details: http://www.bx.psu.edu/hg/galaxy/rev/61b09dc1dff2 changeset: 3619:61b09dc1dff2 user: rc date: Wed Apr 07 11:12:00 2010 -0400 description: sff converter tool
diffstat:
tool_conf.xml.sample | 1 + tools/filters/sff_extract.py | 1505 +++++++++++++++++++++++++++++++++++++++ tools/filters/sff_extractor.xml | 22 + 3 files changed, 1528 insertions(+), 0 deletions(-)
diffs (1546 lines):
diff -r ebfc9236bf5a -r 61b09dc1dff2 tool_conf.xml.sample --- a/tool_conf.xml.sample Wed Apr 07 08:44:57 2010 -0400 +++ b/tool_conf.xml.sample Wed Apr 07 11:12:00 2010 -0400 @@ -78,6 +78,7 @@ <tool file="fasta_tools/tabular_to_fasta.xml" /> <tool file="fastx_toolkit/fastq_to_fasta.xml" /> <tool file="filters/wiggle_to_simple.xml" /> + <tool file="filters/sff_extractor.xml" /> </section> <section name="Extract Features" id="features"> <tool file="filters/ucsc_gene_bed_to_exon_bed.xml" /> diff -r ebfc9236bf5a -r 61b09dc1dff2 tools/filters/sff_extract.py --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tools/filters/sff_extract.py Wed Apr 07 11:12:00 2010 -0400 @@ -0,0 +1,1505 @@ +#!/usr/bin/python +'''This software extracts the seq, qual and ancillary information from an sff +file, like the ones used by the 454 sequencer. + +Optionally, it can also split paired-end reads if given the linker sequence. +The splitting is done with maximum match, i.e., every occurence of the linker +sequence will be removed, even if occuring multiple times.''' + +#copyright Jose Blanca and Bastien Chevreux +#COMAV institute, Universidad Politecnica de Valencia (UPV) +#Valencia, Spain + +# additions to handle paired end reads by Bastien Chevreux +# bugfixes for linker specific lengths: Lionel Guy + +#This program is free software: you can redistribute it and/or modify +#it under the terms of the GNU General Public License as published by +#the Free Software Foundation, either version 3 of the License, or +#(at your option) any later version. +#This program is distributed in the hope that it will be useful, +#but WITHOUT ANY WARRANTY; without even the implied warranty of +#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +#GNU General Public License for more details. +#You should have received a copy of the GNU General Public License +#along with this program. If not, see http://www.gnu.org/licenses/. + +__author__ = 'Jose Blanca and Bastien Chevreux' +__copyright__ = 'Copyright 2008, Jose Blanca, COMAV, and Bastien Chevreux' +__license__ = 'GPLv3 or later' +__version__ = '0.2.8' +__email__ = 'jblanca@btc.upv.es' +__status__ = 'beta' + +import struct +import sys +import os +import subprocess +import tempfile + + +fake_sff_name = 'fake_sff_name' + + +# readname as key: lines with matches from SSAHA, one best match +ssahapematches = {} +# linker readname as key: length of linker sequence +linkerlengths = {} + +# set to true if something really fishy is going on with the sequences +stern_warning = True + +def read_bin_fragment(struct_def, fileh, offset=0, data=None, + byte_padding=None): + '''It reads a chunk of a binary file. + + You have to provide the struct, a file object, the offset (where to start + reading). + Also you can provide an optional dict that will be populated with the + extracted data. + If a byte_padding is given the number of bytes read will be a multiple of + that number, adding the required pad at the end. + It returns the number of bytes reads and the data dict. + ''' + if data is None: + data = {} + + #we read each item + bytes_read = 0 + for item in struct_def: + #we go to the place and read + fileh.seek(offset + bytes_read) + n_bytes = struct.calcsize(item[1]) + buffer = fileh.read(n_bytes) + read = struct.unpack('>' + item[1], buffer) + if len(read) == 1: + read = read[0] + data[item[0]] = read + bytes_read += n_bytes + + #if there is byte_padding the bytes_to_read should be a multiple of the + #byte_padding + if byte_padding is not None: + pad = byte_padding + bytes_read = ((bytes_read + pad - 1) // pad) * pad + + return (bytes_read, data) + + +def check_magic(magic): + '''It checks that the magic number of the file matches the sff magic.''' + if magic != 779314790: + raise RuntimeError('This file does not seems to be an sff file.') + +def check_version(version): + '''It checks that the version is supported, otherwise it raises an error.''' + supported = ('\x00', '\x00', '\x00', '\x01') + i = 0 + for item in version: + if version[i] != supported[i]: + raise RuntimeError('SFF version not supported. Please contact the author of the software.') + i += 1 + +def read_header(fileh): + '''It reads the header from the sff file and returns a dict with the + information''' + #first we read the first part of the header + head_struct = [ + ('magic_number', 'I'), + ('version', 'cccc'), + ('index_offset', 'Q'), + ('index_length', 'I'), + ('number_of_reads', 'I'), + ('header_length', 'H'), + ('key_length', 'H'), + ('number_of_flows_per_read', 'H'), + ('flowgram_format_code', 'B'), + ] + data = {} + first_bytes, data = read_bin_fragment(struct_def=head_struct, fileh=fileh, + offset=0, data=data) + check_magic(data['magic_number']) + check_version(data['version']) + #now that we know the number_of_flows_per_read and the key_length + #we can read the second part of the header + struct2 = [ + ('flow_chars', str(data['number_of_flows_per_read']) + 'c'), + ('key_sequence', str(data['key_length']) + 'c') + ] + read_bin_fragment(struct_def=struct2, fileh=fileh, offset=first_bytes, + data=data) + return data + + +def read_sequence(header, fileh, fposition): + '''It reads one read from the sff file located at the fposition and + returns a dict with the information.''' + header_length = header['header_length'] + index_offset = header['index_offset'] + index_length = header['index_length'] + + #the sequence struct + read_header_1 = [ + ('read_header_length', 'H'), + ('name_length', 'H'), + ('number_of_bases', 'I'), + ('clip_qual_left', 'H'), + ('clip_qual_right', 'H'), + ('clip_adapter_left', 'H'), + ('clip_adapter_right', 'H'), + ] + def read_header_2(name_length): + '''It returns the struct definition for the second part of the header''' + return [('name', str(name_length) +'c')] + def read_data(number_of_bases): + '''It returns the struct definition for the read data section.''' + #size = {'c': 1, 'B':1, 'H':2, 'I':4, 'Q':8} + if header['flowgram_format_code'] == 1: + flow_type = 'H' + else: + raise Error('file version not supported') + number_of_bases = str(number_of_bases) + return [ + ('flowgram_values', str(header['number_of_flows_per_read']) + + flow_type), + ('flow_index_per_base', number_of_bases + 'B'), + ('bases', number_of_bases + 'c'), + ('quality_scores', number_of_bases + 'B'), + ] + + data = {} + #we read the first part of the header + bytes_read, data = read_bin_fragment(struct_def=read_header_1, + fileh=fileh, offset=fposition, data=data) + + read_bin_fragment(struct_def=read_header_2(data['name_length']), + fileh=fileh, offset=fposition + bytes_read, data=data) + #we join the letters of the name + data['name'] = ''.join(data['name']) + offset = data['read_header_length'] + #we read the sequence and the quality + read_data_st = read_data(data['number_of_bases']) + bytes_read, data = read_bin_fragment(struct_def=read_data_st, + fileh=fileh, offset=fposition + offset, + data=data, byte_padding=8) + #we join the bases + data['bases'] = ''.join(data['bases']) + + #print data + #print "pre cqr: ", data['clip_qual_right'] + #print "pre car: ", data['clip_adapter_right'] + #print "pre cql: ", data['clip_qual_left'] + #print "pre cal: ", data['clip_adapter_left'] + + # correct for the case the right clip is <= than the left clip + # in this case, left clip is 0 are set to 0 (right clip == 0 means + # "whole sequence") + if data['clip_qual_right'] <= data['clip_qual_left'] : + data['clip_qual_right'] = 0 + data['clip_qual_left'] = 0 + if data['clip_adapter_right'] <= data['clip_adapter_left'] : + data['clip_adapter_right'] = 0 + data['clip_adapter_left'] = 0 + + #the clipping section follows the NCBI's guidelines Trace Archive RFC + #http://www.ncbi.nlm.nih.gov/Traces/trace.cgi?cmd=show&f=rfc&m=doc&am... + #if there's no adapter clip: qual -> vector + #else: qual-> qual + # adapter -> vector + + if not data['clip_adapter_left']: + data['clip_adapter_left'], data['clip_qual_left'] = data['clip_qual_left'], data['clip_adapter_left'] + if not data['clip_adapter_right']: + data['clip_adapter_right'], data['clip_qual_right'] = data['clip_qual_right'], data['clip_adapter_right'] + + # see whether we have to override the minimum left clips + if config['min_leftclip'] > 0: + if data['clip_adapter_left'] >0 and data['clip_adapter_left'] < config['min_leftclip']: + data['clip_adapter_left'] = config['min_leftclip'] + if data['clip_qual_left'] >0 and data['clip_qual_left'] < config['min_leftclip']: + data['clip_qual_left'] = config['min_leftclip'] + + + #print "post cqr: ", data['clip_qual_right'] + #print "post car: ", data['clip_adapter_right'] + #print "post cql: ", data['clip_qual_left'] + #print "post cal: ", data['clip_adapter_left'] + + + # for handling the -c (clip) option gently, we already clip here + # and set all clip points to the sequence end points + if config['clip']: + data['bases'], data['quality_scores'] = clip_read(data) + + data['number_of_bases']=len(data['bases']) + data['clip_qual_right'] = data['number_of_bases'] + data['clip_adapter_right'] = data['number_of_bases'] + data['clip_qual_left'] = 0 + data['clip_adapter_left'] = 0 + + return data['read_header_length'] + bytes_read, data + + +def sequences(fileh, header): + '''It returns a generator with the data for each read.''' + #now we can read all the sequences + fposition = header['header_length'] #position in the file + reads_read = 0 + while True: + if fposition == header['index_offset']: + #we have to skip the index section + fposition += index_length + continue + else: + bytes_read, seq_data = read_sequence(header=header, fileh=fileh, + fposition=fposition) + yield seq_data + fposition += bytes_read + reads_read += 1 + if reads_read >= header['number_of_reads']: + break + + +def remove_last_xmltag_in_file(fname, tag=None): + '''Given an xml file name and a tag, it removes the last tag of the + file if it matches the given tag. Tag removal is performed via file + truncation. + + It the given tag is not the last in the file, a RunTimeError will be + raised. + + The resulting xml file will be not xml valid. This function is a hack + that allows to append records to xml files in a quick and dirty way. + ''' + + fh = open(fname, 'r+') + #we have to read from the end to the start of the file and keep the + #string enclosed by </ > + i = -1 + last_tag = [] #the chars that form the last tag + start_offset = None #in which byte does the last tag starts? + end_offset = None #in which byte does the last tag ends? + while True: + fh.seek(i, 2) + char = fh.read(1) + if not char.isspace(): + last_tag.append(char) + if char == '>': + end_offset = i + if char == '<': + start_offset = i + break + i -= 1 + + #we have read the last tag backwards + last_tag = ''.join(last_tag[::-1]) + #we remove the </ and > + last_tag = last_tag.rstrip('>').lstrip('</') + + #we check that we're removing the asked tag + if tag is not None and tag != last_tag: + raise RuntimeError("The given xml tag wasn't the last one in the file") + + # while we are at it: also remove all white spaces in that line :-) + i -= 1 + while True: + fh.seek(i, 2) + char = fh.read(1) + if not char == ' ' and not char == '\t': + break; + if fh.tell() == 1: + break; + i -= 1 + + fh.truncate(); + + fh.close() + return last_tag + + +def create_basic_xml_info(readname, fname): + '''Formats a number of read specific infos into XML format. + Currently formated: name and the tags set from command line + ''' + to_print = [' <trace>\n'] + to_print.append(' <trace_name>') + to_print.append(readname) + to_print.append('</trace_name>\n') + + #extra information + #do we have extra info for this file? + info = None + if config['xml_info']: + #with this name? + if fname in config['xml_info']: + info = config['xml_info'][fname] + else: + #with no name? + try: + info = config['xml_info'][fake_sff_name] + except KeyError: + pass + #we print the info that we have + if info: + for key in info: + to_print.append(' <' + key + '>' + info[key] + \ + '</' + key +'>\n') + + return ''.join(to_print) + + +def create_clip_xml_info(readlen, adapl, adapr, quall, qualr): + '''Takes the clip values of the read and formats them into XML + Corrects "wrong" values that might have resulted through + simplified calculations earlier in the process of conversion + (especially during splitting of paired-end reads) + ''' + + to_print = [""] + + # if right borders are >= to read length, they don't need + # to be printed + if adapr >= readlen: + adapr = 0 + if qualr >= readlen: + qualr = 0 + + # BaCh + # when called via split_paired_end(), some values may be < 0 + # (when clip values were 0 previously) + # instead of putting tons of if clauses for different calculations there, + # I centralise corrective measure here + # set all values <0 to 0 + + if adapr < 0: + adapr = 0 + if qualr <0: + qualr = 0 + if adapl < 0: + adapl = 0 + if quall <0: + quall = 0 + + if quall: + to_print.append(' <clip_quality_left>') + to_print.append(str(quall)) + to_print.append('</clip_quality_left>\n') + if qualr: + to_print.append(' <clip_quality_right>') + to_print.append(str(qualr)) + to_print.append('</clip_quality_right>\n') + if adapl: + to_print.append(' <clip_vector_left>') + to_print.append(str(adapl)) + to_print.append('</clip_vector_left>\n') + if adapr: + to_print.append(' <clip_vector_right>') + to_print.append(str(adapr)) + to_print.append('</clip_vector_right>\n') + return ''.join(to_print) + + +def create_xml_for_unpaired_read(data, fname): + '''Given the data for one read it returns an str with the xml ancillary + data.''' + to_print = [create_basic_xml_info(data['name'],fname)] + #clippings in the XML only if we do not hard clip + if not config['clip']: + to_print.append(create_clip_xml_info(data['number_of_bases'],data['clip_adapter_left'], data['clip_adapter_right'], data['clip_qual_left'], data['clip_qual_right'])); + to_print.append(' </trace>\n') + return ''.join(to_print) + + +def format_as_fasta(name,seq,qual): + name_line = ''.join(('>', name,'\n')) + seqstring = ''.join((name_line, seq, '\n')) + qual_line = ' '.join([str(q) for q in qual]) + qualstring = ''.join((name_line, qual_line, '\n')) + return seqstring, qualstring + +def format_as_fastq(name,seq,qual): + qual_line = ''.join([chr(q+33) for q in qual]) + #seqstring = ''.join(('@', name,'\n', seq, '\n+', name,'\n', qual_line, '\n')) + seqstring = ''.join(('@', name,'\n', seq, '\n+\n', qual_line, '\n')) + return seqstring + + +def get_read_data(data): + '''Given the data for one read it returns 2 strs with the fasta seq + and fasta qual.''' + #seq and qual + if config['mix_case']: + seq = sequence_case(data) + qual = data['quality_scores'] + else : + seq = data['bases'] + qual = data['quality_scores'] + + return seq, qual + +def extract_read_info(data, fname): + '''Given the data for one read it returns 3 strs with the fasta seq, fasta + qual and xml ancillary data.''' + + seq,qual = get_read_data(data) + seqstring, qualstring = format_as_fasta(data['name'],seq,qual) + + #name_line = ''.join(('>', data['name'],'\n')) + #seq = ''.join((name_line, seq, '\n')) + #qual_line = ' '.join([str(q) for q in qual]) + #qual = ''.join((name_line, qual_line, '\n')) + + xmlstring = create_xml_for_unpaired_read(data, fname) + + return seqstring, qualstring, xmlstring + +def write_sequence(name,seq,qual,seq_fh,qual_fh): + '''Write sequence and quality FASTA and FASTA qual filehandles + (or into FASTQ and XML) + if sequence length is 0, don't write''' + + if len(seq) == 0 : return + + if qual_fh is None: + seq_fh.write(format_as_fastq(name,seq,qual)) + else: + seqstring, qualstring = format_as_fasta(name,seq,qual) + seq_fh.write(seqstring) + qual_fh.write(qualstring) + return + +def write_unpaired_read(data, sff_fh, seq_fh, qual_fh, xml_fh): + '''Writes an unpaired read into FASTA, FASTA qual and XML filehandles + (or into FASTQ and XML) + if sequence length is 0, don't write''' + + seq,qual = get_read_data(data) + if len(seq) == 0 : return + + write_sequence(data['name'],seq,qual,seq_fh,qual_fh) + + anci = create_xml_for_unpaired_read(data, sff_fh.name) + if anci is not None: + xml_fh.write(anci) + return + + +def reverse_complement(seq): + '''Returns the reverse complement of a DNA sequence as string''' + + compdict = { + 'a': 't', + 'c': 'g', + 'g': 'c', + 't': 'a', + 'u': 't', + 'm': 'k', + 'r': 'y', + 'w': 'w', + 's': 's', + 'y': 'r', + 'k': 'm', + 'v': 'b', + 'h': 'd', + 'd': 'h', + 'b': 'v', + 'x': 'x', + 'n': 'n', + 'A': 'T', + 'C': 'G', + 'G': 'C', + 'T': 'A', + 'U': 'T', + 'M': 'K', + 'R': 'Y', + 'W': 'W', + 'S': 'S', + 'Y': 'R', + 'K': 'M', + 'V': 'B', + 'H': 'D', + 'D': 'H', + 'B': 'V', + 'X': 'X', + 'N': 'N', + '*': '*' + } + + complseq = ''.join([compdict[base] for base in seq]) + # python hack to reverse a list/string/etc + complseq = complseq[::-1] + return complseq + + +def mask_sequence(seq, maskchar, fpos, tpos): + '''Given a sequence, mask it with maskchar starting at fpos (including) and + ending at tpos (excluding) + ''' + + if len(maskchar) > 1: + raise RuntimeError("Internal error: more than one character given to mask_sequence") + if fpos<0: + fpos = 0 + if tpos > len(seq): + tpos = len(seq) + + newseq = ''.join((seq[:fpos],maskchar*(tpos-fpos), seq[tpos:])) + + return newseq + + +def fragment_sequences(sequence, qualities, splitchar): + '''Works like split() on strings, except it does this on a sequence + and the corresponding list with quality values. + Returns a tuple for each fragment, each sublist has the fragment + sequence as first and the fragment qualities as second elemnt''' + + # this is slow (due to zip and list appends... use an iterator over + # the sequence find find variations and splices on seq and qual + + if len(sequence) != len(qualities): + print sequence, qualities + raise RuntimeError("Internal error: length of sequence and qualities don't match???") + + retlist = ([]) + if len(sequence) == 0: + return retlist + + actseq = ([]) + actqual = ([]) + if sequence[0] != splitchar: + inseq = True + else: + inseq = False + for char,qual in zip(sequence,qualities): + if inseq: + if char != splitchar: + actseq.append(char) + actqual.append(qual) + else: + retlist.append((''.join(actseq), actqual)) + actseq = ([]) + actqual = ([]) + inseq = False + else: + if char != splitchar: + inseq = True + actseq.append(char) + actqual.append(qual) + + if inseq and len(actseq): + retlist.append((''.join(actseq), actqual)) + + return retlist + + +def calc_subseq_boundaries(maskedseq, maskchar): + '''E.g.: + ........xxxxxxxx..........xxxxxxxxxxxxxxxxxxxxx......... + to + (0,8),(8,16),(16,26),(26,47),(47,56) + ''' + + blist = ([]) + if len(maskedseq) == 0: + return blist + + inmask = True + if maskedseq[0] != maskchar: + inmask = False + + start = 0 + for spos in range(len(maskedseq)): + if inmask and maskedseq[spos] != maskchar: + blist.append(([start,spos])) + start = spos + inmask = False + elif not inmask and maskedseq[spos] == maskchar: + blist.append(([start,spos])) + start = spos + inmask = True + + blist.append(([start,spos+1])) + + return blist + + +def correct_for_smallhits(maskedseq, maskchar, linkername): + '''If partial hits were found, take preventive measure: grow + the masked areas by 20 bases in each direction + Returns either unchanged "maskedseq" or a new sequence + with some more characters masked. + ''' + global linkerlengths + + CEBUG = 0 + + if CEBUG : print "correct_for_smallhits" + if CEBUG : print "Masked seq\n", maskedseq + if CEBUG : print "Linkername: ", linkername + + if len(maskedseq) == 0: + return maskedseq + + growl=40 + growl2=growl/2 + + boundaries = calc_subseq_boundaries(maskedseq,maskchar) + if CEBUG : print "Boundaries: ", boundaries + + foundpartial = False + for bounds in boundaries: + if CEBUG : print "\tbounds: ", bounds + left, right = bounds + if left != 0 and right != len(maskedseq): + if maskedseq[left] == maskchar: + # allow 10% discrepancy + # -linkerlengths[linkername]/10 + # that's a kind of safety net if there are slight sequencing + # errors in the linker itself + if right-left < linkerlengths[linkername]-linkerlengths[linkername]/10: + if CEBUG : print "\t\tPartial: found " + str(right-left) + " gaps, " + linkername + " is " + str(linkerlengths[linkername]) + " nt long." + foundpartial = True + + if not foundpartial: + return maskedseq + + # grow + newseq = "" + for bounds in boundaries: + if CEBUG : print "Bounds: ", bounds + left, right = bounds + if maskedseq[left] == maskchar: + newseq += maskedseq[left:right] + else: + clearstart = 0 + if left > 0 : + clearstart = left+growl2 + clearstop = len(maskedseq) + if right < len(maskedseq): + clearstop = right-growl2 + + if CEBUG : print "clearstart, clearstop: ",clearstart, clearstop + + if clearstop <= clearstart: + newseq += maskchar * (right-left) + else: + if clearstart != left: + newseq += maskchar * growl2 + newseq += maskedseq[clearstart:clearstop] + if clearstop != right: + newseq += maskchar * growl2 + + #print "newseq\n",newseq + + return newseq + + +def split_paired_end(data, sff_fh, seq_fh, qual_fh, xml_fh): + '''Splits a paired end read and writes sequences into FASTA, FASTA qual + and XML traceinfo file. Returns the number of sequences created. + + As the linker sequence may be anywhere in the read, including the ends + and overlapping with bad quality sequence, we need to perform some + computing and eventually set new clip points. + + If the resulting split yields only one sequence (because linker + was not present or overlapping with left or right clip), only one + sequence will be written with ".fn" appended to the name. + + If the read can be split, two reads will be written. The side left of + the linker will be named ".r" and will be written in reverse complement + into the file to conform with what approximately all assemblers expect + when reading paired-end data: reads in forward direction in file. The side + right of the linker will be named ".f" + + If SSAHA found partial linker (linker sequences < length of linker), + the sequences will get a "_pl" furthermore be cut back thoroughly. + + If SSAHA found multiple occurences of the linker, the names will get an + additional "_mlc" within the name to show that there was "multiple + linker contamination". + + For multiple or partial linker, the "good" parts of the reads are + stored with a ".part<number>" name, additionally they will not get + template information in the XML + ''' + + global ssahapematches + + CEBUG = 0 + + maskchar = "#" + + if CEBUG : print "Need to split: " + data['name'] + + numseqs = 0; + readname = data['name'] + readlen = data['number_of_bases'] + + leftclip, rightclip = return_merged_clips(data) + seq, qual = get_read_data(data) + + if CEBUG : print "Original read:\n",seq + + maskedseq = seq + if leftclip > 0: + maskedseq = mask_sequence(maskedseq, maskchar, 0, leftclip-1) + if rightclip < len(maskedseq): + maskedseq = mask_sequence(maskedseq, maskchar, rightclip, len(maskedseq)) + + leftclip, rightclip = return_merged_clips(data) + readlen = data['number_of_bases'] + + if CEBUG : print "Readname:", readname + if CEBUG : print "Readlen:", readlen + if CEBUG : print "Num matches:", str(len(ssahapematches[data['name']])) + if CEBUG : print "matches:", ssahapematches[data['name']] + + for match in ssahapematches[data['name']]: + score = int(match[0]) + linkername = match[2] + leftreadhit = int(match[3]) + rightreadhit = int(match[4]) + #leftlinkerhit = int(match[5]) + #rightlinkerhit = int(match[6]) + #direction = match[7] + #hitlen = int(match[8]) + #hitidentity = float(match[9]) + + if CEBUG : print match + if CEBUG : print "Match with score:", score + if CEBUG : print "Read before:\n", maskedseq + maskedseq = mask_sequence(maskedseq, maskchar, leftreadhit-1, rightreadhit) + if CEBUG : print "Masked seq:\n", maskedseq + + correctedseq = correct_for_smallhits(maskedseq, maskchar, linkername) + + if len(maskedseq) != len(correctedseq): + raise RuntimeError("Internal error: maskedseq != correctedseq") + + partialhits = False + if correctedseq != maskedseq: + if CEBUG : print "Partial hits in", readname + if CEBUG : print "Original seq:\n", seq + if CEBUG : print "Masked seq:\n", maskedseq + if CEBUG : print "Corrected seq\n", correctedseq + partialhits = True + readname += "_pl" + maskedseq = correctedseq + + fragments = fragment_sequences(maskedseq, qual, maskchar) + + if CEBUG : print "Fragments (", len(fragments), "): ", fragments + + mlcflag = False + #if len(ssahapematches[data['name']]) > 1: + # #print "Multi linker contamination" + # mlcflag = True + # readname += "_mlc" + + if len(fragments) > 2: + if CEBUG : print "Multi linker contamination" + mlcflag = True + readname += "_mlc" + + + #print fragments + if mlcflag or partialhits: + fragcounter = 1 + readname += ".part" + for frag in fragments: + actseq = frag[0] + if len(actseq) >= 20: + actqual = frag[1] + oname = readname + str(fragcounter) + #seq_fh.write(">"+oname+"\n") + #seq_fh.write(actseq+"\n") + #qual_fh.write(">"+oname+"\n") + #qual_fh.write(' '.join((str(q) for q in actqual))) + #qual_fh.write("\n") + write_sequence(oname,actseq,actqual,seq_fh,qual_fh) + to_print = [create_basic_xml_info(oname,sff_fh.name)] + # No clipping in XML ... the multiple and partial fragments + # are clipped "hard" + # No template ID and trace_end: we don't know the + # orientation of the frahments. Even if it were + # only two, the fact we had multiple linkers + # says something went wrong, so simply do not + # write any paired-end information for all these fragments + to_print.append(' </trace>\n') + xml_fh.write(''.join(to_print)) + numseqs += 1 + fragcounter += 1 + else: + if len(fragments) >2: + raise RuntimeError("Unexpected: more than two fragments detected in " + readname + ". please contact the authors.") + # nothing will happen for 0 fragments + if len(fragments) == 1: + #print "Tada1" + boundaries = calc_subseq_boundaries(maskedseq,maskchar) + if len(boundaries) < 1 or len(boundaries) >3: + raise RuntimeError("Unexpected case: ", str(len(boundaries)), "boundaries for 1 fragment of ", readname) + if len(boundaries) == 3: + # case: mask char on both sides of sequence + #print "bounds3" + data['clip_adapter_left']=1+boundaries[0][1] + data['clip_adapter_right']=boundaries[2][0] + elif len(boundaries) == 2: + # case: mask char left or right of sequence + #print "bounds2", + if maskedseq[0] == maskchar : + # case: mask char left + #print "left" + data['clip_adapter_left']=1+boundaries[0][1] + else: + # case: mask char right + #print "right" + data['clip_adapter_right']=boundaries[1][0] + data['name'] = data['name'] + ".fn" + write_unpaired_read(data, sff_fh, seq_fh, qual_fh, xml_fh) + numseqs = 1 + elif len(fragments) == 2: + #print "Tada2" + oname = readname + ".r" + seq, qual = get_read_data(data) + + startsearch = False + for spos in range(len(maskedseq)): + if maskedseq[spos] != maskchar: + startsearch = True; + else: + if startsearch: + break + + #print "\nspos: ", spos + lseq=seq[:spos] + #print "lseq:", lseq + actseq = reverse_complement(lseq) + lreadlen = len(actseq) + lqual = qual[:spos]; + # python hack to reverse a list/string/etc + lqual = lqual[::-1]; + + #seq_fh.write(">"+oname+"\n") + #seq_fh.write(actseq+"\n") + #qual_fh.write(">"+oname+"\n") + #qual_fh.write(' '.join((str(q) for q in lqual))) + #qual_fh.write("\n") + + write_sequence(oname,actseq,lqual,seq_fh,qual_fh) + + to_print = [create_basic_xml_info(oname,sff_fh.name)] + to_print.append(create_clip_xml_info(lreadlen, 0, lreadlen+1-data['clip_adapter_left'], 0, lreadlen+1-data['clip_qual_left'])); + to_print.append(' <template_id>') + to_print.append(readname) + to_print.append('</template_id>\n') + to_print.append(' <trace_end>r</trace_end>\n') + to_print.append(' </trace>\n') + xml_fh.write(''.join(to_print)) + + oname = readname + ".f" + startsearch = False + for spos in range(len(maskedseq)-1,-1,-1): + if maskedseq[spos] != maskchar: + startsearch = True; + else: + if startsearch: + break + + actseq = seq[spos+1:] + actqual = qual[spos+1:]; + + #print "\nspos: ", spos + #print "rseq:", actseq + + #seq_fh.write(">"+oname+"\n") + #seq_fh.write(actseq+"\n") + #qual_fh.write(">"+oname+"\n") + #qual_fh.write(' '.join((str(q) for q in actqual))) + #qual_fh.write("\n") + write_sequence(oname,actseq,actqual,seq_fh,qual_fh) + + rreadlen = len(actseq) + to_print = [create_basic_xml_info(oname,sff_fh.name)] + to_print.append(create_clip_xml_info(rreadlen, 0, rreadlen-(readlen-data['clip_adapter_right']), 0, rreadlen-(readlen-data['clip_qual_right']))); + to_print.append(' <template_id>') + to_print.append(readname) + to_print.append('</template_id>\n') + to_print.append(' <trace_end>f</trace_end>\n') + to_print.append(' </trace>\n') + xml_fh.write(''.join(to_print)) + numseqs = 2 + + return numseqs + + + +def extract_reads_from_sff(config, sff_files): + '''Given the configuration and the list of sff_files it writes the seqs, + qualities and ancillary data into the output file(s). + + If file for paired-end linker was given, first extracts all sequences + of an SFF and searches these against the linker(s) with SSAHA2 to + create needed information to split reads. + ''' + + global ssahapematches + + + if len(sff_files) == 0 : + raise RuntimeError("No SFF file given?") + + #we go through all input files + for sff_file in sff_files: + if not os.path.getsize(sff_file): + raise RuntimeError('Empty file? : ' + sff_file) + fh = open(sff_file, 'r') + fh.close() + + openmode = 'w' + if config['append']: + openmode = 'a' + + seq_fh = open(config['seq_fname'], openmode) + xml_fh = open(config['xml_fname'], openmode) + if config['want_fastq']: + qual_fh = None + try: + os.remove(config['qual_fname']) + except : + python_formattingwithoutbracesisdumb_dummy = 1 + else: + qual_fh = open(config['qual_fname'], openmode) + + if not config['append']: + xml_fh.write('<?xml version="1.0"?>\n<trace_volume>\n') + else: + remove_last_xmltag_in_file(config['xml_fname'], "trace_volume") + + #we go through all input files + for sff_file in sff_files: + #print "Working on '" + sff_file + "':" + ssahapematches.clear() + + seqcheckstore = ([]) + + debug = 0 + + if not debug and config['pelinker_fname']: + #print "Creating temporary sequences from reads in '" + sff_file + "' ... ", + sys.stdout.flush() + + if 0 : + # for debugging + pid = os.getpid() + tmpfasta_fname = 'sffe.tmp.'+ str(pid)+'.fasta' + tmpfasta_fh = open(tmpfasta_fname, 'w') + else: + tmpfasta_fh = tempfile.NamedTemporaryFile(prefix = 'sffeseqs_', + suffix = '.fasta') + + sff_fh = open(sff_file, 'rb') + header_data = read_header(fileh=sff_fh) + for seq_data in sequences(fileh=sff_fh, header=header_data): + seq,qual = get_read_data(seq_data) + seqstring, qualstring = format_as_fasta(seq_data['name'],seq,qual) + tmpfasta_fh.write(seqstring) + #seq, qual, anci = extract_read_info(seq_data, sff_fh.name) + #tmpfasta_fh.write(seq) + #print "done." + tmpfasta_fh.seek(0) + + if 0 : + # for debugging + tmpssaha_fname = 'sffe.tmp.'+str(pid)+'.ssaha2' + tmpssaha_fh = open(tmpssaha_fname, 'w+') + else: + tmpssaha_fh = tempfile.NamedTemporaryFile(prefix = 'sffealig_', + suffix = '.ssaha2') + + launch_ssaha(config['pelinker_fname'], tmpfasta_fh.name, tmpssaha_fh) + tmpfasta_fh.close() + + tmpssaha_fh.seek(0) + read_ssaha_data(tmpssaha_fh) + tmpssaha_fh.close() + + if debug: + tmpssaha_fh = open("sffe.tmp.10634.ssaha2", 'r') + read_ssaha_data(tmpssaha_fh) + + #print "Converting '" + sff_file + "' ... ", + sys.stdout.flush() + sff_fh = open(sff_file, 'rb') + #read_header(infile) + header_data = read_header(fileh=sff_fh) + + #now convert all reads + nseqs_sff = 0 + nseqs_out = 0 + for seq_data in sequences(fileh=sff_fh, header=header_data): + nseqs_sff += 1 + + seq, qual = clip_read(seq_data) + seqcheckstore.append(seq[0:50]) + + #if nseqs_sff >1000: + # check_for_dubious_startseq(seqcheckstore,sff_file,seq_data) + # sys.exit() + + if ssahapematches.has_key(seq_data['name']): + #print "Paired end:",seq_data['name'] + nseqs_out += split_paired_end(seq_data, sff_fh, seq_fh, qual_fh, xml_fh) + else: + #print "Normal:",seq_data['name'] + if config['pelinker_fname']: + seq_data['name'] = seq_data['name'] + ".fn" + write_unpaired_read(seq_data, sff_fh, seq_fh, qual_fh, xml_fh) + nseqs_out += 1 + #print "done." + #print 'Converted', str(nseqs_sff), 'reads into', str(nseqs_out), 'sequences.' + sff_fh.close() + + check_for_dubious_startseq(seqcheckstore,sff_file,seq_data) + seqcheckstore = ([]) + + xml_fh.write('</trace_volume>\n') + + xml_fh.close() + seq_fh.close() + if qual_fh is not None: + qual_fh.close() + + return + +def check_for_dubious_startseq(seqcheckstore, sffname,seqdata): + + global stern_warning + + foundproblem = "" + for checklen in range(1,len(seqcheckstore[0])): + foundinloop = False + seqdict = {} + for seq in seqcheckstore: + shortseq = seq[0:checklen] + if shortseq in seqdict: + seqdict[shortseq] += 1 + else: + seqdict[shortseq] = 1 + + for shortseq, count in seqdict.items(): + if float(count)/len(seqcheckstore) >= 0.5: + foundinloop = True + stern_warning + foundproblem = "\n"+"*" * 80 + foundproblem += "\nWARNING: " + foundproblem += "weird sequences in file " + sffname + "\n\n" + foundproblem += "After applying left clips, " + str(count) + " sequences (=" + foundproblem += '%.0f'%(100.0*float(count)/len(seqcheckstore)) + foundproblem += "%) start with these bases:\n" + shortseq + foundproblem += "\n\nThis does not look sane.\n\n" + foundproblem += "Countermeasures you *probably* must take:\n" + foundproblem += "1) Make your sequence provider aware of that problem and ask whether this can be\n corrected in the SFF.\n" + foundproblem += "2) If you decide that this is not normal and your sequence provider does not\n react, use the --min_left_clip of sff_extract.\n" + left,right = return_merged_clips(seqdata) + foundproblem += " (Probably '--min_left_clip="+ str(left+len(shortseq))+"' but you should cross-check that)\n" + foundproblem += "*" * 80 + "\n" + if not foundinloop : + break + if len(foundproblem): + print foundproblem + + +def parse_extra_info(info): + '''It parses the information that will go in the xml file. + + There are two formats accepted for the extra information: + key1:value1, key2:value2 + or: + file1.sff{key1:value1, key2:value2};file2.sff{key3:value3} + ''' + if not info: + return info + finfos = info.split(';') #information for each file + data_for_files = {} + for finfo in finfos: + #we split the file name from the rest + items = finfo.split('{') + if len(items) == 1: + fname = fake_sff_name + info = items[0] + else: + fname = items[0] + info = items[1] + #now we get each key,value pair in the info + info = info.replace('}', '') + data = {} + for item in info.split(','): + key, value = item.strip().split(':') + key = key.strip() + value = value.strip() + data[key] = value + data_for_files[fname] = data + return data_for_files + + +def return_merged_clips(data): + '''It returns the left and right positions to clip.''' + def max(a, b): + '''It returns the max of the two given numbers. + + It won't take into account the zero values. + ''' + if not a and not b: + return None + if not a: + return b + if not b: + return a + if a >= b: + return a + else: + return b + def min(a, b): + '''It returns the min of the two given numbers. + + It won't take into account the zero values. + ''' + if not a and not b: + return None + if not a: + return b + if not b: + return a + if a <= b: + return a + else: + return b + left = max(data['clip_adapter_left'], data['clip_qual_left']) + right = min(data['clip_adapter_right'], data['clip_qual_right']) + #maybe both clips where zero + if left is None: + left = 1 + if right is None: + right = data['number_of_bases'] + return left, right + +def sequence_case(data): + '''Given the data for one read it returns the seq with mixed case. + + The regions to be clipped will be lower case and the rest upper case. + ''' + left, right = return_merged_clips(data) + seq = data['bases'] + new_seq = ''.join((seq[:left-1].lower(), seq[left-1:right], seq[right:].lower())) + return new_seq + +def clip_read(data): + '''Given the data for one read it returns clipped seq and qual.''' + + qual = data['quality_scores'] + left, right = return_merged_clips(data) + seq = data['bases'] + qual = data['quality_scores'] + new_seq = seq[left-1:right] + new_qual = qual[left-1:right] + + return new_seq, new_qual + + + +def tests_for_ssaha(linker_fname): + '''Tests whether SSAHA2 can be successfully called.''' + + try: + print "Testing whether SSAHA2 is installed and can be launched ... ", + sys.stdout.flush() + fh = open('/dev/null', 'w') + retcode = subprocess.call(["ssaha2", "-v"], stdout = fh) + fh.close() + print "ok." + except : + print "nope? Uh oh ...\n\n" + raise RuntimeError('Could not launch ssaha2. Have you installed it? Is it in your path?') + + +def load_linker_sequences(linker_fname): + '''Loads all linker sequences into memory, storing only the length + of each linker.''' + + global linkerlengths + + if not os.path.getsize(linker_fname): + raise RuntimeError("File empty? '" + linker_fname + "'") + fh = open(linker_fname, 'r') + linkerseqs = read_fasta(fh) + if len(linkerseqs) == 0: + raise RuntimeError(linker_fname + ": no sequence found?") + for i in linkerseqs: + if linkerlengths.has_key(i.name): + raise RuntimeError(linker_fname + ": sequence '" + i.name + "' present multiple times. Aborting.") + linkerlengths[i.name] = len(i.sequence) + fh.close() + + +def launch_ssaha(linker_fname, query_fname, output_fh): + '''Launches SSAHA2 on the linker and query file, string SSAHA2 output + into the output filehandle''' + + try: + print "Searching linker sequences with SSAHA2 (this may take a while) ... ", + sys.stdout.flush() + retcode = subprocess.call(["ssaha2", "-output", "ssaha2", "-solexa", "-kmer", "4", "-skip", "1", linker_fname, query_fname], stdout = output_fh) + if retcode: + raise RuntimeError('Ups.') + else: + print "ok." + except: + print "\n" + raise RuntimeError('An error occured during the SSAHA2 execution, aborting.') + +def read_ssaha_data(ssahadata_fh): + '''Given file handle, reads file generated with SSAHA2 (with default + output format) and stores all matches as list ssahapematches + (ssaha paired-end matches) dictionary''' + + global ssahapematches + + print "Parsing SSAHA2 result file ... ", + sys.stdout.flush() + + for line in ssahadata_fh: + if line.startswith('ALIGNMENT'): + ml = line.split() + if len(ml) != 12 : + print "\n", line, + raise RuntimeError('Expected 12 elements in the SSAHA2 line with ALIGMENT keyword, but found ' + str(len(ml))) + if not ssahapematches.has_key(ml[2]) : + ssahapematches[ml[2]] = ([]) + if ml[8] == 'F': + #print line, + + # store everything except the first element (output + # format name (ALIGNMENT)) and the last element + # (length) + ssahapematches[ml[2]].append(ml[1:-1]) + else: + #print ml + ml[4],ml[5] = ml[5],ml[4] + #print ml + ssahapematches[ml[2]].append(ml[1:-1]) + + print "done." + + +########################################################################## +# +# BaCh: This block was shamelessly copied from +# http://python.genedrift.org/2007/07/04/reading-fasta-files-conclusion/ +# and then subsequently modified to read fasta correctly +# It's still not fool proof, but should be good enough +# +########################################################################## + +class Fasta: + def __init__(self, name, sequence): + self.name = name + self.sequence = sequence + +def read_fasta(file): + items = [] + aninstance = Fasta('', '') + linenum = 0 + for line in file: + linenum += 1 + if line.startswith(">"): + if len(aninstance.sequence): + items.append(aninstance) + aninstance = Fasta('', '') + # name == all characters until the first whitespace + # (split()[0]) but without the starting ">" ([1:]) + aninstance.name = line.split()[0][1:] + aninstance.sequence = '' + if len(aninstance.name) == 0: + raise RuntimeError(file.name + ': no name in line ' + str(linenum) + '?') + + else: + if len(aninstance.name) == 0: + raise RuntimeError(file.name + ': no sequence header at line ' + str(linenum) + '?') + aninstance.sequence += line.strip() + + if len(aninstance.name) and len(aninstance.sequence): + items.append(aninstance) + + return items +########################################################################## + +def version_string (): + return "sff_extract " + __version__ + +def read_config(): + '''It reads the configuration options from the command line arguments and + it returns a dict with them.''' + from optparse import OptionParser, OptionGroup + usage = "usage: %prog [options] sff1 sff2 ..." + desc = "Extract sequences from 454 SFF files into FASTA, FASTA quality"\ + " and XML traceinfo format. When a paired-end linker sequence"\ + " is given (-l), use SSAHA2 to scan the sequences for the linker,"\ + " then split the sequences, removing the linker." + parser = OptionParser(usage = usage, version = version_string(), description = desc) + parser.add_option('-a', '--append', action="store_true", dest='append', + help='append output to existing files', default=False) + parser.add_option('-i', '--xml_info', dest='xml_info', + help='extra info to write in the xml file') + parser.add_option("-l", "--linker_file", dest="pelinker_fname", + help="FASTA file with paired-end linker sequences", metavar="FILE") + + group = OptionGroup(parser, "File name options","") + group.add_option('-c', '--clip', action="store_true", dest='clip', + help='clip (completely remove) ends with low qual and/or adaptor sequence', default=False) + group.add_option('-u', '--upper_case', action="store_false", dest='mix_case', + help='all bases in upper case, including clipped ends', default=True) + group.add_option('', '--min_left_clip', dest='min_leftclip', + metavar="INTEGER", type = "int", + help='if the left clip coming from the SFF is smaller than this value, override it', default=0) + group.add_option('-Q', '--fastq', action="store_true", dest='want_fastq', + help='store as FASTQ file instead of FASTA + FASTA quality file', default=False) + parser.add_option_group(group) + + group = OptionGroup(parser, "File name options","") + group.add_option("-o", "--out_basename", dest="basename", + help="base name for all output files") + group.add_option("-s", "--seq_file", dest="seq_fname", + help="output sequence file name", metavar="FILE") + group.add_option("-q", "--qual_file", dest="qual_fname", + help="output quality file name", metavar="FILE") + group.add_option("-x", "--xml_file", dest="xml_fname", + help="output ancillary xml file name", metavar="FILE") + parser.add_option_group(group) + + #default fnames + #is there an sff file? + basename = 'reads' + if sys.argv[-1][-4:].lower() == '.sff': + basename = sys.argv[-1][:-4] + def_seq_fname = basename + '.fasta' + def_qual_fname = basename + '.fasta.qual' + def_xml_fname = basename + '.xml' + def_pelinker_fname = '' + parser.set_defaults(seq_fname = def_seq_fname) + parser.set_defaults(qual_fname = def_qual_fname) + parser.set_defaults(xml_fname = def_xml_fname) + parser.set_defaults(pelinker_fname = def_pelinker_fname) + + #we parse the cmd line + (options, args) = parser.parse_args() + + #we put the result in a dict + global config + config = {} + for property in dir(options): + if property[0] == '_' or property in ('ensure_value', 'read_file', + 'read_module'): + continue + config[property] = getattr(options, property) + + if config['basename'] is None: + config['basename']=basename + + #if we have not set a file name with -s, -q or -x we set the basename + #based file name + if config['want_fastq']: + config['qual_fname'] = '' + if config['seq_fname'] == def_seq_fname: + config['seq_fname'] = config['basename'] + '.fastq' + else: + if config['seq_fname'] == def_seq_fname: + config['seq_fname'] = config['basename'] + '.fasta' + if config['qual_fname'] == def_qual_fname: + config['qual_fname'] = config['basename'] + '.fasta.qual' + + if config['xml_fname'] == def_xml_fname: + config['xml_fname'] = config['basename'] + '.xml' + + #we parse the extra info for the xml file + config['xml_info'] = parse_extra_info(config['xml_info']) + return config, args + + + +########################################################################## + + +def testsome(): + sys.exit() + return + + +def debug(): + try: + dummy = 1 + #debug() + #testsome() + + config, args = read_config() + load_linker_sequences(config['pelinker_fname']) + + #pid = os.getpid() + pid = 15603 + + #tmpfasta_fname = 'sffe.tmp.'+ str(pid)+'.fasta' + #tmpfasta_fh = open(tmpfasta_fname, 'w') + tmpfasta_fname = 'FLVI58L05.fa' + tmpfasta_fh = open(tmpfasta_fname, 'r') + + tmpssaha_fname = 'sffe.tmp.'+str(pid)+'.ssaha2' + tmpssaha_fh = open(tmpssaha_fname, 'w') + + launch_ssaha(config['pelinker_fname'], tmpfasta_fh.name, tmpssaha_fh) + + tmpssaha_fh = open("sffe.tmp.15603.ssaha2", 'r') + read_ssaha_data(tmpssaha_fh) + + sys.exit() + + extract_reads_from_sff(config, args) + + except (OSError, IOError, RuntimeError), errval: + print errval + sys.exit() + + sys.exit() + + +def main(): + + argv = sys.argv + if len(argv) == 1: + sys.argv.append('-h') + read_config() + sys.exit() + try: + #debug(); + + config, args = read_config() + + if config['pelinker_fname']: + #tests_for_ssaha(config['pelinker_fname']) + load_linker_sequences(config['pelinker_fname']) + if len(args) == 0: + raise RuntimeError("No SFF file given?") + extract_reads_from_sff(config, args) + except (OSError, IOError, RuntimeError), errval: + print errval + return 1 + + if stern_warning: + return 1 + + return 0 + + + +if __name__ == "__main__": + sys.exit(main()) diff -r ebfc9236bf5a -r 61b09dc1dff2 tools/filters/sff_extractor.xml --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tools/filters/sff_extractor.xml Wed Apr 07 11:12:00 2010 -0400 @@ -0,0 +1,22 @@ +<tool id="Sff_extractor" name="SFF converter" version="1.0.0"> + <description></description> + <command interpreter="python">sff_extract.py -s $out_file1 -q $out_file2 -x $out_file3 $input</command> + <inputs> + <param format="sff" name="input" type="data" label="Extract from this dataset"/> + </inputs> + <outputs> + <data format="fasta" name="out_file1" /> + <data format="qual" name="out_file2" /> + <data format="xml" name="out_file3" /> + </outputs> + <help> +**What it does** + +This tool extracts data from the 454 Sequencer SFF format and creates three files containing the: + Sequences (FASTA), + Qualities (QUAL) and + Clippings (XML) + </help> +</tool> + +