lokinet/llarp/util/str.cpp

#include <util/str.hpp>

#include <algorithm>
#include <cctype>
#include <cstring>
#include <string>
#include <set>

namespace llarp
{
  bool
  CaselessLessThan::operator()(string_view lhs, string_view rhs) const
  {
    const size_t s = std::min(lhs.size(), rhs.size());
    for(size_t i = 0; i < s; ++i)
    {
      auto l = std::tolower(lhs[i]);
      auto r = std::tolower(rhs[i]);

      if(l < r)
      {
        return true;
      }
      if(l > r)
      {
        return false;
      }
    }

    return lhs.size() < rhs.size();
  }

  bool
  IsFalseValue(string_view str)
  {
    static const std::set< string_view, CaselessLessThan > vals{"no", "false",
                                                                "0", "off"};

    return vals.count(str) > 0;
  }

  bool
  IsTrueValue(string_view str)
  {
    static const std::set< string_view, CaselessLessThan > vals{"yes", "true",
                                                                "1", "on"};

    return vals.count(str) > 0;
  }

  bool
  StrEq(const char* s1, const char* s2)
  {
    size_t sz1 = strlen(s1);
    size_t sz2 = strlen(s2);
    if(sz1 == sz2)
    {
      return strncmp(s1, s2, sz1) == 0;
    }

    return false;
  }

  constexpr static char whitespace[] = " \t\n\r\f\v";

  string_view
  TrimWhitespace(string_view str)
  {
    size_t begin = str.find_first_not_of(whitespace);
    if(begin == string_view::npos)
    {
      str.remove_prefix(str.size());
      return str;
    }
    str.remove_prefix(begin);

    size_t end = str.find_last_not_of(whitespace);
    if(end != string_view::npos)
      str.remove_suffix(str.size() - end - 1);

    return str;
  }
}  // namespace llarp