suStringTokens.h

/*
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    _____  __ _\______   \_____ _______  ______ __________\   \/  /
   /     \|  |  \     ___/\__  \\_  __ \/  ___// __ \_  __ \     / 
  |  Y Y  \  |  /    |     / __ \|  | \/\___ \\  ___/|  | \/     \ 
  |__|_|  /____/|____|    (____  /__|  /____  >\___  >__| /___/\  \
        \/                     \/           \/     \/           \_/
                                       Copyright (C) 2013 Ingo Berg
                                       All rights reserved.

  muParserX - A C++ math parser library with array and string support
  Copyright (c) 2013, Ingo Berg
  All rights reserved.

  Redistribution and use in source and binary forms, with or without 
  modification, are permitted provided that the following conditions are met:

   * Redistributions of source code must retain the above copyright notice, 
     this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright notice, 
     this list of conditions and the following disclaimer in the documentation 
     and/or other materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
  POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef SU_STRING_TOKENS_H
#define SU_STRING_TOKENS_H

#include <stdexcept>
#include <sstream>
#include <string>
#include <vector>


namespace su
{

struct TokenNotFound : public std::runtime_error
{
  TokenNotFound() : std::runtime_error("Token not found") {};
};

//---------------------------------------------------------------------------
//
//  Deklaration:  StringTokens
//
//  Zweck:  Klasse zum Zerlegen eines durch beliebige Trennungszeichen
//          (Tokens) geteilten Strings. Die Teilstrings werden in einem
//          vector abgelegt und können über ihren Index, oder eine
//          Suchfunktion angesprochen werden.
//
//  Einschränkungen:  Die Klasse ist als Template geschrieben. Der Template
//                    Parameter entspricht dem Typ des Ausgangsstringes.
//
//---------------------------------------------------------------------------

template<typename TData>
/* final */ class StringTokens
{
public:
        typedef TData string_type;
        typedef typename TData::value_type char_type;

private:    
        typedef std::vector<string_type> storage_type;

public:

    //--- Konstruktor -----------------------------------------------------------
    StringTokens(const string_type &a_sInput, const string_type &a_sDelim = " ")
      :m_delimiter(a_sDelim)
      ,m_tokens()
    {
      Tokenize(a_sInput, a_sDelim);
    }

    //--- Default Konstruktor ---------------------------------------------------
    StringTokens()
      :m_delimiter(string_type(" "))
      ,m_tokens()
    {}

    //--- Destruktor ------------------------------------------------------------
   ~StringTokens()
    {}

    //---------------------------------------------------------------------------
    void Tokenize(const string_type &a_sInput, const string_type &a_sDelim = " ")
    {
      string_type buf(a_sInput);

      int  j = 0;
      for (int i=0; i<(int)buf.length(); ++i)
      {
        if ( a_sDelim.find(buf[i])!=buf.npos )
        {
          if (i!=j)
            m_tokens.push_back( TData(buf.substr(j, i-j).c_str()) );
          j = i+1;
        }
      }

      if ( j < (int)(buf.length()) )
        m_tokens.push_back( string_type(buf.substr(j).c_str()) );
    }

    //---------------------------------------------------------------------------
    typename const storage_type& Get() const
    {
      return m_tokens;
    }

    //---------------------------------------------------------------------------
    unsigned int Count() const
    {
      return static_cast<unsigned int>(m_tokens.size());
    }

    //---------------------------------------------------------------------------
    // Zweck:  Rückgabe des Tokens, das an idx'ter Stelle gefunden wurde.
    //         wird ein Index angegeben, der nicht der Tokenanzahl
    //         entspricht, so wird eine Exception ausgelöst.
    const TData& operator[](unsigned int idx) const
    {
      try
      {
        return m_tokens.at(idx);
      }
      catch(std::out_of_range&)
      {
        throw TokenNotFound();
      }
    }

    //---------------------------------------------------------------------------
    TData& operator[](unsigned idx)
    {
      try
      {
        return m_tokens.at(idx);
      }
      catch(std::out_of_range&)
      {
        throw TokenNotFound();
      }
    }

    //---------------------------------------------------------------------------
    int IndexOf(const TData &str) const
    {
      storage_type::const_iterator  item, 
                                    b = m_tokens.begin(), 
                                    e = m_tokens.end();
                                       
      item = std::find(b, e, str);
      return (item == e) ? -1 : item-b;
    }


private:
    StringTokens(const StringTokens &a_Tokens);
    StringTokens &operator=(const StringTokens &a_Tokens);

    string_type  m_delimiter;
    storage_type  m_tokens;
};

} // end of namespace

#endif