ListUtils.h

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// --------------------------------------------------------------------------
//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2022.
//
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//    may be used to endorse or promote products derived from this software
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// $Maintainer: Timo Sachsenberg $
// $Authors: Stephan Aiche, Chris Bielow $
// --------------------------------------------------------------------------

#pragma once

#include <OpenMS/DATASTRUCTURES/String.h>
#include <OpenMS/CONCEPT/Exception.h>
#include <OpenMS/OpenMSConfig.h>
#include <OpenMS/config.h>

#include <cmath>
#include <iterator>
#include <vector>
#include <algorithm>

namespace OpenMS
{

  typedef std::vector<Int> IntList;

  typedef std::vector<double> DoubleList;


  typedef std::vector<String> StringList;

  class OPENMS_DLLAPI ListUtils
  {
private:
    struct DoubleTolerancePredicate_
    {
      DoubleTolerancePredicate_(const double& target, const double& tolerance) :
        tolerance_(tolerance),
        target_(target)
      {}

      inline bool operator()(const double& value) const
      {
        return std::fabs(value - target_) < tolerance_;
      }

private:
      double tolerance_;
      double target_;
    };

public:
    template <typename T>
    static std::vector<T> create(const String& str, const char splitter = ',')
    {
      // temporary storage for the individual elements of the string
      std::vector<String> temp_string_vec;
      str.split(splitter, temp_string_vec);
      return create<T>(temp_string_vec);
    }

    template <typename T>
    static std::vector<T> create(const std::vector<String>& s);


    template <typename T>
    static std::vector<String> toStringList(const std::vector<T>& s)
    {
      StringList out;
      out.reserve(s.size());
      for (const auto& elem : s) out.push_back(elem);
      return out;
    }

    template <typename T, typename E>
    static bool contains(const std::vector<T>& container, const E& elem)
    {
      return find(container.begin(), container.end(), elem) != container.end();
    }

    static bool contains(const std::vector<double>& container, const double& elem, double tolerance = 0.00001)
    {
      return find_if(container.begin(), container.end(), DoubleTolerancePredicate_(elem, tolerance)) != container.end();
    }


    enum class CASE { SENSITIVE, INSENSITIVE};
    static bool contains(const std::vector<String>& container, String elem, const CASE cs)
    {
      if (cs == CASE::SENSITIVE) return contains(container, elem);
      // case insensitive ...
      elem.toLower();
      return find_if(container.begin(), container.end(), [&elem](String ce) {
        return elem == ce.toLower();
      }) != container.end();
    }

    template <typename T>
    static String concatenate(const std::vector<T>& container, const String& glue = "")
    {
      return concatenate< std::vector<T> >(container, glue);
    }

    template <typename T>
    static String concatenate(const T& container, const String& glue = "")
    {
      // handle empty containers
      if (container.empty()) return "";

      typename T::const_iterator it = container.begin();
      String ret = String(*it);
      // we have handled the first element
      ++it;
      // add the rest
      for (; it != container.end(); ++it)
      {
        ret += (glue + String(*it));
      }

      return ret;
    }

    template <typename T, typename E>
    static Int getIndex(const std::vector<T>& container, const E& elem)
    {
      typename std::vector<T>::const_iterator pos =
        std::find(container.begin(), container.end(), elem);
      if (pos == container.end()) return -1;

      return static_cast<Int>(std::distance(container.begin(), pos));
    }

  };

  namespace detail
  {
    template <typename T>
    T convert(const String& s);
  
    template<>
    inline Int32 convert(const String& s)
    {
      return s.toInt32();
    }
    template<>
    inline double convert(const String& s)
    {
      return s.toDouble();
    }
    template<>
    inline float convert(const String& s)
    {
      return s.toFloat();
    }
    template<>
    inline std::string convert(const String& s)
    {
        return static_cast<std::string>(s);
    }
  }

  template <typename T>
  inline std::vector<T> ListUtils::create(const std::vector<String>& s)
  {
    std::vector<T> c;
    c.reserve(s.size());
    for (std::vector<String>::const_iterator it = s.begin(); it != s.end(); ++it)
    {
      try
      {
        c.push_back(detail::convert<T>(String(*it).trim())); // succeeds only if the whole output can be explained, i.e. "1.3 3" will fail (which is good)
      }
      catch (...)
      {
        throw Exception::ConversionError(__FILE__, __LINE__, OPENMS_PRETTY_FUNCTION, String("Could not convert string '") + *it + "'");
      }
    }

    return c;
  }

  template <>
  inline std::vector<String> ListUtils::create(const std::vector<String>& s)
  {
    return s;
  }

} // namespace OpenMS