chi_misc_utils.cc

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#include "chi_utils.h"
 
#include <fstream>
 
#include "chi_log_exceptions.h"
 
namespace chi
{
// #################################################################
std::string StringLTrim(const std::string& s)
{
  size_t start = s.find_first_not_of(WHITESPACE);
  return (start == std::string::npos) ? "" : s.substr(start);
}
 
// #################################################################
std::string StringRTrim(const std::string& s)
{
  size_t end = s.find_last_not_of(WHITESPACE);
  return (end == std::string::npos) ? "" : s.substr(0, end + 1);
}
 
// #################################################################
std::string StringTrim(const std::string& s)
{
  return StringRTrim(StringLTrim(s));
}
 
// #################################################################
std::vector<std::string> StringSplit(const std::string& input,
                                     const std::string& delim /*=" "*/)
{
  constexpr size_t NPOS = std::string::npos;
  std::vector<std::string> output;
 
  std::string remainder = input;
  size_t first_scope = remainder.find_first_of(delim);
 
  while (first_scope != NPOS)
  {
    if (first_scope != 0) output.push_back(remainder.substr(0, first_scope));
 
    remainder = remainder.substr(first_scope + delim.size(), NPOS);
    first_scope = remainder.find_first_of(delim);
  }
  output.push_back(remainder);
 
  return output;
}
 
// #################################################################
std::string StringUpToFirstReverse(const std::string& input,
                                   const std::string& search_string)
{
  constexpr size_t NPOS = std::string::npos;
  std::string output = input;
  const size_t last_scope = input.find_last_of(search_string);
  if (last_scope != NPOS)
    output = input.substr(last_scope + search_string.size(), NPOS);
 
  return output;
}
 
void AssertReadibleFile(const std::string& file_name)
{
  std::ifstream file(file_name.c_str(), std::ifstream::in);
  ChiLogicalErrorIf(
    file.fail(),
    "Failed to open file \"" + file_name +
      "\"."
      "Either the file does not exist or you do not have read permissions.");
 
  file.close();
}
} // namespace chi_misc_utils