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1 ;;; asm-mode.el --- mode for editing assembler code
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2
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3 ;; Copyright (C) 1991 Free Software Foundation, Inc.
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4
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5 ;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
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6 ;; Maintainer: FSF
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7 ;; Keywords: tools, languages
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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24 ;; 02111-1307, USA.
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25
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26 ;;; Synched up with: FSF 19.34.
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27
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28 ;;; Commentary:
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29
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30 ;; This mode was written by Eric S. Raymond <esr@snark.thyrsus.com>,
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31 ;; inspired by an earlier asm-mode by Martin Neitzel.
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32
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33 ;; This minor mode is based on text mode. It defines a private abbrev table
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34 ;; that can be used to save abbrevs for assembler mnemonics. It binds just
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35 ;; five keys:
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36 ;;
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37 ;; TAB tab to next tab stop
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38 ;; : outdent preceding label, tab to tab stop
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39 ;; comment char place or move comment
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40 ;; asm-comment-char specifies which character this is;
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41 ;; you can use a different character in different
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42 ;; Asm mode buffers.
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43 ;; C-j, C-m newline and tab to tab stop
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44 ;;
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45 ;; Code is indented to the first tab stop level.
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46
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47 ;; This mode runs two hooks:
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48 ;; 1) An asm-mode-set-comment-hook before the part of the initialization
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49 ;; depending on asm-comment-char, and
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50 ;; 2) an asm-mode-hook at the end of initialization.
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51
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52 ;;; Code:
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53
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54 (defvar asm-comment-char ?;
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55 "*The comment-start character assumed by Asm mode.")
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56
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57 ;; XEmacs change (This is the primary difference, why was this
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58 ;; feature removed? -sb)
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59 (defvar asm-support-c-comments-p t
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60 "*Support C style comments. If t C style comments will be
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61 supported. This is mainly for the benefit of font-lock.")
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62
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63 (defvar asm-mode-syntax-table nil
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64 "Syntax table used while in Asm mode.")
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65
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66 (defvar asm-mode-abbrev-table nil
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67 "Abbrev table used while in Asm mode.")
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68 (define-abbrev-table 'asm-mode-abbrev-table ())
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69
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70 (defvar asm-mode-map nil
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71 "Keymap for Asm mode.")
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72
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73 (if asm-mode-map
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74 nil
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75 ;; XEmacs change
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76 (setq asm-mode-map (make-sparse-keymap 'asm-mode-map))
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77 ;; Note that the comment character isn't set up until asm-mode is called.
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78 (define-key asm-mode-map ":" 'asm-colon)
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79 (define-key asm-mode-map "\C-c;" 'comment-region)
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80 (define-key asm-mode-map "\C-i" 'tab-to-tab-stop)
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81 (define-key asm-mode-map "\C-j" 'asm-newline)
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82 (define-key asm-mode-map "\C-m" 'asm-newline)
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83 )
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84
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85 (defconst asm-font-lock-keywords
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86 '(("^\\(\\(\\sw\\|\\s_\\)+\\)\\>:?[ \t]*\\(\\sw+\\)?"
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87 (1 font-lock-function-name-face) (3 font-lock-keyword-face nil t))
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88 ("^\\s +\\(\\(\\sw\\|\\s_\\)+\\)" 1 font-lock-keyword-face))
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89 "Additional expressions to highlight in Assembler mode.")
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90
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91 ;; XEmacs change
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92 (put 'asm-mode 'font-lock-defaults '(asm-font-lock-keywords))
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93 (defvar asm-code-level-empty-comment-pattern nil)
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94 (defvar asm-flush-left-empty-comment-pattern nil)
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95 (defvar asm-inline-empty-comment-pattern nil)
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96
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97 ;;;###autoload
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98 (defun asm-mode ()
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99 "Major mode for editing typical assembler code.
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100 Features a private abbrev table and the following bindings:
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101
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102 \\[asm-colon]\toutdent a preceding label, tab to next tab stop.
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103 \\[tab-to-tab-stop]\ttab to next tab stop.
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104 \\[asm-newline]\tnewline, then tab to next tab stop.
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105 \\[asm-comment]\tsmart placement of assembler comments.
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106
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107 The character used for making comments is set by the variable
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108 `asm-comment-char' (which defaults to `?;').
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109
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110 Alternatively, you may set this variable in `asm-mode-set-comment-hook',
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111 which is called near the beginning of mode initialization.
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112
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113 Turning on Asm mode runs the hook `asm-mode-hook' at the end of initialization.
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114
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115 Special commands:
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116 \\{asm-mode-map}
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117 "
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118 (interactive)
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119 (kill-all-local-variables)
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120 (setq mode-name "Assembler")
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121 (setq major-mode 'asm-mode)
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122 (setq local-abbrev-table asm-mode-abbrev-table)
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123 (make-local-variable 'font-lock-defaults)
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124 (setq font-lock-defaults '(asm-font-lock-keywords))
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125 (make-local-variable 'asm-mode-syntax-table)
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126 (setq asm-mode-syntax-table (make-syntax-table))
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127 (set-syntax-table asm-mode-syntax-table)
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128
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129 (run-hooks 'asm-mode-set-comment-hook)
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130 ;; Make our own local child of asm-mode-map
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131 ;; so we can define our own comment character.
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132 ;; XEmacs change
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133 (let ((ourmap (make-sparse-keymap)))
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134 (set-keymap-parents ourmap (list asm-mode-map))
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135 (use-local-map ourmap))
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136 (local-set-key (vector asm-comment-char) 'asm-comment)
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137 ;; XEmacs change
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138 (if asm-support-c-comments-p
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139 (progn
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140 (modify-syntax-entry ?/ ". 14" asm-mode-syntax-table)
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141 (modify-syntax-entry ?* ". 23" asm-mode-syntax-table)
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142 (modify-syntax-entry asm-comment-char "< b" asm-mode-syntax-table)
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143 (modify-syntax-entry ?\n "> b" asm-mode-syntax-table))
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144 (progn
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145 (modify-syntax-entry asm-comment-char
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146 "<" asm-mode-syntax-table)
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147 (modify-syntax-entry ?\n
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148 ">" asm-mode-syntax-table)))
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149 (let ((cs (regexp-quote (char-to-string asm-comment-char))))
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150 (make-local-variable 'comment-start)
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151 (setq comment-start (concat cs " "))
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152 (make-local-variable 'comment-start-skip)
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153 (setq comment-start-skip (concat cs "+[ \t]*"))
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154 (setq asm-inline-empty-comment-pattern (concat "^.+" cs "+ *$"))
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155 (setq asm-code-level-empty-comment-pattern (concat "^[\t ]+" cs cs " *$"))
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156 (setq asm-flush-left-empty-comment-pattern (concat "^" cs cs cs " *$"))
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157 )
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158 (make-local-variable 'comment-end)
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159 (setq comment-end "")
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160 (make-local-variable 'comment-column)
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161 (setq comment-column 32)
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162 (setq fill-prefix "\t")
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163 (run-hooks 'asm-mode-hook))
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164
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165 (defun asm-colon ()
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166 "Insert a colon; if it follows a label, delete the label's indentation."
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167 (interactive)
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168 (save-excursion
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169 (beginning-of-line)
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170 (if (looking-at "[ \t]+\\(\\sw\\|\\s_\\)+$")
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171 (delete-horizontal-space)))
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172 (insert ":")
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173 (tab-to-tab-stop)
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174 )
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175
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176 (defun asm-newline ()
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177 "Insert LFD + fill-prefix, to bring us back to code-indent level."
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178 (interactive)
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179 (if (eolp) (delete-horizontal-space))
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180 (insert "\n")
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181 (tab-to-tab-stop)
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182 )
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183
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184 (defun asm-line-matches (pattern &optional withcomment)
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185 (save-excursion
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186 (beginning-of-line)
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187 (looking-at pattern)))
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188
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189 (defun asm-pop-comment-level ()
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190 ;; Delete an empty comment ending current line. Then set up for a new one,
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191 ;; on the current line if it was all comment, otherwise above it
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192 (end-of-line)
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193 (delete-horizontal-space)
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194 (while (= (preceding-char) asm-comment-char)
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195 (delete-backward-char 1))
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196 (delete-horizontal-space)
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197 (if (bolp)
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198 nil
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199 (beginning-of-line)
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200 (open-line 1))
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201 )
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202
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203
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204 (defun asm-comment ()
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205 "Convert an empty comment to a `larger' kind, or start a new one.
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206 These are the known comment classes:
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207
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208 1 -- comment to the right of the code (at the comment-column)
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209 2 -- comment on its own line, indented like code
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210 3 -- comment on its own line, beginning at the left-most column.
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211
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212 Suggested usage: while writing your code, trigger asm-comment
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213 repeatedly until you are satisfied with the kind of comment."
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214 (interactive)
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215 (cond
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216
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217 ;; Blank line? Then start comment at code indent level.
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218 ((asm-line-matches "^[ \t]*$")
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219 (delete-horizontal-space)
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220 (tab-to-tab-stop)
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221 (insert asm-comment-char comment-start))
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222
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223 ;; Nonblank line with no comment chars in it?
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224 ;; Then start a comment at the current comment column
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225 ((asm-line-matches (format "^[^%c\n]+$" asm-comment-char))
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226 (indent-for-comment))
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227
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228 ;; Flush-left comment present? Just insert character.
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229 ((asm-line-matches asm-flush-left-empty-comment-pattern)
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230 (insert asm-comment-char))
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231
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232 ;; Empty code-level comment already present?
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233 ;; Then start flush-left comment, on line above if this one is nonempty.
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234 ((asm-line-matches asm-code-level-empty-comment-pattern)
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235 (asm-pop-comment-level)
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236 (insert asm-comment-char asm-comment-char comment-start))
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237
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238 ;; Empty comment ends line?
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239 ;; Then make code-level comment, on line above if this one is nonempty.
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240 ((asm-line-matches asm-inline-empty-comment-pattern)
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241 (asm-pop-comment-level)
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242 (tab-to-tab-stop)
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243 (insert asm-comment-char comment-start))
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244
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245 ;; If all else fails, insert character
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246 (t
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247 (insert asm-comment-char))
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248
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249 )
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250 (end-of-line))
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251
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252 ;;; asm-mode.el ends here
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