/usr/lib/python2.7/dist-packages/cogent/app/flash.py is in python-cogent 1.9-9.
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# file: flash.py
# Application controller for FLASh v1.2.7
# Fast Length Adjustment of Short reads:
# http://ccb.jhu.edu/software/FLASH/
from cogent.app.parameters import ValuedParameter, FlagParameter
from cogent.app.util import CommandLineApplication, ResultPath, \
ApplicationError
import os
import tempfile
__author__ = "Michael Robeson"
__copyright__ = "Copyright 2007-2013, The Cogent Project"
__credits__ = ["Michael Robeson"]
__license__ = "GPL"
__version__ = "1.9"
__maintainer__ = "Michael Robeson"
__email__ = "robesonms@ornl.gov"
__status__ = "Development"
class Flash(CommandLineApplication):
"""FLASh (v1.2.7) application controller for paired-end illumina data"""
_command = 'flash'
_parameters = {
# Descriptions of parameters copied directly from 'flash -h'
# and pasted below.
# NOTE: FLASh does not have flags for infiles.
# These will be handled in separate convenience functions below
# via the input handlers '_input_as_path' and _input_as_paths.
# -m, --min-overlap
# The minimum required overlap length between two
# reads to provide a confident overlap. Default:
# 10bp.
'-m':ValuedParameter(Prefix='-', Delimiter=' ', Name='m'),
# -M, --max-overlap
# Maximum overlap length expected in approximately
# 90% of read pairs. It is by default set to 70bp,
# which works well for 100bp reads generated from a
# 180bp library, assuming a normal distribution of
# fragment lengths. Overlaps longer than the maximum
# overlap parameter are still considered as good
# overlaps, but the mismatch density (explained below)
# is calculated over the first max_overlap bases in
# the overlapped region rather than the entire
# overlap. Default: 70bp, or calculated from the
# specified read length, fragment length, and fragment
# length standard deviation.
'-M':ValuedParameter(Prefix='-', Delimiter=' ', Name='M'),
# -x, --max-mismatch-density
# Maximum allowed ratio between the number of
# mismatched base pairs and the overlap length.
# Two reads will not be combined with a given overlap
# if that overlap results in a mismatched base density
# higher than this value. Note: Any occurence of an
# 'N' in either read is ignored and not counted
# towards the mismatches or overlap length. Our
# experimental results suggest that higher values of
# the maximum mismatch density yield larger
# numbers of correctly merged read pairs but at
# the expense of higher numbers of incorrectly
# merged read pairs. Default: 0.25.
'-x':ValuedParameter(Prefix='-', Delimiter=' ', Name='x'),
# -p, --phred-offset=OFFSET
# The smallest ASCII value of the characters used to
# represent quality values of bases in FASTQ files.
# It should be set to either 33, which corresponds
# to the later Illumina platforms and Sanger
# platforms, or 64, which corresponds to the
# earlier Illumina platforms. Default: 33.
'-p':ValuedParameter(Prefix='-', Delimiter=' ', Name='p'),
# -r, --read-len=LEN
# -f, --fragment-len=LEN
# -s, --fragment-len-stddev=LEN
# Average read length, fragment length, and fragment
# standard deviation. These are convenience parameters
# only, as they are only used for calculating the
# maximum overlap (--max-overlap) parameter.
# The maximum overlap is calculated as the overlap of
# average-length reads from an average-size fragment
# plus 2.5 times the fragment length standard
# deviation. The default values are -r 100, -f 180,
# and -s 18, so this works out to a maximum overlap of
# 70 bp. If --max-overlap is specified, then the
# specified value overrides the calculated value.
# If you do not know the standard deviation of the
# fragment library, you can probably assume that the
# standard deviation is 10% of the average fragment
# length.
'-r':ValuedParameter(Prefix='-', Delimiter=' ', Name='r'),
'-f':ValuedParameter(Prefix='-', Delimiter=' ', Name='f'),
'-s':ValuedParameter(Prefix='-', Delimiter=' ', Name='s'),
# --interleaved-input
# Instead of requiring files MATES_1.FASTQ and
# MATES_2.FASTQ, allow a single file MATES.FASTQ that
# has the paired-end reads interleaved. Specify "-"
# to read from standard input.
'--interleaved-input':FlagParameter(Prefix='--', Name='interleaved-input'),
# --interleaved-output
# Write the uncombined pairs in interleaved format.
'--interleaved-output':FlagParameter(Prefix='--', Name='interleaved-output'),
# -I, --interleaved
# Equivalent to specifying both --interleaved-input
# and --interleaved-output.
'-I':FlagParameter(Prefix='-', Name='I'),
# -o, --output-prefix=PREFIX
# Prefix of output files. Default: "out".
'-o':ValuedParameter(Prefix='-', Delimiter=' ', Name='o'),
# -d, --output-directory=DIR
# Path to directory for output files. Default:
# current working directory.
'-d':ValuedParameter(Prefix='-', Delimiter=' ', Name='d'),
# -c, --to-stdout
# Write the combined reads to standard output; do not
# write uncombined reads to anywhere.
'-c':FlagParameter(Prefix='-', Name='c'),
# -z, --compress
# Compress the FASTQ output files directly with zlib.
# Similar to specifying --compress-prog=gzip and
# --suffix=gz, but may be slightly faster.
'-z':FlagParameter(Prefix='-', Name='z'),
# --compress-prog=PROG
# Pipe the output through the compression program
# PROG, which will be called as `PROG -c -',
# plus any arguments specified by --compress-prog-args.
# PROG must read uncompressed data from standard input
# and write compressed data to standard output.
# Examples: gzip, bzip2, xz, pigz.
'--compress-prog':FlagParameter(Prefix='--', Name='compress-prog'),
# --compress-prog-args=ARGS
# A string of arguments that will be passed to the
# compression program if one is specified with
# --compress-prog. Note: the argument -c is already
# assumed.
'--compress-prog-args':ValuedParameter(Prefix='--', Delimiter=' ',
Name='compress-prog-args'),
# --suffix=SUFFIX, --output-suffix=SUFFIX
# Use SUFFIX as the suffix of the output files
# after ".fastq". A dot before the suffix is assumed,
# unless an empty suffix is provided. Default:
# nothing; or 'gz' if -z is specified; or PROG if
# --compress-prog is specified.
'--suffix':ValuedParameter(Prefix='--', Delimiter=' ', Name='suffix'),
'--output-suffix':ValuedParameter(Prefix='--', Delimiter=' ',
Name='output-suffix'),
# -t, --threads=NTHREADS
# Set the number of worker threads. This is in
# addition to the I/O threads. Default: number of
# processors. Note: if you need FLASH's output to
# appear deterministically or in the same order as
# the original reads, you must specify -t 1
# (--threads=1).
'-t':ValuedParameter(Prefix='-', Delimiter=' ', Name='t'),
# -q, --quiet
# Do not print informational messages. (Implied with
# --to-stdout.)
'-q':FlagParameter(Prefix='-', Name='q'),
# -h, --help
# Display this help and exit.
'-h':FlagParameter(Prefix='-', Name='h'),
# -v, --version
# Display version.
'-v':FlagParameter(Prefix='-', Name='v')}
_synonyms = {
'--min-overlap':'-m',
'--max-overlap':'-M',
'--max-mismatch-density':'-x',
'--phred-offset':'-p',
'--read-len':'-r',
'--fragment-len':'-f',
'--fragment-len-stddev':'-s',
'--interleaved':'-I',
'--output-prefix':'-o',
'--output-directory':'-d',
'--to-stdout':'-c',
'--compress':'-z',
'--threads':'-t',
'--quiet':'q',
'--help':'-h',
'--version':'-v'}
_input_handler = '_input_as_paths'
def _output_dir_path(self):
if self.Parameters['-d'].isOn():
output_dir_path = self._absolute(str(self.Parameters['-d'].Value)
+'/')
else:
raise ValueError, "No output diretory specified."
return output_dir_path
def _output_label(self):
if self.Parameters['-o'].isOn():
base_outfile_name = str(self.Parameters['-o'].Value)
else:
raise ValueError, "No base outfile label specified."
return base_outfile_name
def _get_result_paths(self, data):
"""Captures FLASh output paths.
FLASh defaults writing output to 5 files:
- the assembled reads stored as *.extendedFrags.fastq
- reads1 that failed to assemble as *.notCombined_1.fastq'
- reads2 that failed to assemble as *.notCombined_2.fastq'
- hist frag size x sequence count *.hist
- histogram frag size distribution *.histogram
Where '*' is set by the '-d' (directory output path) and
'-o' (output file label) flags.
e.g. -d = '/home/usr/data_out/' and
-o = 'my_assembly' are converted to these paths:
/home/usr/data_out/myassembly.extendedFrags.fastq'
/home/usr/data_out/myassembly.notCombined_1.fastq'
/home/usr/data_out/myassembly.notCombined_2.fastq'
/home/usr/data_out/myassembly.hist'
/home/usr/data_out/myassembly.histogram'
"""
output_dir_path = self._output_dir_path()
base_outfile_name = self._output_label()
result = {}
result['Assembled'] = ResultPath(Path = output_dir_path +
base_outfile_name +
'.extendedFrags.fastq',
IsWritten=True)
result['UnassembledReads1'] = ResultPath(Path = output_dir_path +
base_outfile_name +
'.notCombined_1.fastq',
IsWritten=True)
result['UnassembledReads2'] = ResultPath(Path = output_dir_path +
base_outfile_name +
'.notCombined_2.fastq',
IsWritten=True)
result['NumHist'] = ResultPath(Path = output_dir_path +
base_outfile_name +
'.hist',
IsWritten=True)
result['Histogram'] = ResultPath(Path = output_dir_path +
base_outfile_name +
'.histogram',
IsWritten=True)
return result
def getHelp(self):
"""FLASh (v1.2.7) description and help."""
help_str =\
"""
For basic help, type the following at the command line:
'flash -h'
Website:
http://ccb.jhu.edu/software/FLASH/
For questions / comments send e-mail to:
flash.comment@gmail.com
"""
return help_str
###################################################
# SOME FUNCTIONS TO EXECUTE THE MOST COMMON TASKS #
###################################################
def join_paired_end_reads_flash(
reads1_infile_path,
reads2_infile_path,
outfile_label='FLASH',
read_length='100',
frag_length='180',
frag_std_dev='18',
mis_match_density='0.25',
min_overlap='10',
num_threads='1',
max_overlap=None,
working_dir=tempfile.gettempdir(),
params={},
SuppressStderr=True,
SuppressStdout=True,
HALT_EXEC=False):
"""Runs FLASh, to assemble paired-end reads.
Default settings are for HISEQ.
-reads1_infile_path : reads1.fastq infile path
-reads2_infile_path : reads2.fastq infile path
-outfile_label : base name for output files
-read_length : average length of individual reads
-frag_length : average length of assembled reads
-frag_std_dev : fragment length standard deviation, ~ 10% of frag_length
-mis_match_identity : max allowable ratio of mismatched bases and
overlap length. Reads above this value will not be assembled.
-min_overlap : minimum allowable overlab to assemble reads
-max_overlap : if set this will override the settings specified by
'-r','-s', and '-f'. These three parameters are used to dynamically
calculate max_overlap when max_overlap is not provided.
-num_threads : number of CPUs [default 1]
For HISEQ a good default 'max_overlap' would be between '70' to '100'.
For MISEQ try these parameters if you assume ~380 bp assembled frags
with highly overlaping reads (reads get the full 250 bp):
read_length=\'250\' frag_length=\'380\' frag_std_dev=\'38\', or
alternatively: max_overlap = \'120\'
"""
# There are no input options for fastq infiles. So, we check if they exist
# and store them as a list for later input via '_input_as_paths'
# for the default '_input_handler'.
abs_r1_path = os.path.abspath(reads1_infile_path)
abs_r2_path = os.path.abspath(reads2_infile_path)
infile_paths = [abs_r1_path, abs_r2_path]
# check / make absolute infile paths
for p in infile_paths:
if not os.path.exists(p):
raise IOError, 'Infile not found at: %s' % p
# required params
params['-d'] = working_dir #output_dir
params['-o'] = outfile_label
params['-x'] = mis_match_density
params['-m'] = min_overlap
params['-t'] = num_threads
if max_overlap:
params['-M'] = max_overlap
else:
params['-f'] = frag_length
params['-s'] = frag_std_dev
params['-r'] = read_length
# set up assembler
flash_app = Flash(params=params,
WorkingDir=working_dir,
SuppressStderr=SuppressStderr,
SuppressStdout=SuppressStdout,
HALT_EXEC=HALT_EXEC)
# run assembler
result = flash_app(infile_paths) # use default '_input_as_paths'
# Store output file path data to dict
path_dict = {}
path_dict['Assembled'] = result['Assembled'].name
path_dict['UnassembledReads1'] = result['UnassembledReads1'].name
path_dict['UnassembledReads2'] = result['UnassembledReads2'].name
path_dict['NumHist'] = result['NumHist'].name
path_dict['Histogram'] = result['Histogram'].name
# sanity check that files actually exist in path lcoations
for path in path_dict.values():
if not os.path.exists(path):
raise IOError, 'Output file not found at: %s' % path
return path_dict
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