util.cpp

/*Copyright (c) 2019 Alexis Nasr && Franck Dary

 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:i

 The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.*/

#include "util.hpp"
#include "utf8.hpp"
#include <ctime>
#include <algorithm>

int util::printedLength(std::string_view s)
{
  return splitAsUtf8(s).size();
}

std::string_view util::getFilenameFromPath(std::string_view s)
{
  int indexOfSlash = s.find_last_of('/');
  return {s.data()+indexOfSlash+1, s.size()-1-indexOfSlash};
}

bool util::isSeparator(utf8char c)
{
  return c == ' ' || isIllegal(c);
}

bool util::isIllegal(utf8char c)
{
  return c == '\n' || c == '\t';
}

std::vector<std::string> util::split(std::string_view remaining, char delimiter)
{
  std::vector<std::string> result;

  for (auto firstDelimiterIndex = remaining.find_first_of(delimiter); firstDelimiterIndex != std::string_view::npos; firstDelimiterIndex = remaining.find_first_of(delimiter))
  {
    if (remaining[0] != delimiter)
      result.emplace_back(remaining.data(), firstDelimiterIndex);
    remaining = std::string_view(remaining.data()+firstDelimiterIndex+1, remaining.size()-1-firstDelimiterIndex);
  }

  if (remaining.size() > 0)
    result.emplace_back(remaining);

  return result;
}

util::utf8string util::splitAsUtf8(std::string_view s)
{
  utf8string result;
  const char * beginPtr = s.data();
  const char * currentPtr = beginPtr;
  const char * endPtr = s.data()+s.size();

  while (currentPtr < endPtr)
  {
    try {utf8::next(currentPtr, endPtr);}
    catch (std::exception &)
    {
      break;
    }
    if (currentPtr - beginPtr > 4 || currentPtr - beginPtr == 0)
      myThrow(fmt::format("Invalid utf8 character at index {}", beginPtr-s.data()));
    utf8char c;
    for (int i = 0; i < currentPtr - beginPtr; i++)
      ((char*)&c)[i] = beginPtr[i];
    beginPtr = currentPtr;
    result.push_back(c);
  }

  return result;
}

std::string util::shrink(const std::string & s, int printedSize)
{
  static const std::string filler = "…";

  if (printedLength(s) <= printedSize)
    return s;

  auto splited = splitAsUtf8(s);

  std::string result;
  std::string begin, end;
  int nbLoop = 0;

  while (printedLength(begin)+printedLength(end)+printedLength(filler) <= printedSize)
  {
    result = begin + filler + end;

    if (nbLoop % 2)
      end = fmt::format("{}{}", splited[splited.size()-1-(nbLoop/2)], end);
    else
      begin = fmt::format("{}{}", begin, splited[nbLoop/2]);

    ++nbLoop;
  }

  return result;
}

void util::warning(std::string_view message, const std::experimental::source_location & location)
{
  fmt::print(stderr, "WARNING ({}) : {}\n", location, message);
}

void util::error(std::string_view message, const std::experimental::source_location & location)
{
  fmt::print(stderr, "ERROR ({}) : {}\n", location, message);
  exit(1);
}

void util::error(const std::exception & e, const std::experimental::source_location & location)
{
  error(e.what(), location);
}

void util::myThrow(std::string_view message, const std::experimental::source_location & location)
{
  throw std::invalid_argument(fmt::format("from ({}) {}", location, message));
}

std::string util::int2HumanStr(int number)
{
  std::string nb = std::to_string(number);
  std::string result;

  for (unsigned int i = 0; i < nb.size(); i++)
  {
    result.push_back(nb[i]);
    if (((nb.size()-i-1) % 3 == 0) && i < nb.size()-1)
      result.push_back(' ');
  }

  return result;
}

bool util::doIfNameMatch(const std::regex & reg, std::string_view name, const std::function<void(const std::smatch &)> & f)
{
  std::smatch sm;
  std::string sname(name);
  std::regex_match(sname, sm, reg);

  if (sm.empty())
    return false;

  f(sm);

  return true;
}

std::string util::strip(const std::string & s)
{
  std::string striped;

  if (s.empty())
    return striped;

  std::size_t first = 0;
  while (first < s.size() and (s[first] == ' ' or s[first] == '\t'))
    ++first;

  std::size_t last = s.size()-1;
  while (last > first and (s[last] == ' ' or s[last] == '\t'))
    --last;

  return std::string(s.begin()+first, s.begin()+last+1);
}

std::vector<std::filesystem::path> util::findFilesByExtension(std::filesystem::path directory, std::string extension)
{
  std::vector<std::filesystem::path> files;

  for (auto entry : std::filesystem::directory_iterator(directory))
    if (entry.is_regular_file())
    {
      auto path = entry.path();
      if (path.extension() == extension)
        files.push_back(path);
    }

  return files;
}