`mime-view-scroll-down-content' -> `mime-view-scroll-down-entity'.
[elisp/semi.git] / mime-view.el
index ecca0f4..2997e99 100644 (file)
@@ -6,7 +6,7 @@
 ;; Created: 1994/7/13
 ;;     Renamed: 1994/8/31 from tm-body.el
 ;;     Renamed: 1997/02/19 from tm-view.el
-;; Version: $Revision: 0.8 $
+;; Version: $Revision: 0.60 $
 ;; Keywords: MIME, multimedia, mail, news
 
 ;; This file is part of SEMI (SEMI is Emacs MIME Interfaces).
 
 ;;; Code:
 
-(require 'tl-str)
-(require 'tl-list)
-(require 'tl-atype)
-(require 'tl-misc)
+(require 'cl)
 (require 'std11)
 (require 'mel)
-(require 'tm-ew-d)
+(require 'eword-decode)
 (require 'mime-parse)
 (require 'mime-text)
 
@@ -43,7 +40,7 @@
 ;;;
 
 (defconst mime-view-RCS-ID
-  "$Id: mime-view.el,v 0.8 1997-02-22 16:12:17 morioka Exp $")
+  "$Id: mime-view.el,v 0.60 1997-03-17 16:19:30 morioka Exp $")
 
 (defconst mime-view-version (get-version-string mime-view-RCS-ID))
 
      (method . mime-article/decode-message/partial)
      (mode . "play")
      )
+    ((type . "message/external-body")
+     ("access-type" . "anon-ftp")
+     (method . mime-article/decode-message/external-ftp)
+     )
     
     ((method "metamail" t "-m" "tm" "-x" "-d" "-z" "-e" 'file)
      (mode . "play")
 (defvar mime-view-childrens-header-showing-Content-Type-list
   '("message/rfc822" "message/news"))
 
-(defvar mime-view-default-showing-Content-Type-list
+(defvar mime-view-visible-media-type-list
   '("text/plain" nil "text/richtext" "text/enriched"
+    "text/rfc822-headers"
     "text/x-latex" "application/x-latex"
     "message/delivery-status"
     "application/pgp" "text/x-pgp"
     "application/octet-stream"
-    "application/x-selection" "application/x-comment"))
-
-(defvar mime-view-content-button-ignored-ctype-list
-  '("application/x-selection"))
+    "application/x-selection" "application/x-comment")
+  "*List of media-types to be able to display in MIME-View buffer.
+Each elements are string of TYPE/SUBTYPE, e.g. \"text/plain\".")
 
 (defvar mime-view-content-button-visible-ctype-list
   '("application/pgp"))
@@ -166,15 +167,9 @@ Each elements are regexp of field-name. [mime-view.el]")
          (apply (function regexp-or) mime-view-ignored-field-list)
          ":"))
 
-(defvar mime-view-visible-field-list
-  '("Dnas.*" "Message-Id")
+(defvar mime-view-visible-field-list '("Dnas.*" "Message-Id")
   "All fields that match this list will be displayed in MIME preview buffer.
-Each elements are regexp of field-name. [mime-view.el]")
-
-(defvar mime-view-visible-field-regexp
-  (concat "^"
-         (apply (function regexp-or) mime-view-visible-field-list)
-         ":"))
+Each elements are regexp of field-name.")
 
 (defvar mime-view-redisplay nil)
 
@@ -193,15 +188,13 @@ Each elements are regexp of field-name. [mime-view.el]")
 ;;; @@ predicate functions
 ;;;
 
-(defun mime-view-header-visible-p (rcnum cinfo &optional ctype)
+(defun mime-view-header-visible-p (rcnum cinfo)
+  "Return non-nil if header of current entity is visible."
   (or (null rcnum)
-      (progn
-       (setq ctype
-             (mime::content-info/type
-              (mime-article/rcnum-to-cinfo (cdr rcnum) cinfo)
-              ))
-       (member ctype mime-view-childrens-header-showing-Content-Type-list)
-       )))
+      (member (mime::content-info/type
+              (mime-article/rcnum-to-cinfo (cdr rcnum) cinfo))
+             mime-view-childrens-header-showing-Content-Type-list)
+      ))
 
 (defun mime-view-body-visible-p (rcnum cinfo &optional ctype)
   (let (ccinfo)
@@ -211,7 +204,7 @@ Each elements are regexp of field-name. [mime-view.el]")
               (setq ccinfo (mime-article/rcnum-to-cinfo rcnum cinfo))
               ))
        )
-    (and (member ctype mime-view-default-showing-Content-Type-list)
+    (and (member ctype mime-view-visible-media-type-list)
         (if (string-equal ctype "application/octet-stream")
             (progn
               (or ccinfo
@@ -224,16 +217,15 @@ Each elements are regexp of field-name. [mime-view.el]")
     ))
 
 
-;;; @@ content button
+;;; @@ entity button
 ;;;
 
-(defun mime-preview/insert-content-button
-  (rcnum cinfo ctype params subj encoding)
+(defun mime-view-insert-entity-button (rcnum cinfo ctype params subj encoding)
+  "Insert entity-button."
   (save-restriction
     (narrow-to-region (point)(point))
     (let ((access-type (assoc "access-type" params))
-         (charset (assoc "charset" params))
-         (num (or (assoc-value "x-part-number" params)
+         (num (or (cdr (assoc "x-part-number" params))
                   (if (consp rcnum)
                       (mapconcat (function
                                   (lambda (num)
@@ -248,73 +240,70 @@ Each elements are regexp of field-name. [mime-view.el]")
               (if server
                   (insert (format "[%s %s ([%s] %s)]\n" num subj
                                   access-type (cdr server)))
-                (let ((site (assoc-value "site" params))
-                      (dir (assoc-value "directory" params))
+                (let ((site (cdr (assoc "site" params)))
+                      (dir (cdr (assoc "directory" params)))
                       )
                   (insert (format "[%s %s ([%s] %s:%s)]\n" num subj
                                   access-type site dir))
                   )))
             )
            (t
-            (insert (concat "[" num " " subj))
-            (let ((rest
-                   (if (setq charset (cdr charset))
-                       (if encoding
-                           (format " <%s; %s (%s)>]\n"
-                                   ctype charset encoding)
-                         (format " <%s; %s>]\n" ctype charset)
-                         )
-                     (format " <%s>]\n" ctype)
-                     )))
-              (if (>= (+ (current-column)(length rest))(window-width))
-                  (setq rest (concat "\n\t" rest))
-                )
-              (insert rest)
-              ))))
-    (tm:add-button (point-min)(1- (point-max))
-                  (function mime-view-play-content))
+            (let ((charset (cdr (assoc "charset" params))))
+              (insert (concat "[" num " " subj))
+              (let ((rest
+                     (concat " <" ctype
+                             (if charset
+                                 (concat "; " charset)
+                               (if encoding (concat " (" encoding ")"))
+                               )
+                             ">]\n")))
+                (if (>= (+ (current-column)(length rest))(window-width))
+                    (insert "\n\t")
+                  )
+                (insert rest)
+                ))))
+      )
+    (mime-add-button (point-min)(1- (point-max))
+                    (function mime-view-play-current-entity))
     ))
 
-(defun mime-preview/default-content-button-function
+(defun mime-view-entity-button-function
   (rcnum cinfo ctype params subj encoding)
-  (if (and (consp rcnum)
-          (not (member
-                ctype
-                mime-view-content-button-ignored-ctype-list)))
-      (mime-preview/insert-content-button
-       rcnum cinfo ctype params subj encoding)
-    ))
-
-(defvar mime-preview/content-button-function
-  (function mime-preview/default-content-button-function))
+  "Insert entity button conditionally.
+Please redefine this function if you want to change default setting."
+  (or (null rcnum)
+      (string= ctype "application/x-selection")
+      (and (string= ctype "application/octet-stream")
+          (string= (mime::content-info/type
+                    (mime-article/rcnum-to-cinfo (cdr rcnum) cinfo))
+                   "multipart/encrypted"))
+      (mime-view-insert-entity-button rcnum cinfo ctype params subj encoding)
+      ))
 
 
 ;;; @@ content header filter
 ;;;
 
-(defun mime-preview/cut-header ()
+(defsubst mime-view-cut-header ()
   (goto-char (point-min))
-  (while (and
-         (re-search-forward mime-view-ignored-field-regexp nil t)
-         (let* ((beg (match-beginning 0))
-                (end (match-end 0))
-                (name (buffer-substring beg end))
-                )
-           (if (not (string-match mime-view-visible-field-regexp name))
-               (delete-region
-                beg
-                (save-excursion
-                  (and
-                   (re-search-forward "^\\([^ \t]\\|$\\)" nil t)
-                   (match-beginning 0)
-                   )))
-             )
-           t)))
-  )
+  (while (re-search-forward mime-view-ignored-field-regexp nil t)
+    (let* ((beg (match-beginning 0))
+          (end (match-end 0))
+          (name (buffer-substring beg end))
+          )
+      (or (member-if (function
+                     (lambda (regexp)
+                       (string-match regexp name)
+                       )) mime-view-visible-field-list)
+         (delete-region beg
+                        (if (re-search-forward "^\\([^ \t]\\|$\\)" nil t)
+                            (match-beginning 0)
+                          (point-max)))
+         ))))
 
 (defun mime-view-default-content-header-filter ()
-  (mime-preview/cut-header)
-  (mime/decode-message-header)
+  (mime-view-cut-header)
+  (eword-decode-header)
   )
 
 (defvar mime-view-content-header-filter-alist nil)
@@ -330,13 +319,14 @@ Each elements are regexp of field-name. [mime-view.el]")
     ))
 
 
-;;; @@ content separator
+;;; @@ entity separator
 ;;;
 
-(defun mime-preview/default-content-separator (rcnum cinfo ctype params subj)
-  (if (and (not (mime-view-header-visible-p rcnum cinfo ctype))
-          (not (mime-view-body-visible-p rcnum cinfo ctype))
-          )
+(defun mime-view-entity-separator-function (rcnum cinfo ctype params subj)
+  "Insert entity separator conditionally.
+Please redefine this function if you want to change default setting."
+  (or (mime-view-header-visible-p rcnum cinfo)
+      (mime-view-body-visible-p rcnum cinfo ctype)
       (progn
        (goto-char (point-max))
        (insert "\n")
@@ -346,18 +336,24 @@ Each elements are regexp of field-name. [mime-view.el]")
 ;;; @@ buffer local variables
 ;;;
 
-;; for XEmacs
-(defvar mime::article/preview-buffer nil)
-(defvar mime::article/code-converter nil)
-(defvar mime::preview/article-buffer nil)
+;;; @@@ in raw buffer
+;;;
 
 (make-variable-buffer-local 'mime::article/content-info)
+
+(defvar mime::article/preview-buffer nil)
 (make-variable-buffer-local 'mime::article/preview-buffer)
-(make-variable-buffer-local 'mime::article/code-converter)
+
+
+;;; @@@ in view buffer
+;;;
 
 (make-variable-buffer-local 'mime::preview/mother-buffer)
 (make-variable-buffer-local 'mime::preview/content-list)
+
+(defvar mime::preview/article-buffer nil)
 (make-variable-buffer-local 'mime::preview/article-buffer)
+
 (make-variable-buffer-local 'mime::preview/original-major-mode)
 (make-variable-buffer-local 'mime::preview/original-window-configuration)
 
@@ -366,8 +362,9 @@ Each elements are regexp of field-name. [mime-view.el]")
 ;;;
 
 (defvar mime-view-quitting-method-alist
-  '((mime/show-message-mode
-     . mime-view-quitting-method-for-mime/show-message-mode)))
+  '((mime-show-message-mode
+     . mime-view-quitting-method-for-mime-show-message-mode))
+  "Alist of major-mode vs. quitting-method of mime-view.")
 
 (defvar mime-view-over-to-previous-method-alist nil)
 (defvar mime-view-over-to-next-method-alist nil)
@@ -474,7 +471,7 @@ The compressed face will be piped to this command.")
     (let ((drest dest))
       (while pcl
        (setcar drest
-               (mime-preview/display-content (car pcl) cinfo the-buf obuf))
+               (mime-view-display-entity (car pcl) cinfo the-buf obuf))
        (setq pcl (cdr pcl)
              drest (cdr drest))
        ))
@@ -484,7 +481,8 @@ The compressed face will be piped to this command.")
     (list obuf dest)
     ))
 
-(defun mime-preview/display-content (content cinfo ibuf obuf)
+(defun mime-view-display-entity (content cinfo ibuf obuf)
+  "Display entity from content-info CONTENT."
   (let* ((beg (mime::content-info/point-min content))
         (end (mime::content-info/point-max content))
         (ctype (mime::content-info/type content))
@@ -503,15 +501,14 @@ The compressed face will be piped to this command.")
     (save-restriction
       (narrow-to-region beg end)
       (setq subj
-           (mime-eword/decode-string
+           (eword-decode-string
             (mime-article/get-subject params encoding)))
       )
     (set-buffer obuf)
     (setq nb (point))
     (narrow-to-region nb nb)
-    (funcall mime-preview/content-button-function
-            rcnum cinfo ctype params subj encoding)
-    (if (mime-view-header-visible-p rcnum cinfo ctype)
+    (mime-view-entity-button-function rcnum cinfo ctype params subj encoding)
+    (if (mime-view-header-visible-p rcnum cinfo)
        (mime-preview/display-header beg he)
       )
     (if (and (null rcnum)
@@ -519,7 +516,7 @@ The compressed face will be piped to this command.")
              ctype mime-view-content-button-visible-ctype-list))
        (save-excursion
          (goto-char (point-max))
-         (mime-preview/insert-content-button
+         (mime-view-insert-entity-button
           rcnum cinfo ctype params subj encoding)
          ))
     (cond ((mime-view-body-visible-p rcnum cinfo ctype)
@@ -533,14 +530,16 @@ The compressed face will be piped to this command.")
                (null (mime::content-info/children cinfo))
                )
           (goto-char (point-max))
-          (mime-preview/insert-content-button
+          (mime-view-insert-entity-button
            rcnum cinfo ctype params subj encoding)
           ))
-    (mime-preview/default-content-separator rcnum cinfo ctype params subj)
+    (mime-view-entity-separator-function rcnum cinfo ctype params subj)
     (prog1
        (progn
          (setq ne (point-max))
          (widen)
+         (put-text-property nb ne 'mime-view-raw-buffer ibuf)
+         (put-text-property nb ne 'mime-view-cinfo content)
          (mime::preview-content-info/create nb (1- ne) ibuf content)
          )
       (goto-char ne)
@@ -580,8 +579,8 @@ The compressed face will be piped to this command.")
     (let ((be (point-max)))
       (narrow-to-region be be)
       (insert mime-view-announcement-for-message/partial)
-      (tm:add-button (point-min)(point-max)
-                    (function mime-view-play-content))
+      (mime-add-button (point-min)(point-max)
+                      (function mime-view-play-current-entity))
       )))
 
 (defun mime-article/get-uu-filename (param &optional encoding)
@@ -700,34 +699,37 @@ The compressed face will be piped to this command.")
 
 (defconst mime-view-menu-title "MIME-View")
 (defconst mime-view-menu-list
-  '((up                 "Move to upper content"      mime-view-up-content)
-    (previous   "Move to previous content"   mime-view-previous-content)
-    (next       "Move to next content"       mime-view-next-content)
-    (scroll-down "Scroll to previous content" mime-view-scroll-down-content)
-    (scroll-up  "Scroll to next content"     mime-view-scroll-up-content)
-    (play       "Play Content"               mime-view-play-content)
-    (extract    "Extract Content"            mime-view-extract-content)
-    (print      "Print"                      mime-view-print-content)
+  '((up                 "Move to upper content"      mime-view-move-to-upper)
+    (previous   "Move to previous content"   mime-view-move-to-previous)
+    (next       "Move to next content"       mime-view-move-to-next)
+    (scroll-down "Scroll to previous content" mime-view-scroll-down-entity)
+    (scroll-up  "Scroll to next content"     mime-view-scroll-up-entity)
+    (play       "Play Content"               mime-view-play-current-entity)
+    (extract    "Extract Content"            mime-view-extract-current-entity)
+    (print      "Print"                      mime-view-print-current-entity)
     (x-face     "Show X Face"                mime-view-display-x-face)
     )
   "Menu for MIME Viewer")
 
-(if running-xemacs
-    (progn
-      (defvar mime-view-xemacs-popup-menu
-       (cons mime-view-menu-title
-             (mapcar (function
-                      (lambda (item)
-                        (vector (nth 1 item)(nth 2 item) t)
-                        ))
-                     mime-view-menu-list)))
-      (defun mime-view-xemacs-popup-menu (event)
-       "Popup the menu in the MIME Viewer buffer"
-       (interactive "e")
-       (select-window (event-window event))
-       (set-buffer (event-buffer event))
-       (popup-menu 'mime-view-xemacs-popup-menu))
-      ))
+(cond (running-xemacs
+       (defvar mime-view-xemacs-popup-menu
+        (cons mime-view-menu-title
+              (mapcar (function
+                       (lambda (item)
+                         (vector (nth 1 item)(nth 2 item) t)
+                         ))
+                      mime-view-menu-list)))
+       (defun mime-view-xemacs-popup-menu (event)
+        "Popup the menu in the MIME Viewer buffer"
+        (interactive "e")
+        (select-window (event-window event))
+        (set-buffer (event-buffer event))
+        (popup-menu 'mime-view-xemacs-popup-menu))
+       (defvar mouse-button-2 'button2)
+       )
+      (t
+       (defvar mouse-button-2 [mouse-2])
+       ))
 
 (defun mime-view-define-keymap (&optional default)
   (let ((mime-view-mode-map (if (keymapp default)
@@ -735,31 +737,31 @@ The compressed face will be piped to this command.")
                              (make-sparse-keymap)
                              )))
     (define-key mime-view-mode-map
-      "u"        (function mime-view-up-content))
+      "u"        (function mime-view-move-to-upper))
     (define-key mime-view-mode-map
-      "p"        (function mime-view-previous-content))
+      "p"        (function mime-view-move-to-previous))
     (define-key mime-view-mode-map
-      "n"        (function mime-view-next-content))
+      "n"        (function mime-view-move-to-next))
     (define-key mime-view-mode-map
-      "\e\t"     (function mime-view-previous-content))
+      "\e\t"     (function mime-view-move-to-previous))
     (define-key mime-view-mode-map
-      "\t"       (function mime-view-next-content))
+      "\t"       (function mime-view-move-to-next))
     (define-key mime-view-mode-map
-      " "        (function mime-view-scroll-up-content))
+      " "        (function mime-view-scroll-up-entity))
     (define-key mime-view-mode-map
-      "\M- "     (function mime-view-scroll-down-content))
+      "\M- "     (function mime-view-scroll-down-entity))
     (define-key mime-view-mode-map
-      "\177"     (function mime-view-scroll-down-content))
+      "\177"     (function mime-view-scroll-down-entity))
     (define-key mime-view-mode-map
       "\C-m"     (function mime-view-next-line-content))
     (define-key mime-view-mode-map
       "\C-\M-m"  (function mime-view-previous-line-content))
     (define-key mime-view-mode-map
-      "v"        (function mime-view-play-content))
+      "v"        (function mime-view-play-current-entity))
     (define-key mime-view-mode-map
-      "e"        (function mime-view-extract-content))
+      "e"        (function mime-view-extract-current-entity))
     (define-key mime-view-mode-map
-      "\C-c\C-p" (function mime-view-print-content))
+      "\C-c\C-p" (function mime-view-print-current-entity))
     (define-key mime-view-mode-map
       "a"        (function mime-view-follow-content))
     (define-key mime-view-mode-map
@@ -780,7 +782,7 @@ The compressed face will be piped to this command.")
              ))
     (if mouse-button-2
        (define-key mime-view-mode-map
-         mouse-button-2 (function tm:button-dispatcher))
+         mouse-button-2 (function mime-button-dispatcher))
       )
     (cond (running-xemacs
           (define-key mime-view-mode-map
@@ -882,27 +884,25 @@ button-2  Move to point under the mouse cursor
        (setq rpcl (cdr rpcl))
        ))))
 
-(autoload 'mime-preview/decode-content "mime-play")
-
-(defvar mime-view-decoding-mode "play" "MIME body decoding mode")
+(autoload 'mime-view-play-current-entity "mime-play" "Play current entity." t)
 
-(defun mime-view-play-content ()
+(defun mime-view-extract-current-entity ()
+  "Extract current entity into file (maybe).
+It decodes current entity to call internal or external method as
+\"extract\" mode.  The method is selected from variable
+`mime/content-decoding-condition'."
   (interactive)
-  (let ((mime-view-decoding-mode "play"))
-    (mime-preview/decode-content)
-    ))
-
-(defun mime-view-extract-content ()
-  (interactive)
-  (let ((mime-view-decoding-mode "extract"))
-    (mime-preview/decode-content)
-    ))
+  (mime-view-play-current-entity "extract")
+  )
 
-(defun mime-view-print-content ()
+(defun mime-view-print-current-entity ()
+  "Print current entity (maybe).
+It decodes current entity to call internal or external method as
+\"print\" mode.  The method is selected from variable
+`mime/content-decoding-condition'."
   (interactive)
-  (let ((mime-view-decoding-mode "print"))
-    (mime-preview/decode-content)
-    ))
+  (mime-view-play-current-entity "print")
+  )
 
 (defun mime-view-follow-content ()
   (interactive)
@@ -946,9 +946,7 @@ button-2    Move to point under the mouse cursor
               new-buf
               (the-buf (current-buffer))
               (a-buf mime::preview/article-buffer)
-              (hb (mime::content-info/point-min cinfo))
-              (he (mime::content-info/point-max cinfo))
-              fields from to cc reply-to subj mid f)
+              fields)
          (save-excursion
            (set-buffer (setq new-buf (get-buffer-create new-name)))
            (erase-buffer)
@@ -978,8 +976,8 @@ button-2    Move to point under the mouse cursor
                                  (concat "^"
                                          (apply (function regexp-or) fields)
                                          ":") ""))))
-                      (if (string-equal (mime::content-info/type ci)
-                                        "message/rfc822")
+                      (if (string= (mime::content-info/type ci)
+                                   "message/rfc822")
                           nil
                         (if str
                             (insert str)
@@ -1007,7 +1005,7 @@ button-2  Move to point under the mouse cursor
                      ))
                (setq rest (cdr rest))
                ))
-           (mime/decode-message-header)
+           (eword-decode-header)
            )
          (let ((f (cdr (assq mode mime-view-following-method-alist))))
            (if (functionp f)
@@ -1026,74 +1024,64 @@ button-2        Move to point under the mouse cursor
     (mime-view-x-face-function)
     ))
 
-(defun mime-view-up-content ()
+(defun mime-view-move-to-upper ()
+  "Move to upper entity.
+If there is no upper entity, call function `mime-view-quit'."
   (interactive)
-  (let* ((pc (mime-preview/point-pcinfo (point)))
-        (cinfo (mime::preview-content-info/content-info pc))
-        (rcnum (mime::content-info/rcnum cinfo))
-        )
-    (if rcnum
-       (let ((r (save-excursion
-                  (set-buffer (mime::preview-content-info/buffer pc))
-                   (mime-article/rcnum-to-cinfo (cdr rcnum))
-                  ))
-             (rpcl mime::preview/content-list)
-             cell)
-         (while (and
-                 (setq cell (car rpcl))
-                 (not (eq r (mime::preview-content-info/content-info cell)))
-                 )
-           (setq rpcl (cdr rpcl))
+  (let (cinfo)
+    (while (null (setq cinfo (get-text-property (point) 'mime-view-cinfo)))
+      (backward-char)
+      )
+    (let ((r (mime-article/rcnum-to-cinfo
+             (cdr (mime::content-info/rcnum cinfo))
+             (get-text-property 1 'mime-view-cinfo)))
+         point)
+      (catch 'tag
+       (while (setq point (previous-single-property-change
+                           (point) 'mime-view-cinfo))
+         (goto-char point)
+         (if (eq r (get-text-property (point) 'mime-view-cinfo))
+             (throw 'tag t)
            )
-         (goto-char (mime::preview-content-info/point-min cell))
          )
-      (mime-view-quit)
-      )))
+       (mime-view-quit)
+       ))))
 
-(defun mime-view-previous-content ()
+(defun mime-view-move-to-previous ()
+  "Move to previous entity.
+If there is no previous entity, it calls function registered in
+variable `mime-view-over-to-previous-method-alist'."
   (interactive)
-  (let* ((pcl mime::preview/content-list)
-        (p (point))
-        (i (- (length pcl) 1))
-        beg)
-    (catch 'tag
-      (while (> i 0)
-       (setq beg (mime::preview-content-info/point-min (nth i pcl)))
-       (if (> p beg)
-           (throw 'tag (goto-char beg))
-         )
-       (setq i (- i 1))
-       )
+  (while (null (get-text-property (point) 'mime-view-cinfo))
+    (backward-char)
+    )
+  (let ((point (previous-single-property-change (point) 'mime-view-cinfo)))
+    (if point
+       (goto-char point)
       (let ((f (assq mime::preview/original-major-mode
                     mime-view-over-to-previous-method-alist)))
        (if f
            (funcall (cdr f))
          ))
-      )
-    ))
+      )))
 
-(defun mime-view-next-content ()
+(defun mime-view-move-to-next ()
+  "Move to next entity.
+If there is no previous entity, it calls function registered in
+variable `mime-view-over-to-next-method-alist'."
   (interactive)
-  (let ((pcl mime::preview/content-list)
-       (p (point))
-       beg)
-    (catch 'tag
-      (while pcl
-       (setq beg (mime::preview-content-info/point-min (car pcl)))
-       (if (< p beg)
-           (throw 'tag (goto-char beg))
-         )
-       (setq pcl (cdr pcl))
-       )
+  (let ((point (next-single-property-change (point) 'mime-view-cinfo)))
+    (if point
+       (goto-char point)
       (let ((f (assq mime::preview/original-major-mode
                     mime-view-over-to-next-method-alist)))
        (if f
            (funcall (cdr f))
          ))
-      )
-    ))
+      )))
 
-(defun mime-view-scroll-up-content (&optional h)
+(defun mime-view-scroll-up-entity (&optional h)
+  "Scroll up current entity."
   (interactive)
   (or h
       (setq h (- (window-height) 1))
@@ -1121,11 +1109,11 @@ button-2        Move to point under the mouse cursor
       (if (> (point) np)
           (goto-char np)
         )
-      ;;(show-subtree)
       ))
   )
 
-(defun mime-view-scroll-down-content (&optional h)
+(defun mime-view-scroll-down-entity (&optional h)
+  "Scroll down current entity."
   (interactive)
   (or h
       (setq h (- (window-height) 1))
@@ -1159,12 +1147,12 @@ button-2        Move to point under the mouse cursor
 
 (defun mime-view-next-line-content ()
   (interactive)
-  (mime-view-scroll-up-content 1)
+  (mime-view-scroll-up-entity 1)
   )
 
 (defun mime-view-previous-line-content ()
   (interactive)
-  (mime-view-scroll-down-content 1)
+  (mime-view-scroll-down-entity 1)
   )
 
 (defun mime-view-quit ()