(define-key mule-keymap "t" 'set-terminal-coding-system)
(define-key mule-keymap "k" 'set-keyboard-coding-system)
(define-key mule-keymap "p" 'set-buffer-process-coding-system)
+(define-key mule-keymap "x" 'set-selection-coding-system)
+(define-key mule-keymap "X" 'set-next-selection-coding-system)
(define-key mule-keymap "\C-\\" 'set-input-method)
(define-key mule-keymap "c" 'universal-coding-system-argument)
(define-key mule-keymap "l" 'set-language-environment)
(setq menu-bar-final-items (cons 'mule menu-bar-final-items))
-(defvar describe-language-environment-map nil)
-(define-prefix-command 'describe-language-environment-map)
+(defvar describe-language-environment-map
+ (make-sparse-keymap "Describe Language Environment"))
-(defvar setup-language-environment-map nil)
-(define-prefix-command 'setup-language-environment-map)
+(defvar setup-language-environment-map
+ (make-sparse-keymap "Set Language Environment"))
-(defvar set-coding-system-map nil)
-(define-prefix-command 'set-coding-system-map)
+(defvar set-coding-system-map
+ (make-sparse-keymap "Set Coding System"))
(define-key-after mule-menu-keymap [describe-language-environment]
- '("Describe Language Environment" . describe-language-environment-map)
+ (cons "Describe Language Environment" describe-language-environment-map)
t)
(define-key-after mule-menu-keymap [set-language-environment]
- '("Set Language Environment" . setup-language-environment-map)
+ (cons "Set Language Environment" setup-language-environment-map)
t)
(define-key-after mule-menu-keymap [mouse-set-font]
'("Set Font/Fontset" . mouse-set-font)
'("Describe Coding Systems" . describe-coding-system)
t)
(define-key-after mule-menu-keymap [set-various-coding-system]
- '("Set Coding System" . set-coding-system-map)
+ (cons "Set Coding System" set-coding-system-map)
t)
(define-key-after mule-menu-keymap [separator-coding-system]
'("--")
(define-key-after set-coding-system-map [set-buffer-process-coding-system]
'("Buffer Process" . set-buffer-process-coding-system)
t)
-
+(define-key-after set-coding-system-map [set-selection-coding-system]
+ '("X Selection" . set-selection-coding-system)
+ t)
+(define-key-after set-coding-system-map [set-next-selection-coding-system]
+ '("Next X Selection" . set-next-selection-coding-system)
+ t)
(define-key setup-language-environment-map
[Default] '("Default" . setup-specified-language-environment))
-;; These are meaningless when running under X.
+;; These are meaningless when running under X and W32.
(put 'set-terminal-coding-system 'menu-enable
- '(not (eq window-system 'x)))
+ '(or (not window-system) (eq window-system 'pc)))
(put 'set-keyboard-coding-system 'menu-enable
- '(not (eq window-system 'x)))
+ '(or (not window-system) (eq window-system 'pc)))
;; This is meaningless when the current buffer has no process.
(put 'set-buffer-process-coding-system 'menu-enable
'(get-buffer-process (current-buffer)))
+;; These are meaningless when running under terminal.
+(put 'set-selection-coding-system 'menu-enable
+ 'window-system)
+(put 'set-next-selection-coding-system 'menu-enable
+ 'window-system)
;; This should be a single character key binding because users use it
;; very frequently while editing multilingual text. Now we can use
;;; ;; Here's an alternative key binding for X users (Shift-SPACE).
;;; (define-key global-map [?\S- ] 'toggle-input-method)
+(defun coding-system-change-eol-conversion (coding-system eol-type)
+ "Return a coding system which differs from CODING-SYSTEM in eol conversion.
+The returned coding system converts end-of-line by EOL-TYPE
+but text as the same way as CODING-SYSTEM.
+EOL-TYPE should be `unix', `dos', `mac', or nil.
+If EOL-TYPE is nil, the returned coding system detects
+how end-of-line is formatted automatically while decoding.
+
+EOL-TYPE can be specified by an integer 0, 1, or 2.
+They means `unix', `dos', and `mac' respectively."
+ (if (symbolp eol-type)
+ (setq eol-type (cond ((eq eol-type 'unix) 0)
+ ((eq eol-type 'dos) 1)
+ ((eq eol-type 'mac) 2)
+ (t eol-type))))
+ (let ((orig-eol-type (coding-system-eol-type coding-system)))
+ (if (vectorp orig-eol-type)
+ (if (not eol-type)
+ coding-system
+ (aref orig-eol-type eol-type))
+ (let ((base (coding-system-base coding-system)))
+ (if (not eol-type)
+ base
+ (if (= eol-type orig-eol-type)
+ coding-system
+ (setq orig-eol-type (coding-system-eol-type base))
+ (if (vectorp orig-eol-type)
+ (aref orig-eol-type eol-type))))))))
+
+(defun coding-system-change-text-conversion (coding-system coding)
+ "Return a coding system which differs from CODING-SYSTEM in text conversion.
+The returned coding system converts text by CODING
+but end-of-line as the same way as CODING-SYSTEM.
+If CODING is nil, the returned coding system detects
+how text is formatted automatically while decoding."
+ (if (not coding)
+ (coding-system-base coding-system)
+ (let ((eol-type (coding-system-eol-type coding-system)))
+ (coding-system-change-eol-conversion
+ coding
+ (if (numberp eol-type) (aref [unix dos mac] eol-type))))))
+
(defun toggle-enable-multibyte-characters (&optional arg)
"Change whether this buffer uses multibyte characters.
With arg, use multibyte characters if the arg is positive.
(defun universal-coding-system-argument ()
"Execute an I/O command using the specified coding system."
(interactive)
- (let* ((coding-system (read-coding-system "Coding system for following command: "))
+ (let* ((default (and buffer-file-coding-system
+ (not (eq (coding-system-type buffer-file-coding-system)
+ t))
+ buffer-file-coding-system))
+ (coding-system (read-coding-system
+ (if default
+ (format "Coding system for following command (default, %s): " default)
+ "Coding system for following command: ")
+ default))
(keyseq (read-key-sequence
(format "Command to execute with %s:" coding-system)))
(cmd (key-binding keyseq)))
o default coding system for subprocess I/O
This also sets the following values:
o default value used as file-name-coding-system for converting file names.
- o default value for the command `set-terminal-coding-system'
- o default value for the command `set-keyboard-coding-system'"
+ o default value for the command `set-terminal-coding-system' (not on MSDOS)
+ o default value for the command `set-keyboard-coding-system'."
(check-coding-system coding-system)
(setq-default buffer-file-coding-system coding-system)
- (setq default-file-name-coding-system coding-system)
- (setq default-terminal-coding-system coding-system)
+ (if default-enable-multibyte-characters
+ (setq default-file-name-coding-system coding-system))
+ ;; If coding-system is nil, honor that on MS-DOS as well, so
+ ;; that they could reset the terminal coding system.
+ (unless (and (eq window-system 'pc) coding-system)
+ (setq default-terminal-coding-system coding-system))
(setq default-keyboard-coding-system coding-system)
(setq default-process-coding-system (cons coding-system coding-system)))
+(defalias 'update-iso-coding-systems 'update-coding-systems-internal)
+(make-obsolete 'update-iso-coding-systems 'update-coding-systems-internal)
+
(defun prefer-coding-system (coding-system)
"Add CODING-SYSTEM at the front of the priority list for automatic detection.
This also sets the following coding systems:
o default coding system for subprocess I/O
This also sets the following values:
o default value used as file-name-coding-system for converting file names.
- o default value for the command `set-terminal-coding-system'
- o default value for the command `set-keyboard-coding-system'"
+ o default value for the command `set-terminal-coding-system' (not on MSDOS)
+ o default value for the command `set-keyboard-coding-system'
+
+If CODING-SYSTEM specifies a certain type of EOL conversion, the coding
+systems set by this function will use that type of EOL conversion.
+
+This command does not change the default value of terminal coding system
+for MS-DOS terminal, because DOS terminals only support a single coding
+system, and Emacs automatically sets the default to that coding system at
+startup."
(interactive "zPrefer coding system: ")
(if (not (and coding-system (coding-system-p coding-system)))
(error "Invalid coding system `%s'" coding-system))
(let ((coding-category (coding-system-category coding-system))
- (base (coding-system-base coding-system)))
+ (base (coding-system-base coding-system))
+ (eol-type (coding-system-eol-type coding-system)))
(if (not coding-category)
;; CODING-SYSTEM is no-conversion or undecided.
(error "Can't prefer the coding system `%s'" coding-system))
(set coding-category (or base coding-system))
- (update-iso-coding-systems)
- (if (not (eq coding-category (car coding-category-list)))
+ (update-coding-systems-internal)
+ (or (eq coding-category (car coding-category-list))
;; We must change the order.
- (setq coding-category-list
- (cons coding-category
- (delq coding-category coding-category-list))))
+ (set-coding-priority (list coding-category)))
(if (and base (interactive-p))
(message "Highest priority is set to %s (base of %s)"
base coding-system))
- (set-default-coding-systems (or base coding-system))))
-
-(defun subset-p (list1 list2)
+ ;; If they asked for specific EOL conversion, honor that.
+ (if (memq eol-type '(0 1 2))
+ (setq coding-system
+ (coding-system-change-eol-conversion base eol-type))
+ (setq coding-system base))
+ (set-default-coding-systems coding-system)))
+
+(defun find-coding-systems-region-subset-p (list1 list2)
"Return non-nil if all elements in LIST1 are included in LIST2.
Comparison done with EQ."
(catch 'tag
All coding systems in the list can safely encode any multibyte characters
in the text.
-If the text contains no multibyte charcters, return a list of a single
+If the text contains no multibyte characters, return a list of a single
element `undecided'."
(find-coding-systems-for-charsets (find-charset-region from to)))
All coding systems in the list can safely encode any multibyte characters
in STRING.
-If STRING contains no multibyte charcters, return a list of a single
+If STRING contains no multibyte characters, return a list of a single
element `undecided'."
(find-coding-systems-for-charsets (find-charset-string string)))
(and (= (length charsets) 1)
(eq 'ascii (car charsets))))
'(undecided)
- (let ((l coding-system-list)
- (prefered-codings
+ (setq charsets (delq 'composition charsets))
+ (let ((l (coding-system-list 'base-only))
+ (charset-prefered-codings
(mapcar (function
(lambda (x)
- (get-charset-property x 'prefered-coding-system)))
+ (if (eq x 'unknown)
+ 'raw-text
+ (get-charset-property x 'prefered-coding-system))))
charsets))
+ (priorities (mapcar (function (lambda (x) (symbol-value x)))
+ coding-category-list))
codings coding safe)
+ (if (memq 'unknown charsets)
+ ;; The region contains invalid multibyte characters.
+ (setq l '(raw-text)))
(while l
(setq coding (car l) l (cdr l))
- (if (and (eq coding (coding-system-base coding))
- (setq safe (coding-system-get coding 'safe-charsets))
+ (if (and (setq safe (coding-system-get coding 'safe-charsets))
(or (eq safe t)
- (subset-p charsets safe)))
+ (find-coding-systems-region-subset-p charsets safe)))
;; We put the higher priority to coding systems included
- ;; in PREFERED-CODINGS, and within them, put the higher
- ;; priority to coding systems which support smaller
+ ;; in CHARSET-PREFERED-CODINGS, and within them, put the
+ ;; higher priority to coding systems which support smaller
;; number of charsets.
(let ((priority
- (logior (if (coding-system-get coding 'mime-charset)
- 256 0)
- (if (memq coding prefered-codings) 128 0)
- (if (> (coding-system-type coding) 0) 64 0)
- (if (consp safe) (- 64 (length safe)) 0))))
+ (+ (if (coding-system-get coding 'mime-charset) 4096 0)
+ (lsh (length (memq coding priorities)) 7)
+ (if (memq coding charset-prefered-codings) 64 0)
+ (if (> (coding-system-type coding) 0) 32 0)
+ (if (consp safe) (- 32 (length safe)) 0))))
(setq codings (cons (cons priority coding) codings)))))
(mapcar 'cdr
(sort codings (function (lambda (x y) (> (car x) (car y))))))
)))
+(defun find-multibyte-characters (from to &optional maxcount excludes)
+ "Find multibyte characters in the region specified by FROM and TO.
+If FROM is a string, find multibyte characters in the string.
+The return value is an alist of the following format:
+ ((CHARSET COUNT CHAR ...) ...)
+where
+ CHARSET is a character set,
+ COUNT is a number of characters,
+ CHARs are found characters of the character set.
+Optional 3rd arg MAXCOUNT limits how many CHARs are put in the above list.
+Optional 4th arg EXCLUDE is a list of character sets to be ignored.
+
+For invalid characters, CHARs are actually strings."
+ (let ((chars nil)
+ charset char)
+ (if (stringp from)
+ (let ((idx 0))
+ (while (setq idx (string-match "[^\000-\177]" from idx))
+ (setq char (aref from idx)
+ charset (char-charset char))
+ (if (eq charset 'unknown)
+ (setq char (match-string 0)))
+ (if (or (eq charset 'unknown)
+ (not (or (eq excludes t) (memq charset excludes))))
+ (let ((slot (assq charset chars)))
+ (if slot
+ (if (not (memq char (nthcdr 2 slot)))
+ (let ((count (nth 1 slot)))
+ (setcar (cdr slot) (1+ count))
+ (if (or (not maxcount) (< count maxcount))
+ (nconc slot (list char)))))
+ (setq chars (cons (list charset 1 char) chars)))))
+ (setq idx (1+ idx))))
+ (save-excursion
+ (goto-char from)
+ (while (re-search-forward "[^\000-\177]" to t)
+ (setq char (preceding-char)
+ charset (char-charset char))
+ (if (eq charset 'unknown)
+ (setq char (match-string 0)))
+ (if (or (eq charset 'unknown)
+ (not (or (eq excludes t) (memq charset excludes))))
+ (let ((slot (assq charset chars)))
+ (if slot
+ (if (not (member char (nthcdr 2 slot)))
+ (let ((count (nth 1 slot)))
+ (setcar (cdr slot) (1+ count))
+ (if (or (not maxcount) (< count maxcount))
+ (nconc slot (list char)))))
+ (setq chars (cons (list charset 1 char) chars))))))))
+ (nreverse chars)))
+
+(defvar last-coding-system-specified nil
+ "Most recent coding system explicitly specified by the user when asked.
+This variable is set whenever Emacs asks the user which coding system
+to use in order to write a file. If you set it to nil explicitly,
+then call `write-region', then afterward this variable will be non-nil
+only if the user was explicitly asked and specified a coding system.")
+
(defun select-safe-coding-system (from to &optional default-coding-system)
"Ask a user to select a safe coding system from candidates.
The candidates of coding systems which can safely encode a text
and TO is ignored."
(or default-coding-system
(setq default-coding-system buffer-file-coding-system))
- (let ((safe-coding-systems (if (stringp from)
- (find-coding-systems-string from)
- (find-coding-systems-region from to))))
- (if (or (eq (car safe-coding-systems) 'undecided)
+ (let* ((charsets (if (stringp from) (find-charset-string from)
+ (find-charset-region from to)))
+ (safe-coding-systems (find-coding-systems-for-charsets charsets)))
+ (if (or (not enable-multibyte-characters)
+ (eq (car safe-coding-systems) 'undecided)
+ (eq default-coding-system 'no-conversion)
(and default-coding-system
(memq (coding-system-base default-coding-system)
safe-coding-systems)))
default-coding-system
- ;; Ask a user to select a proper coding system.
- (save-window-excursion
- ;; At first, show a helpful message.
- (with-output-to-temp-buffer "*Warning*"
- (save-excursion
- (set-buffer standard-output)
- (insert (format "\
-The target text contains a multibyte character which can't be
-encoded safely by the coding system %s.
+ ;; At first, change each coding system to the corresponding
+ ;; mime-charset name if it is also a coding system.
+ (let ((l safe-coding-systems)
+ mime-charset)
+ (while l
+ (setq mime-charset (coding-system-get (car l) 'mime-charset))
+ (if (and mime-charset (coding-system-p mime-charset))
+ (setcar l mime-charset))
+ (setq l (cdr l))))
+
+ (let ((non-safe-chars (find-multibyte-characters
+ from to 3
+ (and default-coding-system
+ (coding-system-get default-coding-system
+ 'safe-charsets))))
+ overlays)
+ (save-excursion
+ ;; Highlight characters that default-coding-system can't encode.
+ (when (integerp from)
+ (goto-char from)
+ (let ((found nil))
+ (while (and (not found)
+ (re-search-forward "[^\000-\177]" to t))
+ (setq found (assq (char-charset (preceding-char))
+ non-safe-chars))))
+ (beginning-of-line)
+ (set-window-start (selected-window) (point))
+ (save-excursion
+ (while (and (< (length overlays) 256)
+ (re-search-forward "[^\000-\177]" to t))
+ (let* ((char (preceding-char))
+ (charset (char-charset char)))
+ (when (assq charset non-safe-chars)
+ (setq overlays (cons (make-overlay (1- (point)) (point))
+ overlays))
+ (overlay-put (car overlays) 'face 'highlight))))))
+
+ ;; At last, ask a user to select a proper coding system.
+ (unwind-protect
+ (save-window-excursion
+ ;; At first, show a helpful message.
+ (with-output-to-temp-buffer "*Warning*"
+ (save-excursion
+ (set-buffer standard-output)
+ (insert "The target text contains the following non ASCII character(s):\n")
+ (let ((len (length non-safe-chars))
+ (shown 0))
+ (while (and non-safe-chars (< shown 3))
+ (when (> (length (car non-safe-chars)) 2)
+ (setq shown (1+ shown))
+ (insert (format "%25s: " (car (car non-safe-chars))))
+ (let ((l (nthcdr 2 (car non-safe-chars))))
+ (while l
+ (if (or (stringp (car l)) (char-valid-p (car l)))
+ (insert (car l)))
+ (setq l (cdr l))))
+ (if (> (nth 1 (car non-safe-chars)) 3)
+ (insert "..."))
+ (insert "\n"))
+ (setq non-safe-chars (cdr non-safe-chars)))
+ (if (< shown len)
+ (insert (format "%27s\n" "..."))))
+ (insert (format "\
+These can't be encoded safely by the coding system %s.
Please select one from the following safe coding systems:\n"
- default-coding-system))
- (let ((pos (point))
- (fill-prefix " "))
- (mapcar (function (lambda (x) (princ " ") (princ x)))
- safe-coding-systems)
- (fill-region-as-paragraph pos (point)))))
-
- ;; Read a coding system.
- (let* ((safe-names (mapcar (lambda (x) (list (symbol-name x)))
- safe-coding-systems))
- (name (completing-read
- (format "Select coding system (default %s): "
- (car safe-coding-systems))
- safe-names nil t nil nil (car (car safe-names)))))
- (kill-buffer "*Warning*")
- (intern name))))))
+ default-coding-system))
+ (let ((pos (point))
+ (fill-prefix " "))
+ (mapcar (function (lambda (x) (princ " ") (princ x)))
+ safe-coding-systems)
+ (fill-region-as-paragraph pos (point)))))
+
+ ;; Read a coding system.
+ (let* ((safe-names (mapcar (lambda (x) (list (symbol-name x)))
+ safe-coding-systems))
+ (name (completing-read
+ (format "Select coding system (default %s): "
+ (car safe-coding-systems))
+ safe-names nil t nil nil
+ (car (car safe-names)))))
+ (setq last-coding-system-specified (intern name))
+ (if (integerp (coding-system-eol-type default-coding-system))
+ (setq last-coding-system-specified
+ (coding-system-change-eol-conversion
+ last-coding-system-specified
+ (coding-system-eol-type default-coding-system))))
+ last-coding-system-specified))
+ (kill-buffer "*Warning*")
+ (while overlays
+ (delete-overlay (car overlays))
+ (setq overlays (cdr overlays)))))))))
(setq select-safe-coding-system-function 'select-safe-coding-system)
+(defun select-message-coding-system ()
+ "Return a coding system to encode the outgoing message of the current buffer.
+It at first tries the first coding system found in these variables
+in this order:
+ (1) local value of `buffer-file-coding-system'
+ (2) value of `sendmail-coding-system'
+ (3) value of `default-buffer-file-coding-system'
+ (4) value of `default-sendmail-coding-system'
+If the found coding system can't encode the current buffer,
+or none of them are bound to a coding system,
+it asks the user to select a proper coding system."
+ (let ((coding (or (and (local-variable-p 'buffer-file-coding-system)
+ buffer-file-coding-system)
+ sendmail-coding-system
+ default-buffer-file-coding-system
+ default-sendmail-coding-system)))
+ (if (eq coding 'no-conversion)
+ ;; We should never use no-conversion for outgoing mails.
+ (setq coding nil))
+ (if (fboundp select-safe-coding-system-function)
+ (funcall select-safe-coding-system-function
+ (point-min) (point-max) coding)
+ coding)))
\f
-;;; Language support staffs.
+;;; Language support stuff.
(defvar language-info-alist nil
- "Alist of language names vs the corresponding information of various kind.
+ "Alist of language environment definitions.
Each element looks like:
(LANGUAGE-NAME . ((KEY . INFO) ...))
-where LANGUAGE-NAME is a string,
-KEY is a symbol denoting the kind of information,
-INFO is any Lisp object which contains the actual information related
-to KEY.")
-
-(defun get-language-info (language-name key)
- "Return the information for LANGUAGE-NAME of the kind KEY.
-KEY is a symbol denoting the kind of required information."
- (if (symbolp language-name)
- (setq language-name (symbol-name language-name)))
- (let ((lang-slot (assoc-ignore-case language-name language-info-alist)))
+where LANGUAGE-NAME is a string, the name of the language environment,
+KEY is a symbol denoting the kind of information, and
+INFO is the data associated with KEY.
+Meaningful values for KEY include
+
+ documentation value is documentation of what this language environment
+ is meant for, and how to use it.
+ charset value is a list of the character sets used by this
+ language environment.
+ sample-text value is one line of text,
+ written using those character sets,
+ appropriate for this language environment.
+ setup-function value is a function to call to switch to this
+ language environment.
+ exit-function value is a function to call to leave this
+ language environment.
+ coding-system value is a list of coding systems that are good
+ for saving text written in this language environment.
+ This list serves as suggestions to the user;
+ in effect, as a kind of documentation.
+ coding-priority value is a list of coding systems for this language
+ environment, in order of decreasing priority.
+ This is used to set up the coding system priority
+ list when you switch to this language environment.
+ nonascii-translation
+ value is a translation table to be set in the
+ variable `nonascii-translation-table' in this
+ language environment, or a character set from
+ which `nonascii-insert-offset' is calculated.
+ input-method value is a default input method for this language
+ environment.
+ features value is a list of features requested in this
+ language environment.
+
+The following keys take effect only when multibyte characters are
+globally disabled, i.e. the value of `default-enable-multibyte-characters'
+is nil.
+
+ unibyte-syntax value is a library name to load to set
+ unibyte 8-bit character syntaxes for this
+ language environment.
+
+ unibyte-display value is a coding system to encode characters
+ for the terminal. Characters in the range
+ of 160 to 255 display not as octal escapes,
+ but as non-ASCII characters in this language
+ environment.")
+
+(defun get-language-info (lang-env key)
+ "Return information listed under KEY for language environment LANG-ENV.
+KEY is a symbol denoting the kind of information.
+For a list of useful values for KEY and their meanings,
+see `language-info-alist'."
+ (if (symbolp lang-env)
+ (setq lang-env (symbol-name lang-env)))
+ (let ((lang-slot (assoc-ignore-case lang-env language-info-alist)))
(if lang-slot
(cdr (assq key (cdr lang-slot))))))
-(defun set-language-info (language-name key info
- &optional describe-map setup-map)
- "Set for LANGUAGE-NAME the information INFO under KEY.
+(defun set-language-info (lang-env key info)
+ "Modify part of the definition of language environment LANG-ENV.
+Specifically, this stores the information INFO under KEY
+in the definition of this language environment.
KEY is a symbol denoting the kind of information.
-INFO is any Lisp object which contains the actual information specific
- to LANGUAGE-NAME.
-
-Currently, the following KEYs are used by Emacs:
-
-charset: list of charsets.
-
-coding-system: list of coding systems.
-
-coding-priority: list of coding systems ordered by priority.
-
-tutorial: a tutorial file name written in the language.
+INFO is the value for that information.
-sample-text: one line short text containing characters of the language.
-
-documentation: t or a string describing how Emacs supports the language.
- If a string is specified, it is shown before any other information
- of the language by the command `describe-language-environment'.
-
-setup-function: a function to call for setting up environment
- convenient for a user of the language.
-
-We will define more KEYs in the future. To avoid conflict,
-if you want to use your own KEY values, make them start with `user-'.
-
-Optional 4th and 5th args DESCRIBE-MAP and SETUP-MAP are keymaps to
-register LANGUAGE-NAME in the menu of `Mule'->`Describe Language
-Environment' and `Mule'->`Setup Language Environment' respectively."
- (if (symbolp language-name)
- (setq language-name (symbol-name language-name)))
+For a list of useful values for KEY and their meanings,
+see `language-info-alist'."
+ (if (symbolp lang-env)
+ (setq lang-env (symbol-name lang-env)))
(let (lang-slot key-slot)
- (setq lang-slot (assoc language-name language-info-alist))
+ (setq lang-slot (assoc lang-env language-info-alist))
(if (null lang-slot) ; If no slot for the language, add it.
- (setq lang-slot (list language-name)
+ (setq lang-slot (list lang-env)
language-info-alist (cons lang-slot language-info-alist)))
(setq key-slot (assq key lang-slot))
(if (null key-slot) ; If no slot for the key, add it.
(progn
(setq key-slot (list key))
(setcdr lang-slot (cons key-slot (cdr lang-slot)))))
- ;; Setup menu.
- (cond ((eq key 'documentation)
- (define-key-after describe-map (vector (intern language-name))
- (cons language-name 'describe-specified-language-support) t))
- ((eq key 'setup-function)
- (define-key-after setup-map (vector (intern language-name))
- (cons language-name 'setup-specified-language-environment) t)))
-
- (setcdr key-slot info)
- ))
-
-(defun set-language-info-alist (language-name alist &optional parents)
- "Set for LANGUAGE-NAME the information in ALIST.
-ALIST is an alist of KEY and INFO. See the documentation of
-`set-langauge-info' for the meanings of KEY and INFO.
-
-Optional arg PARENTS is a list of parent language environments ordered
-from the highest to the lower. If it is nil, we make LANGUAGE-NAME
-the top level language environment."
- (if (symbolp language-name)
- (setq language-name (symbol-name language-name)))
+ (setcdr key-slot info)))
+
+(defun set-language-info-alist (lang-env alist &optional parents)
+ "Store ALIST as the definition of language environment LANG-ENV.
+ALIST is an alist of KEY and INFO values. See the documentation of
+`set-language-info' for the meanings of KEY and INFO.
+
+Optional arg PARENTS is a list of parent menu names; it specifies
+where to put this language environment in the
+Describe Language Environment and Set Language Environment menus.
+For example, (\"European\") means to put this language environment
+in the European submenu in each of those two menus."
+ (if (symbolp lang-env)
+ (setq lang-env (symbol-name lang-env)))
(let ((describe-map describe-language-environment-map)
(setup-map setup-language-environment-map))
(if parents
(cons parent map) t)))
(setq setup-map (symbol-value map))
(setq l (cdr l)))))
+
+ ;; Set up menu items for this language env.
+ (let ((doc (assq 'documentation alist)))
+ (when doc
+ (define-key-after describe-map (vector (intern lang-env))
+ (cons lang-env 'describe-specified-language-support) t)))
+ (define-key-after setup-map (vector (intern lang-env))
+ (cons lang-env 'setup-specified-language-environment) t)
+
(while alist
- (set-language-info language-name (car (car alist)) (cdr (car alist))
- describe-map setup-map)
+ (set-language-info lang-env (car (car alist)) (cdr (car alist)))
(setq alist (cdr alist)))))
(defun read-language-name (key prompt &optional default)
- "Read language name which has information for KEY, prompting with PROMPT.
-DEFAULT is the default choice of language.
-This returns a language name as a string."
+ "Read a language environment name which has information for KEY.
+If KEY is nil, read any language environment.
+Prompt with PROMPT. DEFAULT is the default choice of language environment.
+This returns a language environment name as a string."
(let* ((completion-ignore-case t)
(name (completing-read prompt
language-info-alist
- (function (lambda (elm) (assq key elm)))
+ (and key
+ (function (lambda (elm) (assq key elm))))
t nil nil default)))
(if (and (> (length name) 0)
- (get-language-info name key))
+ (or (not key)
+ (get-language-info name key)))
name)))
\f
;;; Multilingual input methods.
;;; %s -- list of LEIM (Library of Emacs Input Method)
;;
;; This file contains a list of LEIM (Library of Emacs Input Method)
-;; in the same directory as this file. Loading this file registeres
+;; in the same directory as this file. Loading this file registers
;; the whole input methods in Emacs.
;;
;; Each entry has the form:
This is the input method activated automatically by the command
`toggle-input-method' (\\[toggle-input-method])."
:group 'mule
- :type 'string)
+ :type '(choice (const nil) string))
(defvar input-method-history nil
"History list for some commands that read input methods.")
(put 'describe-current-input-method-function 'permanent-local t)
(defvar input-method-alist nil
- "Alist of input method names vs the corresponding information to use it.
+ "Alist of input method names vs how to use them.
Each element has the form:
- (INPUT-METHOD LANGUAGE-NAME ACTIVATE-FUNC TITLE DESCRIPTION ...)
-See the function `register-input-method' for the meanings of each elements.")
+ (INPUT-METHOD LANGUAGE-ENV ACTIVATE-FUNC TITLE DESCRIPTION ARGS...)
+See the function `register-input-method' for the meanings of the elements.")
+
+(defun register-input-method (input-method lang-env &rest args)
+ "Register INPUT-METHOD as an input method for language environment ENV.
+INPUT-METHOD and LANG-ENV are symbols or strings.
-(defun register-input-method (input-method language-name &rest args)
- "Register INPUT-METHOD as an input method for LANGUAGE-NAME.
-INPUT-METHOD and LANGUAGE-NAME are symbols or strings.
The remaining arguments are:
- ACTIVATE-FUNC, TITLE, DESCRIPTION, and ARG ...
- where,
-ACTIVATE-FUNC is a function to call for activating this method.
-TITLE is a string shown in mode-line while this method is active,
-DESCRIPTION is a string describing about this method,
-Arguments to ACTIVATE-FUNC are INPUT-METHOD and ARGs."
- (if (symbolp language-name)
- (setq language-name (symbol-name language-name)))
+ ACTIVATE-FUNC, TITLE, DESCRIPTION, and ARGS...
+ACTIVATE-FUNC is a function to call to activate this method.
+TITLE is a string to show in the mode line when this method is active.
+DESCRIPTION is a string describing this method and what it is good for.
+The ARGS, if any, are passed as arguments to ACTIVATE-FUNC.
+All told, the arguments to ACTIVATE-FUNC are INPUT-METHOD and the ARGS.
+
+This function is mainly used in the file \"leim-list.el\" which is
+created at building time of emacs, registering all quail input methods
+contained in the emacs distribution.
+
+In case you want to register a new quail input method by yourself, be
+careful to use the same input method title as given in the third
+parameter of `quail-define-package' (if the values are different, the
+string specified in this function takes precedence).
+
+The commands `describe-input-method' and `list-input-methods' need
+this duplicated values to show some information about input methods
+without loading the affected quail packages."
+ (if (symbolp lang-env)
+ (setq lang-env (symbol-name lang-env)))
(if (symbolp input-method)
(setq input-method (symbol-name input-method)))
- (let ((info (cons language-name args))
+ (let ((info (cons lang-env args))
(slot (assoc input-method input-method-alist)))
(if slot
(setcdr slot info)
(error "No valid input method is specified")))))
(defun activate-input-method (input-method)
- "Turn INPUT-METHOD on.
-If some input method is already on, turn it off at first."
- (if (symbolp input-method)
+ "Switch to input method INPUT-METHOD for the current buffer.
+If some other input method is already active, turn it off first.
+If INPUT-METHOD is nil, deactivate any current input method."
+ (if (and input-method (symbolp input-method))
(setq input-method (symbol-name input-method)))
(if (and current-input-method
(not (string= current-input-method input-method)))
- (inactivate-input-method))
- (unless current-input-method
+ (inactivate-input-method))
+ (unless (or current-input-method (null input-method))
(let ((slot (assoc input-method input-method-alist)))
(if (null slot)
(error "Can't activate input method `%s'" input-method))
(error "Can't activate input method `%s'" input-method))))
(setq current-input-method input-method)
(setq current-input-method-title (nth 3 slot))
- (run-hooks 'input-method-activate-hook))))
+ (unwind-protect
+ (run-hooks 'input-method-activate-hook)
+ (force-mode-line-update)))))
(defun inactivate-input-method ()
"Turn off the current input method."
(unwind-protect
(run-hooks 'input-method-inactivate-hook)
(setq current-input-method nil
- current-input-method-title nil)))))
+ current-input-method-title nil)
+ (force-mode-line-update)))))
(defun set-input-method (input-method)
- "Select and turn on INPUT-METHOD.
-This sets the default input method to what you specify,
-and turn it on for the current buffer."
+ "Select and activate input method INPUT-METHOD for the current buffer.
+This also sets the default input method to the one you specify."
(interactive
(let* ((default (or (car input-method-history) default-input-method)))
(list (read-input-method-name
(defun toggle-input-method (&optional arg)
"Turn on or off a multilingual text input method for the current buffer.
-With arg, read an input method from minibuffer and turn it on.
+With no prefix argument, if some input method is currently activated,
+turn it off. Otherwise, activate an input method--the one most recently used,
+or the one specified in `default-input-method', or one read from the
+minibuffer.
-Without arg, if some input method is currently activated, turn it off,
-else turn on an input method selected last time
-or the default input method (see `default-input-method').
+With a prefix arg, read an input method from minibuffer and turn it on.
+The default is the most recent input method specified
+\(not including the currently active input method, if any).
When there's no input method to turn on, turn on what read from minibuffer."
(interactive "P")
- (let* ((default (or (car input-method-history) default-input-method)))
- (if (and current-input-method (not arg))
- (inactivate-input-method)
+ (if (and current-input-method (not arg))
+ (inactivate-input-method)
+ (let ((default (or (car input-method-history) default-input-method)))
+ (if (and arg default (equal current-input-method default)
+ (> (length input-method-history) 1))
+ (setq default (nth 1 input-method-history)))
(activate-input-method
(if (or arg (not default))
- (read-input-method-name
- (if default "Input method (default %s): " "Input method: " )
- default t)
+ (progn
+ (read-input-method-name
+ (if default "Input method (default %s): " "Input method: " )
+ default t))
default))
(or default-input-method
(setq default-input-method current-input-method)))))
(defun describe-input-method (input-method)
- "Describe input method INPUT-METHOD."
+ "Describe input method INPUT-METHOD."
(interactive
(list (read-input-method-name
"Describe input method (default, current choice): ")))
(read-input-method-name "Input method: " nil t)))
(if (and input-method (symbolp input-method))
(setq input-method (symbol-name input-method)))
- (let ((previous-input-method current-input-method))
+ (let ((prev-input-method current-input-method))
(unwind-protect
(progn
(activate-input-method input-method)
(read-string prompt initial-input nil nil t))
- (if previous-input-method
- (activate-input-method previous-input-method)
- (inactivate-input-method)))))
+ (activate-input-method prev-input-method))))
;; Variables to control behavior of input methods. All input methods
;; should react to these variables.
(defvar input-method-after-insert-chunk-hook nil
"Normal hook run just after an input method insert some chunk of text.")
+(defvar input-method-exit-on-first-char nil
+ "This flag controls a timing when an input method returns.
+Usually, the input method does not return while there's a possibility
+that it may find a different translation if a user types another key.
+But, it this flag is non-nil, the input method returns as soon as
+the current key sequence gets long enough to have some valid translation.")
+
+(defvar input-method-use-echo-area nil
+ "This flag controls how an input method shows an intermediate key sequence.
+Usually, the input method inserts the intermediate key sequence,
+or candidate translations corresponding to the sequence,
+at point in the current buffer.
+But, if this flag is non-nil, it displays them in echo area instead.")
+
(defvar input-method-exit-on-invalid-key nil
"This flag controls the behaviour of an input method on invalid key input.
Usually, when a user types a key which doesn't start any character
handled by the input method, the key is handled by turning off the
-input method temporalily. After the key is handled, the input method is
-back on.
+input method temporarily. After that key, the input method is re-enabled.
But, if this flag is non-nil, the input method is never back on.")
\f
When this hook is run, the variable `current-language-environment'
is still bound to the language environment being exited.
-This hook is mainly used for cancelling the effect of
+This hook is mainly used for canceling the effect of
`set-language-environment-hook' (which-see).")
+(put 'setup-specified-language-environment 'apropos-inhibit t)
+
(defun setup-specified-language-environment ()
- "Set up multi-lingual environment convenient for the specified language."
+ "Switch to a specified language environment."
(interactive)
(let (language-name)
(if (and (symbolp last-command-event)
(error "Bogus calling sequence"))))
(defcustom current-language-environment "English"
- "The last language environment specified with `set-language-environment'."
- :set 'set-language-environment
+ "The last language environment specified with `set-language-environment'.
+This variable should only be set with Customize, which is equivalent
+to using `set-language-environment'."
+ :link '(custom-manual "(emacs)Language Environments")
+ :set (lambda (symbol value) (set-language-environment value))
+ :get (lambda (x)
+ (or (car-safe (assoc-ignore-case
+ (if (symbolp current-language-environment)
+ (symbol-name current-language-environment)
+ current-language-environment)
+ language-info-alist))
+ "English"))
+ :type (cons 'choice (mapcar (lambda (lang)
+ (list 'const (car lang)))
+ language-info-alist))
:initialize 'custom-initialize-default
:group 'mule
:type 'string)
+(defun reset-language-environment ()
+ "Reset multilingual environment of Emacs to the default status.
+
+The default status is as follows:
+
+ The default value of buffer-file-coding-system is nil.
+ The default coding system for process I/O is nil.
+ The default value for the command `set-terminal-coding-system' is nil.
+ The default value for the command `set-keyboard-coding-system' is nil.
+
+ The order of priorities of coding categories and the coding system
+ bound to each category are as follows
+ coding category coding system
+ --------------------------------------------------
+ coding-category-iso-8-2 iso-latin-1
+ coding-category-iso-8-1 iso-latin-1
+ coding-category-iso-7-tight iso-2022-jp
+ coding-category-iso-7 iso-2022-7bit
+ coding-category-iso-7-else iso-2022-7bit-lock
+ coding-category-iso-8-else iso-2022-8bit-ss2
+ coding-category-emacs-mule emacs-mule
+ coding-category-raw-text raw-text
+ coding-category-sjis japanese-shift-jis
+ coding-category-big5 chinese-big5
+ coding-category-ccl nil
+ coding-category-binary no-conversion
+"
+ (interactive)
+ ;; This function formerly set default-enable-multibyte-characters to t,
+ ;; but that is incorrect. It should not alter the unibyte/multibyte choice.
+
+ (setq coding-category-iso-7-tight 'iso-2022-jp
+ coding-category-iso-7 'iso-2022-7bit
+ coding-category-iso-8-1 'iso-latin-1
+ coding-category-iso-8-2 'iso-latin-1
+ coding-category-iso-7-else 'iso-2022-7bit-lock
+ coding-category-iso-8-else 'iso-2022-8bit-ss2
+ coding-category-emacs-mule 'emacs-mule
+ coding-category-raw-text 'raw-text
+ coding-category-sjis 'japanese-shift-jis
+ coding-category-big5 'chinese-big5
+ coding-category-ccl nil
+ coding-category-binary 'no-conversion)
+
+ (set-coding-priority
+ '(coding-category-iso-8-1
+ coding-category-iso-8-2
+ coding-category-iso-7-tight
+ coding-category-iso-7
+ coding-category-iso-7-else
+ coding-category-iso-8-else
+ coding-category-emacs-mule
+ coding-category-raw-text
+ coding-category-sjis
+ coding-category-big5
+ coding-category-ccl
+ coding-category-binary))
+
+ (update-coding-systems-internal)
+
+ (set-default-coding-systems nil)
+ ;; Don't alter the terminal and keyboard coding systems here.
+ ;; The terminal still supports the same coding system
+ ;; that it supported a minute ago.
+;;; (set-terminal-coding-system-internal nil)
+;;; (set-keyboard-coding-system-internal nil)
+
+ (setq nonascii-translation-table nil
+ nonascii-insert-offset 0))
+
(defun set-language-environment (language-name)
"Set up multi-lingual environment for using LANGUAGE-NAME.
This sets the coding system priority and the default input method
which is the name of a language environment. For example, \"Latin-1\"
specifies the character set for the major languages of Western Europe."
(interactive (list (read-language-name
- 'setup-function
+ nil
"Set language environment (default, English): ")))
(if language-name
(if (symbolp language-name)
(setq language-name (symbol-name language-name)))
(setq language-name "English"))
- (if (null (get-language-info language-name 'setup-function))
+ (or (assoc-ignore-case language-name language-info-alist)
(error "Language environment not defined: %S" language-name))
- (unless default-enable-multibyte-characters
- (or (member (downcase language)
- '("latin-1" "latin-2" "latin-3" "latin-4" "latin-5"))
- (error "Language environment `%s' not supported in unibyte mode"))
- (standard-display-european 1 (downcase language)))
-
(if current-language-environment
(let ((func (get-language-info current-language-environment
'exit-function)))
(run-hooks 'exit-language-environment-hook)
(if (fboundp func) (funcall func))))
- (setq current-language-environment language-name)
- (funcall (get-language-info language-name 'setup-function))
+ (let ((default-eol-type (coding-system-eol-type
+ default-buffer-file-coding-system)))
+ (reset-language-environment)
+
+ (setq current-language-environment language-name)
+ (set-language-environment-coding-systems language-name default-eol-type))
+ (let ((input-method (get-language-info language-name 'input-method)))
+ (when input-method
+ (setq default-input-method input-method)
+ (if input-method-history
+ (setq input-method-history
+ (cons input-method
+ (delete input-method input-method-history))))))
+ (let ((nonascii (get-language-info language-name 'nonascii-translation)))
+ (cond
+ ((char-table-p nonascii)
+ (setq nonascii-translation-table nonascii))
+ ((eq window-system 'pc)
+ ;; DOS terminals' default is to use a special non-ASCII translation
+ ;; table as appropriate for the installed codepage.
+ (setq
+ nonascii-translation-table (symbol-value
+ (intern
+ (concat "cp"
+ dos-codepage
+ "-nonascii-translation-table")))))
+ ((charsetp nonascii)
+ (setq nonascii-insert-offset (- (make-char nonascii) 128)))))
+
+ (setq charset-origin-alist
+ (get-language-info language-name 'charset-origin-alist))
+
+ ;; Unibyte setups if necessary.
+ (unless default-enable-multibyte-characters
+ ;; Syntax and case table.
+ (let ((syntax (get-language-info language-name 'unibyte-syntax)))
+ (if syntax
+ (let ((set-case-syntax-set-multibyte nil))
+ (load syntax nil t))
+ ;; No information for syntax and case. Reset to the defaults.
+ (let ((syntax-table (standard-syntax-table))
+ (case-table (standard-case-table))
+ (ch (if (eq window-system 'pc) 128 160)))
+ (while (< ch 256)
+ (modify-syntax-entry ch " " syntax-table)
+ (aset case-table ch ch)
+ (setq ch (1+ ch)))
+ (set-char-table-extra-slot case-table 0 nil)
+ (set-char-table-extra-slot case-table 1 nil)
+ (set-char-table-extra-slot case-table 2 nil))
+ (set-standard-case-table (standard-case-table))
+ (let ((list (buffer-list)))
+ (while list
+ (with-current-buffer (car list)
+ (set-case-table (standard-case-table)))
+ (setq list (cdr list))))))
+ ;; Display table and coding system for terminal.
+ (let ((coding (get-language-info language-name 'unibyte-display)))
+ (if coding
+ (standard-display-european-internal)
+ (standard-display-default (if (eq window-system 'pc) 128 160) 255)
+ (aset standard-display-table 146 nil))
+ (or (eq window-system 'pc)
+ (set-terminal-coding-system coding))))
+
+ (let ((required-features (get-language-info language-name 'features)))
+ (while required-features
+ (require (car required-features))
+ (setq required-features (cdr required-features))))
+ (let ((func (get-language-info language-name 'setup-function)))
+ (if (fboundp func)
+ (funcall func)))
(run-hooks 'set-language-environment-hook)
(force-mode-line-update t))
-(defun set-language-environment-coding-systems (language-name)
- "Do various coding system setups for language environment LANGUAGE-NAME."
+(defun standard-display-european-internal ()
+ ;; Actually set up direct output of non-ASCII characters.
+ (standard-display-8bit (if (eq window-system 'pc) 128 160) 255)
+ ;; Unibyte Emacs on MS-DOS wants to display all 8-bit characters with
+ ;; the native font, and codes 160 and 146 stand for something very
+ ;; different there.
+ (or (and (eq window-system 'pc) (not default-enable-multibyte-characters))
+ (progn
+ ;; Make non-line-break space display as a plain space.
+ ;; Most X fonts do the wrong thing for code 160.
+ (aset standard-display-table 160 [32])
+ ;; Most Windows programs send out apostrophe's as \222. Most X fonts
+ ;; don't contain a character at that position. Map it to the ASCII
+ ;; apostrophe.
+ (aset standard-display-table 146 [39]))))
+
+(defun set-language-environment-coding-systems (language-name
+ &optional eol-type)
+ "Do various coding system setups for language environment LANGUAGE-NAME.
+
+The optional arg EOL-TYPE specifies the eol-type of the default value
+of buffer-file-coding-system set by this function."
(let* ((priority (get-language-info language-name 'coding-priority))
(default-coding (car priority)))
(if priority
(let ((categories (mapcar 'coding-system-category priority)))
- (set-default-coding-systems default-coding)
+ (set-default-coding-systems
+ (if (memq eol-type '(0 1 2 unix dos mac))
+ (coding-system-change-eol-conversion default-coding eol-type)
+ default-coding))
+ (setq default-sendmail-coding-system default-coding)
(set-coding-priority categories)
(while priority
(set (car categories) (car priority))
(setq priority (cdr priority) categories (cdr categories)))
- (update-iso-coding-systems)))))
+ (update-coding-systems-internal)))))
;; Print all arguments with `princ', then print "\n".
(defsubst princ-list (&rest args)
(while args (princ (car args)) (setq args (cdr args)))
(princ "\n"))
+(put 'describe-specified-language-support 'apropos-inhibit t)
+
;; Print a language specific information such as input methods,
;; charsets, and coding systems. This function is intended to be
;; called from the menu:
(princ "Sample text:\n")
(princ-list " " str)
(terpri))))
- (princ "Input methods:\n")
- (let ((l input-method-alist))
+ (let ((input-method (get-language-info language-name 'input-method))
+ (l (copy-sequence input-method-alist)))
+ (princ "Input methods")
+ (when input-method
+ (princ (format " (default, %s)" input-method))
+ (setq input-method (assoc input-method input-method-alist))
+ (setq l (cons input-method (delete input-method l))))
+ (princ ":\n")
(while l
(if (string= language-name (nth 1 (car l)))
(princ-list " " (car (car l))
\f
;;; Charset property
-(defsubst get-charset-property (charset propname)
+(defun get-charset-property (charset propname)
"Return the value of CHARSET's PROPNAME property.
This is the last value stored with
(put-charset-property CHARSET PROPNAME VALUE)."
- (plist-get (charset-plist charset) propname))
+ (and (not (eq charset 'composition))
+ (plist-get (charset-plist charset) propname)))
-(defsubst put-charset-property (charset propname value)
+(defun put-charset-property (charset propname value)
"Store CHARSETS's PROPNAME property with value VALUE.
It can be retrieved with `(get-charset-property CHARSET PROPNAME)'."
- (set-charset-plist charset
- (plist-put (charset-plist charset) propname value)))
+ (or (eq charset 'composition)
+ (set-charset-plist charset
+ (plist-put (charset-plist charset) propname value))))
;;; Character code property
(put 'char-code-property-table 'char-table-extra-slots 0)
(nconc plist (list propname value))))
(aset char-code-property-table char (list propname value)))))
+\f
+;; Pretty description of encoded string
+
+;; Alist of ISO 2022 control code vs the corresponding mnemonic string.
+(defvar iso-2022-control-alist
+ '((?\x1b . "ESC")
+ (?\x0e . "SO")
+ (?\x0f . "SI")
+ (?\x8e . "SS2")
+ (?\x8f . "SS3")
+ (?\x9b . "CSI")))
+
+(defun encoded-string-description (str coding-system)
+ "Return a pretty description of STR that is encoded by CODING-SYSTEM."
+ (setq str (string-as-unibyte str))
+ (let ((char (aref str 0))
+ desc)
+ (when (< char 128)
+ (setq desc (or (cdr (assq char iso-2022-control-alist))
+ (char-to-string char)))
+ (let ((i 1)
+ (len (length str)))
+ (while (< i len)
+ (setq char (aref str i))
+ (if (>= char 128)
+ (setq desc nil i len)
+ (setq desc (concat desc " "
+ (or (cdr (assq char iso-2022-control-alist))
+ (char-to-string char)))
+ i (1+ i))))))
+ (or desc
+ (mapconcat (function (lambda (x) (format "0x%02x" x))) str " "))))
+
+(defun encode-coding-char (char coding-system)
+ "Encode CHAR by CODING-SYSTEM and return the resulting string.
+If CODING-SYSTEM can't safely encode CHAR, return nil."
+ (if (cmpcharp char)
+ (setq char (car (decompose-composite-char char 'list))))
+ (let ((str1 (char-to-string char))
+ (str2 (make-string 2 char))
+ (safe-charsets (and coding-system
+ (coding-system-get coding-system 'safe-charsets)))
+ enc1 enc2 i1 i2)
+ (when (or (eq safe-charsets t)
+ (memq (char-charset char) safe-charsets))
+ ;; We must find the encoded string of CHAR. But, just encoding
+ ;; CHAR will put extra control sequences (usually to designate
+ ;; ASCII charaset) at the tail if type of CODING is ISO 2022.
+ ;; To exclude such tailing bytes, we at first encode one-char
+ ;; string and two-char string, then check how many bytes at the
+ ;; tail of both encoded strings are the same.
+
+ (setq enc1 (string-as-unibyte (encode-coding-string str1 coding-system))
+ i1 (length enc1)
+ enc2 (string-as-unibyte (encode-coding-string str2 coding-system))
+ i2 (length enc2))
+ (while (and (> i1 0) (= (aref enc1 (1- i1)) (aref enc2 (1- i2))))
+ (setq i1 (1- i1) i2 (1- i2)))
+
+ ;; Now (substring enc1 i1) and (substring enc2 i2) are the same,
+ ;; and they are the extra control sequences at the tail to
+ ;; exclude.
+ (substring enc2 0 i2))))
+
+
;;; mule-cmds.el ends here
HCoop / bpt / emacs.git / blobdiff