def match_pairs(
reads,
out_fhand,
orphan_out_fhand,
out_format,
ordered=True,
check_order_buffer_size=0,
max_reads_memory=None,
temp_dir=None,
):
"""It matches the seq pairs in an iterator and splits the orphan seqs."""
counts = 0
check_order_buffer = KeyedSet()
for pair in _get_paired_and_orphan(reads, ordered, max_reads_memory, temp_dir):
if len(pair) == 1:
write_seqs(pair, orphan_out_fhand, out_format)
try:
name = _parse_pair_direction_and_name(pair[0])[0]
except PairDirectionError:
name = get_name(pair[0])
if ordered and counts < check_order_buffer_size:
counts += 1
if not check_order_buffer.check_add(name):
msg = "Reads are not ordered by pairs.Use unordered option"
raise ItemsNotSortedError(msg)
elif ordered and counts >= check_order_buffer_size:
if name in check_order_buffer:
msg = "Reads are not ordered by pairs.Use unordered option"
raise ItemsNotSortedError(msg)
elif len(pair) == 2:
write_seqs(pair, out_fhand, out_format)
flush_fhand(orphan_out_fhand)
flush_fhand(out_fhand)
def match_pairs(reads,
out_fhand,
orphan_out_fhand,
out_format,
ordered=True,
check_order_buffer_size=0,
max_reads_memory=None,
temp_dir=None):
'''It matches the seq pairs in an iterator and splits the orphan seqs.'''
counts = 0
check_order_buffer = KeyedSet()
for pair in _get_paired_and_orphan(reads, ordered, max_reads_memory,
temp_dir):
if len(pair) == 1:
write_seqs(pair, orphan_out_fhand, out_format)
try:
name = _parse_pair_direction_and_name(pair[0])[0]
except PairDirectionError:
name = get_name(pair[0])
if ordered and counts < check_order_buffer_size:
counts += 1
if not check_order_buffer.check_add(name):
msg = 'Reads are not ordered by pairs.Use unordered option'
raise ItemsNotSortedError(msg)
elif ordered and counts >= check_order_buffer_size:
if name in check_order_buffer:
msg = 'Reads are not ordered by pairs.Use unordered option'
raise ItemsNotSortedError(msg)
elif len(pair) == 2:
write_seqs(pair, out_fhand, out_format)
flush_fhand(orphan_out_fhand)
flush_fhand(out_fhand)
def filter_duplicates(in_fhands, out_fhand, paired_reads,
n_seqs_packet=None, tempdir=None):
if not in_fhands:
raise ValueError('At least one input fhand is required')
pairs = _read_pairs(in_fhands, paired_reads)
sorted_pairs = sorted_items(pairs, key=_get_pair_key, tempdir=tempdir,
max_items_in_memory=n_seqs_packet)
for pair in unique(sorted_pairs, key=_get_pair_key):
write_seqs(pair, out_fhand)
def deinterleave_pairs(seqs, out_fhand1, out_fhand2, out_format):
"""It splits a sequence iterator with alternating paired reads in two.
It will fail if forward and reverse reads are not alternating.
"""
for pair in group_pairs(seqs, n_seqs_in_pair=2):
write_seqs((pair[0],), out_fhand1, out_format)
write_seqs((pair[1],), out_fhand2, out_format)
out_fhand1.flush()
out_fhand2.flush()
def deinterleave_pairs(seqs, out_fhand1, out_fhand2, out_format):
'''It splits a sequence iterator with alternating paired reads in two.
It will fail if forward and reverse reads are not alternating.
'''
for pair in group_pairs(seqs, n_seqs_in_pair=2):
write_seqs((pair[0], ), out_fhand1, out_format)
write_seqs((pair[1], ), out_fhand2, out_format)
out_fhand1.flush()
out_fhand2.flush()
def match_pairs(seqs, out_fhand, orphan_out_fhand, out_format,
memory_limit=get_setting('DEFAULT_SEQS_IN_MEM_LIMIT')):
'It matches the seq pairs in an iterator and splits the orphan seqs'
buf_fwd = {'index': {}, 'items': []}
buf_rev = {'index': {}, 'items': []}
buf1, buf2 = buf_fwd, buf_rev # for the all orphan case
for seq in seqs:
try:
seq_name, direction = _parse_pair_direction_and_name(seq)
except PairDirectionError:
write_seqs([seq], orphan_out_fhand, out_format)
continue
if direction == FWD:
buf1 = buf_rev
buf2 = buf_fwd
else:
buf1 = buf_fwd
buf2 = buf_rev
try:
matching_seq_index = buf1['index'][seq_name]
except KeyError:
matching_seq_index = None
if matching_seq_index is None:
# add to buff
buf2['items'].append(seq)
buf2['index'][seq_name] = len(buf2['items']) - 1
# check mem limit
sum_items = len(buf1['items'] + buf2['items'])
if memory_limit is not None and sum_items >= memory_limit:
error_msg = 'There are too many consecutive non matching seqs'
error_msg += ' in your input. We have reached the memory limit'
raise MaxNumReadsInMem(error_msg)
else:
# write seqs from buffer1
orphan_seqs = buf1['items'][:matching_seq_index]
matching_seq = buf1['items'][matching_seq_index]
write_seqs(orphan_seqs, orphan_out_fhand, out_format)
write_seqs([matching_seq, seq], out_fhand, out_format)
# fix buffers 1
buf1['items'] = buf1['items'][matching_seq_index + 1:]
buf1['index'] = {s: i for i, s in enumerate(buf1['items'])}
# writes seqs from buffer 2 and fix buffer2
write_seqs(buf2['items'], orphan_out_fhand, out_format)
buf2['items'] = []
buf2['index'] = {}
else:
orphan_seqs = buf1['items'] + buf2['items']
write_seqs(orphan_seqs, orphan_out_fhand, out_format)
orphan_out_fhand.flush()
flush_fhand(out_fhand)
def match_pairs_unordered(seq_fpath, out_fhand, orphan_out_fhand, out_format):
'It matches the seq pairs in an iterator and splits the orphan seqs'
index_ = _index_seq_file(seq_fpath)
paired, orphans = _get_paired_and_orphan(index_)
# write paired
write_seqs((SeqWrapper(SEQRECORD, index_[title], None) for title in paired), out_fhand, out_format)
# orphans
write_seqs((SeqWrapper(SEQRECORD, index_[title], None) for title in orphans), orphan_out_fhand,
out_format)
def match_pairs_unordered(seq_fpath, out_fhand, orphan_out_fhand, out_format):
'It matches the seq pairs in an iterator and splits the orphan seqs'
index_ = _index_seq_file(seq_fpath)
paired, orphans = _get_paired_and_orphan(index_)
# write paired
write_seqs((SeqWrapper(SEQRECORD, index_[title], None)
for title in paired), out_fhand, out_format)
# orphans
write_seqs((SeqWrapper(SEQRECORD, index_[title], None)
for title in orphans), orphan_out_fhand, out_format)
def _pre_trim(self, trim_packet):
seqs = [s for seqs in trim_packet[SEQS_PASSED]for s in seqs]
reads_fhand = NamedTemporaryFile(dir=self._tempdir, suffix='.trimming')
write_seqs(seqs, reads_fhand)
reads_fhand.flush()
bwa = map_with_bwamem(self._index_fpath,
interleave_fpath=reads_fhand.name)
bam_fhand = NamedTemporaryFile(dir=self._tempdir)
map_process_to_sortedbam(bwa, bam_fhand.name, key='queryname',
tempdir=self._tempdir)
self._bam_fhand = bam_fhand
reads_fhand.close()
def filter_duplicates(in_fhands, out_fhand, paired_reads, use_length=None,
n_seqs_packet=None, tempdir=None):
if not in_fhands:
raise ValueError('At least one input fhand is required')
pairs = _read_pairs(in_fhands, paired_reads)
get_pair_key = _PairKeyGetter(use_length=use_length)
if n_seqs_packet is None:
unique_pairs = unique_unordered(pairs, key=get_pair_key)
else:
sorted_pairs = sorted_items(pairs, key=get_pair_key, tempdir=tempdir,
max_items_in_memory=n_seqs_packet)
unique_pairs = unique(sorted_pairs, key=get_pair_key)
for pair in unique_pairs:
write_seqs(pair, out_fhand)
def __call__(self, seqs):
'It splits a list of sequences with the provided linkers'
seq_fhand = write_seqs(seqs, file_format='fasta')
seq_fhand.flush()
min_identity = 87.0
min_len = 13
filters = [{'kind': 'min_length', 'min_num_residues': min_len,
'length_in_query': False, 'filter_match_parts': True},
{'kind': 'score_threshold', 'score_key': 'identity',
'min_score': min_identity}]
matcher = BlasterForFewSubjects(seq_fhand.name, self.linkers,
program='blastn', filters=filters,
params={'task': 'blastn-short'},
elongate_for_global=True,
seqs_type=NUCL)
new_seqs = []
for seq in seqs:
segments = matcher.get_matched_segments_for_read(get_name(seq))
if segments is not None:
split_seqs = self._split_by_mate_linker(seq, segments)
else:
split_seqs = [seq]
for seq in split_seqs:
new_seqs.append(seq)
return new_seqs
def __call__(self, seqs):
'It splits a list of sequences with the provided linkers'
seq_fhand = write_seqs(seqs, file_format='fasta')
seq_fhand.flush()
min_identity = 87.0
min_len = 13
filters = [{'kind': 'min_length', 'min_num_residues': min_len,
'length_in_query': False, 'filter_match_parts': True},
{'kind': 'score_threshold', 'score_key': 'identity',
'min_score': min_identity}]
matcher = BlasterForFewSubjects(seq_fhand.name, self.linkers,
program='blastn', filters=filters,
params={'task': 'blastn-short'},
elongate_for_global=True,
seqs_type=NUCL)
new_seqs = []
for seq in seqs:
segments = matcher.get_matched_segments_for_read(get_name(seq))
if segments is not None:
split_seqs = self._split_by_mate_linker(seq, segments)
else:
split_seqs = [seq]
for seq in split_seqs:
new_seqs.append(seq)
return new_seqs
def test_all_orphan():
"All reads end up in orphan"
seqs = [SeqRecord(Seq("ACT"), id="seq1"), SeqRecord(Seq("ACT"), id="seq2")]
seqs = list(assing_kind_to_seqs(SEQRECORD, seqs, None))
out_fhand = StringIO()
orphan_out_fhand = StringIO()
match_pairs(seqs, out_fhand, orphan_out_fhand, out_format="fasta")
assert orphan_out_fhand.getvalue() == ">seq1\nACT\n>seq2\nACT\n"
seq_fhand = NamedTemporaryFile(suffix=".fasta")
write_seqs(seqs, seq_fhand, file_format="fasta")
seq_fhand.flush()
out_fhand = StringIO()
orphan_out_fhand = StringIO()
match_pairs_unordered(seq_fhand.name, out_fhand, orphan_out_fhand, out_format="fasta")
assert ">seq1\nACT\n" in orphan_out_fhand.getvalue()
assert ">seq2\nACT\n" in orphan_out_fhand.getvalue()
def _do_blast_2(db_fpath,
queries,
program,
dbtype=None,
blast_format=None,
params=None,
remote=False):
'''It returns an alignment result with the blast.
It is an alternative interface to the one based on fpaths.
db_fpath should be a plain sequence file.
queries should be a SeqRecord list.
If an alternative blast output format is given it should be tabular, so
blast_format is a list of fields.
'''
query_fhand = write_seqs(queries, file_format='fasta')
query_fhand.flush()
if remote:
blastdb = db_fpath
fmt = 'XML' if blast_format is None else blast_format.upper()
else:
blastdb = get_or_create_blastdb(db_fpath, dbtype=dbtype)
if blast_format is None:
blast_format = [
'query',
'subject',
'query_length',
'subject_length',
'query_start',
'query_end',
'subject_start',
'subject_end',
'expect',
'identity',
]
fmt = generate_tabblast_format(blast_format)
if params is None:
params = {}
params['outfmt'] = fmt
blast_fhand = tempfile.NamedTemporaryFile(suffix='.blast')
do_blast(query_fhand.name,
blastdb,
program,
blast_fhand.name,
params,
remote=remote)
if remote:
blasts = BlastParser(blast_fhand)
else:
blasts = TabularBlastParser(blast_fhand, blast_format)
return blasts, blast_fhand
def test_all_orphan():
'All reads end up in orphan'
seqs = [SeqRecord(Seq('ACT'), id='seq1'),
SeqRecord(Seq('ACT'), id='seq2')]
seqs = list(assing_kind_to_seqs(SEQRECORD, seqs, None))
out_fhand = StringIO()
orphan_out_fhand = StringIO()
match_pairs(seqs, out_fhand, orphan_out_fhand, out_format='fasta')
assert orphan_out_fhand.getvalue() == '>seq1\nACT\n>seq2\nACT\n'
seq_fhand = NamedTemporaryFile(suffix='.fasta')
write_seqs(seqs, seq_fhand, file_format='fasta')
seq_fhand.flush()
out_fhand = StringIO()
orphan_out_fhand = StringIO()
match_pairs_unordered(seq_fhand.name, out_fhand, orphan_out_fhand,
out_format='fasta')
assert '>seq1\nACT\n' in orphan_out_fhand.getvalue()
assert '>seq2\nACT\n' in orphan_out_fhand.getvalue()
def _run_estscan(seqs, pep_out_fpath, dna_out_fpath, matrix_fpath):
'It runs estscan in the input seqs'
seq_fhand = write_seqs(seqs, file_format='fasta')
seq_fhand.flush()
binary = get_binary_path('estscan')
cmd = [binary, '-t', pep_out_fpath, '-o', dna_out_fpath, '-M',
matrix_fpath, seq_fhand.name]
process = popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
check_process_finishes(process, binary=cmd[0])
seq_fhand.close()
def filter_duplicates(in_fhands,
out_fhand,
paired_reads,
use_length=None,
n_seqs_packet=None,
tempdir=None):
if not in_fhands:
raise ValueError('At least one input fhand is required')
pairs = _read_pairs(in_fhands, paired_reads)
get_pair_key = _PairKeyGetter(use_length=use_length)
if n_seqs_packet is None:
unique_pairs = unique_unordered(pairs, key=get_pair_key)
else:
sorted_pairs = sorted_items(pairs,
key=get_pair_key,
tempdir=tempdir,
max_items_in_memory=n_seqs_packet)
unique_pairs = unique(sorted_pairs, key=get_pair_key)
for pair in unique_pairs:
write_seqs(pair, out_fhand)
def _run_estscan(seqs, pep_out_fpath, dna_out_fpath, matrix_fpath):
'It runs estscan in the input seqs'
seq_fhand = write_seqs(seqs, file_format='fasta')
seq_fhand.flush()
binary = get_binary_path('estscan')
cmd = [binary, '-t', pep_out_fpath, '-o', dna_out_fpath, '-M',
matrix_fpath, seq_fhand.name]
process = popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
check_process_finishes(process, binary=cmd[0])
seq_fhand.close()
def _pre_trim(self, trim_packet):
seqs = [s for seqs in trim_packet[SEQS_PASSED] for s in seqs]
db_fhand = write_seqs(seqs, file_format="fasta")
db_fhand.flush()
params = {"task": "blastn-short", "expect": "0.0001"}
filters = [
{"kind": "score_threshold", "score_key": "identity", "min_score": 87},
{"kind": "min_length", "min_num_residues": 13, "length_in_query": False},
]
self._matcher = BlasterForFewSubjects(
db_fhand.name, self.oligos, program="blastn", filters=filters, params=params, elongate_for_global=True
)
def test_seqitems_io(self):
'It checks the different seq class streams IO'
fhand = StringIO('>s1\nACTG\n>s2 desc\nACTG\n')
seqs = list(read_seqs([fhand], prefered_seq_classes=[SEQITEM]))
assert seqs[0].kind == SEQITEM
fhand = StringIO()
write_seqs(seqs, fhand)
assert fhand.getvalue() == '>s1\nACTG\n>s2 desc\nACTG\n'
assert seqs[0].object.name == 's1'
# SeqRecord
fhand = StringIO('>s1\nACTG\n>s2 desc\nACTG\n')
seqs = list(read_seqs([fhand], prefered_seq_classes=[SEQRECORD]))
assert seqs[0].kind == SEQRECORD
fhand = StringIO()
write_seqs(seqs, fhand, 'fasta')
assert fhand.getvalue() == '>s1\nACTG\n>s2 desc\nACTG\n'
# seqitem not possible with different input and output formats
fhand = StringIO('>s1\nACTG\n>s2 desc\nACTG\n')
try:
seqs = list(read_seqs([fhand], out_format='fastq',
prefered_seq_classes=[SEQITEM]))
self.fail('ValueError expected')
except ValueError:
pass
fhand = StringIO('>s1\nACTG\n>s2 desc\nACTG\n')
seqs = list(read_seqs([fhand], out_format='fasta',
prefered_seq_classes=[SEQITEM]))
fhand = StringIO()
write_seqs(seqs, fhand)
assert fhand.getvalue() == '>s1\nACTG\n>s2 desc\nACTG\n'
def _setup_checks(self, filterpacket):
index_fpath = self._index_fpath
get_or_create_bowtie2_index(index_fpath)
seqs = [s for seqs in filterpacket[SEQS_PASSED] for s in seqs]
seq_class = seqs[0].kind
extra_params = []
# Which format do we need for the bowtie2 input read file fasta or
# fastq?
if seq_class == SEQRECORD:
if 'phred_quality' in seqs[0].object.letter_annotations.viewkeys():
file_format = 'fastq'
else:
extra_params.append('-f')
file_format = 'fasta'
elif seq_class == SEQITEM:
file_format = get_file_format(seqs[0])
if 'illumina' in file_format:
extra_params.append('--phred64')
elif 'fasta' in file_format:
extra_params.append('-f')
elif 'fastq' in file_format:
pass
else:
msg = 'For FilterBowtie2Match and SeqItems fastq or fasta '
msg += 'files are required'
raise RuntimeError(msg)
else:
raise NotImplementedError()
reads_fhand = NamedTemporaryFile(suffix=file_format)
write_seqs(seqs, reads_fhand, file_format=file_format)
reads_fhand.flush()
bam_fhand = NamedTemporaryFile(suffix='.bam')
map_with_bowtie2(index_fpath,
bam_fhand.name,
unpaired_fpaths=[reads_fhand.name],
extra_params=extra_params)
self.mapped_reads = _get_mapped_reads(bam_fhand.name, self.min_mapq)
def classify_chimeras(in_fhand,
index_fpath,
mate_distance,
out_fhand,
chimeras_fhand=None,
unknown_fhand=None,
tempdir=None,
threads=None,
settings=get_setting('CHIMERAS_SETTINGS')):
'''It maps sequences from input files, sorts them and writes to output
files according to its classification'''
bam_fhand = NamedTemporaryFile(suffix='.bam')
extra_params = ['-a', '-M']
bwa = map_with_bwamem(index_fpath,
interleave_fpath=in_fhand.name,
extra_params=extra_params)
map_process_to_sortedbam(bwa,
bam_fhand.name,
key='queryname',
tempdir=tempdir)
for pair, kind in classify_mapped_reads(bam_fhand,
settings=settings,
mate_distance=mate_distance):
if kind is NON_CHIMERIC:
write_seqs(pair, out_fhand)
elif kind is CHIMERA and chimeras_fhand is not None:
write_seqs(pair, chimeras_fhand)
elif kind is UNKNOWN and unknown_fhand is not None:
write_seqs(pair, unknown_fhand)
def _setup_checks(self, filterpacket):
index_fpath = self._index_fpath
get_or_create_bowtie2_index(index_fpath)
seqs = [s for seqs in filterpacket[SEQS_PASSED]for s in seqs]
seq_class = seqs[0].kind
extra_params = []
# Which format do we need for the bowtie2 input read file fasta or
# fastq?
if seq_class == SEQRECORD:
if 'phred_quality' in seqs[0].object.letter_annotations.viewkeys():
file_format = 'fastq'
else:
extra_params.append('-f')
file_format = 'fasta'
elif seq_class == SEQITEM:
file_format = get_file_format(seqs[0])
if 'illumina' in file_format:
extra_params.append('--phred64')
elif 'fasta' in file_format:
extra_params.append('-f')
elif 'fastq' in file_format:
pass
else:
msg = 'For FilterBowtie2Match and SeqItems fastq or fasta '
msg += 'files are required'
raise RuntimeError(msg)
else:
raise NotImplementedError()
reads_fhand = NamedTemporaryFile(suffix=file_format)
write_seqs(seqs, reads_fhand, file_format=file_format)
reads_fhand.flush()
bam_fhand = NamedTemporaryFile(suffix='.bam')
map_process = map_with_bowtie2(index_fpath,
unpaired_fpaths=[reads_fhand.name],
extra_params=extra_params)
map_process_to_bam(map_process, bam_fhand.name)
self.mapped_reads = _get_mapped_reads(bam_fhand.name, self.min_mapq)
def _pre_trim(self, trim_packet):
seqs = [s for seqs in trim_packet[SEQS_PASSED]for s in seqs]
db_fhand = write_seqs(seqs, file_format='fasta')
db_fhand.flush()
params = {'task': 'blastn-short', 'expect': '0.0001'}
filters = [{'kind': 'score_threshold', 'score_key': 'identity',
'min_score': 87},
{'kind': 'min_length', 'min_num_residues': 13,
'length_in_query': False}]
self._matcher = BlasterForFewSubjects(db_fhand.name, self.oligos,
program='blastn', filters=filters,
params=params,
elongate_for_global=True)
def _pre_trim(self, trim_packet):
seqs = [s for seqs in trim_packet[SEQS_PASSED]for s in seqs]
db_fhand = write_seqs(seqs, file_format='fasta')
db_fhand.flush()
params = {'task': 'blastn-short', 'expect': '0.0001'}
filters = [{'kind': 'score_threshold', 'score_key': 'identity',
'min_score': 87},
{'kind': 'min_length', 'min_num_residues': 13,
'length_in_query': False}]
self._matcher = BlasterForFewSubjects(db_fhand.name, self.oligos,
program='blastn', filters=filters,
params=params,
elongate_for_global=True)
def test_all_orphan():
'All reads end up in orphan'
seqs = [
SeqRecord(Seq('ACT'), id='seq1'),
SeqRecord(Seq('ACT'), id='seq2')
]
seqs = list(assing_kind_to_seqs(SEQRECORD, seqs, None))
out_fhand = StringIO()
orphan_out_fhand = StringIO()
match_pairs(seqs, out_fhand, orphan_out_fhand, out_format='fasta')
assert orphan_out_fhand.getvalue() == '>seq1\nACT\n>seq2\nACT\n'
seq_fhand = NamedTemporaryFile(suffix='.fasta')
write_seqs(seqs, seq_fhand, file_format='fasta')
seq_fhand.flush()
out_fhand = StringIO()
orphan_out_fhand = StringIO()
match_pairs_unordered(seq_fhand.name,
out_fhand,
orphan_out_fhand,
out_format='fasta')
assert '>seq1\nACT\n' in orphan_out_fhand.getvalue()
assert '>seq2\nACT\n' in orphan_out_fhand.getvalue()
def deinterleave_pairs(seqs, out_fhand1, out_fhand2, out_format):
'''It splits a sequence iterator with alternating paired reads in two.
It will fail if forward and reverse reads are not alternating.
'''
while True:
try:
seq1 = seqs.next()
except StopIteration:
seq1 = None
try:
seq2 = seqs.next()
except StopIteration:
seq2 = None
if seq1 is None:
break # we have consumed the input iterator completely
if seq2 is None:
msg = 'The file had an odd number of sequences'
raise InterleaveError(msg)
_check_name_and_direction_match(seq1, seq2)
write_seqs([seq1], out_fhand1, out_format)
write_seqs([seq2], out_fhand2, out_format)
out_fhand1.flush()
out_fhand2.flush()
def deinterleave_pairs(seqs, out_fhand1, out_fhand2, out_format):
'''It splits a sequence iterator with alternating paired reads in two.
It will fail if forward and reverse reads are not alternating.
'''
while True:
try:
seq1 = seqs.next()
except StopIteration:
seq1 = None
try:
seq2 = seqs.next()
except StopIteration:
seq2 = None
if seq1 is None:
break # we have consumed the input iterator completely
if seq2 is None:
msg = 'The file had an odd number of sequences'
raise InterleaveError(msg)
_check_name_and_direction_match(seq1, seq2)
write_seqs([seq1], out_fhand1, out_format)
write_seqs([seq2], out_fhand2, out_format)
out_fhand1.flush()
out_fhand2.flush()
def _setup_checks(self, filterpacket):
seqs = [s for seqs in filterpacket[SEQS_PASSED]for s in seqs]
# we create a blastdb for these reads and then we use the oligos
# as the blast query
db_fhand = write_seqs(seqs, file_format='fasta')
db_fhand.flush()
params = {'task': 'blastn-short', 'expect': '0.0001'}
filters = [{'kind': 'score_threshold', 'score_key': 'identity',
'min_score': 87},
{'kind': 'min_length', 'min_num_residues': 13,
'length_in_query': False}]
self._matcher = BlasterForFewSubjects(db_fhand.name, self.oligos,
program='blastn', filters=filters,
params=params,
elongate_for_global=False)
def _setup_checks(self, filterpacket):
seqs = [s for seqs in filterpacket[SEQS_PASSED]for s in seqs]
# we create a blastdb for these reads and then we use the oligos
# as the blast query
db_fhand = write_seqs(seqs, file_format='fasta')
db_fhand.flush()
params = {'task': 'blastn-short', 'expect': '0.0001'}
filters = [{'kind': 'score_threshold', 'score_key': 'identity',
'min_score': 87},
{'kind': 'min_length', 'min_num_residues': 13,
'length_in_query': False}]
self._matcher = BlasterForFewSubjects(db_fhand.name, self.oligos,
program='blastn', filters=filters,
params=params,
elongate_for_global=False)
def _do_blast_2(db_fpath, queries, program, dbtype=None, blast_format=None, params=None, remote=False):
"""It returns an alignment result with the blast.
It is an alternative interface to the one based on fpaths.
db_fpath should be a plain sequence file.
queries should be a SeqRecord list.
If an alternative blast output format is given it should be tabular, so
blast_format is a list of fields.
"""
query_fhand = write_seqs(queries, file_format="fasta")
query_fhand.flush()
if remote:
blastdb = db_fpath
fmt = "XML" if blast_format is None else blast_format.upper()
else:
blastdb = get_or_create_blastdb(db_fpath, dbtype=dbtype)
if blast_format is None:
blast_format = [
"query",
"subject",
"query_length",
"subject_length",
"query_start",
"query_end",
"subject_start",
"subject_end",
"expect",
"identity",
]
fmt = generate_tabblast_format(blast_format)
if params is None:
params = {}
params["outfmt"] = fmt
blast_fhand = tempfile.NamedTemporaryFile(suffix=".blast")
do_blast(query_fhand.name, blastdb, program, blast_fhand.name, params, remote=remote)
if remote:
blasts = BlastParser(blast_fhand)
else:
blasts = TabularBlastParser(blast_fhand, blast_format)
return blasts, blast_fhand
def __call__(self, seqs):
'It trims the masked segments of the SeqWrappers.'
db_fhand = write_seqs(seqs, file_format='fasta')
db_fhand.flush()
params = {'task': 'blastn-short', 'expect': '0.0001'}
filters = [{'kind': 'score_threshold', 'score_key': 'identity',
'min_score': 89},
{'kind': 'min_length', 'min_num_residues': 13,
'length_in_query': False}]
matcher = BlasterForFewSubjects(db_fhand.name, self.oligos,
program='blastn', filters=filters,
params=params,
elongate_for_global=True)
for seq in seqs:
segments = matcher.get_matched_segments_for_read(get_name(seq))
if segments is not None:
_add_trim_segments(segments[0], seq, kind=VECTOR)
return seqs
def test_seqitems_io(self):
'It checks the different seq class streams IO'
fhand = StringIO('>s1\nACTG\n>s2 desc\nACTG\n')
seqs = list(read_seqs([fhand], 'fasta',
prefered_seq_classes=[SEQITEM]))
assert seqs[0].kind == SEQITEM
fhand = StringIO()
write_seqs(seqs, fhand)
assert fhand.getvalue() == '>s1\nACTG\n>s2 desc\nACTG\n'
assert seqs[0].object.name == 's1'
# SeqRecord
fhand = StringIO('>s1\nACTG\n>s2 desc\nACTG\n')
seqs = list(
read_seqs([fhand], 'fasta', prefered_seq_classes=[SEQRECORD]))
assert seqs[0].kind == SEQRECORD
fhand = StringIO()
write_seqs(seqs, fhand, 'fasta')
assert fhand.getvalue() == '>s1\nACTG\n>s2 desc\nACTG\n'
# seqitem not possible with different input and output formats
fhand = StringIO('>s1\nACTG\n>s2 desc\nACTG\n')
try:
seqs = list(
read_seqs([fhand],
'fasta',
out_format='fastq',
prefered_seq_classes=[SEQITEM]))
self.fail('ValueError expected')
except ValueError:
pass
fhand = StringIO('>s1\nACTG\n>s2 desc\nACTG\n')
seqs = list(
read_seqs([fhand],
'fasta',
out_format='fasta',
prefered_seq_classes=[SEQITEM]))
fhand = StringIO()
write_seqs(seqs, fhand)
assert fhand.getvalue() == '>s1\nACTG\n>s2 desc\nACTG\n'
def classify_chimeras(in_fhand, index_fpath, mate_distance, out_fhand,
chimeras_fhand=None, unknown_fhand=None, tempdir=None,
threads=None, settings=get_setting('CHIMERAS_SETTINGS')):
'''It maps sequences from input files, sorts them and writes to output
files according to its classification'''
bam_fhand = NamedTemporaryFile(suffix='.bam')
extra_params = ['-a', '-M']
bwa = map_with_bwamem(index_fpath, interleave_fpath=in_fhand.name,
extra_params=extra_params)
map_process_to_sortedbam(bwa, bam_fhand.name, key='queryname',
tempdir=tempdir)
for pair, kind in classify_mapped_reads(bam_fhand, settings=settings,
mate_distance=mate_distance):
if kind is NON_CHIMERIC:
write_seqs(pair, out_fhand)
elif kind is CHIMERA and chimeras_fhand is not None:
write_seqs(pair, chimeras_fhand)
elif kind is UNKNOWN and unknown_fhand is not None:
write_seqs(pair, unknown_fhand)
def filter_chimeras(ref_fpath, out_fhand, chimeras_fhand, in_fhands,
unknown_fhand, unpaired=False, paired_result=True,
settings=get_setting('CHIMERAS_SETTINGS'),
min_seed_len=None, directory=None):
file_format = get_format(in_fhands[0])
if unpaired:
unpaired_fpaths = [fhand.name for fhand in in_fhands]
paired_fpaths = None
else:
f_fhand = NamedTemporaryFile()
r_fhand = NamedTemporaryFile()
seqs = read_seqs(in_fhands)
deinterleave_pairs(seqs, f_fhand, r_fhand, file_format)
paired_fpaths = [f_fhand.name, r_fhand.name]
unpaired_fpaths = None
bamfile = _sorted_mapped_reads(ref_fpath, paired_fpaths, unpaired_fpaths,
directory, file_format, min_seed_len)
total = 0
chimeric = 0
unknown = 0
for pair, kind in classify_mapped_reads(bamfile, settings=settings,
paired_result=paired_result,
file_format=file_format):
if kind is NON_CHIMERIC:
write_seqs(pair, out_fhand)
elif kind is CHIMERA and chimeras_fhand is not None:
write_seqs(pair, chimeras_fhand)
chimeric += 1
elif kind is UNKNOWN and unknown_fhand is not None:
write_seqs(pair, unknown_fhand)
unknown += 1
total += 1
mapped = total - chimeric - unknown
print 'Total pairs analyzed: ', total
print 'Chimeric pairs filtered: ', chimeric, '\t', chimeric / float(total)
print 'Unknown pairs found: ', unknown, '\t', unknown / float(total)
print 'Non-chimeric pairs: ', mapped, '\t', mapped / float(total)
def match_pairs(seqs,
out_fhand,
orphan_out_fhand,
out_format,
memory_limit=get_setting('DEFAULT_SEQS_IN_MEM_LIMIT')):
'It matches the seq pairs in an iterator and splits the orphan seqs'
buf_fwd = {'index': {}, 'items': []}
buf_rev = {'index': {}, 'items': []}
buf1, buf2 = buf_rev, buf_fwd # for the all orphan case
for seq in seqs:
try:
seq_name, direction = _parse_pair_direction_and_name(seq)
except PairDirectionError:
write_seqs([seq], orphan_out_fhand, out_format)
continue
# buf1 -> buffer for the reads with the same orientation as the
# current one
# buf2 -> buffer for the reads with the reverse orientation as the
# current one
if direction == FWD:
buf1 = buf_fwd
buf2 = buf_rev
else:
buf1 = buf_rev
buf2 = buf_fwd
try:
matching_seq_index = buf2['index'][seq_name]
except KeyError:
matching_seq_index = None
if matching_seq_index is None:
# add to buff
buf1['items'].append(seq)
buf1['index'][seq_name] = len(buf1['items']) - 1
# check mem limit
sum_items = len(buf2['items'] + buf1['items'])
if memory_limit is not None and sum_items >= memory_limit:
error_msg = 'There are too many consecutive non matching seqs'
error_msg += ' in your input. We have reached the memory limit.'
error_msg += 'Are you sure that the reads are sorted and '
error_msg += 'interleaved?. You could try with the unordered'
error_msg += ' algorith'
raise MaxNumReadsInMem(error_msg)
else:
# write seqs from buffer1
orphan_seqs = buf2['items'][:matching_seq_index]
matching_seq = buf2['items'][matching_seq_index]
write_seqs(orphan_seqs, orphan_out_fhand, out_format)
write_seqs([matching_seq, seq], out_fhand, out_format)
# fix buffer 1
if matching_seq_index != len(buf2['items']) - 1:
msg = 'The given files are not sorted (ordered) and '
msg = 'interleaved. You could try with the unordered algorithm'
raise MalformedFile(msg)
buf2 = {'index': {}, 'items': []}
# writes seqs from buffer 2 and fix buffer2
write_seqs(buf1['items'], orphan_out_fhand, out_format)
buf1['items'] = []
buf1['index'] = {}
else:
orphan_seqs = buf1['items'] + buf2['items']
write_seqs(orphan_seqs, orphan_out_fhand, out_format)
orphan_out_fhand.flush()
flush_fhand(out_fhand)
def match_pairs(seqs, out_fhand, orphan_out_fhand, out_format,
memory_limit=get_setting('DEFAULT_SEQS_IN_MEM_LIMIT')):
'It matches the seq pairs in an iterator and splits the orphan seqs'
buf_fwd = {'index': {}, 'items': []}
buf_rev = {'index': {}, 'items': []}
buf1, buf2 = buf_rev, buf_fwd # for the all orphan case
for seq in seqs:
try:
seq_name, direction = _parse_pair_direction_and_name(seq)
except PairDirectionError:
write_seqs([seq], orphan_out_fhand, out_format)
continue
# buf1 -> buffer for the reads with the same orientation as the
# current one
# buf2 -> buffer for the reads with the reverse orientation as the
# current one
if direction == FWD:
buf1 = buf_fwd
buf2 = buf_rev
else:
buf1 = buf_rev
buf2 = buf_fwd
try:
matching_seq_index = buf2['index'][seq_name]
except KeyError:
matching_seq_index = None
if matching_seq_index is None:
# add to buff
buf1['items'].append(seq)
buf1['index'][seq_name] = len(buf1['items']) - 1
# check mem limit
sum_items = len(buf2['items'] + buf1['items'])
if memory_limit is not None and sum_items >= memory_limit:
error_msg = 'There are too many consecutive non matching seqs'
error_msg += ' in your input. We have reached the memory limit.'
error_msg += 'Are you sure that the reads are sorted and '
error_msg += 'interleaved?. You could try with the unordered'
error_msg += ' algorith'
raise MaxNumReadsInMem(error_msg)
else:
# write seqs from buffer1
orphan_seqs = buf2['items'][:matching_seq_index]
matching_seq = buf2['items'][matching_seq_index]
write_seqs(orphan_seqs, orphan_out_fhand, out_format)
write_seqs([matching_seq, seq], out_fhand, out_format)
# fix buffer 1
if matching_seq_index != len(buf2['items']) - 1:
msg = 'The given files are not sorted (ordered) and '
msg = 'interleaved. You could try with the unordered algorithm'
raise MalformedFile(msg)
buf2 = {'index': {}, 'items': []}
# writes seqs from buffer 2 and fix buffer2
write_seqs(buf1['items'], orphan_out_fhand, out_format)
buf1 = {'index': {}, 'items': []}
if direction == FWD:
buf_fwd = buf1
buf_rev = buf2
else:
buf_rev = buf1
buf_fwd = buf2
else:
orphan_seqs = buf1['items'] + buf2['items']
write_seqs(orphan_seqs, orphan_out_fhand, out_format)
orphan_out_fhand.flush()
flush_fhand(out_fhand)