/usr/share/guile-gnome-2/gnome/gobject/gobject.scm is in guile-gnome2-glib 2.16.4-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;; Copyright (C) 2003,2004,2015 Andy Wingo <wingo at pobox dot com>
;; Copyright (C) 2001 Martin Baulig <martin@gnome.org>
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2 of
;; the License, or (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 59 Temple Place - Suite 330 Fax: +1-617-542-2652
;; Boston, MA 02111-1307, USA gnu@gnu.org
;;; Commentary:
;;
;; GObject is what is commonly understood as @emph{the} object system
;; for GLib. This is not strictly true. GObject is @emph{one}
;; implementation of an object system, built on the other modules:
;; GType, GValue, GParameter, GClosure, and GSignal.
;;
;; Similarly, this Guile module provides integration with the GObject
;; object system, built on the Guile modules that support GType, GValue,
;; GParameter, GClosure, and GSignal.
;;
;; The main class exported by this module is @code{<gobject>}.
;; @code{<gobject>} classes can be subclassed by the user, which will
;; register new subtypes with the GType runtime type system.
;; @code{<gobject>} classes are are also created as needed when wrapping
;; GObjects that come from C, for example from a function's return
;; value.
;;
;; Besides supporting derivation, and signals like other
;; @code{<gtype-instance>} implementations, @code{<gobject>} has the
;; concept of @dfn{properties}, which are @code{<gvalue>}'s associated
;; with the object. The values are constrained by @code{<gparam>}'s,
;; which are associated with the object's class. This module exports the
;; necessary routines to query, get, and set @code{<gobject>}
;; properties.
;;
;; In addition, this module defines the @code{<ginterface>} base class,
;; whose subclasses may be present as mixins of @code{<gobject>}
;; classes. For example:
;;
;; @lisp
;; (use-modules (gnome gtk) (oop goops))
;; (class-direct-supers <gtk-widget>) @result{}
;; (#<<gobject-class> <atk-implementor-iface> 3033bad0>
;; #<<gobject-class> <gtk-object> 3034bc90>)
;; @end lisp
;;
;; In this example, we see that @code{<gtk-widget>} has two
;; superclasses, @code{<gtk-object>} and @code{<atk-implementor-iface>}.
;; The second is an interface implemented by the @code{<gtk-widget>}
;; class. See @code{gtype-interfaces} for more details.
;;
;;; Code:
(define-module (gnome gobject gobject)
#:use-module ((srfi srfi-1) #:select (filter-map))
#:use-module (oop goops)
#:use-module (gnome gobject utils)
#:use-module (gnome gobject config)
#:use-module (gnome gobject gtype)
#:use-module (gnome gobject gvalue)
#:use-module (gnome gobject gparameter)
#:use-module (gnome gobject gsignal)
#:export (;; Classes
<gobject> <ginterface> <gparam-object>
;; Low-level subclassing
gtype-register-static
;; Methods to override
gobject:get-property gobject:set-property
;; Properties
gobject-class-get-properties gobject-class-find-property
gobject-class-get-property-names
gobject-get-property gobject-set-property))
(eval-when (expand load eval)
(dynamic-call "scm_init_gnome_gobject"
(dynamic-link *guile-gnome-gobject-lib-path*)))
;;;
;;; {Class Initialization}
;;;
(define-class <gobject-class> (<gtype-class>))
(define-method (compute-slots (class <gobject-class>))
(define (has-slot? name slots)
(and (pair? slots)
(or (eq? name (slot-definition-name (car slots)))
(has-slot? name (cdr slots)))))
(define (compute-extra-slots props slots)
(filter-map (lambda (prop)
(and (not (has-slot? prop slots))
(if (defined? '<slot>)
(make <slot> #:name prop #:allocation #:gproperty)
`(,prop #:allocation #:gproperty))))
props))
(let* ((slots (next-method))
(extra (compute-extra-slots
(gobject-class-get-property-names class) slots)))
(with-accessors (direct-slots)
(set! (direct-slots class) (append (direct-slots class) extra)))
(append slots extra)))
(define-method (compute-get-n-set (class <gobject-class>) slotdef)
(let ((name (slot-definition-name slotdef)))
(case (slot-definition-allocation slotdef)
((#:gproperty) (list (lambda (o) (gobject-get-property o name))
(lambda (o v) (gobject-set-property o name v))))
(else (next-method)))))
(define-method (initialize (class <gobject-class>) initargs)
(define (install-properties!)
;; To expose slots as gobject properties, <gobject> will process a
;; #:gparam slot option to create a new gobject property.
(for-each
(lambda (slot)
(let ((pspec (get-keyword #:gparam (slot-definition-options slot) #f)))
(if pspec
(gobject-class-install-property
class
(apply make
(car pspec) #:name (slot-definition-name slot)
(cdr pspec))))))
(class-direct-slots class)))
(define (install-signals!)
;; We parse a #:gsignal initialization argument to install signals.
(let loop ((args initargs))
(if (not (null? args))
(begin
(if (eq? (car args) #:gsignal)
(let ((signal (cadr args)))
(if (not (and (list? signal) (>= (length signal) 2)))
(gruntime-error "Invalid signal specification: ~A" signal))
(let* ((name (car signal))
(return-type (cadr signal))
(param-types (cddr signal))
(generic (gtype-class-create-signal class name return-type param-types)))
;; Some magic to define the generic
(module-define! (current-module)
(generic-function-name generic) generic))))
(loop (cddr args))))))
(define (first pred list)
(cond ((null? list) #f)
((pred (car list)) (car list))
(else (first pred (cdr list)))))
(define (gobject-class? c)
(memq <gobject> (class-precedence-list c)))
;; real work starts here
(next-method
class
(cons*
#:gtype-name
(or (get-keyword #:gtype-name initargs #f)
(gtype-register-static
(class-name->gtype-name (get-keyword #:name initargs #f))
(first gobject-class?
(apply append
(map class-precedence-list
(get-keyword #:dsupers initargs '()))))))
initargs))
(install-properties!)
(install-signals!))
(define-class-with-docs <gobject> (<gtype-instance>)
"The base class for GLib's default object system.
@code{<gobject>}'s metaclass understands a new slot option,
@code{#:gparam}, which will export a slot as a @code{<gobject>}
property. The default implementation will set and access the value from
the slot, but you can customize this by writing your own methods for
@code{gobject:set-property} and @code{gobject:get-property}.
In addition, the metaclass also understands @code{#:gsignal} arguments,
which define signals on the class, and define the generics for the
default signal handler. See @code{gtype-class-define-signal} for more
information.
For example:
@lisp
;; deriving from <gobject>
(define-class <test> (<gobject>)
;; a normal object slot
my-data
;; an object slot exported as a gobject property
(pub-data #:gparam (list <gparam-long> #:name 'test))
;; likewise, using non-default parameter settings
(foo-data #:gparam (list <gparam-long> #:name 'foo
#:minimum -3 #:maximum 1000
#:default-value 42))
;; a signal with no arguments and no return value
#:gsignal '(frobate #f)
;; a signal with arguments and a return value
#:gsignal (list 'frobate <gboolean> <gint> <glong>))
;; deriving from <test> -- also inherits properties and signals
(define-class <hungry> (<test>))
@end lisp
@code{<gobject>} classes also expose a slot for each GObject property
defined on the class, if such a slot is not already defined.
"
;; add a slot for signal generics instead of module-define! ?
#:metaclass <gobject-class>
#:gtype-name "GObject")
(define-class-with-docs <ginterface> (<gtype-instance>)
"The base class for GLib's interface types. Not derivable in Scheme."
#:metaclass <gobject-class>
#:gtype-name "GInterface")
(define (class-is-a? x is-a)
(memq is-a (class-precedence-list x)))
(define-class-with-docs <gparam-object> (<gparam>)
"Parameter for @code{<gobject>} values."
(object-type
#:init-keyword #:object-type #:allocation #:checked
#:pred (lambda (x) (is-a? x <gobject-class>)))
#:value-type <gobject>
#:gtype-name "GParamObject")
;;;
;;; {GObject Properties}
;;;
(define (gobject-class-find-property class name)
"Returns a property named @var{name} (a symbol), belonging to
@var{class} or one of its parent classes, or @code{#f} if not found."
(let ((propname name))
(with-accessors (name)
(let lp ((props (gobject-class-get-properties class)))
(cond ((null? props) #f)
((eq? (name (car props)) propname) (car props))
(else (lp (cdr props))))))))
(define-generic-with-docs gobject:set-property
"Called to set a gobject property. Only properties directly belonging
to the object's class will come through this function; superclasses
handle their own properties.
Takes three arguments: the object, the property name, and the value.
Call @code{(next-method)} in your methods to invoke the default handler.")
(define-method (gobject:set-property (object <gobject>) (name <symbol>) value)
"The default implementation of @code{gobject:set-property}, which sets
slots on the object."
(if (class-slot-definition (class-of object) name)
(slot-set! object name value)
(gruntime-error "Properties added after object definition must be accessed via custom property methods: ~A" name)))
(define-generic-with-docs gobject:get-property
"Called to get a gobject property. Only properties directly belonging
to the object's class will come through this function; superclasses
handle their own properties.
Takes two arguments: the object and the property name.
Call @code{(next-method)} in your methods to invoke the default handler")
(define-method (gobject:get-property (object <gobject>) (name <symbol>))
"The default implementation of @code{gobject:get-property}, which
calls @code{(slot-ref obj name)}."
(if (class-slot-definition (class-of object) name)
(slot-ref object name)
(gruntime-error "Properties added after object definition must be accessed via custom property methods: ~A" name)))
(eval-when (load eval)
(%gnome-gobject-object-post-init))
|