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select.el
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1993-07-23
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;;; select.el --- lisp portion of standard selection support.
;; Keywords: internal
;; Copyright (c) 1993 Free Software Foundation, Inc.
;; Based partially on earlier release by Lucid.
;; This file is part of GNU Emacs.
;; GNU Emacs 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, or (at your option)
;; any later version.
;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Code:
;; This is for temporary compatibility with pre-release Emacs 19.
(defalias 'x-selection 'x-get-selection)
(defun x-get-selection (&optional type data-type)
"Return the value of an X Windows selection.
The argument TYPE (default `PRIMARY') says which selection,
and the argument DATA-TYPE (default `STRING') says how to convert the data."
(x-get-selection-internal (or type 'PRIMARY) (or data-type 'STRING)))
(defun x-get-clipboard ()
"Return text pasted to the clipboard."
(x-get-selection-internal 'CLIPBOARD 'STRING))
(defun x-set-selection (type data)
"Make an X Windows selection of type TYPE and value DATA.
The argument TYPE (default `PRIMARY') says which selection,
and DATA specifies the contents. DATA may be a string,
a symbol, an integer (or a cons of two integers or list of two integers),
or a cons of two markers pointing to the same buffer.
In the last case, the selection is considered to be the text
between the markers.
The data may also be a vector of valid non-vector selection values."
(interactive (if (not current-prefix-arg)
(list (read-string "Store text for pasting: "))
(list (cons ;; these need not be ordered.
(copy-marker (point-marker))
(copy-marker (mark-marker))))))
;; This is for temporary compatibility with pre-release Emacs 19.
(if (stringp type)
(setq type (intern type)))
(or (x-valid-simple-selection-p data)
(and (vectorp data)
(let ((valid t)
(i (1- (length data))))
(while (>= i 0)
(or (x-valid-simple-selection-p (aref data i))
(setq valid nil))
(setq i (1- i)))
valid))
(signal 'error (list "invalid selection" data)))
(or type (setq type 'PRIMARY))
(if data
(x-own-selection-internal type data)
(x-disown-selection-internal type))
data)
(defun x-valid-simple-selection-p (data)
(or (stringp data)
(symbolp data)
(integerp data)
(and (consp data)
(integerp (car data))
(or (integerp (cdr data))
(and (consp (cdr data))
(integerp (car (cdr data))))))
;;; (and (fboundp 'extentp)
;;; (extentp data))
(and (consp data)
(markerp (car data))
(markerp (cdr data))
(marker-buffer (car data))
(marker-buffer (cdr data))
(eq (marker-buffer (car data))
(marker-buffer (cdr data)))
(buffer-name (marker-buffer (car data)))
(buffer-name (marker-buffer (cdr data))))))
;;; Cut Buffer support
(defun x-get-cut-buffer (&optional which-one)
"Returns the value of one of the 8 X server cut-buffers. Optional arg
WHICH-ONE should be a number from 0 to 7, defaulting to 0.
Cut buffers are considered obsolete; you should use selections instead."
(x-get-cut-buffer-internal
(if which-one
(aref [CUT_BUFFER0 CUT_BUFFER1 CUT_BUFFER2 CUT_BUFFER3
CUT_BUFFER4 CUT_BUFFER5 CUT_BUFFER6 CUT_BUFFER7]
which-one)
'CUT_BUFFER0)))
(defun x-set-cut-buffer (string &optional push)
"Store STRING into the X server's primary cut buffer.
If PUSH is non-nil, also rotate the cut buffers:
this means the previous value of the primary cut buffer moves the second
cut buffer, and the second to the third, and so on (there are 8 buffers.)
Cut buffers are considered obsolete; you should use selections instead."
;; Check the data type of STRING.
(substring string 0 0)
(if push
(x-rotate-cut-buffers-internal 1))
(x-store-cut-buffer-internal 'CUT_BUFFER0 string))
;;; Functions to convert the selection into various other selection types.
;;; Every selection type that Emacs handles is implemented this way, except
;;; for TIMESTAMP, which is a special case.
(defun xselect-convert-to-string (selection type value)
(cond ((stringp value)
value)
;;; ((extentp value)
;;; (save-excursion
;;; (set-buffer (extent-buffer value))
;;; (buffer-substring (extent-start-position value)
;;; (extent-end-position value))))
((and (consp value)
(markerp (car value))
(markerp (cdr value)))
(or (eq (marker-buffer (car value)) (marker-buffer (cdr value)))
(signal 'error
(list "markers must be in the same buffer"
(car value) (cdr value))))
(save-excursion
(set-buffer (or (marker-buffer (car value))
(error "selection is in a killed buffer")))
(buffer-substring (car value) (cdr value))))
(t nil)))
(defun xselect-convert-to-length (selection type value)
(let ((value
(cond ((stringp value)
(length value))
;;; ((extentp value)
;;; (extent-length value))
((and (consp value)
(markerp (car value))
(markerp (cdr value)))
(or (eq (marker-buffer (car value))
(marker-buffer (cdr value)))
(signal 'error
(list "markers must be in the same buffer"
(car value) (cdr value))))
(abs (- (car value) (cdr value)))))))
(if value ; force it to be in 32-bit format.
(cons (ash value -16) (logand value 65535))
nil)))
(defun xselect-convert-to-targets (selection type value)
;; return a vector of atoms, but remove duplicates first.
(let* ((all (cons 'TIMESTAMP (mapcar 'car selection-converter-alist)))
(rest all))
(while rest
(cond ((memq (car rest) (cdr rest))
(setcdr rest (delq (car rest) (cdr rest))))
((eq (car (cdr rest)) '_EMACS_INTERNAL) ; shh, it's a secret
(setcdr rest (cdr (cdr rest))))
(t
(setq rest (cdr rest)))))
(apply 'vector all)))
(defun xselect-convert-to-delete (selection type value)
(x-disown-selection-internal selection)
;; A return value of nil means that we do not know how to do this conversion,
;; and replies with an "error". A return value of NULL means that we have
;; done the conversion (and any side-effects) but have no value to return.
'NULL)
(defun xselect-convert-to-filename (selection type value)
(cond
;;; ((extentp value)
;;; (buffer-file-name (or (extent-buffer value)
;;; (error "selection is in a killed buffer"))))
((and (consp value)
(markerp (car value))
(markerp (cdr value)))
(buffer-file-name (or (marker-buffer (car value))
(error "selection is in a killed buffer"))))
(t nil)))
(defun xselect-convert-to-charpos (selection type value)
(let (a b tmp)
(cond ((cond
;;; ((extentp value)
;;; (setq a (extent-start-position value)
;;; b (extent-end-position value)))
((and (consp value)
(markerp (car value))
(markerp (cdr value)))
(setq a (car value)
b (cdr value))))
(setq a (1- a) b (1- b)) ; zero-based
(if (< b a) (setq tmp a a b b tmp))
(cons 'SPAN
(vector (cons (ash a -16) (logand a 65535))
(cons (ash b -16) (logand b 65535))))))))
(defun xselect-convert-to-lineno (selection type value)
(let (a b buf tmp)
(cond ((cond ((and (consp value)
(markerp (car value))
(markerp (cdr value)))
(setq a (marker-position (car value))
b (marker-position (cdr value))
buf (marker-buffer (car value))))
;;; ((extentp value)
;;; (setq buf (extent-buffer value)
;;; a (extent-start-position value)
;;; b (extent-end-position value)))
)
(save-excursion
(set-buffer buf)
(setq a (count-lines 1 a)
b (count-lines 1 b)))
(if (< b a) (setq tmp a a b b tmp))
(cons 'SPAN
(vector (cons (ash a -16) (logand a 65535))
(cons (ash b -16) (logand b 65535))))))))
(defun xselect-convert-to-colno (selection type value)
(let (a b buf tmp)
(cond ((cond ((and (consp value)
(markerp (car value))
(markerp (cdr value)))
(setq a (car value)
b (cdr value)
buf (marker-buffer a)))
;;; ((extentp value)
;;; (setq buf (extent-buffer value)
;;; a (extent-start-position value)
;;; b (extent-end-position value)))
)
(save-excursion
(set-buffer buf)
(goto-char a)
(setq a (current-column))
(goto-char b)
(setq b (current-column)))
(if (< b a) (setq tmp a a b b tmp))
(cons 'SPAN
(vector (cons (ash a -16) (logand a 65535))
(cons (ash b -16) (logand b 65535))))))))
(defun xselect-convert-to-os (selection type size)
(symbol-name system-type))
(defun xselect-convert-to-host (selection type size)
(system-name))
(defun xselect-convert-to-user (selection type size)
(user-full-name))
(defun xselect-convert-to-class (selection type size)
"Emacs")
;; We do not try to determine the name Emacs was invoked with,
;; because it is not clean for a program's behavior to depend on that.
(defun xselect-convert-to-name (selection type size)
"emacs")
(defun xselect-convert-to-integer (selection type value)
(and (integerp value)
(cons (ash value -16) (logand value 65535))))
(defun xselect-convert-to-atom (selection type value)
(and (symbolp value) value))
(defun xselect-convert-to-identity (selection type value) ; used internally
(vector value))
(setq selection-converter-alist
'((TEXT . xselect-convert-to-string)
(STRING . xselect-convert-to-string)
(TARGETS . xselect-convert-to-targets)
(LENGTH . xselect-convert-to-length)
(DELETE . xselect-convert-to-delete)
(FILE_NAME . xselect-convert-to-filename)
(CHARACTER_POSITION . xselect-convert-to-charpos)
(LINE_NUMBER . xselect-convert-to-lineno)
(COLUMN_NUMBER . xselect-convert-to-colno)
(OWNER_OS . xselect-convert-to-os)
(HOST_NAME . xselect-convert-to-host)
(USER . xselect-convert-to-user)
(CLASS . xselect-convert-to-class)
(NAME . xselect-convert-to-name)
(ATOM . xselect-convert-to-atom)
(INTEGER . xselect-convert-to-integer)
(_EMACS_INTERNAL . xselect-convert-to-identity)
))
(provide 'select)
;;; select.el ends here.