1 //
2 // Copyright 2019 The Abseil Authors.
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 //      https://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 #ifndef ABSL_FLAGS_INTERNAL_PARSE_H_
17 #define ABSL_FLAGS_INTERNAL_PARSE_H_
18 
19 #include <string>
20 #include <vector>
21 
22 #include "absl/base/config.h"
23 #include "absl/flags/declare.h"
24 #include "absl/strings/string_view.h"
25 
26 ABSL_DECLARE_FLAG(std::vector<std::string>, flagfile);
27 ABSL_DECLARE_FLAG(std::vector<std::string>, fromenv);
28 ABSL_DECLARE_FLAG(std::vector<std::string>, tryfromenv);
29 ABSL_DECLARE_FLAG(std::vector<std::string>, undefok);
30 
31 namespace absl {
32 ABSL_NAMESPACE_BEGIN
33 namespace flags_internal {
34 
35 enum class ArgvListAction { kRemoveParsedArgs, kKeepParsedArgs };
36 enum class UsageFlagsAction { kHandleUsage, kIgnoreUsage };
37 enum class OnUndefinedFlag {
38   kIgnoreUndefined,
39   kReportUndefined,
40   kAbortIfUndefined
41 };
42 
43 std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
44                                         ArgvListAction arg_list_act,
45                                         UsageFlagsAction usage_flag_act,
46                                         OnUndefinedFlag on_undef_flag);
47 
48 // --------------------------------------------------------------------
49 // Inspect original command line
50 
51 // Returns true if flag with specified name was either present on the original
52 // command line or specified in flag file present on the original command line.
53 bool WasPresentOnCommandLine(absl::string_view flag_name);
54 
55 }  // namespace flags_internal
56 ABSL_NAMESPACE_END
57 }  // namespace absl
58 
59 #endif  // ABSL_FLAGS_INTERNAL_PARSE_H_
60