Dpkg::Control::FieldsCore man page on ElementaryOS

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Dpkg::Control::FieldsCore(3)	 libdpkg-perl	  Dpkg::Control::FieldsCore(3)

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

       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.

       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).

	   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

	   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.

	   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.

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

	   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.

	   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.

	   Return the type of the field value separator. Can be one of

       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.

       Raphaƫl Hertzog <hertzog@debian.org>.

1.17.5				  2013-12-10	  Dpkg::Control::FieldsCore(3)

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