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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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134
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54 (defgroup asm nil
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55 "Assembler programming"
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56 :group 'languages)
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57
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58
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59 (defcustom asm-comment-char ?;
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60 "*The comment-start character assumed by Asm mode."
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61 :type 'sexp
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62 :group 'asm)
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63
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64 ;; XEmacs change (This is the primary difference, why was this
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65 ;; feature removed? -sb)
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134
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66 (defcustom asm-support-c-comments-p t
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67 "*Support C style comments. If t C style comments will be
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134
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68 supported. This is mainly for the benefit of font-lock."
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69 :type 'boolean
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70 :group 'asm)
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71
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134
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72 (defcustom asm-mode-syntax-table nil
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73 "Syntax table used while in Asm mode.")
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74
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75 (defvar asm-mode-abbrev-table nil
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76 "Abbrev table used while in Asm mode.")
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77 (define-abbrev-table 'asm-mode-abbrev-table ())
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78
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79 (defvar asm-mode-map nil
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80 "Keymap for Asm mode.")
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81
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82 (if asm-mode-map
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83 nil
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84 ;; XEmacs change
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85 (setq asm-mode-map (make-sparse-keymap 'asm-mode-map))
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86 ;; Note that the comment character isn't set up until asm-mode is called.
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87 (define-key asm-mode-map ":" 'asm-colon)
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88 (define-key asm-mode-map "\C-c;" 'comment-region)
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89 (define-key asm-mode-map "\C-i" 'tab-to-tab-stop)
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90 (define-key asm-mode-map "\C-j" 'asm-newline)
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91 (define-key asm-mode-map "\C-m" 'asm-newline)
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92 )
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93
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94 (defconst asm-font-lock-keywords
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95 '(("^\\(\\(\\sw\\|\\s_\\)+\\)\\>:?[ \t]*\\(\\sw+\\)?"
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96 (1 font-lock-function-name-face) (3 font-lock-keyword-face nil t))
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97 ("^\\s +\\(\\(\\sw\\|\\s_\\)+\\)" 1 font-lock-keyword-face))
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98 "Additional expressions to highlight in Assembler mode.")
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99
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100 ;; XEmacs change
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101 (put 'asm-mode 'font-lock-defaults '(asm-font-lock-keywords))
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102 (defvar asm-code-level-empty-comment-pattern nil)
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103 (defvar asm-flush-left-empty-comment-pattern nil)
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104 (defvar asm-inline-empty-comment-pattern nil)
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105
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106 ;;;###autoload
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107 (defun asm-mode ()
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108 "Major mode for editing typical assembler code.
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109 Features a private abbrev table and the following bindings:
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110
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111 \\[asm-colon]\toutdent a preceding label, tab to next tab stop.
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112 \\[tab-to-tab-stop]\ttab to next tab stop.
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113 \\[asm-newline]\tnewline, then tab to next tab stop.
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114 \\[asm-comment]\tsmart placement of assembler comments.
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115
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116 The character used for making comments is set by the variable
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117 `asm-comment-char' (which defaults to `?;').
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118
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119 Alternatively, you may set this variable in `asm-mode-set-comment-hook',
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120 which is called near the beginning of mode initialization.
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121
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122 Turning on Asm mode runs the hook `asm-mode-hook' at the end of initialization.
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123
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124 Special commands:
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125 \\{asm-mode-map}
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126 "
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127 (interactive)
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128 (kill-all-local-variables)
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129 (setq mode-name "Assembler")
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130 (setq major-mode 'asm-mode)
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131 (setq local-abbrev-table asm-mode-abbrev-table)
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132 (make-local-variable 'font-lock-defaults)
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133 (setq font-lock-defaults '(asm-font-lock-keywords))
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134 (make-local-variable 'asm-mode-syntax-table)
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135 (setq asm-mode-syntax-table (make-syntax-table))
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136 (set-syntax-table asm-mode-syntax-table)
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137
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138 (run-hooks 'asm-mode-set-comment-hook)
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139 ;; Make our own local child of asm-mode-map
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140 ;; so we can define our own comment character.
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141 ;; XEmacs change
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142 (let ((ourmap (make-sparse-keymap)))
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143 (set-keymap-parents ourmap (list asm-mode-map))
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144 (use-local-map ourmap))
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145 (local-set-key (vector asm-comment-char) 'asm-comment)
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146 ;; XEmacs change
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147 (if asm-support-c-comments-p
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148 (progn
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149 (modify-syntax-entry ?/ ". 14" asm-mode-syntax-table)
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150 (modify-syntax-entry ?* ". 23" asm-mode-syntax-table)
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151 (modify-syntax-entry asm-comment-char "< b" asm-mode-syntax-table)
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152 (modify-syntax-entry ?\n "> b" asm-mode-syntax-table))
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153 (progn
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154 (modify-syntax-entry asm-comment-char
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155 "<" asm-mode-syntax-table)
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156 (modify-syntax-entry ?\n
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157 ">" asm-mode-syntax-table)))
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158 (let ((cs (regexp-quote (char-to-string asm-comment-char))))
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159 (make-local-variable 'comment-start)
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160 (setq comment-start (concat cs " "))
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161 (make-local-variable 'comment-start-skip)
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162 (setq comment-start-skip (concat cs "+[ \t]*"))
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163 (setq asm-inline-empty-comment-pattern (concat "^.+" cs "+ *$"))
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164 (setq asm-code-level-empty-comment-pattern (concat "^[\t ]+" cs cs " *$"))
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165 (setq asm-flush-left-empty-comment-pattern (concat "^" cs cs cs " *$"))
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166 )
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167 (make-local-variable 'comment-end)
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168 (setq comment-end "")
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169 (make-local-variable 'comment-column)
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170 (setq comment-column 32)
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171 (setq fill-prefix "\t")
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172 (run-hooks 'asm-mode-hook))
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173
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174 (defun asm-colon ()
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175 "Insert a colon; if it follows a label, delete the label's indentation."
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176 (interactive)
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177 (save-excursion
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178 (beginning-of-line)
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179 (if (looking-at "[ \t]+\\(\\sw\\|\\s_\\)+$")
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180 (delete-horizontal-space)))
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181 (insert ":")
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182 (tab-to-tab-stop)
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183 )
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184
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185 (defun asm-newline ()
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186 "Insert LFD + fill-prefix, to bring us back to code-indent level."
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187 (interactive)
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188 (if (eolp) (delete-horizontal-space))
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189 (insert "\n")
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190 (tab-to-tab-stop)
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191 )
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192
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193 (defun asm-line-matches (pattern &optional withcomment)
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194 (save-excursion
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195 (beginning-of-line)
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196 (looking-at pattern)))
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197
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198 (defun asm-pop-comment-level ()
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199 ;; Delete an empty comment ending current line. Then set up for a new one,
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200 ;; on the current line if it was all comment, otherwise above it
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201 (end-of-line)
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202 (delete-horizontal-space)
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203 (while (= (preceding-char) asm-comment-char)
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204 (delete-backward-char 1))
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205 (delete-horizontal-space)
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206 (if (bolp)
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207 nil
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208 (beginning-of-line)
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209 (open-line 1))
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210 )
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211
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212
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213 (defun asm-comment ()
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214 "Convert an empty comment to a `larger' kind, or start a new one.
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215 These are the known comment classes:
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216
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217 1 -- comment to the right of the code (at the comment-column)
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218 2 -- comment on its own line, indented like code
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219 3 -- comment on its own line, beginning at the left-most column.
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220
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221 Suggested usage: while writing your code, trigger asm-comment
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222 repeatedly until you are satisfied with the kind of comment."
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223 (interactive)
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224 (cond
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225
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226 ;; Blank line? Then start comment at code indent level.
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227 ((asm-line-matches "^[ \t]*$")
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228 (delete-horizontal-space)
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229 (tab-to-tab-stop)
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230 (insert asm-comment-char comment-start))
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231
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232 ;; Nonblank line with no comment chars in it?
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233 ;; Then start a comment at the current comment column
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234 ((asm-line-matches (format "^[^%c\n]+$" asm-comment-char))
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235 (indent-for-comment))
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236
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237 ;; Flush-left comment present? Just insert character.
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238 ((asm-line-matches asm-flush-left-empty-comment-pattern)
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239 (insert asm-comment-char))
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240
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241 ;; Empty code-level comment already present?
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242 ;; Then start flush-left comment, on line above if this one is nonempty.
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243 ((asm-line-matches asm-code-level-empty-comment-pattern)
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244 (asm-pop-comment-level)
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245 (insert asm-comment-char asm-comment-char comment-start))
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246
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247 ;; Empty comment ends line?
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248 ;; Then make code-level comment, on line above if this one is nonempty.
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249 ((asm-line-matches asm-inline-empty-comment-pattern)
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250 (asm-pop-comment-level)
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251 (tab-to-tab-stop)
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252 (insert asm-comment-char comment-start))
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253
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254 ;; If all else fails, insert character
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255 (t
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256 (insert asm-comment-char))
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257
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258 )
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259 (end-of-line))
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260
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261 ;;; asm-mode.el ends here
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