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/*
  This file is part of "Vidjil" <http://bioinfo.lifl.fr/vid>
  Copyright (C) 2011, 2012, 2013 by Bonsai bioinformatics at LIFL (UMR CNRS 8022, Université Lille) and Inria Lille
  Contributors: Mathieu Giraud <mathieu.giraud@lifl.fr>, Mikaël Salson <mikael.salson@lifl.fr>, David Chatel

  "Vidjil" is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  "Vidjil" 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 "Vidjil". If not, see <http://www.gnu.org/licenses/>
*/

#include <fstream>
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <cctype>
#include <stdexcept>
#include "fasta.h"

Fasta::Fasta(){
}

Fasta::Fasta(const string &input, 
	     int extract_field, string extract_separator,
	     ostream &out) 
{
  if (!input.size()) // Do not open empty files (D germline if not segmentD)
    return ;

  // oout = out;
  this -> extract_field = extract_field ;
  this -> extract_separator = extract_separator ;

  ifstream is(input.c_str());

  if (is.fail())
    {
      out << "  !! Error in opening file: " << input << endl ;
      exit(1);
    }

  out << "  <== " << input << endl ;

  while (is.good()) {
    is >> *this;
  }
  is.close();

  out << "      " << total_size << " bp in " << size() << " sequences" << endl ;
}

int Fasta::size() const{ return (int)reads.size(); }
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list<Sequence> Fasta::getAll() const {
  list<Sequence> reads;

  for (int i=0; i < size(); i++) {
    reads.push_back(read(i));
  }

  return reads;
}
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const string& Fasta::label(int index) const{ return reads[index].label; }
const string& Fasta::label_full(int index) const{ return reads[index].label_full; }
const Sequence& Fasta::read(int index) const {return reads[index];}
const string& Fasta::sequence(int index) const{ return reads[index].sequence; }

// OnlineFasta

OnlineFasta::OnlineFasta(int extract_field, string extract_separator):
  input(NULL), extract_field(extract_field), extract_separator(extract_separator){}

OnlineFasta::OnlineFasta(const string &input, 
                         int extract_field, string extract_separator)
  :input(new ifstream(input.c_str())), 
  extract_field(extract_field), 
  extract_separator(extract_separator)
{
  if (this->input->fail()) {
    throw ios_base::failure("!! Error in opening file "+input);
  }
  input_allocated = true;
  init();
}

OnlineFasta::OnlineFasta(istream &input, 
                         int extract_field, string extract_separator)
  :extract_field(extract_field), 
  extract_separator(extract_separator)
{
  this->input = &input;
  input_allocated = false;
  init();
}

OnlineFasta::OnlineFasta(const OnlineFasta &of) {
  current = of.current;
  input = of.input;
  extract_field = of.extract_field;
  extract_separator = of.extract_separator;
  line = of.line;
  input_allocated = false;
  line_nb = of.line_nb;
}

OnlineFasta::~OnlineFasta() {
  if (input_allocated)
    delete input;
}

void OnlineFasta::init() {
  line_nb = 0;
  line = getInterestingLine();
}

size_t OnlineFasta::getLineNb() {
  return line_nb;
}

Sequence OnlineFasta::getSequence() {
  return current;
}

bool OnlineFasta::hasNext() {
  return (! input->eof()) || line.length() > 0;
}

void OnlineFasta::next() {
  fasta_state state = FASTX_UNINIT;

  // Reinit the Sequence object
  current.label_full.erase();
  current.label.erase();
  current.sequence.erase();
  current.quality.erase();

  if  (hasNext()) {
    switch(line[0]) {
    case '>': state=FASTX_FASTA; break;
    case '@': state=FASTX_FASTQ_ID; break;
    default: 
      throw runtime_error("The file seems to be malformed!");
    }
    
    // Identifier line
    current.label_full = line.substr(1);
    current.label = extract_from_label(current.label_full, extract_field, extract_separator);

    line = getInterestingLine();
    while (hasNext() && ((state != FASTX_FASTA || line[0] != '>')
                         && (state != FASTX_FASTQ_QUAL || line[0] != '@'))) {

      if (hasNext()) {
        switch(state) {
        case FASTX_FASTA: case FASTX_FASTQ_ID:
          // Sequence
          current.sequence += line;
          break;
        case FASTX_FASTQ_SEQ:
          // FASTQ separator between sequence and quality
          assert(line[0] == '+');
          break;
        case FASTX_FASTQ_SEP:
          // Reading quality
          current.quality = line;
          break;
        default:
          throw runtime_error("Unexpected state after reading identifiers line");
        }
        if (state >= FASTX_FASTQ_ID && state <= FASTX_FASTQ_SEP)
          state = (fasta_state)(((int)state) + 1);
      } else {
        unexpectedEOF();
      }
      line = getInterestingLine();
    }

    if (state >= FASTX_FASTQ_ID && state < FASTX_FASTQ_QUAL) 
      unexpectedEOF();

    // Sequence in uppercase
    transform(current.sequence.begin(), current.sequence.end(), current.sequence.begin(), (int (*)(int))toupper);
  } else
    unexpectedEOF();
}

OnlineFasta& OnlineFasta::operator=(const OnlineFasta&of) {
  current = of.current;
  line = of.line;
  input = of.input;
  extract_field = of.extract_field;
  extract_separator = of.extract_separator;
  return *this;
}

string OnlineFasta::getInterestingLine() {
  string line;
  while (line.length() == 0 && hasNext() && getline(*input, line)) {
    line_nb++;
    remove_trailing_whitespaces(line);
  }
  return line;
}

void OnlineFasta::unexpectedEOF() {
  throw runtime_error("Unexpected EOF while reading FASTA/FASTQ file");
}

// Operators

istream& operator>>(istream& in, Fasta& fasta){
	string line;
	Sequence read;
        OnlineFasta of(in, fasta.extract_field, fasta.extract_separator);
	fasta.total_size = 0 ;

        while (of.hasNext()) {
          of.next();
          fasta.reads.push_back(of.getSequence());
          fasta.total_size += of.getSequence().sequence.size();
        }
	return in;
}

ostream& operator<<(ostream& out, Fasta& fasta){
	for(int i = 0 ; i < fasta.size() ; i++){
          out << fasta.read(i) << endl;
	}
	return out;
}

ostream &operator<<(ostream &out, const Sequence &seq) {
  out << ">" << seq.label << endl;
  out << seq.sequence << endl;
  return out;
}