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13 non-PAUSE users.

Christopher Fields


Bio::SearchIO::Writer::TextResultWriter - Object to implement writing a Bio::Search::ResultI in Text.


  use Bio::SearchIO;
  use Bio::SearchIO::Writer::TextResultWriter;

  my $in = Bio::SearchIO->new(-format => 'blast',
                             -file   => shift @ARGV);

  my $writer = Bio::SearchIO::Writer::TextResultWriter->new();
  my $out = Bio::SearchIO->new(-writer => $writer);


This object implements the SearchWriterI interface which will produce a set of Text for a specific Bio::Search::Report::ReportI interface.

You can also provide the argument -filters => \%hash to filter the at the hsp, hit, or result level. %hash is an associative array which contains any or all of the keys (HSP, HIT, RESULT). The values pointed to by these keys would be references to a subroutine which expects to be passed an object - one of Bio::Search::HSP::HSPI, Bio::Search::Hit::HitI, and Bio::Search::Result::ResultI respectively. Each function needs to return a boolean value as to whether or not the passed element should be included in the output report - true if it is to be included, false if it to be omitted.

For example to filter on sequences in the database which are too short for your criteria you would do the following.

Define a hit filter method

  sub hit_filter { 
      my $hit = shift;
      return $hit->length E<gt> 100; # test if length of the hit sequence
                                     # long enough    
  my $writer = Bio::SearchIO::Writer::TextResultWriter->new(
       -filters => { 'HIT' =E<gt> \&hit_filter }  

Another example would be to filter HSPs on percent identity, let's only include HSPs which are 75% identical or better.

   sub hsp_filter {
       my $hsp = shift;
       return $hsp->percent_identity E<gt> 75;
   my $writer = Bio::SearchIO::Writer::TextResultWriter->new(
       -filters => { 'HSP' =E<gt> \&hsp_filter }  

See Bio::SearchIO::SearchWriterI for more info on the filter method.

This module will use the module Text::Wrap if it is installed to wrap the Query description line. If you do not have Text::Wrap installed this module will work fine but you won't have the Query line wrapped. You will see a warning about this when you first instantiate a TextResultWriter - to avoid these warnings from showing up, simply set the verbosity upon initialization to -1 like this: my $writer = new Bio::SearchIO::Writer::TextResultWriter(-verbose => -1);


Mailing Lists

User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to the Bioperl mailing list. Your participation is much appreciated.

  bioperl-l@bioperl.org                  - General discussion
  http://bioperl.org/wiki/Mailing_lists  - About the mailing lists


Please direct usage questions or support issues to the mailing list:


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 Bugs

Report bugs to the Bioperl bug tracking system to help us keep track of the bugs and their resolution. Bug reports can be submitted via the web:


AUTHOR - Jason Stajich

Email jason@bioperl.org


The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _


 Title   : new
 Usage   : my $obj = Bio::SearchIO::Writer::TextResultWriter->new();
 Function: Builds a new Bio::SearchIO::Writer::TextResultWriter object 
 Returns : Bio::SearchIO::Writer::TextResultWriter
 Args    : -filters => hashref with any or all of the keys (HSP HIT RESULT)
           which have values pointing to a subroutine reference
           which will expect to get a Hit,HSP, Result object respectively
           -no_wublastlinks => boolean. Do not display WU-BLAST lines even if 
                               they are parsed out
                               Links = (1) 


 Purpose   : Produces data for each Search::Result::ResultI in a string.
           : This is an abstract method. For some useful implementations,
           : see ResultTableWriter.pm, HitTableWriter.pm, 
           : and HSPTableWriter.pm.
 Usage     : print $writer->to_string( $result_obj, @args );
 Argument  : $result_obj = A Bio::Search::Result::ResultI object
           : @args = any additional arguments used by your implementation.
 Returns   : String containing data for each search Result or any of its
           : sub-objects (Hits and HSPs).
 Throws    : n/a


  Title   : start_report
  Usage   : $index->start_report( CODE )
  Function: Stores or returns the code to
            write the start of the <HTML> block, the <TITLE> block
            and the start of the <BODY> block of HTML.   Useful
            for (for instance) specifying alternative
            HTML if you are embedding the output in
            an HTML page which you have already started.
            (For example a routine returning a null string).
            Returns \&default_start_report (see below) if not
  Example : $index->start_report( \&my_start_report )
  Returns : ref to CODE if called without arguments
  Args    : CODE


 Title   : default_start_report
 Usage   : $self->default_start_report($result)
 Function: The default method to call when starting a report.
 Returns : sting
 Args    : First argument is a Bio::Search::Result::ResultI


 Title   : title
 Usage   : $self->title($CODE)

  Function: Stores or returns the code to provide HTML for the given
            BLAST report that will appear at the top of the BLAST report
            HTML output.  Useful for (for instance) specifying
            alternative routines to write your own titles.
            Returns \&default_title (see below) if not
  Example : $index->title( \&my_title )
  Returns : ref to CODE if called without arguments
  Args    : CODE


 Title   : default_title
 Usage   : $self->default_title($result)
 Function: Provides HTML for the given BLAST report that will appear
           at the top of the BLAST report output.
 Returns : empty for text implementation
 Args    : First argument is a Bio::Search::Result::ResultI


 Title   : introduction
 Usage   : $self->introduction($CODE)

  Function: Stores or returns the code to provide HTML for the given
            BLAST report detailing the query and the
            database information.
            Useful for (for instance) specifying
            routines returning alternative introductions.
            Returns \&default_introduction (see below) if not
  Example : $index->introduction( \&my_introduction )
  Returns : ref to CODE if called without arguments
  Args    : CODE


 Title   : default_introduction
 Usage   : $self->default_introduction($result)
 Function: Outputs HTML to provide the query
           and the database information
 Returns : string containing HTML
 Args    : First argument is a Bio::Search::Result::ResultI
           Second argument is string holding literature citation


 Title   : end_report
 Usage   : $self->end_report()
 Function: The method to call when ending a report, this is
           mostly for cleanup for formats which require you to 
           have something at the end of the document (</BODY></HTML>)
           for HTML
 Returns : string
 Args    : none


  Title   : id_parser
  Usage   : $index->id_parser( CODE )
  Function: Stores or returns the code used by record_id to
            parse the ID for record from a string.  Useful
            for (for instance) specifying a different
            parser for different flavours of FASTA file. 
            Returns \&default_id_parser (see below) if not
            set. If you supply your own id_parser
            subroutine, then it should expect a fasta
            description line.  An entry will be added to
            the index for each string in the list returned.
  Example : $index->id_parser( \&my_id_parser )
  Returns : ref to CODE if called without arguments
  Args    : CODE


  Title   : default_id_parser
  Usage   : $id = default_id_parser( $header )
  Function: The default Fasta ID parser for Fasta.pm
            Returns $1 from applying the regexp /^>\s*(\S+)/
            to $header.
  Returns : ID string
  Args    : a fasta header line string


 Title   : algorithm_reference
 Usage   : my $reference = $writer->algorithm_reference($result);
 Function: Returns the appropriate Bibliographic reference for the 
           algorithm format being produced
 Returns : String
 Args    : L<Bio::Search::Result::ResultI> to reference

Methods Bio::SearchIO::SearchWriterI

Bio::SearchIO::SearchWriterI inherited methods.


 Title   : filter
 Usage   : $writer->filter('hsp', \&hsp_filter);
 Function: Filter out either at HSP,Hit,or Result level
 Returns : none
 Args    : string => data type,
           CODE reference
 Title   : no_wublastlinks
 Usage   : $obj->no_wublastlinks($newval)
 Function: Get/Set boolean value regarding whether or not to display
           Link = (1) 
           type output in the report output (WU-BLAST only)
 Returns : boolean
 Args    : on set, new boolean value (a scalar or undef, optional)