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//
// Copyright (C) 2020 Greg Landrum and T5 Informatics GmbH
//
// @@ All Rights Reserved @@
// This file is part of the RDKit.
// The contents are covered by the terms of the BSD license
// which is included in the file license.txt, found at the root
// of the RDKit source tree.
//
#include <RDGeneral/Invariant.h>
#include <map>
#include <boost/lexical_cast.hpp>
#include <boost/tokenizer.hpp>
#include <boost/format.hpp>
#include <algorithm>
typedef boost::tokenizer<boost::char_separator<char>> tokenizer;
namespace RDKit {
namespace MolEnumerator {
struct LinkNode {
unsigned int minRep = 0;
unsigned int maxRep = 0;
unsigned int nBonds = 0;
std::vector<std::pair<unsigned int, unsigned int>> bondAtoms;
};
namespace utils {
inline std::vector<LinkNode> getMolLinkNodes(
const ROMol &mol, bool strict = true,
const std::map<unsigned, Atom *> *atomIdxMap = nullptr) {
std::vector<LinkNode> res;
std::string pval;
if (!mol.getPropIfPresent(common_properties::molFileLinkNodes, pval)) {
return res;
}
std::vector<int> mapping;
boost::char_separator<char> pipesep("|");
boost::char_separator<char> spacesep(" ");
for (auto linknodetext : tokenizer(pval, pipesep)) {
LinkNode node;
tokenizer tokens(linknodetext, spacesep);
std::vector<unsigned int> data;
try {
std::transform(tokens.begin(), tokens.end(), std::back_inserter(data),
[](const std::string &token) -> unsigned int {
return boost::lexical_cast<unsigned int>(token);
});
} catch (boost::bad_lexical_cast &) {
std::ostringstream errout;
errout << "Cannot convert values in LINKNODE '" << linknodetext
<< "' to unsigned ints";
if (strict) {
throw ValueErrorException(errout.str());
} else {
BOOST_LOG(rdWarningLog) << errout.str() << std::endl;
continue;
}
}
// the second test here is for the atom-pairs defining the bonds
// data[2] contains the number of bonds
if (data.size() < 5 || data.size() < 3 + 2 * data[2]) {
std::ostringstream errout;
errout << "not enough values in LINKNODE '" << linknodetext << "'";
if (strict) {
throw ValueErrorException(errout.str());
} else {
BOOST_LOG(rdWarningLog) << errout.str() << std::endl;
continue;
}
}
node.minRep = data[0];
node.maxRep = data[1];
if (node.minRep == 0 || node.maxRep < node.minRep) {
std::ostringstream errout;
errout << "bad counts in LINKNODE '" << linknodetext << "'";
if (strict) {
throw ValueErrorException(errout.str());
} else {
BOOST_LOG(rdWarningLog) << errout.str() << std::endl;
continue;
}
}
node.nBonds = data[2];
if (node.nBonds != 2) {
if (strict) {
UNDER_CONSTRUCTION(
"only link nodes with 2 bonds are currently supported");
} else {
BOOST_LOG(rdWarningLog)
<< "only link nodes with 2 bonds are currently supported"
<< std::endl;
continue;
}
}
// both bonds must start from the same atom:
if (data[3] != data[5]) {
std::ostringstream errout;
errout << "bonds don't start at the same atom for LINKNODE '"
<< linknodetext << "'";
if (strict) {
throw ValueErrorException(errout.str());
} else {
BOOST_LOG(rdWarningLog) << errout.str() << std::endl;
continue;
}
}
if (atomIdxMap) {
// map the indices back to the original atom numbers
for (unsigned int i = 3; i <= 6; ++i) {
const auto aidx = atomIdxMap->find(data[i] - 1);
if (aidx == atomIdxMap->end()) {
std::ostringstream errout;
errout << "atom index " << data[i]
<< " cannot be found in molecule for LINKNODE '"
<< linknodetext << "'";
if (strict) {
throw ValueErrorException(errout.str());
} else {
BOOST_LOG(rdWarningLog) << errout.str() << std::endl;
continue;
}
} else {
data[i] = aidx->second->getIdx();
}
}
} else {
for (unsigned int i = 3; i <= 6; ++i) {
--data[i];
}
}
node.bondAtoms.push_back(std::make_pair(data[3], data[4]));
node.bondAtoms.push_back(std::make_pair(data[5], data[6]));
if (!mol.getBondBetweenAtoms(data[4], data[3]) ||
!mol.getBondBetweenAtoms(data[6], data[5])) {
std::ostringstream errout;
errout << "bond not found between atoms in LINKNODE '" << linknodetext
<< "'";
if (strict) {
throw ValueErrorException(errout.str());
} else {
BOOST_LOG(rdWarningLog) << errout.str() << std::endl;
continue;
}
}
res.push_back(std::move(node));
}
return res;
}
} // namespace utils
} // namespace MolEnumerator
} // namespace RDKit
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