StringView.h

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// --------------------------------------------------------------------------
//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2021.
//
// This software is released under a three-clause BSD license:
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//    may be used to endorse or promote products derived from this software
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// $Maintainer: Timo Sachsenberg$
// $Authors: Marc Sturm $
// --------------------------------------------------------------------------
 
#pragma once
 
#include <OpenMS/CONCEPT/Types.h>
#include <OpenMS/OpenMSConfig.h>
#include <OpenMS/DATASTRUCTURES/String.h>
 
#include <algorithm> // for "min"
#include <string>
#include <cstring>
#include <vector>
 
class QString;
 
namespace OpenMS
{
 
  class OPENMS_DLLAPI StringView
  {
    public:
 
    // create view on string
    StringView() = default;
 
    // construct from other view
    StringView(const StringView&) = default;
 
    // copy assignment
    StringView& operator=(const StringView&) = default;
 
    // create view on string
    StringView(const std::string& s) : begin_(s.data()), size_(s.size())
    {
    }
 
    bool operator<(const StringView other) const
    {
      if (size_ < other.size_) return true;
 
      if (size_ > other.size_) return false;
 
      // same size
      // same sequence, if both Views point to the same start
      if (begin_ == other.begin_) return false;
 
      return strncmp(begin_, other.begin_, size_) < 0;
    }
 
    bool operator==(const StringView other) const
    {
      if (size_ != other.size_) return false;
 
      //same size
      // same sequence, if both Views point to the same start
      if (begin_ == other.begin_) return true;
 
      return strncmp(begin_, other.begin_, size_) == 0;
    }
 
    inline StringView substr(Size start, Size length) const
    {
      if (!size_) return *this;
 
      StringView sv(*this);
      sv.begin_ = begin_ + start;
      sv.size_ = std::min(length, sv.size_ - start);
      return sv;
    }
    
    inline Size size() const
    {
      return size_;
    }
 
    inline String getString() const
    {
      if (!size_) return String();
      return String(begin_, begin_ + size_);
    }
 
    private:
      const char* begin_;
      Size size_;
  };
  
} // namespace OpenMS