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 ANDROID_VINTF_REGEX_H_
18 #define ANDROID_VINTF_REGEX_H_
19 
20 #include <regex.h>
21 #include <string>
22 
23 namespace android {
24 namespace vintf {
25 namespace details {
26 
27 // A wrapper class around regex.h. This is used instead of C++ <regex> library because
28 // C++ regex library throws exceptions when an invalid regular expression is compiled.
29 // Use Extended Regular Expression (ERE) syntax.
30 class Regex {
31    public:
32     Regex() = default;
33     ~Regex();
34 
35     Regex& operator=(const Regex&) = delete;
36     Regex(const Regex&) = delete;
37 
38     __attribute__((warn_unused_result)) bool compile(const std::string& pattern);
39 
40     bool matches(const std::string& s) const;
41 
42     /**
43      * Return nullptr if not a valid regex pattern, else the Regex object.
44      */
45     static const Regex* Get(const std::string& pattern);
46 
47    private:
48     std::unique_ptr<regex_t> mImpl;
49 
50     void clear();
51 };
52 
53 }  // namespace details
54 }  // namespace vintf
55 }  // namespace android
56 
57 #endif  // ANDROID_VINTF_REGEX_H_
58