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Revise selection documentation

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* doc/lispref/frames.texi (Window System Selections):
(X Selections):

* lisp/select.el (selection-coding-system): Correct
misunderstandings about the nature of selection-coding-system
under X.
This commit is contained in:
Po Lu 2023-10-26 04:50:19 +00:00
parent cfa3887e2d
commit fda07b56d9
2 changed files with 32 additions and 30 deletions
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27
doc/lispref/frames.texi
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@ -4058,11 +4058,12 @@ is used to encode selection data, and takes effect on MS-DOS,
MS-Windows and X@.
Under MS-DOS and MS-Windows, it is the coding system by which all
clipboard text will be encoded and decoded, whereas on X it merely
supplies the EOL format of the selection text sent in response to a
request for text encoded by a matching coding system; which is to say
that if its value is @code{utf-8-dos}, it will influence requests for
@code{UTF8_STRING} data, but not those for @code{STRING}.
non-ASCII clipboard text will be encoded and decoded; if set under X,
it provides the coding system calls to @code{gui-get-selection} will
decode selection data for a subset of text data types by, and also
forces replies to selection requests for the polymorphic @code{TEXT}
data type to be encoded by the @code{compound-text-with-extensions}
coding system rather than Unicode.
Its default value is the system code page under MS-Windows 95, 98 or
Me, @code{utf-16le-dos} under NT/W2K/XP, @code{iso-latin-1-dos} on
@ -4154,12 +4155,12 @@ format and data type to convert the data transferred by the selection
owner to a Lisp representation, which @code{gui-get-selection}
returns.
By default, Emacs converts selection data consisting of any series
of bytes to a unibyte string holding those bytes, that consisting of a
single 16-bit or 32-bit word as an unsigned number, and that
consisting of multiple such words as a vector of unsigned numbers.
However, Emacs applies special treatment for data from the following
conversion targets:
Emacs converts selection data consisting of any series of bytes to a
unibyte string holding those bytes, that consisting of a single 16-bit
or 32-bit word as an unsigned number, and that consisting of multiple
such words as a vector of unsigned numbers. The exceptions to this
general pattern are that Emacs applies special treatment for data from
the following conversion targets:
@table @code
@item INTEGER
@ -4384,8 +4385,8 @@ This selection converter returns selection data as:
@itemize @bullet
@item
A string of type @code{C_STRING}, if the selection contents contain no
multibyte characters, or contains 8-bit characters with all 8 bits
set.
multibyte characters, or contain ``raw 8-bit bytes'' (@pxref{Text
Representations}).
@item
A string of type @code{STRING}, if the selection contents can be

35
lisp/select.el
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@ -49,27 +49,28 @@ the current system default encoding on 9x/Me, `utf-16le-dos'
\(Unicode) on NT/W2K/XP, and `iso-latin-1-dos' on MS-DOS.
For X Windows:
When sending text via selection and clipboard, if the target
data-type matches this coding system according to the table
below, it is used for encoding the text. Otherwise (including
the case that this variable is nil), a proper coding system is
selected as below:
data-type coding system
--------- -------------
UTF8_STRING utf-8
COMPOUND_TEXT compound-text-with-extensions
STRING iso-latin-1
C_STRING raw-text-unix
This coding system replaces that of the default coding system
selection text is encoded by in reaction to a request for the
polymorphic `TEXT' selection target when its base coding system
is compatible with `compound-text' and the text being encoded
cannot be rendered Latin-1 without loss of information.
When receiving text, if this coding system is non-nil, it is used
for decoding regardless of the data-type. If this is nil, a
proper coding system is used according to the data-type as above.
It also replaces the coding system by which calls to
`gui-get-selection' decode selection requests for text data
types, which are enumerated below beside their respective coding
systems otherwise used.
DATA TYPE CODING SYSTEM
-------------------------- -------------
UTF8_STRING utf-8
text/plain\\;charset=utf-8 utf-8
COMPOUND_TEXT compound-text-with-extensions
STRING iso-latin-1
C_STRING raw-text-unix
See also the documentation of the variable `x-select-request-type' how
to control which data-type to request for receiving text.
The default value is nil."
to control which data-type to request for receiving text."
:type 'coding-system
:group 'mule
;; Default was compound-text-with-extensions in 22.x (pre-unicode).