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220 lines
6.9 KiB
EmacsLisp
220 lines
6.9 KiB
EmacsLisp
;;; asm-mode.el --- mode for editing assembler code
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;; Copyright (C) 1991 Free Software Foundation, Inc.
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;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
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;; Last-Modified: 14 Jul 1992
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;; Keywords: tools, languages
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;; @(#)asm-mode.el 1.7
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; This mode was written by Eric S. Raymond <esr@snark.thyrsus.com>,
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;; inspired by an earlier asm-mode by Martin Neitzel.
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;; This minor mode is based on text mode. It defines a private abbrev table
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;; that can be used to save abbrevs for assembler mnemonics. It binds just
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;; five keys:
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;;
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;; TAB tab to next tab stop
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;; : outdent preceding label, tab to tab stop
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;; ; place or move comment
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;; C-j, C-m newline and tab to tab stop
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;;
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;; Code is indented to the first tab stop level.
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;; The ; key inserts copies of the value of asm-comment-char at an
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;; appropriate spot.
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;; This mode runs two hooks:
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;; 1) An asm-set-comment-hook before the part of the initialization
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;; depending on asm-comment-char, and
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;; 2) an asm-mode-hook at the end of initialization.
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;;; Code:
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(defvar asm-comment-char ?;
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"*The comment-start character assumed by Asm mode.")
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(defvar asm-mode-syntax-table nil
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"Syntax table used while in Asm mode.")
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(defvar asm-mode-abbrev-table nil
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"Abbrev table used while in Asm mode.")
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(define-abbrev-table 'asm-mode-abbrev-table ())
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(defvar asm-mode-map nil
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"Keymap for Asm mode.")
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(if asm-mode-map
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nil
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(setq asm-mode-map (make-sparse-keymap))
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(define-key asm-mode-map ";" 'asm-comment)
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(define-key asm-mode-map ":" 'asm-colon)
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(define-key asm-mode-map "\C-i" 'tab-to-tab-stop)
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(define-key asm-mode-map "\C-j" 'asm-newline)
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(define-key asm-mode-map "\C-m" 'asm-newline)
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)
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(defvar asm-code-level-empty-comment-pattern nil)
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(defvar asm-flush-left-empty-comment-pattern nil)
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(defvar asm-inline-empty-comment-pattern nil)
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;;;###autoload
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(defun asm-mode ()
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"Major mode for editing typical assembler code.
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Features a private abbrev table and the following bindings:
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\\[asm-colon]\toutdent a preceding label, tab to next tab stop.
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\\[tab-to-tab-stop]\ttab to next tab stop.
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\\[asm-newline]\tnewline, then tab to next tab stop.
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\\[asm-comment]\tsmart placement of assembler comments.
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The character used for making comments is set by the variable
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`asm-comment-char' (which defaults to `?;').
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Alternatively, you may set this variable in `asm-set-comment-hook', which is
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called near the beginning of mode initialization.
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Turning on Asm mode runs the hook `asm-mode-hook' at the end of initialization.
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Special commands:
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\\{asm-mode-map}
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"
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(interactive)
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(kill-all-local-variables)
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(use-local-map asm-mode-map)
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(setq mode-name "Assembler")
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(setq major-mode 'asm-mode)
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(setq local-abbrev-table asm-mode-abbrev-table)
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(make-local-variable 'asm-mode-syntax-table)
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(setq asm-mode-syntax-table (make-syntax-table))
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(set-syntax-table asm-mode-syntax-table)
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(run-hooks 'asm-mode-set-comment-hook)
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(modify-syntax-entry asm-comment-char
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"<" asm-mode-syntax-table)
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(modify-syntax-entry ?\n
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">" asm-mode-syntax-table)
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(let ((cs (regexp-quote (char-to-string asm-comment-char))))
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(make-local-variable 'comment-start)
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(setq comment-start (concat cs " "))
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(make-local-variable 'comment-start-skip)
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(setq comment-start-skip (concat cs "+[ \t]*"))
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(setq asm-inline-empty-comment-pattern (concat "^.+" cs "+ *$"))
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(setq asm-code-level-empty-comment-pattern (concat "^[\t ]+" cs cs " *$"))
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(setq asm-flush-left-empty-comment-pattern (concat "^" cs cs cs " *$"))
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)
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(make-local-variable 'comment-end)
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(setq comment-end "")
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(make-local-variable 'comment-column)
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(setq comment-column 32)
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(setq fill-prefix "\t")
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(run-hooks 'asm-mode-hook)
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)
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(defun asm-colon ()
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"Insert a colon; if it follows a label, delete the label's indentation."
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(interactive)
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(save-excursion
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(beginning-of-line)
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(if (looking-at "[ \t]+\\(\\sw\\|\\s_\\)+$")
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(delete-horizontal-space)))
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(insert ":")
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(tab-to-tab-stop)
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)
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(defun asm-newline ()
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"Insert LFD + fill-prefix, to bring us back to code-indent level."
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(interactive)
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(if (eolp) (delete-horizontal-space))
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(insert "\n")
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(tab-to-tab-stop)
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)
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(defun asm-line-matches (pattern &optional withcomment)
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(save-excursion
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(beginning-of-line)
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(looking-at pattern)))
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(defun asm-pop-comment-level ()
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;; Delete an empty comment ending current line. Then set up for a new one,
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;; on the current line if it was all comment, otherwise above it
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(end-of-line)
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(delete-horizontal-space)
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(while (= (preceding-char) asm-comment-char)
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(delete-backward-char 1))
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(delete-horizontal-space)
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(if (bolp)
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nil
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(beginning-of-line)
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(open-line 1))
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)
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(defun asm-comment ()
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"Convert an empty comment to a `larger' kind, or start a new one.
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These are the known comment classes:
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1 -- comment to the right of the code (at the comment-column)
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2 -- comment on its own line, indented like code
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3 -- comment on its own line, beginning at the left-most column.
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Suggested usage: while writing your code, trigger asm-comment
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repeatedly until you are satisfied with the kind of comment."
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(interactive)
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(cond
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;; Blank line? Then start comment at code indent level.
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((asm-line-matches "^[ \t]*$")
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(delete-horizontal-space)
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(tab-to-tab-stop)
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(insert asm-comment-char comment-start))
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;; Nonblank line with no comment chars in it?
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;; Then start a comment at the current comment column
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((asm-line-matches (format "^[^%c]+$" asm-comment-char))
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(indent-for-comment))
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;; Flush-left comment present? Just insert character.
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((asm-line-matches asm-flush-left-empty-comment-pattern)
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(insert asm-comment-char))
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;; Empty code-level comment already present?
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;; Then start flush-left comment, on line above if this one is nonempty.
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((asm-line-matches asm-code-level-empty-comment-pattern)
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(asm-pop-comment-level)
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(insert asm-comment-char asm-comment-char comment-start))
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;; Empty comment ends line?
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;; Then make code-level comment, on line above if this one is nonempty.
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((asm-line-matches asm-inline-empty-comment-pattern)
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(asm-pop-comment-level)
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(tab-to-tab-stop)
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(insert asm-comment-char comment-start))
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;; If all else fails, insert character
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(t
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(insert asm-comment-char))
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)
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(end-of-line))
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;;; asm-mode.el ends here
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