/usr/lib/python2.7/dist-packages/cogent/db/ensembl/assembly.py is in python-cogent 1.9-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from cogent.core.location import Map
from cogent.db.ensembl.species import Species as _Species
from cogent.db.ensembl.util import asserted_one, convert_strand, DisplayString
from cogent.db.ensembl.host import DbConnection
__author__ = "Hua Ying"
__copyright__ = "Copyright 2007-2016, The Cogent Project"
__credits__ = ["Gavin Huttley", "Hua Ying"]
__license__ = "GPL"
__version__ = "1.9"
__maintainer__ = "Hua Ying"
__email__ = "Hua.Ying@anu.edu.au"
__status__ = "alpha"
def location_query(table, query_start, query_end,
start_col = 'seq_region_start', end_col = 'seq_region_end', query = None,
where = 'overlap'):
# TODO should we allow for spans, overlaps, within?
# the union result is a complex query and has be appended to any other queries
# in which it's being employed
# should we be setting default values here regarding the columns that start/end
# are pulled from, or explicitly state which columns
if query is None:
query = sql.select([table])
if where == 'within':
query.append_whereclause(sql.and_(table.c[start_col] < query_start,
table.c[end_col] > query_end))
else:
query.append_whereclause(
sql.or_(sql.and_(table.c[start_col] < query_start,
table.c[end_col] > query_end),
sql.and_(table.c[start_col] >= query_start,
table.c[start_col] <= query_end),
sql.and_(table.c[end_col] >= query_start,
table.c[end_col] <= query_end)))
# the union is only being used here to order the results
# that usage imposes the limitation this function must be appended to
# other queries components being built into a fuller SQL query
# makes me think it shouldn't be here?
query = query.order_by(table.c[start_col])
return query
def _get_coord_type_and_seq_region_id(coord_name, core_db):
seq_region_table = core_db.getTable('seq_region')
rows = sql.select([seq_region_table]).\
where(seq_region_table.c.name == str(coord_name)).execute().fetchall()
species_coord_sys = CoordSystem(species=core_db.db_name.Species,
core_db = core_db)
try:
selected_row = asserted_one(rows)
except ValueError:
selected_row = None
for row in rows:
# not a default_version
if not row['coord_system_id'] in species_coord_sys:
continue
elif not selected_row:
selected_row = row
break
if selected_row is None:
raise ValueError("Ambigous coordinate name: %s" % coord_name)
coord_type = species_coord_sys[selected_row['coord_system_id']].name
return selected_row, coord_type
class Coordinate(object):
def __init__(self, genome, CoordName, Start, End, Strand = 1,
CoordType = None, seq_region_id = None, ensembl_coord=False):
if not CoordType or not (seq_region_id or Start or End):
seq_region_data, CoordType = \
_get_coord_type_and_seq_region_id(CoordName, genome.CoreDb)
seq_region_id = seq_region_data['seq_region_id']
Start = Start or 0
End = End or seq_region_data['length']
# TODO allow creation with just seq_region_id
self.Species = genome.Species
self.CoordType = DisplayString(CoordType, repr_length=4,
with_quotes=False)
self.CoordName = DisplayString(CoordName, repr_length=4,
with_quotes=False)
# if Start == End, we +1 to End, unless these are ensembl_coord's
if ensembl_coord:
Start -= 1
elif Start == End:
End += 1
if Start > End:
assert Strand == -1,\
"strand incorrect for start[%s] > end[%s]" % (Start, End)
Start, End = End, Start
self.Start = Start
self.End = End
self.Strand = convert_strand(Strand)
self.seq_region_id = seq_region_id
self.genome = genome
def __len__(self):
return self.End - self.Start
def __cmp__(self, other):
return cmp((self.CoordName,self.Start), (other.CoordName,other.Start))
def _get_ensembl_start(self):
# ensembl counting starts from 1
return self.Start + 1
EnsemblStart = property(_get_ensembl_start)
def _get_ensembl_end(self):
return self.End
EnsemblEnd = property(_get_ensembl_end)
def __str__(self):
return '%s:%s:%s:%d-%d:%d' % (self.Species, self.CoordType,
self.CoordName, self.Start, self.End, self.Strand)
def __repr__(self):
my_type = self.__class__.__name__
name = _Species.getCommonName(self.Species)
coord_type = self.CoordType
c = '%s(%r,%r,%r,%d-%d,%d)'%(my_type, name, coord_type,
self.CoordName, self.Start, self.End, self.Strand)
return c.replace("'", "")
def adopted(self, other, shift=False):
"""adopts the seq_region_id (including CoordName and CoordType) of
another coordinate.
Arguments:
- shift: an int or True/False. If int, it's added to Start/End.
If bool, other.Start is added to Start/End"""
if type(shift) == bool:
shift = [0, other.Start][shift]
return self.__class__(other.genome, CoordName=other.CoordName,
Start=self.Start+shift, End=self.End+shift,
Strand=other.Strand,
seq_region_id=other.seq_region_id)
def shifted(self, value):
"""adds value to Start/End coords, returning a new instance."""
new = self.copy()
new.Start += value
new.End += value
assert len(new) > 0, 'shift generated a negative length'
return new
def copy(self):
"""returns a copy"""
return self.__class__(genome=self.genome, CoordName=self.CoordName,
Start=self.Start, End=self.End, Strand = self.Strand,
CoordType = self.CoordType, seq_region_id = self.seq_region_id)
def resized(self, from_start, from_end):
"""returns a new resized Coordinate with the
Start=self.Start+from_start and End = self.End+from_end.
If you want to shift Start upstream, add a -ve number"""
new = self.copy()
new.Start += from_start
new.End += from_end
try:
assert len(new) >= 0, 'resized generated a negative length: %s' % new
except (ValueError, AssertionError):
raise ValueError
return new
def makeRelativeTo(self, other, make_relative=True):
"""returns a new coordinate with attributes adopted from other, and
positioned relative to other."""
if other.Strand != self.Strand:
Start = other.End-self.End
elif make_relative:
Start = self.Start-other.Start
else:
Start = self.Start+other.Start
End = Start+len(self)
return self.__class__(other.genome, CoordName=other.CoordName,
Start=Start, End=End, Strand=other.Strand,
seq_region_id=other.seq_region_id)
class _CoordRecord(object):
"""store one record of the coord"""
def __init__(self, attrib, rank, name = None, coord_system_id=None):
self.coord_system_id = coord_system_id
self.name = name
self.rank = rank
self.attr = attrib
def __str__(self):
return "coord_system_id = %d; name = %s; rank = %d; attr = %s "\
% (self.coord_system_id, self.name, self.rank, self.attr)
class CoordSystemCache(object):
"""store coord_system table from core database.
(only read default_version as stated in attrib column)
There are two ways to get information about coordinate system:
(1) use coord_type (e.g contig) which is at coord_system.c.name,
and which are keys of _species_coord_systems[species]
(2) use coord_system_id (e.g 17 refers to chromosome) which are also keys
of _species_coord_systems[species]
(3) to get which level of system is used for storing dna table, check
'attrib' column of coord_system as default_version, sequence_level.
"""
# Problem: multiple species (for compara) --> organized as {species: coordsystem}
# TODO: simplify _species_coord_systems?
# we place each species coord-system in _species_coord_systems, once, so
# this attribute is a very _public_ attribute, and serves as a cache to
# reduce unecessary lookups
_species_coord_systems = {}
columns = ['coord_system_id', 'name', 'rank', 'attrib'] # columns needed from coord_system table
# the attrib property has sequence_level, which means this the coordinate system employed for sequence
def _set_species_system(self, core_db, species):
if species in self._species_coord_systems:
return
self._species_coord_systems[species] = {}
coord_table = core_db.getTable('coord_system')
records = sql.select([coord_table]).where(coord_table.c.attrib.like('default%')).\
execute().fetchall() # only select default version
for record in records:
attr = self._species_coord_systems[species]
for key in ['coord_system_id', 'name']:
key_val = record[key]
vals = {}
for column in self.columns:
val = record[column]
if isinstance(val, set): # join items in set to one string
try:
val = ", ".join(val)
except TypeError:
pass
vals[column] = val
attr[key_val] = _CoordRecord(**vals)
def _get_seq_level_system(self, species):
"""returns the sequence level system for species"""
sp_sys = self._species_coord_systems[species]
for key, val in sp_sys.items():
if 'sequence_level' in val.attr:
return val.name
raise RuntimeError, 'no coord system for %s' % species
def __call__(self, coord_type = None, core_db = None, species = None,
seq_level=False):
"""coord_type can be coord_type or coord_system_id"""
# TODO should only pass in core_db here, not that and Species, or just
# the genome - what if someone wants to compare different ensembl
# releases? keying by species is then a bad idea! better to key by
# id(object)
# change identifier to coord_system, handle either string val or int
# (see MySQL table) as is this shouldn't be a __call__, see line 168
# for reason why we should have a method to set data: setSpeciesCoord
# call then then just returns the coords for the named species
species = _Species.getSpeciesName(species or core_db.db_name.Species)
self._set_species_system(core_db, species)
if seq_level:
result = self._get_seq_level_system(species)
elif coord_type:
result = self._species_coord_systems[species][coord_type]
else:
result = self._species_coord_systems[species]
return result
CoordSystem = CoordSystemCache()
def _rank_checking(query_coord_type, target_coord_type, core_db, species):
# assiting in constructingthe query language for assembly
# in order to convert between coordinate systems, we need to establish the
# ranking for coordinate types
# rank defines the order of conversion between coord system 'levels'
# chromosome has rank 1
# super contig has rank 2
# contig has rank 4
# clone has rank 3
# converting requires changing columns between 'asm' and 'cmp'
# converting from clone -> contig, use 'asm' column
# converting from contig -> clone, use 'cmp' column
query_rank = CoordSystem(core_db = core_db, species = species,
coord_type=query_coord_type).rank
target_rank = CoordSystem(core_db = core_db, species = species,
coord_type=target_coord_type).rank
if query_rank < target_rank:
query_prefix, target_prefix = 'asm', 'cmp'
elif query_rank > target_rank:
query_prefix, target_prefix = 'cmp', 'asm'
else:
query_prefix, target_prefix = '', ''
return query_prefix, target_prefix
def _get_equivalent_coords(query_coord, assembly_row, query_prefix,
target_prefix, target_coord_type):
# TODO better function name
start = query_coord.EnsemblStart
end = query_coord.EnsemblEnd
strand = query_coord.Strand
ori = assembly_row['ori']
q_strand, t_strand = strand, strand * ori
if 'seq_region' not in query_prefix:
q_seq_region_id = assembly_row['%s_seq_region_id' % query_prefix]
t_seq_region_id = assembly_row['%s_seq_region_id' % target_prefix]
else:
q_seq_region_id = assembly_row['_'.join([query_prefix, 'id'])]
t_seq_region_id = assembly_row['_'.join([target_prefix, 'id'])]
# d -- distance
d_start = max(0, start - int(assembly_row['%s_start' % query_prefix]))
d_end = max(0, int(assembly_row['%s_end' % query_prefix]) - end)
# q -- query (to differ from the origin query block)
q_start = int(assembly_row['%s_start'%query_prefix]) + d_start
q_end = int(assembly_row['%s_end'%query_prefix]) - d_end
if int(assembly_row['ori']) == -1:
d_start, d_end = d_end, d_start
# t -- target
t_start = int(assembly_row['%s_start' % target_prefix]) + d_start
t_end = int(assembly_row['%s_end' % target_prefix]) - d_end
q_location = Coordinate(CoordName=query_coord.CoordName, Start=q_start,
End=q_end, Strand=q_strand,
CoordType=query_coord.CoordType,
seq_region_id=q_seq_region_id,
genome = query_coord.genome, ensembl_coord=True)
t_location = Coordinate(CoordName=assembly_row['name'], Start=t_start,
End=t_end, Strand=t_strand, CoordType=target_coord_type,
seq_region_id=t_seq_region_id,
genome = query_coord.genome,
ensembl_coord=True)
return [q_location, t_location]
def assembly_exception_coordinate(loc):
"""returns a coordinate conversion for one with an assembly exception"""
genome = loc.genome
assemb_except_table = genome.CoreDb.getTable('assembly_exception')
seq_region_table = genome.CoreDb.getTable('seq_region')
query = sql.select([assemb_except_table, seq_region_table.c.name],
sql.and_(
assemb_except_table.c.seq_region_id == \
loc.seq_region_id,
assemb_except_table.c.exc_seq_region_id == \
seq_region_table.c.seq_region_id))
query = location_query(assemb_except_table,
loc.Start, loc.End, query = query)
record = asserted_one(query.execute().fetchall())
s, conv_loc = _get_equivalent_coords(loc, record, "seq_region",
"exc_seq_region", loc.CoordType)
return conv_loc
def get_coord_conversion(query_location,target_coord_type,core_db,where=None):
"""returns the ???"""
where = where or 'overlap'
# TODO better function name
species = core_db.db_name.Species
assert query_location.Species == species
assembly = core_db.getTable('assembly')
seq_region = core_db.getTable('seq_region')
target_coord_system_id = CoordSystem(target_coord_type, core_db=core_db,
species=species).coord_system_id
query_prefix, target_prefix = _rank_checking(query_location.CoordType,
target_coord_type, core_db, species)
if query_prefix == target_prefix:
return [[query_location, query_location]]
# TODO: deal with query_prefix == target_prefix == '' --> could happen
# when query features.
query = sql.select([assembly, seq_region.c.name], sql.and_(assembly.c\
['%s_seq_region_id' % target_prefix] == seq_region.c.seq_region_id,
seq_region.c.coord_system_id == target_coord_system_id,
assembly.c['%s_seq_region_id' % query_prefix] ==\
query_location.seq_region_id))
query = location_query(assembly, query_location.EnsemblStart,
query_location.EnsemblEnd,
start_col = "%s_start" % query_prefix,
end_col = "%s_end" % query_prefix, query = query,
where=where)
assembly_rows = query.execute().fetchall()
results = []
for assembly_row in assembly_rows:
results.append(_get_equivalent_coords(query_location, assembly_row,
query_prefix, target_prefix, target_coord_type))
return results
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