;;; internal.el --- support for PC internal terminal -*- coding: raw-text; -*-
-;; Copyright (C) 1993, 1994 Free Software Foundation, Inc.
+;; Copyright (C) 1993, 1994, 1998 Free Software Foundation, Inc.
;; Author: Morten Welinder <terra@diku.dk>
;;; Code:
-;; ---------------------------------------------------------------------------
-;; screen setup -- that's easy!
-(standard-display-8bit 127 254)
;; ---------------------------------------------------------------------------
;; keyboard setup -- that's simple!
(set-input-mode nil nil 0)
(put 'clear 'ascii-character 12)
(put 'return 'ascii-character 13)
(put 'escape 'ascii-character ?\e)
-;; ---------------------------------------------------------------------------
+
+;; ----------------------------------------------------------------------
+;; DOS display setup
+;; =================
+;;
+;; DOS can only support a single font. On most systems (with the
+;; possible exception of Far Eastern DOS versions), this means that
+;; two character sets are available at any given time: the ASCII
+;; charset, and a single national charset, usually mapped to codes
+;; above 128 (i.e., with 8th bit set). Which national charset is
+;; supported depends on the codepage loaded by the system when it
+;; boots; usually, this codepage cannot be changed without
+;; rebooting.
+;;
+;; Since each codepage can usually display character of a single
+;; MULE charset, Emacs can display a single MULE charset with the
+;; glyphs of the current codepage. The mapping from DOS codepages
+;; to MULE charsets is established by the charset property of the
+;; cpNNN-decode-table variables in codepage.el, which also
+;; defines translation tables for each such pair, and a bunch of
+;; functions to generate coding systems that use those translation
+;; tables to convert codepage-encoded text to the appropriate MULE
+;; charset and back. When Emacs starts on DOS, it automatically
+;; sets its default coding systems for file I/O and terminal output
+;; according to the currend DOS codepage, given by the
+;; `dos-codepage' variable.
+;;
+;; This leaves us with the problem of displaying character sets
+;; other than the one which maps directly into the current codepage.
+;; The following functions and variables handle this nuisance by
+;; defining a display table where each character that doesn't have a
+;; glyph in some codepage is mapped to a string which represents it.
+;; For example, a small c with cedilla is mapped to the string
+;; "{,c}" (the braces serve as a sign that this is a single
+;; character). A nice feature of the display tables is that Emacs
+;; knows that the string represents a single character, and thus
+;; cursor motion works as you'd expect: a single `C-f' moves past
+;; the entire string which represents a single character.
+;; ----------------------------------------------------------------------
+
+(defvar IT-character-translations
+ '(
+ (latin-iso8859-1
+ . [255 "!I" "|c" "Pd" "$$" "Ye" "|" "SE" "\"" "(c)"
+ "_a" "<<" "~" "--" "(R)" "'-" "^o" "+-" "^2" "^3"
+ "'" "u" ".P" "^." "'," "^1" "_o" ">>" "1/4" "1/2"
+ "3/4" "?I" "`A" "A'" "A^" "~A" "\"A" "Ao" "AE" ",C"
+ "`E" "E'" "E^" "\"E" "`I" "I'" "I^" "\"I" "D-" "~N"
+ "`O" "O'" "O^" "~O" "\"O" "*x" "/O" "`U" "U'" "U^"
+ "\"U" "Y'" "TH" "ss" "`a" "a'" "a^" "~a" "\"a" "ao"
+ "ae" ",c" "`e" "e'" "e^" "\"e" "`i" "i'" "i^" "\"i"
+ "d-" "~n" "`o" "o'" "o^" "~o" "\"o" "-:" "/o" "`u"
+ "u'" "u^" "\"u" "y'" "th" "\"y"]
+ )
+ (latin-iso8859-2
+ . [255 "A;" "'(" "/L" "$$" "L<" "S'" "SE" "\"" "S<"
+ ",S" "T<" "Z'" "--" "Z<" "Z^." "^o" "a;" "';" "/l"
+ "'" "l<" "s'" "'<" "'," "s<" ",s" "t<" "z'" "'"
+ "z<" "z^." "R'" "A'" "A^" "A(" "\"A" "L'" "C'" ",C"
+ "C<" "E'" "E;" "E:" "E<" "I'" "I^" "D<" "/D" "N'"
+ "N<" "O'" "O^" "O''" "\"O" "*x" "R<" "U^0" "U'" "U''"
+ "\"U" "Y'" ",T" "ss" "r'" "a'" "a^" "a(" "\"a" "l'"
+ "c'" ",c" "c<" "e'" "e;" "\"e" "e<" "i'" "i^" "d<"
+ "/d" "n'" "n<" "o'" "o^" "o''" "\"o" "-:" "r<" "u^0"
+ "u'" "u''" "\"u" "y'" ",t" "'."]
+ )
+ (latin-iso8859-3
+ . [255 "/H" "'(" "Pd" "$$" " " "H^" "SE" "\"" "I^."
+ ",S" "G(" "J^" "--" " " "Z^." "^o" "/h" "^2" "^3"
+ "'" "u" "h^" "." "'," "i^." ",s" "g(" "j^" "1/2"
+ " " "z^." "`A" "A'" "A^" " " "\"A" "C^." "C^" ",C"
+ "`E" "E'" "E^" "\"E" "`I" "I'" "I^" "\"I" " " "~N"
+ "`O" "O'" "O^" "G^." "\"O" "*x" "G^" "`U" "U'" "U^"
+ "\"U" "U(" "S^" "ss" "`a" "a'" "a^" " " "\"a" "c^."
+ "c^" ",c" "`e" "e'" "e^" "\"e" "`i" "i'" "i^" "\"i"
+ " " "~n" "`o" "o'" "o^" "g^." "\"o" "-:" "g^" "`u"
+ "u'" "u^" "\"u" "u(" "s^" "^."]
+ )
+ (latin-iso8859-4
+ . [255 "A;" "kk" ",R" "$$" "?I" ",L" "SE" "\"" "S<"
+ "E-" ",G" "/T" "--" "Z<" "'-" "^o" "a;" "';" ",r"
+ "'" "~i" ",l" "'<" "'," "s<" "e-" ",g" "/t" "NG"
+ "z<" "ng" "A-" "A'" "A^" "~A" "\"A" "Ao" "AE" "I;"
+ "C<" "E'" "E;" "\"E" "E^." "I'" "I^" "I-" "/D" ",N"
+ "O-" ",K" "O^" "~O" "\"O" "*x" "/O" "U;" "U'" "U^"
+ "\"U" "~U" "U-" "ss" "a-" "a'" "a^" "~a" "\"a" "ao"
+ "ae" "i;" "c<" "e'" "e;" "\"e" "e^." "i'" "i^" "i-"
+ "/d" ",n" "o-" ",k" "o^" "~o" "\"o" "-:" "/o" "u;"
+ "u'" "u^" "\"u" "~u" "u-" "^."]
+ )
+ (cyrillic-iso8859-5
+ . [255 "\"E" "Dj" "Gj" "IE" "Dz" "Ii" "Ji" "JE" "Lj"
+ "Nj" "Ts" "Kj" 240 "V%" "Dzh" 65 "B=" 66 226
+ 68 69 "Z%" 51 85 "J=" 75 "L=" 77 72
+ 79 "P=" 80 67 84 89 232 88 "C=" "C%"
+ "S%" "Sc" "=\"" "Y=" "%\"" "Ee" "Yu" "Ya" 97 98
+ "v=" "g=" 103 101 "z%" "z=" 117 "j=" 107 "l="
+ "m=" "n=" 111 110 112 99 "t=" 121 "f=" 120
+ "c=" "c%" "s%" "sc" "='" "y=" "%'" "ee" "yu" "ya"
+ "N0" "\"e" "dj" "gj" "ie" "dz" "ii" "ji" "je" "lj"
+ "nj" "ts" "kj" 21 "v%" "dzh"]
+ )
+ (arabic-iso8859-6
+ . [255 nil nil nil "$$" nil nil nil nil nil
+ nil nil ",+" "--" nil nil nil nil nil nil
+ nil nil nil nil nil nil nil ";+" nil nil
+ nil "?+" nil "H'" "aM" "aH" "wH" "ah" "yH"
+ "a+" "b+" "tm" "t+" "tk" "g+" "hk" "x+" "d+" "dk"
+ "r+" "z+" "s+" "sn" "c+" "dd" "tj" "zH" "e+" "i+"
+ nil nil nil nil nil "++" "f+" "q+" "k+" "l+"
+ "m+" "n+" "h+" "w+" "j+" "y+" ":+" "\"+" "=+" "/+"
+ "'+" "1+" "3+" "0+" nil nil nil nil nil nil
+ nil nil nil nil nil nil nil]
+ )
+ (greek-iso8859-7
+ . [255 "9'" "'9" "Pd" nil nil "|" "SE" "\"" "(c)"
+ nil "<<" "~" "--" nil "-M" "^o" "+-" "^2" "^3"
+ "'" "'%" "A%" "^." "E%" "Y%" "I%" ">>" "O%" "1/2"
+ "U%" "W%" "i3" "A*" "B*" "G*" "D*" "E*" "Z*" "Y*"
+ "H*" "I*" "K*" "L*" "M*" "N*" "C*" "O*" "P*" "R*"
+ nil "S*" "T*" "U*" "F*" "X*" "Q*" "W*" "J*" "V*"
+ "a%" "e%" "y%" "i%" "u3" "a*" "b*" "g*" "d*" "e*"
+ "z*" "y*" "h*" "i*" "k*" "l*" "m*" "n*" "c*" "o*"
+ "p*" "r*" "*s" "s*" "t*" "u*" "f*" "x*" "q*" "w*"
+ "j*" "v*" "o%" "u%" "w%" nil]
+ )
+ (hebrew-iso8859-8
+ . [255 nil "|c" "Pd" "$$" "Ye" "|" "SE" "\"" "(c)"
+ "*x" "<<" "~" "--" "(R)" "'-" "^o" "+-" "^2" "^3"
+ "'" "u" ".P" "^." "'," "^1" "-:" ">>" "1/4" "1/2"
+ "3/4" nil nil nil nil nil nil nil nil nil
+ nil nil nil nil nil nil nil nil nil nil
+ nil nil nil nil nil nil nil nil nil nil
+ nil nil nil "=2" "A+" "B+" "G+" "D+" "H+" "W+"
+ "Z+" "X+" "Tj" "J+" "K%" "K+" "L+" "M%" "M+" "N%"
+ "N+" "S+" "E+" "P%" "P+" "Zj" "ZJ" "Q+" "R+" "Sh"
+ "T+" nil nil nil nil nil]
+ )
+ (latin-iso8859-9
+ . [255 "!I" "|c" "Pd" "$$" "Ye" "|" "SE" "\"" "(c)"
+ "_a" "<<" "~" "--" "(R)" "'-" "^o" "+-" "^2" "^3"
+ "'" "u" ".P" "^." "'," "^1" "_o" ">>" "1/4" "1/2"
+ "3/4" "?I" "`A" "A'" "A^" "~A" "\"A" "Ao" "AE" ",C"
+ "`E" "E'" "E^" "\"E" "`I" "I'" "I^" "\"I" "G(" "~N"
+ "`O" "O'" "O^" "~O" "\"O" "*x" "/O" "`U" "U'" "U^"
+ "\"U" "I^." ",S" "ss" "`a" "a'" "a^" "~a" "\"a" "ao"
+ "ae" ",c" "`e" "e'" "e^" "\"e" "e^." "i'" "i^" "i-"
+ "g(" "~n" "`o" "o'" "o^" "~o" "\"o" "-:" "/o" "`u"
+ "u'" "u^" "\"u" "i^." ",s" "\"y"]
+ )
+ )
+ "An alist of MULE ISO-8859 character sets and the strings that
+should be used to represent the characters from each set on a DOS
+terminal which does not have corresponding glyphs built into the
+installed codepage.")
+
+(defun IT-display-table-setup (codepage &optional table)
+ "Set up display table TABLE for a DOS terminal which supports a
+glyphs built into the current codepage CODEPAGE.
+
+If TABLE is nil or omitted, `standard-display-table' is used."
+ (let* ((surrogates IT-character-translations)
+ (disp-tab (or table standard-display-table))
+ (built-in-set (cp-charset-for-codepage codepage))
+ (offset (cp-offset-for-codepage codepage))
+ (cp-decoder
+ (symbol-value (intern-soft (format "%s-decode-table" codepage))))
+ (cp-decoder-len (length cp-decoder))
+ (c offset)
+ association chset)
+ ;; Undo the effects of previous call (where they may have used
+ ;; a different codepage) by reverting the display table for the
+ ;; built-in charset to its pristine shape.
+ (while (< c (+ offset 128))
+ (aset disp-tab (make-char built-in-set c) nil)
+ (setq c (1+ c)))
+ (while surrogates
+ (setq association (car surrogates))
+ (setq chset (car association))
+ (let* ((vector (cdr association))
+ (veclen (length vector))
+ (i 0)
+ glyph)
+ (while (< i veclen)
+ (setq glyph (aref vector i))
+ (if (and glyph
+ (or (not (equal chset built-in-set))
+ (>= i cp-decoder-len)
+ (null (aref cp-decoder i))))
+ (aset disp-tab (make-char chset (+ i (logand offset 127)))
+ (vconcat
+ (if (numberp glyph)
+ (char-to-string glyph)
+ (if (> (length glyph) 1) (concat "{" glyph "}")
+ glyph)))))
+ (setq i (1+ i))))
+ (setq surrogates (cdr surrogates)))
+ ;; Most Windows programs send out apostrophe's as \222. Most DOS
+ ;; fonts contain a different character at that position. Map it
+ ;; to the ASCII apostrophe.
+ (aset standard-display-table 146 [39])))
+
+(defun dos-codepage-setup ()
+ "Set up the MULE environment as appropriate for the installed DOS codepage.
+
+This function sets coding systems, display tables, and the language
+environment options as appropriate for the current value of `dos-codepage'.
+
+This function is automatically run at startup via the `term-setup-hook'
+list. You can (and should) also run it whenever the value of
+`dos-codepage' changes."
+ (interactive)
+ (let* ((cp (format "cp%s" dos-codepage))
+ (charset (cp-charset-for-codepage cp))
+ (offset (cp-offset-for-codepage cp)))
+ (cp-make-coding-systems-for-codepage cp charset offset)
+ ;; This is done by set-language-environment.
+ ;;(setq nonascii-translation-table
+ ;; (symbol-value (intern (concat cp "-nonascii-translation-table"))))
+ (set-language-environment (cp-language-for-codepage cp))
+ (set-default-coding-systems (intern (concat cp "-dos")))
+ (set-terminal-coding-system
+ (setq default-terminal-coding-system (intern (concat cp
+ "-unix"))))
+ (IT-display-table-setup cp)
+ ;; Some codepages have sporadic support for Latin-1, Greek, and
+ ;; symbol glyphs, which don't belong to their native character
+ ;; set. It's a nuisance to have all those glyphs here, for all
+ ;; the codepages (for starters, I don't even have references for
+ ;; all the codepages). So I provide a hook for those who want to
+ ;; squeeze every bit of support out of their terminal/font.
+ (run-hooks 'dos-codepage-setup-hook)
+ ))
+
+;; We want to delay the terminal and other codepage-related setup
+;; until after the terminal is set and user's .emacs is processed,
+;; because people might define their `dos-codepage-setup-hook' there.
+(add-hook 'term-setup-hook 'dos-codepage-setup)
+
+;; In multibyte mode, we want unibyte buffers to be displayed using
+;; the terminal coding system, so that they display correctly on the
+;; DOS terminal; in unibyte mode we want to see all 8-bit characters
+;; verbatim. In both cases, we want the entire range of 8-bit
+;; characters to arrive at our display code verbatim.
+(standard-display-8bit 127 254)
+
+(if default-enable-multibyte-characters
+ ;; We want this in multibyte version only, since unibyte version
+ ;; should not convert non-ASCII characters at all.
+ (setq unibyte-display-via-language-environment t)
+ ;; Let the unibyte version behave as Emacs 19 did. In particular,
+ ;; let it use and display native codepage-specific glyphs for
+ ;; non-ASCII characters. For this to work correctly, we need to
+ ;; establish the correspondence between lower-case letters and their
+ ;; upper-case brethren, as appropriate for the codepage in use. The
+ ;; code below makes this happen.
+ ;; (In the multibyte mode, the appropriate tables are prepared
+ ;; elsewhere, since multibyte Emacs uses normal MULE character sets,
+ ;; which are supported on all platforms.)
+ (let* ((i 128)
+ (modify (function
+ (lambda (ch sy)
+ (modify-syntax-entry ch sy text-mode-syntax-table)
+ (if (boundp 'tex-mode-syntax-table)
+ (modify-syntax-entry ch sy tex-mode-syntax-table))
+ (modify-syntax-entry ch sy (standard-syntax-table))
+ )))
+ (table (standard-case-table))
+ ;; The following are strings of letters, first lower then upper case.
+ ;; This will look funny on terminals which display other code pages.
+ ;; In particular, what is displayed as blanks are not blanks
+ ;; at all! (Use `C-x =' to see what they really are.)
+ (chars
+ (cond
+ ((= dos-codepage 850)
+ "\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")
+ ((= dos-codepage 865)
+ "\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¤¥")
+ ;; default is 437
+ (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¤¥"))))
+
+ (while (< i 256)
+ (funcall modify i "_")
+ (setq i (1+ i)))
+
+ (setq i 0)
+ (while (< i (length chars))
+ (let ((ch1 (aref chars i))
+ (ch2 (aref chars (1+ i))))
+ (if (> ch2 127)
+ (set-case-syntax-pair ch2 ch1 table))
+ (setq i (+ i 2))))
+ (save-excursion
+ (mapcar (lambda (b) (set-buffer b) (set-case-table table))
+ (buffer-list)))
+ (set-standard-case-table table)))
;;; internal.el ends here
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