| Bio::SeqIO::table(3pm) | User Contributed Perl Documentation | Bio::SeqIO::table(3pm) |
Bio::SeqIO::table - sequence input/output stream from a delimited table
# Do not to use this object directly, use Bio::SeqIO, for example:
$in = Bio::SeqIO->new(-file => $filename, -format => 'table');
while ( my $seq = $in->next_seq() ) {
# do something with $seq
}
This class transforms records in a table-formatted text file into Bio::Seq objects.
A table-formatted text file of sequence records for the purposes of this module is defined as a text file with each row corresponding to a sequence, and the attributes of the sequence being in different columns. Columns are delimited by a common delimiter, for instance tab or comma.
The module permits specifying which columns hold which type of annotation. The semantics of certain attributes, if present, are pre-defined, e.g., accession number and sequence. Additional attributes may be added to the annotation bundle.
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Please direct usage questions or support issues to the mailing list:
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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.
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The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
Title : new
Usage : $stream = Bio::SeqIO->new(-file => $filename, -format => 'table')
Function: Returns a new seqstream
Returns : A Bio::SeqIO stream for a table format
Args : Named parameters:
-file Name of file to read
-fh Filehandle to attach to
-comment Leading character(s) introducing a comment line
-header the number of header lines to skip; the first
non-comment header line will be used to obtain
column names; column names will be used as the
default tags for attaching annotation.
-delim The delimiter for columns as a regular expression;
consecutive occurrences of the delimiter will
not be collapsed.
-display_id The one-based index of the column containing
the display ID of the sequence
-accession_number The one-based index of the column
containing the accession number of the sequence
-seq The one-based index of the column containing
the sequence string of the sequence
-desc The one-based index of the column containing
the description of the sequence
-species The one-based index of the column containing the
species for the sequence record; if not a
number, will be used as the static species
common to all records
-annotation If provided and a scalar (but see below), a
flag whether or not all additional columns are
to be preserved as annotation, the tags used
will either be 'colX' if there is no column
header and where X is the one-based column
index, and otherwise the column headers will be
used as tags;
If a reference to an array, or a square
bracket-enclosed string of comma-delimited
values, only those columns (one-based index)
will be preserved as annotation, tags as before;
If a reference to a hash, or a curly
braces-enclosed string of comma-delimited key
and value pairs in alternating order, the keys
are one-based column indexes to be preserved,
and the values are the tags under which the
annotation is to be attached; if not provided or
supplied as undef, no additional annotation will
be preserved.
-colnames A reference to an array of column labels, or a
string of comma-delimited labels, denoting the
columns to be converted into annotation; this is
an alternative to -annotation and will be
ignored if -annotation is also supplied with a
valid value.
-trim Flag determining whether or not all values should
be trimmed of leading and trailing white space
and double quotes
Additional arguments may be used to e.g. set factories and
builders involved in the sequence object creation (see the
POD of Bio::SeqIO).
Title : next_seq Usage : $seq = $stream->next_seq() Function: returns the next sequence in the stream Returns : Bio::Seq::RichSeq object Args :
Title : comment_char
Usage : $obj->comment_char($newval)
Function: Get/set the leading character(s) designating a line as
a comment-line.
Example :
Returns : value of comment_char (a scalar)
Args : on set, new value (a scalar or undef, optional)
Title : header
Usage : $obj->header($newval)
Function: Get/set the number of header lines to skip before the
rows containing actual sequence records.
If set to zero or undef, means that there is no header and
therefore also no column headers.
Example :
Returns : value of header (a scalar)
Args : on set, new value (a scalar or undef, optional)
Title : delimiter
Usage : $obj->delimiter($newval)
Function: Get/set the column delimiter. This will in fact be
treated as a regular expression. Consecutive occurrences
will not be collapsed to a single one.
Example :
Returns : value of delimiter (a scalar)
Args : on set, new value (a scalar or undef, optional)
Title : attribute_map
Usage : $obj->attribute_map($newval)
Function: Get/set the map of sequence object initialization
attributes (keys) to one-based column index.
Attributes will usually need to be prefixed by a dash, just
as if they were passed to the new() method of the sequence
class.
Example :
Returns : value of attribute_map (a reference to a hash)
Args : on set, new value (a reference to a hash or undef, optional)
Title : annotation_map
Usage : $obj->annotation_map($newval)
Function: Get/set the mapping between one-based column indexes
(keys) and annotation tags (values).
Note that the map returned by this method may change after
the first next_seq() call if the file contains a column
header and no annotation keys have been predefined in the
map, because upon reading the column header line the tag
names will be set automatically.
Note also that the map may reference columns that are used
as well in the sequence attribute map.
Example :
Returns : value of annotation_map (a reference to a hash)
Args : on set, new value (a reference to a hash or undef, optional)
Title : keep_annotation
Usage : $obj->keep_annotation($newval)
Function: Get/set flag whether or not to keep values from
additional columns as annotation.
Additional columns are all those columns in the input file
that aren't referenced in the attribute map.
Example :
Returns : value of keep_annotation (a scalar)
Args : on set, new value (a scalar or undef, optional)
Title : annotation_columns
Usage : $obj->annotation_columns($newval)
Function: Get/set the names (labels) of the columns to be used for
annotation.
This is an alternative to using annotation_map. In order to
have any effect, it must be set before the first call of
next_seq(), and obviously there must be a header line (or
row) too giving the column labels.
Example :
Returns : value of annotation_columns (a reference to an array)
Args : on set, new value (a reference to an array of undef, optional)
Title : trim_values
Usage : $obj->trim_values($newval)
Function: Get/set whether or not to trim leading and trailing
whitespace off all column values.
Example :
Returns : value of trim_values (a scalar)
Args : on set, new value (a scalar or undef, optional)
Title: write_seq Usage: write_seq() is not implemented for table format output.
All methods with a leading underscore are not meant to be part of the 'official' API. They are for use by this module only, consider them private unless you are a developer trying to modify this module.
Title : _attribute_map
Usage : $obj->_attribute_map($newval)
Function: Get only. Same as attribute_map, but zero-based indexes.
Note that any changes made to the returned map will change
the map used by this instance. You should know what you are
doing if you modify the returned value (or if you call this
method in the first place).
Example :
Returns : value of _attribute_map (a reference to a hash)
Args : none
Title : _annotation_map
Usage : $obj->_annotation_map($newval)
Function: Get only. Same as annotation_map, but with zero-based indexes.
Note that any changes made to the returned map will change
the map used by this instance. You should know what you are
doing if you modify the returned value (or if you call this
method in the first place).
Example :
Returns : value of _annotation_map (a reference to a hash)
Args : none
Title : _header_skipped
Usage : $obj->_header_skipped($newval)
Function: Get/set the flag whether the header was already
read (and skipped) or not.
Example :
Returns : value of _header_skipped (a scalar)
Args : on set, new value (a scalar or undef, optional)
Title : _next_record
Usage :
Function: Navigates the underlying file to the next record.
For row-based records in delimited text files, this will
skip all empty lines and lines with a leading comment
character.
This method is here is to serve as a hook for other formats
that conceptually also represent tables but aren't
formatted as row-based text files.
Example :
Returns : TRUE if the navigation was successful and FALSE
otherwise. Unsuccessful navigation will usually be treated
as an end-of-file condition.
Args :
Title : _parse_header
Usage :
Function: Parse the table header and navigate past it.
This method is called if the number of header rows has been
specified equal to or greater than one, and positioned at
the first header line (row). By default the first header
line (row) is used for setting column names, but additional
lines (rows) may be skipped too. Empty lines and comment
lines do not count as header lines (rows).
This method will call _next_record() to navigate to the
next header line (row), if there is more than one header
line (row). Upon return, the file is presumed to be
positioned at the first record after the header.
This method is here is to serve as a hook for other formats
that conceptually also represent tables but aren't
formatted as row-based text files.
Note however that the only methods used to access file
content or navigate the position are _get_row_values() and
_next_record(), so it should usually suffice to override
those.
Example :
Returns : TRUE if navigation past the header was successful and FALSE
otherwise. Unsuccessful navigation will usually be treated
as an end-of-file condition.
Args :
Title : _get_row_values
Usage :
Function: Get the values for the current line (or row) as an array in
the order of columns.
This method is here is to serve as a hook for other formats
that conceptually also represent tables but aren't
formatted as row-based text files.
Example :
Returns : An array of column values for the current row.
Args :
| 2018-10-27 | perl v5.26.2 |