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 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 2, or (at your option)
  15 ;; 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; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;;; Code:
  30
  31 ;; This is for temporary compatibility with pre-release Emacs 19.
  32 (defalias 'x-selection 'x-get-selection)
  33 (defun x-get-selection (&optional type data-type)
  34   "Return the value of an X Windows selection.
  35 The argument TYPE (default `PRIMARY') says which selection,
  36 and the argument DATA-TYPE (default `STRING') says
  37 how to convert the data.
  38
  39 TYPE may be any symbol \(but nil stands for `PRIMARY').  However,
  40 only a few symbols are commonly used.  They conventionally have
  41 all upper-case names.  The most often used ones, in addition to
  42 `PRIMARY', are `SECONDARY' and `CLIPBOARD'.
  43
  44 DATA-TYPE is usually `STRING', but can also be one of the symbols
  45 in `selection-converter-alist', which see."
  46   (let ((data (x-get-selection-internal (or type 'PRIMARY)
  47                                         (or data-type 'STRING)))
  48         coding)
  49     (when (and (stringp data)
  50                (setq data-type (get-text-property 0 'foreign-selection data)))
  51       (setq coding (if (eq data-type 'UTF8_STRING)
  52                        'utf-8
  53                      (or next-selection-coding-system
  54                          selection-coding-system))
  55             data (decode-coding-string data coding))
  56       (put-text-property 0 (length data) 'foreign-selection data-type data))
  57     data))
  58
  59 (defun x-get-clipboard ()
  60   "Return text pasted to the clipboard."
  61   (x-get-selection-internal 'CLIPBOARD 'STRING))
  62
  63 (defun x-set-selection (type data)
  64   "Make an X Windows selection of type TYPE and value DATA.
  65 The argument TYPE (nil means `PRIMARY') says which selection, and
  66 DATA specifies the contents.  TYPE must be a symbol.  \(It can also
  67 be a string, which stands for the symbol with that name, but this
  68 is considered obsolete.)  DATA may be a string, a symbol, an
  69 integer (or a cons of two integers or list of two integers).
  70
  71 The selection may also be a cons of two markers pointing to the same buffer,
  72 or an overlay.  In these cases, the selection is considered to be the text
  73 between the markers *at whatever time the selection is examined*.
  74 Thus, editing done in the buffer after you specify the selection
  75 can alter the effective value of the selection.
  76
  77 The data may also be a vector of valid non-vector selection values.
  78
  79 The return value is DATA.
  80
  81 Interactively, this command sets the primary selection.  Without
  82 prefix argument, it reads the selection in the minibuffer.  With
  83 prefix argument, it uses the text of the region as the selection value ."
  84   (interactive (if (not current-prefix-arg)
  85                    (list 'PRIMARY (read-string "Set text for pasting: "))
  86                  (list 'PRIMARY (buffer-substring (region-beginning) (region-end)))))
  87   ;; This is for temporary compatibility with pre-release Emacs 19.
  88   (if (stringp type)
  89       (setq type (intern type)))
  90   (or (x-valid-simple-selection-p data)
  91       (and (vectorp data)
  92            (let ((valid t)
  93                  (i (1- (length data))))
  94              (while (>= i 0)
  95                (or (x-valid-simple-selection-p (aref data i))
  96                    (setq valid nil))
  97                (setq i (1- i)))
  98              valid))
  99       (signal 'error (list "invalid selection" data)))
 100   (or type (setq type 'PRIMARY))
 101   (if data
 102       (x-own-selection-internal type data)
 103     (x-disown-selection-internal type))
 104   data)
 105
 106 (defun x-valid-simple-selection-p (data)
 107   (or (stringp data)
 108       (symbolp data)
 109       (integerp data)
 110       (and (consp data)
 111            (integerp (car data))
 112            (or (integerp (cdr data))
 113                (and (consp (cdr data))
 114                     (integerp (car (cdr data))))))
 115       (overlayp data)
 116       (and (consp data)
 117            (markerp (car data))
 118            (markerp (cdr data))
 119            (marker-buffer (car data))
 120            (marker-buffer (cdr data))
 121            (eq (marker-buffer (car data))
 122                (marker-buffer (cdr data)))
 123            (buffer-name (marker-buffer (car data)))
 124            (buffer-name (marker-buffer (cdr data))))))
 125 \f
 126 ;;; Cut Buffer support
 127
 128 (defun x-get-cut-buffer (&optional which-one)
 129   "Returns the value of one of the 8 X server cut-buffers.
 130 Optional arg WHICH-ONE should be a number from 0 to 7, defaulting to 0.
 131 Cut buffers are considered obsolete; you should use selections instead."
 132   (x-get-cut-buffer-internal
 133    (if which-one
 134        (aref [CUT_BUFFER0 CUT_BUFFER1 CUT_BUFFER2 CUT_BUFFER3
 135               CUT_BUFFER4 CUT_BUFFER5 CUT_BUFFER6 CUT_BUFFER7]
 136              which-one)
 137      'CUT_BUFFER0)))
 138
 139 (defun x-set-cut-buffer (string &optional push)
 140   "Store STRING into the X server's primary cut buffer.
 141 If PUSH is non-nil, also rotate the cut buffers:
 142 this means the previous value of the primary cut buffer moves to the second
 143 cut buffer, and the second to the third, and so on (there are 8 buffers.)
 144 Cut buffers are considered obsolete; you should use selections instead."
 145   (or (stringp string) (signal 'wrong-type-argument (list 'string string)))
 146   (if push
 147       (x-rotate-cut-buffers-internal 1))
 148   (x-store-cut-buffer-internal 'CUT_BUFFER0 string))
 149
 150 \f
 151 ;;; Functions to convert the selection into various other selection types.
 152 ;;; Every selection type that Emacs handles is implemented this way, except
 153 ;;; for TIMESTAMP, which is a special case.
 154
 155 (eval-when-compile (require 'ccl))
 156
 157 (define-ccl-program ccl-check-utf-8
 158   '(0
 159     ((r0 = 1)
 160      (loop
 161       (read-if (r1 < #x80) (repeat)
 162         ((r0 = 0)
 163          (if (r1 < #xC2) (end))
 164          (read r2)
 165          (if ((r2 & #xC0) != #x80) (end))
 166          (if (r1 < #xE0) ((r0 = 1) (repeat)))
 167          (read r2)
 168          (if ((r2 & #xC0) != #x80) (end))
 169          (if (r1 < #xF0) ((r0 = 1) (repeat)))
 170          (read r2)
 171          (if ((r2 & #xC0) != #x80) (end))
 172          (if (r1 < #xF8) ((r0 = 1) (repeat)))
 173          (read r2)
 174          (if ((r2 & #xC0) != #x80) (end))
 175          (if (r1 == #xF8) ((r0 = 1) (repeat)))
 176          (end))))))
 177   "Check if the input unibyte string is a valid UTF-8 sequence or not.
 178 If it is valid, set the register `r0' to 1, else set it to 0.")
 179
 180 (defun string-utf-8-p (string)
 181   "Return non-nil iff STRING is a unibyte string of valid UTF-8 sequence."
 182   (if (or (not (stringp string))
 183           (multibyte-string-p string))
 184       (error "Not a unibyte string: %s" string))
 185   (let ((status (make-vector 9 0)))
 186     (ccl-execute-on-string ccl-check-utf-8 status string)
 187     (= (aref status 0) 1)))
 188
 189
 190 (defun xselect-convert-to-string (selection type value)
 191   (let (str coding)
 192     ;; Get the actual string from VALUE.
 193     (cond ((stringp value)
 194            (setq str value))
 195
 196           ((overlayp value)
 197            (save-excursion
 198              (or (buffer-name (overlay-buffer value))
 199                  (error "selection is in a killed buffer"))
 200              (set-buffer (overlay-buffer value))
 201              (setq str (buffer-substring (overlay-start value)
 202                                          (overlay-end value)))))
 203           ((and (consp value)
 204                 (markerp (car value))
 205                 (markerp (cdr value)))
 206            (or (eq (marker-buffer (car value)) (marker-buffer (cdr value)))
 207                (signal 'error
 208                        (list "markers must be in the same buffer"
 209                              (car value) (cdr value))))
 210            (save-excursion
 211              (set-buffer (or (marker-buffer (car value))
 212                              (error "selection is in a killed buffer")))
 213              (setq str (buffer-substring (car value) (cdr value))))))
 214
 215     (when str
 216       ;; If TYPE is nil, this is a local request, thus return STR as
 217       ;; is.  Otherwise, encode STR.
 218       (if (not type)
 219           str
 220         (setq coding (or next-selection-coding-system selection-coding-system))
 221         (if coding
 222             (setq coding (coding-system-base coding))
 223           (setq coding 'raw-text))
 224         (let ((inhibit-read-only t))
 225           ;; Suppress producing escape sequences for compositions.
 226           (remove-text-properties 0 (length str) '(composition nil) str)
 227           (cond
 228            ((eq type 'TEXT)
 229             (if (not (multibyte-string-p str))
 230                 ;; Don't have to encode unibyte string.
 231                 (setq type 'STRING)
 232               ;; If STR contains only ASCII, Latin-1, and raw bytes,
 233               ;; encode STR by iso-latin-1, and return it as type
 234               ;; `STRING'.  Otherwise, encode STR by CODING.  In that
 235               ;; case, the returing type depends on CODING.
 236               (let ((charsets (find-charset-string str)))
 237                 (setq charsets
 238                       (delq 'ascii
 239                             (delq 'latin-iso8859-1
 240                                   (delq 'eight-bit-control
 241                                         (delq 'eight-bit-graphic charsets)))))
 242                 (if charsets
 243                     (setq str (encode-coding-string str coding)
 244                           type (if (memq coding '(compound-text
 245                                                   compound-text-with-extensions))
 246                                    'COMPOUND_TEXT
 247                                  'STRING))
 248                   (setq type 'STRING
 249                         str (encode-coding-string str 'iso-latin-1))))))
 250
 251            ((eq type 'COMPOUND_TEXT)
 252             (setq str (encode-coding-string str coding)))
 253
 254            ((eq type 'STRING)
 255             (if (memq coding '(compound-text
 256                                compound-text-with-extensions))
 257                 (setq str (string-make-unibyte str))
 258               (setq str (encode-coding-string str coding))))
 259
 260            ((eq type 'UTF8_STRING)
 261             (if (multibyte-string-p str)
 262                 (setq str (encode-coding-string str 'utf-8)))
 263             (if (not (string-utf-8-p str))
 264                 (setq str nil))) ;; Decline request as we don't have UTF-8 data.
 265            (t
 266             (error "Unknow selection type: %S" type))
 267            )))
 268
 269       (setq next-selection-coding-system nil)
 270       (cons type str))))
 271
 272
 273 (defun xselect-convert-to-length (selection type value)
 274   (let ((value
 275          (cond ((stringp value)
 276                 (length value))
 277                ((overlayp value)
 278                 (abs (- (overlay-end value) (overlay-start value))))
 279                ((and (consp value)
 280                      (markerp (car value))
 281                      (markerp (cdr value)))
 282                 (or (eq (marker-buffer (car value))
 283                         (marker-buffer (cdr value)))
 284                     (signal 'error
 285                             (list "markers must be in the same buffer"
 286                                   (car value) (cdr value))))
 287                 (abs (- (car value) (cdr value)))))))
 288     (if value ; force it to be in 32-bit format.
 289         (cons (ash value -16) (logand value 65535))
 290       nil)))
 291
 292 (defun xselect-convert-to-targets (selection type value)
 293   ;; return a vector of atoms, but remove duplicates first.
 294   (let* ((all (cons 'TIMESTAMP (mapcar 'car selection-converter-alist)))
 295          (rest all))
 296     (while rest
 297       (cond ((memq (car rest) (cdr rest))
 298              (setcdr rest (delq (car rest) (cdr rest))))
 299             ((eq (car (cdr rest)) '_EMACS_INTERNAL)  ; shh, it's a secret
 300              (setcdr rest (cdr (cdr rest))))
 301             (t
 302              (setq rest (cdr rest)))))
 303     (apply 'vector all)))
 304
 305 (defun xselect-convert-to-delete (selection type value)
 306   (x-disown-selection-internal selection)
 307   ;; A return value of nil means that we do not know how to do this conversion,
 308   ;; and replies with an "error".  A return value of NULL means that we have
 309   ;; done the conversion (and any side-effects) but have no value to return.
 310   'NULL)
 311
 312 (defun xselect-convert-to-filename (selection type value)
 313   (cond ((overlayp value)
 314          (buffer-file-name (or (overlay-buffer value)
 315                                (error "selection is in a killed buffer"))))
 316         ((and (consp value)
 317               (markerp (car value))
 318               (markerp (cdr value)))
 319          (buffer-file-name (or (marker-buffer (car value))
 320                                (error "selection is in a killed buffer"))))
 321         (t nil)))
 322
 323 (defun xselect-convert-to-charpos (selection type value)
 324   (let (a b tmp)
 325     (cond ((cond ((overlayp value)
 326                   (setq a (overlay-start value)
 327                         b (overlay-end value)))
 328                  ((and (consp value)
 329                        (markerp (car value))
 330                        (markerp (cdr value)))
 331                   (setq a (car value)
 332                         b (cdr value))))
 333            (setq a (1- a) b (1- b)) ; zero-based
 334            (if (< b a) (setq tmp a a b b tmp))
 335            (cons 'SPAN
 336                  (vector (cons (ash a -16) (logand a 65535))
 337                          (cons (ash b -16) (logand b 65535))))))))
 338
 339 (defun xselect-convert-to-lineno (selection type value)
 340   (let (a b buf tmp)
 341     (cond ((cond ((and (consp value)
 342                        (markerp (car value))
 343                        (markerp (cdr value)))
 344                   (setq a (marker-position (car value))
 345                         b (marker-position (cdr value))
 346                         buf (marker-buffer (car value))))
 347                  ((overlayp value)
 348                   (setq buf (overlay-buffer value)
 349                         a (overlay-start value)
 350                         b (overlay-end value)))
 351                  )
 352            (save-excursion
 353              (set-buffer buf)
 354              (setq a (count-lines 1 a)
 355                    b (count-lines 1 b)))
 356            (if (< b a) (setq tmp a a b b tmp))
 357            (cons 'SPAN
 358                  (vector (cons (ash a -16) (logand a 65535))
 359                          (cons (ash b -16) (logand b 65535))))))))
 360
 361 (defun xselect-convert-to-colno (selection type value)
 362   (let (a b buf tmp)
 363     (cond ((cond ((and (consp value)
 364                        (markerp (car value))
 365                        (markerp (cdr value)))
 366                   (setq a (car value)
 367                         b (cdr value)
 368                         buf (marker-buffer a)))
 369                  ((overlayp value)
 370                   (setq buf (overlay-buffer value)
 371                         a (overlay-start value)
 372                         b (overlay-end value)))
 373                  )
 374            (save-excursion
 375              (set-buffer buf)
 376              (goto-char a)
 377              (setq a (current-column))
 378              (goto-char b)
 379              (setq b (current-column)))
 380            (if (< b a) (setq tmp a a b b tmp))
 381            (cons 'SPAN
 382                  (vector (cons (ash a -16) (logand a 65535))
 383                          (cons (ash b -16) (logand b 65535))))))))
 384
 385 (defun xselect-convert-to-os (selection type size)
 386   (symbol-name system-type))
 387
 388 (defun xselect-convert-to-host (selection type size)
 389   (system-name))
 390
 391 (defun xselect-convert-to-user (selection type size)
 392   (user-full-name))
 393
 394 (defun xselect-convert-to-class (selection type size)
 395   "Convert selection to class.
 396 This function returns the string \"Emacs\"."
 397   "Emacs")
 398
 399 ;; We do not try to determine the name Emacs was invoked with,
 400 ;; because it is not clean for a program's behavior to depend on that.
 401 (defun xselect-convert-to-name (selection type size)
 402   "Convert selection to name.
 403 This function returns the string \"emacs\"."
 404   "emacs")
 405
 406 (defun xselect-convert-to-integer (selection type value)
 407   (and (integerp value)
 408        (cons (ash value -16) (logand value 65535))))
 409
 410 (defun xselect-convert-to-atom (selection type value)
 411   (and (symbolp value) value))
 412
 413 (defun xselect-convert-to-identity (selection type value) ; used internally
 414   (vector value))
 415
 416 (setq selection-converter-alist
 417       '((TEXT . xselect-convert-to-string)
 418         (COMPOUND_TEXT . xselect-convert-to-string)
 419         (STRING . xselect-convert-to-string)
 420         (UTF8_STRING . xselect-convert-to-string)
 421         (TARGETS . xselect-convert-to-targets)
 422         (LENGTH . xselect-convert-to-length)
 423         (DELETE . xselect-convert-to-delete)
 424         (FILE_NAME . xselect-convert-to-filename)
 425         (CHARACTER_POSITION . xselect-convert-to-charpos)
 426         (LINE_NUMBER . xselect-convert-to-lineno)
 427         (COLUMN_NUMBER . xselect-convert-to-colno)
 428         (OWNER_OS . xselect-convert-to-os)
 429         (HOST_NAME . xselect-convert-to-host)
 430         (USER . xselect-convert-to-user)
 431         (CLASS . xselect-convert-to-class)
 432         (NAME . xselect-convert-to-name)
 433         (ATOM . xselect-convert-to-atom)
 434         (INTEGER . xselect-convert-to-integer)
 435         (_EMACS_INTERNAL . xselect-convert-to-identity)
 436         ))
 437
 438 (provide 'select)
 439
 440 ;;; arch-tag: bb634f97-8a3b-4b0a-b940-f6e09982328c
 441 ;;; select.el ends here