 #include <memory>
22 #include <ostream>
23 #include <string>
24 #include <vector>
25 
26 #include "idmap2/Result.h"
27 
28 namespace android::idmap2 {
29 
30 /*
31  * Utility class to convert a command line, including options (--path foo.txt),
32  * into data structures (options.path = "foo.txt").
33  */
34 class CommandLineOptions {
35  public:
36   static std::unique_ptr<std::vector<std::string>> ConvertArgvToVector(int argc, const char** argv);
37 
CommandLineOptions(const std::string & name)38   explicit CommandLineOptions(const std::string& name) : name_(name) {
39   }
40 
41   CommandLineOptions& OptionalFlag(const std::string& name, const std::string& description,
42                                    bool* value);
43   CommandLineOptions& MandatoryOption(const std::string& name, const std::string& description,
44                                       std::string* value);
45   CommandLineOptions& MandatoryOption(const std::string& name, const std::string& description,
46                                       std::vector<std::string>* value);
47   CommandLineOptions& OptionalOption(const std::string& name, const std::string& description,
48                                      std::string* value);
49   CommandLineOptions& OptionalOption(const std::string& name, const std::string& description,
50                                      std::vector<std::string>* value);
51   Result<Unit> Parse(const std::vector<std::string>& argv) const;
52   void Usage(std::ostream& out) const;
53 
54  private:
55   struct Option {
56     std::string name;
57     std::string description;
58     std::function<void(const std::string& value)> action;
59     enum {
60       COUNT_OPTIONAL,
61       COUNT_EXACTLY_ONCE,
62       COUNT_ONCE_OR_MORE,
63       COUNT_OPTIONAL_ONCE_OR_MORE,
64     } count;
65     bool argument;
66   };
67 
68   mutable std::vector<Option> options_;
69   std::string name_;
70 };
71 
72 }  // namespace android::idmap2
73 
74 #endif  // IDMAP2_INCLUDE_IDMAP2_COMMANDLINEOPTIONS_H_
75