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 1.12 2001-10-21 21:50:18 espen Exp $
  19
  20 (in-package "GLIB")
  21
  22 (use-prefix "g")
  23
  24 ;;;;
  25
  26 (deftype type-number () '(unsigned 32))
  27
  28 (eval-when (:compile-toplevel :load-toplevel :execute)
  29   (defclass type-query (struct)
  30     ((type-number :allocation :alien :type type-number)
  31      (name :allocation :alien :type string)
  32      (class-size :allocation :alien :type unsigned-int)
  33      (instance-size :allocation :alien :type unsigned-int))
  34     (:metaclass proxy-class)))
  35
  36
  37 (defbinding %type-query () nil
  38   (type type-number)
  39   (query type-query))
  40
  41 (defun type-query (type)
  42   (let ((query (make-instance 'type-query)))
  43     (%type-query (find-type-number type t) query)
  44     query))
  45
  46 (defun type-instance-size (type)
  47   (slot-value (type-query type) 'instance-size))
  48
  49 (defun type-class-size (type)
  50   (slot-value (type-query type) 'class-size))
  51
  52 (defbinding type-class-ref (type) pointer
  53   ((find-type-number type t) type-number))
  54
  55 (defbinding type-class-unref (type) nil
  56   ((find-type-number type t) type-number))
  57
  58 (defbinding type-class-peek (type) pointer
  59   ((find-type-number type t) type-number))
  60
  61
  62 ;;;; Mapping between lisp types and glib types
  63
  64 (defvar *type-to-number-hash* (make-hash-table))
  65 (defvar *number-to-type-hash* (make-hash-table))
  66
  67 (defun register-type (type id)
  68   (let ((type-number
  69          (etypecase id
  70            (integer id)
  71            (string (find-type-number id t)))))
  72     (setf (gethash type *type-to-number-hash*) type-number)
  73     (setf (gethash type-number *number-to-type-hash*) type)
  74     type-number))
  75
  76 (defbinding %type-from-name () type-number
  77   (name string))
  78
  79 (defun find-type-number (type &optional error)
  80   (etypecase type
  81     (integer type)
  82     (string
  83      (let ((type-number (%type-from-name type)))
  84        (cond
  85         ((and (zerop type-number) error)
  86          (error "Invalid alien type name: ~A" type))
  87         ((zerop type-number) nil)
  88         (t type-number))))
  89     (symbol
  90      (let ((type-number (gethash type *type-to-number-hash*)))
  91        (or
  92         type-number
  93         (and error (error "Type not registered: ~A" type)))))
  94     (pcl::class (find-type-number (class-name type) error))))
  95
  96 (defun type-from-number (type-number &optional error)
  97   (multiple-value-bind (type found)
  98       (gethash type-number *number-to-type-hash*)
  99     (when (and error (not found))
 100       (let ((name (find-type-name type-number)))
 101         (if name
 102             (error "Type number not registered: ~A (~A)" type-number name)
 103           (error "Invalid type number: ~A" type-number))))
 104     type))
 105
 106 (defun type-from-name (name)
 107   (etypecase name
 108     (string (type-from-number (find-type-number name t)))))
 109
 110 (defbinding (find-type-name "g_type_name") (type) string
 111   ((find-type-number type t) type-number))
 112
 113 (defun type-number-of (object)
 114   (find-type-number (type-of object) t))
 115
 116 (defun init-type (init)
 117   (mapc
 118    #'(lambda (fname)
 119        (funcall (mkbinding fname 'type-number)))
 120    (mklist init)))
 121
 122 (defun %init-types-in-library (pathname ignore)
 123   (let ((process (ext:run-program
 124                   "nm" (list (namestring (truename pathname)))
 125                   :output :stream :wait nil))
 126         (fnames ()))
 127     (labels ((read-symbols ()
 128                (let ((line (read-line (ext:process-output process) nil)))
 129                  (when line
 130                    (let ((symbol (subseq line 11)))
 131                      (when (and
 132                             (search "_get_type" symbol)
 133                             (not (member symbol ignore :test #'string=)))
 134                        (push symbol fnames)))
 135                    (read-symbols)))))
 136       (read-symbols)
 137       (ext:process-close process)
 138       `(init-type ',fnames))))
 139
 140 (defmacro init-types-in-library (pathname &key ignore)
 141   (%init-types-in-library pathname ignore))
 142
 143
 144
 145 ;;;; Superclass for wrapping types in the glib type system
 146
 147 (eval-when (:compile-toplevel :load-toplevel :execute)
 148   (defclass ginstance (proxy)
 149     ((class :allocation :alien :type pointer))
 150     (:metaclass proxy-class)))
 151
 152 (defun %type-of-ginstance (location)
 153   (let ((class (sap-ref-sap location 0)))
 154     (type-from-number (sap-ref-unsigned class 0))))
 155
 156 (deftype-method translate-from-alien
 157     ginstance (type-spec location &optional weak-ref)
 158   (declare (ignore type-spec))
 159   `(let ((location ,location))
 160      (unless (null-pointer-p location)
 161        (ensure-proxy-instance
 162         (%type-of-ginstance location) location ,weak-ref))))
 163
 164
 165
 166 ;;;; Metaclass for subclasses of ginstance
 167
 168 (eval-when (:compile-toplevel :load-toplevel :execute)
 169   (defclass ginstance-class (proxy-class)))
 170
 171
 172 (defmethod shared-initialize ((class ginstance-class) names
 173                               &rest initargs &key name alien-name
 174                               size ref unref)
 175   (declare (ignore initargs names))
 176   (let* ((class-name (or name (class-name class)))
 177          (type-number
 178           (find-type-number
 179            (or (first alien-name) (default-alien-type-name class-name)) t)))
 180     (register-type class-name type-number)
 181     (let ((size (or size (type-instance-size type-number))))
 182       (declare (special size))
 183       (call-next-method)))
 184
 185   (when ref
 186     (let ((ref (mkbinding (first ref) 'pointer 'pointer)))
 187       (setf
 188        (slot-value class 'copy)
 189        #'(lambda (type location)
 190            (declare (ignore type))
 191            (funcall ref location)))))
 192   (when unref
 193     (let ((unref (mkbinding (first unref) 'nil 'pointer)))
 194       (setf
 195        (slot-value class 'free)
 196        #'(lambda (type location)
 197            (declare (ignore type))
 198            (funcall unref location))))))
 199
 200
 201 (defmethod validate-superclass
 202     ((class ginstance-class) (super pcl::standard-class))
 203   (subtypep (class-name super) 'ginstance))
 204
 205
 206 ;;;; Registering fundamental types
 207
 208 (register-type 'pointer "gpointer")
 209 (register-type 'char "gchar")
 210 (register-type 'unsigned-char "guchar")
 211 (register-type 'boolean "gboolean")
 212 (register-type 'fixnum "gint")
 213 (register-type 'int "gint")
 214 (register-type 'unsigned-int "guint")
 215 (register-type 'long "glong")
 216 (register-type 'unsigned-long "gulong")
 217 (register-type 'single-float "gfloat")
 218 (register-type 'double-float "gdouble")
 219 (register-type 'string "gchararray")
 220
 221
 222 ;;;;
 223
 224 (defvar *derivable-type-info* (make-hash-table))
 225
 226 (defun register-derivable-type (type id expander)
 227   (register-type type id)
 228   (let ((type-number (register-type type id)))
 229     (setf (gethash type-number *derivable-type-info*) expander)))
 230
 231 (defun find-type-info (type)
 232   (dolist (super (cdr (type-hierarchy type)))
 233     (let ((info (gethash super *derivable-type-info*)))
 234       (return-if info))))
 235
 236 (defun expand-type-definition (type options)
 237   (let ((expander (find-type-info type)))
 238     (funcall expander (find-type-number type t) options)))
 239
 240 (defbinding type-parent (type) type-number
 241   ((find-type-number type t) type-number))
 242
 243 (defun supertype (type)
 244   (type-from-number (type-parent type)))
 245
 246 (defun type-hierarchy (type)
 247   (let ((type-number (find-type-number type t)))
 248     (unless (= type-number 0)
 249       (cons type-number (type-hierarchy (type-parent type-number))))))
 250
 251 (defbinding (type-is-p "g_type_is_a") (type super) boolean
 252   ((find-type-number type) type-number)
 253   ((find-type-number super) type-number))
 254
 255 (defbinding %type-children () pointer
 256   (type-number type-number)
 257   (num-children unsigned-int :out))
 258
 259 (defun map-subtypes (function type &optional prefix)
 260   (let ((type-number (find-type-number type t)))
 261     (multiple-value-bind (array length) (%type-children type-number)
 262       (unwind-protect
 263           (map-c-array
 264            'nil
 265            #'(lambda (type-number)
 266                (when (or
 267                       (not prefix)
 268                       (string-prefix-p prefix (find-type-name type-number)))
 269                  (funcall function type-number))
 270                (map-subtypes function type-number prefix))
 271            array 'type-number length)
 272         (deallocate-memory array)))))
 273
 274 (defun find-types (prefix)
 275   (let ((type-list nil))
 276     (maphash
 277      #'(lambda (type-number expander)
 278          (declare (ignore expander))
 279          (map-subtypes
 280           #'(lambda (type-number)
 281               (pushnew type-number type-list))
 282           type-number prefix))
 283      *derivable-type-info*)
 284     type-list))
 285
 286 (defun %sort-types-topologicaly (unsorted)
 287   (let ((sorted ()))
 288     (loop while unsorted do
 289       (dolist (type unsorted)
 290         (let ((dependencies (rest (type-hierarchy type))))
 291           (cond
 292            ((null dependencies)
 293             (push type sorted)
 294             (setq unsorted (delete type unsorted)))
 295            (t
 296             (unless (dolist (dep dependencies)
 297                       (when (find type (rest (type-hierarchy dep)))
 298                         (error "Cyclic type dependencie"))
 299                       (return-if (find dep unsorted)))
 300               (push type sorted)
 301               (setq unsorted (delete type unsorted))))))))
 302     (nreverse sorted)))
 303
 304
 305 (defun expand-type-definitions (prefix &optional args)
 306  (flet ((type-options (type-number)
 307            (let ((name (find-type-name type-number)))
 308              (cdr (assoc name args :test #'string=)))))
 309
 310    (let ((type-list
 311           (delete-if
 312            #'(lambda (type-number)
 313                (let ((name (find-type-name type-number)))
 314                  (or
 315                   (getf (type-options type-number) :ignore)
 316                   (find-if
 317                    #'(lambda (options)
 318                        (and
 319                         (string-prefix-p (first options) name)
 320                         (getf (cdr options) :ignore-prefix)))
 321                    args))))
 322            (find-types prefix))))
 323
 324      (dolist (type-number type-list)
 325        (let ((name (find-type-name type-number)))
 326          (register-type
 327           (getf (type-options type-number) :type (default-type-name name))
 328           type-number)))
 329
 330      `(progn
 331         ,@(mapcar
 332            #'(lambda (type)
 333                (expand-type-definition type (type-options type)))
 334            (%sort-types-topologicaly type-list))))))
 335
 336 (defmacro define-types-by-introspection (prefix &rest args)
 337   (expand-type-definitions prefix args))
 338
 339
 340