1 /*
2  * Copyright (C) 2015 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 AAPT_FLAGS_H
18 #define AAPT_FLAGS_H
19 
20 #include "util/Maybe.h"
21 #include "util/StringPiece.h"
22 
23 #include <functional>
24 #include <ostream>
25 #include <string>
26 #include <vector>
27 
28 namespace aapt {
29 
30 class Flags {
31 public:
32     Flags& requiredFlag(const StringPiece& name, const StringPiece& description,
33                         std::string* value);
34     Flags& requiredFlagList(const StringPiece& name, const StringPiece& description,
35                             std::vector<std::string>* value);
36     Flags& optionalFlag(const StringPiece& name, const StringPiece& description,
37                         Maybe<std::string>* value);
38     Flags& optionalFlagList(const StringPiece& name, const StringPiece& description,
39                             std::vector<std::string>* value);
40     Flags& optionalSwitch(const StringPiece& name, const StringPiece& description,
41                           bool* value);
42 
43     void usage(const StringPiece& command, std::ostream* out);
44 
45     bool parse(const StringPiece& command, const std::vector<StringPiece>& args,
46                std::ostream* outError);
47 
48     const std::vector<std::string>& getArgs();
49 
50 private:
51     struct Flag {
52         std::string name;
53         std::string description;
54         std::function<bool(const StringPiece& value)> action;
55         bool required;
56         size_t numArgs;
57 
58         bool parsed;
59     };
60 
61     std::vector<Flag> mFlags;
62     std::vector<std::string> mArgs;
63 };
64 
65 } // namespace aapt
66 
67 #endif // AAPT_FLAGS_H
68