;;; derived.el --- allow inheritance of major modes.
;;; (formerly mode-clone.el)
-;; Copyright (C) 1993, 1994 Free Software Foundation, Inc.
+;; Copyright (C) 1993, 1994, 1999 Free Software Foundation, Inc.
;; Author: David Megginson (dmeggins@aix1.uottawa.ca)
;; Maintainer: FSF
;; - assign the value 'hypertext-mode' to the 'major-mode' variable
;; - run the body of commands provided in the macro -- in this case,
;; set the local variable `case-fold-search' to nil.
-;; - **run the command (hypertext-mode-setup), which is empty by
-;; default, but may be redefined by the user to contain special
-;; commands (ie. setting local variables like 'outline-regexp')
-;; **NOTE: do not use this option -- it will soon be obsolete.
-;; - run anything assigned to 'hypertext-mode-hook' (obsolete, but
-;; supported for the sake of compatibility).
;;
;; The advantages of this system are threefold. First, text mode is
;; untouched -- if you had added the new keystroke to `text-mode-map,'
The arguments to this command are as follow:
CHILD: the name of the command for the derived mode.
-PARENT: the name of the command for the parent mode (ie. text-mode).
-NAME: a string which will appear in the status line (ie. \"Hypertext\")
+PARENT: the name of the command for the parent mode (e.g. `text-mode').
+NAME: a string which will appear in the status line (e.g. \"Hypertext\")
DOCSTRING: an optional documentation string--if you do not supply one,
the function will attempt to invent something useful.
BODY: forms to execute just before running the
without changing regular LaTeX mode. In this example, BODY is empty,
and DOCSTRING is generated by default.
-On a more complicated level, the following command uses sgml-mode as
+On a more complicated level, the following command uses `sgml-mode' as
the parent, and then sets the variable `case-fold-search' to nil:
(define-derived-mode article-mode sgml-mode \"Article\"
(setq docstring nil)))
(setq docstring (or docstring (derived-mode-make-docstring parent child)))
- (` (progn
- (derived-mode-init-mode-variables '(, child))
- (put '(, child) 'derived-mode-parent '(, parent))
- (defun (, child) ()
- (, docstring)
- (interactive)
+ `(progn
+ (derived-mode-init-mode-variables (quote ,child))
+ (defun ,child ()
+ ,docstring
+ (interactive)
; Run the parent.
- ((, parent))
+ (,parent)
; Identify special modes.
- (if (get '(, parent) 'special)
- (put '(, child) 'special t))
+ (if (get (quote ,parent) 'special)
+ (put (quote ,child) 'special t))
; Identify the child mode.
- (setq major-mode '(, child))
- (setq mode-name (, name))
+ (setq major-mode (quote ,child))
+ (setq mode-name ,name)
; Set up maps and tables.
- (derived-mode-set-keymap '(, child))
- (derived-mode-set-syntax-table '(, child))
- (derived-mode-set-abbrev-table '(, child))
+ (derived-mode-set-keymap (quote ,child))
+ (derived-mode-set-syntax-table (quote ,child))
+ (derived-mode-set-abbrev-table (quote ,child))
; Splice in the body (if any).
- (,@ body)
+ ,@body
;;; ; Run the setup function, if
;;; ; any -- this will soon be
;;; ; obsolete.
-;;; (derived-mode-run-setup-function '(, child))
- ; Run the hook, if any.
- (derived-mode-run-hooks '(, child))))))
+;;; (derived-mode-run-setup-function (quote ,child))
+ ; Run the hooks, if any.
+ (derived-mode-run-hooks (quote ,child)))))
;; PUBLIC: find the ultimate class of a derived mode.
(defun derived-mode-class (mode)
- "Find the class of a major mode.
+ "Find the class of a major MODE.
A mode's class is the first ancestor which is NOT a derived mode.
Use the `derived-mode-parent' property of the symbol to trace backwards."
(while (get mode 'derived-mode-parent)
;; Inline functions to construct various names from a mode name.
(defsubst derived-mode-setup-function-name (mode)
- "Construct a setup-function name based on a mode name."
+ "Construct a setup-function name based on a MODE name."
(intern (concat (symbol-name mode) "-setup")))
(defsubst derived-mode-hook-name (mode)
(intern (concat (symbol-name mode) "-hook")))
(defsubst derived-mode-map-name (mode)
- "Construct a map name based on a mode name."
+ "Construct a map name based on a MODE name."
(intern (concat (symbol-name mode) "-map")))
(defsubst derived-mode-syntax-table-name (mode)
- "Construct a syntax-table name based on a mode name."
+ "Construct a syntax-table name based on a MODE name."
(intern (concat (symbol-name mode) "-syntax-table")))
(defsubst derived-mode-abbrev-table-name (mode)
- "Construct an abbrev-table name based on a mode name."
+ "Construct an abbrev-table name based on a MODE name."
(intern (concat (symbol-name mode) "-abbrev-table")))
\f
;;;###autoload
(defun derived-mode-init-mode-variables (mode)
- "Initialise variables for a new mode.
+ "Initialise variables for a new MODE.
Right now, if they don't already exist, set up a blank keymap, an
empty syntax table, and an empty abbrev table -- these will be merged
the first time the mode is used."
(if (boundp (derived-mode-map-name mode))
t
- (eval (` (defvar (, (derived-mode-map-name mode))
+ (eval `(defvar ,(derived-mode-map-name mode)
(make-sparse-keymap)
- (, (format "Keymap for %s." mode)))))
+ ,(format "Keymap for %s." mode)))
(put (derived-mode-map-name mode) 'derived-mode-unmerged t))
(if (boundp (derived-mode-syntax-table-name mode))
t
- (eval (` (defvar (, (derived-mode-syntax-table-name mode))
- ;; Make a syntax table which doesn't specify anything
- ;; for any char. Valid data will be merged in by
- ;; derived-mode-merge-syntax-tables.
- (make-char-table 'syntax-table nil)
- (, (format "Syntax table for %s." mode)))))
+ (eval `(defvar ,(derived-mode-syntax-table-name mode)
+ ;; Make a syntax table which doesn't specify anything
+ ;; for any char. Valid data will be merged in by
+ ;; derived-mode-merge-syntax-tables.
+ (make-char-table 'syntax-table nil)
+ ,(format "Syntax table for %s." mode)))
(put (derived-mode-syntax-table-name mode) 'derived-mode-unmerged t))
(if (boundp (derived-mode-abbrev-table-name mode))
t
- (eval (` (defvar (, (derived-mode-abbrev-table-name mode))
- (progn (define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
- (make-abbrev-table))
- (, (format "Abbrev table for %s." mode)))))))
+ (eval `(defvar ,(derived-mode-abbrev-table-name mode)
+ (progn
+ (define-abbrev-table (derived-mode-abbrev-table-name mode) nil)
+ (make-abbrev-table))
+ ,(format "Abbrev table for %s." mode)))))
(defun derived-mode-make-docstring (parent child)
"Construct a docstring for a new mode if none is provided."
;; Utility functions for running a derived mode.
(defun derived-mode-set-keymap (mode)
- "Set the keymap of the new mode, maybe merging with the parent."
+ "Set the keymap of the new MODE, maybe merging with the parent."
(let* ((map-name (derived-mode-map-name mode))
(new-map (eval map-name))
(old-map (current-local-map)))
(put map-name 'derived-mode-unmerged nil)
(use-local-map new-map)))
-(defun derived-mode-set-syntax-table (mode)
- "Set the syntax table of the new mode, maybe merging with the parent."
+(defun derived-mode-set-syntax-table (mode)
+ "Set the syntax table of the new MODE, maybe merging with the parent."
(let* ((table-name (derived-mode-syntax-table-name mode))
(old-table (syntax-table))
(new-table (eval table-name)))
(set-syntax-table new-table)))
(defun derived-mode-set-abbrev-table (mode)
- "Set the abbrev table if it exists.
+ "Set the abbrev table for MODE if it exists.
Always merge its parent into it, since the merge is non-destructive."
(let* ((table-name (derived-mode-abbrev-table-name mode))
(old-table local-abbrev-table)
;; Functions to merge maps and tables.
(defun derived-mode-merge-keymaps (old new)
- "Merge an old keymap into a new one.
+ "Merge an OLD keymap into a NEW one.
The old keymap is set to be the last cdr of the new one, so that there will
be automatic inheritance."
+ ;; ?? Can this just use `set-keymap-parent'?
(let ((tail new))
;; Scan the NEW map for prefix keys.
(while (consp tail)
(setcdr (nthcdr (1- (length new)) new) old))
(defun derived-mode-merge-syntax-tables (old new)
- "Merge an old syntax table into a new one.
+ "Merge an OLD syntax table into a NEW one.
Where the new table already has an entry, nothing is copied from the old one."
(set-char-table-parent new old))
;; as the value of the symbol, and the hook as the function definition.
(defun derived-mode-merge-abbrev-tables (old new)
(if old
- (mapatoms
- (function
- (lambda (symbol)
- (or (intern-soft (symbol-name symbol) new)
- (define-abbrev new (symbol-name symbol)
- (symbol-value symbol) (symbol-function symbol)))))
+ (mapatoms
+ (lambda (symbol)
+ (or (intern-soft (symbol-name symbol) new)
+ (define-abbrev new (symbol-name symbol)
+ (symbol-value symbol) (symbol-function symbol))))
old)))
(provide 'derived)
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