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      1 /*
      2  * Copyright (C) 2016 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 STRING_HELPER_H_
     18 
     19 #define STRING_HELPER_H_
     20 
     21 #include <string>
     22 #include <vector>
     23 
     24 namespace android {
     25 
     26 struct StringHelper {
     27 
     28     enum Case {
     29         // return original string
     30         kNoCase = 0,
     31         // use camelCase
     32         kCamelCase = 1,
     33         // use PascalCase
     34         kPascalCase = 2,
     35         // use UP_SNAKE_CASE
     36         kUpperSnakeCase = 3,
     37         // use low_snake_case
     38         kLowerSnakeCase = 4
     39     };
     40 
     41     // methods for a single word, like device
     42     // UPPERCASE
     43     static std::string Uppercase(const std::string &in);
     44     // lowercase
     45     static std::string Lowercase(const std::string &in);
     46     // Capitalize
     47     static std::string Capitalize(const std::string &in);
     48 
     49     // methods for a multi-word identifier, like framebuffer_device
     50     static std::string ToCamelCase(const std::string &in);
     51     static std::string ToPascalCase(const std::string &in);
     52     static std::string ToUpperSnakeCase(const std::string &in);
     53     static std::string ToLowerSnakeCase(const std::string &in);
     54     static std::string ToCase(Case c, const std::string &in);
     55 
     56     static bool EndsWith(const std::string &in, const std::string &suffix);
     57     static bool StartsWith(const std::string &in, const std::string &prefix);
     58 
     59     /* removes suffix once from in if in ends with suffix */
     60     static std::string RTrim(const std::string &in, const std::string &suffix);
     61 
     62     /* removes prefix once from in if in starts with prefix */
     63     static std::string LTrim(const std::string &in, const std::string &prefix);
     64 
     65     /* removes suffix repeatedly from in if in ends with suffix */
     66     static std::string RTrimAll(const std::string &in, const std::string &suffix);
     67 
     68     /* removes prefix repeatedly from in if in starts with prefix */
     69     static std::string LTrimAll(const std::string &in, const std::string &prefix);
     70 
     71 
     72     static void SplitString(
     73         const std::string &s,
     74         char c,
     75         std::vector<std::string> *components);
     76 
     77     static std::string JoinStrings(
     78         const std::vector<std::string> &components,
     79         const std::string &separator);
     80 
     81 private:
     82     StringHelper() = delete;
     83 
     84     static void Tokenize(const std::string &in,
     85         std::vector<std::string> *vec);
     86 };
     87 
     88 }  // namespace android
     89 
     90 #endif  // STRING_HELPER_H_
     91 
     92