NAME

       Dpkg::Control::FieldsCore - manage (list of official) control fields

DESCRIPTION

       The modules contains a list of fieldnames with associated meta-data explaining in which
       type of control information they are allowed. The types are the CTRL_* constants exported
       by Dpkg::Control.

FUNCTIONS

       my $f = field_capitalize($field_name)
           Returns the field name properly capitalized. All characters are lowercase, except the
           first of each word (words are separated by a hyphen in field names).

       field_is_official($fname)
           Returns true if the field is official and known.

       field_is_allowed_in($fname, @types)
           Returns true (1) if the field $fname is allowed in all the types listed in the list.
           Note that you can use type sets instead of individual types (ex: CTRL_FILE_CHANGES |
           CTRL_CHANGELOG).

           field_allowed_in(A|B, C) returns true only if the field is allowed in C and either A
           or B.

           Undef is returned for non-official fields.

       field_transfer_single($from, $to, $field)
           If appropriate, copy the value of the field named $field taken from the $from
           Dpkg::Control object to the $to Dpkg::Control object.

           Official fields are copied only if the field is allowed in both types of objects.
           Custom fields are treated in a specific manner. When the target is not among
           CTRL_PKG_SRC, CTRL_PKG_DEB or CTRL_FILE_CHANGES, then they are alway copied as is (the
           X- prefix is kept). Otherwise they are not copied except if the target object matches
           the target destination encoded in the field name. The initial X denoting custom fields
           can be followed by one or more letters among "S" (Source: corresponds to
           CTRL_PKG_SRC), "B" (Binary: corresponds to CTRL_PKG_DEB) or "C" (Changes: corresponds
           to CTRL_FILE_CHANGES).

           Returns undef if nothing has been copied or the name of the new field added to $to
           otherwise.

       field_transfer_all($from, $to)
           Transfer all appropriate fields from $from to $to. Calls field_transfer_single() on
           all fields available in $from.

           Returns the list of fields that have been added to $to.

       field_ordered_list($type)
           Returns an ordered list of fields for a given type of control information.  This list
           can be used to output the fields in a predictable order.  The list might be empty for
           types where the order does not matter much.

       field_list_src_dep()
           List of fields that contains dependencies-like information in a source Debian package.

       field_list_pkg_dep()
           List of fields that contains dependencies-like information in a binary Debian package.
           The fields that express real dependencies are sorted from the stronger to the weaker.

       field_get_dep_type($field)
           Return the type of the dependency expressed by the given field. Can either be "normal"
           for a real dependency field (Pre-Depends, Depends, ...)  or "union" for other relation
           fields sharing the same syntax (Conflicts, Breaks, ...). Returns undef for fields
           which are not dependencies.

       field_get_sep_type($field)
           Return the type of the field value separator. Can be one of FIELD_SEP_UNKNOWN,
           FIELD_SEP_SPACE, FIELD_SEP_COMMA or FIELD_SEP_LINE.

       field_register($field, $allowed_types, %opts)
           Register a new field as being allowed in control information of specified types. %opts
           is optional

       field_insert_after($type, $ref, @fields)
           Place field after another one ($ref) in output of control information of type $type.

       field_insert_before($type, $ref, @fields)
           Place field before another one ($ref) in output of control information of type $type.

AUTHOR

       Raphaël Hertzog <hertzog@debian.org>.