root/ROOT/StringUtils.hxx

0001 /// \file ROOT/StringUtils.hxx
0002 /// \ingroup Base StdExt
0003 /// \author Jonas Rembser <jonas.rembser@cern.ch>
0004 /// \date 2021-08-09
0005
0006 /*************************************************************************
0007  * Copyright (C) 1995-2019, Rene Brun and Fons Rademakers.               *
0008  * All rights reserved.                                                  *
0009  *                                                                       *
0010  * For the licensing terms see $ROOTSYS/LICENSE.                         *
0011  * For the list of contributors see $ROOTSYS/README/CREDITS.             *
0012  *************************************************************************/
0013
0014 #ifndef ROOT_StringUtils
0015 #define ROOT_StringUtils
0016
0017 #include <string_view>
0018
0019 #include <string>
0020 #include <vector>
0021 #include <numeric>
0022 #include <iterator>
0023
0024 namespace ROOT {
0025
0026 std::vector<std::string> Split(std::string_view str, std::string_view delims, bool skipEmpty = false);
0027
0028 /**
0029  * \brief Concatenate a list of strings with a separator
0030  * \tparam StringCollection_t Any container of strings (vector, initializer_list, ...)
0031  * \param[in] sep Separator inbetween the strings.
0032  * \param[in] strings container of strings
0033  * \return the sep-delimited concatenation of strings
0034  */
0035 template <class StringCollection_t>
0036 std::string Join(const std::string &sep, StringCollection_t &&strings)
0037 {
0038    if (strings.empty())
0039       return "";
0040    return std::accumulate(std::next(std::begin(strings)), std::end(strings), strings[0],
0041                           [&sep](auto const &a, auto const &b) { return a + sep + b; });
0042 }
0043
0044 std::string Round(double value, double error, unsigned int cutoff = 1, std::string_view delim = "#pm");
0045
0046 inline bool StartsWith(std::string_view string, std::string_view prefix)
0047 {
0048    return string.size() >= prefix.size() && string.substr(0, prefix.size()) == prefix;
0049 }
0050
0051 inline bool EndsWith(std::string_view string, std::string_view suffix)
0052 {
0053    return string.size() >= suffix.size() && string.substr(string.size() - suffix.size(), suffix.size()) == suffix;
0054 }
0055
0056 } // namespace ROOT
0057
0058 #endif