;;; asm-mode.el --- mode for editing assembler code
-;; Copyright (C) 1991 Free Software Foundation, Inc.
+;; Copyright (C) 1991, 2003 Free Software Foundation, Inc.
;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
;; Maintainer: FSF
"Mode for editing assembler code."
:group 'languages)
-(defcustom asm-comment-char ?;
+(defcustom asm-comment-char ?\;
"*The comment-start character assumed by Asm mode."
:type 'character
:group 'asm)
-(defvar asm-mode-syntax-table nil
+(defvar asm-mode-syntax-table
+ (let ((st (make-syntax-table)))
+ (modify-syntax-entry ?\n ">" st)
+ (modify-syntax-entry ?/ ". 14b" st)
+ (modify-syntax-entry ?* ". 23b" st)
+ st)
"Syntax table used while in Asm mode.")
(defvar asm-mode-abbrev-table nil
"Abbrev table used while in Asm mode.")
(define-abbrev-table 'asm-mode-abbrev-table ())
-(defvar asm-mode-map nil
+(defvar asm-mode-map
+ (let ((map (make-sparse-keymap)))
+ ;; Note that the comment character isn't set up until asm-mode is called.
+ (define-key map ":" 'asm-colon)
+ (define-key map "\C-c;" 'comment-region)
+ (define-key map "\C-j" 'newline-and-indent)
+ (define-key map "\C-m" 'newline-and-indent)
+ map)
"Keymap for Asm mode.")
-(if asm-mode-map
- nil
- (setq asm-mode-map (make-sparse-keymap))
- ;; Note that the comment character isn't set up until asm-mode is called.
- (define-key asm-mode-map ":" 'asm-colon)
- (define-key asm-mode-map "\C-c;" 'comment-region)
- (define-key asm-mode-map "\C-i" 'tab-to-tab-stop)
- (define-key asm-mode-map "\C-j" 'asm-newline)
- (define-key asm-mode-map "\C-m" 'asm-newline)
- )
-
(defconst asm-font-lock-keywords
- '(("^\\(\\(\\sw\\|\\s_\\)+\\)\\>:?[ \t]*\\(\\sw+\\)?"
+ '(("^\\(\\(\\sw\\|\\s_\\)+\\)\\>:?[ \t]*\\(\\sw+\\(\\.\\sw+\\)*\\)?"
(1 font-lock-function-name-face) (3 font-lock-keyword-face nil t))
- ("^\\s +\\(\\(\\sw\\|\\s_\\)+\\)" 1 font-lock-keyword-face))
+ ;; label started from ".".
+ ("^\\(\\.\\(\\sw\\|\\s_\\)+\\)\\>:"
+ 1 font-lock-function-name-face)
+ ("^\\((\\sw+)\\)?\\s +\\(\\(\\.?\\sw\\|\\s_\\)+\\(\\.\\sw+\\)*\\)"
+ 2 font-lock-keyword-face)
+ ;; directive started from ".".
+ ("^\\(\\.\\(\\sw\\|\\s_\\)+\\)\\>[^:]?"
+ 1 font-lock-keyword-face))
"Additional expressions to highlight in Assembler mode.")
-(defvar asm-code-level-empty-comment-pattern nil)
-(defvar asm-flush-left-empty-comment-pattern nil)
-(defvar asm-inline-empty-comment-pattern nil)
-
;;;###autoload
(defun asm-mode ()
"Major mode for editing typical assembler code.
\\[asm-comment]\tsmart placement of assembler comments.
The character used for making comments is set by the variable
-`asm-comment-char' (which defaults to `?;').
+`asm-comment-char' (which defaults to `?\\;').
Alternatively, you may set this variable in `asm-mode-set-comment-hook',
which is called near the beginning of mode initialization.
Turning on Asm mode runs the hook `asm-mode-hook' at the end of initialization.
Special commands:
-\\{asm-mode-map}
-"
+\\{asm-mode-map}"
(interactive)
(kill-all-local-variables)
(setq mode-name "Assembler")
(setq local-abbrev-table asm-mode-abbrev-table)
(make-local-variable 'font-lock-defaults)
(setq font-lock-defaults '(asm-font-lock-keywords))
- (make-local-variable 'asm-mode-syntax-table)
- (setq asm-mode-syntax-table (make-syntax-table))
- (set-syntax-table asm-mode-syntax-table)
+ (set (make-local-variable 'indent-line-function) 'asm-indent-line)
+ ;; Stay closer to the old TAB behavior (was tab-to-tab-stop).
+ (set (make-local-variable 'tab-always-indent) nil)
(run-hooks 'asm-mode-set-comment-hook)
;; Make our own local child of asm-mode-map
;; so we can define our own comment character.
(use-local-map (nconc (make-sparse-keymap) asm-mode-map))
(local-set-key (vector asm-comment-char) 'asm-comment)
-
- (modify-syntax-entry asm-comment-char
- "<" asm-mode-syntax-table)
- (modify-syntax-entry ?\n
- ">" asm-mode-syntax-table)
- (let ((cs (regexp-quote (char-to-string asm-comment-char))))
- (make-local-variable 'comment-start)
- (setq comment-start (concat cs " "))
- (make-local-variable 'comment-start-skip)
- (setq comment-start-skip (concat cs "+[ \t]*"))
- (setq asm-inline-empty-comment-pattern (concat "^.+" cs "+ *$"))
- (setq asm-code-level-empty-comment-pattern (concat "^[\t ]+" cs cs " *$"))
- (setq asm-flush-left-empty-comment-pattern (concat "^" cs cs cs " *$"))
- )
+ (set-syntax-table (make-syntax-table asm-mode-syntax-table))
+ (modify-syntax-entry asm-comment-char "<")
+
+ (make-local-variable 'comment-start)
+ (setq comment-start (string asm-comment-char))
+ (make-local-variable 'comment-add)
+ (setq comment-add 1)
+ (make-local-variable 'comment-start-skip)
+ (setq comment-start-skip "\\(?:\\s<+\\|/\\*+\\)[ \t]*")
+ (make-local-variable 'comment-end-skip)
+ (setq comment-end-skip "[ \t]*\\(\\s>\\|\\*+/\\)")
(make-local-variable 'comment-end)
(setq comment-end "")
- (make-local-variable 'comment-column)
- (setq comment-column 32)
(setq fill-prefix "\t")
- (run-hooks 'asm-mode-hook))
-\f
+ (run-mode-hooks 'asm-mode-hook))
+
+(defun asm-indent-line ()
+ "Auto-indent the current line."
+ (interactive)
+ (let* ((savep (point))
+ (indent (condition-case nil
+ (save-excursion
+ (forward-line 0)
+ (skip-chars-forward " \t")
+ (if (>= (point) savep) (setq savep nil))
+ (max (asm-calculate-indentation) 0))
+ (error 0))))
+ (if savep
+ (save-excursion (indent-line-to indent))
+ (indent-line-to indent))))
+
+(defun asm-calculate-indentation ()
+ (or
+ ;; Flush labels to the left margin.
+ (and (looking-at "\\(\\sw\\|\\s_\\)+:") 0)
+ ;; Same thing for `;;;' comments.
+ (and (looking-at "\\s<\\s<\\s<") 0)
+ ;; Simple `;' comments go to the comment-column.
+ (and (looking-at "\\s<\\(\\S<\\|\\'\\)") comment-column)
+ ;; The rest goes at the first tab stop.
+ (or (car tab-stop-list) tab-width)))
+
(defun asm-colon ()
"Insert a colon; if it follows a label, delete the label's indentation."
(interactive)
- (save-excursion
- (beginning-of-line)
- (if (looking-at "[ \t]+\\(\\sw\\|\\s_\\)+$")
- (delete-horizontal-space)))
- (insert ":")
- (tab-to-tab-stop)
- )
-
-(defun asm-newline ()
- "Insert LFD + fill-prefix, to bring us back to code-indent level."
- (interactive)
- (if (eolp) (delete-horizontal-space))
- (insert "\n")
- (tab-to-tab-stop)
- )
-
-(defun asm-line-matches (pattern &optional withcomment)
- (save-excursion
- (beginning-of-line)
- (looking-at pattern)))
-
-(defun asm-pop-comment-level ()
- ;; Delete an empty comment ending current line. Then set up for a new one,
- ;; on the current line if it was all comment, otherwise above it
- (end-of-line)
- (delete-horizontal-space)
- (while (= (preceding-char) asm-comment-char)
- (delete-backward-char 1))
- (delete-horizontal-space)
- (if (bolp)
- nil
- (beginning-of-line)
- (open-line 1))
- )
-
+ (let ((labelp nil))
+ (save-excursion
+ (skip-syntax-backward "w_")
+ (skip-syntax-backward " ")
+ (if (setq labelp (bolp)) (delete-horizontal-space)))
+ (call-interactively 'self-insert-command)
+ (when labelp
+ (delete-horizontal-space)
+ (tab-to-tab-stop))))
+
+;; Obsolete since Emacs-21.4.
+(defalias 'asm-newline 'newline-and-indent)
(defun asm-comment ()
"Convert an empty comment to a `larger' kind, or start a new one.
Suggested usage: while writing your code, trigger asm-comment
repeatedly until you are satisfied with the kind of comment."
(interactive)
+ (comment-normalize-vars)
+ (let (comempty comment)
+ (save-excursion
+ (beginning-of-line)
+ (setq comment (comment-search-forward (line-end-position) t))
+ (setq comempty (looking-at "[ \t]*$")))
+
(cond
;; Blank line? Then start comment at code indent level.
- ((asm-line-matches "^[ \t]*$")
- (delete-horizontal-space)
- (tab-to-tab-stop)
- (insert asm-comment-char comment-start))
-
- ;; Nonblank line with no comment chars in it?
- ;; Then start a comment at the current comment column
- ((asm-line-matches (format "^[^%c\n]+$" asm-comment-char))
+ ;; Just like `comment-dwim'. -stef
+ ((save-excursion (beginning-of-line) (looking-at "^[ \t]*$"))
+ (indent-according-to-mode)
+ (insert asm-comment-char asm-comment-char ?\ ))
+
+ ;; Nonblank line w/o comment => start a comment at comment-column.
+ ;; Also: point before the comment => jump inside.
+ ((or (null comment) (< (point) comment))
(indent-for-comment))
- ;; Flush-left comment present? Just insert character.
- ((asm-line-matches asm-flush-left-empty-comment-pattern)
+ ;; Flush-left or non-empty comment present => just insert character.
+ ((or (not comempty) (save-excursion (goto-char comment) (bolp)))
(insert asm-comment-char))
- ;; Empty code-level comment already present?
- ;; Then start flush-left comment, on line above if this one is nonempty.
- ((asm-line-matches asm-code-level-empty-comment-pattern)
- (asm-pop-comment-level)
- (insert asm-comment-char asm-comment-char comment-start))
-
- ;; Empty comment ends line?
- ;; Then make code-level comment, on line above if this one is nonempty.
- ((asm-line-matches asm-inline-empty-comment-pattern)
- (asm-pop-comment-level)
- (tab-to-tab-stop)
- (insert asm-comment-char comment-start))
+ ;; Empty code-level comment => upgrade to next comment level.
+ ((save-excursion (goto-char comment) (skip-chars-backward " \t") (bolp))
+ (goto-char comment)
+ (insert asm-comment-char)
+ (indent-for-comment))
- ;; If all else fails, insert character
+ ;; Empty comment ends non-empty code line => new comment above.
(t
- (insert asm-comment-char))
-
- )
- (end-of-line))
+ (goto-char comment)
+ (skip-chars-backward " \t")
+ (delete-region (point) (line-end-position))
+ (beginning-of-line) (insert "\n") (backward-char)
+ (asm-comment)))))
(provide 'asm-mode)
+;;; arch-tag: 210e695f-f338-4376-8913-a4c5c72ac848
;;; asm-mode.el ends here