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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Computational Engine *
* *
* Copyright (c) 1999-2012, Ben Burton *
* For further details contact Ben Burton (bab@debian.org). *
* *
* 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 2 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, write to the Free *
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
* MA 02110-1301, USA. *
* *
**************************************************************************/
/* end stub */
#include <fstream>
#include "foreign/recogniser.h"
#include "triangulation/ntriangulation.h"
namespace regina {
namespace {
// Anonymous routine to write to the given output stream.
//
// PRE: All preconditions for writeRecogniser() have already been
// tested, and are known to be met.
bool writeRecogniser(std::ostream& out, NTriangulation& tri) {
// Write the header.
out << "triangulation" << std::endl;
// Write face gluings.
NFace* f;
NTetrahedron* tet;
NPerm4 vert;
for (unsigned i = 0; i < tri.getNumberOfFaces(); ++i) {
f = tri.getFace(i);
tet = f->getEmbedding(0).getTetrahedron();
vert = f->getEmbedding(0).getVertices();
out << 't' << (tri.tetrahedronIndex(tet) + 1)
<< '(' << (vert[0] + 1)
<< ',' << (vert[1] + 1)
<< ',' << (vert[2] + 1) << ") - ";
tet = f->getEmbedding(1).getTetrahedron();
vert = f->getEmbedding(1).getVertices();
out << 't' << (tri.tetrahedronIndex(tet) + 1)
<< '(' << (vert[0] + 1)
<< ',' << (vert[1] + 1)
<< ',' << (vert[2] + 1) << ')';
if (i != tri.getNumberOfFaces() - 1)
out << ',';
out << std::endl;
}
// Write the footer.
out << "end" << std::endl;
return true;
}
}
bool writeRecogniser(const char* filename, NTriangulation& tri) {
// Sanity checks.
if (! tri.isValid())
return false;
if (tri.hasBoundaryFaces())
return false;
// Write to file or stdout as appropriate.
if (filename && *filename) {
std::ofstream out(filename);
if (! out)
return 0;
return writeRecogniser(out, tri);
} else {
return writeRecogniser(std::cout, tri);
}
}
} // namespace regina
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