phpman > perldoc > Dpkg::Changelog(3perl)

NAME
    Dpkg::Changelog - base class to implement a changelog parser

DESCRIPTION
    Dpkg::Changelog is a class representing a changelog file as an array of changelog entries
    (Dpkg::Changelog::Entry). By deriving this class and implementing its parse method, you add the
    ability to fill this object with changelog entries.

METHODS
    $c = Dpkg::Changelog->new(%options)
        Creates a new changelog object.

    $c->set_options(%opts)
        Change the value of some options. "verbose" (defaults to 1) defines whether parse errors are
        displayed as warnings by default. "reportfile" is a string to use instead of the name of the
        file parsed, in particular in error messages. "range" defines the range of entries that we
        want to parse, the parser will stop as soon as it has parsed enough data to satisfy
        $c->get_range($opts{range}).

    $count = $c->parse($fh, $description)
        Read the filehandle and parse a changelog in it. The data in the object is reset before
        parsing new data.

        Returns the number of changelog entries that have been parsed with success.

        This method needs to be implemented by one of the specialized changelog format subclasses.

    $count = $c->load($filename)
        Parse $filename contents for a changelog.

        Returns the number of changelog entries that have been parsed with success.

    $c->reset_parse_errors()
        Can be used to delete all information about errors occurred during previous parse runs.

    $c->parse_error($file, $line_nr, $error, [$line])
        Record a new parse error in $file at line $line_nr. The error message is specified with
        $error and a copy of the line can be recorded in $line.

    $c->get_parse_errors()
        Returns all error messages from the last parse run. If called in scalar context returns a
        human readable string representation. If called in list context returns an array of arrays.
        Each of these arrays contains

        1.  a string describing the origin of the data (a filename usually). If the reportfile
            configuration option was given, its value will be used instead.

        2.  the line number where the error occurred

        3.  an error description

        4.  the original line

    $c->set_unparsed_tail($tail)
        Add a string representing unparsed lines after the changelog entries. Use undef as $tail to
        remove the unparsed lines currently set.

    $c->get_unparsed_tail()
        Return a string representing the unparsed lines after the changelog entries. Returns undef
        if there's no such thing.

    @{$c}
        Returns all the Dpkg::Changelog::Entry objects contained in this changelog in the order in
        which they have been parsed.

    $c->get_range($range)
        Returns an array (if called in list context) or a reference to an array of
        Dpkg::Changelog::Entry objects which each represent one entry of the changelog. $range is a
        hash reference describing the range of entries to return. See section "RANGE SELECTION".

    $c->abort_early()
        Returns true if enough data have been parsed to be able to return all entries selected by
        the range set at creation (or with set_options).

    $str = $c->output()
    "$c"
        Returns a string representation of the changelog (it's a concatenation of the string
        representation of the individual changelog entries).

    $c->output($fh)
        Output the changelog to the given filehandle.

    $c->save($filename)
        Save the changelog in the given file.

    $control = $c->format_range($format, $range)
        Formats the changelog into Dpkg::Control::Changelog objects representing the entries
        selected by the optional range specifier (see "RANGE SELECTION" for details). In scalar
        context returns a Dpkg::Index object containing the selected entries, in list context
        returns an array of Dpkg::Control::Changelog objects.

        With format dpkg the returned Dpkg::Control::Changelog object is coalesced from the entries
        in the changelog that are part of the range requested, with the fields described below, but
        considering that "selected entry" means the first entry of the selected range.

        With format rfc822 each returned Dpkg::Control::Changelog objects represents one entry in
        the changelog that is part of the range requested, with the fields described below, but
        considering that "selected entry" means for each entry.

        The different formats return undef if no entries are matched. The following fields are
        contained in the object(s) returned:

        Source
            package name (selected entry)

        Version
            packages' version (selected entry)

        Distribution
            target distribution (selected entry)

        Urgency
            urgency (highest of all entries in range)

        Maintainer
            person that created the (selected) entry

        Date
            date of the (selected) entry

        Timestamp
            date of the (selected) entry as a timestamp in seconds since the epoch

        Closes
            bugs closed by the (selected) entry/entries, sorted by bug number

        Changes
            content of the (selected) entry/entries

RANGE SELECTION
    A range selection is described by a hash reference where the allowed keys and values are
    described below.

    The following options take a version number as value.

    since
        Causes changelog information from all versions strictly later than version to be used.

    until
        Causes changelog information from all versions strictly earlier than version to be used.

    from
        Similar to "since" but also includes the information for the specified version itself.

    to  Similar to "until" but also includes the information for the specified version itself.

    The following options don't take version numbers as values:

    all If set to a true value, all entries of the changelog are returned, this overrides all other
        options.

    count
        Expects a signed integer as value. Returns "value" entries from the top of the changelog if
        set to a positive integer, and "abs(value)" entries from the tail if set to a negative
        integer.

    offset
        Expects a signed integer as value. Changes the starting point for "count", either counted
        from the top (positive integer) or from the tail (negative integer). "offset" has no effect
        if "count" wasn't given as well.

    Some examples for the above options. Imagine an example changelog with entries for the versions
    1.2, 1.3, 2.0, 2.1, 2.2, 3.0 and 3.1.

      Range                        Included entries
      -----                        ----------------
      since => '2.0'               3.1, 3.0, 2.2
      until => '2.0'               1.3, 1.2
      from  => '2.0'               3.1, 3.0, 2.2, 2.1, 2.0
      to    => '2.0'               2.0, 1.3, 1.2
      count =>  2                  3.1, 3.0
      count => -2                  1.3, 1.2
      count =>  3, offset => 2     2.2, 2.1, 2.0
      count =>  2, offset => -3    2.0, 1.3
      count => -2, offset => 3     3.0, 2.2
      count => -2, offset => -3    2.2, 2.1

    Any combination of one option of "since" and "from" and one of "until" and "to" returns the
    intersection of the two results with only one of the options specified.

CHANGES
  Version 2.00 (dpkg 1.20.0)
    Remove methods: $c->dpkg(), $c->rfc822().

  Version 1.01 (dpkg 1.18.8)
    New method: $c->format_range().

    Deprecated methods: $c->dpkg(), $c->rfc822().

    New field Timestamp in output formats.

  Version 1.00 (dpkg 1.15.6)
    Mark the module as public.