def fasta_transform(fasta_file, chain_file, locations, output_file, bgzip=False, reverse=False):
"""
:param fasta_file:
:param chain_file:
:param locations:
:param output_file:
:param bgzip:
:param reverse:
:return:
"""
start = time.time()
if not isinstance(fasta_file, FastaFile):
fasta_file = g2g_fu.check_file(fasta_file)
if not isinstance(chain_file, ChainIter):
chain_file = g2g_fu.check_file(chain_file)
output_file = g2g_fu.check_file(output_file, 'w')
g2g_fu.delete_file(output_file)
g2g_fu.delete_index_files(output_file)
LOG.info("FASTA FILE: {0}".format(fasta_file))
LOG.info("CHAIN FILE: {0}".format(chain_file))
LOG.info("OUTPUT FILE: {0}".format(output_file))
LOG.info("BGZIP: {0}".format(bgzip))
LOG.info("REVERSE: {0}".format(reverse))
if isinstance(fasta_file, FastaFile):
fasta = fasta_file
else:
fasta = FastaFile(fasta_file)
if not isinstance(chain_file, ChainIter):
chain_file = ChainIter(chain_file, reverse=reverse)
seq_ids = []
if locations:
LOG.debug("Have locations")
new_locations = []
for l in locations:
if isinstance(l, Location):
new_locations.append(l)
else:
new_locations.append(parse_location(l))
seq_ids.append(new_locations[-1].seqid)
locations = new_locations
else:
LOG.debug("Calculating locations")
locations = [parse_location("{0}:1-{1}".format(a, fasta.get_reference_length(a)), 1) for a in fasta.references]
seq_ids = [a for a in fasta.references]
temp_output_file = output_file
if bgzip:
if g2g_fu.get_extension(output_file) != 'gz':
output_file = "{0}.gz".format(output_file)
else:
temp_output_file = temp_output_file[:-3]
fasta_out = open(temp_output_file, "w")
LOG.info("Transforming...")
chr_info = {}
try:
# will need a better way, but for now...
LOG.info("Parsing chain file...")
for line in chain_file:
if len(line) > 7:
LOG.debug("Adding chromosome {0}".format(chain_file.current_chain_header[1]))
chr_info[chain_file.current_chain_header[1]] = {'from_size': line[2], 'from_start': line[4], 'from_end': line[5],
'to_size': line[7], 'to_start': line[9], 'to_end': line[10],
'header_chain':chain_file.current_chain_header, 'lines': []}
else:
chr_info[chain_file.current_chain_header[1]]['lines'].append(line)
LOG.info("Chain file parsed")
insertion_bases = 0
deletion_bases = 0
for location in locations:
LOG.info("Processing chromosome={0}".format(location.seqid))
LOG.debug("Location: {0}".format(location))
chrom_size_from = chr_info[location.seqid]['from_size']
chrom_size_to = chr_info[location.seqid]['to_size']
last_pos = chr_info[location.seqid]['from_start']
new_sequence = StringIO()
chain_file.reset()
for chain_line in chr_info[location.seqid]['lines']:
LOG.debug("\nLINE: {0} : {1}".format(chain_file.line_no, chain_line))
if len(chain_line) == 1:
# last line
fragment = chain_line[0]
partial_seq = fasta.fetch(location.seqid, last_pos, last_pos + fragment)
new_sequence.write(str(partial_seq))
if len(new_sequence.getvalue()) < chrom_size_to:
LOG.warn("Length's do not match, chromosome length in chain: {0}, sequence length: {1}".format(chrom_size_to, len(new_sequence.getvalue())))
fasta_out.write(">{0} {1}:{2}-{3}\n".format(location.seqid, location.seqid, chr_info[location.seqid]['from_start'] + 1, chrom_size_to))
for l in wrap_sequence(new_sequence.getvalue()):
fasta_out.write(l.strip())
fasta_out.write('\n')
break
else:
# fragment_size dt_size dq_size same_bases dt_bases dq_bases
fragment = chain_line[0]
dt = chain_line[1 if not reverse else 2]
dq = chain_line[2 if not reverse else 1]
same = chain_line[3]
dt_bases = chain_line[4 if not reverse else 5]
dq_bases = chain_line[5 if not reverse else 4]
partial_seq = fasta.fetch(location.seqid, last_pos, last_pos + fragment)
new_sequence.write(partial_seq)
if dq > 0:
# insertion
LOG.debug("INSERTION")
new_sequence.write(dq_bases)
LOG.debug("{0}:{1}-{2} (Length: {3})".format(location.seqid, last_pos, last_pos + fragment, len(partial_seq)))
if len(partial_seq) > 100:
LOG.debug("{0}...{1}".format(partial_seq[:10], partial_seq[-10:]))
else:
LOG.debug(partial_seq)
LOG.debug("Adding {0}".format(dq_bases))
LOG.debug("SAME={0}, {1}".format(same, partial_seq[-(len(same)):]))
insertion_bases += dq
if dt > 0:
# deletion
LOG.debug("DELETION")
last_pos += dt
LOG.debug("skipping ahead {0} bases".format(dt))
deletion_bases += dt
last_pos += fragment
LOG.debug("LAST_POS={0}, INSERTIONS={1}, DELETIONS={2}, DIFF={3}".format(last_pos, insertion_bases, deletion_bases, (insertion_bases - deletion_bases)))
# bgzip and index
if bgzip:
LOG.info("Compressing and indexing...")
g2g_fu.bgzip_index(temp_output_file, output_file, 'fa')
except G2GLocationError, le:
LOG.debug("Unable to parse location, {0}".format(le.message))
raise le
def fasta_patch(
filename_fasta,
filename_vcf,
strain,
filename_output,
bgzip=False,
num_processes=None,
pass_only=False,
quality=False,
diploid=False,
):
"""
Patch a Fasta file by replacing the bases where the SNPs are located in the VCF file.
:param filename_fasta: name of the input Fasta file
:type filename_fasta: string
:param filename_vcf: name of the VCF file
:type filename_vcf: string
:param strain: name of strain to use in VCF file
:type strain: string
:param filename_output: name of the output Fasta file
:type filename_output: string
:param bgzip: compress file in BGZIP format
:type bgzip: boolean
:param num_processes: the number of processes to spawn
:type num_processes: int
:param pass_only: Only process those VCF records with a 'PASS'
:type pass_only: boolean
:param quality: filter on quality, FI=PASS
:type quality: boolean
:param diploid: don't ignore hets and create 2 files
:type diploid: boolean
:return: Nothing
"""
start = time.time()
filename_fasta = g2g_fu.check_file(filename_fasta)
filename_vcf = g2g_fu.check_file(filename_vcf)
LOG.info("INPUT FASTA FILE: {0}".format(filename_fasta))
LOG.info("VCF FILE: {0}".format(filename_vcf))
LOG.info("STRAIN: {0}".format(strain))
LOG.info("PASS FILTER ON: {0}".format(str(pass_only)))
LOG.info("QUALITY FILTER ON: {0}".format(str(quality)))
LOG.info("DIPLOID: {0}".format(str(diploid)))
if not strain:
raise G2GValueError("No strain was specified.")
filename_output_l, filename_output_r = prepare_fasta_patch(filename_fasta, filename_output, bgzip, diploid)
if not num_processes:
num_processes = multiprocessing.cpu_count()
else:
if num_processes <= 0:
num_processes = 1
LOG.info("NUMBER OF PROCESSES: {0}".format(num_processes))
if bgzip:
if diploid:
LOG.info("OUTPUT FASTA FILES: {0}.gz".format(filename_output_l))
LOG.info(" {0}.gz".format(filename_output_r))
else:
LOG.info("OUTPUT FASTA FILE: {0}.gz".format(filename_output_l))
else:
if diploid:
LOG.info("OUTPUT FASTA FILES: {0}".format(filename_output_l))
LOG.info(" {0}".format(filename_output_r))
else:
LOG.info("OUTPUT FASTA FILE: {0}".format(filename_output_l))
LOG.info("Patching...")
try:
patch(
filename_fasta,
filename_vcf,
strain,
filename_output_l,
filename_output_r,
num_processes,
pass_only,
quality,
diploid,
)
LOG.info("Patching complete")
# remove the fai
LOG.debug("removing the FAI index for {0}".format(g2g_fu.delete_index_files(filename_output_l)))
g2g_fu.delete_index_files(filename_output_l)
# move temp to final destination
if bgzip:
LOG.info("Compressing and indexing...")
g2g_fu.bgzip_index(filename_output_l, "{0}.gz".format(filename_output_l), "fa")
if diploid:
g2g_fu.bgzip_index(filename_output_r, "{0}.gz".format(filename_output_r), "fa")
LOG.info("Execution complete: {0}".format(format_time(start, time.time())))
except Exception, e:
LOG.debug(e)
raise G2GError("")
def prepare_fasta_patch(filename_fasta, filename_output, bgzip=False, diploid=False):
"""
Initialize fasta_patch variables
:param filename_fasta:
:param filename_vcf:
:param strain:
:param filename_output:
:param bgzip:
:param diploid:
:return:
"""
filename_output = g2g_fu.check_file(filename_output, "w")
output_file_dir = os.path.abspath(os.path.dirname(filename_output))
new_filename_output = filename_output
# let's figure out what our output names will be
if filename_output.lower().endswith(".gz"):
# strip off .gz
new_filename_output = filename_output[:-3]
if not filename_output.lower().endswith(".fa"):
raise G2GValueError("Expecting output filename extension to be either '.fa.gz' or '.fa'")
if diploid:
filename_output_l = g2g_fu.prepend_before_extension(new_filename_output, "l")
filename_output_r = g2g_fu.prepend_before_extension(new_filename_output, "r")
g2g_fu.delete_index_files(filename_output_l)
g2g_fu.delete_index_files(filename_output_r)
else:
filename_output_l = new_filename_output
filename_output_r = None
g2g_fu.delete_index_files(filename_output_l)
# at this point we are hoping for a .fa extension
# let's figure out our input and process accordingly
if filename_fasta.lower().endswith(".fa.gz"):
# decompress the fasta file if it is compressed
LOG.info("Copying and decompressing fasta file")
# copy file and preserve gz extension for bgzip -d to work
tmp_file_name = os.path.basename(filename_fasta) # something.gz
LOG.debug("tmp_file_name={0}".format(tmp_file_name))
tmp_fasta = os.path.join(output_file_dir, tmp_file_name) # /path/something.fa.gz
LOG.debug("tmp_fasta={0}".format(tmp_fasta))
LOG.debug("COPYING {0} to {1}".format(filename_fasta, tmp_fasta))
shutil.copy(filename_fasta, tmp_fasta) # cp /original/something.fa.gz /output/something.fa.gz
LOG.debug("DECOMPRESSING {0}".format(tmp_fasta))
g2g_fu.bgzip_decompress(tmp_fasta)
tmp_fasta = tmp_fasta[:-3] # /path/something.fa
LOG.debug("tmp_fasta={0}".format(tmp_fasta))
LOG.debug("Moving '{0}' to '{1}'...".format(tmp_fasta, filename_output_l))
shutil.move(tmp_fasta, filename_output_l)
elif filename_fasta.lower().endswith(".fa"):
LOG.debug("File is not compressed")
LOG.debug("COPYING {0} to {1}".format(filename_fasta, filename_output_l))
shutil.copy(filename_fasta, filename_output_l)
else:
raise G2GValueError("Expecting input filename extension to be either '.fa.gz' or '.fa'")
if diploid:
LOG.debug("Copying '{0}' to '{1}'...".format(filename_output_l, filename_output_r))
shutil.copy(filename_output_l, filename_output_r)
# build a temporary fasta index
pysam.FastaFile(filename_output_l)
return filename_output_l, filename_output_r
def fasta_transform(fasta_file,
chain_file,
locations,
output_file,
bgzip=False,
reverse=False):
"""
:param fasta_file:
:param chain_file:
:param locations:
:param output_file:
:param bgzip:
:param reverse:
:return:
"""
start = time.time()
if not isinstance(fasta_file, FastaFile):
fasta_file = g2g_fu.check_file(fasta_file)
if not isinstance(chain_file, ChainIter):
chain_file = g2g_fu.check_file(chain_file)
output_file = g2g_fu.check_file(output_file, 'w')
g2g_fu.delete_file(output_file)
g2g_fu.delete_index_files(output_file)
LOG.info("FASTA FILE: {0}".format(fasta_file))
LOG.info("CHAIN FILE: {0}".format(chain_file))
LOG.info("OUTPUT FILE: {0}".format(output_file))
LOG.info("BGZIP: {0}".format(bgzip))
LOG.info("REVERSE: {0}".format(reverse))
if isinstance(fasta_file, FastaFile):
fasta = fasta_file
else:
fasta = FastaFile(fasta_file)
if not isinstance(chain_file, ChainIter):
chain_file = ChainIter(chain_file, reverse=reverse)
seq_ids = []
if locations:
LOG.debug("Have locations")
new_locations = []
for l in locations:
if isinstance(l, Location):
new_locations.append(l)
else:
new_locations.append(parse_location(l))
seq_ids.append(new_locations[-1].seqid)
locations = new_locations
else:
LOG.debug("Calculating locations")
locations = [
parse_location(
"{0}:1-{1}".format(a, fasta.get_reference_length(a)), 1)
for a in fasta.references
]
seq_ids = [a for a in fasta.references]
temp_output_file = output_file
if bgzip:
if g2g_fu.get_extension(output_file) != 'gz':
output_file = "{0}.gz".format(output_file)
else:
temp_output_file = temp_output_file[:-3]
fasta_out = open(temp_output_file, "w")
LOG.info("Transforming...")
chr_info = {}
try:
# will need a better way, but for now...
LOG.info("Parsing chain file...")
for line in chain_file:
if len(line) > 7:
LOG.debug("Adding chromosome {0}".format(
chain_file.current_chain_header[1]))
chr_info[chain_file.current_chain_header[1]] = {
'from_size': line[2],
'from_start': line[4],
'from_end': line[5],
'to_size': line[7],
'to_start': line[9],
'to_end': line[10],
'header_chain': chain_file.current_chain_header,
'lines': []
}
else:
chr_info[chain_file.current_chain_header[1]]['lines'].append(
line)
LOG.info("Chain file parsed")
insertion_bases = 0
deletion_bases = 0
for location in locations:
LOG.info("Processing chromosome={0}".format(location.seqid))
LOG.debug("Location: {0}".format(location))
chrom_size_from = chr_info[location.seqid]['from_size']
chrom_size_to = chr_info[location.seqid]['to_size']
last_pos = chr_info[location.seqid]['from_start']
new_sequence = StringIO()
chain_file.reset()
for chain_line in chr_info[location.seqid]['lines']:
LOG.debug("\nLINE: {0} : {1}".format(chain_file.line_no,
chain_line))
if len(chain_line) == 1:
# last line
fragment = chain_line[0]
partial_seq = fasta.fetch(location.seqid, last_pos,
last_pos + fragment)
new_sequence.write(str(partial_seq))
if len(new_sequence.getvalue()) < chrom_size_to:
LOG.warn(
"Length's do not match, chromosome length in chain: {0}, sequence length: {1}"
.format(chrom_size_to,
len(new_sequence.getvalue())))
fasta_out.write(">{0} {1}:{2}-{3}\n".format(
location.seqid, location.seqid,
chr_info[location.seqid]['from_start'] + 1,
chrom_size_to))
for l in wrap_sequence(new_sequence.getvalue()):
fasta_out.write(l.strip())
fasta_out.write('\n')
break
else:
# fragment_size dt_size dq_size same_bases dt_bases dq_bases
fragment = chain_line[0]
dt = chain_line[1 if not reverse else 2]
dq = chain_line[2 if not reverse else 1]
same = chain_line[3]
dt_bases = chain_line[4 if not reverse else 5]
dq_bases = chain_line[5 if not reverse else 4]
partial_seq = fasta.fetch(location.seqid, last_pos,
last_pos + fragment)
new_sequence.write(partial_seq)
if dq > 0:
# insertion
LOG.debug("INSERTION")
new_sequence.write(dq_bases)
LOG.debug("{0}:{1}-{2} (Length: {3})".format(
location.seqid, last_pos, last_pos + fragment,
len(partial_seq)))
if len(partial_seq) > 100:
LOG.debug("{0}...{1}".format(
partial_seq[:10], partial_seq[-10:]))
else:
LOG.debug(partial_seq)
LOG.debug("Adding {0}".format(dq_bases))
LOG.debug("SAME={0}, {1}".format(
same, partial_seq[-(len(same)):]))
insertion_bases += dq
if dt > 0:
# deletion
LOG.debug("DELETION")
last_pos += dt
LOG.debug("skipping ahead {0} bases".format(dt))
deletion_bases += dt
last_pos += fragment
LOG.debug(
"LAST_POS={0}, INSERTIONS={1}, DELETIONS={2}, DIFF={3}"
.format(last_pos, insertion_bases, deletion_bases,
(insertion_bases - deletion_bases)))
# bgzip and index
if bgzip:
LOG.info("Compressing and indexing...")
g2g_fu.bgzip_index(temp_output_file, output_file, 'fa')
except G2GLocationError, le:
LOG.debug("Unable to parse location, {0}".format(le.message))
raise le
def fasta_patch(filename_fasta, filename_vcf, strain, filename_output, bgzip=False,
num_processes=None, pass_only=False, quality=False, diploid=False):
"""
Patch a Fasta file by replacing the bases where the SNPs are located in the VCF file.
:param filename_fasta: name of the input Fasta file
:type filename_fasta: string
:param filename_vcf: name of the VCF file
:type filename_vcf: string
:param strain: name of strain to use in VCF file
:type strain: string
:param filename_output: name of the output Fasta file
:type filename_output: string
:param bgzip: compress file in BGZIP format
:type bgzip: boolean
:param num_processes: the number of processes to spawn
:type num_processes: int
:param pass_only: Only process those VCF records with a 'PASS'
:type pass_only: boolean
:param quality: filter on quality, FI=PASS
:type quality: boolean
:param diploid: don't ignore hets and create 2 files
:type diploid: boolean
:return: Nothing
"""
start = time.time()
filename_fasta = g2g_fu.check_file(filename_fasta)
filename_vcf = g2g_fu.check_file(filename_vcf)
LOG.info("INPUT FASTA FILE: {0}".format(filename_fasta))
LOG.info("VCF FILE: {0}".format(filename_vcf))
LOG.info("STRAIN: {0}".format(strain))
LOG.info("PASS FILTER ON: {0}".format(str(pass_only)))
LOG.info("QUALITY FILTER ON: {0}".format(str(quality)))
LOG.info("DIPLOID: {0}".format(str(diploid)))
if not strain:
raise G2GValueError("No strain was specified.")
filename_output_l, filename_output_r = prepare_fasta_patch(filename_fasta, filename_output, bgzip, diploid)
if not num_processes:
num_processes = multiprocessing.cpu_count()
else:
if num_processes <= 0:
num_processes = 1
LOG.info("NUMBER OF PROCESSES: {0}".format(num_processes))
if bgzip:
if diploid:
LOG.info("OUTPUT FASTA FILES: {0}.gz".format(filename_output_l))
LOG.info(" {0}.gz".format(filename_output_r))
else:
LOG.info("OUTPUT FASTA FILE: {0}.gz".format(filename_output_l))
else:
if diploid:
LOG.info("OUTPUT FASTA FILES: {0}".format(filename_output_l))
LOG.info(" {0}".format(filename_output_r))
else:
LOG.info("OUTPUT FASTA FILE: {0}".format(filename_output_l))
LOG.info("Patching...")
try:
patch(filename_fasta, filename_vcf, strain, filename_output_l, filename_output_r,
num_processes, pass_only, quality, diploid)
LOG.info("Patching complete")
# remove the fai
LOG.debug("removing the FAI index for {0}".format(g2g_fu.delete_index_files(filename_output_l)))
g2g_fu.delete_index_files(filename_output_l)
# move temp to final destination
if bgzip:
LOG.info("Compressing and indexing...")
g2g_fu.bgzip_index(filename_output_l, "{0}.gz".format(filename_output_l), 'fa')
if diploid:
g2g_fu.bgzip_index(filename_output_r, "{0}.gz".format(filename_output_r), 'fa')
LOG.info("Execution complete: {0}".format(format_time(start, time.time())))
except Exception, e:
LOG.debug(e)
raise G2GError("")
def prepare_fasta_patch(filename_fasta, filename_output, bgzip=False, diploid=False):
"""
Initialize fasta_patch variables
:param filename_fasta:
:param filename_vcf:
:param strain:
:param filename_output:
:param bgzip:
:param diploid:
:return:
"""
filename_output = g2g_fu.check_file(filename_output, 'w')
output_file_dir = os.path.abspath(os.path.dirname(filename_output))
new_filename_output = filename_output
# let's figure out what our output names will be
if filename_output.lower().endswith('.gz'):
# strip off .gz
new_filename_output = filename_output[:-3]
if not filename_output.lower().endswith('.fa'):
raise G2GValueError("Expecting output filename extension to be either '.fa.gz' or '.fa'")
if diploid:
filename_output_l = g2g_fu.prepend_before_extension(new_filename_output, 'l')
filename_output_r = g2g_fu.prepend_before_extension(new_filename_output, 'r')
g2g_fu.delete_index_files(filename_output_l)
g2g_fu.delete_index_files(filename_output_r)
else:
filename_output_l = new_filename_output
filename_output_r = None
g2g_fu.delete_index_files(filename_output_l)
# at this point we are hoping for a .fa extension
# let's figure out our input and process accordingly
if filename_fasta.lower().endswith('.fa.gz'):
# decompress the fasta file if it is compressed
LOG.info("Copying and decompressing fasta file")
# copy file and preserve gz extension for bgzip -d to work
tmp_file_name = os.path.basename(filename_fasta) # something.gz
LOG.debug("tmp_file_name={0}".format(tmp_file_name))
tmp_fasta = os.path.join(output_file_dir, tmp_file_name) # /path/something.fa.gz
LOG.debug("tmp_fasta={0}".format(tmp_fasta))
LOG.debug("COPYING {0} to {1}".format(filename_fasta, tmp_fasta))
shutil.copy(filename_fasta, tmp_fasta) # cp /original/something.fa.gz /output/something.fa.gz
LOG.debug("DECOMPRESSING {0}".format(tmp_fasta))
g2g_fu.bgzip_decompress(tmp_fasta)
tmp_fasta = tmp_fasta[:-3] # /path/something.fa
LOG.debug("tmp_fasta={0}".format(tmp_fasta))
LOG.debug("Moving '{0}' to '{1}'...".format(tmp_fasta, filename_output_l))
shutil.move(tmp_fasta, filename_output_l)
elif filename_fasta.lower().endswith('.fa'):
LOG.debug("File is not compressed")
LOG.debug("COPYING {0} to {1}".format(filename_fasta, filename_output_l))
shutil.copy(filename_fasta, filename_output_l)
else:
raise G2GValueError("Expecting input filename extension to be either '.fa.gz' or '.fa'")
if diploid:
LOG.debug("Copying '{0}' to '{1}'...".format(filename_output_l, filename_output_r))
shutil.copy(filename_output_l, filename_output_r)
# build a temporary fasta index
pysam.FastaFile(filename_output_l)
return filename_output_l, filename_output_r
