string.h

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// Copyright (c) 2019 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 <util/spanparsing.h>
 
#include <array>
#include <cstdint>
#include <cstring>
#include <locale>
#include <sstream>
#include <string>
#include <string_view>
#include <vector>
 
void ReplaceAll(std::string &in_out, const std::string &search,
                const std::string &substitute);
 
[[nodiscard]] inline std::vector<std::string> SplitString(std::string_view str,
                                                          char sep) {
    return spanparsing::Split<std::string>(str, sep);
}
 
[[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;
}
 
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);
}
 
[[nodiscard]] inline bool ValidAsCString(const std::string &str) noexcept {
    return str.size() == strlen(str.c_str());
}
 
template <typename T> std::string ToString(const T &t) {
    std::ostringstream oss;
    oss.imbue(std::locale::classic());
    oss << t;
    return oss.str();
}
 
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_STRING_H