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;;; asm-mode.el --- mode for editing assembler code
;; Copyright (C) 1991, 2003 Free Software Foundation, Inc.
;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
;; Maintainer: FSF
;; Keywords: tools, languages
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; This mode was written by Eric S. Raymond <esr@snark.thyrsus.com>,
;; inspired by an earlier asm-mode by Martin Neitzel.
;; This minor mode is based on text mode. It defines a private abbrev table
;; that can be used to save abbrevs for assembler mnemonics. It binds just
;; five keys:
;;
;; TAB tab to next tab stop
;; : outdent preceding label, tab to tab stop
;; comment char place or move comment
;; asm-comment-char specifies which character this is;
;; you can use a different character in different
;; Asm mode buffers.
;; C-j, C-m newline and tab to tab stop
;;
;; Code is indented to the first tab stop level.
;; This mode runs two hooks:
;; 1) An asm-mode-set-comment-hook before the part of the initialization
;; depending on asm-comment-char, and
;; 2) an asm-mode-hook at the end of initialization.
;;; Code:
(defgroup asm nil
"Mode for editing assembler code."
:group 'languages)
(defcustom asm-comment-char ?\;
"*The comment-start character assumed by Asm mode."
:type 'character
:group 'asm)
(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
(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.")
(defconst asm-font-lock-keywords
'(("^\\(\\(\\sw\\|\\s_\\)+\\)\\>:?[ \t]*\\(\\sw+\\(\\.\\sw+\\)*\\)?"
(1 font-lock-function-name-face) (3 font-lock-keyword-face nil t))
;; 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)
;; %register
("%\\sw+" . font-lock-variable-name-face))
"Additional expressions to highlight in Assembler mode.")
;;;###autoload
(defun asm-mode ()
"Major mode for editing typical assembler code.
Features a private abbrev table and the following bindings:
\\[asm-colon]\toutdent a preceding label, tab to next tab stop.
\\[tab-to-tab-stop]\ttab to next tab stop.
\\[asm-newline]\tnewline, then tab to next tab stop.
\\[asm-comment]\tsmart placement of assembler comments.
The character used for making comments is set by the variable
`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}"
(interactive)
(kill-all-local-variables)
(setq mode-name "Assembler")
(setq major-mode 'asm-mode)
(setq local-abbrev-table asm-mode-abbrev-table)
(make-local-variable 'font-lock-defaults)
(setq font-lock-defaults '(asm-font-lock-keywords))
(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)
(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 "")
(setq fill-prefix "\t")
(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)
(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-22.1.
(defalias 'asm-newline 'newline-and-indent)
(defun asm-comment ()
"Convert an empty comment to a `larger' kind, or start a new one.
These are the known comment classes:
1 -- comment to the right of the code (at the comment-column)
2 -- comment on its own line, indented like code
3 -- comment on its own line, beginning at the left-most column.
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]*$")))
(cond
;; Blank line? Then start comment at code indent level.
;; Just like `comment-dwim'. -stef
((save-excursion (beginning-of-line) (looking-at "^[ \t]*$"))
(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 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 => 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))
;; Empty comment ends non-empty code line => new comment above.
(t
(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
|
