Bio::SeqIO embl
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Summary
Bio::SeqIO::embl - EMBL sequence input/output stream
Package variables
No package variables defined.
Included modules
Bio::Annotation::Collection
Bio::Annotation::Comment
Bio::Annotation::DBLink
Bio::Annotation::Reference
Bio::Seq::SeqFactory
Bio::SeqFeature::Generic
Bio::SeqIO::FTHelper
Bio::Species
Inherit
Bio::SeqIO
Synopsis
It is probably best not to use this object directly, but
rather go through the SeqIO handler system. Go:
    $stream = Bio::SeqIO->new(-file => $filename, -format => 'EMBL');
while ( (my $seq = $stream->next_seq()) ) { # do something with $seq }
Description
This object can transform Bio::Seq objects to and from EMBL flat
file databases.
There is a lot of flexibility here about how to dump things which
should be documented more fully.
There should be a common object that this and Genbank share (probably
with Swissprot). Too much of the magic is identical.
   _show_dna()
   (output only) shows the dna or not
   _post_sort()
   (output only) provides a sorting func which is applied to the FTHelpers
before printing
   _id_generation_func()
   This is function which is called as
   print "ID   ", $func($annseq), "\n";
   To generate the ID line. If it is not there, it generates a sensible ID
line using a number of tools.
   If you want to output annotations in EMBL format they need to be
stored in a Bio::Annotation::Collection object which is accessible
through the Bio::SeqI interface method annotation().
   The following are the names of the keys which are polled from a
Bio::Annotation::Collection object.
 reference  - Should contain Bio::Annotation::Reference objects
comment - Should contain Bio::Annotation::Comment objects
dblink - Should contain Bio::Annotation::DBLink objects
Methods
_initialize
No description
Code
next_seqDescriptionCode
_write_ID_lineDescriptionCode
_is_valid_divisionDescriptionCode
_is_valid_molecule_typeDescriptionCode
write_seqDescriptionCode
_print_EMBL_FTHelperDescriptionCode
_read_EMBL_ContigDescriptionCode
_read_EMBL_ReferencesDescriptionCode
_read_EMBL_SpeciesDescriptionCode
_read_EMBL_DBLinkDescriptionCode
_read_EMBL_TaxID_DBLinkDescriptionCode
_filehandleDescriptionCode
_read_FTHelper_EMBLDescriptionCode
_write_line_EMBLDescriptionCode
_write_line_EMBL_regexDescriptionCode
_post_sortDescriptionCode
_show_dnaDescriptionCode
_id_generation_funcDescriptionCode
_ac_generation_funcDescriptionCode
_sv_generation_funcDescriptionCode
_kw_generation_funcDescriptionCode
Methods description
next_seqcode    nextTop
 Title   : next_seq
Usage : $seq = $stream->next_seq()
Function: returns the next sequence in the stream
Returns : Bio::Seq object
Args :
_write_ID_linecodeprevnextTop
 Title   : _write_ID_line
Usage : $self->_write_ID_line($seq);
Function: Writes the EMBL Release 87 format ID line to the stream, unless
: there is a user-supplied ID line generation function in which
: case that is used instead.
: ( See Bio::SeqIO::embl::_id_generation_function(). )
Returns : nothing
Args : Bio::Seq object
_is_valid_divisioncodeprevnextTop
 Title   : _is_valid_division
Usage : $self->_is_valid_division($div)
Function: tests division code for validity
Returns : true if $div is a valid EMBL release 87 taxonomic division.
Args : taxonomic division code string
_is_valid_molecule_typecodeprevnextTop
 Title   : _is_valid_molecule_type
Usage : $self->_is_valid_molecule_type($mol)
Function: tests molecule type for validity
Returns : true if $mol is a valid EMBL release 87 molecule type.
Args : molecule type string
write_seqcodeprevnextTop
 Title   : write_seq
Usage : $stream->write_seq($seq)
Function: writes the $seq object (must be seq) to the stream
Returns : 1 for success and undef for error
Args : array of 1 to n Bio::SeqI objects
_print_EMBL_FTHelpercodeprevnextTop
 Title   : _print_EMBL_FTHelper
Usage :
Function: Internal function
Returns : 1 if writing suceeded, otherwise undef
Args :
_read_EMBL_Contig()codeprevnextTop
 Title   : _read_EMBL_Contig
Usage :
Function: convert CO lines into annotations
Returns :
Args :
_read_EMBL_ReferencescodeprevnextTop
 Title   : _read_EMBL_References
Usage :
Function: Reads references from EMBL format. Internal function really
Example :
Returns :
Args :
_read_EMBL_SpeciescodeprevnextTop
 Title   : _read_EMBL_Species
Usage :
Function: Reads the EMBL Organism species and classification
lines.
Example :
Returns : A Bio::Species object
Args : a reference to the current line buffer, accession number
_read_EMBL_DBLinkcodeprevnextTop
 Title   : _read_EMBL_DBLink
Usage :
Function: Reads the EMBL database cross reference ("DR") lines
Example :
Returns : A list of Bio::Annotation::DBLink objects
Args :
_read_EMBL_TaxID_DBLinkcodeprevnextTop
 Title   : _read_EMBL_TaxID_DBLink
Usage :
Function: Reads the EMBL database cross reference to NCBI TaxID ("OX") lines
Example :
Returns : A list of Bio::Annotation::DBLink objects
Args :
_filehandlecodeprevnextTop
 Title   : _filehandle
Usage : $obj->_filehandle($newval)
Function:
Example :
Returns : value of _filehandle
Args : newvalue (optional)
_read_FTHelper_EMBLcodeprevnextTop
 Title   : _read_FTHelper_EMBL
Usage : _read_FTHelper_EMBL($buffer)
Function: reads the next FT key line
Example :
Returns : Bio::SeqIO::FTHelper object
Args : filehandle and reference to a scalar
_write_line_EMBLcodeprevnextTop
 Title   : _write_line_EMBL
Usage :
Function: internal function
Example :
Returns : 1 if writing suceeded, else undef
Args :
_write_line_EMBL_regexcodeprevnextTop
 Title   : _write_line_EMBL_regex
Usage :
Function: internal function for writing lines of specified
length, with different first and the next line
left hand headers and split at specific points in the
text
Example :
Returns : nothing
Args : file handle, first header, second header, text-line, regex for line breaks, total line length
_post_sortcodeprevnextTop
 Title   : _post_sort
Usage : $obj->_post_sort($newval)
Function:
Returns : value of _post_sort
Args : newvalue (optional)
_show_dnacodeprevnextTop
 Title   : _show_dna
Usage : $obj->_show_dna($newval)
Function:
Returns : value of _show_dna
Args : newvalue (optional)
_id_generation_funccodeprevnextTop
 Title   : _id_generation_func
Usage : $obj->_id_generation_func($newval)
Function:
Returns : value of _id_generation_func
Args : newvalue (optional)
_ac_generation_funccodeprevnextTop
 Title   : _ac_generation_func
Usage : $obj->_ac_generation_func($newval)
Function:
Returns : value of _ac_generation_func
Args : newvalue (optional)
_sv_generation_funccodeprevnextTop
 Title   : _sv_generation_func
Usage : $obj->_sv_generation_func($newval)
Function:
Returns : value of _sv_generation_func
Args : newvalue (optional)
_kw_generation_funccodeprevnextTop
 Title   : _kw_generation_func
Usage : $obj->_kw_generation_func($newval)
Function:
Returns : value of _kw_generation_func
Args : newvalue (optional)
Methods code
_initializedescriptionprevnextTop
sub _initialize {
    my($self,@args) = @_;

    $self->SUPER::_initialize(@args);
    # hash for functions for decoding keys.
$self->{'_func_ftunit_hash'} = {}; # sets this to one by default. People can change it
$self->_show_dna(1); if ( ! defined $self->sequence_factory ) { $self->sequence_factory(Bio::Seq::SeqFactory->new (-verbose => $self->verbose(), -type => 'Bio::Seq::RichSeq')); }
}
next_seqdescriptionprevnextTop
sub next_seq {
    my ($self,@args) = @_;
    my ($pseq,$c,$line,$name,$desc,$acc,$seqc,$mol,$div,
        $date, $comment, @date_arr);

    my ($annotation, %params, @features) =
        Bio::Annotation::Collection->new();

    $line = $self->_readline;
    # This needs to be before the first eof() test
if ( !defined $line ) { return; # no throws - end of file
} if ( $line =~ /^\s+$/ ) { while ( defined ($line = $self->_readline) ) { $line =~/^\S/ && last; } # return without error if the whole next sequence was just a single
# blank line and then eof
return unless $line; } # no ID as 1st non-blank line, need short circuit and exit routine
$self->throw("EMBL stream with no ID. Not embl in my book") unless $line =~ /^ID\s+\S+/; # At this point we are sure that $line contains an ID header line
my $alphabet; if ( $line =~ tr/;/;/ == 6) { # New style headers contain exactly six semicolons.
# New style header (EMBL Release >= 87, after June 2006)
my $topology; my $sv; # ID DQ299383; SV 1; linear; mRNA; STD; MAM; 431 BP.
# This regexp comes from the new2old.pl conversion script, from EBI
if ($line =~ m/^ID (\w+);\s+SV (\d+); (\w+); ([^;]+); (\w{3}); (\w{3}); (\d+) BP./) {
(
$name, $sv, $topology, $mol, $div) = ($1, $2, $3, $4, $6);
} if (defined $sv) { $params{'-seq_version'} = $sv; $params{'-version'} = $sv; } if (defined $topology && $topology eq 'circular') { $params{'-is_circular'} = 1; } if (defined $mol ) { if ($mol =~ /DNA/) { $alphabet = 'dna'; } elsif ($mol =~ /RNA/) { $alphabet = 'rna'; } elsif ($mol =~ /AA/) { $alphabet = 'protein'; } } } else { # Old style header (EMBL Release < 87, before June 2006)
if ($line =~ /^ID\s+(\S+)[^;]*;\s+(\S+)[^;]*;\s+(\S+)[^;]*;/) { ($name, $mol, $div) = ($1, $2, $3); } if ($mol) { if ( $mol =~ /circular/ ) { $params{'-is_circular'} = 1; $mol =~ s|circular ||; } if (defined $mol ) { if ($mol =~ /DNA/) { $alphabet='dna'; } elsif ($mol =~ /RNA/) { $alphabet='rna'; } elsif ($mol =~ /AA/) { $alphabet='protein'; } } } } unless( defined $name && length($name) ) { $name = "unknown_id"; } # $self->warn("not parsing upper annotation in EMBL file yet!");
my $buffer = $line; local $_; BEFORE_FEATURE_TABLE : my $ncbi_taxid; until ( !defined $buffer ) { $_ = $buffer; # Exit at start of Feature table
if ( /^(F[HT]|SQ)/ ) { $self->_pushback($_) if( $1 eq 'SQ' || $1 eq 'FT'); last; } # Description line(s)
if (/^DE\s+(\S.*\S)/) { $desc .= $desc ? " $1" : $1; } #accession number
if ( /^AC\s+(.*)?/ || /^PA\s+(.*)?/) { my @accs = split(/[; ]+/, $1); # allow space in addition
$params{'-accession_number'} = shift @accs unless defined $params{'-accession_number'}; push @{$params{'-secondary_accessions'}}, @accs; } #version number
if ( /^SV\s+\S+\.(\d+);?/ ) { my $sv = $1; #$sv =~ s/\;//;
$params{'-seq_version'} = $sv; $params{'-version'} = $sv; } #date (NOTE: takes last date line)
if ( /^DT\s+(.+)$/ ) { my $line = $1; my ($date, $version) = split(' ', $line, 2); $date =~ tr/,//d; # remove comma if new version
if ($version) { if ($version =~ /\(Rel\. (\d+), Created\)/xms ) { my $release = Bio::Annotation::SimpleValue->new( -tagname => 'creation_release', -value => $1 ); $annotation->add_Annotation($release); } elsif ($version =~ /\(Rel\. (\d+), Last updated, Version (\d+)\)/xms ) { my $release = Bio::Annotation::SimpleValue->new( -tagname => 'update_release', -value => $1 ); $annotation->add_Annotation($release); my $update = Bio::Annotation::SimpleValue->new( -tagname => 'update_version', -value => $2 ); $annotation->add_Annotation($update); } } push @{$params{'-dates'}}, $date; } #keywords
if ( /^KW (.*)\S*$/ ) { my @kw = split(/\s*\;\s*/,$1); push @{$params{'-keywords'}}, @kw; } # Organism name and phylogenetic information
elsif (/^O[SC]/) { # pass the accession number so we can give an informative throw message if necessary
my $species = $self->_read_EMBL_Species(\$buffer, $params{'-accession_number'}); $params{'-species'}= $species; } # NCBI TaxID Xref
elsif (/^OX/) { if (/NCBI_TaxID=(\d+)/) { $ncbi_taxid=$1; } my @links = $self->_read_EMBL_TaxID_DBLink(\$buffer); foreach my $dblink ( @links ) { $annotation->add_Annotation('dblink',$dblink); } } # References
elsif (/^R/) { my @refs = $self->_read_EMBL_References(\$buffer); foreach my $ref ( @refs ) { $annotation->add_Annotation('reference',$ref); } } # DB Xrefs
elsif (/^DR/) { my @links = $self->_read_EMBL_DBLink(\$buffer); foreach my $dblink ( @links ) { $annotation->add_Annotation('dblink',$dblink); } } # Comments
elsif (/^CC\s+(.*)/) { $comment .= $1; $comment .= " "; while (defined ($_ = $self->_readline) ) { if (/^CC\s+(.*)/) { $comment .= $1; $comment .= " "; } else { last; } } my $commobj = Bio::Annotation::Comment->new(); $commobj->text($comment); $annotation->add_Annotation('comment',$commobj); $comment = ""; } # Get next line.
$buffer = $self->_readline; } while ( defined ($_ = $self->_readline) ) { /^FT\s{3}\w/ && last; /^SQ / && last; /^CO / && last; } $buffer = $_; if (defined($buffer) && $buffer =~ /^FT /) { until ( !defined ($buffer) ) { my $ftunit = $self->_read_FTHelper_EMBL(\$buffer); # process ftunit
my $feat = $ftunit->_generic_seqfeature($self->location_factory(), $name); # add taxon_id from source if available
# Notice, this will override what is found in the OX line.
# this is by design as this seems to be the official way
# of specifying a TaxID
if ($params{'-species'} && ($feat->primary_tag eq 'source') && $feat->has_tag('db_xref') && (! $params{'-species'}->ncbi_taxid())) { foreach my $tagval ($feat->get_tag_values('db_xref')) { if (index($tagval,"taxon:") == 0) { $params{'-species'}->ncbi_taxid(substr($tagval,6)); last; } } } # add feature to list of features
push(@features, $feat); if ( $buffer !~ /^FT/ ) { last; } } } # Set taxid found in OX line
if ($params{'-species'} && defined $ncbi_taxid && (! $params{'-species'}->ncbi_taxid())) { $params{'-species'}->ncbi_taxid($ncbi_taxid); } # skip comments
while ( defined ($buffer) && $buffer =~ /^XX/ ) { $buffer = $self->_readline(); } if ( $buffer =~ /^CO/ ) { # bug#2982
# special : create contig as annotation
while ( defined ($buffer) ) { $annotation->add_Annotation($_) for $self->_read_EMBL_Contig(\$buffer); if ( !$buffer || $buffer !~ /^CO/ ) { last; } } $buffer ||= ''; } if ($buffer !~ /^\/\//) { # if no SQ lines following CO (bug#2958)
if ( $buffer !~ /^SQ/ ) { while ( defined ($_ = $self->_readline) ) { /^SQ/ && last; } } $seqc = ""; while ( defined ($_ = $self->_readline) ) { m{^//} && last; $_ = uc($_); s/[^A-Za-z]//g; $seqc .= $_; } } my $seq = $self->sequence_factory->create (-verbose => $self->verbose(), -division => $div, -seq => $seqc, -desc => $desc, -display_id => $name, -annotation => $annotation, -molecule => $mol, -alphabet => $alphabet, -features =>\@ features, %params); return $seq;
}
_write_ID_linedescriptionprevnextTop
sub _write_ID_line {
    my ($self, $seq) = @_;

    my $id_line;
    # If there is a user-supplied ID generation function, use it.
if ( $self->_id_generation_func ) { $id_line = "ID " . &{$self->_id_generation_func}($seq) . "\nXX\n"; } # Otherwise, generate a standard EMBL release 87 (June 2006) ID line.
else { # The sequence name is supposed to be the primary accession number,
my $name = $seq->accession_number(); if ( not(defined $name) || $name eq 'unknown') { # but if it is not present, use the sequence ID or the empty string
$name = $seq->id() || ''; } $self->warn("No whitespace allowed in EMBL id [". $name. "]") if $name =~ /\s/; # Use the sequence version, or default to 1.
my $version = $seq->version() || 1; my $len = $seq->length(); # Taxonomic division.
my $div; if ( $seq->can('division') && defined($seq->division) && $self->_is_valid_division($seq->division) ) { $div = $seq->division(); } else { $div ||= 'UNC'; # 'UNC' is the EMBL division code for 'unclassified'.
} my $mol; # If the molecule type is a valid EMBL type, use it.
if ( $seq->can('molecule') && defined($seq->molecule) && $self->_is_valid_molecule_type($seq->molecule) ) { $mol = $seq->molecule(); } # Otherwise, choose unassigned DNA or RNA based on the alphabet.
elsif ($seq->can('primary_seq') && defined $seq->primary_seq->alphabet) { my $alphabet =$seq->primary_seq->alphabet; if ($alphabet eq 'dna') { $mol ='unassigned DNA'; } elsif ($alphabet eq 'rna') { $mol='unassigned RNA'; } elsif ($alphabet eq 'protein') { $self->warn("Protein sequence found; EMBL is a nucleotide format."); $mol='AA'; # AA is not a valid EMBL molecule type.
} } my $topology = 'linear'; if ($seq->is_circular) { $topology = 'circular'; } $mol ||= ''; # 'unassigned'; ?
$id_line = "ID $name; SV $version; $topology; $mol; STD; $div; $len BP.\nXX\n"; $self->_print($id_line); }
}
_is_valid_divisiondescriptionprevnextTop
sub _is_valid_division {
    my ($self, $division) = @_;

    my %EMBL_divisions = (
                          "PHG"    => 1, # Bacteriophage
"ENV" => 1, # Environmental Sample
"FUN" => 1, # Fungal
"HUM" => 1, # Human
"INV" => 1, # Invertebrate
"MAM" => 1, # Other Mammal
"VRT" => 1, # Other Vertebrate
"MUS" => 1, # Mus musculus
"PLN" => 1, # Plant
"PRO" => 1, # Prokaryote
"ROD" => 1, # Other Rodent
"SYN" => 1, # Synthetic
"UNC" => 1, # Unclassified
"VRL" => 1 # Viral
); return exists($EMBL_divisions{$division});
}
_is_valid_molecule_typedescriptionprevnextTop
sub _is_valid_molecule_type {
    my ($self, $moltype) = @_;

    my %EMBL_molecule_types = (
                               "genomic DNA"    => 1,
                               "genomic RNA"    => 1,
                               "mRNA"           => 1,
                               "tRNA"           => 1,
                               "rRNA"           => 1,
                               "snoRNA"         => 1,
                               "snRNA"          => 1,
                               "scRNA"          => 1,
                               "pre-RNA"        => 1,
                               "other RNA"      => 1,
                               "other DNA"      => 1,
                               "unassigned DNA" => 1,
                               "unassigned RNA" => 1
                              );

    return exists($EMBL_molecule_types{$moltype});
}
write_seqdescriptionprevnextTop
sub write_seq {
    my ($self,@seqs) = @_;

    foreach my $seq ( @seqs ) {
        $self->throw("Attempting to write with no seq!") unless defined $seq;
        unless ( ref $seq && $seq->isa('Bio::SeqI' ) ) {
            $self->warn("$seq is not a SeqI compliant sequence object!")
                if $self->verbose >= 0;
            unless ( ref $seq && $seq->isa('Bio::PrimarySeqI' ) ) {
                $self->throw("$seq is not a PrimarySeqI compliant sequence object!");
            }
        }
        my $str = $seq->seq || '';

        # Write the ID line.
$self->_write_ID_line($seq); # Write the accession line if present
my( $acc ); { if ( my $func = $self->_ac_generation_func ) { $acc = &{$func}($seq); } elsif ( $seq->isa('Bio::Seq::RichSeqI') && defined($seq->accession_number) ) { $acc = $seq->accession_number; $acc = join("; ", $acc, $seq->get_secondary_accessions); } elsif ( $seq->can('accession_number') ) { $acc = $seq->accession_number; } if (defined $acc) { $self->_print("AC $acc;\n", "XX\n") || return; } } # Date lines
my $switch=0; if ( $seq->can('get_dates') ) { my @dates = $seq->get_dates(); my $ct = 1; my $date_flag = 0; my ($cr) = $seq->annotation->get_Annotations("creation_release"); my ($ur) = $seq->annotation->get_Annotations("update_release"); my ($uv) = $seq->annotation->get_Annotations("update_version"); unless ($cr && $ur && $ur) { $date_flag = 1; } foreach my $dt (@dates) { if (!$date_flag) { $self->_write_line_EMBL_regex("DT ","DT ", $dt." (Rel. $cr, Created)", '\s+|$',80) if $ct == 1; $self->_write_line_EMBL_regex("DT ","DT ", $dt." (Rel. $ur, Last updated, Version $uv)", '\s+|$',80) if $ct == 2; } else { # other formats?
$self->_write_line_EMBL_regex("DT ","DT ", $dt,'\s+|$',80); } $switch =1; $ct++; } if ($switch == 1) { $self->_print("XX\n") || return; } } # Description lines
$self->_write_line_EMBL_regex("DE ","DE ",$seq->desc(),'\s+|$',80) || return; #'
$self->_print( "XX\n") || return; # if there, write the kw line
{ my( $kw ); if ( my $func = $self->_kw_generation_func ) { $kw = &{$func}($seq); } elsif ( $seq->can('keywords') ) { $kw = $seq->keywords; } if (defined $kw) { $self->_write_line_EMBL_regex("KW ", "KW ", $kw, '\s+|$', 80) || return; #'
$self->_print( "XX\n") || return; } } # Organism lines
if ($seq->can('species') && (my $spec = $seq->species)) { my @class = $spec->classification(); shift @class; # get rid of species name. Some embl files include
# the species name in the OC lines, but this seems
# more like an error than something we need to
# emulate
my $OS = $spec->scientific_name; if ($spec->common_name) { $OS .= ' ('.$spec->common_name.')'; } $self->_print("OS $OS\n") || return; my $OC = join('; ', reverse(@class)) .'.'; $self->_write_line_EMBL_regex("OC ","OC ",$OC,'; |$',80) || return; if ($spec->organelle) { $self->_write_line_EMBL_regex("OG ","OG ",$spec->organelle,'; |$',80) || return; } my $ncbi_taxid = $spec->ncbi_taxid; if ($ncbi_taxid) { $self->_print("OX NCBI_TaxID=$ncbi_taxid\n") || return; } $self->_print("XX\n") || return; } # Reference lines
my $t = 1; if ( $seq->can('annotation') && defined $seq->annotation ) { foreach my $ref ( $seq->annotation->get_Annotations('reference') ) { $self->_print( "RN [$t]\n") || return; # Having no RP line is legal, but we need both
# start and end for a valid location.
if ($ref->comment) { $self->_write_line_EMBL_regex("RC ", "RC ", $ref->comment, '\s+|$', 80) || return; #'
} my $start = $ref->start; my $end = $ref->end; if ($start and $end) { $self->_print( "RP $start-$end\n") || return; } elsif ($start or $end) { $self->throw("Both start and end are needed for a valid RP line.". " Got: start='$start' end='$end'"); } if (my $med = $ref->medline) { $self->_print( "RX MEDLINE; $med.\n") || return; } if (my $pm = $ref->pubmed) { $self->_print( "RX PUBMED; $pm.\n") || return; } my $authors = $ref->authors; $authors =~ s/([\w\.]) (\w)/$1#$2/g; # add word wrap protection char '#'
$self->_write_line_EMBL_regex("RA ", "RA ", $authors . ";", '\s+|$', 80) || return; #'
# If there is no title to the reference, it appears
# as a single semi-colon. All titles must end in
# a semi-colon.
my $ref_title = $ref->title || ''; $ref_title =~ s/[\s;]*$/;/; $self->_write_line_EMBL_regex("RT ", "RT ", $ref_title, '\s+|$', 80) || return; #'
$self->_write_line_EMBL_regex("RL ", "RL ", $ref->location, '\s+|$', 80) || return; #'
$self->_print("XX\n") || return; $t++; } # DB Xref lines
if (my @db_xref = $seq->annotation->get_Annotations('dblink') ) { for my $dr (@db_xref) { my $db_name = $dr->database; my $prim = $dr->primary_id; my $opt = $dr->optional_id || ''; my $line = $opt ? "$db_name; $prim; $opt." : "$db_name; $prim."; $self->_write_line_EMBL_regex("DR ", "DR ", $line, '\s+|$', 80) || return; #'
} $self->_print("XX\n") || return; } # Comment lines
foreach my $comment ( $seq->annotation->get_Annotations('comment') ) { $self->_write_line_EMBL_regex("CC ", "CC ", $comment->text, '\s+|$', 80) || return; #'
$self->_print("XX\n") || return; } } # "\\s\+\|\$"
## FEATURE TABLE
$self->_print("FH Key Location/Qualifiers\n") || return; $self->_print("FH\n") || return; my @feats = $seq->can('top_SeqFeatures') ? $seq->top_SeqFeatures : (); if ($feats[0]) { if ( defined $self->_post_sort ) { # we need to read things into an array.
# Process. Sort them. Print 'em
my $post_sort_func = $self->_post_sort(); my @fth; foreach my $sf ( @feats ) { push(@fth,Bio::SeqIO::FTHelper::from_SeqFeature($sf,$seq)); } @fth = sort { &$post_sort_func($a,$b) } @fth; foreach my $fth ( @fth ) { $self->_print_EMBL_FTHelper($fth) || return; } } else { # not post sorted. And so we can print as we get them.
# lower memory load...
foreach my $sf ( @feats ) { my @fth = Bio::SeqIO::FTHelper::from_SeqFeature($sf,$seq); foreach my $fth ( @fth ) { if ( $fth->key eq 'CONTIG') { $self->_show_dna(0); } $self->_print_EMBL_FTHelper($fth) || return; } } } } if ( $self->_show_dna() == 0 ) { $self->_print( "//\n") || return; return; } $self->_print( "XX\n") || return; # finished printing features.
# print contig if present : bug#2982
if ( $seq->can('annotation') && defined $seq->annotation) { foreach my $ctg ( $seq->annotation->get_Annotations('contig') ) { if ($ctg->value) { $self->_write_line_EMBL_regex("CO ","CO ", $ctg->value, '[,]|$', 80) || return; } } } # print sequence lines only if sequence is present! bug#2982
if (length($str)) { $str =~ tr/A-Z/a-z/; # Count each nucleotide
my $alen = $str =~ tr/a/a/; my $clen = $str =~ tr/c/c/; my $glen = $str =~ tr/g/g/; my $tlen = $str =~ tr/t/t/; my $len = $seq->length(); my $olen = $seq->length() - ($alen + $tlen + $clen + $glen); if ( $olen < 0 ) { $self->warn("Weird. More atgc than bases. Problem!"); } $self->_print("SQ Sequence $len BP; $alen A; $clen C; $glen G; $tlen T; $olen other;\n") || return; my $nuc = 60; # Number of nucleotides per line
my $whole_pat = 'a10' x 6; # Pattern for unpacking a whole line
my $out_pat = 'A11' x 6; # Pattern for packing a line
my $length = length($str); # Calculate the number of nucleotides which fit on whole lines
my $whole = int($length / $nuc) * $nuc;
# Print the whole lines
my( $i ); for ($i = 0; $i < $whole; $i += $nuc) { my $blocks = pack $out_pat, unpack $whole_pat, substr($str, $i, $nuc); $self->_print(sprintf(" $blocks%9d\n", $i + $nuc)) || return; } # Print the last line
if (my $last = substr($str, $i)) { my $last_len = length($last); my $last_pat = 'a10' x int($last_len / 10) .'a'. $last_len % 10;
my $blocks = pack $out_pat, unpack($last_pat, $last); $self->_print(sprintf(" $blocks%9d\n", $length)) || return; # Add the length to the end
} } $self->_print( "//\n") || return; $self->flush if $self->_flush_on_write && defined $self->_fh; } return 1;
}
_print_EMBL_FTHelperdescriptionprevnextTop
sub _print_EMBL_FTHelper {
    my ($self,$fth) = @_;

    if ( ! ref $fth || ! $fth->isa('Bio::SeqIO::FTHelper') ) {
        $fth->warn("$fth is not a FTHelper class. Attempting to print, but there could be tears!");
    }


    #$self->_print( "FH   Key             Location/Qualifiers\n");
#$self->_print( sprintf("FT %-15s %s\n",$fth->key,$fth->loc));
# let
if ( $fth->key eq 'CONTIG' ) { $self->_print("XX\n") || return; $self->_write_line_EMBL_regex("CO ", "CO ",$fth->loc, '\,|$',80) || return; #'
return 1; } $self->_write_line_EMBL_regex(sprintf("FT %-15s ",$fth->key), "FT ",$fth->loc, '\,|$',80) || return; #'
foreach my $tag ( keys %{$fth->field} ) { if ( ! defined $fth->field->{$tag} ) { next; } foreach my $value ( @{$fth->field->{$tag}} ) { $value =~ s/\"/\"\"/g; if ($value eq "_no_value") { $self->_write_line_EMBL_regex("FT ", "FT ", "/$tag",'.|$',80) || return; #'
} # there are almost 3x more quoted qualifier values and they
# are more common too so we take quoted ones first
#
# Long qualifiers, that will be line wrapped, are always quoted
elsif (!$FTQUAL_NO_QUOTE{$tag} or length("/$tag=$value")>=60) { my $pat = $value =~ /\s/ ? '\s|\-|$' : '.|\-|$'; $self->_write_line_EMBL_regex("FT ", "FT ", "/$tag=\"$value\"",$pat,80) || return; } else { $self->_write_line_EMBL_regex("FT ", "FT ", "/$tag=$value",'.|$',80) || return; #'
} } } return 1;
}
_read_EMBL_ContigdescriptionprevnextTop
sub _read_EMBL_Contig {
    my ($self, $buffer) = @_;
    my @ret;
    if ( $$buffer !~ /^CO/ ) {
        warn("Not parsing line '$$buffer' which maybe important");
    }
    $self->_pushback($$buffer);
    while ( defined ($_ = $self->_readline) ) {
	/^C/ || last;
	/^CO\s+(.*)/ && do {
	push @ret, Bio::Annotation::SimpleValue->new( -tagname => 'contig',
						      -value => $1);
	};
    }
    $$buffer = $_;
    return @ret;

}
#'
}
_read_EMBL_ReferencesdescriptionprevnextTop
sub _read_EMBL_References {
    my ($self,$buffer) = @_;
    my (@refs);

    # assume things are starting with RN
if ( $$buffer !~ /^RN/ ) { warn("Not parsing line '$$buffer' which maybe important"); } my $b1; my $b2; my $title; my $loc; my $au; my $med; my $pm; my $com; while ( defined ($_ = $self->_readline) ) { /^R/ || last; /^RP (\d+)-(\d+)/ && do {$b1=$1;$b2=$2;}; /^RX MEDLINE;\s+(\d+)/ && do {$med=$1}; /^RX PUBMED;\s+(\d+)/ && do {$pm=$1}; /^RA (.*)/ && do { $au = $self->_concatenate_lines($au,$1); next; }; /^RT (.*)/ && do { $title = $self->_concatenate_lines($title,$1); next; }; /^RL (.*)/ && do { $loc = $self->_concatenate_lines($loc,$1); next; }; /^RC (.*)/ && do { $com = $self->_concatenate_lines($com,$1); next; }; } my $ref = Bio::Annotation::Reference->new(); $au =~ s/;\s*$//g; $title =~ s/;\s*$//g; $ref->start($b1); $ref->end($b2); $ref->authors($au); $ref->title($title); $ref->location($loc); $ref->medline($med); $ref->comment($com); $ref->pubmed($pm); push(@refs,$ref); $$buffer = $_; return @refs;
}
_read_EMBL_SpeciesdescriptionprevnextTop
sub _read_EMBL_Species {
    my( $self, $buffer, $acc ) = @_;
    my $org;

    $_ = $$buffer;
    my( $sub_species, $species, $genus, $common, $sci_name, $class_lines );
    while (defined( $_ ||= $self->_readline )) {
        if (/^OS\s+(.+)/) {
            $sci_name .= ($sci_name) ? ' '.$1 : $1;
        } elsif (s/^OC\s+(.+)$//) {
            $class_lines .= $1;
        } elsif (/^OG\s+(.*)/) {
            $org = $1;
        } else {
            last;
        }

        $_ = undef;             # Empty $_ to trigger read of next line
} # $$buffer = $_;
$self->_pushback($_); $sci_name =~ s{\.$}{}; $sci_name || return; # Convert data in classification lines into classification array.
# only split on ';' or '.' so that classification that is 2 or more words
# will still get matched, use map() to remove trailing/leading/intervening
# spaces
my @class = map { s/^\s+//; s/\s+$//; s/\s{2,}/ /g; $_; } split /(?<!subgen)[;\.]+/, $class_lines; # do we have a genus?
my $possible_genus = $class[-1]; $possible_genus .= "|$class[-2]" if $class[-2]; if ($sci_name =~ /^($possible_genus)/) { $genus = $1; ($species) = $sci_name =~ /^$genus\s+(.+)/; } else { $species = $sci_name; } # Don't make a species object if it is "Unknown" or "None"
if ($genus) { return if $genus =~ /^(Unknown|None)$/i; } # is this organism of rank species or is it lower?
# (doesn't catch everything, but at least the guess isn't dangerous)
if ($species =~ /subsp\.|var\./) { ($species, $sub_species) = $species =~ /(.+)\s+((?:subsp\.|var\.).+)/; } # sometimes things have common name in brackets, like
# Schizosaccharomyces pombe (fission yeast), so get rid of the common
# name bit. Probably dangerous if real scientific species name ends in
# bracketed bit.
unless ($class[-1] eq 'Viruses') { ($species, $common) = $species =~ /^(.+)\s+\((.+)\)$/; $sci_name =~ s/\s+\(.+\)$// if $common; } # Bio::Species array needs array in Species -> Kingdom direction
unless ($class[-1] eq $sci_name) { push(@class, $sci_name); } @class = reverse @class; # do minimal sanity checks before we hand off to Bio::Species which won't
# be able to give informative throw messages if it has to throw because
# of problems here
$self->throw("$acc seems to be missing its OS line: invalid.") unless $sci_name; my %names; foreach my $i (0..$#class) { my $name = $class[$i]; $names{$name}++; # this code breaks examples like: Xenopus (Silurana) tropicalis
# commenting out, see bug 3158
#if ($names{$name} > 1 && ($name ne $class[$i - 1])) {
# $self->warn("$acc seems to have an invalid species classification:$name ne $class[$i - 1]");
#}
} my $make = Bio::Species->new(); $make->scientific_name($sci_name); $make->classification(@class); unless ($class[-1] eq 'Viruses') { $make->genus($genus) if $genus; $make->species($species) if $species; $make->sub_species($sub_species) if $sub_species; $make->common_name($common) if $common; } $make->organelle($org) if $org; return $make;
}
_read_EMBL_DBLinkdescriptionprevnextTop
sub _read_EMBL_DBLink {
    my( $self,$buffer ) = @_;
    my( @db_link );

    $_ = $$buffer;
    while (defined( $_ ||= $self->_readline )) {
        if ( /^DR   ([^\s;]+);\s*([^\s;]+);?\s*([^\s;]+)?\.$/) {
        my ($databse, $prim_id, $sec_id) = ($1,$2,$3);
        my $link = Bio::Annotation::DBLink->new(-database    => $databse,
                            -primary_id  => $prim_id,
                            -optional_id => $sec_id);

            push(@db_link, $link);
    } else {
            last;
        }
        $_ = undef;             # Empty $_ to trigger read of next line
} $$buffer = $_; return @db_link;
}
_read_EMBL_TaxID_DBLinkdescriptionprevnextTop
sub _read_EMBL_TaxID_DBLink {
    my( $self,$buffer ) = @_;
    my( @db_link );

    $_ = $$buffer;
    while (defined( $_ ||= $self->_readline )) {
        if ( /^OX   (\S+)=(\d+);$/ ) {
            my ($databse, $prim_id) = ($1,$2);
            my $link = Bio::Annotation::DBLink->new(-database    => $databse,
                                                    -primary_id  => $prim_id,);
            push(@db_link, $link);
        } else {
            last;
        }
        $_ = undef;             # Empty $_ to trigger read of next line
} $$buffer = $_; return @db_link;
}
_filehandledescriptionprevnextTop
sub _filehandle {
    my ($obj,$value) = @_;
    if ( defined $value) {
        $obj->{'_filehandle'} = $value;
    }
    return $obj->{'_filehandle'};
}
_read_FTHelper_EMBLdescriptionprevnextTop
sub _read_FTHelper_EMBL {
    my ($self,$buffer) = @_;

    my ($key,                   # The key of the feature
$loc, # The location line from the feature
@qual, # An arrray of lines making up the qualifiers
); if ($$buffer =~ /^FT\s{3}(\S+)\s+(\S+)/ ) { $key = $1; $loc = $2; # Read all the lines up to the next feature
while ( defined($_ = $self->_readline) ) { if (/^FT(\s+)(.+?)\s*$/) { # Lines inside features are preceeded by 19 spaces
# A new feature is preceeded by 3 spaces
if (length($1) > 4) { # Add to qualifiers if we're in the qualifiers
if (@qual) { push(@qual, $2); } # Start the qualifier list if it's the first qualifier
elsif (substr($2, 0, 1) eq '/') { @qual = ($2); } # We're still in the location line, so append to location
else { $loc .= $2; } } else { # We've reached the start of the next feature
last; } } else { # We're at the end of the feature table
last; } } } elsif ( $$buffer =~ /^CO\s+(\S+)/) { $key = 'CONTIG'; $loc = $1; # Read all the lines up to the next feature
while ( defined($_ = $self->_readline) ) { if (/^CO\s+(\S+)\s*$/) { $loc .= $1; } else { # We've reached the start of the next feature
last; } } } else { # No feature key
return; } # Put the first line of the next feature into the buffer
$$buffer = $_; # Make the new FTHelper object
my $out = Bio::SeqIO::FTHelper->new(); $out->verbose($self->verbose()); $out->key($key); $out->loc($loc); # Now parse and add any qualifiers. (@qual is kept
# intact to provide informative error messages.)
QUAL: for (my $i = 0; $i < @qual; $i++) { $_ = $qual[$i]; my( $qualifier, $value ) = m{^/([^=]+)(?:=(.+))?} or $self->throw("Can't see new qualifier in: $_\nfrom:\n" . join('', map "$_\n", @qual)); if (defined $value) { # Do we have a quoted value?
if (substr($value, 0, 1) eq '"') { # Keep adding to value until we find the trailing quote
# and the quotes are balanced
QUOTES: while ($value !~ /"$/ or $value =~ tr/"/"/ % 2) { #"
$i++; my $next = $qual[$i]; if (!defined($next)) { $self->warn("Unbalanced quote in:\n".join("\n", @qual). "\nAdding quote to close...". "Check sequence quality!"); $value .= '"'; last QUOTES; } # Protein sequence translations need to be joined without spaces,
# other qualifiers need those.
if ($qualifier eq "translation") { $value .= $next; } else { $value .= " $next"; } } # Trim leading and trailing quotes
$value =~ s/^"|"$//g; # Undouble internal quotes
$value =~ s/""/"/g; #"
} } else { $value = '_no_value'; } # Store the qualifier
$out->field->{$qualifier} ||= []; push(@{$out->field->{$qualifier}},$value); } return $out;
}
_write_line_EMBLdescriptionprevnextTop
sub _write_line_EMBL {
    my ($self,$pre1,$pre2,$line,$length) = @_;

    $length || $self->throw("Miscalled write_line_EMBL without length. Programming error!");
    my $subl = $length - length $pre2;
    my $linel = length $line;
    my $i;

    my $sub = substr($line,0,$length - length $pre1);

    $self->_print( "$pre1$sub\n") || return;

    for ($i= ($length - length $pre1);$i < $linel;) {
        $sub = substr($line,$i,($subl));
        $self->_print( "$pre2$sub\n") || return;
        $i += $subl;
    }

    return 1;
}
_write_line_EMBL_regexdescriptionprevnextTop
sub _write_line_EMBL_regex {
    my ($self,$pre1,$pre2,$line,$regex,$length) = @_;

    #print STDOUT "Going to print with $line!\n";
$length || $self->throw("Programming error - called write_line_EMBL_regex without length."); my $subl = $length - (length $pre1) -1 ; my( @lines ); CHUNK: while($line) { foreach my $pat ($regex, '[,;\.\/-]\s|'.$regex, '[,;\.\/-]|'.$regex) { if ($line =~ m/^(.{0,$subl})($pat)(.*)/ ) {
my
$l = $1.$2;
$l =~ s/#/ /g # remove word wrap protection char '#'
if $pre1 eq "RA "; my $newl = $3; $line = substr($line,length($l)); # be strict about not padding spaces according to
# genbank format
$l =~ s/\s+$//; next CHUNK if ($l eq ''); push(@lines, $l); next CHUNK; } } # if we get here none of the patterns matched $subl or less chars
$self->warn("trouble dissecting\" $line\"\n into chunks ". "of $subl chars or less - this tag won't print right"); # insert a space char to prevent infinite loops
$line = substr($line,0,$subl) . " " . substr($line,$subl); } my $s = shift @lines; ($self->_print("$pre1$s\n") || return) if $s; foreach my $s ( @lines ) { $self->_print("$pre2$s\n") || return; } return 1;
}
_post_sortdescriptionprevnextTop
sub _post_sort {
    my $obj = shift;
    if ( @_ ) {
        my $value = shift;
        $obj->{'_post_sort'} = $value;
    }
    return $obj->{'_post_sort'};
}
_show_dnadescriptionprevnextTop
sub _show_dna {
    my $obj = shift;
    if ( @_ ) {
        my $value = shift;
        $obj->{'_show_dna'} = $value;
    }
    return $obj->{'_show_dna'};
}
_id_generation_funcdescriptionprevnextTop
sub _id_generation_func {
    my $obj = shift;
    if ( @_ ) {
        my $value = shift;
        $obj->{'_id_generation_func'} = $value;
    }
    return $obj->{'_id_generation_func'};
}
_ac_generation_funcdescriptionprevnextTop
sub _ac_generation_func {
    my $obj = shift;
    if ( @_ ) {
        my $value = shift;
        $obj->{'_ac_generation_func'} = $value;
    }
    return $obj->{'_ac_generation_func'};
}
_sv_generation_funcdescriptionprevnextTop
sub _sv_generation_func {
    my $obj = shift;
    if ( @_ ) {
        my $value = shift;
        $obj->{'_sv_generation_func'} = $value;
    }
    return $obj->{'_sv_generation_func'};
}
_kw_generation_funcdescriptionprevnextTop
sub _kw_generation_func {
    my $obj = shift;
    if ( @_ ) {
        my $value = shift;
        $obj->{'_kw_generation_func'} = $value;
    }
    return $obj->{'_kw_generation_func'};

}

1;
}
General documentation
FEEDBACKTop
Mailing ListsTop
User feedback is an integral part of the evolution of this and other
Bioperl modules. Send your comments and suggestions preferably to one
of the Bioperl mailing lists. Your participation is much appreciated.
  bioperl-l@bioperl.org                  - General discussion
http://bioperl.org/wiki/Mailing_lists - About the mailing lists
Support Top
Please direct usage questions or support issues to the mailing list:
bioperl-l@bioperl.org
rather than to the module maintainer directly. Many experienced and
reponsive experts will be able look at the problem and quickly
address it. Please include a thorough description of the problem
with code and data examples if at all possible.
Reporting BugsTop
Report bugs to the Bioperl bug tracking system to help us keep track
the bugs and their resolution. Bug reports can be submitted via
the web:
  https://redmine.open-bio.org/projects/bioperl/
AUTHOR - Ewan BirneyTop
Email birney@ebi.ac.uk
APPENDIXTop
The rest of the documentation details each of the object
methods. Internal methods are usually preceded with a _