phpman > perldoc > Dpkg::Control::HashCore(3perl)

NAME
    Dpkg::Control::HashCore - parse and manipulate a block of RFC822-like fields

DESCRIPTION
    The Dpkg::Control::Hash class is a hash-like representation of a set of RFC822-like fields. The
    fields names are case insensitive and are always capitalized the same when output (see
    field_capitalize function in Dpkg::Control::Fields). The order in which fields have been set is
    remembered and is used to be able to dump back the same content. The output order can also be
    overridden if needed.

    You can store arbitrary values in the hash, they will always be properly escaped in the output
    to conform to the syntax of control files. This is relevant mainly for multilines values: while
    the first line is always output unchanged directly after the field name, supplementary lines are
    modified. Empty lines and lines containing only dots are prefixed with " ." (space + dot) while
    other lines are prefixed with a single space.

    During parsing, trailing spaces are stripped on all lines while leading spaces are stripped only
    on the first line of each field.

METHODS
    $c = Dpkg::Control::Hash->new(%opts)
        Creates a new object with the indicated options. Supported options are:

        allow_pgp
                Configures the parser to accept OpenPGP signatures around the control information.
                Value can be 0 (default) or 1.

        allow_duplicate
                Configures the parser to allow duplicate fields in the control information. The last
                value overrides any previous values. Value can be 0 (default) or 1.

        keep_duplicate
                Configure the parser to keep values for duplicate fields found in the control
                information (when allow_duplicate is enabled), as array references. Value can be 0
                (default) or 1.

        drop_empty
                Defines if empty fields are dropped during the output. Value can be 0 (default) or
                1.

        name    The user friendly name of the information stored in the object. It might be used in
                some error messages or warnings. A default name might be set depending on the type.

        is_pgp_signed
                Set by the parser (starting in dpkg 1.17.0) if it finds an OpenPGP signature around
                the control information. Value can be 0 (default) or 1, and undef when the option is
                not supported by the code (in versions older than dpkg 1.17.0).

    $c->set_options($option, %opts)
        Changes the value of one or more options.

    $value = $c->get_option($option)
        Returns the value of the corresponding option.

    $c->parse_error($file, $fmt, ...)
        Prints an error message and dies on syntax parse errors.

    $c->parse($fh, $description)
        Parse a control file from the given filehandle. Exits in case of errors. $description is
        used to describe the filehandle, ideally it's a filename or a description of where the data
        comes from. It's used in error messages. When called multiple times, the parsed fields are
        accumulated.

        Returns true if some fields have been parsed.

    $c->load($file)
        Parse the content of $file. Exits in case of errors. Returns true if some fields have been
        parsed.

    $c->find_custom_field($name)
        Scan the fields and look for a user specific field whose name matches the following regex:
        /X[SBC]*-$name/i. Return the name of the field found or undef if nothing has been found.

    $c->get_custom_field($name)
        Identify a user field and retrieve its value.

    $str = $c->output()
    "$c"
        Get a string representation of the control information. The fields are sorted in the order
        in which they have been read or set except if the order has been overridden with
        set_output_order().

    $c->output($fh)
        Print the string representation of the control information to a filehandle.

    $c->save($filename)
        Write the string representation of the control information to a file.

    $c->set_output_order(@fields)
        Define the order in which fields will be displayed in the output() method.

    $c->apply_substvars($substvars)
        Update all fields by replacing the variables references with the corresponding value stored
        in the Dpkg::Substvars object.

CHANGES
  Version 1.02 (dpkg 1.21.0)
    New option: "keep_duplicate" in new().

  Version 1.01 (dpkg 1.17.2)
    New method: $c->parse_error().

  Version 1.00 (dpkg 1.17.0)
    Mark the module as public.