code.delx.au - gnu-emacs/blob - lisp/term/internal.el

   1 ;;; internal.el --- support for PC internal terminal -*- coding: raw-text; -*-
   2
   3 ;; Copyright (C) 1993, 1994, 1998 Free Software Foundation, Inc.
   4
   5 ;; Author: Morten Welinder <terra@diku.dk>
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation; either version 2, or (at your option)
  12 ;; any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22 ;; Boston, MA 02111-1307, USA.
  23
  24 ;;; Code:
  25
  26 ;; ---------------------------------------------------------------------------
  27 ;; keyboard setup -- that's simple!
  28 (set-input-mode nil nil 0)
  29 (define-key function-key-map [backspace] "\177") ; Normal behaviour for BS
  30 (define-key function-key-map [delete] "\C-d")    ; ... and Delete
  31 (define-key function-key-map [tab] [?\t])
  32 (define-key function-key-map [linefeed] [?\n])
  33 (define-key function-key-map [clear] [11])
  34 (define-key function-key-map [return] [13])
  35 (define-key function-key-map [escape] [?\e])
  36 (define-key function-key-map [M-backspace] [?\M-\d])
  37 (define-key function-key-map [M-delete] [?\M-\d])
  38 (define-key function-key-map [M-tab] [?\M-\t])
  39 (define-key function-key-map [M-linefeed] [?\M-\n])
  40 (define-key function-key-map [M-clear] [?\M-\013])
  41 (define-key function-key-map [M-return] [?\M-\015])
  42 (define-key function-key-map [M-escape] [?\M-\e])
  43 (put 'backspace 'ascii-character 127)
  44 (put 'delete 'ascii-character 127)
  45 (put 'tab 'ascii-character ?\t)
  46 (put 'linefeed 'ascii-character ?\n)
  47 (put 'clear 'ascii-character 12)
  48 (put 'return 'ascii-character 13)
  49 (put 'escape 'ascii-character ?\e)
  50
  51 ;; ----------------------------------------------------------------------
  52 ;;   DOS display setup
  53 ;;   =================
  54 ;;
  55 ;;   DOS can only support a single font.  On most systems (with the
  56 ;;   possible exception of Far Eastern DOS versions), this means that
  57 ;;   two character sets are available at any given time: the ASCII
  58 ;;   charset, and a single national charset, usually mapped to codes
  59 ;;   above 128 (i.e., with 8th bit set).  Which national charset is
  60 ;;   supported depends on the codepage loaded by the system when it
  61 ;;   boots; usually, this codepage cannot be changed without
  62 ;;   rebooting.
  63 ;;
  64 ;;   Since each codepage can usually display character of a single
  65 ;;   MULE charset, Emacs can display a single MULE charset with the
  66 ;;   glyphs of the current codepage.  The mapping from DOS codepages
  67 ;;   to MULE charsets is established by the charset property of the
  68 ;;   cpNNN-decode-table variables in codepage.el, which also
  69 ;;   defines translation tables for each such pair, and a bunch of
  70 ;;   functions to generate coding systems that use those translation
  71 ;;   tables to convert codepage-encoded text to the appropriate MULE
  72 ;;   charset and back.  When Emacs starts on DOS, it automatically
  73 ;;   sets its default coding systems for file I/O and terminal output
  74 ;;   according to the currend DOS codepage, given by the
  75 ;;   `dos-codepage' variable.
  76 ;;
  77 ;;   This leaves us with the problem of displaying character sets
  78 ;;   other than the one which maps directly into the current codepage.
  79 ;;   The following functions and variables handle this nuisance by
  80 ;;   defining a display table where each character that doesn't have a
  81 ;;   glyph in some codepage is mapped to a string which represents it.
  82 ;;   For example, a small c with cedilla is mapped to the string
  83 ;;   "{,c}" (the braces serve as a sign that this is a single
  84 ;;   character).  A nice feature of the display tables is that Emacs
  85 ;;   knows that the string represents a single character, and thus
  86 ;;   cursor motion works as you'd expect: a single `C-f' moves past
  87 ;;   the entire string which represents a single character.
  88 ;; ----------------------------------------------------------------------
  89
  90 (defvar IT-character-translations
  91   '(
  92     (latin-iso8859-1
  93      . [255 "!I" "|c" "Pd" "$$" "Ye" "|" "SE" "\"" "(c)"
  94         "_a" "<<" "~" "--" "(R)" "'-" "^o" "+-" "^2" "^3"
  95         "'" "u" ".P" "^." "'," "^1" "_o" ">>" "1/4" "1/2"
  96         "3/4" "?I" "`A" "A'" "A^" "~A" "\"A" "Ao" "AE" ",C"
  97         "`E" "E'" "E^" "\"E" "`I" "I'" "I^" "\"I" "D-" "~N"
  98         "`O" "O'" "O^" "~O" "\"O" "*x" "/O" "`U" "U'" "U^"
  99         "\"U" "Y'" "TH" "ss" "`a" "a'" "a^" "~a" "\"a" "ao"
 100         "ae" ",c" "`e" "e'" "e^" "\"e" "`i" "i'" "i^" "\"i"
 101         "d-" "~n" "`o" "o'" "o^" "~o" "\"o" "-:" "/o" "`u"
 102         "u'" "u^" "\"u" "y'" "th" "\"y"]
 103      )
 104     (latin-iso8859-2
 105      . [255 "A;" "'(" "/L" "$$" "L<" "S'" "SE" "\"" "S<"
 106         ",S" "T<" "Z'" "--" "Z<" "Z^." "^o" "a;" "';" "/l"
 107         "'" "l<" "s'" "'<" "'," "s<" ",s" "t<" "z'" "'"
 108         "z<" "z^." "R'" "A'" "A^" "A(" "\"A" "L'" "C'" ",C"
 109         "C<" "E'" "E;" "E:" "E<" "I'" "I^" "D<" "/D" "N'"
 110         "N<" "O'" "O^" "O''" "\"O" "*x" "R<" "U^0" "U'" "U''"
 111         "\"U" "Y'" ",T" "ss" "r'" "a'" "a^" "a(" "\"a" "l'"
 112         "c'" ",c" "c<" "e'" "e;" "\"e" "e<" "i'" "i^" "d<"
 113         "/d" "n'" "n<" "o'" "o^" "o''" "\"o" "-:" "r<" "u^0"
 114         "u'" "u''" "\"u" "y'" ",t" "'."]
 115      )
 116     (latin-iso8859-3
 117      . [255 "/H" "'(" "Pd" "$$" " " "H^" "SE" "\"" "I^."
 118         ",S" "G(" "J^" "--" " " "Z^." "^o" "/h" "^2" "^3"
 119         "'" "u" "h^" "." "'," "i^." ",s" "g(" "j^" "1/2"
 120         " " "z^." "`A" "A'" "A^" " " "\"A" "C^." "C^" ",C"
 121         "`E" "E'" "E^" "\"E" "`I" "I'" "I^" "\"I" " " "~N"
 122         "`O" "O'" "O^" "G^." "\"O" "*x" "G^" "`U" "U'" "U^"
 123         "\"U" "U(" "S^" "ss" "`a" "a'" "a^" " " "\"a" "c^."
 124         "c^" ",c" "`e" "e'" "e^" "\"e" "`i" "i'" "i^" "\"i"
 125         " " "~n" "`o" "o'" "o^" "g^." "\"o" "-:" "g^" "`u"
 126         "u'" "u^" "\"u" "u(" "s^" "^."]
 127      )
 128     (latin-iso8859-4
 129      . [255 "A;" "kk" ",R" "$$" "?I" ",L" "SE" "\"" "S<"
 130         "E-" ",G" "/T" "--" "Z<" "'-" "^o" "a;" "';" ",r"
 131         "'" "~i" ",l" "'<" "'," "s<" "e-" ",g" "/t" "NG"
 132         "z<" "ng" "A-" "A'" "A^" "~A" "\"A" "Ao" "AE" "I;"
 133         "C<" "E'" "E;" "\"E" "E^." "I'" "I^" "I-" "/D" ",N"
 134         "O-" ",K" "O^" "~O" "\"O" "*x" "/O" "U;" "U'" "U^"
 135         "\"U" "~U" "U-" "ss" "a-" "a'" "a^" "~a" "\"a" "ao"
 136         "ae" "i;" "c<" "e'" "e;" "\"e" "e^." "i'" "i^" "i-"
 137         "/d" ",n" "o-" ",k" "o^" "~o" "\"o" "-:" "/o" "u;"
 138         "u'" "u^" "\"u" "~u" "u-" "^."]
 139      )
 140     (cyrillic-iso8859-5
 141      . [255 "\"E" "Dj" "Gj" "IE" "Dz" "Ii" "Ji" "JE" "Lj"
 142         "Nj" "Ts" "Kj" 240 "V%" "Dzh"  65  "B="  66 226
 143         68  69  "Z%"  51  85 "J="  75 "L="  77  72
 144         79  "P="  80  67  84  89 232  88 "C=" "C%"
 145         "S%" "Sc" "=\"" "Y=" "%\"" "Ee" "Yu" "Ya" 97  98
 146         "v=" "g=" 103 101 "z%" "z=" 117 "j=" 107 "l="
 147         "m=" "n=" 111 110 112 99 "t=" 121 "f=" 120
 148         "c=" "c%" "s%" "sc" "='" "y=" "%'" "ee" "yu" "ya"
 149         "N0" "\"e" "dj" "gj" "ie" "dz" "ii" "ji" "je" "lj"
 150         "nj" "ts" "kj"  21 "v%" "dzh"]
 151      )
 152     (arabic-iso8859-6
 153      . [255 nil nil nil "$$" nil nil nil nil nil
 154         nil nil ",+" "--" nil nil nil nil nil nil
 155         nil nil nil nil nil nil nil ";+" nil nil
 156         nil "?+" nil "H'" "aM" "aH" "wH" "ah" "yH"
 157         "a+" "b+" "tm" "t+" "tk" "g+" "hk" "x+" "d+" "dk"
 158         "r+" "z+" "s+" "sn" "c+" "dd" "tj" "zH" "e+" "i+"
 159         nil nil nil nil nil "++" "f+" "q+" "k+" "l+"
 160         "m+" "n+" "h+" "w+" "j+" "y+" ":+" "\"+" "=+" "/+"
 161         "'+" "1+" "3+" "0+" nil nil nil nil nil nil
 162         nil nil nil nil nil nil nil]
 163      )
 164     (greek-iso8859-7
 165      . [255 "9'" "'9" "Pd" nil nil "|" "SE" "\"" "(c)"
 166         nil "<<" "~" "--" nil "-M" "^o" "+-" "^2" "^3"
 167         "'" "'%" "A%" "^." "E%" "Y%" "I%" ">>" "O%" "1/2"
 168         "U%" "W%" "i3" "A*" "B*" "G*" "D*" "E*" "Z*" "Y*"
 169         "H*" "I*" "K*" "L*" "M*" "N*" "C*" "O*" "P*" "R*"
 170         nil "S*" "T*" "U*" "F*" "X*" "Q*" "W*" "J*" "V*"
 171         "a%" "e%" "y%" "i%" "u3" "a*" "b*" "g*" "d*" "e*"
 172         "z*" "y*" "h*" "i*" "k*" "l*" "m*" "n*" "c*" "o*"
 173         "p*" "r*" "*s" "s*" "t*" "u*" "f*" "x*" "q*" "w*"
 174         "j*" "v*" "o%" "u%" "w%" nil]
 175      )
 176     (hebrew-iso8859-8
 177      . [255 nil "|c" "Pd" "$$" "Ye" "|" "SE" "\"" "(c)"
 178         "*x" "<<" "~" "--" "(R)" "'-" "^o" "+-" "^2" "^3"
 179         "'" "u" ".P" "^." "'," "^1" "-:" ">>" "1/4" "1/2"
 180         "3/4" nil nil nil nil nil nil nil nil nil
 181         nil nil nil nil nil nil nil nil nil nil
 182         nil nil nil nil nil nil nil nil nil nil
 183         nil nil nil "=2" "A+" "B+" "G+" "D+" "H+" "W+"
 184         "Z+" "X+" "Tj" "J+" "K%" "K+" "L+" "M%" "M+" "N%"
 185         "N+" "S+" "E+" "P%" "P+" "Zj" "ZJ" "Q+" "R+" "Sh"
 186         "T+" nil nil nil nil nil]
 187      )
 188     (latin-iso8859-9
 189      . [255 "!I" "|c" "Pd" "$$" "Ye" "|" "SE" "\"" "(c)"
 190         "_a" "<<" "~" "--" "(R)" "'-" "^o" "+-" "^2" "^3"
 191         "'" "u" ".P" "^." "'," "^1" "_o" ">>" "1/4" "1/2"
 192         "3/4" "?I" "`A" "A'" "A^" "~A" "\"A" "Ao" "AE" ",C"
 193         "`E" "E'" "E^" "\"E" "`I" "I'" "I^" "\"I" "G(" "~N"
 194         "`O" "O'" "O^" "~O" "\"O" "*x" "/O" "`U" "U'" "U^"
 195         "\"U" "I^." ",S" "ss" "`a" "a'" "a^" "~a" "\"a" "ao"
 196         "ae" ",c" "`e" "e'" "e^" "\"e" "e^." "i'" "i^" "i-"
 197         "g(" "~n" "`o" "o'" "o^" "~o" "\"o" "-:" "/o" "`u"
 198         "u'" "u^" "\"u" "i^." ",s" "\"y"]
 199      )
 200     )
 201   "An alist of MULE ISO-8859 character sets and the strings that
 202 should be used to represent the characters from each set on a DOS
 203 terminal which does not have corresponding glyphs built into the
 204 installed codepage.")
 205
 206 (defun IT-display-table-setup (codepage &optional table)
 207   "Set up display table TABLE for a DOS terminal which supports
 208 glyphs built into the codepage CODEPAGE.
 209
 210 If TABLE is nil or omitted, `standard-display-table' is used."
 211   (let* ((surrogates IT-character-translations)
 212          (disp-tab (or table standard-display-table))
 213          (built-in-set (cp-charset-for-codepage codepage))
 214          (offset (cp-offset-for-codepage codepage))
 215          (cp-decoder
 216           (symbol-value (intern-soft (format "%s-decode-table" codepage))))
 217          (cp-decoder-len (length cp-decoder))
 218          (c offset)
 219          association chset)
 220     ;; Undo the effects of previous call (where they may have used
 221     ;; a different codepage) by reverting the display table for the
 222     ;; built-in charset to its pristine shape.
 223     (while (< c 256)
 224       (aset disp-tab (make-char built-in-set c) nil)
 225       (setq c (1+ c)))
 226     (while surrogates
 227       (setq association (car surrogates))
 228       (setq chset (car association))
 229       (let* ((vector (cdr association))
 230              (veclen (length vector))
 231              (i 0)
 232              glyph)
 233         (while (< i veclen)
 234           (setq glyph (aref vector i))
 235           (if (and glyph
 236                    (or (not (equal chset built-in-set))
 237                        (>= i cp-decoder-len)
 238                        (null (aref cp-decoder i))))
 239               (aset disp-tab (make-char chset (+ i (logand offset 127)))
 240                     (vconcat
 241                      (if (numberp glyph)
 242                          (char-to-string glyph)
 243                        (if (> (length glyph) 1) (concat "{" glyph "}")
 244                          glyph)))))
 245           (setq i (1+ i))))
 246       (setq surrogates (cdr surrogates)))))
 247
 248 (defun dos-cpNNN-setup (codepage)
 249   "Set up the MULE environment using the DOS codepage CODEPAGE.
 250
 251 This function creates the coding system cpNNN (where NNN is the value
 252 of the argument CODEPAGE), and then uses this coding system to set up
 253 display tables, and the language environment options as appropriate."
 254   (let* ((cp (format "cp%s" codepage))
 255          (charset (cp-charset-for-codepage cp))
 256          (offset (cp-offset-for-codepage cp)))
 257     (cp-make-coding-systems-for-codepage cp charset offset)
 258     ;; This is done by set-language-environment.
 259     ;;(setq nonascii-translation-table
 260     ;;     (symbol-value (intern (concat cp "-nonascii-translation-table"))))
 261     (set-language-environment (cp-language-for-codepage cp))
 262     (set-default-coding-systems (intern (concat cp "-dos")))
 263     (set-selection-coding-system (intern (concat cp "-dos")))
 264     (set-terminal-coding-system
 265      (setq default-terminal-coding-system (intern (concat cp
 266                                                           "-unix"))))
 267     (IT-display-table-setup cp)
 268     (prefer-coding-system (intern (concat cp "-dos")))
 269     (if default-enable-multibyte-characters
 270         ;; We want this in multibyte version only, since unibyte version
 271         ;; should not convert non-ASCII characters at all.
 272         (setq unibyte-display-via-language-environment t)
 273       ;; Let the unibyte version behave as Emacs 19 did.  In particular,
 274       ;; let it use and display native codepage-specific glyphs for
 275       ;; non-ASCII characters.  For this to work correctly, we need to
 276       ;; establish the correspondence between lower-case letters and their
 277       ;; upper-case brethren, as appropriate for the codepage in use.  The
 278       ;; code below makes this happen.
 279       ;; (In the multibyte mode, the appropriate tables are prepared
 280       ;; elsewhere, since multibyte Emacs uses normal MULE character sets,
 281       ;; which are supported on all platforms.)
 282       (let* ((i 128)
 283              (modify (function
 284                       (lambda (ch sy)
 285                         (modify-syntax-entry ch sy text-mode-syntax-table)
 286                         (if (boundp 'tex-mode-syntax-table)
 287                             (modify-syntax-entry ch sy tex-mode-syntax-table))
 288                         (modify-syntax-entry ch sy (standard-syntax-table))
 289                         )))
 290              (table (standard-case-table))
 291              ;; The following are strings of letters, first lower then
 292              ;; upper case.  This will look funny on terminals which
 293              ;; display other code pages.  In particular, what is
 294              ;; displayed as blanks or triangles are not what they
 295              ;; look lile at all!  (Use `C-x =' to see what they
 296              ;; really are.)
 297              (chars
 298               (cond
 299                ((= codepage 850)
 300                 "\87\80\81\9a\82\90\83¶\84\8e\85·\86\8fÆÇ µ\88Ò\89Ó\8aÔ\8bØ\8c×\8dÞ¡Ö\91\92\93â\94\99\95ã¢à\9b\9d\96ê£é\97ë\98Yìí¡I£é¤¥ÐÑçè")
 301                ((= codepage 865)
 302                 "\87\80\81\9a\82\90\83A\84\8e\85A\86\8f\88E\89E\8aE\8bI\8cI\8dI\91\92\93O\94\99\95O\96U£U\98Y\9b\9d A¡I¢O£U¤¥")
 303                ;; default is 437
 304                (t "\87\80\81\9a\82\90\83A\84\8e\85A\86\8f\88E\89E\8aE\8bI\8cI\8dI\91\92\93O\94\99\95O\96U£U\98Y A¡I¢O£U¤¥"))))
 305
 306         (while (< i 256)
 307           (funcall modify i "_")
 308           (setq i (1+ i)))
 309
 310         (setq i 0)
 311         (while (< i (length chars))
 312           (let ((ch1 (aref chars i))
 313                 (ch2 (aref chars (1+ i))))
 314             (if (> ch2 127)
 315                 (set-case-syntax-pair ch2 ch1 table))
 316             (setq i (+ i 2))))
 317         (save-excursion
 318           (mapcar (lambda (b) (set-buffer b) (set-case-table table))
 319                   (buffer-list)))
 320         (set-standard-case-table table)))
 321     ;; Some codepages have sporadic support for Latin-1, Greek, and
 322     ;; symbol glyphs, which don't belong to their native character
 323     ;; set.  It's a nuisance to have all those glyphs here, for all
 324     ;; the codepages (for starters, I don't even have references for
 325     ;; all the codepages).  So I provide a hook for those who want to
 326     ;; squeeze every bit of support out of their terminal/font.
 327     (run-hooks 'dos-codepage-setup-hook)
 328     ))
 329
 330 ;; FIXME: Korean and Chinese codepages should be added here, but I
 331 ;; don't know what coding systems do they support.  The codepages in
 332 ;; point are 934, 936, 938, 944, and 948.
 333 (defvar cjk-codepages-alist
 334   '((932 "Japanese" japanese-shift-jis))
 335   "An alist of Far-Eastern codepages and the names of the associated
 336 language and supported coding system.")
 337
 338 (defun dos-codepage-setup ()
 339   "Set up the MULE environment as appropriate for the installed DOS codepage.
 340
 341 This function sets coding systems, display tables, and the language
 342 environment options as appropriate for the current value of `dos-codepage'.
 343
 344 This function is automatically run at startup via the `term-setup-hook'
 345 list.  You can (and should) also run it whenever the value of
 346 `dos-codepage' changes."
 347   (interactive)
 348   (let* ((desc (cdr (assq dos-codepage cjk-codepages-alist)))
 349          (lang (car desc))
 350          (coding (car (cdr desc)))
 351          coding-dos coding-unix)
 352     (if (null desc)
 353         (dos-cpNNN-setup dos-codepage)
 354       ;; We've got one of the Far-Eastern codepages which support
 355       ;; MULE native coding systems directly.
 356       (setq coding-dos (intern (format "%s-dos" coding))
 357             coding-unix (intern (format "%s-unix" coding)))
 358       (set-language-environment (car desc))
 359       (set-selection-coding-system coding-dos)
 360       (setq file-name-coding-system coding-unix)
 361       (set-terminal-coding-system
 362        (setq default-terminal-coding-system coding-unix))
 363       ;; Assume they support non-ASCII Latin characters like the IBM
 364       ;; codepage 437 does.
 365       (IT-display-table-setup "cp437")
 366       (prefer-coding-system coding-dos)
 367       (if default-enable-multibyte-characters
 368           (setq unibyte-display-via-language-environment t))
 369       )))
 370
 371 ;; We want to delay the terminal and other codepage-related setup
 372 ;; until after the terminal is set and user's .emacs is processed,
 373 ;; because people might define their `dos-codepage-setup-hook' there.
 374 (add-hook 'term-setup-hook 'dos-codepage-setup)
 375
 376 ;; In multibyte mode, we want unibyte buffers to be displayed using
 377 ;; the terminal coding system, so that they display correctly on the
 378 ;; DOS terminal; in unibyte mode we want to see all 8-bit characters
 379 ;; verbatim.  In both cases, we want the entire range of 8-bit
 380 ;; characters to arrive at our display code verbatim.
 381 (standard-display-8bit 127 255)
 382
 383 ;;; internal.el ends here
 384