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#$Id$
package Bio::Search::Tiling::MapTileUtils;
use strict;
use warnings;
use Exporter;
BEGIN {
our @ISA = qw( Exporter );
our @EXPORT = qw( get_intervals_from_hsps
interval_tiling
decompose_interval
containing_hsps
covering_groups
_allowable_filters
_set_attributes
_mapping_coeff);
}
# tiling trials
# assumed: intervals are [$a0, $a1], with $a0 <= $a1
=head1 NAME
Bio::Search::Tiling::MapTileUtils - utilities for manipulating closed intervals for an HSP tiling algorithm
=head1 SYNOPSIS
Not used directly.
=head1 DESCRIPTION
Not used directly.
=head1 NOTE
An "interval" in this module is defined as an arrayref C<[$a0, $a1]>, where
C<$a0, $a1> are scalar numbers satisfying C<$a0 E<lt>= $a1>.
=head1 AUTHOR
Mark A. Jensen - maj -at- fortinbras -dot- us
=head1 APPENDIX
=head2 interval_tiling
Title : interval_tiling()
Usage : @tiling = interval_tiling( \@array_of_intervals )
Function: Find minimal set of intervals covering the input set
Returns : array of arrayrefs of the form
( [$interval => [ @indices_of_collapsed_input_intervals ]], ...)
Args : arrayref of intervals
=cut
sub interval_tiling {
return unless $_[0]; # no input
my $n = scalar @{$_[0]};
my %input;
@input{(0..$n-1)} = @{$_[0]};
my @active = (0..$n-1);
my @hold;
my @tiled_ints;
my @ret;
while (@active) {
my $tgt = $input{my $tgt_i = shift @active};
push @tiled_ints, $tgt_i;
my $tgt_not_disjoint = 1;
while ($tgt_not_disjoint) {
$tgt_not_disjoint = 0;
while (my $try_i = shift @active) {
my $try = $input{$try_i};
if ( !are_disjoint($tgt, $try) ) {
$tgt = min_covering_interval($tgt,$try);
push @tiled_ints, $try_i;
$tgt_not_disjoint = 1;
}
else {
push @hold, $try_i;
}
}
if (!$tgt_not_disjoint) {
push @ret, [ $tgt => [@tiled_ints] ];
@tiled_ints = ();
}
@active = @hold;
@hold = ();
}
}
return @ret;
}
=head2 decompose_interval
Title : decompose_interval
Usage : @decomposition = decompose_interval( \@overlappers )
Function: Calculate the disjoint decomposition of a set of
overlapping intervals, each annotated with a list of
covering intervals
Returns : array of arrayrefs of the form
( [[@interval] => [@indices_of_coverers]], ... )
Args : arrayref of intervals (arrayrefs like [$a0, $a1], with
Note : Each returned interval is associated with a list of indices of the
original intervals that cover that decomposition component
(scalar size of this list could be called the 'coverage coefficient')
Note : Coverage: each component of the decomp is completely contained
in the input intervals that overlap it, by construction.
Caveat : This routine expects the members of @overlappers to overlap,
but doesn't check this.
=cut
### what if the input intervals don't overlap?? They MUST overlap; that's
### what interval_tiling() is for.
sub decompose_interval {
return unless $_[0]; # no input
my @ints = @{$_[0]};
my (%flat,@flat);
### this is ok, but need to handle the case where a lh and rh endpoint
### coincide...
# decomposition --
# flatten:
# every lh endpoint generates (lh-1, lh)
# every rh endpoint generates (rh, rh+)
foreach (@ints) {
$flat{$$_[0]-1}++;
$flat{$$_[0]}++;
$flat{$$_[1]}++;
$flat{$$_[1]+1}++;
}
# sort, create singletons if nec.
my @a;
@a = sort {$a<=>$b} keys %flat;
# throw out first and last (meeting a boundary condition)
shift @a; pop @a;
# look for singletons
@flat = (shift @a, shift @a);
if ( $flat[1]-$flat[0] == 1 ) {
@flat = ($flat[0],$flat[0], $flat[1]);
}
while (my $a = shift @a) {
if ($a-$flat[-2]==2) {
push @flat, $flat[-1]; # create singleton interval
}
push @flat, $a;
}
if ($flat[-1]-$flat[-2]==1 and @flat % 2) {
push @flat, $flat[-1];
}
# component intervals are consecutive pairs
my @decomp;
while (my $a = shift @flat) {
push @decomp, [$a, shift @flat];
}
# for each component, return a list of the indices of the input intervals
# that cover the component.
my @coverage;
foreach my $i (0..$#decomp) {
foreach my $j (0..$#ints) {
unless (are_disjoint($decomp[$i], $ints[$j])) {
if (defined $coverage[$i]) {
push @{$coverage[$i]}, $j;
}
else {
$coverage[$i] = [$j];
}
}
}
}
return map { [$decomp[$_] => $coverage[$_]] } (0..$#decomp);
}
=head2 are_disjoint
Title : are_disjoint
Usage : are_disjoint( [$a0, $a1], [$b0, $b1] )
Function: Determine if two intervals are disjoint
Returns : True if the intervals are disjoint, false if they overlap
Args : array of two intervals
=cut
sub are_disjoint {
my ($int1, $int2) = @_;
return 1 if ( $$int1[1] < $$int2[0] ) || ( $$int2[1] < $$int1[0]);
return 0;
}
=head2 min_covering_interval
Title : min_covering_interval
Usage : $interval = min_covering_interval( [$a0,$a1],[$b0,$b1] )
Function: Determine the minimal covering interval for two intervals
Returns : an interval
Args : two intervals
=cut
sub min_covering_interval {
my ($int1, $int2) = @_;
my @a = sort {$a <=> $b} (@$int1, @$int2);
return [$a[0],$a[-1]];
}
=head2 get_intervals_from_hsps
Title : get_intervals_from_hsps
Usage : @intervals = get_intervals_from_hsps($type, @hsp_objects)
Function: Return array of intervals of the form [ $start, $end ],
from an array of hsp objects
Returns : an array of intervals
Args : scalar $type, array of HSPI objects; where $type is one of 'hit',
'subject', 'query'
=cut
sub get_intervals_from_hsps {
my $type = shift;
my @hsps;
if (ref($type) =~ /HSP/) {
push @hsps, $type;
$type = 'query';
}
elsif ( !grep /^$type$/,qw( hit subject query ) ) {
die "Unknown HSP type '$type'";
}
$type = 'hit' if $type eq 'subject';
push @hsps, @_;
my @ret;
foreach (@hsps) {
# push @ret, [ $_->start($type), $_->end($type)];
push @ret, [ $_->range($type) ];
}
return @ret;
}
# fast, clear, nasty, brutish and short.
# for _allowable_filters(), _set_mapping()
# covers BLAST, FAST families
# FASTA is ambiguous (nt or aa) based on alg name only
my $alg_lookup = {
'N' => { 'mapping' => [1,1],
'def_context' => ['p_','p_'],
'has_strand' => [1, 1],
'has_frame' => [0, 0]},
'P' => { 'mapping' => [1,1],
'def_context' => ['all','all'],
'has_strand' => [0, 0],
'has_frame' => [0, 0]},
'X' => { 'mapping' => [3, 1],
'def_context' => [undef,'all'],
'has_strand' => [1, 0],
'has_frame' => [1, 0]},
'Y' => { 'mapping' => [3, 1],
'def_context' => [undef,'all'],
'has_strand' => [1, 0],
'has_frame' => [1, 0]},
'TA' => { 'mapping' => [1, 3],
'def_context' => ['all',undef],
'has_strand' => [0, 1],
'has_frame' => [0, 1]},
'TN' => { 'mapping' => [1, 3],
'def_context' => ['p_',undef],
'has_strand' => [1,1],
'has_frame' => [0, 1]},
'TX' => { 'mapping' => [3, 3],
'def_context' => [undef,undef],
'has_strand' => [1, 1],
'has_frame' => [1, 1]},
'TY' => { 'mapping' => [3, 3],
'def_context' => [undef,undef],
'has_strand' => [1, 1],
'has_frame' => [1, 1]}
};
=head2 _allowable_filters
Title : _allowable_filters
Usage : _allowable_filters($Bio_Search_Hit_HitI, $type)
Function: Return the HSP filters (strand, frame) allowed,
based on the reported algorithm
Returns : String encoding allowable filters:
s = strand, f = frame
Empty string if no filters allowed
undef if algorithm unrecognized
Args : A Bio::Search::Hit::HitI object,
scalar $type, one of 'hit', 'subject', 'query';
default is 'query'
=cut
sub _allowable_filters {
my $hit = shift;
my $type = shift;
$type ||= 'q';
unless (grep /^$type$/, qw( h q s ) ) {
warn("Unknown type '$type'; returning ''");
return '';
}
$type = 'h' if $type eq 's';
my $alg = $hit->algorithm;
# pretreat (i.e., kludge it)
$alg =~ /^RPS/ and ($alg) = ($alg =~ /\(([^)]+)\)/);
for ($hit->algorithm) {
/MEGABLAST/i && do {
return qr/[s]/;
};
/(.?)BLAST(.?)/i && do {
return $$alg_lookup{$1.$2}{$type};
};
/(.?)FAST(.?)/ && do {
return $$alg_lookup{$1.$2}{$type};
};
do { # unrecognized
last;
};
}
return;
}
=head2 _set_attributes
Title : _set_attributes
Usage : $tiling->_set_attributes()
Function: Sets attributes for invocant
that depend on algorithm name
Returns : True on success
Args : none
Note : setting based on the configuration table
%alg_lookup
=cut
sub _set_attributes {
my $self = shift;
my $alg = $self->hit->algorithm;
# pretreat (i.e., kludge it)
$alg =~ /^RPS/ and ($alg) = ($alg =~ /\(([^)]+)\)/);
for ($alg) {
/MEGABLAST/i && do {
($self->{_mapping_query},$self->{_mapping_hit}) = (1,1);
($self->{_def_context_query},$self->{_def_context_hit}) =
('p_','p_');
($self->{_has_frame_query},$self->{_has_frame_hit}) =
(0, 0);
($self->{_has_strand_query},$self->{_has_strand_hit}) =
(1, 1);
last;
};
/(.?)BLAST(.?)/i && do {
($self->{_mapping_query},$self->{_mapping_hit}) =
@{$$alg_lookup{$1.$2}{mapping}};
($self->{_def_context_query},$self->{_def_context_hit}) =
@{$$alg_lookup{$1.$2}{def_context}};
($self->{_has_frame_query},$self->{_has_frame_hit}) =
@{$$alg_lookup{$1.$2}{has_frame}};
($self->{_has_strand_query},$self->{_has_strand_hit}) =
@{$$alg_lookup{$1.$2}{has_strand}};
last;
};
/(.?)FAST(.?)/ && do {
($self->{_mapping_query},$self->{_mapping_hit}) =
@{$$alg_lookup{$1.$2}{mapping}};
($self->{_def_context_query},$self->{_def_context_hit}) =
@{$$alg_lookup{$1.$2}{def_context}};
($self->{_has_frame_query},$self->{_has_frame_hit}) =
@{$$alg_lookup{$1.$2}{has_frame}};
($self->{_has_strand_query},$self->{_has_strand_hit}) =
@{$$alg_lookup{$1.$2}{has_strand}};
last;
};
do { # unrecognized
$self->warn("Unrecognized algorithm '$alg'; defaults may not work");
($self->{_mapping_query},$self->{_mapping_hit}) = (1,1);
($self->{_def_context_query},$self->{_def_context_hit}) =
('all','all');
($self->{_has_frame_query},$self->{_has_frame_hit}) =
(0,0);
($self->{_has_strand_query},$self->{_has_strand_hit}) =
(0,0);
return 0;
last;
};
}
return 1;
}
sub _mapping_coeff {
my $obj = shift;
my $type = shift;
my %type_i = ( 'query' => 0, 'hit' => 1 );
unless ( ref($obj) && $obj->can('algorithm') ) {
$obj->warn("Object type unrecognized");
return undef;
}
$type ||= 'query';
unless ( grep(/^$type$/, qw( query hit subject ) ) ) {
$obj->warn("Sequence type unrecognized");
return undef;
}
$type = 'hit' if $type eq 'subject';
my $alg = $obj->algorithm;
# pretreat (i.e., kludge it)
$alg =~ /^RPS/ and ($alg) = ($alg =~ /\(([^)]+)\)/);
for ($alg) {
/MEGABLAST/i && do {
return 1;
};
/(.?)BLAST(.?)/i && do {
return $$alg_lookup{$1.$2}{'mapping'}[$type_i{$type}];
};
/(.?)FAST(.?)/ && do {
return $$alg_lookup{$1.$2}{'mapping'}[$type_i{$type}];
};
do { # unrecognized
last;
};
}
return;
}
# a graphical depiction of a set of intervals
sub _ints_as_text {
my $ints = shift;
my @ints = @$ints;
my %pos;
for (@ints) {
$pos{$$_[0]}++;
$pos{$$_[1]}++;
}
my @pos = sort {$a<=>$b} keys %pos;
@pos = map {sprintf("%03d",$_)} @pos;
#header
my $max=0;
$max = (length > $max) ? length : $max for (@pos);
for my $j (0..$max-1) {
my $i = $max-1-$j;
my @line = map { substr($_, $j, 1) || '0' } @pos;
print join('', @line), "\n";
}
print '-' x @pos, "\n";
undef %pos;
@pos{map {sprintf("%d",$_)} @pos} = (0..@pos);
foreach (@ints) {
print ' ' x $pos{$$_[0]}, '[', ' ' x ($pos{$$_[1]}-$pos{$$_[0]}-1), ']', ' ' x (@pos-$pos{$$_[1]}), "\n";
}
}
=head2 containing_hsps()
Title : containing_hsps
Usage : @hsps = containing_hsps($interval, @hsps_to_search)
Function: Return a list of hsps whose coordinates completely contain the
given $interval
Returns : Array of HSP objects
Args : $interval : [$int1, $int2],
array of HSP objects
=cut
# could be more efficient if hsps are assumed ordered...
sub containing_hsps {
my $intvl = shift;
my @hsps = @_;
my @ret;
my ($beg, $end) = @$intvl;
foreach my $hsp (@hsps) {
my ($start, $stop) = ($hsp->start, $hsp->end);
push @ret, $hsp if ( $start <= $beg and $end <= $stop );
}
return @ret;
}
=head2 covering_groups()
Title : covering_groups
Usage :
Function: divide a list of **ordered,disjoint** intervals (as from a
coverage map) into a set of disjoint covering groups
Returns : array of arrayrefs, each arrayref a covering set of
intervals
Args : array of intervals
=cut
sub covering_groups {
my @intervals = @_;
return unless @intervals;
my (@groups, $grp);
push @{$groups[0]}, shift @intervals;
$grp = $groups[0];
for (my $intvl = shift @intervals; @intervals; $intvl = shift @intervals) {
if ( $intvl->[0] - $grp->[-1][1] == 1 ) { # intervals are direcly adjacent
push @$grp, $intvl;
}
else {
$grp = [$intvl];
push @groups, $grp;
}
}
return @groups;
}
1;
# need our own subsequencer for hsps.
package Bio::Search::HSP::HSPI;
use strict;
use warnings;
=head2 matches_MT
Title : matches_MT
Usage : $hsp->matches($type, $action, $start, $end)
Purpose : Get the total number of identical or conserved matches
in the query or sbjct sequence for the given HSP. Optionally can
report data within a defined interval along the seq.
Returns : scalar int
Args :
Comments : Relies on seq_str('match') to get the string of alignment symbols
between the query and sbjct lines which are used for determining
the number of identical and conservative matches.
Note : Modeled on Bio::Search::HSP::HSPI::matches
=cut
sub matches_MT {
use integer;
my( $self, @args ) = @_;
my($type, $action, $beg, $end) = $self->_rearrange( [qw(TYPE ACTION START END)], @args);
my @actions = qw( identities conserved searchutils );
# prep $type
$self->throw("Type not specified") if !defined $type;
$self->throw("Type '$type' unrecognized") unless grep(/^$type$/,qw(query hit subject));
$type = 'hit' if $type eq 'subject';
# prep $action
$self->throw("Action not specified") if !defined $action;
$self->throw("Action '$action' unrecognized") unless grep(/^$action$/, @actions);
my ($len_id, $len_cons);
my $c = Bio::Search::Tiling::MapTileUtils::_mapping_coeff($self, $type);
if ((defined $beg && !defined $end) || (!defined $beg && defined $end)) {
$self->throw("Both start and end are required");
}
elsif ( (!defined($beg) && !defined($end)) || !$self->seq_str('match') ) {
## Get data for the whole alignment.
# the reported values x mapping
$self->debug("Sequence data not present in report; returning data for entire HSP") unless $self->seq_str('match');
($len_id, $len_cons) = map { $c*$_ } ($self->num_identical, $self->num_conserved);
for ($action) {
$_ eq 'identities' && do {
return $len_id;
};
$_ eq 'conserved' && do {
return $len_cons;
};
$_ eq 'searchutils' && do {
return ($len_id, $len_cons);
};
do {
$self->throw("What are YOU doing here?");
};
}
}
else {
## Get the substring representing the desired sub-section of aln.
my($start,$stop) = $self->range($type);
if ( $beg < $start or $stop < $end ) {
$self->throw("Start/stop out of range [$start, $stop]");
}
# handle gaps
my $match_str = $self->seq_str('match');
if ($self->gaps) {
# strip the homology string of gap positions relative
# to the target type
$match_str = $self->seq_str('match');
my $tgt = $self->seq_str($type);
my $encode = $match_str ^ $tgt;
my $zap = '-'^' ';
$encode =~ s/$zap//g;
$tgt =~ s/-//g;
$match_str = $tgt ^ $encode;
# match string is now the correct length for substr'ing below,
# given that start and end are gapless coordinates in the
# blast report
}
my $seq = "";
$seq = substr( $match_str,
int( ($beg-$start)/Bio::Search::Tiling::MapTileUtils::_mapping_coeff($self, $type) ),
int( 1+($end-$beg)/Bio::Search::Tiling::MapTileUtils::_mapping_coeff($self, $type) )
);
if(!CORE::length $seq) {
$self->throw("Undefined sub-sequence ($beg,$end). Valid range = $start - $stop");
}
$seq =~ s/ //g; # remove space (no info).
$len_cons = (CORE::length $seq)*(Bio::Search::Tiling::MapTileUtils::_mapping_coeff($self,$type));
$seq =~ s/\+//g; # remove '+' characters (conservative substitutions)
$len_id = (CORE::length $seq)*(Bio::Search::Tiling::MapTileUtils::_mapping_coeff($self,$type));
for ($action) {
$_ eq 'identities' && do {
return $len_id;
};
$_ eq 'conserved' && do {
return $len_cons;
};
$_ eq 'searchutils' && do {
return ($len_id, $len_cons);
};
do {
$self->throw("What are YOU doing here?");
};
}
}
}
1;
package Bio::LocatableSeq;
use strict;
use warnings;
# mixin the Bio::FeatureHolderI implementation of
# Bio::Seq -- for get_tiled_aln
=head2 get_SeqFeatures
Title : get_SeqFeatures
Usage :
Function: Get the feature objects held by this feature holder.
Features which are not top-level are subfeatures of one or
more of the returned feature objects, which means that you
must traverse the subfeature arrays of each top-level
feature object in order to traverse all features associated
with this sequence.
Top-level features can be obtained by tag, specified in
the argument.
Use get_all_SeqFeatures() if you want the feature tree
flattened into one single array.
Example :
Returns : an array of Bio::SeqFeatureI implementing objects
Args : [optional] scalar string (feature tag)
=cut
sub get_SeqFeatures{
my $self = shift;
my $tag = shift;
if( !defined $self->{'_as_feat'} ) {
$self->{'_as_feat'} = [];
}
if ($tag) {
return map { $_->primary_tag eq $tag ? $_ : () } @{$self->{'_as_feat'}};
}
else {
return @{$self->{'_as_feat'}};
}
}
=head2 feature_count
Title : feature_count
Usage : $seq->feature_count()
Function: Return the number of SeqFeatures attached to a sequence
Returns : integer representing the number of SeqFeatures
Args : None
=cut
sub feature_count {
my ($self) = @_;
if (defined($self->{'_as_feat'})) {
return ($#{$self->{'_as_feat'}} + 1);
} else {
return 0;
}
}
=head2 add_SeqFeature
Title : add_SeqFeature
Usage : $seq->add_SeqFeature($feat);
$seq->add_SeqFeature(@feat);
Function: Adds the given feature object (or each of an array of feature
objects to the feature array of this
sequence. The object passed is required to implement the
Bio::SeqFeatureI interface.
Returns : 1 on success
Args : A Bio::SeqFeatureI implementing object, or an array of such objects.
=cut
sub add_SeqFeature {
my ($self,@feat) = @_;
$self->{'_as_feat'} = [] unless $self->{'_as_feat'};
foreach my $feat ( @feat ) {
if( !$feat->isa("Bio::SeqFeatureI") ) {
$self->throw("$feat is not a SeqFeatureI and that's what we expect...");
}
$feat->attach_seq($self);
push(@{$self->{'_as_feat'}},$feat);
}
return 1;
}
=head2 remove_SeqFeatures
Title : remove_SeqFeatures
Usage : $seq->remove_SeqFeatures();
Function: Flushes all attached SeqFeatureI objects.
To remove individual feature objects, delete those from the returned
array and re-add the rest.
Example :
Returns : The array of Bio::SeqFeatureI objects removed from this seq.
Args : None
=cut
sub remove_SeqFeatures {
my $self = shift;
return () unless $self->{'_as_feat'};
my @feats = @{$self->{'_as_feat'}};
$self->{'_as_feat'} = [];
return @feats;
}
1;