| // Copyright 2014 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef LIBCHROMEOS_CHROMEOS_STRINGS_STRING_UTILS_H_ |
| #define LIBCHROMEOS_CHROMEOS_STRINGS_STRING_UTILS_H_ |
| |
| #include <string> |
| #include <utility> |
| #include <vector> |
| |
| #include <chromeos/chromeos_export.h> |
| |
| namespace chromeos { |
| namespace string_utils { |
| |
| // Treats the string as a delimited list of substrings and returns the array |
| // of original elements of the list. |
| // |trim_whitespaces| causes each element to have all whitespaces trimmed off. |
| // |purge_empty_strings| specifies whether empty elements from the original |
| // string should be omitted. |
| CHROMEOS_EXPORT std::vector<std::string> Split(const std::string& str, |
| const std::string& delimiter, |
| bool trim_whitespaces, |
| bool purge_empty_strings); |
| // Splits the string, trims all whitespaces, omits empty string parts. |
| inline std::vector<std::string> Split(const std::string& str, |
| const std::string& delimiter) { |
| return Split(str, delimiter, true, true); |
| } |
| // Splits the string, omits empty string parts. |
| inline std::vector<std::string> Split(const std::string& str, |
| const std::string& delimiter, |
| bool trim_whitespaces) { |
| return Split(str, delimiter, trim_whitespaces, true); |
| } |
| |
| // Splits the string into two pieces at the first position of the specified |
| // delimiter. |
| CHROMEOS_EXPORT std::pair<std::string, std::string> SplitAtFirst( |
| const std::string& str, |
| const std::string& delimiter, |
| bool trim_whitespaces); |
| // Splits the string into two pieces at the first position of the specified |
| // delimiter. Both parts have all whitespaces trimmed off. |
| inline std::pair<std::string, std::string> SplitAtFirst( |
| const std::string& str, |
| const std::string& delimiter) { |
| return SplitAtFirst(str, delimiter, true); |
| } |
| |
| // The following overload returns false if the delimiter was not found in the |
| // source string. In this case, |left_part| will be set to |str| and |
| // |right_part| will be empty. |
| CHROMEOS_EXPORT bool SplitAtFirst(const std::string& str, |
| const std::string& delimiter, |
| std::string* left_part, |
| std::string* right_part, |
| bool trim_whitespaces); |
| // Always trims the white spaces in the split parts. |
| inline bool SplitAtFirst(const std::string& str, |
| const std::string& delimiter, |
| std::string* left_part, |
| std::string* right_part) { |
| return SplitAtFirst(str, delimiter, left_part, right_part, true); |
| } |
| |
| // Joins strings into a single string separated by |delimiter|. |
| template <class InputIterator> |
| std::string JoinRange(const std::string& delimiter, |
| InputIterator first, |
| InputIterator last) { |
| std::string result; |
| if (first == last) |
| return result; |
| result = *first; |
| for (++first; first != last; ++first) { |
| result += delimiter; |
| result += *first; |
| } |
| return result; |
| } |
| |
| template <class Container> |
| std::string Join(const std::string& delimiter, const Container& strings) { |
| using std::begin; |
| using std::end; |
| return JoinRange(delimiter, begin(strings), end(strings)); |
| } |
| |
| inline std::string Join(const std::string& delimiter, |
| std::initializer_list<std::string> strings) { |
| return JoinRange(delimiter, strings.begin(), strings.end()); |
| } |
| |
| inline std::string Join(const std::string& delimiter, |
| const std::string& str1, |
| const std::string& str2) { |
| return str1 + delimiter + str2; |
| } |
| |
| // string_utils::ToString() is a helper function to convert any scalar type |
| // to a string. In most cases, it redirects the call to std::to_string with |
| // two exceptions: for std::string itself and for double and bool. |
| template<typename T> |
| inline std::string ToString(T value) { |
| return std::to_string(value); |
| } |
| // Having the following overload is handy for templates where the type |
| // of template parameter isn't known and could be a string itself. |
| inline std::string ToString(std::string value) { |
| return value; |
| } |
| // We overload this for double because std::to_string(double) uses %f to |
| // format the value and I would like to use a shorter %g format instead. |
| CHROMEOS_EXPORT std::string ToString(double value); |
| // And the bool to be converted as true/false instead of 1/0. |
| CHROMEOS_EXPORT std::string ToString(bool value); |
| |
| // Converts a byte-array into a string. This method doesn't perform any |
| // data re-encoding. It just takes every byte from the buffer and appends it |
| // to the string as a character. |
| CHROMEOS_EXPORT std::string GetBytesAsString(const std::vector<uint8_t>& buf); |
| |
| // Converts a string into a byte-array. Opposite of GetBytesAsString(). |
| CHROMEOS_EXPORT std::vector<uint8_t> GetStringAsBytes(const std::string& str); |
| |
| } // namespace string_utils |
| } // namespace chromeos |
| |
| #endif // LIBCHROMEOS_CHROMEOS_STRINGS_STRING_UTILS_H_ |