def get_lines(feature):
if isinstance(feature, gff_util.GFFFeature):
return feature.lines()
else:
return [feature.rstrip('\r\n')]
skipped_lines = 0
first_invalid_line = 0
invalid_lines = []
fout = open(output_filename, "w")
warnings = []
warning = ''
twobitfile = None
file_iterator = open(input_filename)
if gff_format and interpret_features:
file_iterator = gff_util.GFFReaderWrapper(file_iterator,
fix_strand=False)
line_count = 1
for feature in file_iterator:
# Ignore comments, headers.
if isinstance(feature, (Header, Comment)):
line_count += 1
continue
name = ""
if gff_format and interpret_features:
# Processing features.
gff_util.convert_gff_coords_to_bed(feature)
chrom = feature.chrom
start = feature.start
end = feature.end
strand = feature.strand
def __main__():
#
# Parse options, args.
#
options, args = doc_optparse.parse(__doc__)
try:
if len(options.cols.split(',')) == 5:
# BED file
chrom_col, start_col, end_col, strand_col, name_col = parse_cols_arg(
options.cols)
else:
# gff file
chrom_col, start_col, end_col, strand_col = parse_cols_arg(
options.cols)
name_col = False
dbkey = options.dbkey
output_format = options.output_format
gff_format = options.gff
interpret_features = options.interpret_features
GALAXY_DATA_INDEX_DIR = options.GALAXY_DATA_INDEX_DIR
fasta_file = options.fasta
input_filename, output_filename = args
except:
doc_optparse.exception()
includes_strand_col = strand_col >= 0
strand = None
nibs = {}
#
# Set path to sequence data.
#
if fasta_file:
# Need to create 2bit file from fasta file.
try:
seq_path = tempfile.NamedTemporaryFile(dir=".").name
cmd = "faToTwoBit %s %s" % (fasta_file, seq_path)
tmp_name = tempfile.NamedTemporaryFile(dir=".").name
tmp_stderr = open(tmp_name, 'wb')
proc = subprocess.Popen(args=cmd,
shell=True,
stderr=tmp_stderr.fileno())
returncode = proc.wait()
tmp_stderr.close()
# Get stderr, allowing for case where it's very large.
tmp_stderr = open(tmp_name, 'rb')
stderr = ''
buffsize = 1048576
try:
while True:
stderr += tmp_stderr.read(buffsize)
if not stderr or len(stderr) % buffsize != 0:
break
except OverflowError:
pass
tmp_stderr.close()
# Error checking.
if returncode != 0:
raise Exception(stderr)
except Exception as e:
stop_err('Error running faToTwoBit. ' + str(e))
else:
seq_path = check_seq_file(dbkey, GALAXY_DATA_INDEX_DIR)
if not os.path.exists(seq_path):
# If this occurs, we need to fix the metadata validator.
stop_err(
"No sequences are available for '%s', request them by reporting this error."
% dbkey)
#
# Fetch sequences.
#
# Get feature's line(s).
def get_lines(feature):
if isinstance(feature, gff_util.GFFFeature):
return feature.lines()
else:
return [feature.rstrip('\r\n')]
skipped_lines = 0
first_invalid_line = 0
invalid_lines = []
fout = open(output_filename, "w")
warnings = []
warning = ''
twobitfile = None
file_iterator = open(input_filename)
if gff_format and interpret_features:
file_iterator = gff_util.GFFReaderWrapper(file_iterator,
fix_strand=False)
line_count = 1
for feature in file_iterator:
# Ignore comments, headers.
if isinstance(feature, (Header, Comment)):
line_count += 1
continue
name = ""
if gff_format and interpret_features:
# Processing features.
gff_util.convert_gff_coords_to_bed(feature)
chrom = feature.chrom
start = feature.start
end = feature.end
strand = feature.strand
else:
# Processing lines, either interval or GFF format.
line = feature.rstrip('\r\n')
if line and not line.startswith("#"):
fields = line.split('\t')
try:
chrom = fields[chrom_col]
start = int(fields[start_col])
end = int(fields[end_col])
if name_col:
name = fields[name_col]
if gff_format:
start, end = gff_util.convert_gff_coords_to_bed(
[start, end])
if includes_strand_col:
strand = fields[strand_col]
except:
warning = "Invalid chrom, start or end column values. "
warnings.append(warning)
if not invalid_lines:
invalid_lines = get_lines(feature)
first_invalid_line = line_count
skipped_lines += len(invalid_lines)
continue
if start > end:
warning = "Invalid interval, start '%d' > end '%d'. " % (
start, end)
warnings.append(warning)
if not invalid_lines:
invalid_lines = get_lines(feature)
first_invalid_line = line_count
skipped_lines += len(invalid_lines)
continue
if strand not in ['+', '-']:
strand = '+'
sequence = ''
else:
continue
# Open sequence file and get sequence for feature/interval.
if seq_path and os.path.exists("%s/%s.nib" % (seq_path, chrom)):
# TODO: improve support for GFF-nib interaction.
if chrom in nibs:
nib = nibs[chrom]
else:
nibs[chrom] = nib = bx.seq.nib.NibFile(
open("%s/%s.nib" % (seq_path, chrom)))
try:
sequence = nib.get(start, end - start)
except Exception as e:
warning = "Unable to fetch the sequence from '%d' to '%d' for build '%s'. " % (
start, end - start, dbkey)
warnings.append(warning)
if not invalid_lines:
invalid_lines = get_lines(feature)
first_invalid_line = line_count
skipped_lines += len(invalid_lines)
continue
elif seq_path and os.path.isfile(seq_path):
if not (twobitfile):
twobitfile = bx.seq.twobit.TwoBitFile(open(seq_path))
try:
if options.gff and interpret_features:
# Create sequence from intervals within a feature.
sequence = ''
for interval in feature.intervals:
sequence += twobitfile[
interval.chrom][interval.start:interval.end]
else:
sequence = twobitfile[chrom][start:end]
except:
warning = "Unable to fetch the sequence from '%d' to '%d' for chrom '%s'. " % (
start, end - start, chrom)
warnings.append(warning)
if not invalid_lines:
invalid_lines = get_lines(feature)
first_invalid_line = line_count
skipped_lines += len(invalid_lines)
continue
else:
warning = "Chromosome by name '%s' was not found for build '%s'. " % (
chrom, dbkey)
warnings.append(warning)
if not invalid_lines:
invalid_lines = get_lines(feature)
first_invalid_line = line_count
skipped_lines += len(invalid_lines)
continue
if sequence == '':
warning = "Chrom: '%s', start: '%s', end: '%s' is either invalid or not present in build '%s'. " % \
( chrom, start, end, dbkey )
warnings.append(warning)
if not invalid_lines:
invalid_lines = get_lines(feature)
first_invalid_line = line_count
skipped_lines += len(invalid_lines)
continue
if includes_strand_col and strand == "-":
sequence = reverse_complement(sequence)
if output_format == "fasta":
l = len(sequence)
c = 0
if gff_format:
start, end = gff_util.convert_bed_coords_to_gff([start, end])
fields = [dbkey, str(chrom), str(start), str(end), strand]
meta_data = "_".join(fields)
if name.strip():
fout.write(">%s %s\n" % (meta_data, name))
else:
fout.write(">%s\n" % meta_data)
while c < l:
b = min(c + 50, l)
fout.write("%s\n" % str(sequence[c:b]))
c = b
else: # output_format == "interval"
if gff_format and interpret_features:
# TODO: need better GFF Reader to capture all information needed
# to produce this line.
meta_data = "\t".join([
feature.chrom, "galaxy_extract_genomic_dna", "interval",
str(feature.start),
str(feature.end), feature.score, feature.strand, ".",
gff_util.gff_attributes_to_str(feature.attributes, "GTF")
])
else:
meta_data = "\t".join(fields)
if gff_format:
format_str = "%s seq \"%s\";\n"
else:
format_str = "%s\t%s\n"
fout.write(format_str % (meta_data, str(sequence)))
# Update line count.
if isinstance(feature, gff_util.GFFFeature):
line_count += len(feature.intervals)
else:
line_count += 1
fout.close()
if warnings:
warn_msg = "%d warnings, 1st is: " % len(warnings)
warn_msg += warnings[0]
print warn_msg
if skipped_lines:
# Error message includes up to the first 10 skipped lines.
print 'Skipped %d invalid lines, 1st is #%d, "%s"' % (
skipped_lines, first_invalid_line, '\n'.join(invalid_lines[:10]))
# Clean up temp file.
if fasta_file:
os.remove(seq_path)
os.remove(tmp_name)