lisp/select.el

   1 ;;; select.el --- lisp portion of standard selection support
   2
   3 ;; Maintainer: FSF
   4 ;; Keywords: internal
   5
   6 ;; Copyright (C) 1993, 1994, 2001, 2002, 2003, 2004,
   7 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   8 ;; Based partially on earlier release by Lucid.
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 (defcustom selection-coding-system nil
  30   "Coding system for communicating with other X clients.
  31
  32 When sending text via selection and clipboard, if the target
  33 data-type matches with the type of this coding system, it is used
  34 for encoding the text.  Otherwise (including the case that this
  35 variable is nil), a proper coding system is used as below:
  36
  37 data-type       coding system
  38 ---------       -------------
  39 UTF8_STRING     utf-8
  40 COMPOUND_TEXT   compound-text-with-extensions
  41 STRING          iso-latin-1
  42 C_STRING        no-conversion
  43
  44 When receiving text, if this coding system is non-nil, it is used
  45 for decoding regardless of the data-type.  If this is nil, a
  46 proper coding system is used according to the data-type as above.
  47
  48 See also the documentation of the variable `x-select-request-type' how
  49 to control which data-type to request for receiving text.
  50
  51 The default value is nil."
  52   :type 'coding-system
  53   :group 'mule
  54   ;; Default was compound-text-with-extensions in 22.x (pre-unicode).
  55   :version "23.1"
  56   :set (lambda (symbol value)
  57          (set-selection-coding-system value)
  58          (set symbol value)))
  59
  60 (defvar next-selection-coding-system nil
  61   "Coding system for the next communication with other X clients.
  62 Usually, `selection-coding-system' is used for communicating with
  63 other X clients.  But, if this variable is set, it is used for
  64 the next communication only.  After the communication, this
  65 variable is set to nil.")
  66
  67 ;; This is for temporary compatibility with pre-release Emacs 19.
  68 (defalias 'x-selection 'x-get-selection)
  69 (defun x-get-selection (&optional type data-type)
  70   "Return the value of an X Windows selection.
  71 The argument TYPE (default `PRIMARY') says which selection,
  72 and the argument DATA-TYPE (default `STRING') says
  73 how to convert the data.
  74
  75 TYPE may be any symbol \(but nil stands for `PRIMARY').  However,
  76 only a few symbols are commonly used.  They conventionally have
  77 all upper-case names.  The most often used ones, in addition to
  78 `PRIMARY', are `SECONDARY' and `CLIPBOARD'.
  79
  80 DATA-TYPE is usually `STRING', but can also be one of the symbols
  81 in `selection-converter-alist', which see."
  82   (let ((data (x-get-selection-internal (or type 'PRIMARY)
  83                                         (or data-type 'STRING)))
  84         coding)
  85     (when (and (stringp data)
  86                (setq data-type (get-text-property 0 'foreign-selection data)))
  87       (setq coding (or next-selection-coding-system
  88                        selection-coding-system
  89                        (cond ((eq data-type 'UTF8_STRING)
  90                               'utf-8)
  91                              ((eq data-type 'COMPOUND_TEXT)
  92                               'compound-text-with-extensions)
  93                              ((eq data-type 'C_STRING)
  94                               nil)
  95                              ((eq data-type 'STRING)
  96                               'iso-8859-1)
  97                              (t
  98                               (error "Unknow selection data type: %S" type))))
  99             data (if coding (decode-coding-string data coding)
 100                    (string-to-multibyte data)))
 101       (setq next-selection-coding-system nil)
 102       (put-text-property 0 (length data) 'foreign-selection data-type data))
 103     data))
 104
 105 (defun x-get-clipboard ()
 106   "Return text pasted to the clipboard."
 107   (x-get-selection-internal 'CLIPBOARD 'STRING))
 108
 109 (defun x-set-selection (type data)
 110   "Make an X Windows selection of type TYPE and value DATA.
 111 The argument TYPE (nil means `PRIMARY') says which selection, and
 112 DATA specifies the contents.  TYPE must be a symbol.  \(It can also
 113 be a string, which stands for the symbol with that name, but this
 114 is considered obsolete.)  DATA may be a string, a symbol, an
 115 integer (or a cons of two integers or list of two integers).
 116
 117 The selection may also be a cons of two markers pointing to the same buffer,
 118 or an overlay.  In these cases, the selection is considered to be the text
 119 between the markers *at whatever time the selection is examined*.
 120 Thus, editing done in the buffer after you specify the selection
 121 can alter the effective value of the selection.
 122
 123 The data may also be a vector of valid non-vector selection values.
 124
 125 The return value is DATA.
 126
 127 Interactively, this command sets the primary selection.  Without
 128 prefix argument, it reads the selection in the minibuffer.  With
 129 prefix argument, it uses the text of the region as the selection value ."
 130   (interactive (if (not current-prefix-arg)
 131                    (list 'PRIMARY (read-string "Set text for pasting: "))
 132                  (list 'PRIMARY (buffer-substring (region-beginning) (region-end)))))
 133   ;; This is for temporary compatibility with pre-release Emacs 19.
 134   (if (stringp type)
 135       (setq type (intern type)))
 136   (or (x-valid-simple-selection-p data)
 137       (and (vectorp data)
 138            (let ((valid t)
 139                  (i (1- (length data))))
 140              (while (>= i 0)
 141                (or (x-valid-simple-selection-p (aref data i))
 142                    (setq valid nil))
 143                (setq i (1- i)))
 144              valid))
 145       (signal 'error (list "invalid selection" data)))
 146   (or type (setq type 'PRIMARY))
 147   (if data
 148       (x-own-selection-internal type data)
 149     (x-disown-selection-internal type))
 150   data)
 151
 152 (defun x-valid-simple-selection-p (data)
 153   (or (stringp data)
 154       (symbolp data)
 155       (integerp data)
 156       (and (consp data)
 157            (integerp (car data))
 158            (or (integerp (cdr data))
 159                (and (consp (cdr data))
 160                     (integerp (car (cdr data))))))
 161       (overlayp data)
 162       (and (consp data)
 163            (markerp (car data))
 164            (markerp (cdr data))
 165            (marker-buffer (car data))
 166            (marker-buffer (cdr data))
 167            (eq (marker-buffer (car data))
 168                (marker-buffer (cdr data)))
 169            (buffer-name (marker-buffer (car data)))
 170            (buffer-name (marker-buffer (cdr data))))))
 171 \f
 172 ;;; Cut Buffer support
 173
 174 (declare-function x-get-cut-buffer-internal "xselect.c")
 175
 176 (defun x-get-cut-buffer (&optional which-one)
 177   "Returns the value of one of the 8 X server cut-buffers.
 178 Optional arg WHICH-ONE should be a number from 0 to 7, defaulting to 0.
 179 Cut buffers are considered obsolete; you should use selections instead."
 180   (x-get-cut-buffer-internal
 181    (if which-one
 182        (aref [CUT_BUFFER0 CUT_BUFFER1 CUT_BUFFER2 CUT_BUFFER3
 183               CUT_BUFFER4 CUT_BUFFER5 CUT_BUFFER6 CUT_BUFFER7]
 184              which-one)
 185      'CUT_BUFFER0)))
 186
 187 (declare-function x-rotate-cut-buffers-internal "xselect.c")
 188 (declare-function x-store-cut-buffer-internal "xselect.c")
 189
 190 (defun x-set-cut-buffer (string &optional push)
 191   "Store STRING into the X server's primary cut buffer.
 192 If PUSH is non-nil, also rotate the cut buffers:
 193 this means the previous value of the primary cut buffer moves to the second
 194 cut buffer, and the second to the third, and so on (there are 8 buffers.)
 195 Cut buffers are considered obsolete; you should use selections instead."
 196   (or (stringp string) (signal 'wrong-type-argument (list 'string string)))
 197   (if push
 198       (x-rotate-cut-buffers-internal 1))
 199   (x-store-cut-buffer-internal 'CUT_BUFFER0 string))
 200
 201 \f
 202 ;;; Functions to convert the selection into various other selection types.
 203 ;;; Every selection type that Emacs handles is implemented this way, except
 204 ;;; for TIMESTAMP, which is a special case.
 205
 206 (defun xselect-convert-to-string (selection type value)
 207   (let (str coding)
 208     ;; Get the actual string from VALUE.
 209     (cond ((stringp value)
 210            (setq str value))
 211
 212           ((overlayp value)
 213            (save-excursion
 214              (or (buffer-name (overlay-buffer value))
 215                  (error "selection is in a killed buffer"))
 216              (set-buffer (overlay-buffer value))
 217              (setq str (buffer-substring (overlay-start value)
 218                                          (overlay-end value)))))
 219           ((and (consp value)
 220                 (markerp (car value))
 221                 (markerp (cdr value)))
 222            (or (eq (marker-buffer (car value)) (marker-buffer (cdr value)))
 223                (signal 'error
 224                        (list "markers must be in the same buffer"
 225                              (car value) (cdr value))))
 226            (save-excursion
 227              (set-buffer (or (marker-buffer (car value))
 228                              (error "selection is in a killed buffer")))
 229              (setq str (buffer-substring (car value) (cdr value))))))
 230
 231     (when str
 232       ;; If TYPE is nil, this is a local request, thus return STR as
 233       ;; is.  Otherwise, encode STR.
 234       (if (not type)
 235           str
 236         (setq coding (or next-selection-coding-system selection-coding-system))
 237         (if coding
 238             (setq coding (coding-system-base coding)))
 239         (let ((inhibit-read-only t))
 240           ;; Suppress producing escape sequences for compositions.
 241           (remove-text-properties 0 (length str) '(composition nil) str)
 242           (if (eq type 'TEXT)
 243               ;; TEXT is a polymorphic target.  We must select the
 244               ;; actual type from `UTF8_STRING', `COMPOUND_TEXT',
 245               ;; `STRING', and `C_STRING'.
 246               (if (not (multibyte-string-p str))
 247                   (setq type 'C_STRING)
 248                 (let (non-latin-1 non-unicode eight-bit)
 249                   (mapc #'(lambda (x)
 250                             (if (>= x #x100)
 251                                 (if (< x #x110000)
 252                                     (setq non-latin-1 t)
 253                                   (if (< x #x3FFF80)
 254                                       (setq non-unicode t)
 255                                     (setq eight-bit t)))))
 256                         str)
 257                   (setq type (if non-unicode 'COMPOUND_TEXT
 258                                (if non-latin-1 'UTF8_STRING
 259                                  (if eight-bit 'C_STRING 'STRING)))))))
 260           (cond
 261            ((eq type 'UTF8_STRING)
 262             (if (or (not coding)
 263                     (not (eq (coding-system-type coding) 'utf-8)))
 264                 (setq coding 'utf-8))
 265             (setq str (encode-coding-string str coding)))
 266
 267            ((eq type 'STRING)
 268             (if (or (not coding)
 269                     (not (eq (coding-system-type coding) 'charset)))
 270                 (setq coding 'iso-8859-1))
 271             (setq str (encode-coding-string str coding)))
 272
 273            ((eq type 'COMPOUND_TEXT)
 274             (if (or (not coding)
 275                     (not (eq (coding-system-type coding) 'iso-2022)))
 276                 (setq coding 'compound-text-with-extensions))
 277             (setq str (encode-coding-string str coding)))
 278
 279            ((eq type 'C_STRING)
 280             (setq str (string-make-unibyte str)))
 281
 282            (t
 283             (error "Unknow selection type: %S" type))
 284            )))
 285
 286       (setq next-selection-coding-system nil)
 287       (cons type str))))
 288
 289
 290 (defun xselect-convert-to-length (selection type value)
 291   (let ((value
 292          (cond ((stringp value)
 293                 (length value))
 294                ((overlayp value)
 295                 (abs (- (overlay-end value) (overlay-start value))))
 296                ((and (consp value)
 297                      (markerp (car value))
 298                      (markerp (cdr value)))
 299                 (or (eq (marker-buffer (car value))
 300                         (marker-buffer (cdr value)))
 301                     (signal 'error
 302                             (list "markers must be in the same buffer"
 303                                   (car value) (cdr value))))
 304                 (abs (- (car value) (cdr value)))))))
 305     (if value ; force it to be in 32-bit format.
 306         (cons (ash value -16) (logand value 65535))
 307       nil)))
 308
 309 (defun xselect-convert-to-targets (selection type value)
 310   ;; return a vector of atoms, but remove duplicates first.
 311   (let* ((all (cons 'TIMESTAMP (mapcar 'car selection-converter-alist)))
 312          (rest all))
 313     (while rest
 314       (cond ((memq (car rest) (cdr rest))
 315              (setcdr rest (delq (car rest) (cdr rest))))
 316             ((eq (car (cdr rest)) '_EMACS_INTERNAL)  ; shh, it's a secret
 317              (setcdr rest (cdr (cdr rest))))
 318             (t
 319              (setq rest (cdr rest)))))
 320     (apply 'vector all)))
 321
 322 (defun xselect-convert-to-delete (selection type value)
 323   (x-disown-selection-internal selection)
 324   ;; A return value of nil means that we do not know how to do this conversion,
 325   ;; and replies with an "error".  A return value of NULL means that we have
 326   ;; done the conversion (and any side-effects) but have no value to return.
 327   'NULL)
 328
 329 (defun xselect-convert-to-filename (selection type value)
 330   (cond ((overlayp value)
 331          (buffer-file-name (or (overlay-buffer value)
 332                                (error "selection is in a killed buffer"))))
 333         ((and (consp value)
 334               (markerp (car value))
 335               (markerp (cdr value)))
 336          (buffer-file-name (or (marker-buffer (car value))
 337                                (error "selection is in a killed buffer"))))
 338         (t nil)))
 339
 340 (defun xselect-convert-to-charpos (selection type value)
 341   (let (a b tmp)
 342     (cond ((cond ((overlayp value)
 343                   (setq a (overlay-start value)
 344                         b (overlay-end value)))
 345                  ((and (consp value)
 346                        (markerp (car value))
 347                        (markerp (cdr value)))
 348                   (setq a (car value)
 349                         b (cdr value))))
 350            (setq a (1- a) b (1- b)) ; zero-based
 351            (if (< b a) (setq tmp a a b b tmp))
 352            (cons 'SPAN
 353                  (vector (cons (ash a -16) (logand a 65535))
 354                          (cons (ash b -16) (logand b 65535))))))))
 355
 356 (defun xselect-convert-to-lineno (selection type value)
 357   (let (a b buf tmp)
 358     (cond ((cond ((and (consp value)
 359                        (markerp (car value))
 360                        (markerp (cdr value)))
 361                   (setq a (marker-position (car value))
 362                         b (marker-position (cdr value))
 363                         buf (marker-buffer (car value))))
 364                  ((overlayp value)
 365                   (setq buf (overlay-buffer value)
 366                         a (overlay-start value)
 367                         b (overlay-end value)))
 368                  )
 369            (save-excursion
 370              (set-buffer buf)
 371              (setq a (count-lines 1 a)
 372                    b (count-lines 1 b)))
 373            (if (< b a) (setq tmp a a b b tmp))
 374            (cons 'SPAN
 375                  (vector (cons (ash a -16) (logand a 65535))
 376                          (cons (ash b -16) (logand b 65535))))))))
 377
 378 (defun xselect-convert-to-colno (selection type value)
 379   (let (a b buf tmp)
 380     (cond ((cond ((and (consp value)
 381                        (markerp (car value))
 382                        (markerp (cdr value)))
 383                   (setq a (car value)
 384                         b (cdr value)
 385                         buf (marker-buffer a)))
 386                  ((overlayp value)
 387                   (setq buf (overlay-buffer value)
 388                         a (overlay-start value)
 389                         b (overlay-end value)))
 390                  )
 391            (save-excursion
 392              (set-buffer buf)
 393              (goto-char a)
 394              (setq a (current-column))
 395              (goto-char b)
 396              (setq b (current-column)))
 397            (if (< b a) (setq tmp a a b b tmp))
 398            (cons 'SPAN
 399                  (vector (cons (ash a -16) (logand a 65535))
 400                          (cons (ash b -16) (logand b 65535))))))))
 401
 402 (defun xselect-convert-to-os (selection type size)
 403   (symbol-name system-type))
 404
 405 (defun xselect-convert-to-host (selection type size)
 406   (system-name))
 407
 408 (defun xselect-convert-to-user (selection type size)
 409   (user-full-name))
 410
 411 (defun xselect-convert-to-class (selection type size)
 412   "Convert selection to class.
 413 This function returns the string \"Emacs\"."
 414   "Emacs")
 415
 416 ;; We do not try to determine the name Emacs was invoked with,
 417 ;; because it is not clean for a program's behavior to depend on that.
 418 (defun xselect-convert-to-name (selection type size)
 419   "Convert selection to name.
 420 This function returns the string \"emacs\"."
 421   "emacs")
 422
 423 (defun xselect-convert-to-integer (selection type value)
 424   (and (integerp value)
 425        (cons (ash value -16) (logand value 65535))))
 426
 427 (defun xselect-convert-to-atom (selection type value)
 428   (and (symbolp value) value))
 429
 430 (defun xselect-convert-to-identity (selection type value) ; used internally
 431   (vector value))
 432
 433 (setq selection-converter-alist
 434       '((TEXT . xselect-convert-to-string)
 435         (COMPOUND_TEXT . xselect-convert-to-string)
 436         (STRING . xselect-convert-to-string)
 437         (UTF8_STRING . xselect-convert-to-string)
 438         (TARGETS . xselect-convert-to-targets)
 439         (LENGTH . xselect-convert-to-length)
 440         (DELETE . xselect-convert-to-delete)
 441         (FILE_NAME . xselect-convert-to-filename)
 442         (CHARACTER_POSITION . xselect-convert-to-charpos)
 443         (LINE_NUMBER . xselect-convert-to-lineno)
 444         (COLUMN_NUMBER . xselect-convert-to-colno)
 445         (OWNER_OS . xselect-convert-to-os)
 446         (HOST_NAME . xselect-convert-to-host)
 447         (USER . xselect-convert-to-user)
 448         (CLASS . xselect-convert-to-class)
 449         (NAME . xselect-convert-to-name)
 450         (ATOM . xselect-convert-to-atom)
 451         (INTEGER . xselect-convert-to-integer)
 452         (_EMACS_INTERNAL . xselect-convert-to-identity)
 453         ))
 454
 455 (provide 'select)
 456
 457 ;; arch-tag: bb634f97-8a3b-4b0a-b940-f6e09982328c
 458 ;;; select.el ends here