Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 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 | #pragma once |
| 18 | |
| 19 | #include <sstream> |
| 20 | #include <string> |
| 21 | #include <string_view> |
| 22 | #include <vector> |
| 23 | |
| 24 | namespace android { |
| 25 | namespace base { |
| 26 | |
| 27 | // Splits a string into a vector of strings. |
| 28 | // |
| 29 | // The string is split at each occurrence of a character in delimiters. |
| 30 | // |
| 31 | // The empty string is not a valid delimiter list. |
| 32 | std::vector<std::string> Split(const std::string& s, |
| 33 | const std::string& delimiters); |
| 34 | |
android-t1 | 3d2c5b2 | 2022-10-12 13:43:18 +0800 | [diff] [blame] | 35 | // Splits a string into a vector of string tokens. |
| 36 | // |
| 37 | // The string is split at each occurrence of a character in delimiters. |
| 38 | // Coalesce runs of delimiter bytes and ignore delimiter bytes at the start or |
| 39 | // end of string. In other words, return only nonempty string tokens. |
| 40 | // Use when you don't care about recovering the original string with Join(). |
| 41 | // |
| 42 | // Example: |
| 43 | // Tokenize(" foo bar ", " ") => {"foo", "bar"} |
| 44 | // Join(Tokenize(" foo bar", " "), " ") => "foo bar" |
| 45 | // |
| 46 | // The empty string is not a valid delimiter list. |
| 47 | std::vector<std::string> Tokenize(const std::string& s, const std::string& delimiters); |
| 48 | |
Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 49 | // Trims whitespace off both ends of the given string. |
| 50 | std::string Trim(const std::string& s); |
| 51 | |
| 52 | // Joins a container of things into a single string, using the given separator. |
| 53 | template <typename ContainerT, typename SeparatorT> |
| 54 | std::string Join(const ContainerT& things, SeparatorT separator) { |
| 55 | if (things.empty()) { |
| 56 | return ""; |
| 57 | } |
| 58 | |
| 59 | std::ostringstream result; |
| 60 | result << *things.begin(); |
| 61 | for (auto it = std::next(things.begin()); it != things.end(); ++it) { |
| 62 | result << separator << *it; |
| 63 | } |
| 64 | return result.str(); |
| 65 | } |
| 66 | |
| 67 | // We instantiate the common cases in strings.cpp. |
| 68 | extern template std::string Join(const std::vector<std::string>&, char); |
| 69 | extern template std::string Join(const std::vector<const char*>&, char); |
| 70 | extern template std::string Join(const std::vector<std::string>&, const std::string&); |
| 71 | extern template std::string Join(const std::vector<const char*>&, const std::string&); |
| 72 | |
| 73 | // Tests whether 's' starts with 'prefix'. |
| 74 | bool StartsWith(std::string_view s, std::string_view prefix); |
| 75 | bool StartsWith(std::string_view s, char prefix); |
| 76 | bool StartsWithIgnoreCase(std::string_view s, std::string_view prefix); |
| 77 | |
| 78 | // Tests whether 's' ends with 'suffix'. |
| 79 | bool EndsWith(std::string_view s, std::string_view suffix); |
| 80 | bool EndsWith(std::string_view s, char suffix); |
| 81 | bool EndsWithIgnoreCase(std::string_view s, std::string_view suffix); |
| 82 | |
| 83 | // Tests whether 'lhs' equals 'rhs', ignoring case. |
| 84 | bool EqualsIgnoreCase(std::string_view lhs, std::string_view rhs); |
| 85 | |
| 86 | // Removes `prefix` from the start of the given string and returns true (if |
| 87 | // it was present), false otherwise. |
| 88 | inline bool ConsumePrefix(std::string_view* s, std::string_view prefix) { |
| 89 | if (!StartsWith(*s, prefix)) return false; |
| 90 | s->remove_prefix(prefix.size()); |
| 91 | return true; |
| 92 | } |
| 93 | |
| 94 | // Removes `suffix` from the end of the given string and returns true (if |
| 95 | // it was present), false otherwise. |
| 96 | inline bool ConsumeSuffix(std::string_view* s, std::string_view suffix) { |
| 97 | if (!EndsWith(*s, suffix)) return false; |
| 98 | s->remove_suffix(suffix.size()); |
| 99 | return true; |
| 100 | } |
| 101 | |
| 102 | // Replaces `from` with `to` in `s`, once if `all == false`, or as many times as |
| 103 | // there are matches if `all == true`. |
| 104 | [[nodiscard]] std::string StringReplace(std::string_view s, std::string_view from, |
| 105 | std::string_view to, bool all); |
| 106 | |
android-t1 | 3d2c5b2 | 2022-10-12 13:43:18 +0800 | [diff] [blame] | 107 | // Converts an errno number to its error message string. |
| 108 | std::string ErrnoNumberAsString(int errnum); |
| 109 | |
Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [diff] [blame] | 110 | } // namespace base |
| 111 | } // namespace android |