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95 lines
3.3 KiB
95 lines
3.3 KiB
4 months ago
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/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <sstream>
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#include <string>
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#include <string_view>
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#include <vector>
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namespace android {
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namespace base {
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// Splits a string into a vector of strings.
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//
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// The string is split at each occurrence of a character in delimiters.
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//
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// The empty string is not a valid delimiter list.
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std::vector<std::string> Split(const std::string& s,
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const std::string& delimiters);
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// Trims whitespace off both ends of the given string.
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std::string Trim(const std::string& s);
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// Joins a container of things into a single string, using the given separator.
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template <typename ContainerT, typename SeparatorT>
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std::string Join(const ContainerT& things, SeparatorT separator) {
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if (things.empty()) {
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return "";
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}
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std::ostringstream result;
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result << *things.begin();
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for (auto it = std::next(things.begin()); it != things.end(); ++it) {
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result << separator << *it;
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}
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return result.str();
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}
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// We instantiate the common cases in strings.cpp.
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extern template std::string Join(const std::vector<std::string>&, char);
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extern template std::string Join(const std::vector<const char*>&, char);
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extern template std::string Join(const std::vector<std::string>&, const std::string&);
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extern template std::string Join(const std::vector<const char*>&, const std::string&);
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// Tests whether 's' starts with 'prefix'.
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bool StartsWith(std::string_view s, std::string_view prefix);
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bool StartsWith(std::string_view s, char prefix);
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bool StartsWithIgnoreCase(std::string_view s, std::string_view prefix);
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// Tests whether 's' ends with 'suffix'.
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bool EndsWith(std::string_view s, std::string_view suffix);
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bool EndsWith(std::string_view s, char suffix);
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bool EndsWithIgnoreCase(std::string_view s, std::string_view suffix);
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// Tests whether 'lhs' equals 'rhs', ignoring case.
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bool EqualsIgnoreCase(std::string_view lhs, std::string_view rhs);
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// Removes `prefix` from the start of the given string and returns true (if
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// it was present), false otherwise.
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inline bool ConsumePrefix(std::string_view* s, std::string_view prefix) {
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if (!StartsWith(*s, prefix)) return false;
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s->remove_prefix(prefix.size());
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return true;
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}
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// Removes `suffix` from the end of the given string and returns true (if
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// it was present), false otherwise.
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inline bool ConsumeSuffix(std::string_view* s, std::string_view suffix) {
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if (!EndsWith(*s, suffix)) return false;
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s->remove_suffix(suffix.size());
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return true;
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}
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// Replaces `from` with `to` in `s`, once if `all == false`, or as many times as
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// there are matches if `all == true`.
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[[nodiscard]] std::string StringReplace(std::string_view s, std::string_view from,
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std::string_view to, bool all);
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} // namespace base
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} // namespace android
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