/usr/share/guile-gnome-2/gnome/gobject/gparameter.scm is in guile-gnome2-glib 2.16.1-6ubuntu2.
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) 2001 Martin Baulig <martin@gnome.org>
;; Copyright (C) 2003,2004 Andy Wingo <wingo at pobox dot com>
;; 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:
;;
;; Parameters are constraints for values, both in type and in range.
;; This module wraps the parameters code of the GLib type system,
;; allowing parameters to be manipulated and created from Scheme.
;;
;; There is a parameter class for each type of parameter:
;; @code{<gparam-int>}, @code{<gparam-object>}, etc.
;;
;;; Code:
(define-module (gnome gobject gparameter)
#:use-module (oop goops)
#:use-module (gnome gobject config)
#:use-module (gnome gobject utils)
#:use-module (gnome gobject gtype)
#:use-module (gnome gobject gvalue)
#:export ( ;; GOOPS parameter base class
<gparam>
;; Parameter classes
<gparam-char> <gparam-uchar> <gparam-boolean> <gparam-int>
<gparam-uint> <gparam-long> <gparam-ulong> <gparam-int64>
<gparam-uint64> <gparam-float> <gparam-double>
<gparam-unichar> <gparam-pointer> <gparam-string>
<gparam-boxed> <gparam-enum> <gparam-flags>
;; Helper class
<gparam-spec-flags>
;; Limits
gparameter:uint-max gparameter:int-min gparameter:int-max
gparameter:ulong-max gparameter:long-min
gparameter:long-max gparameter:uint64-max
gparameter:int64-min gparameter:int64-max
gparameter:float-max gparameter:float-min
gparameter:double-max gparameter:double-min
gparameter:byte-order
))
(define-class-with-docs <gparam-spec-flags> (<gflags>)
"A @code{<gflags>} type for the flags allowable on a @code{<gparam>}:
@code{read}, @code{write}, @code{construct}, @code{construct-only}, and
@code{lax-validation}."
#:vtable
#((read "Readable" 1)
(write "Writable" 2)
(construct "Set on object construction" 4)
(construct-only "Only set on object construction" 8)
(lax-validation "Don't require strict validation on parameter conversion" 16)))
;; The C code needs to reference <gparam> for use in its predicates.
;; Define it now before loading the library.
(define-class <gparam-class> (<gtype-class>)
(value-type #:init-keyword #:value-type))
(define-method (compute-get-n-set (class <gparam-class>) s)
(case (slot-definition-allocation s)
((#:checked)
(let ((already-allocated (slot-ref class 'nfields))
(pred (get-keyword #:pred (slot-definition-options s) #f))
(trans (get-keyword #:trans (slot-definition-options s) #f)))
(or pred (gruntime-error "Missing #:pred for #:checked slot"))
;; allocate a field in the struct
(slot-set! class 'nfields (+ already-allocated 1))
;; struct-ref and struct-set! don't work on the structs that back
;; GOOPS objects, because they are "light structs", without the
;; hidden word that says how many fields are in the struct.
;; Patches submitted to guile-devel on 10 April 2008. Until then,
;; use our own struct accessors.
(list (lambda (instance)
(%hacky-struct-ref instance already-allocated))
(lambda (instance value)
(let ((value (if trans (trans value) value)))
(if (pred value)
(%hacky-struct-set! instance already-allocated value)
(gruntime-error
"Bad value for slot ~A on instance ~A: ~A"
(slot-definition-name s) instance value)))))))
(else (next-method))))
(define-class-with-docs <gparam> (<gtype-instance>)
"The base class for GLib parameter objects. (Doc slots)"
(name #:init-keyword #:name #:allocation #:checked #:pred symbol?)
(nick #:init-keyword #:nick #:allocation #:checked #:pred string?)
(blurb #:init-keyword #:blurb #:allocation #:checked #:pred string?)
(flags #:init-keyword #:flags #:init-value '(read write)
#:allocation #:checked #:pred number?
#:trans (lambda (x)
(apply + (gflags->value-list
(make <gparam-spec-flags> #:value x)))))
#:gtype-name "GParam"
#:metaclass <gparam-class>)
(dynamic-call "scm_init_gnome_gobject_parameters"
(dynamic-link *guile-gnome-gobject-lib-path*))
(define-class-with-docs <gparam-char> (<gparam>)
"Parameter for @code{<gchar>} values."
(minimum
#:init-keyword #:minimum #:init-value (integer->char 0)
#:allocation #:checked #:pred (lambda (x) (or (char? x) (integer? x))))
(maximum
#:init-keyword #:maximum #:init-value (integer->char 127)
#:allocation #:checked #:pred (lambda (x) (or (char? x) (integer? x))))
(default-value
#:init-keyword #:default-value #:init-value (integer->char 127)
#:allocation #:checked #:pred (lambda (x) (or (char? x) (integer? x))))
#:value-type <gchar>
#:gtype-name "GParamChar")
(define-class-with-docs <gparam-uchar> (<gparam>)
"Parameter for @code{<guchar>} values."
(minimum
#:init-keyword #:minimum #:init-value (integer->char 0)
#:allocation #:checked #:pred (lambda (x) (or (char? x) (integer? x))))
(maximum
#:init-keyword #:maximum #:init-value (integer->char 255)
#:allocation #:checked #:pred (lambda (x) (or (char? x) (integer? x))))
(default-value
#:init-keyword #:default-value #:init-value (integer->char 255)
#:allocation #:checked #:pred (lambda (x) (or (char? x) (integer? x))))
#:value-type <guchar>
#:gtype-name "GParamUChar")
(define-class-with-docs <gparam-boolean> (<gparam>)
"Parameter for @code{<gboolean>} values."
(default-value
#:init-keyword #:default-value #:init-value #f
#:allocation #:checked #:pred boolean?)
#:value-type <gboolean>
#:gtype-name "GParamBoolean")
(define-class-with-docs <gparam-int> (<gparam>)
"Parameter for @code{<gint>} values."
(minimum
#:init-keyword #:minimum #:init-value gparameter:int-min
#:allocation #:checked #:pred integer?)
(maximum
#:init-keyword #:maximum #:init-value gparameter:int-max
#:allocation #:checked #:pred integer?)
(default-value
#:init-keyword #:default-value #:init-value 0
#:allocation #:checked #:pred integer?)
#:value-type <gint>
#:gtype-name "GParamInt")
(define-class-with-docs <gparam-uint> (<gparam>)
"Parameter for @code{<guint>} values."
(minimum
#:init-keyword #:minimum #:init-value 0
#:allocation #:checked #:pred integer?)
(maximum
#:init-keyword #:maximum #:init-value gparameter:uint-max
#:allocation #:checked #:pred integer?)
(default-value
#:init-keyword #:default-value #:init-value 0
#:allocation #:checked #:pred integer?)
#:value-type <guint>
#:gtype-name "GParamUInt")
(define-class-with-docs <gparam-unichar> (<gparam>)
"Parameter for Unicode codepoints, represented as @code{<guint>}
values."
(default-value
#:init-keyword #:default-value #:init-value 0
#:allocation #:checked #:pred integer?)
#:value-type <guint>
#:gtype-name "GParamUnichar")
(define-class-with-docs <gparam-long> (<gparam>)
"Parameter for @code{<glong>} values."
(minimum
#:init-keyword #:minimum #:init-value gparameter:long-min
#:allocation #:checked #:pred integer?)
(maximum
#:init-keyword #:maximum #:init-value gparameter:long-max
#:allocation #:checked #:pred integer?)
(default-value
#:init-keyword #:default-value #:init-value 0
#:allocation #:checked #:pred integer?)
#:value-type <glong>
#:gtype-name "GParamLong")
(define-class-with-docs <gparam-ulong> (<gparam>)
"Parameter for @code{<gulong>} values."
(minimum
#:init-keyword #:minimum #:init-value 0
#:allocation #:checked #:pred integer?)
(maximum
#:init-keyword #:maximum #:init-value gparameter:ulong-max
#:allocation #:checked #:pred integer?)
(default-value
#:init-keyword #:default-value #:init-value 0
#:allocation #:checked #:pred integer?)
#:value-type <gulong>
#:gtype-name "GParamULong")
(define-class-with-docs <gparam-int64> (<gparam>)
"Parameter for @code{<gint64>} values."
(minimum
#:init-keyword #:minimum #:init-value gparameter:int64-min
#:allocation #:checked #:pred integer?)
(maximum
#:init-keyword #:maximum #:init-value gparameter:int64-max
#:allocation #:checked #:pred integer?)
(default-value
#:init-keyword #:default-value #:init-value 0
#:allocation #:checked #:pred integer?)
#:value-type <gint64>
#:gtype-name "GParamInt64")
(define-class-with-docs <gparam-uint64> (<gparam>)
"Parameter for @code{<guint64>} values."
(minimum
#:init-keyword #:minimum #:init-value 0
#:allocation #:checked #:pred integer?)
(maximum
#:init-keyword #:maximum #:init-value gparameter:uint64-max
#:allocation #:checked #:pred integer?)
(default-value
#:init-keyword #:default-value #:init-value 0
#:allocation #:checked #:pred integer?)
#:value-type <guint64>
#:gtype-name "GParamUInt64")
(define-class-with-docs <gparam-float> (<gparam>)
"Parameter for @code{<gfloat>} values."
(minimum
#:init-keyword #:minimum #:init-value (- gparameter:float-max)
#:allocation #:checked #:pred real?)
(maximum
#:init-keyword #:maximum #:init-value gparameter:float-max
#:allocation #:checked #:pred real?)
(default-value
#:init-keyword #:default-value #:init-value 0.0
#:allocation #:checked #:pred real?)
#:value-type <gfloat>
#:gtype-name "GParamFloat")
(define-class-with-docs <gparam-double> (<gparam>)
"Parameter for @code{<gdouble>} values."
(minimum
#:init-keyword #:minimum #:init-value (- gparameter:double-max)
#:allocation #:checked #:pred real?)
(maximum
#:init-keyword #:maximum #:init-value gparameter:double-max
#:allocation #:checked #:pred real?)
(default-value
#:init-keyword #:default-value #:init-value 0.0
#:allocation #:checked #:pred real?)
#:value-type <gdouble>
#:gtype-name "GParamDouble")
(define-class-with-docs <gparam-pointer> (<gparam>)
"Parameter for @code{<gpointer>} values."
#:value-type <gpointer>
#:gtype-name "GParamPointer")
(define-class-with-docs <gparam-string> (<gparam>)
"Parameter for @code{<gchararray>} values."
(default-value
#:init-keyword #:default-value #:init-value ""
#:allocation #:checked #:pred (lambda (x) (or (not x) (string? x))))
#:value-type <gchararray>
#:gtype-name "GParamString")
(define (class-is-a? x is-a)
(memq is-a (class-precedence-list x)))
(define-class-with-docs <gparam-boxed> (<gparam>)
"Parameter for @code{<gboxed>} values."
(boxed-type
#:init-keyword #:boxed-type #:allocation #:checked
#:pred (lambda (x) (class-is-a? x <gboxed>)))
#:value-type <gboxed>
#:gtype-name "GParamBoxed")
(define-class-with-docs <gparam-enum> (<gparam>)
"Parameter for @code{<genum>} values."
(enum-type
#:init-keyword #:enum-type #:allocation #:checked
#:pred (lambda (x) (class-is-a? x <genum>)))
(default-value
#:init-keyword #:default-value #:init-value 0
#:allocation #:checked #:pred number?)
#:value-type <genum>
#:gtype-name "GParamEnum")
(define-class-with-docs <gparam-flags> (<gparam>)
"Parameter for @code{<gflags>} values."
(flags-type
#:init-keyword #:flags-type #:allocation #:checked
#:pred (lambda (x) (class-is-a? x <gflags>)))
(default-value
#:init-keyword #:default-value #:init-value 0
#:allocation #:checked #:pred number?)
#:value-type <gflags>
#:gtype-name "GParamFlags")
(define-class-with-docs <gparam-value-array> (<gparam>)
"Parameter for @code{<gvalue-array>} values."
(element-spec
#:init-keyword #:element-spec #:allocation #:checked
#:pred (lambda (x) (or (not x) (is-a? x <gparam>))))
#:value-type <gvalue-array>
#:gtype-name "GParamValueArray")
;;;
;;; {Instance Initialization}
;;;
;; fixme, make me more useful
(define-method (write (param <gparam>) file)
(let ((class (class-of param))
(loc (number->string (object-address param) 16)))
(if (slot-bound? class 'name)
(with-accessors (name)
(format file "<~a ~a ~a>" (class-name class) (name param) loc))
(format file "<~a (uninitialized) ~a>" (class-name class) loc))))
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