1 /* 2 * Copyright (C) 2019 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 <string_view> 20 #include <vector> 21 22 namespace android::incfs { 23 24 // Splits a string and calls |onSplitCb| for each occurrence of a substring 25 // between delimiters (including empty ones for two delimiters in a row) 26 // 27 // |delimiters| can either be a list of delimiters in something string-like 28 // or a single character (which is more efficient). 29 // 30 // An empty string is not a valid delimiter. 31 // 32 template <class Callback, class Separator> 33 void Split(std::string_view s, Separator delimiters, Callback&& onSplitCb) { 34 size_t base = 0; 35 for (;;) { 36 const auto found = s.find_first_of(delimiters, base); 37 onSplitCb(s.substr(base, found - base)); 38 if (found == std::string_view::npos) { 39 break; 40 } 41 base = found + 1; 42 } 43 } 44 45 // Splits a string into a vector of string views. 46 // 47 // The string is split at each occurrence of a character in |delimiters|. 48 // 49 // The empty string is not a valid delimiter list. 50 // 51 template <class Separator> 52 void Split(std::string_view s, Separator delimiters, std::vector<std::string_view>* out) { 53 out->clear(); 54 Split(s, delimiters, [out](std::string_view split) { out->emplace_back(split); }); 55 } 56 57 template <class Separator> 58 std::vector<std::string_view> Split(std::string_view s, Separator delimiters) { 59 std::vector<std::string_view> result; 60 Split(s, delimiters, &result); 61 return result; 62 } 63 64 } // namespace android::incfs 65