--- /dev/null
+;;; mule-charset.el --- Charset functions for Mule.
+
+;; Copyright (C) 1992 Free Software Foundation, Inc.
+;; Copyright (C) 1995 Amdahl Corporation.
+;; Copyright (C) 1996 Sun Microsystems.
+
+;; Author: Unknown
+;; Keywords: i18n, mule, internal
+
+;; This file is part of XEmacs.
+
+;; 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.
+
+;;; Synched up with: Not synched. API at source level synched with FSF 20.3.9.
+
+;;; Commentary:
+
+;; These functions are not compatible at the bytecode level with Emacs/Mule,
+;; and they never will be. -sb [1999-05-26]
+
+;;; Code:
+\f
+;;;; Classifying text according to charsets
+
+(defun charsets-in-region (start end &optional buffer)
+ "Return a list of the charsets in the region between START and END.
+BUFFER defaults to the current buffer if omitted."
+ (let (list)
+ (save-excursion
+ (if buffer
+ (set-buffer buffer))
+ (save-restriction
+ (narrow-to-region start end)
+ (goto-char (point-min))
+ (while (not (eobp))
+ (let* (prev-charset
+ (ch (char-after (point)))
+ (charset (char-charset ch)))
+ (if (not (eq prev-charset charset))
+ (progn
+ (setq prev-charset charset)
+ (or (memq charset list)
+ (setq list (cons charset list))))))
+ (forward-char))))
+ list))
+
+(defun charsets-in-string (string)
+ "Return a list of the charsets in STRING."
+ (let ((i 0)
+ (len (length string))
+ prev-charset charset list)
+ (while (< i len)
+ (setq charset (char-charset (aref string i)))
+ (if (not (eq prev-charset charset))
+ (progn
+ (setq prev-charset charset)
+ (or (memq charset list)
+ (setq list (cons charset list)))))
+ (setq i (1+ i)))
+ list))
+
+\f
+;;;; Charset accessors
+
+(defun charset-iso-graphic-plane (charset)
+ "Return the `graphic' property of CHARSET.
+See `make-charset'."
+ (charset-property charset 'graphic))
+
+(defun charset-iso-final-char (charset)
+ "Return the final byte of the ISO 2022 escape sequence designating CHARSET."
+ (charset-property charset 'final))
+
+(defun charset-chars (charset)
+ "Return the number of characters per dimension of CHARSET."
+ (charset-property charset 'chars))
+
+(defun charset-width (charset)
+ "Return the number of display columns per character of CHARSET.
+This only applies to TTY mode (under X, the actual display width can
+be automatically determined)."
+ (charset-property charset 'columns))
+
+;; #### FSFmacs returns 0
+(defun charset-direction (charset)
+ "Return the display direction (0 for `l2r' or 1 for `r2l') of CHARSET.
+Only left-to-right is currently implemented."
+ (if (eq (charset-property charset 'direction) 'l2r)
+ 0
+ 1))
+
+;; Not in Emacs/Mule
+(defun charset-registry (charset)
+ "Return the registry of CHARSET.
+This is a regular expression matching the registry field of fonts
+that can display the characters in CHARSET."
+ (charset-property charset 'registry))
+
+(defun charset-ccl-program (charset)
+ "Return the CCL program of CHARSET.
+See `make-charset'."
+ (charset-property charset 'ccl-program))
+
+(defun charset-bytes (charset)
+ "Useless in XEmacs, returns 1."
+ 1)
+
+(define-obsolete-function-alias 'charset-columns 'charset-width) ;; 19990409
+(define-obsolete-function-alias 'charset-final 'charset-iso-final-char) ;; 19990409
+(define-obsolete-function-alias 'charset-graphic 'charset-iso-graphic-plane) ;; 19990409
+(define-obsolete-function-alias 'charset-doc-string 'charset-description) ;; 19990409
+
+;;;; Define setf methods for all settable Charset properties
+
+(defsetf charset-registry set-charset-registry)
+(defsetf charset-ccl-program set-charset-ccl-program)
+
+;;; FSF compatibility functions
+(defun charset-after (&optional pos)
+ "Return charset of a character in current buffer at position POS.
+If POS is nil, it defauls to the current point.
+If POS is out of range, the value is nil."
+ (when (null pos)
+ (setq pos (point)))
+ (check-argument-type 'integerp pos)
+ (unless (or (< pos (point-min))
+ (> pos (point-max)))
+ (char-charset (char-after pos))))
+
+;; Yuck!
+;; We're not going to support this.
+;(defun charset-info (charset)
+; "Return a vector of information of CHARSET.
+;The elements of the vector are:
+; CHARSET-ID, BYTES, DIMENSION, CHARS, WIDTH, DIRECTION,
+; LEADING-CODE-BASE, LEADING-CODE-EXT,
+; ISO-FINAL-CHAR, ISO-GRAPHIC-PLANE,
+; REVERSE-CHARSET, SHORT-NAME, LONG-NAME, DESCRIPTION,
+; PLIST,
+;where
+;CHARSET-ID (integer) is the identification number of the charset.
+;BYTES (integer) is the length of multi-byte form of a character in
+; the charset: one of 1, 2, 3, and 4.
+;DIMENSION (integer) is the number of bytes to represent a character of
+;the charset: 1 or 2.
+;CHARS (integer) is the number of characters in a dimension: 94 or 96.
+;WIDTH (integer) is the number of columns a character in the charset
+; occupies on the screen: one of 0, 1, and 2.
+;DIRECTION (integer) is the rendering direction of characters in the
+; charset when rendering. If 0, render from left to right, else
+; render from right to left.
+;LEADING-CODE-BASE (integer) is the base leading-code for the
+; charset.
+;LEADING-CODE-EXT (integer) is the extended leading-code for the
+; charset. All charsets of less than 0xA0 has the value 0.
+;ISO-FINAL-CHAR (character) is the final character of the
+; corresponding ISO 2022 charset.
+;ISO-GRAPHIC-PLANE (integer) is the graphic plane to be invoked
+; while encoding to variants of ISO 2022 coding system, one of the
+; following: 0/graphic-plane-left(GL), 1/graphic-plane-right(GR).
+;REVERSE-CHARSET (integer) is the charset which differs only in
+; LEFT-TO-RIGHT value from the charset. If there's no such a
+; charset, the value is -1.
+;SHORT-NAME (string) is the short name to refer to the charset.
+;LONG-NAME (string) is the long name to refer to the charset
+;DESCRIPTION (string) is the description string of the charset.
+;PLIST (property list) may contain any type of information a user
+; want to put and get by functions `put-charset-property' and
+; `get-charset-property' respectively."
+; (vector
+; (charset-id charset)
+; 1
+; (charset-dimension charset)
+; (charset-chars charset)
+; (charset-width charset)
+; (charset-direction charset)
+; nil ;; (charset-leading-code-base (charset))
+; nil ;; (charset-leading-code-ext (charset))
+; (charset-iso-final-char charset)
+; (charset-iso-graphic-plane charset)
+; -1
+; (charset-short-name charset)
+; (charset-long-name charset)
+; (charset-description charset)
+; (charset-plist charset)))
+
+;(make-compatible 'charset-info "Don't use this if you can help it.")
+
+(defun define-charset (charset-id charset property-vector)
+ "Define CHARSET-ID as the identification number of CHARSET with INFO-VECTOR.
+If CHARSET-ID is nil, it is decided automatically, which means CHARSET is
+ treated as a private charset.
+INFO-VECTOR is a vector of the format:
+ [DIMENSION CHARS WIDTH DIRECTION ISO-FINAL-CHAR ISO-GRAPHIC-PLANE
+ SHORT-NAME LONG-NAME DESCRIPTION]
+The meanings of each elements is as follows:
+DIMENSION (integer) is the number of bytes to represent a character: 1 or 2.
+CHARS (integer) is the number of characters in a dimension: 94 or 96.
+WIDTH (integer) is the number of columns a character in the charset
+occupies on the screen: one of 0, 1, and 2.
+
+DIRECTION (integer) is the rendering direction of characters in the
+charset when rendering. If 0, render from left to right, else
+render from right to left.
+
+ISO-FINAL-CHAR (character) is the final character of the
+corresponding ISO 2022 charset.
+
+ISO-GRAPHIC-PLANE (integer) is the graphic plane to be invoked
+while encoding to variants of ISO 2022 coding system, one of the
+following: 0/graphic-plane-left(GL), 1/graphic-plane-right(GR).
+
+
+SHORT-NAME (string) is the short name to refer to the charset.
+
+LONG-NAME (string) is the long name to refer to the charset.
+
+DESCRIPTION (string) is the description string of the charset."
+ (make-charset charset (aref property-vector 8)
+ (list
+ 'short-name (aref property-vector 6)
+ 'long-name (aref property-vector 7)
+ 'dimension (aref property-vector 0)
+ 'columns (aref property-vector 2)
+ 'chars (aref property-vector 1)
+ 'final (aref property-vector 4)
+ 'graphic (aref property-vector 5)
+ 'direction (aref property-vector 3))))
+
+(make-compatible 'define-charset "")
+
+;;; Charset property
+
+(defalias 'get-charset-property 'get)
+(defalias 'put-charset-property 'put)
+(defalias 'charset-plist 'object-plist)
+(defalias 'set-charset-plist 'setplist)
+
+;; Setup auto-fill-chars for charsets that should invoke auto-filling.
+;; SPACE and NEWLIE are already set.
+(let ((l '(katakana-jisx0201
+ japanese-jisx0208 japanese-jisx0212
+ chinese-gb2312 chinese-big5-1 chinese-big5-2)))
+ (while l
+ (put-char-table (car l) t auto-fill-chars)
+ (setq l (cdr l))))
+
+;;; mule-charset.el ends here
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