def splitFromContigs(self, contigs, max_contig=50000, cut_size=20000):
# type: (ContigStorage, int, int) -> None
for contig in contigs.unique():
if not basic.isCanonocal(contig.id):
contig = contig.rc
if len(contig) > max_contig:
line1 = self.addNew(contig.seq[:cut_size],
"L" + contig.id + "l")
line2 = self.addNew(contig.seq[-cut_size:],
"L" + contig.id + "r")
line1.initial.add(
AlignmentPiece.Identical(
contig.asSegment().prefix(length=cut_size),
line1.asSegment()))
line2.initial.add(
AlignmentPiece.Identical(
contig.asSegment().suffix(length=cut_size),
line2.asSegment()))
line1.tie(line2,
len(contig) - 2 * cut_size,
contig.seq[cut_size:-cut_size])
else:
line = self.addNew(contig.seq, "L" + contig.id)
line.initial.add(
AlignmentPiece.Identical(contig.asSegment(),
line.asSegment()))
def splitLine(self, seg):
# type: (Segment) -> Tuple[NewLine, NewLine]
sys.stdout.trace("Line operation Split", seg)
line = seg.contig # type: NewLine
seg1 = line.asSegment().prefix(pos=seg.right)
line1 = self.addNew(seg1.Seq(), line.id + "l")
seg2 = line.asSegment().suffix(pos=seg.left)
line2 = self.addNew(seg2.Seq(), line.id + "r")
al1 = AlignmentPiece.Identical(seg1, line1.asSegment())
al2 = AlignmentPiece.Identical(seg2, line2.asSegment())
line1.initial.addAll([
al.embed(al1)
for al in line.initial.allInter(seg1, params.min_alignment_size)
])
line2.initial.addAll([
al.embed(al2)
for al in line.initial.allInter(seg2, params.min_alignment_size)
])
line1.correct_segments.addAll(
line.correct_segments.cap(seg=seg1, min_inter=params.k).map(al1))
line2.correct_segments.addAll(
line.correct_segments.cap(seg=seg2, min_inter=params.k).map(al2))
line1.completely_resolved.addAll(
line.completely_resolved.cap(
seg=seg1,
min_inter=params.k).map(al1).filterBySize(min=params.k))
line2.completely_resolved.addAll(
line.completely_resolved.cap(
seg=seg2,
min_inter=params.k).map(al2).filterBySize(min=params.k))
line1.disjointig_alignments.addAll([
al.embed(al1)
for al in line.disjointig_alignments.allInter(seg1, params.k)
])
line2.disjointig_alignments.addAll([
al.embed(al2)
for al in line.disjointig_alignments.allInter(seg2, params.k)
])
for al in line.read_alignments:
if al.seg_to.interSize(seg1) > params.k:
line1.addReadAlignment(al.embed(al1))
for al in line.read_alignments:
if al.seg_to.interSize(seg2) > params.k:
line2.addReadAlignment(al.embed(al2))
line.cleanReadAlignments()
self.notifySplitLine(al1, al2)
self.remove(line)
if line.knot is not None:
line2.tie(line.knot.line_right, line.knot.gap, line.knot.gap_seq)
if line.rc.knot is not None:
line1.rc.tie(line.rc.knot.line_right, line.rc.knot.gap,
line.rc.knot.gap_seq)
return line1, line2
def polishSmallSegment(self, seg, als):
# type: (Segment, List[AlignmentPiece]) -> AlignmentPiece
ok = False
for al in als:
if al.seg_to.contains(seg):
ok = True
if not ok:
sys.stdout.log(common.log_params.LogPriority.warning, "Warning",
seg, "has no covering reads")
return AlignmentPiece.Identical(seg.asContig().asSegment(), seg)
reads = []
start = basic.randomSequence(200)
end = basic.randomSequence(200)
for al in als:
new_seq = ""
al = al.reduce(target=seg)
if al.seg_to.left < seg.left + 20:
new_seq += start
new_seq += al.seg_from.Seq()
if al.seg_to.right > seg.right - 20:
new_seq += end
reads.append(NamedSequence(new_seq, al.seg_from.contig.id))
base = Contig(start + seg.Seq() + end, "base")
polished = None
try:
polished = Contig(self.polish(reads, base), "polished")
except PolishException:
sys.stdout.log(
common.log_params.LogPriority.warning, "Warning", seg,
"has a sequence very different from reads. Using reads to correct."
)
for al, read in zip(als, reads):
if al.seg_to.contains(seg):
try:
polished = Contig(
self.polish(reads, Contig(read.seq, read.id)),
"polished")
break
except PolishException:
pass
if polished is None:
sys.stdout.log(
common.log_params.LogPriority.warning, "Warning", seg,
"could not be corrected even though some reads cover it.")
polished = seg.asContig()
als = list(self.aligner.overlapAlign([polished],
ContigStorage([base])))
for al in als:
if al.seg_from.left < 10 and al.rc.seg_from.left < 10:
mapping = AlignmentPiece.Identical(
base.segment(len(start),
len(base) - len(end)), seg)
return al.compose(mapping)
assert False, "No alignment from polished to base: " + str(als)
def testManual(self):
contig1 = Contig("ACGTTAAACGT", "from")
contig2 = Contig("ACGTTTAACGT", "to")
al = AlignmentPiece.Identical(contig1.asSegment(), contig2.asSegment())
al1 = self.scorer.polyshAlignment(al,
params.alignment_correction_radius)
assert al1.cigar == "4M1D2M1I4M", str(al1.asMatchingStrings())
contig1 = Contig("ACATGATCACT", "from")
contig2 = Contig("ACGTGAAACGT", "to")
al = AlignmentPiece.Identical(contig1.asSegment(), contig2.asSegment())
al1 = self.scorer.polyshAlignment(al,
params.alignment_correction_radius)
assert al1.cigar == "6M1I3M1D1M", str(al1.asMatchingStrings())
def test3(self):
lines = NewLineStorage(DisjointigCollection(), self.aligner)
line = lines.addNew("ACGTACGTACGT", "c")
dp = LineDotPlot(lines, self.aligner)
al1 = AlignmentPiece.Identical(line.segment(0, 8), line.segment(4, 12))
al2 = AlignmentPiece.Identical(line.segment(0, 4), line.segment(8, 12))
dp.addAlignment(al1)
dp.addAlignment(al2)
alignment = AlignmentPiece.Identical(
Contig("TCC", "tmp").asSegment(), line.segment(3, 6))
line.correctSequence([alignment])
assert str(
list(dp.auto_alignments["c"])
) == "[(c[1:12-4]->c[5:12-0]:0.86), (c[0:4]->c[8:12-0]:1.000), (c[5:12-0]->c[1:12-4]:0.86), (c[8:12-0]->c[0:4]:1.000), (c[0:12-0]->c[0:12-0]:1.000)]"
def test1(self):
lines = NewLineStorage(DisjointigCollection(), self.aligner)
line1 = lines.addNew("ACGTAAAAGGGTACGT", "c1")
line2 = lines.addNew("ACGTAAGGGGGTACGT", "c2")
al = self.scorer.polyshAlignment(
AlignmentPiece.Identical(line1.asSegment(), line2.asSegment()),
params.alignment_correction_radius)
dp = LineDotPlot(lines, self.aligner)
dp.addAlignment(al)
alignment = AlignmentPiece.Identical(
Contig("AGG", "tmp").asSegment(), line2.segment(0, 3))
line2.correctSequence([alignment])
assert str(list(dp.alignmentsToFrom[line2.id][
line1.id])) == "[(c1[0:16-0]->c2[0:16-0]:0.81)]"
def testManual(self):
contig1 = Contig("ACGTACGTACGT", "c1")
contig2 = Contig("ACGTAGGTACGT", "c2")
contig3 = Contig("ACTTACGTACGT", "c3")
al1 = AlignmentPiece.Identical(contig1.asSegment(),
contig2.asSegment())
al2 = AlignmentPiece.Identical(contig2.asSegment(),
contig3.asSegment())
al3 = al1.compose(al2)
assert al3.__repr__() == "(c1[0:12-0]->c3[0:12-0]:0.92)"
assert al3.cigar == "12M"
al4 = al1.reverse()
al5 = al4.composeTargetDifference(al2)
assert al5.__repr__() == "(c1[0:12-0]->c3[0:12-0]:0.92)"
assert al5.cigar == "12M"
def __iter__(self):
# type: () -> Generator[AlignmentPiece]
for al in self.content:
yield al
for al in self.content:
yield al.reverse()
yield AlignmentPiece.Identical(self.line.asSegment())
def LoadLineCollection(dir, lc_file, aligner, contigs, disjointigs, reads, polisher):
# type: (str, str, Aligner, ContigStorage, DisjointigCollection, ReadCollection, Polisher) -> NewLineStorage
sys.stdout.info("Initializing lines from init file", lc_file)
lines = NewLineStorage(disjointigs, aligner)
f = TokenReader(open(lc_file, "r"))
n = f.readInt()
for i in range(n):
id = f.readToken()
contig = contigs[id]
assert contig.id == id
line = lines.addNew(contig.seq, contig.id)
read_ids = f.readTokens()
for al in aligner.overlapAlign([reads[rid] for rid in read_ids], ContigStorage([line])):
if len(al.seg_to) >= min(params.k, len(line) - 100):
tmp_line = al.seg_to.contig # type: NewLine
tmp_line.addReadAlignment(al)
if len(line) < params.k + 200:
new_contig, new_als = polisher.polishEnd(list(line.read_alignments), max_extension=params.k + 100 - len(line))
line.extendRight(new_contig.suffix(pos=len(line)).Seq(), new_als)
line.correct_segments.add(line.asSegment().shrink(100))
line.completely_resolved.add(line.asSegment().shrink(100))
line.initial.add(AlignmentPiece.Identical(line.asSegment().asContig().asSegment(), line.asSegment()))
sys.stdout.trace("Final list of lines:")
for line in lines.unique():
sys.stdout.trace(line, line.completely_resolved)
lines.writeToFasta(open(os.path.join(dir, "initial_lines.fasta"), "w"))
lines.alignDisjointigs()
sys.stdout.info("Constructing line dot plot")
return lines
def testManual(self):
contig1 = Contig("ACGTACGTACGT", "from")
contig2 = Contig("ACGTACGTACGT", "to")
al1 = AlignmentPiece.Identical(contig1.segment(0, 4),
contig2.segment(0, 4))
al2 = AlignmentPiece.Identical(contig1.segment(0, 4),
contig2.segment(4, 8))
al3 = AlignmentPiece.Identical(contig1.segment(4, 8),
contig2.segment(8, 12))
storage = AlignmentStorage()
storage.addAll([al1, al2, al3])
assert str(
list(storage)
) == "[(from[0:4]->to[0:4]:1.000), (from[0:4]->to[4:12-4]:1.000), (from[4:12-4]->to[8:12-0]:1.000)]"
assert str(
list(storage.rc)
) == "[(-from[4:12-4]->-to[0:4]:1.000), (-from[8:12-0]->-to[4:12-4]:1.000), (-from[8:12-0]->-to[8:12-0]:1.000)]"
assert str(list(storage.calculateCoverage())) == "[(to[0:12-0], 1)]"
assert str(list(storage.filterByCoverage(0, 1))) == "[]"
assert str(list(storage.filterByCoverage(1, 2))) == "[to[0:12-0]]"
assert str(list(storage.filterByCoverage(2))) == "[]"
storage.addAndMergeRight(al3)
assert str(
list(storage)
) == "[(from[0:4]->to[0:4]:1.000), (from[0:4]->to[4:12-4]:1.000), (from[4:12-4]->to[8:12-0]:1.000)]"
al4 = AlignmentPiece.Identical(contig1.segment(2, 8),
contig2.segment(2, 8))
al5 = AlignmentPiece.Identical(contig1.segment(4, 10),
contig2.segment(4, 10))
storage.addAll([al4, al5])
assert str(
list(storage.calculateCoverage())
) == "[(to[0:2], 1), (to[2:4], 2), (to[4:12-4], 3), (to[8:12-2], 2), (to[10:12-0], 1)]"
assert str(list(storage.filterByCoverage(
2, 3))) == "[to[2:4], to[8:12-2]]"
assert str(list(storage.filterByCoverage(2))) == "[to[2:12-2]]"
assert str(
list(storage.getAlignmentsTo(contig2.segment(2, 3)))
) == "[(from[0:4]->to[0:4]:1.000), (from[2:12-4]->to[2:12-4]:1.000)]"
assert str(list(storage.getAlignmentsTo(contig2.segment(
2, 6)))) == "[(from[2:12-4]->to[2:12-4]:1.000)]"
def testManual(self):
contig1 = Contig("ACGTAAAAGGGTACGT", "c1")
contig2 = Contig("ACGTAAGGGGGTACGT", "c2")
al = self.scorer.polyshAlignment(
AlignmentPiece.Identical(contig1.segment(5, 12),
contig2.segment(5, 12)),
params.alignment_correction_radius)
corr = Correction(contig1, contig2, [al])
assert corr.mapPositionsUp(range(len(contig2))) == [
0, 1, 2, 3, 4, 5, 8, 9, 9, 9, 10, 11, 12, 13, 14, 15
]
assert corr.mapPositionsDown(range(len(contig1))) == [
0, 1, 2, 3, 4, 5, 6, 6, 6, 9, 10, 11, 12, 13, 14, 15
]
al2 = AlignmentPiece.Identical(contig2.segment(0, 4))
al3 = AlignmentPiece.Identical(contig2.segment(6, 8))
al4 = AlignmentPiece.Identical(contig2.segment(6, 16))
al5 = AlignmentPiece.Identical(contig2.segment(7, 16))
assert str(
corr.composeQueryDifferences([al2, al3, al4, al5])
) == "[(c2[0:4]->c1[0:4]:1.000), (c2[6:7]->c1[8:9]:1.000), (c2[6:16-0]->c1[8:16-0]:0.80), (c2[9:16-0]->c1[9:16-0]:1.000)]"
def LoadLineCollection(dir, lc_file, aligner, contigs, disjointigs, reads,
polisher):
# type: (str, str, Aligner, ContigStorage, DisjointigCollection, ReadCollection, Polisher) -> NewLineStorage
sys.stdout.info("Initializing lines from init file", lc_file)
lines = NewLineStorage(disjointigs, aligner)
f = TokenReader(open(lc_file, "r"))
n = f.readInt()
for i in range(n):
id = f.readToken()
contig = contigs[id]
assert contig.id == id
line = lines.addNew(contig.seq, contig.id)
read_ids = f.readTokens()
als = []
line_reads = [reads[rid] for rid in read_ids]
if len(line_reads) == 0:
sys.stdout.warn("No read alignments in initialization for line",
line.id, "Realigning all reads")
line_reads = reads
for al in aligner.overlapAlign(line_reads, ContigStorage([line])):
if len(al.seg_to) >= min(1500, len(line) - 100):
als.append(al)
als = sorted(als,
key=lambda al: (al.seg_from.contig.id, -int(
al.percentIdentity() * 100), -len(al)))
for key, read_als in itertools.groupby(
als, key=lambda al: al.seg_from.contig.id):
al = list(read_als)[0]
tmp_line = al.seg_to.contig # type: NewLine
tmp_line.addReadAlignment(al)
correct_seg = line.asSegment().shrink(100)
if len(line) < params.k + 200:
new_contig, new_als = polisher.polishEnd(
list(line.read_alignments),
max_extension=params.k + 100 - len(line))
line.extendRight(new_contig.suffix(pos=len(line)).Seq(), new_als)
if len(correct_seg) < params.k:
correct_seg = correct_seg.expandRight(params.k -
len(correct_seg))
line.correct_segments.add(correct_seg)
line.completely_resolved.add(correct_seg)
line.initial.add(
AlignmentPiece.Identical(line.asSegment().asContig().asSegment(),
line.asSegment()))
sys.stdout.trace("Final list of lines:")
for line in lines.unique():
sys.stdout.trace(line, line.completely_resolved)
lines.writeToFasta(open(os.path.join(dir, "initial_lines.fasta"), "w"))
lines.alignDisjointigs()
sys.stdout.info("Constructing line dot plot")
return lines
def test5(self):
dataset = TestDataset("abcABC")
name1 = dataset.addContig("abc")
name2 = dataset.addContig("ABC")
lines, dp, reads = dataset.genAll(self.aligner)
line = lines[name1]
sa = dataset.alphabet["a"].seq
sb = dataset.alphabet["b"].seq
tmp = Contig(
sa +
"ACGACAGTAACTTGAACGACAGTAACTTGAACGACAGTAACTTGAACGACAGTAACTTGAACGACAGTAACTTGAACGACAGTAACTTGAACGACAGTAACTTGA"
+ sb, "tmp")
al1 = AlignmentPiece.Identical(tmp.prefix(len=len(sa)),
line.prefix(len=len(sa)))
al2 = AlignmentPiece.Identical(
tmp.asSegment().suffix(length=len(sb)),
line.segment(len(sa),
len(sa) + len(sb)))
al = AlignmentPiece.MergeFittingAlignments([al1, al2])
line.correctSequence([al])
assert str(
list(dp.allInter(line.asSegment()))
) == "[(C0_abc[0:1755-0]->C0_abc[0:1755-0]:1.000), (C1_ABC[0:1652-0]->C0_abc[0:1755-0]:0.94)]"
def loadLine(self, handler, disjointigs, reads, contigs):
# type: (TokenReader, DisjointigCollection, ReadCollection, ContigCollection) -> None
self.id = handler.readToken()
self.seq = handler.readToken()
self.rc.id = basic.Reverse(self.id)
n = handler.readInt()
for i in range(n):
handler.readToken()
handler.readToken()
handler.readToken()
seg = Segment.load(handler, self)
handler.readToken()
self.initial.add(AlignmentPiece.Identical(seg.asContig().asSegment(), seg))
# self.add(AlignmentPiece.load(handler, collection_from, collection_to))
self.correct_segments.load(handler, self)
self.completely_resolved.load(handler, self)
self.disjointig_alignments.load(handler, disjointigs, self)
self.read_alignments.load(handler, reads, self)
for al in self.read_alignments:
read = al.seg_from.contig #type: AlignedRead
read.addAlignment(al)
self.max_extension = False
def genAll(self, aligner):
# type: (Aligner) -> Tuple[NewLineStorage, LineDotPlot, ReadCollection]
disjointigs = DisjointigCollection()
for dis in self.disjointigs:
disjointigs.addNew(dis.seq, dis.id)
from disjointig_resolve.line_storage import NewLineStorage
lines = NewLineStorage(disjointigs, aligner)
lines.name_printer = lambda line: line.id + "_" + self.translateBack(
line, aligner)
for line in self.contigs:
new_line = lines.addNew(line.seq, line.id)
new_line.initial.add(
AlignmentPiece.Identical(
new_line.asSegment().asContig().asSegment(),
new_line.asSegment()))
dp = LineDotPlot(lines, aligner)
dp.construct(aligner)
lines.alignDisjointigs()
reads = ReadCollection()
for read in self.reads:
reads.addNewRead(read)
disjointigs.addAlignments(aligner.localAlign(reads, disjointigs))
return lines, dp, reads
def mergeLines(self, alignment, k):
# type: (AlignmentPiece, int) -> NewLine
sys.stdout.trace("Line operation Merge", alignment.seg_from.contig,
alignment.seg_to.contig, alignment)
line1 = alignment.seg_from.contig #type: NewLine
line2 = alignment.seg_to.contig #type: NewLine
assert line1 != line2
if len(alignment) < k + 100:
sys.stdout.trace(
"Prolonging line to ensure alignment of at least k")
seg = line2.segment(
alignment.seg_to.right,
alignment.seg_to.right + k + 100 - len(alignment))
line1.extendRight(seg.Seq())
alignment = alignment.mergeDistant(
AlignmentPiece.Identical(
line1.asSegment().suffix(length=len(seg)), seg))
# Cutting hanging tips of both lines
al_storage = AlignmentStorage()
al_storage.add(alignment)
storage = TwoLineAlignmentStorage(line1, line2)
line2.addListener(storage)
line1.addListener(storage.reverse)
storage.add(alignment)
if alignment.seg_from.right < len(line1):
line1.cutRight(alignment.seg_from.right)
sys.stdout.trace("Cut right")
sys.stdout.trace(list(storage.content)[0])
sys.stdout.trace("\n".join(
list(storage.content)[0].asMatchingStrings()))
sys.stdout.trace(list(storage.content)[0].cigar)
if alignment.seg_to.left > 0:
line2.rc.cutRight(len(line2) - alignment.seg_to.left)
sys.stdout.trace("Cut left")
sys.stdout.trace(list(storage.content)[0])
sys.stdout.trace("\n".join(
list(storage.content)[0].asMatchingStrings()))
sys.stdout.trace(list(storage.content)[0].cigar)
alignment = list(storage.content)[0] # type: AlignmentPiece
line2.removeListener(storage)
line1.removeListener(storage.reverse)
# Making sure line sequences match on the overlap
if alignment.seg_from.left > 0:
new_seq = Contig(
line1.asSegment().prefix(pos=alignment.seg_from.left).Seq() +
line2.seq, "new_seq")
else:
new_seq = Contig(line2.seq, "new_seq")
al2 = AlignmentPiece.Identical(
line2.asSegment(),
new_seq.asSegment().suffix(length=len(line2)))
sys.stdout.trace("Al2:", al2)
alignment = alignment.compose(al2).reverse()
sys.stdout.trace("Composed alignment", alignment)
sys.stdout.trace("\n".join(alignment.asMatchingStrings()))
sys.stdout.trace(alignment.cigar)
assert alignment.seg_to.right == len(line1)
assert alignment.seg_from.left == al2.seg_to.left
line1.correctSequence([alignment])
# Now lines have exact match
name = "(" + ",".join(
basic.parseLineName(line1.id) +
basic.parseLineName(line2.id)) + ")"
line = self.addNew(new_seq.seq, name)
assert line.seq.startswith(line1.seq)
assert line.seq.endswith(line2.seq)
al1 = AlignmentPiece.Identical(
line1.asSegment(),
line.asSegment().prefix(length=len(line1)))
al2 = AlignmentPiece.Identical(
line2.asSegment(),
line.asSegment().suffix(length=len(line2)))
line.initial.addAll(
line1.initial.targetAsSegment(al1.seg_to).merge(
line2.initial.targetAsSegment(al2.seg_to)))
line.correct_segments.addAll(
line1.correct_segments.contigAsSegment(al1.seg_to).merge(
line2.correct_segments.contigAsSegment(al2.seg_to)))
line.completely_resolved.addAll(
line1.completely_resolved.contigAsSegment(al1.seg_to).merge(
line2.completely_resolved.contigAsSegment(al2.seg_to), k))
line.disjointig_alignments.addAll(
line1.disjointig_alignments.targetAsSegment(al1.seg_to).merge(
line2.disjointig_alignments.targetAsSegment(al2.seg_to)))
for al in line1.read_alignments.targetAsSegment(al1.seg_to).merge(
line2.read_alignments.targetAsSegment(al2.seg_to)):
line.addReadAlignment(al)
line1.cleanReadAlignments()
line2.cleanReadAlignments()
self.notifyMergedLines(al1, al2)
knot_right = line2.knot
knot_left = line1.rc.knot
self.remove(line1)
self.remove(line2)
if knot_right is not None:
if knot_right.line_right == line1:
line.tie(line, knot_right.gap, knot_right.gap_seq)
else:
line.tie(knot_right.line_right, knot_right.gap,
knot_right.gap_seq)
if knot_left is not None and knot_left.line_right != line2.rc:
line.rc.tie(knot_left.line_right, knot_left.gap, knot_left.gap_seq)
return line
def polishEnd(self, als, min_cov=4, min_cov_frac=0.7, max_extension=None):
# type: (List[AlignmentPiece], int, int, int) -> Tuple[Contig, List[AlignmentPiece]]
if max_extension is None:
max_extension = 10000000000
scorer = Scorer()
contig = als[0].seg_to.contig
max_len = max_extension + len(contig)
sys.stdout.trace("Polishing end of", als[0].seg_to.contig)
new_contig = contig.asSegment().asContig()
relevant_als = [
al.changeTargetContig(new_contig) for al in als
if al.rc.seg_to.left < 100
]
finished_als = []
while True:
tmp = []
for al in relevant_als:
if al.seg_to.inter(new_contig.asSegment().suffix(
length=100)) and al.rc.seg_from.left > 100:
tmp.append(al)
else:
finished_als.append(al)
relevant_als = tmp
if len(relevant_als) < min_cov:
break
start = "ACGTTCGA" + basic.randomSequence(
params.flanking_size) + new_contig.asSegment().suffix(
length=min(params.flanking_size, len(new_contig))).Seq()
reduced_read_list = [
AlignedRead.new(
start + al.seg_from.contig.asSegment().suffix(
pos=al.seg_from.right).Seq(),
str(i) + "_" + al.seg_from.contig.id)
for i, al in enumerate(relevant_als)
]
reduced_reads = ReadCollection(reduced_read_list)
found = False
for base_al in relevant_als:
if base_al.rc.seg_from.left < params.flanking_size:
continue
# Base consists 500 random nucleotides and 500 last nucls from the polished sequence a segment of read of length at most 500
base_segment = base_al.seg_from.contig.segment(
base_al.seg_from.right,
min(
len(base_al.seg_from.contig), base_al.seg_from.right +
max(params.window_size, params.k)))
base = Contig(start + base_segment.Seq(), "base")
for read in reduced_read_list:
read.clean()
polished_base = Contig(self.polish(reduced_reads, base),
"polished_base")
for al in self.aligner.localAlign(
reduced_reads,
ContigStorage().addAll([polished_base])):
reduced_reads.reads[al.seg_from.contig.id].addAlignment(al)
candidate_alignments = []
for read in reduced_read_list:
candidate_alignments.append(None)
for al in read.alignmentsTo(polished_base.asSegment()):
if al.seg_to.left == 0 and (
(candidate_alignments[-1] is None
or candidate_alignments[-1].seg_to.right <
al.seg_to.right)):
candidate_alignments[-1] = al
trimmedAlignments = []
for i, al in enumerate(candidate_alignments):
assert al is not None, reduced_read_list[i]
trimmedAlignments.append(al.trimByQuality(0.4, 100))
contra_index = 0
contra = []
support = len(trimmedAlignments)
cutoff_pos = len(start)
for al in sorted(trimmedAlignments,
key=lambda al: al.seg_to.right):
while contra_index < len(contra) and contra[
contra_index].seg_to.right < al.seg_to.right - 50:
contra_index += 1
if support >= min_cov and len(contra) - contra_index <= (
1 - min_cov_frac) * support:
cutoff_pos = al.seg_to.right
support -= 1
if al.contradictingRTCRight():
contra.append(al)
else:
sys.stdout.trace("Stopped at:", support, contra_index,
(1 - min_cov_frac) * support)
break
sys.stdout.trace("Positions:",
[al.seg_to.right for al in trimmedAlignments])
sys.stdout.trace("Contra:", contra)
if cutoff_pos > len(start) + 100:
sys.stdout.trace("Chose to use read", base_al.__repr__(),
"Extended for", cutoff_pos - len(start),
"Alignments:")
sys.stdout.trace(map(str, reduced_read_list))
found = True
new_contig_candidate = Contig(
new_contig.seq + polished_base[len(start):cutoff_pos],
"candidate")
embedding = AlignmentPiece.Identical(
polished_base.segment(len(start), cutoff_pos),
new_contig_candidate.asSegment().suffix(
pos=len(new_contig)))
read_mappings = []
for al1, al2 in zip(candidate_alignments, relevant_als):
seg_from = al2.seg_from.contig.asSegment().suffix(
length=len(al1.seg_from.contig) - len(start))
seg_to = al1.seg_from.contig.asSegment().suffix(
length=len(al1.seg_from.contig) - len(start))
read_mappings.append(
AlignmentPiece.Identical(seg_from, seg_to))
embedded_alignments = []
for al1, al2 in zip(candidate_alignments, read_mappings):
if al1.seg_to.right <= len(start) + 10:
embedded_alignments.append(None)
else:
tmp = al2.compose(al1)
if tmp.seg_to.left > embedding.seg_from.right - 10:
embedded_alignments.append(None)
else:
embedded_alignments.append(
tmp.compose(embedding))
corrected_relevant_alignments = [
al.targetAsSegment(
new_contig_candidate.asSegment().prefix(
len(new_contig))) for al in relevant_als
]
relevant_als = []
for al1, al2 in zip(corrected_relevant_alignments,
embedded_alignments):
if al2 is None:
al = al1
else:
al = al1.mergeDistant(al2)
if al is None:
al = al1
elif al1.seg_from.dist(
al2.seg_from) >= 10 or al1.seg_to.dist(
al2.seg_to) >= 10:
al = scorer.polyshAlignment(
al, params.alignment_correction_radius)
relevant_als.append(al)
finished_als = [
al.targetAsSegment(
new_contig_candidate.asSegment().prefix(
len(new_contig))) for al in finished_als
]
new_contig = new_contig_candidate
break
else:
sys.stdout.trace("Could not prolong with read", base_al,
"Alignments:")
sys.stdout.trace(map(str, reduced_read_list))
if len(new_contig) >= max_len:
break
if not found:
break
return new_contig, relevant_als + finished_als
def fillFromContigs(self, contigs):
# type: (Iterable[Contig]) -> None
for contig in UniqueList(contigs):
line = self.addNew(contig.seq, "L" + contig.id)
line.initial.add(
AlignmentPiece.Identical(contig.asSegment(), line.asSegment()))
