Commit 0c861f59 authored by Kenichi Handa's avatar Kenichi Handa
Browse files

(x-selection-value): If x-select-request-type is

nil, try also STRING at last.
(x-select-request-type): Doc adjusted the change of
x-selection-value.
parent b8f931ed
......@@ -2203,55 +2203,18 @@ in the clipboard."
(defvar x-select-request-type nil
"*Data type request for X selection.
The value is nil, one of the following data types, or a list of them:
The value is one of the following data types, a list of them, or nil:
`COMPOUND_TEXT', `UTF8_STRING', `STRING', `TEXT'
If the value is nil, try `COMPOUND_TEXT' and `UTF8_STRING', and
use the more appropriate result. If both fail, try `STRING', and
then `TEXT'.
If the value is one of the above symbols, try only the specified
type.
If the value is a list of them, try each of them in the specified
order until succeed.")
order until succeed.
;; Helper function for x-selection-value. Select UTF8 or CTEXT
;; whichever is more appropriate. Here, we use this heurisitcs.
;;
;; (1) If their lengthes are different, select the longer one. This
;; is because an X client may just cut off unsupported characters.
;;
;; (2) Otherwise, if they are different at Nth character, and that
;; of UTF8 is a Latin character and that of CTEXT belongs to a CJK
;; character set, select UTF8. Also select UTF8 if the Nth
;; character of UTF8 is non-ASCII where as that of CTEXT is ASCII.
;; This is because an X client may replace unsupported characters
;; with some ASCII character (typically ` ' or `?') in CTEXT.
;;
;; (3) Otherwise, select CTEXT. This is because legacy charsets are
;; better for the current Emacs, especially when the selection owner
;; is also Emacs.
(defun x-select-utf8-or-ctext (utf8 ctext)
(let ((len-utf8 (length utf8))
(len-ctext (length ctext))
(selected ctext)
(i 0)
char)
(if (/= len-utf8 len-ctext)
(if (> len-utf8 len-ctext) utf8 ctext)
(let ((result (compare-strings utf8 0 len-utf8 ctext 0 len-ctext)))
(if (eq result t)
ctext
(let ((utf8-char (aref utf8 (1- (abs result))))
(ctext-char (aref ctext (1- (abs result)))))
(if (or (and (aref (char-category-set utf8-char) ?l)
(aref (char-category-set ctext-char) ?C))
(and (>= utf8-char 128)
(< ctext-char 128)))
utf8
ctext)))))))
The value nil is the same as this list:
\(UTF8_STRING COMPOUND_TEXT STRING)
")
;; Get a selection value of type TYPE by calling x-get-selection with
;; an appropiate DATA-TYPE argument decided by `x-select-request-type'.
......@@ -2259,7 +2222,8 @@ order until succeed.")
;; error, this function return nil.
(defun x-selection-value (type)
(let ((request-type (or x-select-request-type '(UTF8_STRING COMPOUND_TEXT)))
(let ((request-type (or x-select-request-type
'(UTF8_STRING COMPOUND_TEXT STRING)))
text)
(if (consp request-type)
(while (and request-type (not text))
......
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