コード例 #1
0
ファイル: gafparser.py プロジェクト: biolink/ontobio
def to_association(gaf_line: List[str], report=None, group="unknown", dataset="unknown", qualifier_parser=assocparser.Qualifier2_1(), bio_entities=None) -> assocparser.ParseResult:
    report = Report(group=group, dataset=dataset) if report is None else report
    bio_entities = collections.BioEntities(dict()) if bio_entities is None else bio_entities
    source_line = "\t".join(gaf_line)

    if source_line == "":
        report.error(source_line, "Blank Line", "EMPTY", "Blank lines are not allowed", rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    if len(gaf_line) > 17:
        # If we see more than 17 columns, we will just cut off the columns after column 17
        report.warning(source_line, assocparser.Report.WRONG_NUMBER_OF_COLUMNS, "",
            msg="There were more than 17 columns in this line. Proceeding by cutting off extra columns after column 17.",
            rule=1)
        gaf_line = gaf_line[:17]

    if 17 > len(gaf_line) >= 15:
        gaf_line += [""] * (17 - len(gaf_line))

    if len(gaf_line) != 17:
        report.error(source_line, assocparser.Report.WRONG_NUMBER_OF_COLUMNS, "",
            msg="There were {columns} columns found in this line, and there should be 15 (for GAF v1) or 17 (for GAF v2)".format(columns=len(gaf_line)), rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    ## check for missing columns
    ## We use indeces here because we run GO RULES before we split the vals into individual variables
    DB_INDEX = 0
    DB_OBJECT_INDEX = 1
    TAXON_INDEX = 12
    REFERENCE_INDEX = 5
    if gaf_line[DB_INDEX] == "":
        report.error(source_line, Report.INVALID_IDSPACE, "EMPTY", "col1 is empty", taxon=gaf_line[TAXON_INDEX], rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gaf_line[DB_OBJECT_INDEX] == "":
        report.error(source_line, Report.INVALID_ID, "EMPTY", "col2 is empty", taxon=gaf_line[TAXON_INDEX], rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gaf_line[REFERENCE_INDEX] == "":
        report.error(source_line, Report.INVALID_ID, "EMPTY", "reference column 6 is empty", taxon=gaf_line[TAXON_INDEX], rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    parsed_taxons_result = gaf_line_validators["taxon"].validate(gaf_line[TAXON_INDEX])  # type: assocparser.ValidateResult
    if not parsed_taxons_result.valid:
        report.error(source_line, Report.INVALID_TAXON, parsed_taxons_result.original, parsed_taxons_result.message, taxon=parsed_taxons_result.original, rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    taxon = parsed_taxons_result.parsed[0]

    date = assocparser.parse_date(gaf_line[13], report, source_line)
    if date is None:
        return assocparser.ParseResult(source_line, [], True, report=report)

    interacting_taxon = parsed_taxons_result.parsed[1] if len(parsed_taxons_result.parsed) == 2 else None
    subject_curie = association.Curie(gaf_line[0], gaf_line[1])
    subject = association.Subject(subject_curie, gaf_line[2], [gaf_line[9]], gaf_line[10].split("|"), [association.map_gp_type_label_to_curie(gaf_line[11])], taxon)
    gpi_entity = bio_entities.get(subject_curie)
    if gpi_entity is not None and subject != gpi_entity:
        subject = gpi_entity

    # column 4 is qualifiers -> index 3
    # For allowed, see http://geneontology.org/docs/go-annotations/#annotation-qualifiers
    # We use the below validate to check validaty if qualifiers, not as much to *parse* them into the GoAssociation object.
    # For GoAssociation we will use the above qualifiers list. This is fine because the above does not include `NOT`, etc
    # This is confusing, and we can fix later on by consolidating qualifier and relation in GoAssociation.
    parsed_qualifiers = qualifier_parser.validate(gaf_line[3])
    if not parsed_qualifiers.valid:
        report.error(source_line, Report.INVALID_QUALIFIER, parsed_qualifiers.original, parsed_qualifiers.message, taxon=gaf_line[TAXON_INDEX], rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    aspect = gaf_line[8]
    negated, relation_label, qualifiers = assocparser._parse_qualifier(gaf_line[3], aspect)
    # Note: Relation label is grabbed from qualifiers, if any exist in _parse_qualifier
    qualifiers = [association.Curie.from_str(curie_util.contract_uri(relations.lookup_label(q), strict=False)[0]) for q in qualifiers]

    object = association.Term(association.Curie.from_str(gaf_line[4]), taxon)
    if isinstance(object, association.Error):
        report.error(source_line, Report.INVALID_SYMBOL, gaf_line[4], "Problem parsing GO Term", taxon=gaf_line[TAXON_INDEX], rule=1)

    # References
    references = [association.Curie.from_str(e) for e in gaf_line[5].split("|") if e]
    for r in references:
        if isinstance(r, association.Error):
            report.error(source_line, Report.INVALID_SYMBOL, gaf_line[5], "Problem parsing references", taxon=gaf_line[TAXON_INDEX], rule=1)
            return assocparser.ParseResult(source_line, [], True, report=report)

    gorefs = [ref for ref in references if ref.namespace == "GO_REF"] + [None]
    eco_curie = ecomap.coderef_to_ecoclass(gaf_line[6], reference=gorefs[0])
    if eco_curie is None:
        report.error(source_line, Report.UNKNOWN_EVIDENCE_CLASS, gaf_line[6], msg="Expecting a known ECO GAF code, e.g ISS", rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    withfroms = association.ConjunctiveSet.str_to_conjunctions(gaf_line[7])
    if isinstance(withfroms, association.Error):
        report.error(source_line, Report.INVALID_SYMBOL, gaf_line[7], "Problem parsing with/from", taxon=gaf_line[TAXON_INDEX], rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    evidence_type = association.Curie.from_str(eco_curie)
    if isinstance(evidence_type, association.Error):
        report.error(source_line, Report.INVALID_SYMBOL, gaf_line[6], "Problem parsing evidence type", taxon=gaf_line[TAXON_INDEX], rule=1)

    evidence = association.Evidence(association.Curie.from_str(eco_curie), references, withfroms)
    if any([isinstance(e, association.Error) for e in evidence.has_supporting_reference]):
        first_error = [e for e in evidence.has_supporting_reference if isinstance(e, association.Error)][0]
        report.error(source_line, Report.INVALID_SYMBOL, gaf_line[5], first_error.info, taxon=str(taxon), rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    subject_extensions = []
    if gaf_line[16]:
        subject_filler = association.Curie.from_str(gaf_line[16])
        if isinstance(subject_filler, association.Error):
            report.error(source_line, assocparser.Report.INVALID_ID, gaf_line[16], subject_filler.info, taxon=str(taxon), rule=1)
            return assocparser.ParseResult(source_line, [], True, report=report)
        # filler is not an Error, so keep moving
        subject_extensions.append(association.ExtensionUnit(association.Curie.from_str("rdfs:subClassOf"), subject_filler))

    conjunctions = []
    if gaf_line[15]:
        conjunctions = association.ConjunctiveSet.str_to_conjunctions(
            gaf_line[15],
            conjunct_element_builder=lambda el: association.ExtensionUnit.from_str(el))

        if isinstance(conjunctions, association.Error):
            report.error(source_line, Report.EXTENSION_SYNTAX_ERROR, conjunctions.info, "extensions should be relation(curie) and relation should have corresponding URI", taxon=str(taxon), rule=1)
            return assocparser.ParseResult(source_line, [], True, report=report)

    relation_uri = relations.lookup_label(relation_label)
    if relation_uri is None:
        report.error(source_line, assocparser.Report.INVALID_QUALIFIER, relation_label, "Could not find CURIE for relation `{}`".format(relation_label), taxon=str(taxon), rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    # We don't have to check that this is well formed because we're grabbing it from the known relations URI map.
    relation_curie = association.Curie.from_str(curie_util.contract_uri(relation_uri)[0])

    a = association.GoAssociation(
        source_line="\t".join(gaf_line),
        subject=subject,
        relation=relation_curie,
        object=object,
        negated=negated,
        qualifiers=qualifiers,
        aspect=aspect,
        interacting_taxon=interacting_taxon,
        evidence=evidence,
        subject_extensions=subject_extensions,
        object_extensions=conjunctions,
        provided_by=gaf_line[14],
        date=date,
        properties={})

    return assocparser.ParseResult(source_line, [a], False, report=report)
コード例 #2
0
ファイル: gpadparser.py プロジェクト: meftaul/ontobio
def to_association(gpad_line: List[str],
                   report=None,
                   group="unknown",
                   dataset="unknown") -> assocparser.ParseResult:

    report = Report(group=group, dataset=dataset) if report is None else report

    source_line = "\t".join(gpad_line)

    if len(gpad_line) > 12:
        report.warning(
            source_line,
            assocparser.Report.WRONG_NUMBER_OF_COLUMNS,
            "",
            msg=
            "There were more than 12 columns in this line. Proceeding by cutting off extra columns.",
            rule=1)

        gpad_line = gpad_line[:12]

    if 12 > len(gpad_line) >= 10:
        gpad_line += [""] * (12 - len(gpad_line))

    if len(gpad_line) != 12:
        report.error(
            source_line,
            assocparser.Report.WRONG_NUMBER_OF_COLUMNS,
            "",
            msg=
            "There were {columns} columns found in this line, and there should be between 10 and 12"
            .format(columns=len(gpad_line)))
        return assocparser.ParseResult(source_line, [], True, report=report)

    ## check for missing columns
    ## We use indeces here because we run GO RULES before we split the vals into individual variables
    DB_INDEX = 0
    DB_OBJECT_INDEX = 1
    QUALIFIER = 2
    REFERENCE_INDEX = 4
    EVIDENCE_INDEX = 5
    if gpad_line[DB_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_IDSPACE,
                     "EMPTY",
                     "col1 is empty",
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gpad_line[DB_OBJECT_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_ID,
                     "EMPTY",
                     "col2 is empty",
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gpad_line[QUALIFIER] == "":
        report.error(source_line,
                     Report.INVALID_TAXON,
                     "EMPTY",
                     "qualifier column is empty",
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gpad_line[REFERENCE_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_ID,
                     "EMPTY",
                     "reference column is empty",
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gpad_line[EVIDENCE_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_ID,
                     "EMPTY",
                     "Evidence column is empty",
                     rule=1)

    taxon = ""
    subject_curie = "{db}:{id}".format(db=gpad_line[0], id=gpad_line[1])
    subject = association.Subject(subject_curie, "", "", [], "", "")
    object = association.Term(gpad_line[3], "")
    evidence = association.Evidence(gpad_line[5],
                                    [e for e in gpad_line[4].split("|") if e],
                                    [e for e in gpad_line[6].split("|") if e])

    raw_qs = gpad_line[2].split("|")
    negated = "NOT" in raw_qs
    looked_up_qualifiers = [
        relations.lookup_label(q) for q in raw_qs if q != "NOT"
    ]
    if None in looked_up_qualifiers:
        report.error(source_line,
                     Report.INVALID_QUALIFIER,
                     raw_qs,
                     "Could not find a URI for qualifier",
                     taxon=taxon,
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    qualifiers = [curie_util.contract_uri(q)[0] for q in looked_up_qualifiers]

    conjunctions = []
    if gpad_line[11]:
        for conjuncts in gpad_line[11].split("|"):
            extension_units = []
            for u in conjuncts.split(","):
                parsed = relation_tuple.findall(u)
                if len(parsed) == 1:
                    rel, term = parsed[0]
                    extension_units.append(association.ExtensionUnit(
                        rel, term))
                else:
                    # Otherwise, something went bad with the regex, and it's a bad parse
                    report.error(source_line,
                                 Report.EXTENSION_SYNTAX_ERROR,
                                 u,
                                 "extensions should be relation(curie)",
                                 taxon=taxon,
                                 rule=1)
                    return assocparser.ParseResult(source_line, [],
                                                   True,
                                                   report=report)

            conjunction = association.ExtensionConjunctions(extension_units)
            conjunctions.append(conjunction)
    object_extensions = association.ExtensionExpression(conjunctions)

    properties_list = [
        prop.split("=") for prop in gpad_line[11].split("|") if prop
    ]
    # print(properties_list)
    a = association.GoAssociation(
        source_line="\t".join(gpad_line),
        subject=subject,
        relation="",
        object=object,
        negated=negated,
        qualifiers=qualifiers,
        aspect=None,
        interacting_taxon=gpad_line[7],
        evidence=evidence,
        subject_extensions=[],
        object_extensions=object_extensions,
        provided_by=gpad_line[9],
        date=gpad_line[8],
        properties={prop[0]: prop[1]
                    for prop in properties_list if prop})

    return assocparser.ParseResult(source_line, [a], False, report=report)
コード例 #3
0
ファイル: gafparser.py プロジェクト: robertdigital/ontobio
def to_association(gaf_line: List[str],
                   report=None,
                   group="unknown",
                   dataset="unknown") -> assocparser.ParseResult:
    report = Report(group=group, dataset=dataset) if report is None else report
    source_line = "\t".join(gaf_line)

    if source_line == "":
        report.error(source_line,
                     "Blank Line",
                     "EMPTY",
                     "Blank lines are not allowed",
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    if len(gaf_line) > 17:
        # If we see more than 17 columns, we will just cut off the columns after column 17
        report.warning(
            source_line,
            assocparser.Report.WRONG_NUMBER_OF_COLUMNS,
            "",
            msg=
            "There were more than 17 columns in this line. Proceeding by cutting off extra columns after column 17.",
            rule=1)
        gaf_line = gaf_line[:17]

    if 17 > len(gaf_line) >= 15:
        gaf_line += [""] * (17 - len(gaf_line))

    if len(gaf_line) != 17:
        report.error(
            source_line,
            assocparser.Report.WRONG_NUMBER_OF_COLUMNS,
            "",
            msg=
            "There were {columns} columns found in this line, and there should be 15 (for GAF v1) or 17 (for GAF v2)"
            .format(columns=len(gaf_line)),
            rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    ## check for missing columns
    ## We use indeces here because we run GO RULES before we split the vals into individual variables
    DB_INDEX = 0
    DB_OBJECT_INDEX = 1
    TAXON_INDEX = 12
    REFERENCE_INDEX = 5
    if gaf_line[DB_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_IDSPACE,
                     "EMPTY",
                     "col1 is empty",
                     taxon=gaf_line[TAXON_INDEX],
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gaf_line[DB_OBJECT_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_ID,
                     "EMPTY",
                     "col2 is empty",
                     taxon=gaf_line[TAXON_INDEX],
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gaf_line[TAXON_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_TAXON,
                     "EMPTY",
                     "taxon column is empty",
                     taxon=gaf_line[TAXON_INDEX],
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gaf_line[REFERENCE_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_ID,
                     "EMPTY",
                     "reference column 6 is empty",
                     taxon=gaf_line[TAXON_INDEX],
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    taxon = gaf_line[12].split("|")
    taxon_curie = taxon[0].replace("taxon", "NCBITaxon")
    interacting_taxon = taxon[1].replace(
        "taxon", "NCBITaxon") if len(taxon) == 2 else None
    subject_curie = "{db}:{id}".format(db=gaf_line[0], id=gaf_line[1])
    subject = association.Subject(subject_curie, gaf_line[2], gaf_line[9],
                                  gaf_line[10].split("|"), gaf_line[11],
                                  taxon_curie)
    aspect = gaf_line[8]
    negated, relation, qualifiers = assocparser._parse_qualifier(
        gaf_line[3], aspect)

    # For allowed, see http://geneontology.org/docs/go-annotations/#annotation-qualifiers
    for q in qualifiers:

        if q not in allowed_qualifiers:
            report.error(
                source_line,
                Report.INVALID_QUALIFIER,
                q,
                "Qualifiers must be `contributes_to`, `colocalizes_with`, or `NOT`",
                taxon=gaf_line[TAXON_INDEX],
                rule=1)
            return assocparser.ParseResult(source_line, [],
                                           True,
                                           report=report)

    object = association.Term(gaf_line[4], taxon_curie)
    evidence = association.Evidence(ecomap.coderef_to_ecoclass(gaf_line[6]),
                                    [e for e in gaf_line[5].split("|") if e],
                                    [e for e in gaf_line[7].split("|") if e])
    subject_extensions = [
        association.ExtensionUnit("rdfs:subClassOf", gaf_line[16])
    ] if gaf_line[16] else []

    conjunctions = []
    if gaf_line[15]:
        for conjuncts in gaf_line[15].split("|"):
            extension_units = []
            for u in conjuncts.split(","):
                parsed = relation_tuple.findall(u)
                if len(parsed) == 1:
                    rel, term = parsed[0]
                    extension_units.append(association.ExtensionUnit(
                        rel, term))
                else:
                    # Otherwise, something went bad with the regex, and it's a bad parse
                    report.error(source_line,
                                 Report.EXTENSION_SYNTAX_ERROR,
                                 u,
                                 "extensions should be relation(curie)",
                                 taxon=taxon,
                                 rule=1)
                    return assocparser.ParseResult(source_line, [],
                                                   True,
                                                   report=report)

            conjunction = association.ExtensionConjunctions(extension_units)
            conjunctions.append(conjunction)
    object_extensions = association.ExtensionExpression(conjunctions)
    looked_up_rel = relations.lookup_label(relation)
    if looked_up_rel is None:
        report.error(
            source_line,
            assocparser.Report.INVALID_QUALIFIER,
            relation,
            "Qualifer must be \"colocalizes_with\", \"contributes_to\", or \"NOT\"",
            taxon=taxon,
            rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    a = association.GoAssociation(
        source_line="\t".join(gaf_line),
        subject=subject,
        relation=curie_util.contract_uri(looked_up_rel)[0],
        object=object,
        negated=negated,
        qualifiers=qualifiers,
        aspect=aspect,
        interacting_taxon=interacting_taxon,
        evidence=evidence,
        subject_extensions=subject_extensions,
        object_extensions=object_extensions,
        provided_by=gaf_line[14],
        date=gaf_line[13],
        properties={})

    return assocparser.ParseResult(source_line, [a], False, report=report)
コード例 #4
0
ファイル: gafparser.py プロジェクト: valearna/ontobio
def to_association(
    gaf_line: List[str],
    report=None,
    group="unknown",
    dataset="unknown",
    qualifier_parser=Qualifier2_1()) -> assocparser.ParseResult:
    report = Report(group=group, dataset=dataset) if report is None else report
    source_line = "\t".join(gaf_line)

    if source_line == "":
        report.error(source_line,
                     "Blank Line",
                     "EMPTY",
                     "Blank lines are not allowed",
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    if len(gaf_line) > 17:
        # If we see more than 17 columns, we will just cut off the columns after column 17
        report.warning(
            source_line,
            assocparser.Report.WRONG_NUMBER_OF_COLUMNS,
            "",
            msg=
            "There were more than 17 columns in this line. Proceeding by cutting off extra columns after column 17.",
            rule=1)
        gaf_line = gaf_line[:17]

    if 17 > len(gaf_line) >= 15:
        gaf_line += [""] * (17 - len(gaf_line))

    if len(gaf_line) != 17:
        report.error(
            source_line,
            assocparser.Report.WRONG_NUMBER_OF_COLUMNS,
            "",
            msg=
            "There were {columns} columns found in this line, and there should be 15 (for GAF v1) or 17 (for GAF v2)"
            .format(columns=len(gaf_line)),
            rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    ## check for missing columns
    ## We use indeces here because we run GO RULES before we split the vals into individual variables
    DB_INDEX = 0
    DB_OBJECT_INDEX = 1
    TAXON_INDEX = 12
    REFERENCE_INDEX = 5
    if gaf_line[DB_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_IDSPACE,
                     "EMPTY",
                     "col1 is empty",
                     taxon=gaf_line[TAXON_INDEX],
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gaf_line[DB_OBJECT_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_ID,
                     "EMPTY",
                     "col2 is empty",
                     taxon=gaf_line[TAXON_INDEX],
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gaf_line[TAXON_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_TAXON,
                     "EMPTY",
                     "taxon column is empty",
                     taxon=gaf_line[TAXON_INDEX],
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)
    if gaf_line[REFERENCE_INDEX] == "":
        report.error(source_line,
                     Report.INVALID_ID,
                     "EMPTY",
                     "reference column 6 is empty",
                     taxon=gaf_line[TAXON_INDEX],
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    taxon = gaf_line[12].split("|")
    taxon_curie = taxon[0].replace("taxon", "NCBITaxon")
    date = assocparser._normalize_gaf_date(gaf_line[13], report, taxon_curie,
                                           source_line)
    if date is None:
        return assocparser.ParseResult(source_line, [], True, report=report)

    interacting_taxon = taxon[1].replace(
        "taxon", "NCBITaxon") if len(taxon) == 2 else None
    subject_curie = "{db}:{id}".format(db=gaf_line[0], id=gaf_line[1])
    subject = association.Subject(subject_curie, gaf_line[2], gaf_line[9],
                                  gaf_line[10].split("|"), gaf_line[11],
                                  taxon_curie)
    aspect = gaf_line[8]
    negated, relation, qualifiers = assocparser._parse_qualifier(
        gaf_line[3], aspect)

    # column 4 is qualifiers -> index 3
    # For allowed, see http://geneontology.org/docs/go-annotations/#annotation-qualifiers
    parsed_qualifiers = qualifier_parser.validate(gaf_line[3])
    if not parsed_qualifiers.valid:
        report.error(source_line,
                     Report.INVALID_QUALIFIER,
                     parsed_qualifiers.original,
                     parsed_qualifiers.message,
                     taxon=gaf_line[TAXON_INDEX],
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    object = association.Term(gaf_line[4], taxon_curie)
    evidence = association.Evidence(
        ecomap.coderef_to_ecoclass(gaf_line[6]),
        [e for e in gaf_line[5].split("|") if e],
        association.ConjunctiveSet.str_to_conjunctions(gaf_line[7]))

    subject_extensions = [
        association.ExtensionUnit("rdfs:subClassOf", gaf_line[16])
    ] if gaf_line[16] else []

    conjunctions = []
    if gaf_line[15]:
        conjunctions = association.ConjunctiveSet.str_to_conjunctions(
            gaf_line[15],
            conjunct_element_builder=lambda el: association.ExtensionUnit.
            from_str(el))

        if isinstance(conjunctions, association.Error):
            report.error(source_line,
                         Report.EXTENSION_SYNTAX_ERROR,
                         conjunctions.info,
                         "extensions should be relation(curie)",
                         taxon=taxon,
                         rule=1)
            return assocparser.ParseResult(source_line, [],
                                           True,
                                           report=report)

    looked_up_rel = relations.lookup_label(relation)
    if looked_up_rel is None:
        report.error(source_line,
                     assocparser.Report.INVALID_QUALIFIER,
                     relation,
                     "Could not find CURIE for relation `{}`".format(relation),
                     taxon=taxon,
                     rule=1)
        return assocparser.ParseResult(source_line, [], True, report=report)

    a = association.GoAssociation(
        source_line="\t".join(gaf_line),
        subject=subject,
        relation=curie_util.contract_uri(looked_up_rel)[0],
        object=object,
        negated=negated,
        qualifiers=qualifiers,
        aspect=aspect,
        interacting_taxon=interacting_taxon,
        evidence=evidence,
        subject_extensions=subject_extensions,
        object_extensions=conjunctions,
        provided_by=gaf_line[14],
        date=date,
        properties={})

    return assocparser.ParseResult(source_line, [a], False, report=report)