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/*
* Off_reader.h
* Created on: Nov 28, 2014
* This file is part of the Gudhi Library. The Gudhi library
* (Geometric Understanding in Higher Dimensions) is a generic C++
* library for computational topology.
*
* Author(s): David Salinas
*
* Copyright (C) 2014 INRIA Sophia Antipolis-M�diterran�e (France)
*
* This program 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.
*
* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef GUDHI_OFF_READER_H_
#define GUDHI_OFF_READER_H_
#include <sstream>
#include <iostream>
#include <iterator>
namespace Gudhi {
/**
* Read an off file and calls a visitor methods while reading it.
* An off file must have its first/snd line in this format :
* OFF
* num_vert num_faces num_edges
*
* A noff file must have its first/snd line in this format :
* nOFF
* dim num_vert num_faces num_edges
*
* The number of edges num_edges is optional and can be left to zero.
*/
class Off_reader{
public:
Off_reader(std::ifstream& stream):stream_(stream){
}
// Off_reader(const std::string& name):stream_(name){
// if(!stream_.is_open())
// std::cerr <<"could not open file \n";
// }
~Off_reader(){
stream_.close();
}
/**
* read an off file and calls the following methods :
* void init(int dim,int num_vertices,int num_faces,int num_edges); //num_edges may not be set
* void point(const std::vector<double>& point);
* void maximal_face(const std::list<int>& face);
* void done();
* of the visitor when reading a point or a maximal face.
*/
template<typename OffVisitor>
bool read(OffVisitor& off_visitor){
bool success_read_off_preambule = read_off_preambule(off_visitor);
if(!success_read_off_preambule) {
std::cerr <<"could not read off preambule\n";
return false;
}
bool success_read_off_points = read_off_points(off_visitor);
if(!success_read_off_points) {
std::cerr <<"could not read off points\n";
return false;
}
bool success_read_off_faces = read_off_faces(off_visitor);
if(!success_read_off_faces) {
std::cerr <<"could not read off faces\n";
return false;
}
off_visitor.done();
return success_read_off_preambule && success_read_off_points && success_read_off_faces;
}
private:
std::ifstream& stream_;
struct Off_info{
int dim;
int num_vertices;
int num_edges;
int num_faces;
};
Off_info off_info_;
template<typename OffVisitor>
bool read_off_preambule(OffVisitor& off_visitor){
std::string line;
if(!goto_next_uncomment_line(line)) return false;
bool is_off_file = (line.find("OFF") != std::string::npos);
bool is_noff_file = (line.find("nOFF") != std::string::npos);
if(!is_off_file && !is_noff_file) return false;
if(!goto_next_uncomment_line(line)) return false;
std::istringstream iss(line);
if(is_off_file){
off_info_.dim = 3;
if(!(iss >> off_info_.num_vertices >> off_info_.num_faces >> off_info_.num_edges))
return false;
}
else
if(!(iss >> off_info_.dim >> off_info_.num_vertices >> off_info_.num_faces >> off_info_.num_edges))
return false;
off_visitor.init(off_info_.dim,off_info_.num_vertices,off_info_.num_faces,off_info_.num_edges);
return true;
}
bool goto_next_uncomment_line(std::string& uncomment_line){
uncomment_line.clear();
do
std::getline(stream_, uncomment_line);
while(uncomment_line[0] == '%');
return (uncomment_line.size()>0 && uncomment_line[0] != '%');
}
template<typename OffVisitor>
bool read_off_points(OffVisitor& visitor){
int num_vertices_to_read = off_info_.num_vertices;
while(num_vertices_to_read--){
std::string line;
if(!goto_next_uncomment_line(line)) return false;
std::vector<double> point;
std::istringstream iss(line);
point.assign(std::istream_iterator<double>(iss),std::istream_iterator<double>());
// if(point.size() != off_info_.dim) return false;
visitor.point(point);
}
return true;
}
template<typename OffVisitor>
bool read_off_faces(OffVisitor& visitor){
std::string line;
while(goto_next_uncomment_line(line)){
std::istringstream iss(line);
int num_face_vertices;
iss >> num_face_vertices;
std::vector<int> face;
face.assign(std::istream_iterator<int>(iss),std::istream_iterator<int>());
if(!face.size() == off_info_.num_vertices) return false;
visitor.maximal_face(face);
}
return true;
}
};
} // namespace Gudhi
#endif /* GUDHI_OFF_READER_H_ */
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