lisp/descr-text.el

   1 ;;; descr-text.el --- describe text mode
   2
   3 ;; Copyright (C) 1994, 1995, 1996, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; Author: Boris Goldowsky <boris@gnu.org>
   7 ;; Maintainer: FSF
   8 ;; Keywords: faces, i18n, Unicode, multilingual
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;;; Describe-Text Mode.
  30
  31 ;;; Code:
  32
  33 (eval-when-compile (require 'quail))
  34 (require 'help-fns)
  35
  36 ;;; Describe-Text Utilities.
  37
  38 (defun describe-text-widget (widget)
  39   "Insert text to describe WIDGET in the current buffer."
  40   (insert-text-button
  41    (symbol-name (if (symbolp widget) widget (car widget)))
  42    'action `(lambda (&rest ignore)
  43               (widget-browse ',widget))
  44    'help-echo "mouse-2, RET: browse this widget")
  45   (insert " ")
  46   (insert-text-button
  47    "(widget)Top" 'type 'help-info 'help-args '("(widget)Top")))
  48
  49 (defun describe-text-sexp (sexp)
  50   "Insert a short description of SEXP in the current buffer."
  51   (let ((pp (condition-case signal
  52                 (pp-to-string sexp)
  53               (error (prin1-to-string signal)))))
  54     (when (string-match "\n\\'" pp)
  55       (setq pp (substring pp 0 (1- (length pp)))))
  56     (if (cond ((string-match "\n" pp)
  57                nil)
  58               ((> (length pp) (- (window-width) (current-column)))
  59                nil)
  60               (t t))
  61         (insert pp)
  62       (insert-text-button
  63        "[Show]" 'action `(lambda (&rest ignore)
  64                         (with-output-to-temp-buffer
  65                             "*Pp Eval Output*"
  66                           (princ ',pp)))
  67        'help-echo "mouse-2, RET: pretty print value in another buffer"))))
  68
  69 (defun describe-property-list (properties)
  70   "Insert a description of PROPERTIES in the current buffer.
  71 PROPERTIES should be a list of overlay or text properties.
  72 The `category', `face' and `font-lock-face' properties are made
  73 into help buttons that call `describe-text-category' or
  74 `describe-face' when pushed."
  75   ;; Sort the properties by the size of their value.
  76   (dolist (elt (sort (let (ret)
  77                        (while properties
  78                          (push (list (pop properties) (pop properties)) ret))
  79                        ret)
  80                      (lambda (a b) (string< (prin1-to-string (nth 0 a) t)
  81                                             (prin1-to-string (nth 0 b) t)))))
  82     (let ((key (nth 0 elt))
  83           (value (nth 1 elt)))
  84       (insert (propertize (format "  %-20s " key)
  85                           'face 'help-argument-name))
  86       (cond ((eq key 'category)
  87              (insert-text-button
  88               (symbol-name value)
  89               'action `(lambda (&rest ignore)
  90                          (describe-text-category ',value))
  91               'help-echo "mouse-2, RET: describe this category"))
  92             ((memq key '(face font-lock-face mouse-face))
  93              (insert-text-button
  94               (format "%S" value)
  95               'type 'help-face 'help-args (list value)))
  96             ((widgetp value)
  97              (describe-text-widget value))
  98             (t
  99              (describe-text-sexp value))))
 100     (insert "\n")))
 101 \f
 102 ;;; Describe-Text Commands.
 103
 104 (defun describe-text-category (category)
 105   "Describe a text property category."
 106   (interactive "SCategory: ")
 107   (help-setup-xref (list #'describe-text-category category) (interactive-p))
 108   (save-excursion
 109     (with-output-to-temp-buffer "*Help*"
 110       (set-buffer standard-output)
 111       (insert "Category " (format "%S" category) ":\n\n")
 112       (describe-property-list (symbol-plist category))
 113       (goto-char (point-min)))))
 114
 115 ;;;###autoload
 116 (defun describe-text-properties (pos &optional output-buffer)
 117   "Describe widgets, buttons, overlays and text properties at POS.
 118 Interactively, describe them for the character after point.
 119 If optional second argument OUTPUT-BUFFER is non-nil,
 120 insert the output into that buffer, and don't initialize or clear it
 121 otherwise."
 122   (interactive "d")
 123   (if (>= pos (point-max))
 124       (error "No character follows specified position"))
 125   (if output-buffer
 126       (describe-text-properties-1 pos output-buffer)
 127     (if (not (or (text-properties-at pos) (overlays-at pos)))
 128         (message "This is plain text.")
 129       (let ((buffer (current-buffer))
 130             (target-buffer "*Help*"))
 131         (when (eq buffer (get-buffer target-buffer))
 132           (setq target-buffer "*Help*<2>"))
 133         (save-excursion
 134           (with-output-to-temp-buffer target-buffer
 135             (set-buffer standard-output)
 136             (setq output-buffer (current-buffer))
 137             (insert "Text content at position " (format "%d" pos) ":\n\n")
 138             (with-current-buffer buffer
 139               (describe-text-properties-1 pos output-buffer))
 140             (goto-char (point-min))))))))
 141
 142 (defun describe-text-properties-1 (pos output-buffer)
 143   (let* ((properties (text-properties-at pos))
 144          (overlays (overlays-at pos))
 145          (wid-field (get-char-property pos 'field))
 146          (wid-button (get-char-property pos 'button))
 147          (wid-doc (get-char-property pos 'widget-doc))
 148          ;; If button.el is not loaded, we have no buttons in the text.
 149          (button (and (fboundp 'button-at) (button-at pos)))
 150          (button-type (and button (button-type button)))
 151          (button-label (and button (button-label button)))
 152          (widget (or wid-field wid-button wid-doc)))
 153     (with-current-buffer output-buffer
 154       ;; Widgets
 155       (when (widgetp widget)
 156         (newline)
 157         (insert (cond (wid-field "This is an editable text area")
 158                       (wid-button "This is an active area")
 159                       (wid-doc "This is documentation text")))
 160         (insert " of a ")
 161         (describe-text-widget widget)
 162         (insert ".\n\n"))
 163       ;; Buttons
 164       (when (and button (not (widgetp wid-button)))
 165         (newline)
 166         (insert "Here is a `" (format "%S" button-type)
 167                 "' button labeled `" button-label "'.\n\n"))
 168       ;; Overlays
 169       (when overlays
 170         (newline)
 171         (if (eq (length overlays) 1)
 172             (insert "There is an overlay here:\n")
 173           (insert "There are " (format "%d" (length overlays))
 174                          " overlays here:\n"))
 175         (dolist (overlay overlays)
 176           (insert " From " (format "%d" (overlay-start overlay))
 177                          " to " (format "%d" (overlay-end overlay)) "\n")
 178           (describe-property-list (overlay-properties overlay)))
 179         (insert "\n"))
 180       ;; Text properties
 181       (when properties
 182         (newline)
 183         (insert "There are text properties here:\n")
 184         (describe-property-list properties)))))
 185 \f
 186 (defcustom describe-char-unicodedata-file nil
 187   "Location of Unicode data file.
 188 This is the UnicodeData.txt file from the Unicode Consortium, used for
 189 diagnostics.  If it is non-nil `describe-char' will print data
 190 looked up from it.  This facility is mostly of use to people doing
 191 multilingual development.
 192
 193 This is a fairly large file, not typically present on GNU systems.
 194 At the time of writing it is at the URL
 195 `http://www.unicode.org/Public/UNIDATA/UnicodeData.txt'."
 196   :group 'mule
 197   :version "22.1"
 198   :type '(choice (const :tag "None" nil)
 199                  file))
 200
 201 ;; We could convert the unidata file into a Lispy form once-for-all
 202 ;; and distribute it for loading on demand.  It might be made more
 203 ;; space-efficient by splitting strings word-wise and replacing them
 204 ;; with lists of symbols interned in a private obarray, e.g.
 205 ;; "LATIN SMALL LETTER A" => '(LATIN SMALL LETTER A).
 206
 207 ;; Fixme: Check whether this needs updating for Unicode 4.
 208 (defun describe-char-unicode-data (char)
 209   "Return a list of Unicode data for unicode CHAR.
 210 Each element is a list of a property description and the property value.
 211 The list is null if CHAR isn't found in `describe-char-unicodedata-file'."
 212   (when describe-char-unicodedata-file
 213     (unless (file-exists-p describe-char-unicodedata-file)
 214       (error "`unicodedata-file' %s not found" describe-char-unicodedata-file))
 215     (with-current-buffer (get-buffer-create " *Unicode Data*")
 216       (when (zerop (buffer-size))
 217         ;; Don't use -literally in case of DOS line endings.
 218         (insert-file-contents describe-char-unicodedata-file))
 219       (goto-char (point-min))
 220       (let ((hex (format "%04X" char))
 221             found first last)
 222         (if (re-search-forward (concat "^" hex) nil t)
 223             (setq found t)
 224           ;; It's not listed explicitly.  Look for ranges, e.g. CJK
 225           ;; ideographs, and check whether it's in one of them.
 226           (while (and (re-search-forward "^\\([^;]+\\);[^;]+First>;" nil t)
 227                       (>= char (setq first
 228                                      (string-to-number (match-string 1) 16)))
 229                       (progn
 230                         (forward-line 1)
 231                         (looking-at "^\\([^;]+\\);[^;]+Last>;")
 232                         (> char
 233                            (setq last
 234                                  (string-to-number (match-string 1) 16))))))
 235           (if (and (>= char first)
 236                    (<= char last))
 237               (setq found t)))
 238         (if found
 239             (let ((fields (mapcar (lambda (elt)
 240                                     (if (> (length elt) 0)
 241                                         elt))
 242                                   (cdr (split-string
 243                                         (buffer-substring
 244                                          (line-beginning-position)
 245                                          (line-end-position))
 246                                         ";")))))
 247               ;; The length depends on whether the last field was empty.
 248               (unless (or (= 13 (length fields))
 249                           (= 14 (length fields)))
 250                 (error "Invalid contents in %s" describe-char-unicodedata-file))
 251               ;; The field names and values lists are slightly
 252               ;; modified from Mule-UCS unidata.el.
 253               (list
 254                (list "Name" (let ((name (nth 0 fields)))
 255                               ;; Check for <..., First>, <..., Last>
 256                               (if (string-match "\\`\\(<[^,]+\\)," name)
 257                                   (concat (match-string 1 name) ">")
 258                                 name)))
 259                (list "Category"
 260                      (cdr (assoc
 261                            (nth 1 fields)
 262                            '(("Lu" . "uppercase letter")
 263                              ("Ll" . "lowercase letter")
 264                              ("Lt" . "titlecase letter")
 265                              ("Mn" . "non-spacing mark")
 266                              ("Mc" . "spacing-combining mark")
 267                              ("Me" . "enclosing mark")
 268                              ("Nd" . "decimal digit")
 269                              ("Nl" . "letter number")
 270                              ("No" . "other number")
 271                              ("Zs" . "space separator")
 272                              ("Zl" . "line separator")
 273                              ("Zp" . "paragraph separator")
 274                              ("Cc" . "other control")
 275                              ("Cf" . "other format")
 276                              ("Cs" . "surrogate")
 277                              ("Co" . "private use")
 278                              ("Cn" . "not assigned")
 279                              ("Lm" . "modifier letter")
 280                              ("Lo" . "other letter")
 281                              ("Pc" . "connector punctuation")
 282                              ("Pd" . "dash punctuation")
 283                              ("Ps" . "open punctuation")
 284                              ("Pe" . "close punctuation")
 285                              ("Pi" . "initial-quotation punctuation")
 286                              ("Pf" . "final-quotation punctuation")
 287                              ("Po" . "other punctuation")
 288                              ("Sm" . "math symbol")
 289                              ("Sc" . "currency symbol")
 290                              ("Sk" . "modifier symbol")
 291                              ("So" . "other symbol")))))
 292                (list "Combining class"
 293                      (cdr (assoc
 294                            (string-to-number (nth 2 fields))
 295                            '((0 . "Spacing")
 296                              (1 . "Overlays and interior")
 297                              (7 . "Nuktas")
 298                              (8 . "Hiragana/Katakana voicing marks")
 299                              (9 . "Viramas")
 300                              (10 . "Start of fixed position classes")
 301                              (199 . "End of fixed position classes")
 302                              (200 . "Below left attached")
 303                              (202 . "Below attached")
 304                              (204 . "Below right attached")
 305                              (208 . "Left attached (reordrant around \
 306 single base character)")
 307                              (210 . "Right attached")
 308                              (212 . "Above left attached")
 309                              (214 . "Above attached")
 310                              (216 . "Above right attached")
 311                              (218 . "Below left")
 312                              (220 . "Below")
 313                              (222 . "Below right")
 314                              (224 . "Left (reordrant around single base \
 315 character)")
 316                              (226 . "Right")
 317                              (228 . "Above left")
 318                              (230 . "Above")
 319                              (232 . "Above right")
 320                              (233 . "Double below")
 321                              (234 . "Double above")
 322                              (240 . "Below (iota subscript)")))))
 323                (list "Bidi category"
 324                      (cdr (assoc
 325                            (nth 3 fields)
 326                            '(("L" . "Left-to-Right")
 327                              ("LRE" . "Left-to-Right Embedding")
 328                              ("LRO" . "Left-to-Right Override")
 329                              ("R" . "Right-to-Left")
 330                              ("AL" . "Right-to-Left Arabic")
 331                              ("RLE" . "Right-to-Left Embedding")
 332                              ("RLO" . "Right-to-Left Override")
 333                              ("PDF" . "Pop Directional Format")
 334                              ("EN" . "European Number")
 335                              ("ES" . "European Number Separator")
 336                              ("ET" . "European Number Terminator")
 337                              ("AN" . "Arabic Number")
 338                              ("CS" . "Common Number Separator")
 339                              ("NSM" . "Non-Spacing Mark")
 340                              ("BN" . "Boundary Neutral")
 341                              ("B" . "Paragraph Separator")
 342                              ("S" . "Segment Separator")
 343                              ("WS" . "Whitespace")
 344                              ("ON" . "Other Neutrals")))))
 345                (list
 346                 "Decomposition"
 347                 (if (nth 4 fields)
 348                     (let* ((parts (split-string (nth 4 fields)))
 349                            (info (car parts)))
 350                       (if (string-match "\\`<\\(.+\\)>\\'" info)
 351                           (setq info (match-string 1 info))
 352                         (setq info nil))
 353                       (if info (setq parts (cdr parts)))
 354                       ;; Maybe printing ? for unrepresentable unicodes
 355                       ;; here and below should be changed?
 356                       (setq parts (mapconcat
 357                                    (lambda (arg)
 358                                      (string (or (decode-char
 359                                                   'ucs
 360                                                   (string-to-number arg 16))
 361                                                  ??)))
 362                                    parts " "))
 363                       (concat info parts))))
 364                (list "Decimal digit value"
 365                      (nth 5 fields))
 366                (list "Digit value"
 367                      (nth 6 fields))
 368                (list "Numeric value"
 369                      (nth 7 fields))
 370                (list "Mirrored"
 371                      (if (equal "Y" (nth 8 fields))
 372                          "yes"))
 373                (list "Old name" (nth 9 fields))
 374                (list "ISO 10646 comment" (nth 10 fields))
 375                (list "Uppercase" (and (nth 11 fields)
 376                                       (string (or (decode-char
 377                                                    'ucs
 378                                                    (string-to-number
 379                                                     (nth 11 fields) 16))
 380                                                   ??))))
 381                (list "Lowercase" (and (nth 12 fields)
 382                                       (string (or (decode-char
 383                                                    'ucs
 384                                                    (string-to-number
 385                                                     (nth 12 fields) 16))
 386                                                   ??))))
 387                (list "Titlecase" (and (nth 13 fields)
 388                                       (string (or (decode-char
 389                                                    'ucs
 390                                                    (string-to-number
 391                                                     (nth 13 fields) 16))
 392                                                   ??)))))))))))
 393
 394 ;; Return information about how CHAR is displayed at the buffer
 395 ;; position POS.  If the selected frame is on a graphic display,
 396 ;; return a cons (FONTNAME . GLYPH-CODE).  Otherwise, return a string
 397 ;; describing the terminal codes for the character.
 398 (defun describe-char-display (pos char)
 399   (if (display-graphic-p (selected-frame))
 400       (internal-char-font pos char)
 401     (let* ((coding (terminal-coding-system))
 402            (encoded (encode-coding-char char coding)))
 403       (if encoded
 404           (encoded-string-description encoded coding)))))
 405
 406 \f
 407 ;;;###autoload
 408 (defun describe-char (pos)
 409   "Describe the character after POS (interactively, the character after point).
 410 The information includes character code, charset and code points in it,
 411 syntax, category, how the character is encoded in a file,
 412 character composition information (if relevant),
 413 as well as widgets, buttons, overlays, and text properties."
 414   (interactive "d")
 415   (if (>= pos (point-max))
 416       (error "No character follows specified position"))
 417   (let* ((char (char-after pos))
 418          (charset (char-charset char))
 419          (composition (find-composition pos nil nil t))
 420          (component-chars nil)
 421          (display-table (or (window-display-table)
 422                             buffer-display-table
 423                             standard-display-table))
 424          (disp-vector (and display-table (aref display-table char)))
 425          (multibyte-p enable-multibyte-characters)
 426          (overlays (mapcar #'(lambda (o) (overlay-properties o))
 427                            (overlays-at pos)))
 428          (char-description (if (not multibyte-p)
 429                                (single-key-description char)
 430                              (if (< char 128)
 431                                  (single-key-description char)
 432                                (string-to-multibyte
 433                                 (char-to-string char)))))
 434          (text-props-desc
 435           (let ((tmp-buf (generate-new-buffer " *text-props*")))
 436             (unwind-protect
 437                 (progn
 438                   (describe-text-properties pos tmp-buf)
 439                   (with-current-buffer tmp-buf (buffer-string)))
 440               (kill-buffer tmp-buf))))
 441          item-list max-width unicode)
 442
 443     (if (or (< char 256)
 444             (memq 'mule-utf-8 (find-coding-systems-region pos (1+ pos)))
 445             (get-char-property pos 'untranslated-utf-8))
 446         (setq unicode (or (get-char-property pos 'untranslated-utf-8)
 447                           (encode-char char 'ucs))))
 448     (setq item-list
 449           `(("character"
 450              ,(format "%s (%d, #o%o, #x%x%s)"
 451                       (apply 'propertize char-description
 452                              (text-properties-at pos))
 453                       char char char
 454                       (if unicode
 455                           (format ", U+%04X" unicode)
 456                         "")))
 457             ("charset"
 458              ,`(insert-text-button
 459                 ,(symbol-name charset)
 460                 'type 'help-character-set 'help-args '(,charset))
 461              ,(format "(%s)" (charset-description charset)))
 462             ("code point"
 463              ,(let ((split (split-char char)))
 464                 `(insert-text-button
 465                   ,(if (= (charset-dimension charset) 1)
 466                        (format "#x%02X" (nth 1 split))
 467                      (format "#x%02X #x%02X" (nth 1 split)
 468                              (nth 2 split)))
 469                   'action (lambda (&rest ignore)
 470                             (list-charset-chars ',charset)
 471                             (with-selected-window
 472                                 (get-buffer-window "*Character List*" 0)
 473                               (goto-char (point-min))
 474                               (forward-line 2) ;Skip the header.
 475                               (let ((case-fold-search nil))
 476                                 (search-forward ,(char-to-string char)
 477                                                 nil t))))
 478                   'help-echo
 479                   "mouse-2, RET: show this character in its character set")))
 480             ("syntax"
 481              ,(let ((syntax (syntax-after pos)))
 482                 (with-temp-buffer
 483                   (internal-describe-syntax-value syntax)
 484                   (buffer-string))))
 485             ("category"
 486              ,@(let ((category-set (char-category-set char)))
 487                  (if (not category-set)
 488                      '("-- none --")
 489                    (mapcar #'(lambda (x) (format "%c:%s"
 490                                                  x (category-docstring x)))
 491                            (category-set-mnemonics category-set)))))
 492             ,@(let ((props (aref char-code-property-table char))
 493                     ps)
 494                 (when props
 495                   (while props
 496                     (push (format "%s:" (pop props)) ps)
 497                     (push (format "%s;" (pop props)) ps))
 498                   (list (cons "Properties" (nreverse ps)))))
 499             ("to input"
 500              ,@(let ((key-list (and (eq input-method-function
 501                                         'quail-input-method)
 502                                     (quail-find-key char))))
 503                  (if (consp key-list)
 504                      (list "type"
 505                            (mapconcat #'(lambda (x) (concat "\"" x "\""))
 506                                       key-list " or ")
 507                            "with"
 508                            `(insert-text-button
 509                              ,current-input-method
 510                              'type 'help-input-method
 511                              'help-args '(,current-input-method))))))
 512             ("buffer code"
 513              ,(encoded-string-description
 514                (string-as-unibyte (char-to-string char)) nil))
 515             ("file code"
 516              ,@(let* ((coding buffer-file-coding-system)
 517                       (encoded (encode-coding-char char coding)))
 518                  (if encoded
 519                      (list (encoded-string-description encoded coding)
 520                            (format "(encoded by coding system %S)" coding))
 521                    (list "not encodable by coding system"
 522                          (symbol-name coding)))))
 523             ("display"
 524              ,(cond
 525                (disp-vector
 526                 (setq disp-vector (copy-sequence disp-vector))
 527                 (dotimes (i (length disp-vector))
 528                   (setq char (aref disp-vector i))
 529                   (aset disp-vector i
 530                         (cons char (describe-char-display
 531                                     pos (logand char #x7ffff)))))
 532                 (format "by display table entry [%s] (see below)"
 533                         (mapconcat
 534                          #'(lambda (x)
 535                              (format "?%c" (logand (car x) #x7ffff)))
 536                          disp-vector " ")))
 537                (composition
 538                 (let ((from (car composition))
 539                       (to (nth 1 composition))
 540                       (next (1+ pos))
 541                       (components (nth 2 composition))
 542                       ch)
 543                   (setcar composition
 544                           (and (< from pos) (buffer-substring from pos)))
 545                   (setcar (cdr composition)
 546                           (and (< next to) (buffer-substring next to)))
 547                   (dotimes (i (length components))
 548                     (if (integerp (setq ch (aref components i)))
 549                         (push (cons ch (describe-char-display pos ch))
 550                               component-chars)))
 551                   (setq component-chars (nreverse component-chars))
 552                   (format "composed to form \"%s\" (see below)"
 553                           (buffer-substring from to))))
 554                (t
 555                 (let ((display (describe-char-display pos char)))
 556                   (if (display-graphic-p (selected-frame))
 557                       (if display
 558                           (concat
 559                            "by this font (glyph code)\n"
 560                            (format "     %s (#x%02X)"
 561                                    (car display) (cdr display)))
 562                         "no font available")
 563                     (if display
 564                         (format "terminal code %s" display)
 565                       "not encodable for terminal"))))))
 566             ,@(let ((face
 567                      (if (not (or disp-vector composition))
 568                          (cond
 569                           ((and show-trailing-whitespace
 570                                 (save-excursion (goto-char pos)
 571                                                 (looking-at "[ \t]+$")))
 572                            'trailing-whitespace)
 573                           ((and nobreak-char-display unicode (eq unicode '#xa0))
 574                            'nobreak-space)
 575                           ((and nobreak-char-display unicode (eq unicode '#xad))
 576                            'escape-glyph)
 577                           ((and (< char 32) (not (memq char '(9 10))))
 578                            'escape-glyph)))))
 579                 (if face (list (list "hardcoded face"
 580                                      `(insert-text-button
 581                                        ,(symbol-name face)
 582                                        'type 'help-face 'help-args '(,face))))))
 583             ,@(let ((unicodedata (and unicode
 584                                       (describe-char-unicode-data unicode))))
 585                 (if unicodedata
 586                     (cons (list "Unicode data" " ") unicodedata)))))
 587     (setq max-width (apply #'max (mapcar #'(lambda (x)
 588                                              (if (cadr x) (length (car x)) 0))
 589                                          item-list)))
 590     (help-setup-xref nil (interactive-p))
 591     (with-output-to-temp-buffer (help-buffer)
 592       (with-current-buffer standard-output
 593         (set-buffer-multibyte multibyte-p)
 594         (let ((formatter (format "%%%ds:" max-width)))
 595           (dolist (elt item-list)
 596             (when (cadr elt)
 597               (insert (format formatter (car elt)))
 598               (dolist (clm (cdr elt))
 599                 (if (eq (car-safe clm) 'insert-text-button)
 600                     (progn (insert " ") (eval clm))
 601                   (when (>= (+ (current-column)
 602                                (or (string-match "\n" clm)
 603                                    (string-width clm))
 604                                1)
 605                             (window-width))
 606                     (insert "\n")
 607                     (indent-to (1+ max-width)))
 608                   (insert " " clm)))
 609               (insert "\n"))))
 610
 611         (when overlays
 612           (save-excursion
 613             (goto-char (point-min))
 614             (re-search-forward "character:[ \t\n]+")
 615             (let* ((end (+ (point) (length char-description))))
 616               (mapc #'(lambda (props)
 617                         (let ((o (make-overlay (point) end)))
 618                           (while props
 619                             (overlay-put o (car props) (nth 1 props))
 620                             (setq props (cddr props)))))
 621                     overlays))))
 622
 623         (when disp-vector
 624           (insert
 625            "\nThe display table entry is displayed by ")
 626           (if (display-graphic-p (selected-frame))
 627               (progn
 628                 (insert "these fonts (glyph codes):\n")
 629                 (dotimes (i (length disp-vector))
 630                   (insert (logand (car (aref disp-vector i)) #x7ffff) ?:
 631                           (propertize " " 'display '(space :align-to 5))
 632                           (if (cdr (aref disp-vector i))
 633                               (format "%s (#x%02X)" (cadr (aref disp-vector i))
 634                                       (cddr (aref disp-vector i)))
 635                             "-- no font --")
 636                           "\n")
 637                   (when (> (car (aref disp-vector i)) #x7ffff)
 638                     (let* ((face-id (lsh (car (aref disp-vector i)) -19))
 639                            (face (car (delq nil (mapcar
 640                                                  (lambda (face)
 641                                                    (and (eq (face-id face)
 642                                                             face-id) face))
 643                                                  (face-list))))))
 644                       (when face
 645                         (insert (propertize " " 'display '(space :align-to 5))
 646                                 "face: ")
 647                         (insert (concat "`" (symbol-name face) "'"))
 648                         (insert "\n"))))))
 649             (insert "these terminal codes:\n")
 650             (dotimes (i (length disp-vector))
 651               (insert (car (aref disp-vector i))
 652                       (propertize " " 'display '(space :align-to 5))
 653                       (or (cdr (aref disp-vector i)) "-- not encodable --")
 654                       "\n"))))
 655
 656         (when composition
 657           (insert "\nComposed")
 658           (if (car composition)
 659               (if (cadr composition)
 660                   (insert " with the surrounding characters \""
 661                           (car composition) "\" and \""
 662                           (cadr composition) "\"")
 663                 (insert " with the preceding character(s) \""
 664                         (car composition) "\""))
 665             (if (cadr composition)
 666                 (insert " with the following character(s) \""
 667                         (cadr composition) "\"")))
 668           (insert " by the rule:\n\t("
 669                   (mapconcat (lambda (x)
 670                                (format (if (consp x) "%S" "?%c") x))
 671                              (nth 2 composition)
 672                              " ")
 673                   ")")
 674           (insert  "\nThe component character(s) are displayed by ")
 675           (if (display-graphic-p (selected-frame))
 676               (progn
 677                 (insert "these fonts (glyph codes):")
 678                 (dolist (elt component-chars)
 679                   (insert "\n " (car elt) ?:
 680                           (propertize " " 'display '(space :align-to 5))
 681                           (if (cdr elt)
 682                               (format "%s (#x%02X)" (cadr elt) (cddr elt))
 683                             "-- no font --"))))
 684             (insert "these terminal codes:")
 685             (dolist (elt component-chars)
 686               (insert "\n  " (car elt) ":"
 687                       (propertize " " 'display '(space :align-to 5))
 688                       (or (cdr elt) "-- not encodable --"))))
 689           (insert "\nSee the variable `reference-point-alist' for "
 690                   "the meaning of the rule.\n"))
 691
 692         (if text-props-desc (insert text-props-desc))
 693         (setq help-xref-stack-item (list 'help-insert-string (buffer-string)))
 694         (toggle-read-only 1)
 695         (print-help-return-message)))))
 696
 697 (defalias 'describe-char-after 'describe-char)
 698 (make-obsolete 'describe-char-after 'describe-char "22.1")
 699
 700 (provide 'descr-text)
 701
 702 ;; arch-tag: fc55a498-f3e9-4312-b5bd-98cc02480af1
 703 ;;; descr-text.el ends here