pub_soft/rdkit
3
0
Fork 0
mirror of https://github.com/rdkit/rdkit.git synced 2026-06-06 22:39:55 +08:00
Code Issues Packages Projects Releases Wiki Activity
Files
f3fbef45c58751a633fea2b60d1fc28c26dafbfb
rdkit/Code/GraphMol/SmilesParse/SmilesWrite.cpp
Greg Landrum f3fbef45c5 update copyright statements
2010-09-26 17:04:37 +00:00

470 lines
14 KiB
C++
Executable File
Raw Blame History

// $Id$
//
// Copyright (C) 2002-2010 Greg Landrum and Rational Discovery LLC
//
// @@ 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 "SmilesWrite.h"
#include <GraphMol/RDKitBase.h>
#include <RDGeneral/types.h>
#include <GraphMol/Canon.h>
#include <boost/lexical_cast.hpp>
#include <boost/foreach.hpp>
#include <sstream>
#include <map>
#include <list>
namespace RDKit{
namespace SmilesWrite{
const int atomicSmiles[] = {5,6,7,8,9,15,16,17,35,53,-1};
bool inOrganicSubset(int atomicNumber){
unsigned int idx=0;
while( atomicSmiles[idx]<atomicNumber &&
atomicSmiles[idx]!=-1){
++idx;
}
if(atomicSmiles[idx]==atomicNumber){
return true;
}
return false;
}
std::string GetAtomSmiles(const Atom *atom,bool doKekule,const Bond *bondIn){
PRECONDITION(atom,"bad atom");
int i;
static bool firstCall=true;
static INT_VECT atomicSmilesVect;
if(firstCall){
i = 0;
while(atomicSmiles[i] != -1){
atomicSmilesVect.push_back(atomicSmiles[i]);
i++;
}
firstCall = false;
}
std::stringstream res;
int fc = atom->getFormalCharge();
int num = atom->getAtomicNum();
double massDiff=fabs(PeriodicTable::getTable()->getAtomicWeight(num) -
atom->getMass());
bool needsBracket=false;
std::string symb;
symb = atom->getSymbol();
if(inOrganicSubset(num)){
// it's a member of the organic subset
if(!doKekule && atom->getIsAromatic() && symb[0] < 'a') symb[0] -= ('A'-'a');
// -----
// figure out if we need to put a bracket around the atom,
// the conditions for this are:
// - formal charge specified
// - the atom has a nonstandard valence
// - chirality present and writing isomeric smiles
// - non-default isotope and writing isomeric smiles
const INT_VECT &defaultVs=PeriodicTable::getTable()->getValenceList(num);
int totalValence= atom->getExplicitValence()+atom->getImplicitValence();
bool nonStandard;
nonStandard = std::find(defaultVs.begin(),defaultVs.end(),
totalValence)==defaultVs.end();
// another type of "nonstandard" valence is an aromatic N with
// explicit Hs indicated:
if(num==7 && atom->getIsAromatic() && atom->getNumExplicitHs()){
nonStandard=true;
}
if(atom->getNumRadicalElectrons()){
nonStandard=true;
}
if(fc || nonStandard){
needsBracket=true;
}
if(atom->getOwningMol().hasProp("_doIsoSmiles")){
if( atom->getChiralTag()!=Atom::CHI_UNSPECIFIED ){
needsBracket = true;
} else if(massDiff>0.1){
needsBracket=true;
}
}
} else {
needsBracket = true;
}
if( needsBracket ) res << "[";
if(massDiff>0.1 && atom->getOwningMol().hasProp("_doIsoSmiles")){
int iMass=static_cast<int>(atom->getMass()+.1);
res <<iMass;
}
res << symb;
bool chiralityIncluded=false;
if(atom->getOwningMol().hasProp("_doIsoSmiles") &&
atom->getChiralTag()!=Atom::CHI_UNSPECIFIED ){
INT_LIST trueOrder;
atom->getProp("_TraversalBondIndexOrder",trueOrder);
#ifdef VERBOSE_CANON
std::cout << "\tatom: " << atom->getIdx() << " | ";
std::copy(trueOrder.begin(),trueOrder.end(),
std::ostream_iterator<int>(std::cout,", "));
std::cout << std::endl;
std::cout << "\t ---- | " ;
ROMol::OEDGE_ITER beg,end;
boost::tie(beg,end) = atom->getOwningMol().getAtomBonds(atom);
ROMol::GRAPH_MOL_BOND_PMAP::type pMap = atom->getOwningMol().getBondPMap();
while(beg!=end){
std::cout <<pMap[*beg]->getIdx()<<", ";
++beg;
}
std::cout << std::endl;
#endif
int nSwaps;
#if 0
if( !atom->hasProp("_CIPCode") && atom->hasProp("_CIPRank") ) {
// this is a special case where the atom has stereochem indicated
// but isn't a chiral center. This can happen in ring stereochem
// situations. Instead of using the bond indices to collect
// perturbation order (as is normal), we use the priorities of the
// atoms at the end of the bonds
INT_LIST ref;
ROMol::OEDGE_ITER beg,end;
boost::tie(beg,end) = atom->getOwningMol().getAtomBonds(atom);
ROMol::GRAPH_MOL_BOND_PMAP::type pMap = atom->getOwningMol().getBondPMap();
while(beg!=end){
const Atom *endAtom=pMap[*beg]->getOtherAtom(atom);
int cipRank=0;
if(endAtom->hasProp("_CIPRank")){
endAtom->getProp("_CIPRank",cipRank);
}
ref.push_back(cipRank);
++beg;
}
BOOST_FOREACH(int &oIdx,trueOrder){
const Atom *endAtom=atom->getOwningMol().getBondWithIdx(oIdx)->getOtherAtom(atom);
int cipRank=0;
if(endAtom->hasProp("_CIPRank")){
endAtom->getProp("_CIPRank",cipRank);
}
oIdx=cipRank;
}
#if 0
BOOST_LOG(rdErrorLog)<<" ****"<<std::endl;
std::copy(ref.begin(),ref.end(),std::ostream_iterator<int>(std::cerr," "));
std::cerr<<std::endl;
std::copy(trueOrder.begin(),trueOrder.end(),std::ostream_iterator<int>(std::cerr," "));
std::cerr<<std::endl;
BOOST_LOG(rdErrorLog)<<" ****"<<std::endl;
#endif
nSwaps=static_cast<int>(countSwapsToInterconvert(ref,trueOrder));
} else {
nSwaps = atom->getPerturbationOrder(trueOrder);
}
#else
if( !atom->hasProp("_CIPCode") && atom->hasProp("_CIPRank") &&
!atom->getOwningMol().hasProp("_ringSteroWarning") ){
BOOST_LOG(rdWarningLog)<<"Warning: ring stereochemistry detected. The output SMILES is not canonical."<<std::endl;
atom->getOwningMol().setProp("_ringStereoWarning",true,true);
}
nSwaps = atom->getPerturbationOrder(trueOrder);
#endif
if(atom->getDegree()==3 && !bondIn){
// This is a special case. Here's an example:
// Our internal representation of a chiral center is equivalent to:
// [C@](F)(O)(C)[H]
// we'll be dumping it without the H, which entails a reordering:
// [C@@H](F)(O)C
++nSwaps;
}
//BOOST_LOG(rdErrorLog)<<">>>> "<<atom->getIdx()<<" "<<nSwaps<<" "<<atom->getChiralTag()<<std::endl;
std::string atStr="";
switch(atom->getChiralTag()){
case Atom::CHI_TETRAHEDRAL_CW:
if(!(nSwaps%2))
atStr = "@@";
else
atStr = "@";
chiralityIncluded=true;
break;
case Atom::CHI_TETRAHEDRAL_CCW:
if(!(nSwaps%2))
atStr = "@";
else
atStr = "@@";
chiralityIncluded=true;
break;
default:
break;
}
res << atStr;
}
if(needsBracket){
unsigned int totNumHs=atom->getTotalNumHs();
if(totNumHs > 0){
res << "H";
if(totNumHs > 1) res << totNumHs;
}
if(fc > 0){
res << "+";
if(fc > 1) res << fc;
} else if(fc < 0) {
res << "-";
if(fc < -1) res << -fc;
}
res << "]";
}
// If the atom has this property, the contained string will
// be inserted directly in the SMILES:
if(atom->hasProp("_supplementalSmilesLabel")){
std::string label;
atom->getProp("_supplementalSmilesLabel",label);
res << label;
}
return res.str();
}
std::string GetBondSmiles(const Bond *bond,int atomToLeftIdx,bool doKekule){
PRECONDITION(bond,"bad bond");
if(atomToLeftIdx<0) atomToLeftIdx=bond->getBeginAtomIdx();
std::stringstream res;
bool aromatic=false;
if( !doKekule &&
(bond->getBondType() == Bond::SINGLE ||
bond->getBondType() == Bond::DOUBLE ||
bond->getBondType() == Bond::AROMATIC) ){
Atom *a1,*a2;
a1 = bond->getOwningMol().getAtomWithIdx(atomToLeftIdx);
a2 = bond->getOwningMol().getAtomWithIdx(bond->getOtherAtomIdx(atomToLeftIdx));
if((a1->getIsAromatic() && a2->getIsAromatic()) &&
(a1->getAtomicNum()||a2->getAtomicNum())) aromatic=true;
}
Bond::BondDir dir= bond->getBondDir();
switch(bond->getBondType()){
case Bond::SINGLE:
if( dir != Bond::NONE && dir != Bond::UNKNOWN ){
switch(dir){
case Bond::ENDDOWNRIGHT:
if(bond->getOwningMol().hasProp("_doIsoSmiles")) res << "\\";
break;
case Bond::ENDUPRIGHT:
if(bond->getOwningMol().hasProp("_doIsoSmiles")) res << "/";
break;
default:
break;
}
} else {
// if the bond is marked as aromatic and the two atoms
// are aromatic, we need no marker (this arises in kekulized
// molecules).
// FIX: we should be able to dump kekulized smiles
// currently this is possible by removing all
// isAromatic flags, but there should maybe be another way
if( aromatic && !bond->getIsAromatic() ) res << "-";
}
break;
case Bond::DOUBLE:
// see note above
if( !aromatic || !bond->getIsAromatic() ) res << "=";
break;
case Bond::TRIPLE: res << "#"; break;
case Bond::AROMATIC:
if ( dir != Bond::NONE && dir != Bond::UNKNOWN ){
switch(dir){
case Bond::ENDDOWNRIGHT:
if(bond->getOwningMol().hasProp("_doIsoSmiles")) res << "\\";
break;
case Bond::ENDUPRIGHT:
if(bond->getOwningMol().hasProp("_doIsoSmiles")) res << "/";
break;
default:
break;
}
}
if(!aromatic) res << ":";
break;
case Bond::DATIVE:
if(atomToLeftIdx>=0 &&
bond->getBeginAtomIdx()==static_cast<unsigned int>(atomToLeftIdx) ) res << ">";
else res << "<";
break;
default:
res << "?";
}
return res.str();
}
std::string FragmentSmilesConstruct(ROMol &mol,int atomIdx,
std::vector<Canon::AtomColors> &colors,
INT_VECT &ranks,bool doKekule){
Canon::MolStack molStack;
// try to prevent excessive reallocation
molStack.reserve(mol.getNumAtoms()+
mol.getNumBonds());
std::stringstream res;
std::map<int,int> ringClosureMap;
int ringIdx,closureVal;
Canon::canonicalizeFragment(mol,atomIdx,colors,ranks,
molStack);
Bond *bond=0;
BOOST_FOREACH(Canon::MolStackElem mSE,molStack){
switch(mSE.type){
case Canon::MOL_STACK_ATOM:
//std::cout<<"\t\tAtom: "<<mSE.obj.atom->getIdx()<<std::endl;
res << GetAtomSmiles(mSE.obj.atom,doKekule,bond);
break;
case Canon::MOL_STACK_BOND:
bond = mSE.obj.bond;
//std::cout<<"\t\tBond: "<<bond->getIdx()<<std::endl;
res << GetBondSmiles(bond,mSE.number,doKekule);
break;
case Canon::MOL_STACK_RING:
ringIdx = mSE.number;
//std::cout<<"\t\tRing: "<<ringIdx;
if(ringClosureMap.count(ringIdx)){
// the index is already in the map ->
// we're closing a ring, so grab
// the index and then delete the value:
closureVal = ringClosureMap[ringIdx];
ringClosureMap.erase(ringIdx);
} else {
// we're opening a new ring, find the index for it:
closureVal = 1;
bool done=false;
// EFF: there's got to be a more efficient way to do this
while(!done){
std::map<int,int>::iterator mapIt;
for(mapIt=ringClosureMap.begin();
mapIt!=ringClosureMap.end();
mapIt++){
if(mapIt->second==closureVal) break;
}
if(mapIt==ringClosureMap.end()){
done=true;
} else {
closureVal+=1;
}
}
ringClosureMap[ringIdx]=closureVal;
}
if(closureVal >= 10){
res << "%";
}
//std::cout << " > " << closureVal <<std::endl;
res << closureVal;
break;
case Canon::MOL_STACK_BRANCH_OPEN:
res << "(";
break;
case Canon::MOL_STACK_BRANCH_CLOSE:
res << ")";
break;
default:
break;
}
}
return res.str();
}
} // end of namespace SmilesWrite
// NOTE: I did not forget the const here... Producing SMILES for
// a molecule actually can change the molecule. Specifically,
// things like the directionality of bonds may be changed when
// the molecule is canonicalized.
// Odds are good that this may be one of those foot-shooting
// decisions and I'm gonna want to smack myself for doing this,
// but we'll try anyway.
std::string MolToSmiles(ROMol &mol,bool doIsomericSmiles,
bool doKekule,int rootedAtAtom){
PRECONDITION(rootedAtAtom<0||static_cast<unsigned int>(rootedAtAtom)<mol.getNumAtoms(),
"rootedAtomAtom must be less than the number of atoms");
if(!mol.getNumAtoms()) return "";
if(doIsomericSmiles){
mol.setProp("_doIsoSmiles",1);
} else if(mol.hasProp("_doIsoSmiles")){
mol.clearProp("_doIsoSmiles");
}
if(mol.hasProp("_ringStereoWarning")){
mol.clearProp("_ringStereoWarning");
}
#if 0
std::cout << "----------------------------" << std::endl;
std::cout << "MolToSmiles:"<< std::endl;
mol.debugMol(std::cout);
std::cout << "----------------------------" << std::endl;
#endif
std::string res;
for(ROMol::AtomIterator atIt=mol.beginAtoms();atIt!=mol.endAtoms();atIt++){
(*atIt)->updatePropertyCache();
}
unsigned int nAtoms=mol.getNumAtoms();
INT_VECT ranks(nAtoms,-1);
// clean up the chirality on any atom that is marked as chiral,
// but that should not be:
if(doIsomericSmiles){
MolOps::assignStereochemistry(mol,true);
}
MolOps::rankAtoms(mol,ranks);
#ifdef VERBOSE_CANON
for(unsigned int tmpI=0;tmpI<ranks.size();tmpI++){
std::cout << tmpI << " " << ranks[tmpI] << " " << *(mol.getAtomWithIdx(tmpI)) << std::endl;
}
#endif
std::vector<Canon::AtomColors> colors(nAtoms,Canon::WHITE_NODE);
std::vector<Canon::AtomColors>::iterator colorIt;
colorIt = colors.begin();
// loop to deal with the possibility that there might be disconnected fragments
while(colorIt != colors.end()){
int nextAtomIdx=-1;
std::string subSmi;
// find the next atom for a traverse
if(rootedAtAtom>=0){
nextAtomIdx=rootedAtAtom;
rootedAtAtom=-1;
} else {
int nextRank = nAtoms+1;
for(unsigned int i=0;i<nAtoms;i++){
if( colors[i] == Canon::WHITE_NODE && ranks[i] < nextRank ){
nextRank = ranks[i];
nextAtomIdx = i;
}
}
}
CHECK_INVARIANT(nextAtomIdx>=0,"no start atom found");
subSmi = SmilesWrite::FragmentSmilesConstruct(mol, nextAtomIdx, colors,
ranks,doKekule);
res += subSmi;
colorIt = std::find(colors.begin(),colors.end(),Canon::WHITE_NODE);
if(colorIt != colors.end()){
res += ".";
}
}
return res;
}
}
Reference in New Issue View Git Blame Copy Permalink