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sequence.cpp

/* massXpert - the true massist's program.
   --------------------------------------
   Copyright(C) 2006,2007 Filippo Rusconi

   http://www.massxpert.org/massXpert

   This file is part of the massXpert project.

   The massxpert project is the successor to the "GNU polyxmass"
   project that is an official GNU project package(see
   www.gnu.org). The massXpert project is not endorsed by the GNU
   project, although it is released ---in its entirety--- under the
   GNU General Public License. A huge part of the code in massXpert
   is actually a C++ rewrite of code in GNU polyxmass. As such
   massXpert was started at the Centre National de la Recherche
   Scientifique(FRANCE), that granted me the formal authorization to
   publish it under this Free Software License.

   This software is free software; you can redistribute it and/or
   modify it under the terms of the GNU  General Public
   License version 3, as published by the Free Software Foundation.
   

   This software is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this software; if not, write to the

   Free Software Foundation, Inc.,

   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/


/////////////////////// Local includes
#include "sequence.hpp"
#include "polChemDef.hpp"


namespace massXpert
{

  //! Constructs a sequence
  /*! The sequence is in the form of a string of concatenated monomer
      codes. No quality check is performed.

    \param text sequence in the form of concatenated monomer codes.
  */
00052   Sequence::Sequence(const QString &text)
    : m_monomerText(text)
  {
  }


  //! Destroys the sequence.
00059   Sequence::~Sequence()
  {
    while(!m_monomerList.isEmpty())
      delete m_monomerList.takeFirst();
  }


  //! Sets the sequence text.
  /*!  \param text Monomer sequence as a string of monomer codes.
   */
  void
00070   Sequence::setMonomerText(const QString &text)
  {
    m_monomerText = text;
  }


  //! Appends text to the sequence text.
  /*!  \param text Monomer sequence as a string of monomer codes.
   */
  void
00080   Sequence::appendMonomerText(const QString &text)
  {
    if (text.isEmpty())
      return;
  
    m_monomerText += text;
  }


  //! Returns the sequence as a string of monomer codes.
  /*!  \return The sequence as a string.
   */
  const QString *
00093   Sequence::monomerText()
  {
    return &m_monomerText;
  }


  //! Returns the sequence as a list of monomers.
  /*!  \return The list of monomers.
   */
  const QList<const Monomer *> &
00103   Sequence::monomerList() const
  {
    return m_monomerList;
  }


  //! Returns the sequence as a list of monomers.
  /*!  \return The list of monomers.
   */
  QList<const Monomer *> *
00113   Sequence::monomerListPtr()
  {
    return &m_monomerList;
  }


  //! Returns the size of the sequence.
  /*! Returns the size of the sequence as the size of the list of
    monomers.
  
    \return The number of items in the list of monomers.
  */
  int 
00126   Sequence::size() const
  {
    return m_monomerList.size();
  }


  //! Removes all spaces, carriage returns and linefeeds.
  void 
00134   Sequence::unspacifyMonomerText()
  {
    // Removal of all spaces, carriage returns and linefeeds:
  
    for (int iter = m_monomerText.length() -1; iter >= 0 ; --iter)
      {
      QChar curChar = m_monomerText.at(iter);
      
      QChar::Category category = curChar.category();

      if(category == QChar::Separator_Space)
        m_monomerText.remove(iter, 1);

      else if (curChar == '\n')
        m_monomerText.remove(iter, 1);
      else if (curChar == '\r')
        m_monomerText.remove(iter, 1);
      }
  }


  //! Creates the string representation of the sequence.
  /*! The string representation of the sequence is created by iterating
    in the list of monomers and concatenating into one single string the
    monomer code of each iterated monomer. The generated string is
    stored in the member datum.

    \return The number of codes concatenated into the string.

    \sa makeMonomerList()
  */
  int 
00166   Sequence::makeMonomerText()
  {
    int iter = 0;
  
    m_monomerText.clear();
  
    for (iter = 0; iter < m_monomerList.size(); ++iter)
      m_monomerText.append(m_monomerList.at(iter)->code());

    return iter;
  }


  QString *
  Sequence::monomerText(int start, int end, bool withModif) const
  {
    int localStart = 0;
    int localEnd = 0;
  
    QString *p_text = new QString();

    if (size() == 0)
      return p_text;
    
    if (start > end)
      {
      localStart = end;
      localEnd = start;
      }
    else
      {
      localStart = start;
      localEnd = end;
      }
    
    if (localStart < 0)
      localStart = 0;

    if (localEnd < 0 || localEnd >= size())
      localEnd = size() - 1;
  
    QString text;
  
    for (int iter = localStart ; iter < localEnd + 1 ; ++iter)
      {
      const Monomer *monomer = m_monomerList.at(iter);
      
      if(withModif)
        {
          if (monomer->isModified())
            {
            for(int iter = 0; iter < monomer->modifList()->size();++iter)
              {
                text = QString("%1<%2>")
                  .arg(monomer->code())
                  .arg(monomer->modifList()->at(iter)->name());
              }
            }
          else
            text = monomer->code();
        }
      else
        text = monomer->code();
      
      p_text->append(text);
      }  

    return p_text;
  }


  QString *
  Sequence::monomerText(const CoordinateList &coordinateList, 
                       bool withModif, bool delimitedRegions) const
  {
    QString *p_text = new QString();
    
    for (int iter = 0; iter < coordinateList.size(); ++iter)
      {
      // New coordinates instance we are iterating into.
      Coordinates *coordinates = coordinateList.at(iter);

      QString *tempString = monomerText(coordinates->start(),
                                 coordinates->end(),
                                 withModif);
      
      if(delimitedRegions)
        *p_text += QString("Region %1: %2\n")
          .arg(coordinates->positionsAsText())
          .arg(*tempString);
      else
        *p_text += *tempString;
      
      delete(tempString);
      }
    
    *p_text += QString("\n");
    
    return p_text;
  }
  

  //! Creates a list of monomers from the string sequence.
  /*! The creation of the list of monomers is performed by iterating in
    the sequence text form and for each monomer code parsed a monomer is
    created by looking into a list of reference monomers(belonging to
    the polymer chemistry definition used at construction).
  
    \param reset If true, the list of monomers is first cleared.

    \param polChemDef Polymer chemistry definition to be used to craft
    the fully qualified monomers using their code in the text
    representation of the sequence.

    \param errorList list of int where to store the indices where errors
    are encountered. Defaults to 0, in which case no storing of the
    indices occurs.

    \return The size of the monomer list or -1 if an error occurred.
  */
  int 
00287   Sequence::makeMonomerList(const PolChemDef *polChemDef, bool reset,
                       QList<int> *errorList)
  {
    if (!polChemDef)
      return -1;
    
    int index = 0;
    int ret = -1;
    QString err;
    QString code;
  
    // If error indices are to be stored, the list MUST be empty.
    if (errorList)
      Q_ASSERT(errorList->size() == 0);
  
    if (reset)
      {
      while(!m_monomerList.isEmpty())
        delete m_monomerList.takeFirst();
      }
  
    unspacifyMonomerText();
  
    ret = nextCode(&code, &index, &err, polChemDef->codeLength());
  
    const QList<Monomer*> &refList = polChemDef->monomerList();

    while(1)
      {
      if(ret < 0)
        {
          // There was an error in the parsed code. Store the index.
          if (errorList)
            {
            errorList->append(index);
            ++index;
            ret = nextCode(&code, &index, &err, polChemDef->codeLength());
            continue;
            }
          else
            {
            break;
            }
        }
          
      if(ret == 0)
        break;
      
      Monomer *monomer = new Monomer(polChemDef, "NOT_SET");

      if(Monomer::isCodeInList(code, refList, monomer) == -1)
        {
          delete monomer;

          if (errorList)
            {
            errorList->append(index);
            ++index;
            ret = nextCode(&code, &index, &err, polChemDef->codeLength());
            continue;
            }
          else
            {
            return -1;
            }
        }
      
      m_monomerList.append(monomer);
      
      ++index;
      ret = nextCode(&code, &index, &err, polChemDef->codeLength());
      }
    // End of 
    // while(1)
  
    if (errorList)
      {
      if(errorList->size())
        return -1;
      }
  
    if (ret == -1)
      return -1;
  
    return m_monomerList.size();
  }


  //! Returns the next code occurring in the sequence.
  /*! Returns the code occurring in the sequence starting at index \p
    index.
  
    \param code Location where to store the code to return to caller.
  
    \param index Index at which parsing for a new code in the sequence has
    to start.
  
    \param err Location where to store the erroneous characters that
    might be encountered during parsing of the sequence.
  
    \param codeLength Number of authorized characters to qualify a
    monomer code.

    \return the length(in characters) of the returned code or -1 if an
    error occurred.
  */
  int
00394   Sequence::nextCode(QString *code, int *index, QString *err, int codeLength)
  {
    QString newCode;
    int iter = 0;
  
    // We get a sequence of monomer codes(like "LysArgGlu" for example)
    // and we have to return the next code starting from *index. Note
    // that the sequence must not contain invalid characters. The
    // invalid characters might be placed in err for further scrutiny by
    // the caller.

    // Returns the count of actually parsed characters in the string
    // newCode(copied to 'code' param). If an error occurs -1 is
    // returned and the faulty character is copied in 'err'. 'index' is
    // updated with the index of the last valid character parsed for
    // current code.

    Q_ASSERT(code);
    Q_ASSERT(index);
    Q_ASSERT(err);

    code->clear();
    err->clear();
  
    int length = m_monomerText.length();
  
    while(1)
      {
      if(iter >= codeLength)
        {
          --iter;
          break;
        }
      
      if(iter + *index >= length)
        break;
      
      QChar curChar = m_monomerText.at(iter + *index);
      
      if(!curChar.isLetter())
        {
          //        qDebug() << __FILE__ << __LINE__
          //                  << "The character is not a letter:"
          //                << curChar;
        
          --iter;
        
          *err = curChar;
        
          return -1;
        }
      
      bool isLower =(curChar.category() == QChar::Letter_Lowercase);
      
      if(iter == 0)
        {
          if (isLower)
            {
//          qDebug() << "First character of monomer code might not be"
//                  << "lower case; sequence is"
//                  << m_monomerText.toAscii();
            
            *err = curChar;
            
            return -1;
            }
          else
            {
            // Good, first char is uppercase.
            newCode += curChar;
            }
        }
      else //(iter != 0)
        {
          // We are not in our first iteration. So either the current
          // character is lowercase and we are just continuing to
          // iterate into a multi-char monomer code, or the current
          // character is uppercase, in which case we are starting to
          // iterate in a new monomer code.

          if (isLower)
            newCode += curChar;
          else
            {
            // Decrement iter, because this round was for nothing:
            // we had "invaded" the next monomer code in sequence,
            // which we must not do.

            --iter;
            break;
            }
        }

      ++iter;
      }
  
    // We finished parsing at most codeLength characters out of
    // 'm_monomerText', so we have a valid code in the 'code' variable. We
    // can also compute a new index position in the sequence and return
    // the number of characters that we effectively parsed. Note that
    // the caller will be responsible for incrementing the 'index' value
    // by one character unit so as not to reparse the last characters of
    // the sent 'code' object.

    *index = *index + iter;
    *code = newCode;
    err->clear();
  
    return code->length();
  }
  


  // Returns -1 if an error was encountered, 0 if no match could be
  // found, 1 if a match was found.
  bool
  Sequence::findForwardMotif(Sequence *motif, 
                        const PolChemDef *polChemDef,
                        int *index)
  {
    Q_ASSERT(motif);
    Q_ASSERT(polChemDef);
    Q_ASSERT(index);
  
    if (*index < 0)
      return -1;
    if (*index >= size())
      return -1;
  
    int motifSize = motif->size();
  
    // If motif's length is 0, then nothing to search for, return
    // unmodified 'index'.
    if (!motifSize)
      return 0;
  
    // Simple optimization, if index + size of motif is greater then
    // size of sequence, return right away.
    if (*index + motifSize >= size())
      return 0;
  
    // First, make a monomerList.
    if (motif->makeMonomerList(polChemDef) == -1)
      return -1;

    // Compare *this sequence with the one in 'motif', starting at index
    // 'index' in *this sequence and 0 in 'motif'.
  
    bool matched = false;
    int matchIndex = 0;
  
    for (int iter = *index; iter < size(); ++iter)
      {
      matched = false;
      int jter = 0;
      
      const Monomer *monomer = at(iter);
      const Monomer *motifMonomer = motif->at(jter);
      
      // We do not compare with operator == because that comparison
      // would involve the comparison of modifications inside the
      // monomers, which would not work here.
      if(monomer->code() != motifMonomer->code())
        continue;
      
      // An easy check is to see if the number of remaining monomers
      // in the polymer sequence is compatible with the number of
      // monomers still to be matched in the find array.  Imagine the
      // sequence of the polymer ends like this: ==========JTOUTVU and
      // the sequence to be searched for is : TVUL What we see is that
      // the T of the TVU of the sequence matches; however we can stop
      // the search right away because there is a 'L' in the search
      // pattern that is not present in the end part of the
      // sequence. This is exactly what is checked below.  Note that
      // this check makes SURE that at the end of the second inner
      // loop, when we get out of it, the sole reason we may not
      // consider that the match did not occur is because actually two
      // monomers differred and not because anybody came out of the
      // borders of the sequence in neither the array of the sequence
      // to be searched, nor the array of the polymer sequence. This
      // makes it very easy to assess if a match occurred or not.

      if(size() - iter < motif->size() - jter)
        {
          // Note that if it were ==, then it would have been possible
          // that the sequence "just-in-time" match prior to ending of
          // the polymer sequence array. Do not forget that we are in
          // forward mode, thus we can break immediately, because we
          // are certain that we won't have any chance to find the
          // sequence downstream of current index.
        
          matched = FALSE;
          break;
        }

      matchIndex = iter;

      // We have to set the matched boolean to true, because if the
      // motif to find is one monomer-long, then the loop below will
      // not be entered, and we'll fail to know that the match
      // occurred later on.
      matched = true;
      
      // Now that we have our anchoring point in the *this sequence,
      // let's iterate in the motif, and check if the identity in
      // sequence goes along.
      
      for(int kter = jter + 1 ; kter < motif->size() ; ++kter)
        {
          // At first run in this loop, we are in the second cell of
          // the find list, which means that we should have jter ==
          // 1. And we should compare its contents with those of the
          // cell in the sequence list at index(iter + jter).
        
          monomer = at(iter + kter);
          motifMonomer = motif->at(kter);
        
          // We do not compare with operator == because that
          // comparison would involve the comparison of modifications
          // inside the monomers, which would not work here.
          if (monomer->code() == motifMonomer->code())
            {
            // The monomers still match. 
            matched = true;
            continue;
            }
          else
            {
            matched = false;
            break;
            }
        }
      // End of 
      // for (int kter = jter + 1 ; kter < motif->size() ; ++kter)
      
      // At this point, we either have normally extinguished the run
      // in the inner loop, or we have gone out of it before its
      // normal termination. In either case, we have to test if the
      // match occurred or not.

      // Check if the match did NOT occur:
     
      if(!matched)
        {
          // We just continue with the outer loop, that is we continue
          // searching in the polymer sequence for a match with the
          // first monomer in the motif.
        
          continue;
        }
      else 
        {
          // The match indeed occurred.
        
          *index = matchIndex;
          return 1;
        }
      }
    // End of
    // for (int iter = *index; iter < size(); ++iter)


    // No match could be achieved, we have to let the caller function
    // know this in a durable manner : returning 0.

    return 0;
  }



  //! Returns the monomer at index \p index.
  /*! 
  
    \param index index of the monomer to return in the list of
    monomers. Must comply with the boundaries of the monomer list(that is
    be >= 0 and < list.size()).

    \return a pointer to the monomer.
  */
  const Monomer *
00674   Sequence::at(int index) const
  {
//     qDebug() << __FILE__ << __LINE__ << "In call at() with value:"
//          << index ;

    Q_ASSERT(index >= 0);
    Q_ASSERT(index < m_monomerList.size());
  
    return m_monomerList.at(index);
  }


  int
  Sequence::monomerIndex(const Monomer *monomer)
  {
    for (int iter = 0; iter < m_monomerList.size(); ++iter)
      {
      if(m_monomerList.at(iter) == monomer)
        return iter;
      }
  
    return -1;
  }


  //! Inserts the monomer at index \p index.
  /*! Assertions ensure that \p index is not less than 0 and not greater
    than sequence size as reported by size().

    This means that a monomer can only be inserted from a sequence if
    the sequence is at least in the form of a list of monomers.
  
    \param monomer dynamically allocated monomer. Assertion insures that
    this pointer is non-0.
  
    \param index Index of monomer to insert.
  
    \return Always true.
  */
  bool 
00714   Sequence::insertMonomerAt(const Monomer *monomer, int index)
  {
    Q_ASSERT(monomer);
    Q_ASSERT(index > -1 && index <= size());
    
    m_monomerList.insert(index, monomer);
  
    return true;
  }


  bool
  Sequence::prepareMonomerRemoval(const Monomer *monomer)
  {
    return true;
  }


  //! Removes the monomer at index \p index.
  /*! Assertions ensure that \p index is not less than 0 and not equal
    or greater than sequence size as reported by size().  

    This means that a monomer can only be removed from a sequence if the
    sequence is at least in the form of a list of monomers.
  
    \param index Index of monomer to remove.
  
    \return Always true.
  */
  bool 
00744   Sequence::removeMonomerAt(int index)
  {
    Q_ASSERT(index > -1);
    Q_ASSERT(index < size());
  
    const Monomer *monomer = at(index);
  
    if (!prepareMonomerRemoval(monomer))
      return false;
  
    m_monomerList.removeAt(index);
  
    delete monomer;
  
    return true;
  }


  bool
  Sequence::validate(const PolChemDef *polChemDef)
  {
    Q_ASSERT(polChemDef);
    
    if (makeMonomerList(polChemDef) > - 1)
      return true;
  
    return false;
  }

  quint16 
  Sequence::checksum(int startIdx, int endIdx, bool withModifs) const
  {
    if (!size())
      return 0;
    
    QString *text = monomerText(startIdx, endIdx, withModifs);
    
    QByteArray bytes = text->toUtf8();
    
    quint16 checksum = qChecksum(bytes.data(),  bytes.size());
    
//     qDebug() << __FILE__ << __LINE__
//         << "checksum:" << checksum;
    
    return checksum;
  }
  

} // namespace massXpert

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