mdw@git.distorted.org.uk Git - clg/blob - glib/gtype.lisp

   1 ;; Common Lisp bindings for GTK+ v2.0
   2 ;; Copyright (C) 2000-2001 Espen S. Johnsen <esj@stud.cs.uit.no>
   3 ;;
   4 ;; This library is free software; you can redistribute it and/or
   5 ;; modify it under the terms of the GNU Lesser General Public
   6 ;; License as published by the Free Software Foundation; either
   7 ;; version 2 of the License, or (at your option) any later version.
   8 ;;
   9 ;; This library is distributed in the hope that it will be useful,
  10 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 ;; Lesser General Public License for more details.
  13 ;;
  14 ;; You should have received a copy of the GNU Lesser General Public
  15 ;; License along with this library; if not, write to the Free Software
  16 ;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17
  18 ;; $Id: gtype.lisp,v 1.26 2005-02-10 00:20:02 espen Exp $
  19
  20 (in-package "GLIB")
  21
  22 (use-prefix "g")
  23
  24 ;; Initialize the glib type system
  25 (defbinding type-init () nil)
  26 (type-init)
  27
  28 (deftype type-number () '(unsigned 32))
  29
  30 (deftype gtype () 'symbol)
  31
  32 (defmethod alien-type ((type (eql 'gtype)) &rest args)
  33   (declare (ignore type args))
  34   (alien-type 'type-number))
  35
  36 (defmethod size-of ((type (eql 'gtype)) &rest args)
  37   (declare (ignore type args))
  38   (size-of 'type-number))
  39
  40 (defmethod to-alien-form (gtype (type (eql 'gtype)) &rest args)
  41   (declare (ignore type args))
  42   `(find-type-number ,gtype t))
  43
  44 (defmethod to-alien-function ((type (eql 'gtype)) &rest args)
  45   (declare (ignore type args))
  46   #'(lambda (gtype)
  47       (find-type-number gtype t)))
  48
  49 (defmethod from-alien-form (type-number (type (eql 'gtype)) &rest args)
  50   (declare (ignore type args))
  51   `(type-from-number ,type-number))
  52
  53 (defmethod from-alien-function ((type (eql 'gtype)) &rest args)
  54   (declare (ignore type args))
  55   #'(lambda (type-number)
  56       (type-from-number type-number)))
  57
  58 (defmethod writer-function ((type (eql 'gtype)) &rest args)
  59   (declare (ignore type args))
  60   (let ((writer (writer-function 'type-number)))
  61     #'(lambda (gtype location &optional (offset 0))
  62         (funcall writer (find-type-number gtype t) location offset))))
  63
  64 (defmethod reader-function ((type (eql 'gtype)) &rest args)
  65   (declare (ignore type args))
  66   (let ((reader (reader-function 'type-number)))
  67     #'(lambda (location &optional (offset 0))
  68         (type-from-number (funcall reader location offset)))))
  69
  70
  71 (eval-when (:compile-toplevel :load-toplevel :execute)
  72   (defclass type-query (struct)
  73     ((type-number :allocation :alien :type type-number)
  74      (name :allocation :alien :type string)
  75      (class-size :allocation :alien :type unsigned-int)
  76      (instance-size :allocation :alien :type unsigned-int))
  77     (:metaclass struct-class)))
  78
  79
  80 (defbinding type-query (type) nil
  81   ((find-type-number type t) type-number)
  82   ((make-instance 'type-query) type-query :return))
  83
  84 (defun type-instance-size (type)
  85   (slot-value (type-query type) 'instance-size))
  86
  87 (defun type-class-size (type)
  88   (slot-value (type-query type) 'class-size))
  89
  90 (defbinding type-class-ref (type) pointer
  91   ((find-type-number type t) type-number))
  92
  93 (defbinding type-class-unref (type) nil
  94   ((find-type-number type t) type-number))
  95
  96 (defbinding type-class-peek (type) pointer
  97   ((find-type-number type t) type-number))
  98
  99
 100 ;;;; Mapping between lisp types and glib types
 101
 102 (defvar *type-to-number-hash* (make-hash-table))
 103 (defvar *number-to-type-hash* (make-hash-table))
 104
 105 (defun register-type (type id)
 106   (let ((type-number
 107          (etypecase id
 108            (integer id)
 109            (string (find-type-number id t))
 110            (symbol (gethash id *type-to-number-hash*)))))
 111     (setf (gethash type *type-to-number-hash*) type-number)
 112     (unless (symbolp id)
 113       (setf (gethash type-number *number-to-type-hash*) type))
 114     type-number))
 115
 116 (defbinding %type-from-name () type-number
 117   (name string))
 118
 119 (defun find-type-number (type &optional error)
 120   (etypecase type
 121     (integer type)
 122     (string
 123      (let ((type-number (%type-from-name type)))
 124        (cond
 125         ((and (zerop type-number) error)
 126          (error "Invalid gtype name: ~A" type))
 127         ((zerop type-number) nil)
 128         (t type-number))))
 129     (symbol
 130      (let ((type-number (gethash type *type-to-number-hash*)))
 131        (or
 132         type-number
 133         (and error (error "Type not registered: ~A" type)))))
 134     (class (find-type-number (class-name type) error))))
 135
 136 (defun type-from-number (type-number &optional error)
 137   (multiple-value-bind (type found)
 138       (gethash type-number *number-to-type-hash*)
 139     (when (and error (not found))
 140       (let ((name (find-type-name type-number)))
 141         (if name
 142             (error "Type number not registered: ~A (~A)" type-number name)
 143           (error "Invalid type number: ~A" type-number))))
 144     type))
 145
 146 (defun type-from-name (name)
 147   (etypecase name
 148     (string (type-from-number (find-type-number name t)))))
 149
 150 (defbinding (find-type-name "g_type_name") (type) (copy-of string)
 151   ((find-type-number type t) type-number))
 152
 153 (defun type-number-of (object)
 154   (find-type-number (type-of object) t))
 155
 156 (eval-when (:compile-toplevel :load-toplevel :execute)
 157   (defun %find-types-in-library (pathname prefix ignore)
 158     (let ((process (run-program
 159                     "/usr/bin/nm" (list "--defined-only" "-D" (namestring (truename pathname)))
 160                     :output :stream :wait nil)))
 161       (unwind-protect
 162           (loop
 163            as symbol = (let ((line (read-line (process-output process) nil)))
 164                          (when line (subseq line 11)))
 165            while symbol
 166            when (and
 167                  (> (length symbol) (length prefix))
 168                  (string= prefix symbol :end2 (length prefix))
 169                  (search "_get_type" symbol)
 170                  (not (member symbol ignore :test #'string=)))
 171            collect symbol)
 172         (process-close process)))))
 173
 174
 175 (defmacro init-types-in-library (filename &key (prefix "") ignore)
 176   (let ((names (%find-types-in-library filename prefix ignore)))
 177     `(progn
 178        ,@(mapcar #'(lambda (name)
 179                      `(progn
 180                         (defbinding (,(intern name) ,name) () type-number)
 181                         (,(intern name))))
 182                  names))))
 183
 184
 185
 186 ;;;; Metaclass for subclasses of ginstance
 187
 188 (eval-when (:compile-toplevel :load-toplevel :execute)
 189   (defclass ginstance-class (proxy-class)
 190     ()))
 191
 192
 193 (defmethod shared-initialize ((class ginstance-class) names
 194                               &rest initargs &key name alien-name)
 195   (declare (ignore names))
 196   (let* ((class-name (or name (class-name class)))
 197          (type-number
 198           (find-type-number
 199            (or (first alien-name) (default-alien-type-name class-name)) t)))
 200     (register-type class-name type-number)
 201     (if (getf initargs :size)
 202         (call-next-method)
 203       (let ((size (type-instance-size type-number)))
 204         (apply #'call-next-method class names :size (list size) initargs)))))
 205
 206
 207 (defmethod validate-superclass ((class ginstance-class) (super standard-class))
 208   (subtypep (class-name super) 'ginstance))
 209
 210
 211 ;;;; Superclass for wrapping types in the glib type system
 212
 213 (eval-when (:compile-toplevel :load-toplevel :execute)
 214   (defclass ginstance (proxy)
 215     ((class :allocation :alien :type pointer))
 216     (:metaclass proxy-class)))
 217
 218 (defun %type-of-ginstance (location)
 219   (let ((class (sap-ref-sap location 0)))
 220     (type-from-number (sap-ref-32 class 0))))
 221
 222 (defmethod ensure-proxy-instance ((class ginstance-class) location)
 223   (declare (ignore class))
 224   (let ((class (find-class (%type-of-ginstance location))))
 225     (if class
 226         (make-instance class :location (reference-foreign class location))
 227       ;; TODO: (make-instance 'ginstance ...)
 228       location)))
 229
 230 (defmethod copy-from-alien-form (location (class ginstance-class) &rest args)
 231   (declare (ignore location class args))
 232   (error "Doing copy-from-alien on a ref. counted class is most certainly an error, but if it really is what you want you should use REFERENCE-FOREIGN on the returned instance instead."))
 233
 234 (defmethod copy-from-alien-function ((class ginstance-class) &rest args)
 235   (declare (ignore class args))
 236   (error "Doing copy-from-alien on a ref. counted class is most certainly an error, but if it really is what you want you should use REFERENCE-FOREIGN on the returned instance instead."))
 237
 238 (defmethod reader-function ((class ginstance-class) &rest args)
 239   (declare (ignore args))
 240   #'(lambda (location &optional (offset 0))
 241       (ensure-proxy-instance class (sap-ref-sap location offset))))
 242
 243
 244 ;;;; Registering fundamental types
 245
 246 (register-type 'nil "void")
 247 (register-type 'pointer "gpointer")
 248 (register-type 'char "gchar")
 249 (register-type 'unsigned-char "guchar")
 250 (register-type 'boolean "gboolean")
 251 (register-type 'fixnum "gint")
 252 (register-type 'int "gint")
 253 (register-type 'unsigned-int "guint")
 254 (register-type 'long "glong")
 255 (register-type 'unsigned-long "gulong")
 256 (register-type 'single-float "gfloat")
 257 (register-type 'double-float "gdouble")
 258 (register-type 'pathname "gchararray")
 259 (register-type 'string "gchararray")
 260
 261
 262 ;;;; Introspection of type information
 263
 264 (defvar *derivable-type-info* (make-hash-table))
 265
 266 (defun register-derivable-type (type id expander &optional dependencies)
 267   (register-type type id)
 268   (let ((type-number (register-type type id)))
 269     (setf
 270      (gethash type-number *derivable-type-info*)
 271      (list expander dependencies))))
 272
 273 (defun find-type-info (type)
 274   (dolist (super (cdr (type-hierarchy type)))
 275     (let ((info (gethash super *derivable-type-info*)))
 276       (return-if info))))
 277
 278 (defun expand-type-definition (type forward-p options)
 279   (let ((expander (first (find-type-info type))))
 280     (funcall expander (find-type-number type t) forward-p options)))
 281
 282 (defbinding type-parent (type) type-number
 283   ((find-type-number type t) type-number))
 284
 285 (defun supertype (type)
 286   (type-from-number (type-parent type)))
 287
 288 (defbinding %type-interfaces (type) pointer
 289   ((find-type-number type t) type-number)
 290   (n-interfaces unsigned-int :out))
 291
 292 (defun type-interfaces (type)
 293   (multiple-value-bind (array length) (%type-interfaces type)
 294     (unwind-protect
 295         (map-c-vector 'list #'identity array 'type-number length)
 296       (deallocate-memory array))))
 297
 298 (defun implements (type)
 299   (mapcar #'type-from-number (type-interfaces type)))
 300
 301 (defun type-hierarchy (type)
 302   (let ((type-number (find-type-number type t)))
 303     (unless (= type-number 0)
 304       (cons type-number (type-hierarchy (type-parent type-number))))))
 305
 306 (defbinding (type-is-p "g_type_is_a") (type super) boolean
 307   ((find-type-number type) type-number)
 308   ((find-type-number super) type-number))
 309
 310 (defbinding %type-children () pointer
 311   (type-number type-number)
 312   (num-children unsigned-int :out))
 313
 314 (defun map-subtypes (function type &optional prefix)
 315   (let ((type-number (find-type-number type t)))
 316     (multiple-value-bind (array length) (%type-children type-number)
 317       (unwind-protect
 318           (map-c-vector
 319            'nil
 320            #'(lambda (type-number)
 321                (when (or
 322                       (not prefix)
 323                       (string-prefix-p prefix (find-type-name type-number)))
 324                  (funcall function type-number))
 325                (map-subtypes function type-number prefix))
 326            array 'type-number length)
 327         (deallocate-memory array)))))
 328
 329 (defun find-types (prefix)
 330   (let ((type-list nil))
 331     (maphash
 332      #'(lambda (type-number expander)
 333          (declare (ignore expander))
 334          (map-subtypes
 335           #'(lambda (type-number)
 336               (pushnew type-number type-list))
 337           type-number prefix))
 338      *derivable-type-info*)
 339     type-list))
 340
 341 (defun find-type-dependencies (type)
 342   (let ((list-dependencies (second (find-type-info type))))
 343     (when list-dependencies
 344       (funcall list-dependencies (find-type-number type t)))))
 345
 346 (defun %sort-types-topologicaly (types)
 347   (let ((partial-sorted
 348          (sort
 349           (mapcar
 350            #'(lambda (type)
 351                (cons type (remove-if #'(lambda (dep)
 352                                          (not (find dep types)))
 353                                      (find-type-dependencies type))))
 354            types)
 355           #'(lambda (type1 type2) (type-is-p type2 type1)) :key #'car))
 356         (sorted ()))
 357
 358     (loop
 359      as tmp = partial-sorted then (or (rest tmp) partial-sorted)
 360      while tmp
 361      do (destructuring-bind (type . dependencies) (first tmp)
 362           (cond
 363            ((every #'(lambda (dep)
 364                        (assoc dep sorted))
 365                    dependencies)
 366             (push (cons type nil) sorted) ; no forward definition needed
 367             (setq partial-sorted (delete type partial-sorted :key #'first)))
 368            ((some #'(lambda (dep)
 369                       (find type (find-type-dependencies dep)))
 370                   dependencies)
 371             (push (cons type t) sorted) ; forward definition needed
 372             (setq partial-sorted (delete type partial-sorted :key #'first))))))
 373     (nreverse sorted)))
 374
 375
 376 (defun expand-type-definitions (prefix &optional args)
 377  (flet ((type-options (type-number)
 378            (let ((name (find-type-name type-number)))
 379              (cdr (assoc name args :test #'string=)))))
 380
 381    (let ((type-list
 382           (delete-if
 383            #'(lambda (type-number)
 384                (let ((name (find-type-name type-number)))
 385                  (or
 386                   (getf (type-options type-number) :ignore)
 387                   (find-if
 388                    #'(lambda (options)
 389                        (and
 390                         (string-prefix-p (first options) name)
 391                         (getf (cdr options) :ignore-prefix)
 392                         (not (some
 393                               #'(lambda (exception)
 394                                   (string= name exception))
 395                               (getf (cdr options) :except)))))
 396                    args))))
 397            (find-types prefix))))
 398
 399      (dolist (type-number type-list)
 400        (let ((name (find-type-name type-number)))
 401          (register-type
 402           (getf (type-options type-number) :type (default-type-name name))
 403           type-number)))
 404
 405      (let ((sorted-type-list (%sort-types-topologicaly type-list)))
 406        `(progn
 407           ,@(mapcar
 408              #'(lambda (pair)
 409                  (destructuring-bind (type . forward-p) pair
 410                    (expand-type-definition type forward-p (type-options type))))
 411              sorted-type-list)
 412           ,@(mapcar
 413              #'(lambda (pair)
 414                  (destructuring-bind (type . forward-p) pair
 415                    (when forward-p
 416                      (expand-type-definition type nil (type-options type)))))
 417              sorted-type-list))))))
 418
 419 (defmacro define-types-by-introspection (prefix &rest args)
 420   (expand-type-definitions prefix args))
 421
 422
 423 ;;;; Initialize all non static types in GObject
 424
 425 (init-types-in-library #.(concatenate 'string (pkg-config:pkg-variable "glib-2.0" "libdir") "/libgobject-2.0.so"))