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/* ----------------------------------------------------------------------- *
 * This file is part of GEL, http://www.imm.dtu.dk/GEL
 * Copyright (C) the authors and DTU Informatics
 * For license and list of authors, see ../../doc/intro.pdf
 * ----------------------------------------------------------------------- */

#include <string>
#include <list>
#include "string_utils.h"

using namespace std;

namespace Util
{
  string trim(const string& s, const string& wspaces)
  {
    int front = 0;
    int back = static_cast<int>(s.size() - 1);
    if(back < front)
      return string("");

    while(wspaces.find(s[front]) != wspaces.npos) ++front;
    while(wspaces.find(s[back]) != wspaces.npos) --back;
    int n = back - front + 1;
    if(n < 1)
      return string("");
    else
      return s.substr(front, n);    
  }

  string trim(const string& s)
  {
    return trim(s, " \t\n\r");
  }

  void split(const string& s, list<string>& result, const string& delim)
  {
    size_t begin = 0;
    size_t end = s.find(delim);
    while(end != s.npos)
    {
      result.push_back(s.substr(begin, end - begin));
      begin = end + delim.size();
      end = s.find(delim, begin);
    }
    if(s.size() > begin)
      result.push_back(s.substr(begin, s.size() - begin));    
  }

  void split(const string& s, list<string>& result)
  {
    return split(s, result, " ");
  }

  void trim_split(const string& s, list<string>& result, const string& delim)
  {
    size_t begin = 0;
    size_t end = s.find(delim);
    while(end != s.npos)
    {
      result.push_back(trim(s.substr(begin, end - begin)));
      begin = end + delim.size();
      end = s.find(delim, begin);
    }
    if(s.size() > begin)
      result.push_back(trim(s.substr(begin, s.size() - begin)));
  }

  void trim_split(const string& s, list<string>& result)
  {
    trim_split(s, result, " ");
  }

  void get_first(string& s, string& first)
  {
    size_t pos = s.find(" ");
    first = s.substr(0, pos);
    if(pos == s.npos)
      s = "";
    else
      s.erase(0, pos + 1);
  }

  void get_last(string& s, string& last)
  {
    size_t pos = s.rfind(" ");
    last = s.substr(pos + 1);
    if(pos == s.npos)
      s = "";
    else
      s.erase(pos + 1);
  }
}