__init__.py

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#------------------------------------------------------------------------------
# This file is part of the OpenStructure project <www.openstructure.org>
#
# Copyright (C) 2008-2011 by the OpenStructure authors
#
# This library is free software; you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 3.0 of the License, or (at your option)
# any later version.
# This library 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
#------------------------------------------------------------------------------
import os, tempfile, ftplib, httplib

from _ost_io import *
from ost import mol, geom, conop, seq

profiles=None

class IOProfiles:
  def __init__(self):
     self._dict={}

  def __getitem__(self, key):
    return IOProfileRegistry.Instance().Get(key)

  def __setitem__(self, key, value):
    if isinstance(value, str):
      value=self[value].Copy()
    IOProfileRegistry.Instance().Set(key, value)
    self._dict[key]=value

  def __len__(self):
    return len(self._dict)

  def __iter__(self):
    return self._dict.__iter__()

if not profiles:
  profiles=IOProfiles()
  if conop.GetDefaultLib():
    processor = conop.RuleBasedProcessor(conop.GetDefaultLib())
  else:
    processor = conop.HeuristicProcessor()
  profiles['STRICT']=IOProfile(dialect='PDB', fault_tolerant=False,
                               quack_mode=False, processor=processor.Copy())
  profiles['SLOPPY']=IOProfile(dialect='PDB', fault_tolerant=True,
                               quack_mode=True, processor=processor.Copy())
  profiles['CHARMM']=IOProfile(dialect='CHARMM', fault_tolerant=True,
                               quack_mode=False, processor=processor.Copy())
  profiles['DEFAULT']='STRICT'

def _override(val1, val2):
  if val2!=None:
    return val2
  else:
    return val1

def LoadPDB(filename, restrict_chains="", no_hetatms=None,
            fault_tolerant=None, load_multi=False, quack_mode=None,
            join_spread_atom_records=None, calpha_only=None,
            profile='DEFAULT', remote=False, dialect=None,
            seqres=False, bond_feasibility_check=None):
  """
  Load PDB file from disk and return one or more entities. Several options 
  allow to customize the exact behaviour of the PDB import. For more information 
  on these options, see :doc:`profile`.
  
  Residues are flagged as ligand if they are mentioned in a HET record.

  :param restrict_chains: If not an empty string, only chains listed in the
     string will be imported.

  :param fault_tolerant: Enable/disable fault-tolerant import. If set, overrides 
     the value of :attr:`IOProfile.fault_tolerant`.

  :param no_hetatms: If set to True, HETATM records will be ignored. Overrides 
      the value of :attr:`IOProfile.no_hetatms`

  :param load_multi: If set to True, a list of entities will be returned instead
      of only the first. This is useful when dealing with multi-PDB files.

  :param join_spread_atom_records: If set, overrides the value of 
      :attr:`IOProfile.join_spread_atom_records`.
  
  :param remote: If set to True, the method tries to load the pdb from the 
     remote pdb repository www.pdb.org. The filename is then interpreted as the 
     pdb id.
     
  :rtype: :class:`~ost.mol.EntityHandle` or a list thereof if `load_multi` is 
      True.

  :param dialect: Specifies the particular dialect to use. If set, overrides 
    the value of :attr:`IOProfile.dialect`

  :param seqres: Whether to read SEQRES records. If set to True, the loaded 
    entity and seqres entry will be returned as a tuple.

  :type dialect: :class:`str`
  

  :raises: :exc:`~ost.io.IOException` if the import fails due to an erroneous or 
      inexistent file
  """
  def _override(val1, val2):
    if val2!=None:
      return val2
    else:
      return val1
  if isinstance(profile, str):
    prof=profiles[profile].Copy()
  elif isinstance(profile, IOProfile):
    prof=profile.Copy()
  else:
    raise TypeError('profile must be of type string or IOProfile, '+\
                    'instead of %s'%type(profile))
  if dialect not in (None, 'PDB', 'CHARMM',):
    raise ValueError('dialect must be PDB or CHARMM')
  prof.calpha_only=_override(prof.calpha_only, calpha_only)
  prof.no_hetatms=_override(prof.no_hetatms, no_hetatms)
  prof.dialect=_override(prof.dialect, dialect)
  prof.quack_mode=_override(prof.quack_mode, quack_mode)
  if prof.processor:
    prof.processor.check_bond_feasibility=_override(prof.processor.check_bond_feasibility, 
                                                    bond_feasibility_check)
  prof.fault_tolerant=_override(prof.fault_tolerant, fault_tolerant)
  prof.join_spread_atom_records=_override(prof.join_spread_atom_records,
                                          join_spread_atom_records)

  tmp_file = None # avoid getting out of scope
  if remote:
    from ost.io.remote import RemoteGet
    tmp_file =RemoteGet(filename)
    filename = tmp_file.name
  
  conop_inst=conop.Conopology.Instance()
  if prof.processor:
    if prof.dialect=='PDB':
      prof.processor.dialect=conop.PDB_DIALECT
    elif prof.dialect=='CHARMM':
      prof.processor.dialect=conop.CHARMM_DIALECT
  reader=PDBReader(filename, prof)
  reader.read_seqres=seqres
  try:
    if load_multi:
      ent_list=[]
      while reader.HasNext():
        ent=mol.CreateEntity()
        reader.Import(ent, restrict_chains)
        if prof.processor:
          prof.processor.Process(ent)
        ent_list.append(ent)
      if len(ent_list)==0:
        raise IOError("File '%s' doesn't contain any entities" % filename)
      return ent_list
    else:
      ent=mol.CreateEntity()
      if reader.HasNext():
        reader.Import(ent, restrict_chains)
        if prof.processor:
          prof.processor.Process(ent)
      else:
        raise IOError("File '%s' doesn't contain any entities" % filename)
      if seqres:
        return ent, reader.seqres
      return ent
  except:
    raise

def SavePDB(models, filename, dialect=None,  pqr=False, profile='DEFAULT'):
  """
  Save entity or list of entities to disk. If a list of entities is supplied
  the PDB file will be saved as a multi PDB file. Each of the entities is
  wrapped into a MODEL/ENDMDL pair.

  If the atom number exceeds 99999, '*****' is used.

  :param models: The entity or list of entities (handles or views) to be saved
  :param filename: The filename
  :type  filename: string
  """
  if not getattr(models, '__len__', None):
    models=[models]
  if isinstance(profile, str):
    profile=profiles[profile].Copy()
  elif isinstance(profile, IOProfile):
    profile.Copy()
  else:
    raise TypeError('profile must be of type string or IOProfile, '+\
                    'instead of %s'%type(profile))
  profile.dialect=_override(profile.dialect, dialect)
  writer=PDBWriter(filename, profile)
  writer.SetIsPQR(pqr)
  if len(models)>1:
    writer.write_multi_model=True
  for model in models:
    writer.Write(model)

try:
  from ost import img
  LoadMap = LoadImage
  SaveMap = SaveImage
except ImportError:
  pass

 ## loads several images and puts them in an ImageList
 # \sa \ref fft_li.py "View Fourier Transform Example"
def LoadImageList (files):
  image_list=img.ImageList()
  for file in files:
    image=LoadImage(file)
    image_list.append(image)
  return image_list

LoadMapList=LoadImageList

def LoadCHARMMTraj(crd, dcd_file=None, profile='CHARMM',
                   lazy_load=False, stride=1, 
                   dialect=None, detect_swap=True,swap_bytes=False):
  """
  Load CHARMM trajectory file.
  
  :param crd: EntityHandle or filename of the (PDB) file containing the
      structure. The structure must have the same number of atoms as the 
      trajectory
  :param dcd_file: The filename of the DCD file. If not set, and crd is a 
      string, the filename is set to the <crd>.dcd
  :param layz_load: Whether the trajectory should be loaded on demand. Instead 
      of loading the complete trajectory into memory, the trajectory frames are 
      loaded from disk when requested.
  :param stride: The spacing of the frames to load. When set to 2, for example, 
      every second frame is loaded from the trajectory. By default, every frame 
      is loaded.
  :param dialect: The dialect for the PDB file to use. See :func:`LoadPDB`. If 
      set, overrides the value of the profile
  :param profile: The IO profile to use for loading the PDB file. See 
      :doc:`profile`.
  :param detect_swap: if True (the default), then automatic detection of endianess
      is attempted, otherwise the swap_bytes parameter is used
  :param swap_bytes: is detect_swap is False, this flag determines whether bytes
      are swapped upon loading or not
  """
  if not isinstance(crd, mol.EntityHandle):
    if dcd_file==None:
      dcd_file='%s.dcd' % os.path.splitext(crd)[0]    
    crd=LoadPDB(crd, profile=profile, dialect=dialect)

  else:
    if not dcd_file:
      raise ValueError("No DCD filename given")
  return LoadCHARMMTraj_(crd, dcd_file, stride, lazy_load, detect_swap, swap_bytes)

def LoadMMCIF(filename, restrict_chains="", fault_tolerant=None, calpha_only=None, profile='DEFAULT', remote=False, seqres=False, info=False):
  """
  Load MMCIF file from disk and return one or more entities. Several options 
  allow to customize the exact behaviour of the MMCIF import. For more
  information on these options, see :doc:`profile`.
  
  Residues are flagged as ligand if they are mentioned in a HET record.

  :param restrict_chains: If not an empty string, only chains listed in the
     string will be imported.

  :param fault_tolerant: Enable/disable fault-tolerant import. If set, overrides
     the value of :attr:`IOProfile.fault_tolerant`.

  :param remote: If set to True, the method tries to load the pdb from the 
     remote pdb repository www.pdb.org. The filename is then interpreted as the 
     pdb id.

  :rtype: :class:`~ost.mol.EntityHandle`.

  :param seqres: Whether to read SEQRES records. If set to True, the loaded 
    entity and seqres entry will be returned as second item.

  :param info: Whether to return an info container with the other output.
               Returns a :class:`MMCifInfo` object as last item.

  :raises: :exc:`~ost.io.IOException` if the import fails due to an erroneous
           or non-existent file.
  """
  def _override(val1, val2):
    if val2!=None:
      return val2
    else:
      return val1
  if isinstance(profile, str):
    prof = profiles[profile].Copy()
  else:
    prof = profile.Copy()

  prof.calpha_only=_override(prof.calpha_only, calpha_only)
  prof.fault_tolerant=_override(prof.fault_tolerant, fault_tolerant)

  if remote:
    from ost.io.remote import RemoteGet
    tmp_file =RemoteGet(filename, from_repo='cif')
    filename = tmp_file.name
  
  try:
    ent = mol.CreateEntity()
    reader = MMCifReader(filename, ent, prof)
    reader.read_seqres = seqres
    #if reader.HasNext():
    reader.Parse()
    if prof.processor:
      prof.processor.Process(ent)
    #else:
    #  raise IOError("File doesn't contain any entities")
    if seqres and info:
      return ent, reader.seqres, reader.info
    if seqres:
      return ent, reader.seqres
    if info:
      return ent, reader.info
    return ent
  except:
    raise

# this function uses a dirty trick: should be a member of MMCifInfoBioUnit
# which is totally C++, but we want the method in Python... so we define it
# here (__init__) and add it as a member to the class. With this, the first
# arguement is the usual 'self'.
# documentation for this function was moved to mmcif.rst,
# MMCifInfoBioUnit.PDBize, since this function is not included in SPHINX.
def _PDBize(biounit, asu, seqres=None, min_polymer_size=10,
            transformation=False):
  pdbizer = mol.alg.PDBize(min_polymer_size=min_polymer_size)

  chains = biounit.GetChainList()
  c_intvls = biounit.GetChainIntervalList()
  o_intvls = biounit.GetOperationsIntervalList()
  ss = seqres
  if not ss:
    ss = seq.CreateSequenceList()
  # create list of operations
  # for cartesian products, operations are stored in a list, multiplied with
  # the next list of operations and re-stored... until all lists of operations
  # are multiplied in an all-against-all manner.
  operations = biounit.GetOperations()
  for i in range(0,len(c_intvls)):
    trans_matrices = geom.Mat4List()
    l_operations = operations[o_intvls[i][0]:o_intvls[i][1]]
    if len(l_operations) > 0:
      for op in l_operations[0]:
        rot = geom.Mat4()
        rot.PasteRotation(op.rotation)
        trans = geom.Mat4()
        trans.PasteTranslation(op.translation)
        tr = geom.Mat4()
        tr = trans * rot
        trans_matrices.append(tr)
      for op_n in range(1, len(l_operations)):
        tmp_ops = geom.Mat4List()
        for o in l_operations[op_n]:
          rot = geom.Mat4()
          rot.PasteRotation(o.rotation)
          trans = geom.Mat4()
          trans.PasteTranslation(o.translation)
          tr = geom.Mat4()
          tr = trans * rot
          for t_o in trans_matrices:
            tp = t_o * tr
            tmp_ops.append(tp)
        trans_matrices = tmp_ops
    # select chains into a view as basis for each transformation
    assu = asu.Select('cname='+','.join(chains[c_intvls[i][0]:c_intvls[i][1]]))
    pdbizer.Add(assu, trans_matrices, ss)
  pdb_bu = pdbizer.Finish(transformation)
  if transformation:
    return pdb_bu, pdb_bu.GetTransformationMatrix()
  return pdb_bu

MMCifInfoBioUnit.PDBize = _PDBize