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// Copyright (c) 2019-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_UTIL_STRING_H
#define BITCOIN_UTIL_STRING_H
#include <attributes.h>
#include <algorithm>
#include <array>
#include <cstring>
#include <locale>
#include <sstream>
#include <string>
#include <vector>
[[nodiscard]] inline std::string TrimString(const std::string& str, const std::string& pattern = " \f\n\r\t\v")
{
std::string::size_type front = str.find_first_not_of(pattern);
if (front == std::string::npos) {
return std::string();
}
std::string::size_type end = str.find_last_not_of(pattern);
return str.substr(front, end - front + 1);
}
[[nodiscard]] inline std::string RemovePrefix(const std::string& str, const std::string& prefix)
{
if (str.substr(0, prefix.size()) == prefix) {
return str.substr(prefix.size());
}
return str;
}
/**
* Join a list of items
*
* @param list The list to join
* @param separator The separator
* @param unary_op Apply this operator to each item in the list
*/
template <typename T, typename BaseType, typename UnaryOp>
auto Join(const std::vector<T>& list, const BaseType& separator, UnaryOp unary_op)
-> decltype(unary_op(list.at(0)))
{
decltype(unary_op(list.at(0))) ret;
for (size_t i = 0; i < list.size(); ++i) {
if (i > 0) ret += separator;
ret += unary_op(list.at(i));
}
return ret;
}
template <typename T>
T Join(const std::vector<T>& list, const T& separator)
{
return Join(list, separator, [](const T& i) { return i; });
}
// Explicit overload needed for c_str arguments, which would otherwise cause a substitution failure in the template above.
inline std::string Join(const std::vector<std::string>& list, const std::string& separator)
{
return Join<std::string>(list, separator);
}
/**
* Check if a string does not contain any embedded NUL (\0) characters
*/
[[nodiscard]] inline bool ValidAsCString(const std::string& str) noexcept
{
return str.size() == strlen(str.c_str());
}
/**
* Locale-independent version of std::to_string
*/
template <typename T>
std::string ToString(const T& t)
{
std::ostringstream oss;
oss.imbue(std::locale::classic());
oss << t;
return oss.str();
}
/**
* Check whether a container begins with the given prefix.
*/
template <typename T1, size_t PREFIX_LEN>
[[nodiscard]] inline bool HasPrefix(const T1& obj,
const std::array<uint8_t, PREFIX_LEN>& prefix)
{
return obj.size() >= PREFIX_LEN &&
std::equal(std::begin(prefix), std::end(prefix), std::begin(obj));
}
#endif // BITCOIN_UTIL_STRENCODINGS_H
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