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;;; coding.el --- Coding-system functions for XEmacs.
;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
;; Licensed to the Free Software Foundation.
;; Copyright (C) 1995 Amdahl Corporation.
;; Copyright (C) 1995 Sun Microsystems.
;; Copyright (C) 1997 MORIOKA Tomohiko
;; This file is part of XEmacs.
;; This file is very similar to mule-coding.el
;; XEmacs 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.
;; XEmacs 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 XEmacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;; split off of mule.el.
;;; Code:
(defalias 'check-coding-system 'get-coding-system)
(defconst modeline-multibyte-status '("%C")
"Modeline control for showing multibyte extension status.")
;; override the default value defined in loaddefs.el.
(setq-default modeline-format
(cons ""
(cons 'modeline-multibyte-status
(cdr modeline-format))))
(defun modify-coding-system-alist (target-type regexp coding-system)
"Modify one of look up tables for finding a coding system on I/O operation.
There are three of such tables, `file-coding-system-alist',
`process-coding-system-alist', and `network-coding-system-alist'.
TARGET-TYPE specifies which of them to modify.
If it is `file', it affects `file-coding-system-alist' (which see).
If it is `process', it affects `process-coding-system-alist' (which see).
If it is `network', it affects `network-coding-system-alist' (which see).
REGEXP is a regular expression matching a target of I/O operation.
The target is a file name if TARGET-TYPE is `file', a program name if
TARGET-TYPE is `process', or a network service name or a port number
to connect to if TARGET-TYPE is `network'.
CODING-SYSTEM is a coding system to perform code conversion on the I/O
operation, or a cons cell (DECODING . ENCODING) specifying the coding systems
for decoding and encoding respectively,
or a function symbol which, when called, returns such a cons cell."
(or (memq target-type '(file process network))
(error "Invalid target type: %s" target-type))
(or (stringp regexp)
(and (eq target-type 'network) (integerp regexp))
(error "Invalid regular expression: %s" regexp))
(if (symbolp coding-system)
(if (not (fboundp coding-system))
(progn
(check-coding-system coding-system)
(setq coding-system (cons coding-system coding-system))))
(check-coding-system (car coding-system))
(check-coding-system (cdr coding-system)))
(cond ((eq target-type 'file)
(let ((slot (assoc regexp file-coding-system-alist)))
(if slot
(setcdr slot coding-system)
(setq file-coding-system-alist
(cons (cons regexp coding-system)
file-coding-system-alist)))))
((eq target-type 'process)
(let ((slot (assoc regexp process-coding-system-alist)))
(if slot
(setcdr slot coding-system)
(setq process-coding-system-alist
(cons (cons regexp coding-system)
process-coding-system-alist)))))
(t
(let ((slot (assoc regexp network-coding-system-alist)))
(if slot
(setcdr slot coding-system)
(setq network-coding-system-alist
(cons (cons regexp coding-system)
network-coding-system-alist)))))))
(defsubst keyboard-coding-system ()
"Return coding-system of what is sent from terminal keyboard."
keyboard-coding-system)
(defun set-keyboard-coding-system (coding-system)
"Set the coding system used for TTY keyboard input. Currently broken."
(interactive "zkeyboard-coding-system: ")
(get-coding-system coding-system) ; correctness check
(setq keyboard-coding-system coding-system)
(if (eq (device-type) 'tty)
(set-console-tty-input-coding-system
(device-console) keyboard-coding-system))
(redraw-modeline t))
(defsubst terminal-coding-system ()
"Return coding-system of your terminal."
terminal-coding-system)
(defun set-terminal-coding-system (coding-system)
"Set the coding system used for TTY display output. Currently broken."
(interactive "zterminal-coding-system: ")
(get-coding-system coding-system) ; correctness check
(setq terminal-coding-system coding-system)
; #### should this affect all current tty consoles ?
(if (eq (device-type) 'tty)
(set-console-tty-output-coding-system
(device-console) terminal-coding-system))
(redraw-modeline t))
(defun set-pathname-coding-system (coding-system)
"Set the coding system used for file system path names."
(interactive "zPathname-coding-system: ")
(get-coding-system coding-system) ; correctness check
(setq file-name-coding-system coding-system))
(defun what-coding-system (start end &optional arg)
"Show the encoding of text in the region.
This function is meant to be called interactively;
from a Lisp program, use `detect-coding-region' instead."
(interactive "r\nP")
(princ (detect-coding-region start end)))
(defun decode-coding-string (str coding-system)
"Decode the string STR which is encoded in CODING-SYSTEM.
Does not modify STR. Returns the decoded string on successful conversion."
(with-string-as-buffer-contents
str (decode-coding-region (point-min) (point-max) coding-system)))
(defun encode-coding-string (str coding-system)
"Encode the string STR using CODING-SYSTEM.
Does not modify STR. Returns the encoded string on successful conversion."
(with-string-as-buffer-contents
str (encode-coding-region (point-min) (point-max) coding-system)))
;;;; Coding system accessors
(defun coding-system-mnemonic (coding-system)
"Return the 'mnemonic property of CODING-SYSTEM."
(coding-system-property coding-system 'mnemonic))
(defalias 'coding-system-docstring 'coding-system-doc-string)
(defun coding-system-eol-type (coding-system)
"Return the 'eol-type property of CODING-SYSTEM."
(coding-system-property coding-system 'eol-type))
(defun coding-system-eol-lf (coding-system)
"Return the 'eol-lf property of CODING-SYSTEM."
(coding-system-property coding-system 'eol-lf))
(defun coding-system-eol-crlf (coding-system)
"Return the 'eol-crlf property of CODING-SYSTEM."
(coding-system-property coding-system 'eol-crlf))
(defun coding-system-eol-cr (coding-system)
"Return the 'eol-cr property of CODING-SYSTEM."
(coding-system-property coding-system 'eol-cr))
(defun coding-system-post-read-conversion (coding-system)
"Return the 'post-read-conversion property of CODING-SYSTEM."
(coding-system-property coding-system 'post-read-conversion))
(defun coding-system-pre-write-conversion (coding-system)
"Return the 'pre-write-conversion property of CODING-SYSTEM."
(coding-system-property coding-system 'pre-write-conversion))
(defun coding-system-base (coding-system)
"Return the base coding system of CODING-SYSTEM."
(if (not (coding-system-eol-type coding-system))
coding-system
(find-coding-system
(intern
(substring
(symbol-name (coding-system-name coding-system))
0
(string-match "-unix$\\|-dos$\\|-mac$"
(symbol-name (coding-system-name coding-system))))))))
;;;; Definitions of predefined coding systems
(make-coding-system
'undecided 'undecided
"Automatic conversion."
'(mnemonic "Auto"))
;;; Make certain variables equivalent to coding-system aliases
(defun dontusethis-set-value-file-name-coding-system-handler (sym args fun harg handlers)
(define-coding-system-alias 'file-name (or (car args) 'binary)))
(dontusethis-set-symbol-value-handler
'file-name-coding-system
'set-value
'dontusethis-set-value-file-name-coding-system-handler)
(defun dontusethis-set-value-terminal-coding-system-handler (sym args fun harg handlers)
(define-coding-system-alias 'terminal (or (car args) 'binary)))
(dontusethis-set-symbol-value-handler
'terminal-coding-system
'set-value
'dontusethis-set-value-terminal-coding-system-handler)
(defun dontusethis-set-value-keyboard-coding-system-handler (sym args fun harg handlers)
(define-coding-system-alias 'keyboard (or (car args) 'binary)))
(dontusethis-set-symbol-value-handler
'keyboard-coding-system
'set-value
'dontusethis-set-value-keyboard-coding-system-handler)
(unless (boundp 'file-name-coding-system)
(setq file-name-coding-system nil))
(when (not (featurep 'mule))
;; these are so that gnus and friends work when not mule
(copy-coding-system 'undecided 'iso-8859-1)
(copy-coding-system 'undecided 'iso-8859-2)
(define-coding-system-alias 'ctext 'binary))
;; compatibility for old XEmacsen (don't use it)
(copy-coding-system 'undecided 'automatic-conversion)
(make-compatible-variable 'enable-multibyte-characters "Unimplemented")
(define-obsolete-variable-alias
'pathname-coding-system 'file-name-coding-system)
;;; mule-coding.el ends here
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