X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/a2535589a9b419920395f37ef658a3c88bf13ecb..22cc6690e717501adc7dcbb19ec910a4009e92ca:/lisp/disp-table.el

diff --git a/lisp/disp-table.el b/lisp/disp-table.el
index c0fe4dfe8a..d75dd41e70 100644
--- a/lisp/disp-table.el
+++ b/lisp/disp-table.el
@@ -1,11 +1,17 @@
-;; Functions for dealing with char tables.
-;; Copyright (C) 1987 Free Software Foundation, Inc.
+;;; disp-table.el --- functions for dealing with char tables.
+
+;; Copyright (C) 1987, 1994, 1995 Free Software Foundation, Inc.
+
+;; Author: Erik Naggum <erik@naggum.no>
+;; Based on a previous version by Howard Gayle
+;; Maintainer: FSF
+;; Keywords: i18n
 
 ;; This file is part of GNU Emacs.
 
 ;; GNU Emacs 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 1, or (at your option)
+;; the Free Software Foundation; either version 2, or (at your option)
 ;; any later version.
 
 ;; GNU Emacs is distributed in the hope that it will be useful,
@@ -17,99 +23,175 @@
 ;; along with GNU Emacs; see the file COPYING.  If not, write to
 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 
+;;; Code:
 
-;; Written by Howard Gayle.  See case-table.el for details.
-
-(require 'case-table)
-
-(defun rope-to-vector (rope)
-  (let* ((len (/ (length rope) 2))
-	 (vector (make-vector len nil))
-	 (i 0))
-    (while (< i len)
-      (aset vector i (rope-elt rope i))
-      (setq i (1+ i)))))
+(put 'display-table 'char-table-extra-slots 6)
 
-(defun describe-display-table (DT)
-  "Describe the display-table DT in a help buffer."
+;;;###autoload
+(defun make-display-table ()
+  "Return a new, empty display table."
+  (make-char-table 'display-table nil))
+
+(or standard-display-table
+    (setq standard-display-table (make-display-table)))
+
+;;; Display-table slot names.  The property value says which slot.
+
+(put 'truncation 'display-table-slot 0)
+(put 'wrap 'display-table-slot 1)
+(put 'escape 'display-table-slot 2)
+(put 'control 'display-table-slot 3)
+(put 'selective-display 'display-table-slot 4)
+(put 'vertical-border 'display-table-slot 5)
+
+;;;###autoload
+(defun display-table-slot (display-table slot)
+  "Return the value of the extra slot in DISPLAY-TABLE named SLOT.
+SLOT may be a number from 0 to 5 inclusive, or a slot name (symbol).
+Valid symbols are `truncation', `wrap', `escape', `control',
+`selective-display', and `vertical-border'."
+  (let ((slot-number
+	 (if (numberp slot) slot
+	   (or (get slot 'display-table-slot)
+	       (error "Invalid display-table slot name: %s" slot)))))
+    (char-table-extra-slot display-table slot-number)))
+
+;;;###autoload
+(defun set-display-table-slot (display-table slot value)
+  "Set the value of the extra slot in DISPLAY-TABLE named SLOT to VALUE.
+SLOT may be a number from 0 to 5 inclusive, or a name (symbol).
+Valid symbols are `truncation', `wrap', `escape', `control',
+`selective-display', and `vertical-border'."
+  (let ((slot-number
+	 (if (numberp slot) slot
+	   (or (get slot 'display-table-slot)
+	       (error "Invalid display-table slot name: %s" slot)))))
+    (set-char-table-extra-slot display-table slot-number value)))
+
+;;;###autoload
+(defun describe-display-table (dt)
+  "Describe the display table DT in a help buffer."
   (with-output-to-temp-buffer "*Help*"
-    (princ "\nTruncation glyf: ")
-    (prin1 (aref dt 256))
-    (princ "\nWrap glyf: ")
-    (prin1 (aref dt 257))
-    (princ "\nEscape glyf: ")
-    (prin1 (aref dt 258))
-    (princ "\nCtrl glyf: ")
-    (prin1 (aref dt 259))
-    (princ "\nSelective display rope: ")
-    (prin1 (rope-to-vector (aref dt 260)))
-    (princ "\nCharacter display ropes:\n")
-    (let ((vector (make-vector 256 nil))
-	  (i 0))
-      (while (< i 256)
-	(aset vector i
-	      (if (stringp (aref dt i))
-		  (rope-to-vector (aref dt i))
-		(aref dt i)))
-	(setq i (1+ i)))
-      (describe-vector vector))
+    (princ "\nTruncation glyph: ")
+    (prin1 (display-table-slot dt 'truncation))
+    (princ "\nWrap glyph: ")
+    (prin1 (display-table-slot dt 'wrap))
+    (princ "\nEscape glyph: ")
+    (prin1 (display-table-slot dt 'escape))
+    (princ "\nCtrl glyph: ")
+    (prin1 (display-table-slot dt 'control))
+    (princ "\nSelective display glyph sequence: ")
+    (prin1 (display-table-slot dt 'selective-display))
+    (princ "\nVertical window border glyph: ")
+    (prin1 (display-table-slot dt 'vertical-border))
+    (princ "\nCharacter display glyph sequences:\n")
+    (save-excursion
+      (set-buffer standard-output)
+      (let ((vector (make-vector 256 nil))
+	    (i 0))
+	(while (< i 256)
+	  (aset vector i (aref dt i))
+	  (setq i (1+ i)))
+	(describe-vector vector))
+      (help-mode))
     (print-help-return-message)))
 
+;;;###autoload
 (defun describe-current-display-table ()
-   "Describe the display-table in use in the selected window and buffer."
-   (interactive)
-   (describe-display-table
-    (or (window-display-table (selected-window))
-	buffer-display-table
-	standard-display-table)))
-
-(defun make-display-table ()
-  (make-vector 261 nil))
-
+  "Describe the display table in use in the selected window and buffer."
+  (interactive)
+  (let ((disptab (or (window-display-table (selected-window))
+		     buffer-display-table
+		     standard-display-table)))
+    (if disptab
+	(describe-display-table disptab)
+      (message "No display table"))))
+
+;;;###autoload
 (defun standard-display-8bit (l h)
-  "Display characters in the range [L, H] literally."
+  "Display characters in the range L to H literally."
   (while (<= l h)
     (if (and (>= l ?\ ) (< l 127))
-	(if standard-display-table (aset standard-display-table l nil))
-      (or standard-display-table
-	  (setq standard-display-table (make-vector 261 nil)))
-      (aset standard-display-table l l))
+	(aset standard-display-table l nil)
+      (aset standard-display-table l (vector l)))
     (setq l (1+ l))))
 
+;;;###autoload
+(defun standard-display-default (l h)
+  "Display characters in the range L to H using the default notation."
+  (while (<= l h)
+    (if (and (>= l ?\ ) (< l 127))
+	(aset standard-display-table l nil)
+      (aset standard-display-table l nil))
+    (setq l (1+ l))))
+
+;; This function does NOT take terminal-dependent escape sequences.
+;; For that, you need to go through create-glyph.  Use one of the
+;; other functions below, or roll your own.
+;;;###autoload
 (defun standard-display-ascii (c s)
-  "Display character C using string S."
-  (or standard-display-table
-      (setq standard-display-table (make-vector 261 nil)))
-  (aset standard-display-table c (apply 'make-rope (append s nil))))
+  "Display character C using printable string S."
+  (aset standard-display-table c (vconcat s)))
 
+;;;###autoload
 (defun standard-display-g1 (c sc)
-  "Display character C as character SC in the g1 character set."
-  (or standard-display-table
-      (setq standard-display-table (make-vector 261 nil)))
+  "Display character C as character SC in the g1 character set.
+This function assumes that your terminal uses the SO/SI characters;
+it is meaningless for an X frame."
+  (if window-system
+      (error "Cannot use string glyphs in a windowing system"))
   (aset standard-display-table c
-	(make-rope (create-glyf (concat "\016" (char-to-string sc) "\017")))))
+	(vector (create-glyph (concat "\016" (char-to-string sc) "\017")))))
 
+;;;###autoload
 (defun standard-display-graphic (c gc)
-  "Display character C as character GC in graphics character set."
-  (or standard-display-table
-      (setq standard-display-table (make-vector 261 nil)))
+  "Display character C as character GC in graphics character set.
+This function assumes VT100-compatible escapes; it is meaningless for an
+X frame."
+  (if window-system
+      (error "Cannot use string glyphs in a windowing system"))
   (aset standard-display-table c
-	(make-rope (create-glyf (concat "\e(0" (char-to-string gc) "\e(B")))))
+	(vector (create-glyph (concat "\e(0" (char-to-string gc) "\e(B")))))
 
+;;;###autoload
 (defun standard-display-underline (c uc)
   "Display character C as character UC plus underlining."
-  (or standard-display-table
-      (setq standard-display-table (make-vector 261 nil)))
+  (if window-system (require 'faces))
   (aset standard-display-table c
-	(make-rope (create-glyf (concat "\e[4m" (char-to-string uc) "\e[m")))))
-
-(defun create-glyf (string)
-  (let ((i 256))
-    (while (and (< i 65536) (aref glyf-table i)
-		(not (string= (aref glyf-table i) string)))
-      (setq i (1+ i)))
-    (if (= i 65536)
-	(error "No free glyf codes remain"))
-    (aset glyf-table i string)))
+	(vector 
+	 (if window-system
+	     (logior uc (lsh (face-id (internal-find-face 'underline)) 8))
+	   (create-glyph (concat "\e[4m" (char-to-string uc) "\e[m"))))))
+
+;; Allocate a glyph code to display by sending STRING to the terminal.
+;;;###autoload
+(defun create-glyph (string)
+  (if (= (length glyph-table) 65536)
+      (error "No free glyph codes remain"))
+  ;; Don't use slots that correspond to ASCII characters.
+  (if (= (length glyph-table) 32)
+      (setq glyph-table (vconcat glyph-table (make-vector 224 nil))))
+  (setq glyph-table (vconcat glyph-table (list string)))
+  (1- (length glyph-table)))
+
+;;;###autoload
+(defun standard-display-european (arg)
+  "Toggle display of European characters encoded with ISO 8859.
+When enabled, characters in the range of 160 to 255 display not
+as octal escapes, but as accented characters.
+With prefix argument, enable European character display iff arg is positive."
+  (interactive "P")
+  (if (or (<= (prefix-numeric-value arg) 0)
+	  (and (null arg)
+	       (char-table-p standard-display-table)
+	       ;; Test 161, because 160 displays as a space.
+	       (equal (aref standard-display-table 161) [161])))
+      (standard-display-default 160 255)
+    (standard-display-8bit 160 255)
+    ;; 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])))
 
 (provide 'disp-table)
+
+;;; disp-table.el ends here