xemacs-beta: lisp/modes/asm-mode.el comparison

comparison lisp/modes/asm-mode.el @ 0:376386a54a3c r19-14

Import from CVS: tag r19-14

author	cvs
date	Mon, 13 Aug 2007 08:45:50 +0200
parents
children	ac2d302a0011

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+:376386a54a3c
+;;; asm-mode.el --- mode for editing assembler code
+;; Copyright (C) 1991 Free Software Foundation, Inc.
+;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
+;; Maintainer: FSF
+;; Keywords: tools, languages
+;; This file is part of XEmacs.
+;; XEmacs 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.
+;; XEmacs 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 XEmacs; see the file COPYING.  If not, write to the Free
+;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;;; Synched up with: FSF 19.30.
+;;; 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:
+(defvar asm-comment-char ?;
+"*The comment-start character assumed by Asm mode.")
+(defvar asm-support-c-comments-p t
+"*Support C style comments.  If t C style comments will be
+supported.  This is mainly for the benefit of font-lock.")
+(defvar asm-mode-syntax-table nil
+"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
+"Keymap for Asm mode.")
+(if asm-mode-map
+nil
+(setq asm-mode-map (make-sparse-keymap 'asm-mode-map))
+;; 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-i"	'tab-to-tab-stop)
+(define-key asm-mode-map "\C-j"	'asm-newline)
+(define-key asm-mode-map "\C-m"	'asm-newline)
+)
+(defvar asm-code-level-empty-comment-pattern nil)
+(defvar asm-flush-left-empty-comment-pattern nil)
+(defvar asm-inline-empty-comment-pattern nil)
+(defconst asm-font-lock-keywords
+'(("^\\(\\(\\sw\\|\\s_\\)+\\)\\>:?[ \t]*\\(\\sw+\\)?"
+(1 font-lock-function-name-face) (3 font-lock-keyword-face nil t))
+("^\\s +\\(\\(\\sw\\|\\s_\\)+\\)" 1 font-lock-keyword-face))
+"Additional expressions to highlight in Assembler mode.")
+(put 'asm-mode 'font-lock-defaults '(asm-font-lock-keywords))
+;;;###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 'asm-mode-syntax-table)
+(setq asm-mode-syntax-table (make-syntax-table))
+(set-syntax-table asm-mode-syntax-table)
+(run-hooks 'asm-mode-set-comment-hook)
+;; Make our own local child of asm-mode-map
+;; so we can define our own comment character.
+(let ((ourmap (make-sparse-keymap)))
+(set-keymap-parents ourmap (list asm-mode-map))
+(use-local-map ourmap))
+(local-set-key (vector asm-comment-char) 'asm-comment)
+(if asm-support-c-comments-p
+(progn
+	(modify-syntax-entry ?/ ". 14" asm-mode-syntax-table)
+	(modify-syntax-entry ?* ". 23" asm-mode-syntax-table)
+	(modify-syntax-entry asm-comment-char "< b" asm-mode-syntax-table)
+	(modify-syntax-entry ?\n "> b" asm-mode-syntax-table))
+(progn
+(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 " *$"))
+)
+(make-local-variable 'comment-end)
+(setq comment-end "")
+(make-local-variable 'comment-column)
+(setq comment-column 32)
+(setq fill-prefix "\t")
+(run-hooks 'asm-mode-hook))
+(defun asm-colon ()
+"Insert a colon; if it follows a label, delete the label's indentation."
+(interactive)
+(save-excursion
+(beginning-of-line)
+(if (looking-at "[ \t]+\\(\\sw\\|\\s_\\)+$")
+	(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))
+)
+(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)
+(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))
+(indent-for-comment))
+;; Flush-left comment present?  Just insert character.
+((asm-line-matches asm-flush-left-empty-comment-pattern)
+(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))
+;; If all else fails, insert character
+(t
+(insert asm-comment-char))
+)
+(end-of-line))
+;;; asm-mode.el ends here

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comparison lisp/modes/asm-mode.el @ 0:376386a54a3c r19-14