(U-000217D8): New character.

[chise/xemacs-chise.git.1] / lisp / select.el

diff --git a/lisp/select.el b/lisp/select.el
index 338ea0c..b185dea 100644 (file)
--- a/lisp/select.el
+++ b/lisp/select.el
@@ -20,7 +20,7 @@
 ;; General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
 ;; General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License

-;; along with XEmacs; see the file COPYING.  If not, write to the 
+;; along with XEmacs; see the file COPYING.  If not, write to the

 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 ;; Boston, MA 02111-1307, USA.
 
 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 ;; Boston, MA 02111-1307, USA.
 

@@ -28,7 +28,7 @@
 
 ;;; Commentary:
 
 
 ;;; Commentary:
 

-;; This file is dumped with XEmacs 
+;; This file is dumped with XEmacs

 
 ;;; Code:
 
 
 ;;; Code:
 

@@ -40,7 +40,7 @@ COMPOUND_TEXT and STRING are the most commonly used data types.
 If a list is provided, the types are tried in sequence until
 there is a successful conversion.")
 
 If a list is provided, the types are tried in sequence until
 there is a successful conversion.")
 

-(defvar selection-is-clipboard-p nil 
+(defvar selection-sets-clipboard nil

   "Controls the selection's relationship to the clipboard.
 When non-nil, any operation that sets the primary selection will also
 set the clipboard.")
   "Controls the selection's relationship to the clipboard.
 When non-nil, any operation that sets the primary selection will also
 set the clipboard.")

@@ -66,56 +66,86 @@ set the clipboard.")
 (defun yank-clipboard-selection ()
   "Insert the current Clipboard selection at point."
   (interactive "*")
 (defun yank-clipboard-selection ()
   "Insert the current Clipboard selection at point."
   (interactive "*")

-  (case (device-type (selected-device))
-    (x (x-yank-clipboard-selection))
-    (mswindows (mswindows-paste-clipboard))
-    (otherwise nil)))
+  (when (console-on-window-system-p)
+    (setq last-command nil)
+    (setq this-command 'yank) ; so that yank-pop works.
+    (let ((clip (get-clipboard)))
+      (or clip (error "there is no clipboard selection"))
+      (push-mark)
+      (insert clip))))
+
+(defun get-clipboard ()
+  "Return text pasted to the clipboard.
+Not suitable for `interprogram-paste-function', use `get-clipboard-foreign'."
+  (get-selection 'CLIPBOARD))
+
+(defun get-clipboard-foreign ()
+  "Return text pasted to the clipboard by another program.
+See `interprogram-paste-function' for more information."
+  (get-selection-foreign 'CLIPBOARD))

 
 (define-device-method get-cutbuffer
   "Return the value of one of the cut buffers.
 This will do nothing under anything other than X.")
 
 
 (define-device-method get-cutbuffer
   "Return the value of one of the cut buffers.
 This will do nothing under anything other than X.")
 

-(defun get-selection (&optional type data-type)
-  "Return the value of a Windows selection.
+(defun get-selection-no-error (&optional type data-type)
+  "Return the value of a window-system selection.

 The argument TYPE (default `PRIMARY') says which selection,
 and the argument DATA-TYPE (default `STRING', or `COMPOUND_TEXT' under Mule)
 The argument TYPE (default `PRIMARY') says which selection,
 and the argument DATA-TYPE (default `STRING', or `COMPOUND_TEXT' under Mule)

-says how to convert the data. If there is no selection an error is signalled."
-  (let ((text (get-selection-no-error type data-type)))
-    (when (not (stringp text))
-      (error "Selection is not a string: %S" text))
-    text))
+says how to convert the data. Returns NIL if there is no selection."
+  (condition-case nil (get-selection type data-type) (t nil)))

 
 

-(defun get-selection-no-error (&optional type data-type)
-  "Return the value of a Windows selection.
+(defun get-selection (&optional type data-type)
+  "Return the value of a window-system selection.

 The argument TYPE (default `PRIMARY') says which selection,
 and the argument DATA-TYPE (default `STRING', or `COMPOUND_TEXT' under Mule)
 The argument TYPE (default `PRIMARY') says which selection,
 and the argument DATA-TYPE (default `STRING', or `COMPOUND_TEXT' under Mule)

-says how to convert the data. Returns NIL if there is no selection"
+says how to convert the data. If there is no selection an error is signalled.
+Not suitable in a `interprogram-paste-function', q.v."

   (or type (setq type 'PRIMARY))
   (or data-type (setq data-type selected-text-type))
   (or type (setq type 'PRIMARY))
   (or data-type (setq data-type selected-text-type))

-  (let ((text
-        (if (consp data-type)
-            (condition-case err
-                (get-selection-internal type (car data-type))
-              (selection-conversion-error
-               (if (cdr data-type)
-                   (get-selection type (cdr data-type))
-                 (signal (car err) (cdr err)))))
-          (get-selection-internal type data-type))))
-    (when (and (consp text) (symbolp (car text)))
-      (setq text (cdr text)))
-    text))
+  (if (consp data-type)
+      (condition-case err
+         (get-selection-internal type (car data-type))
+       (selection-conversion-error
+        (if (cdr data-type)
+            (get-selection type (cdr data-type))
+          (signal (car err) (cdr err)))))
+    (get-selection-internal type data-type)))
+
+(defun get-selection-foreign (&optional type data-type)
+  "Return the value of a window-system selection, or nil if XEmacs owns it.
+The argument TYPE (default `PRIMARY') says which selection,
+and the argument DATA-TYPE (default `STRING', or `COMPOUND_TEXT' under Mule)
+says how to convert the data. If there is no selection an error is signalled.
+See `interprogram-paste-function' for more information."
+  (unless (selection-owner-p type)
+    (get-selection type data-type)))

 
 ;; FSFmacs calls this `x-set-selection', and reverses the
 
 ;; FSFmacs calls this `x-set-selection', and reverses the

-;; arguments (duh ...).  This order is more logical.
-(defun own-selection (data &optional type)
-  "Make an Windows selection of type TYPE and value DATA.
+;; first two arguments (duh ...).  This order is more logical.
+(defun own-selection (data &optional type how-to-add data-type)
+  "Make a window-system selection of type TYPE and value DATA.

 The argument TYPE (default `PRIMARY') says which selection,
 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).
+and DATA specifies the contents.  DATA may be any lisp data type
+that can be converted using the function corresponding to DATA-TYPE
+in `select-converter-alist'---strings are the usual choice, but
+other types may be permissible depending on the DATA-TYPE parameter
+(if DATA-TYPE is not supplied, the default behavior is window
+system specific, but strings are always accepted).
+HOW-TO-ADD may be any of the following:
+
+  'replace-all or nil -- replace all data in the selection.
+  'replace-existing   -- replace data for specified DATA-TYPE only.
+  'append or t        -- append data to existing DATA-TYPE data.
+
+DATA-TYPE is the window-system specific data type identifier
+(see `register-selection-data-type' for more information).

 
 The selection may also be a cons of two markers pointing to the same buffer,
 or an overlay.  In these cases, the selection is considered to be the text
 
 The selection may also be a cons of two markers pointing to the same buffer,
 or an overlay.  In these cases, the selection is considered to be the text

-between the markers *at whatever time the selection is examined*.
+between the markers *at whatever time the selection is examined* (note
+that the window system clipboard does not necessarily duplicate this
+behavior - it doesn't on mswindows for example).

 Thus, editing done in the buffer after you specify the selection
 can alter the effective value of the selection.
 
 Thus, editing done in the buffer after you specify the selection
 can alter the effective value of the selection.
 

@@ -125,36 +155,32 @@ Interactively, the text of the region is used as the selection value."
   (interactive (if (not current-prefix-arg)
                   (list (read-string "Store text for pasting: "))
                 (list (substring (region-beginning) (region-end)))))
   (interactive (if (not current-prefix-arg)
                   (list (read-string "Store text for pasting: "))
                 (list (substring (region-beginning) (region-end)))))

-  ;FSFmacs huh??  It says:
-  ;; "This is for temporary compatibility with pre-release Emacs 19."
-  ;(if (stringp type)
-  ;    (setq type (intern type)))
-  (or (valid-simple-selection-p data)
-      (and (vectorp data)
-          (let ((valid t)
-                (i (1- (length data))))
-            (while (>= i 0)
-              (or (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 (null data)
-      (disown-selection-internal type)
-    (own-selection-internal type data)
-    (when (and (eq type 'PRIMARY)
-              selection-is-clipboard-p)
-      (own-selection-internal 'CLIPBOARD data)))
-  (cond ((eq type 'PRIMARY)
-        (setq primary-selection-extent
-              (select-make-extent-for-selection
-               data primary-selection-extent)))
-       ((eq type 'SECONDARY)
-        (setq secondary-selection-extent
-              (select-make-extent-for-selection
-               data secondary-selection-extent))))
-  (setq zmacs-region-stays t)
+  ;; calling own-selection-internal will mess this up, so preserve it.
+  (let ((zmacs-region-stays zmacs-region-stays))
+                                       ;FSFmacs huh??  It says:
+    ;; "This is for temporary compatibility with pre-release Emacs 19."
+                                       ;(if (stringp type)
+                                       ;    (setq type (intern type)))
+    (or type (setq type 'PRIMARY))
+    (if (null data)
+       (disown-selection-internal type)
+      (own-selection-internal type data how-to-add data-type)
+      (when (and (eq type 'PRIMARY)
+                selection-sets-clipboard)
+        (own-selection-internal 'CLIPBOARD data how-to-add data-type)))
+    (cond ((eq type 'PRIMARY)
+          (setq primary-selection-extent
+                (select-make-extent-for-selection
+                 data primary-selection-extent)))
+         ((eq type 'SECONDARY)
+          (setq secondary-selection-extent
+                (select-make-extent-for-selection
+                 data secondary-selection-extent)))))
+  ;; zmacs-region-stays is for commands, not low-level functions.
+  ;; when behaving as the latter, we better not set it, or we will
+  ;; cause unwanted sticky-region behavior in kill-region and friends.
+  (if (interactive-p)
+  (setq zmacs-region-stays t))

   data)
 
 (defun dehilight-selection (selection)
   data)
 
 (defun dehilight-selection (selection)

@@ -178,14 +204,21 @@ Interactively, the text of the region is used as the selection value."
 
 (setq lost-selection-hooks 'dehilight-selection)
 
 
 (setq lost-selection-hooks 'dehilight-selection)
 

-(defun own-clipboard (string)
-  "Paste the given string to the X Clipboard."
+(defun own-clipboard (string &optional push)
+  "Paste the given string to the window system Clipboard.
+See `interprogram-cut-function' for more information."

   (own-selection string 'CLIPBOARD))
 
 (defun disown-selection (&optional secondary-p)
   (own-selection string 'CLIPBOARD))
 
 (defun disown-selection (&optional secondary-p)

-  "Assuming we own the selection, disown it.  With an argument, discard the
-secondary selection instead of the primary selection."
-  (disown-selection-internal (if secondary-p 'SECONDARY 'PRIMARY)))
+  "Assuming we own the selection, disown it.
+With an argument, discard the secondary selection instead of the
+primary selection."
+  (disown-selection-internal (if secondary-p 'SECONDARY 'PRIMARY))
+  (when (and selection-sets-clipboard
+            (or (not secondary-p)
+                (eq secondary-p 'PRIMARY)
+                (eq secondary-p 'CLIPBOARD)))
+    (disown-selection-internal 'CLIPBOARD)))

 
 ;; from x-init.el
 ;; selections and active regions
 
 ;; from x-init.el
 ;; selections and active regions

@@ -278,6 +311,9 @@ secondary selection instead of the primary selection."
 
 ;; moved from x-select.el
 (defun valid-simple-selection-p (data)
 
 ;; moved from x-select.el
 (defun valid-simple-selection-p (data)

+  "An obsolete function that tests whether something was a valid simple
+selection using the old XEmacs selection support. You shouldn't use this
+any more, because just about anything could be a valid selection now."

   (or (stringp data)
       ;FSFmacs huh?? (symbolp data)
       (integerp data)
   (or (stringp data)
       ;FSFmacs huh?? (symbolp data)
       (integerp data)

@@ -339,11 +375,40 @@ secondary selection instead of the primary selection."
       (disown-selection nil)
       )))
 
       (disown-selection nil)
       )))
 

+\f

 ;;; Functions to convert the selection into various other selection
 ;;; 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. These are
-;;; all moved from x-select.el
-
+;;; types.
+
+;; These next three functions get called by C code...
+(defun select-convert-in (selection type value)
+  "Attempt to convert the specified external VALUE to the specified DATA-TYPE,
+for the specified SELECTION. Return nil if this is impossible, or a
+suitable internal representation otherwise."
+  (when value
+    (let ((handler-fn (cdr (assq type selection-converter-in-alist))))
+      (when handler-fn
+       (apply handler-fn (list selection type value))))))
+
+(defun select-convert-out (selection type value)
+  "Attempt to convert the specified internal VALUE for the specified DATA-TYPE
+and SELECTION. Return nil if this is impossible, or a suitable external
+representation otherwise."
+  (when value
+    (let ((handler-fn (cdr (assq type selection-converter-out-alist))))
+      (when handler-fn
+       (apply handler-fn (list selection type value))))))
+
+(defun select-coerce (selection type value)
+  "Attempt to convert the specified internal VALUE to a representation
+suitable for return from `get-selection' in the specified DATA-TYPE. Return
+nil if this is impossible, or a suitable representation otherwise."
+  (when value
+    (let ((handler-fn (cdr (assq type selection-coercion-alist))))
+      (when handler-fn
+       (apply handler-fn (list selection type value))))))
+
+;; The rest of the functions on this "page" are conversion handlers,
+;; append handlers and buffer-kill handlers.

 (defun select-convert-to-text (selection type value)
   (cond ((stringp value)
         value)
 (defun select-convert-to-text (selection type value)
   (cond ((stringp value)
         value)

@@ -369,9 +434,17 @@ secondary selection instead of the primary selection."
             (buffer-substring (car value) (cdr value)))))
        (t nil)))
 
             (buffer-substring (car value) (cdr value)))))
        (t nil)))
 

+(defun select-coerce-to-text (selection type value)
+  (select-convert-to-text selection type value))
+
+(defun select-convert-from-text (selection type value)
+  (when (stringp value)
+    value))
+

 (defun select-convert-to-string (selection type value)
   (let ((outval (select-convert-to-text selection type value)))
 (defun select-convert-to-string (selection type value)
   (let ((outval (select-convert-to-text selection type value)))

-    ;; force the string to be not in Compound Text format.
+    ;; force the string to be not in Compound Text format. This grubby
+    ;; hack will go soon, to be replaced by a more general mechanism.

     (if (stringp outval)
        (cons 'STRING outval)
       outval)))
     (if (stringp outval)
        (cons 'STRING outval)
       outval)))

@@ -399,6 +472,9 @@ secondary selection instead of the primary selection."
        (cons (ash value -16) (logand value 65535))
       nil)))
 
        (cons (ash value -16) (logand value 65535))
       nil)))
 

+(defun select-convert-from-length (selection type value)
+  (select-convert-to-length selection type value))
+

 (defun select-convert-to-targets (selection type value)
   ;; return a vector of atoms, but remove duplicates first.
   (let* ((all (cons 'TIMESTAMP (mapcar 'car selection-converter-alist)))
 (defun select-convert-to-targets (selection type value)
   ;; return a vector of atoms, but remove duplicates first.
   (let* ((all (cons 'TIMESTAMP (mapcar 'car selection-converter-alist)))

@@ -406,8 +482,6 @@ secondary selection instead of the primary selection."
     (while rest
       (cond ((memq (car rest) (cdr rest))
             (setcdr rest (delq (car rest) (cdr rest))))
     (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)))
            (t
             (setq rest (cdr rest)))))
     (apply 'vector all)))

@@ -430,6 +504,10 @@ secondary selection instead of the primary selection."
                               (error "selection is in a killed buffer"))))
        (t nil)))
 
                               (error "selection is in a killed buffer"))))
        (t nil)))
 

+(defun select-convert-from-filename (selection type value)
+  (when (stringp value)
+    value))
+

 (defun select-convert-to-charpos (selection type value)
   (let (a b tmp)
     (cond ((cond ((extentp value)
 (defun select-convert-to-charpos (selection type value)
   (let (a b tmp)
     (cond ((cond ((extentp value)

@@ -535,7 +613,7 @@ secondary selection instead of the primary selection."
   (user-full-name))
 
 (defun select-convert-to-class (selection type size)
   (user-full-name))
 
 (defun select-convert-to-class (selection type size)

-  x-emacs-application-class)
+  (symbol-value 'x-emacs-application-class))

 
 ;; 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.
 
 ;; 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.

@@ -547,13 +625,139 @@ secondary selection instead of the primary selection."
   (and (integerp value)
        (cons (ash value -16) (logand value 65535))))
 
   (and (integerp value)
        (cons (ash value -16) (logand value 65535))))
 

+;; Can convert from the following integer representations
+;;
+;;    integer
+;;    (integer . integer)
+;;    (integer integer)
+;;    (list [integer|(integer . integer)]*)
+;;    (vector [integer|(integer . integer)]*)
+;;
+;; Cons'd integers get cleaned up a little.
+
+(defun select-convert-from-integer (selection type value)
+  (cond ((integerp value)              ; Integer
+        value)
+
+       ((and (consp value)             ; (integer . integer)
+             (integerp (car value))
+             (integerp (cdr value)))
+        (if (eq (car value) 0)
+            (cdr value)
+          (if (and (eq (car value) -1)
+                   (< (cdr value) 0))
+              (cdr value)
+            value)))
+
+       ((and (listp value)             ; (integer integer)
+             (eq (length value) 2)
+             (integerp (car value))
+             (integerp (cadr value)))
+        (if (eq (car value) 0)
+            (cadr value)
+          (if (and (eq (car value) -1)
+                   (< (cdr value) 0))
+              (- (cadr value))
+            (cons (car value) (cadr value)))))
+
+       ((listp value)                  ; list
+        (if (cdr value)
+            (mapcar '(lambda (x)
+                       (select-convert-from-integer selection type x))
+                    value)
+          (select-convert-from-integer selection type (car value))))
+
+       ((vectorp value)                ; vector
+        (if (eq (length value) 1)
+            (select-convert-from-integer selection type (aref value 0))
+          (mapvector '(lambda (x)
+                       (select-convert-from-integer selection type x))
+                    value)))
+
+       (t nil)
+       ))
+

 (defun select-convert-to-atom (selection type value)
   (and (symbolp value) value))
 
 (defun select-convert-to-atom (selection type value)
   (and (symbolp value) value))
 

-(defun select-convert-to-identity (selection type value) ; used internally
-  (vector value))
+;;; CF_xxx conversions
+(defun select-convert-from-cf-text (selection type value)
+  (replace-in-string (if (string-match "\0" value)
+                        (substring value 0 (match-beginning 0))
+                      value)
+                    "\\(\r\n\\|\n\r\\)" "\n" t))
+
+(defun select-convert-to-cf-text (selection type value)
+  (let ((text (select-convert-to-text selection type value)))
+    (concat (replace-in-string text "\n" "\r\n" t) "\0")))
+
+;;; Appenders
+(defun select-append-to-text (selection type value1 value2)
+  (let ((text1 (select-convert-to-text selection 'STRING value1))
+       (text2 (select-convert-to-text selection 'STRING value2)))
+    (if (and text1 text2)
+       (concat text1 text2)
+      nil)))
+
+(defun select-append-to-string (selection type value1 value2)
+  (select-append-to-text selection type value1 value2))
+
+(defun select-append-to-compound-text (selection type value1 value2)
+  (select-append-to-text selection type value1 value2))
+
+(defun select-append-to-cf-text (selection type value1 value2)
+  (let ((text1 (select-convert-from-cf-text selection 'CF_TEXT value1))
+       (text2 (select-convert-from-cf-text selection 'CF_TEXT value2)))
+    (if (and text1 text2)
+       (select-convert-to-cf-text selection type (concat text1 text2))
+      nil)))

 
 

-(setq selection-converter-alist
+(defun select-append-default (selection type value1 value2)
+;; This appender gets used if the type is "nil" - i.e. default.
+;; It should probably have more cases implemented than it does - e.g.
+;; appending numbers to strings, etc...
+  (cond ((and (stringp value1) (stringp value2))
+        (select-append-to-string selection 'STRING value1 value2))
+       (t nil)))
+
+;;; Buffer kill handlers
+
+(defun select-buffer-killed-default (selection type value buffer)
+;; This handler gets used if the type is "nil".
+  (cond ((extentp value)
+        (if (eq (extent-object value) buffer)
+            ; If this selection is on the clipboard, grab it quick
+            (when (eq selection 'CLIPBOARD)
+              (save-excursion
+                (set-buffer (extent-object value))
+                (save-restriction
+                 (widen)
+                 (buffer-substring (extent-start-position value)
+                                   (extent-end-position value)))))
+          value))
+       ((markerp value)
+        (unless (eq (marker-buffer value) buffer)
+          value))
+       ((and (consp value)
+             (markerp (car value))
+             (markerp (cdr value)))
+        (if (or (eq (marker-buffer (car value)) buffer)
+                (eq (marker-buffer (cdr value)) buffer))
+            ; If this selection is on the clipboard, grab it quick
+            (when (eq selection 'CLIPBOARD)
+              (save-excursion
+                (set-buffer (marker-buffer (car value)))
+                (save-restriction
+                  (widen)
+                  (buffer-substring (car value) (cdr value)))))
+            value))
+       (t value)))
+
+(defun select-buffer-killed-text (selection type value buffer)
+  (select-buffer-killed-default selection type value buffer))
+
+;; Types listed in here can be selections of XEmacs
+(setq selection-converter-out-alist

       '((TEXT . select-convert-to-text)
        (STRING . select-convert-to-string)
        (COMPOUND_TEXT . select-convert-to-compound-text)
       '((TEXT . select-convert-to-text)
        (STRING . select-convert-to-string)
        (COMPOUND_TEXT . select-convert-to-compound-text)

@@ -572,7 +776,62 @@ secondary selection instead of the primary selection."
        (NAME . select-convert-to-name)
        (ATOM . select-convert-to-atom)
        (INTEGER . select-convert-to-integer)
        (NAME . select-convert-to-name)
        (ATOM . select-convert-to-atom)
        (INTEGER . select-convert-to-integer)

-       (_EMACS_INTERNAL . select-convert-to-identity)
+       (CF_TEXT . select-convert-to-cf-text)
+       ))
+
+;; Types listed here can be selections foreign to XEmacs
+(setq selection-converter-in-alist
+      '(; Specific types that get handled by generic converters
+       (COMPOUND_TEXT . select-convert-from-text)
+       (SOURCE_LOC . select-convert-from-text)
+       (OWNER_OS . select-convert-from-text)
+       (HOST_NAME . select-convert-from-text)
+       (USER . select-convert-from-text)
+       (CLASS . select-convert-from-text)
+       (NAME . select-convert-from-text)
+       ; Generic types
+       (INTEGER . select-convert-from-integer)
+       (TEXT . select-convert-from-text)
+       (STRING . select-convert-from-text)
+       (LENGTH . select-convert-from-length)
+       (FILE_NAME . select-convert-from-filename)
+       (CF_TEXT . select-convert-from-cf-text)

        ))
 
        ))
 

+;; Types listed here have special coercion functions that can munge
+;; other types. This can also be used to add special features - e.g.
+;; being able to pass a region or a cons of markers to own-selection,
+;; but getting the *current* text in the region back when calling
+;; get-selection.
+;;
+;; Any function listed in here *will be called* whenever a value of
+;; its type is retrieved from the internal selection cache, or when
+;; no suitable values could be found in which case XEmacs looks for
+;; values with types listed in selection-coercible-types.
+(setq selection-coercion-alist
+      '((TEXT . select-coerce-to-text)
+       (STRING . select-coerce-to-text)
+       (COMPOUND_TEXT . select-coerce-to-text)
+       (CF_TEXT . select-coerce-to-text)))
+
+;; Types listed here can be appended by own-selection
+(setq selection-appender-alist
+      '((nil . select-append-default)
+       (TEXT . select-append-to-text)
+       (STRING . select-append-to-string)
+       (COMPOUND_TEXT . select-append-to-compound-text)
+       (CF_TEXT . select-append-to-cf-text)
+       ))
+
+;; Types listed here have buffer-kill handlers
+(setq selection-buffer-killed-alist
+      '((nil . select-buffer-killed-default)
+       (TEXT . select-buffer-killed-text)
+       (STRING . select-buffer-killed-text)
+       (COMPOUND_TEXT . select-buffer-killed-text)
+       (CF_TEXT . select-buffer-killed-text)))
+
+;; Lists of types that are coercible (can be converted to other types)
+(setq selection-coercible-types '(TEXT STRING COMPOUND_TEXT))
+

 ;;; select.el ends here
 ;;; select.el ends here