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#!/usr/bin/env python
"""Unit tests for FASTA and related parsers.
"""
from cogent.parse.fasta import FastaParser, MinimalFastaParser, \
NcbiFastaLabelParser, NcbiFastaParser, RichLabel, LabelParser, GroupFastaParser
from cogent.core.sequence import DnaSequence, Sequence, ProteinSequence as Protein
from cogent.core.info import Info
from cogent.parse.record import RecordError
from cogent.util.unit_test import TestCase, main
__author__ = "Rob Knight"
__copyright__ = "Copyright 2007-2009, The Cogent Project"
__credits__ = ["Rob Knight"]
__license__ = "GPL"
__version__ = "1.4.1"
__maintainer__ = "Rob Knight"
__email__ = "rob@spot.colorado.edu"
__status__ = "Production"
def Dna(seq, *args, **kwargs):
seq = seq.replace('u','t')
seq = seq.replace('U','T')
d = DnaSequence(seq, *args, **kwargs)
return d
class GenericFastaTest(TestCase):
"""Setup data for all the various FASTA parsers."""
def setUp(self):
"""standard files"""
self.labels = '>abc\n>def\n>ghi\n'.split('\n')
self.oneseq = '>abc\nUCAG\n'.split('\n')
self.multiline = '>xyz\nUUUU\nCC\nAAAAA\nG'.split('\n')
self.threeseq='>123\na\n> \t abc \t \ncag\ngac\n>456\nc\ng'.split('\n')
self.twogood='>123\n\n> \t abc \t \ncag\ngac\n>456\nc\ng'.split('\n')
self.oneX='>123\nX\n> \t abc \t \ncag\ngac\n>456\nc\ng'.split('\n')
self.nolabels = 'GJ>DSJGSJDF\nSFHKLDFS>jkfs\n'.split('\n')
self.empty = []
class MinimalFastaParserTests(GenericFastaTest):
"""Tests of MinimalFastaParser: returns (label, seq) tuples."""
def test_empty(self):
"""MinimalFastaParser should return empty list from 'file' w/o labels"""
self.assertEqual(list(MinimalFastaParser(self.empty)), [])
self.assertEqual(list(MinimalFastaParser(self.nolabels, strict=False)),
[])
self.assertRaises(RecordError, list, MinimalFastaParser(self.nolabels))
def test_no_labels(self):
"""MinimalFastaParser should return empty list from file w/o seqs"""
#should fail if strict (the default)
self.assertRaises(RecordError, list,
MinimalFastaParser(self.labels,strict=True))
#if not strict, should skip the records
self.assertEqual(list(MinimalFastaParser(self.labels, strict=False)),
[])
def test_single(self):
"""MinimalFastaParser should read single record as (label, seq) tuple"""
f = list(MinimalFastaParser(self.oneseq))
self.assertEqual(len(f), 1)
a = f[0]
self.assertEqual(a, ('abc', 'UCAG'))
f = list(MinimalFastaParser(self.multiline))
self.assertEqual(len(f), 1)
a = f[0]
self.assertEqual(a, ('xyz', 'UUUUCCAAAAAG'))
def test_multiple(self):
"""MinimalFastaParser should read multiline records correctly"""
f = list(MinimalFastaParser(self.threeseq))
self.assertEqual(len(f), 3)
a, b, c = f
self.assertEqual(a, ('123', 'a'))
self.assertEqual(b, ('abc', 'caggac'))
self.assertEqual(c, ('456', 'cg'))
def test_multiple_bad(self):
"""MinimalFastaParser should complain or skip bad records"""
self.assertRaises(RecordError, list, MinimalFastaParser(self.twogood))
f = list(MinimalFastaParser(self.twogood, strict=False))
self.assertEqual(len(f), 2)
a, b = f
self.assertEqual(a, ('abc', 'caggac'))
self.assertEqual(b, ('456', 'cg'))
class FastaParserTests(GenericFastaTest):
"""Tests of FastaParser: returns sequence objects."""
def test_empty(self):
"""FastaParser should return empty list from 'file' w/o labels"""
self.assertEqual(list(FastaParser(self.empty)), [])
self.assertEqual(list(FastaParser(self.nolabels, strict=False)),
[])
self.assertRaises(RecordError, list, FastaParser(self.nolabels))
def test_no_labels(self):
"""FastaParser should return empty list from file w/o seqs"""
#should fail if strict (the default)
self.assertRaises(RecordError, list,
FastaParser(self.labels,strict=True))
#if not strict, should skip the records
self.assertEqual(list(FastaParser(self.labels, strict=False)), [])
def test_single(self):
"""FastaParser should read single record as seq object"""
f = list(FastaParser(self.oneseq))
self.assertEqual(len(f), 1)
a = f[0]
self.assertEqual(a, ('abc', 'UCAG'))
self.assertEqual(a[1].Name, 'abc')
f = list(FastaParser(self.multiline))
self.assertEqual(len(f), 1)
a = f[0]
self.assertEqual(a, ('xyz', 'UUUUCCAAAAAG'))
self.assertEqual(a[1].Name, 'xyz')
def test_single_constructor(self):
"""FastaParser should use constructors if supplied"""
f = list(FastaParser(self.oneseq, Dna))
self.assertEqual(len(f), 1)
a = f[0]
self.assertEqual(a, ('abc', 'TCAG'))
self.assertEqual(a[1].Name, 'abc')
def upper_abc(x):
return None, {'ABC': x.upper()}
f = list(FastaParser(self.multiline, Dna, upper_abc))
self.assertEqual(len(f), 1)
a = f[0]
self.assertEqual(a, (None, 'TTTTCCAAAAAG'))
self.assertEqual(a[1].Name, None)
self.assertEqual(a[1].Info.ABC, 'XYZ')
def test_multiple(self):
"""FastaParser should read multiline records correctly"""
f = list(FastaParser(self.threeseq))
self.assertEqual(len(f), 3)
for i in f:
assert isinstance(i[1], Sequence)
a, b, c = f
self.assertEqual((a[1].Name, a[1]), ('123', 'a'))
self.assertEqual((b[1].Name, b[1]), ('abc', 'caggac'))
self.assertEqual((c[1].Name, c[1]), ('456', 'cg'))
def test_multiple_bad(self):
"""Parser should complain or skip bad records"""
self.assertRaises(RecordError, list, FastaParser(self.twogood))
f = list(FastaParser(self.twogood, strict=False))
self.assertEqual(len(f), 2)
a, b = f
a, b = a[1], b[1] #field 0 is name
self.assertEqual((a.Name, a), ('abc', 'caggac'))
self.assertEqual((b.Name, b), ('456', 'cg'))
def test_multiple_constructor_bad(self):
"""Parser should complain or skip bad records w/ constructor"""
def dnastrict(x, **kwargs):
try:
return Dna(x, check=True, **kwargs)
except Exception, e:
raise RecordError, "Could not convert sequence"
self.assertRaises(RecordError, list, FastaParser(self.oneX, dnastrict))
f = list(FastaParser(self.oneX, dnastrict, strict=False))
self.assertEqual(len(f), 2)
a, b = f
a, b = a[1], b[1]
self.assertEqual((a.Name, a), ('abc', 'caggac'.upper()))
self.assertEqual((b.Name, b), ('456', 'cg'.upper()))
class NcbiFastaLabelParserTests(TestCase):
"""Tests of the label line parser for NCBI's FASTA identifiers."""
def test_init(self):
"""Labels from genpept.fsa should work as expected"""
i = NcbiFastaLabelParser(
'>gi|37549575|ref|XP_352503.1| similar to EST gb|ATTS1136')[1]
self.assertEqual(i.GI, ['37549575'])
self.assertEqual(i.RefSeq, ['XP_352503.1'])
self.assertEqual(i.Description, 'similar to EST gb|ATTS1136')
i = NcbiFastaLabelParser(
'>gi|32398734|emb|CAD98694.1| (BX538350) dbj|baa86974.1, possible')[1]
self.assertEqual(i.GI, ['32398734'])
self.assertEqual(i.RefSeq, [])
self.assertEqual(i.EMBL, ['CAD98694.1'])
self.assertEqual(i.Description, '(BX538350) dbj|baa86974.1, possible')
i = NcbiFastaLabelParser(
'>gi|10177064|dbj|BAB10506.1| (AB005238) ')[1]
self.assertEqual(i.GI, ['10177064'])
self.assertEqual(i.DDBJ, ['BAB10506.1'])
self.assertEqual(i.Description, '(AB005238)')
class NcbiFastaParserTests(TestCase):
"""Tests of the NcbiFastaParser."""
def setUp(self):
"""Define a few standard files"""
self.peptide = [
'>gi|10047090|ref|NP_055147.1| small muscle protein, X-linked [Homo sapiens]',
'MNMSKQPVSNVRAIQANINIPMGAFRPGAGQPPRRKECTPEVEEGVPPTSDEEKKPIPGAKKLPGPAVNL',
'SEIQNIKSELKYVPKAEQ',
'>gi|10047092|ref|NP_037391.1| neuronal protein [Homo sapiens]',
'MANRGPSYGLSREVQEKIEQKYDADLENKLVDWIILQCAEDIEHPPPGRAHFQKWLMDGTVLCKLINSLY',
'PPGQEPIPKISESKMAFKQMEQISQFLKAAETYGVRTTDIFQTVDLWEGKDMAAVQRTLMALGSVAVTKD'
]
self.nasty = [
' ', #0 ignore leading blank line
'>gi|abc|ref|def|', #1 no description -- ok
'UCAG', #2 single line of sequence
'#comment', #3 comment -- skip
' \t ', #4 ignore blank line between records
'>gi|xyz|gb|qwe| \tdescr \t\t', #5 desciption has whitespace
'UUUU', #6 two lines of sequence
'CCCC', #7
'>gi|bad|ref|nonsense', #8 missing last pipe -- error
'ACU', #9
'>gi|bad|description', #10 not enough fields -- error
'AAA', #11
'>gi|bad|ref|stuff|label', #12
'XYZ', #13 bad sequence -- error
'>gi|bad|gb|ignore| description', #14 label without sequence -- error
'> gi | 123 | dbj | 456 | desc|with|pipes| ',#15 label w/ whitespace -- OK
'ucag', #16
' \t ', #17 ignore blank line inside record
'UCAG', #18
'tgac', #19 lowercase should be OK
'# comment', #20 comment -- skip
'NNNN', #21 degenerates should be OK
' ', #22 ignore trailing blank line
]
self.empty = []
self.no_label = ['ucag']
def test_empty(self):
"""NcbiFastaParser should accept empty input"""
self.assertEqual(list(NcbiFastaParser(self.empty)), [])
self.assertEqual(list(NcbiFastaParser(self.empty, Protein)), [])
def test_normal(self):
"""NcbiFastaParser should accept normal record if loose or strict"""
f = list(NcbiFastaParser(self.peptide, Protein))
self.assertEqual(len(f), 2)
a, b = f
a, b = a[1], b[1] #field 0 is the name
self.assertEqual(a, 'MNMSKQPVSNVRAIQANINIPMGAFRPGAGQPPRRKECTPEVEEGVPPTSDEEKKPIPGAKKLPGPAVNLSEIQNIKSELKYVPKAEQ')
self.assertEqual(a.Info.GI, ['10047090'])
self.assertEqual(a.Info.RefSeq, ['NP_055147.1'])
self.assertEqual(a.Info.DDBJ, [])
self.assertEqual(a.Info.Description,
'small muscle protein, X-linked [Homo sapiens]')
self.assertEqual(b, 'MANRGPSYGLSREVQEKIEQKYDADLENKLVDWIILQCAEDIEHPPPGRAHFQKWLMDGTVLCKLINSLYPPGQEPIPKISESKMAFKQMEQISQFLKAAETYGVRTTDIFQTVDLWEGKDMAAVQRTLMALGSVAVTKD')
self.assertEqual(b.Info.GI, ['10047092'])
self.assertEqual(b.Info.RefSeq, ['NP_037391.1'])
self.assertEqual(b.Info.Description, 'neuronal protein [Homo sapiens]')
def test_bad(self):
"""NcbiFastaParser should raise error on bad records if strict"""
#if strict, starting anywhere in the first 15 lines should cause errors
for i in range(15):
self.assertRaises(RecordError,list,NcbiFastaParser(self.nasty[i:]))
#...but the 16th is OK.
r = list(NcbiFastaParser(self.nasty[15:]))[0]
self.assertEqual(r, ('123', 'ucagUCAGtgacNNNN'))
#test that we get what we expect if not strict
r = list(NcbiFastaParser(self.nasty, Sequence, strict=False))
self.assertEqual(len(r), 4)
a, b, c, d = r
self.assertEqual((a[1], a[1].Info.GI, a[1].Info.RefSeq, \
a[1].Info.Description),
('UCAG', ['abc'], ['def'], ''))
self.assertEqual((b[1], b[1].Info.GI, b[1].Info.GenBank, \
b[1].Info.Description),
('UUUUCCCC', ['xyz'], ['qwe'], 'descr'))
self.assertEqual((c[1], c[1].Info.GI, c[1].Info.RefSeq, \
c[1].Info.Description),
('XYZ', ['bad'], ['stuff'], 'label'))
self.assertEqual((d[1], d[1].Info.GI, d[1].Info.DDBJ, \
d[1].Info.Description),
('ucagUCAGtgacNNNN'.upper(), ['123'], ['456'], 'desc|with|pipes|'))
#...and when we explicitly supply a constructor
r = list(NcbiFastaParser(self.nasty, Dna, strict=False))
self.assertEqual(len(r), 3)
a, b, c = r
a, b, c = a[1], b[1], c[1]
self.assertEqual((a, a.Info.GI, a.Info.RefSeq, a.Info.Description),
('TCAG', ['abc'], ['def'], ''))
self.assertEqual((b, b.Info.GI, b.Info.GenBank, b.Info.Description),
('TTTTCCCC', ['xyz'], ['qwe'], 'descr'))
self.assertEqual((c, c.Info.GI, c.Info.DDBJ, c.Info.Description),
('tcagTCAGtgacNNNN'.upper(), ['123'], ['456'], 'desc|with|pipes|'))
class LabelParsingTest(TestCase):
"""Test generic fasta label parsing"""
def test_rich_label(self):
"""rich label correctly constructs label strings"""
# labels should be equal based on the result of applying their
# attributes to their string template
k = RichLabel(Info(species="rat"), "%(species)s")
l = RichLabel(Info(species="rat", seq_id="xy5"), "%(species)s")
self.assertEqual(k, l)
# labels should construct from Info components correctly
k = RichLabel(Info(species="rat", seq_id="xy5"),
"%(seq_id)s:%(species)s")
self.assertEqual(k, "xy5:rat")
k = RichLabel(Info(species="rat", seq_id="xy5"),
"%(species)s:%(seq_id)s")
self.assertEqual(k, "rat:xy5")
# extra components should be ignored
k = RichLabel(Info(species="rat", seq_id="xy5"), "%(species)s")
self.assertEqual(k, "rat")
# the label should have Info object
self.assertEqual(k.Info.species, "rat")
self.assertEqual(k.Info.seq_id, "xy5")
# label should be constructable just like a normal string
self.assertEqual(RichLabel('a'), 'a')
def test_label_parser(self):
"""label parser factory function cope with mixed structure labels"""
# the label parser factory function should correctly handle label lines
# with mixed separators
make = LabelParser("%(species)s:%(accession)s",
[[0,"accession", str],
[2, "species", str]],
split_with=": ")
for label, expect in [(">abcd:human:misc", "misc:abcd"),
("abcd:human:misc", "misc:abcd"),
(">abcd:Human misc", "misc:abcd"),
(">abcd Human:misc", "misc:abcd"),
(">abcd:Human misc", "misc:abcd")]:
self.assertEqual(make(label), expect)
# should raise an assertion error if template doesn't match at least one field name
self.assertRaises(AssertionError, LabelParser, "%s:%s",
[[0,"accession", str],
[2, "species", str]],
split_with=": ")
class GroupFastaParsingTest(TestCase):
"""test parsing of grouped sequences in a collection"""
def test_groups(self):
"""correctly yield grouped sequences from fasta formatted data"""
data = [">group1:seq1_id:species1",
"ACTG",
">group1:seq2_id:species2",
"ACTG",
">group2:seq3_id:species1",
"ACGT",
">group2:seq4_id:species2",
"ACGT"]
expected = [{"species1": "ACTG", "species2":"ACTG"},
{"species1":"ACGT", "species2":"ACGT"}]
label_to_name = LabelParser("%(species)s", [(0,"Group",str),
(1,"seq_id",str),(2,"species",str)], split_with=":")
parser = GroupFastaParser(data, label_to_name, aligned=True)
count = 0
for group in parser:
got = group.todict()
want = expected[count]
self.assertEqual(got, want)
self.assertEqual(group.Info.Group, "group%s" % (count+1))
count += 1
# check we don't return a done group
done_groups = ["group1"]
parser = GroupFastaParser(data, label_to_name, done_groups=done_groups,
aligned=True)
for group in parser:
got = group.todict()
want = expected[1]
self.assertEqual(got, want)
self.assertEqual(group.Info.Group, "group2")
if __name__ == '__main__':
main()
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