You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
134 lines
4.8 KiB
134 lines
4.8 KiB
// Copyright (C) 2015 The Android Open Source Project
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#pragma once
|
|
|
|
#include <functional>
|
|
#include <iterator>
|
|
#include <sstream>
|
|
#include <string>
|
|
#include <string_view>
|
|
#include <vector>
|
|
|
|
#include <stddef.h>
|
|
|
|
#ifdef _WIN32
|
|
// Returns a pointer to the first occurrence of |needle| in |haystack|, or a
|
|
// NULL pointer if |needle| is not part of |haystack|.
|
|
// Intentionally in global namespace. This is already provided by the system
|
|
// C library on Linux and OS X.
|
|
extern "C" const void* memmem(const void* haystack, size_t haystack_len,
|
|
const void* needle, size_t needlelen);
|
|
#endif // _WIN32
|
|
|
|
namespace android {
|
|
namespace base {
|
|
|
|
// Iterates over a string's parts using |splitBy| as a delimiter.
|
|
// |splitBy| must be a nonempty string well, or it's a no-op.
|
|
// Otherwise, |func| is called on each of the splits, excluding the
|
|
// characters that are part of |splitBy|. If two |splitBy|'s occur in a row,
|
|
// |func| will be called on a StringView("") in between. See
|
|
// StringUtils_unittest.cpp for the full story.
|
|
template <class String>
|
|
void split(String str, String splitBy, std::function<void(const String&)> func) {
|
|
if (splitBy.empty()) return;
|
|
|
|
size_t splitSize = splitBy.size();
|
|
size_t begin = 0;
|
|
size_t end = str.find(splitBy);
|
|
|
|
while (true) {
|
|
func(str.substr(begin, end - begin));
|
|
if (end == std::string::npos) return;
|
|
begin = end + splitSize;
|
|
end = str.find(splitBy, begin);
|
|
}
|
|
}
|
|
|
|
// Splits a string into a vector of strings.
|
|
//
|
|
// The string is split at each occurrence of a character in delimiters.
|
|
//
|
|
// The empty string is not a valid delimiter list.
|
|
std::vector<std::string> Split(const std::string& s,
|
|
const std::string& delimiters);
|
|
|
|
// Trims whitespace off both ends of the given string.
|
|
std::string Trim(const std::string& s);
|
|
|
|
// Joins a container of things into a single string, using the given separator.
|
|
template <typename ContainerT, typename SeparatorT>
|
|
std::string Join(const ContainerT& things, SeparatorT separator) {
|
|
if (things.empty()) {
|
|
return "";
|
|
}
|
|
|
|
std::ostringstream result;
|
|
result << *things.begin();
|
|
for (auto it = std::next(things.begin()); it != things.end(); ++it) {
|
|
result << separator << *it;
|
|
}
|
|
return result.str();
|
|
}
|
|
|
|
// We instantiate the common cases in strings.cpp.
|
|
extern template std::string Join(const std::vector<std::string>&, char);
|
|
extern template std::string Join(const std::vector<const char*>&, char);
|
|
extern template std::string Join(const std::vector<std::string>&,
|
|
const std::string&);
|
|
extern template std::string Join(const std::vector<const char*>&,
|
|
const std::string&);
|
|
|
|
// Tests whether 's' starts with 'prefix'.
|
|
bool StartsWith(std::string_view s, std::string_view prefix);
|
|
bool StartsWith(std::string_view s, char prefix);
|
|
bool StartsWithIgnoreCase(std::string_view s, std::string_view prefix);
|
|
|
|
// Tests whether 's' ends with 'suffix'.
|
|
bool EndsWith(std::string_view s, std::string_view suffix);
|
|
bool EndsWith(std::string_view s, char suffix);
|
|
bool EndsWithIgnoreCase(std::string_view s, std::string_view suffix);
|
|
|
|
// Tests whether 'lhs' equals 'rhs', ignoring case.
|
|
bool EqualsIgnoreCase(std::string_view lhs, std::string_view rhs);
|
|
|
|
// Removes `prefix` from the start of the given string and returns true (if
|
|
// it was present), false otherwise.
|
|
inline bool ConsumePrefix(std::string_view* s, std::string_view prefix) {
|
|
if (!StartsWith(*s, prefix))
|
|
return false;
|
|
s->remove_prefix(prefix.size());
|
|
return true;
|
|
}
|
|
|
|
// Removes `suffix` from the end of the given string and returns true (if
|
|
// it was present), false otherwise.
|
|
inline bool ConsumeSuffix(std::string_view* s, std::string_view suffix) {
|
|
if (!EndsWith(*s, suffix))
|
|
return false;
|
|
s->remove_suffix(suffix.size());
|
|
return true;
|
|
}
|
|
|
|
// Replaces `from` with `to` in `s`, once if `all == false`, or as many times as
|
|
// there are matches if `all == true`.
|
|
[[nodiscard]] std::string StringReplace(std::string_view s,
|
|
std::string_view from,
|
|
std::string_view to,
|
|
bool all);
|
|
|
|
} // namespace base
|
|
} // namespace android
|