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1 ;;; hide-ifdef-mode.el --- hides selected code within ifdef.
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2 ;; Keywords: c
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3
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4 ;;; Copyright (C) 1988 Brian Marick and Daniel LaLiberte
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5 ;;; Written by Brian Marick, at Gould, Computer Systems Division, Urbana IL.
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6 ;;; Extensively modified by Daniel LaLiberte (while at Gould).
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7 ;;;
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8 ;;; You may freely modify and distribute this, but keep a record
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9 ;;; of modifications and send comments to:
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10 ;;; liberte@a.cs.uiuc.edu or ihnp4!uiucdcs!liberte
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11 ;;; I will continue to upgrade hide-ifdef-mode
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12 ;;; with your contributions and will eventually offer it to FSF.
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13
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14 ;;; Revision 1.7 88/02/16 03:12:58 liberte
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15 ;;; Fixed comments and doc strings.
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16 ;;; Added optional prefix arg for ifdef motion commands.
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17 ;;;
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18 ;;; Revision 1.6 88/02/05 00:36:18 liberte
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19 ;;; Bug fixes.
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20 ;;; 1. A multi-line comment that starts on an #ifdef line
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21 ;;; now ends on that line.
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22 ;;; 2. Fix bad function name: hide-hif-ifdef-toggle-read-only
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23 ;;; 3. Make ifdef-block hiding work outside of ifdefs.
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24 ;;;
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25 ;;; Revision 1.5 88/01/31 23:19:31 liberte
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26 ;;; Major clean up.
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27 ;;; Prefix internal names with "hif-".
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28 ;;;
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29 ;;; Revision 1.4 88/01/30 14:09:38 liberte
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30 ;;; Add hide-ifdef-hiding and hide-ifdef-mode to minor-mode-alist.
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31 ;;;
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32 ;;; Revision 1.3 88/01/29 00:38:19 liberte
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33 ;;; Fix three bugs.
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34 ;;; 1. Function "defined" is just like lookup.
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35 ;;; 2. Skip to newline or cr in case text is hidden.
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36 ;;; 3. Use car of token list if just one symbol.
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37 ;;;
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38 ;;; Revision 1.2 88/01/28 23:32:46 liberte
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39 ;;; Use hide-ifdef-mode-prefix-key.
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40 ;;; Copy current-local-map so other buffers do not get
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41 ;;; hide-ifdef-mode bindings.
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42 ;;;
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43 ;;;--------------------------------------------------------------
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44
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45 ;;; Commentary:
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46
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47 ;;; To initialize, toggle the hide-ifdef minor mode with
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48 ;;;
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49 ;;; M-x hide-ifdef-mode
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50 ;;;
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51 ;;; This will set up key bindings and call hide-ifdef-mode-hook if it
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52 ;;; has a value. To explicitly hide ifdefs using a buffer-local
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53 ;;; define list (default empty), type
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54 ;;;
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55 ;;; M-x hide-ifdefs or C-c h
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56 ;;;
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57 ;;; Hide-ifdef suppresses the display of code that the preprocessor wouldn't
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58 ;;; pass through. The support of constant expressions in #if lines is
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59 ;;; limited to identifiers, parens, and the operators: &&, ||, !, and
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60 ;;; "defined". Please extend this.
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61 ;;;
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62 ;;; The hidden code is marked by ellipses (...). Be
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63 ;;; cautious when editing near ellipses, since the hidden text is
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64 ;;; still in the buffer, and you can move the point into it and modify
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65 ;;; text unawares. If you don't want to see the ellipses, set
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66 ;;; selective-display-ellipses to nil. But this can be dangerous.
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67 ;;; You can make your buffer read-only while hide-ifdef-hiding by setting
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68 ;;; hide-ifdef-read-only to a non-nil value. You can toggle this
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69 ;;; variable with hide-ifdef-toggle-read-only (C-c C-q).
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70 ;;;
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71 ;;; You can undo the effect of hide-ifdefs by typing
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72 ;;;
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73 ;;; M-x show-ifdefs or C-c s
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74 ;;;
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75 ;;; Use M-x hide-ifdef-define (C-c d) to define a symbol.
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76 ;;; Use M-x hide-ifdef-undef (C-c u) to undefine a symbol.
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77 ;;;
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78 ;;; If you define or undefine a symbol while hide-ifdef-mode is in effect,
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79 ;;; the display will be updated. Only the define list for the current
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80 ;;; buffer will be affected. You can save changes to the local define
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81 ;;; list with hide-ifdef-set-define-alist. This adds entries
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82 ;;; to hide-ifdef-define-alist.
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83 ;;;
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84 ;;; If you have defined a hide-ifdef-mode-hook, you can set
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85 ;;; up a list of symbols that may be used by hide-ifdefs as in the
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86 ;;; following example:
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87 ;;;
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88 ;;; (setq hide-ifdef-mode-hook
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89 ;;; '(lambda ()
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90 ;;; (if (not hide-ifdef-define-alist)
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91 ;;; (setq hide-ifdef-define-alist
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92 ;;; '((list1 ONE TWO)
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93 ;;; (list2 TWO THREE)
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94 ;;; )))
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95 ;;; (hide-ifdef-use-define-alist 'list2) ; use list2 by default
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96 ;;; ))
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97 ;;;
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98 ;;; You can call hide-ifdef-use-define-alist (C-c u) at any time to specify
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99 ;;; another list to use.
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100 ;;;
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101 ;;; To cause ifdefs to be hidden as soon as hide-ifdef-mode is called,
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102 ;;; set hide-ifdef-initially to non-nil.
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103 ;;;
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104 ;;; If you set hide-ifdef-lines to t, hide-ifdefs hides all the #ifdef lines.
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105 ;;; In the absence of highlighting, that might be a bad idea. If you set
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106 ;;; hide-ifdef-lines to nil (the default), the surrounding preprocessor
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107 ;;; lines will be displayed. That can be confusing in its own
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108 ;;; right. Other variations on display are possible, but not much
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109 ;;; better.
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110 ;;;
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111 ;;; You can explicitly hide or show individual ifdef blocks irrespective
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112 ;;; of the define list by using hide-ifdef-block and show-ifdef-block.
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113 ;;;
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114 ;;; You can move the point between ifdefs with forward-ifdef, backward-ifdef,
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115 ;;; up-ifdef, down-ifdef, next-ifdef, and previous-ifdef.
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116 ;;;
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117 ;;; If you have minor-mode-alist in your modeline (the default) two labels
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118 ;;; may appear. "Ifdef" will appear when hide-ifdef-mode is active. "Hiding"
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119 ;;; will appear when text may be hidden ("hide-ifdef-hiding" is non-nil).
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120
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121 ;;; Code:
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122
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123 (defvar hide-ifdef-mode-map nil
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124 "Keymap used with hide-ifdef mode")
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125
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126 (defconst hide-ifdef-mode-prefix-key "\C-c"
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127 "Prefix key for all hide-ifdef-mode commands.")
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128
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129 (defvar hide-ifdef-mode-map-before nil
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130 "Buffer-local variable to store a copy of the local keymap
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131 before hide-ifdef-mode modifies it.")
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132
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133 (defun define-hide-ifdef-mode-map ()
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134 (if hide-ifdef-mode-map
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135 () ; dont redefine it.
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136 (setq hide-ifdef-mode-map (make-sparse-keymap))
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137 (define-key hide-ifdef-mode-map "d" 'hide-ifdef-define)
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138 (define-key hide-ifdef-mode-map "u" 'hide-ifdef-undef)
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139 (define-key hide-ifdef-mode-map "D" 'hide-ifdef-set-define-alist)
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140 (define-key hide-ifdef-mode-map "U" 'hide-ifdef-use-define-alist)
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141
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142 (define-key hide-ifdef-mode-map "h" 'hide-ifdefs)
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143 (define-key hide-ifdef-mode-map "s" 'show-ifdefs)
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144 (define-key hide-ifdef-mode-map "\C-h" 'hide-ifdef-block)
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145 (define-key hide-ifdef-mode-map "\C-s" 'show-ifdef-block)
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146
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147 (define-key hide-ifdef-mode-map "\C-f" 'forward-ifdef)
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148 (define-key hide-ifdef-mode-map "\C-b" 'backward-ifdef)
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149 (define-key hide-ifdef-mode-map "\C-d" 'down-ifdef)
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150 (define-key hide-ifdef-mode-map "\C-u" 'up-ifdef)
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151 (define-key hide-ifdef-mode-map "\C-n" 'next-ifdef)
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152 (define-key hide-ifdef-mode-map "\C-p" 'previous-ifdef)
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153 (define-key hide-ifdef-mode-map "\C-q" 'hide-ifdef-toggle-read-only)
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154 (define-key hide-ifdef-mode-map
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155 (where-is-internal 'toggle-read-only nil t)
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156 'hide-ifdef-toggle-outside-read-only)
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157 )
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158 (fset 'hide-ifdef-mode-map hide-ifdef-mode-map) ; the function is the map
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159 )
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160
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161 (defun hif-update-mode-line ()
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162 "Update mode-line by setting buffer-modified to itself."
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163 (set-buffer-modified-p (buffer-modified-p)))
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164
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165
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166 (defvar hide-ifdef-mode nil
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167 "non-nil when hide-ifdef-mode is activated.")
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168
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169 (defvar hide-ifdef-hiding nil
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170 "non-nil when text may be hidden.")
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171
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172 (or (assq 'hide-ifdef-hiding minor-mode-alist)
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173 (setq minor-mode-alist
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174 (cons '(hide-ifdef-hiding " Hiding")
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175 minor-mode-alist)))
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176
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177 ;(or (assq 'hide-ifdef-mode minor-mode-alist)
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178 ; (setq minor-mode-alist
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179 ; (cons '(hide-ifdef-mode " Ifdef")
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180 ; minor-mode-alist)))
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181 ;; XEmacs: do it right.
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182 ;;;###autoload
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183 (add-minor-mode 'hide-ifdef-mode " Ifdef")
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184
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185 (defun hide-ifdef-mode (arg)
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186 "Toggle hide-ifdef-mode. Thus this is a minor mode, albeit a large one.
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187 With arg, turn hide-ifdef-mode on iff arg is positive.
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188 In hide-ifdef-mode, code within #ifdef constructs that the C preprocessor
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189 would eliminate may be hidden from view. Several variables affect
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190 how the hiding is done:
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191
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192 hide-ifdef-env
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193 An association list of defined and undefined symbols for the
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194 current buffer. Initially, the global value of hide-ifdef-env is used.
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195
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196 hide-ifdef-define-alist
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197 An association list of defined symbol lists.
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198 Use hide-ifdef-set-define-alist to save the current hide-ifdef-env
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199 and hide-ifdef-use-define-alist to set the current hide-ifdef-env
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200 from one of the lists in hide-ifdef-define-alist.
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201
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202 hide-ifdef-lines
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203 Set to non-nil to not show #if, #ifdef, #ifndef, #else, and
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204 #endif lines when hiding.
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205
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206 hide-ifdef-initially
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207 Indicates whether hide-ifdefs should be called when hide-ifdef-mode
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208 is activated.
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209
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210 hide-ifdef-read-only
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211 Set to non-nil if you want to make buffers read only while hiding.
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212 After show-ifdefs, read-only status is restored to previous value.
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213
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214 \\{hide-ifdef-mode-map}"
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215
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216 (interactive "P")
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217 (make-local-variable 'hide-ifdef-mode)
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218 (setq hide-ifdef-mode
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219 (if (null arg)
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220 (not hide-ifdef-mode)
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221 (> (prefix-numeric-value arg) 0)))
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222
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223 (hif-update-mode-line)
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224
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225 (if hide-ifdef-mode
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226 (progn
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227 ; fix c-mode syntax table so we can recognize whole symbols.
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228 (modify-syntax-entry ?_ "w")
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229 (modify-syntax-entry ?& ".")
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230 (modify-syntax-entry ?\| ".")
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231
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232 ; inherit global values
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233 (make-local-variable 'hide-ifdef-env)
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234 (setq hide-ifdef-env (default-value 'hide-ifdef-env))
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235
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236 (make-local-variable 'hide-ifdef-hiding)
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237 (setq hide-ifdef-hiding (default-value 'hide-ifdef-hiding))
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238
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239 (make-local-variable 'hif-outside-read-only)
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240 (setq hif-outside-read-only buffer-read-only)
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241
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242 (make-local-variable 'hide-ifdef-mode-map-before)
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243 (setq hide-ifdef-mode-map-before (current-local-map))
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244 (use-local-map (copy-keymap (current-local-map)))
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245 (local-unset-key hide-ifdef-mode-prefix-key)
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246 (local-set-key hide-ifdef-mode-prefix-key 'hide-ifdef-mode-map)
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247 (define-hide-ifdef-mode-map)
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248
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249 (run-hooks 'hide-ifdef-mode-hook)
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250
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251 (if hide-ifdef-initially
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252 (hide-ifdefs)
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253 (show-ifdefs))
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254 (message "Enter hide-ifdef-mode.")
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255 )
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256 ; else end hide-ifdef-mode
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257 (if hide-ifdef-hiding
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258 (show-ifdefs))
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259 (use-local-map hide-ifdef-mode-map-before)
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260 (message "Exit hide-ifdef-mode.")
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261 ))
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262
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263
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264 ;; from outline.el with docstring fixed.
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265 (defun hif-outline-flag-region (from to flag)
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266 "Hides or shows lines from FROM to TO, according to FLAG. If FLAG
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267 is \\n (newline character) then text is shown, while if FLAG is \\^M
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268 \(control-M) the text is hidden."
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269 (let ((modp (buffer-modified-p)))
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270 (unwind-protect (progn
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271 (subst-char-in-region from to
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272 (if (= flag ?\n) ?\^M ?\n)
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273 flag t) )
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274 (set-buffer-modified-p modp))
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275 ))
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276
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277 (defun hif-show-all ()
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278 "Show all of the text in the current buffer."
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279 (interactive)
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280 (hif-outline-flag-region (point-min) (point-max) ?\n))
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281
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282 (defun hide-ifdef-region (start end)
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283 "START is the start of a #if or #else form. END is the ending part.
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284 Everything including these lines is made invisible."
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285 (hif-outline-flag-region start end ?\^M)
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286 )
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287
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288 (defun hif-show-ifdef-region (start end)
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289 "Everything between START and END is made visible."
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290 (hif-outline-flag-region start end ?\n)
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291 )
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292
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293
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294
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295 ;===%%SF%% evaluation (Start) ===
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296
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297 (defvar hide-ifdef-evaluator 'eval
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298 "The evaluator is given a canonical form and returns T if text under
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299 that form should be displayed.")
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300
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301 (defvar hif-undefined-symbol nil
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302 "...is by default considered to be false.")
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303
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304 (defvar hide-ifdef-env nil
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305 "An alist of defined symbols and their values.")
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306
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307
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308 (defun hif-set-var (var value)
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309 "Prepend (var value) pair to hide-ifdef-env."
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310 (setq hide-ifdef-env (cons (cons var value) hide-ifdef-env)))
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311
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312
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313 (defun hif-lookup (var)
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314 ; (message "hif-lookup %s" var)
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315 (let ((val (assoc var hide-ifdef-env)))
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316 (if val
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317 (cdr val)
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318 hif-undefined-symbol)))
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319
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320 (defun hif-defined (var)
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321 (hif-lookup var)
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322 ; when #if expressions are fully supported, defined result should be 1
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323 ; (if (assoc var hide-ifdef-env)
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324 ; 1
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325 ; nil)
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326 )
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327
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328
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329 ;===%%SF%% evaluation (End) ===
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330
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331
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332
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333 ;===%%SF%% parsing (Start) ===
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334 ;;; The code that understands what ifs and ifdef in files look like.
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335
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336 (defconst hif-cpp-prefix "\\(^\\|\r\\)[ \t]*#[ \t]*")
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337 (defconst hif-ifndef-regexp (concat hif-cpp-prefix "ifndef"))
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338 (defconst hif-ifx-regexp (concat hif-cpp-prefix "if\\(n?def\\)?[ \t]+"))
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339 (defconst hif-else-regexp (concat hif-cpp-prefix "else"))
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340 (defconst hif-endif-regexp (concat hif-cpp-prefix "endif"))
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341 (defconst hif-ifx-else-endif-regexp
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342 (concat hif-ifx-regexp "\\|" hif-else-regexp "\\|" hif-endif-regexp))
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343
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344
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345 (defun hif-infix-to-prefix (token-list)
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346 "Convert list of tokens in infix into prefix list"
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347 ; (message "hif-infix-to-prefix: %s" token-list)
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348 (if (= 1 (length token-list))
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349 (` (hif-lookup (quote (, (car token-list)))))
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350 (hif-parse-if-exp token-list))
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351 )
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352
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353 ; pattern to match initial identifier, !, &&, ||, (, or ).
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354 (defconst hif-token-regexp "^\\(!\\|&&\\|||\\|[()]\\|\\w+\\)")
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355 (defconst hif-end-of-comment "\\*/")
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356
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357
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358 (defun hif-tokenize (expr-string)
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359 "Separate string into a list of tokens"
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360 (let ((token-list nil)
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361 (expr-start 0)
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362 (expr-length (length expr-string)))
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363
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364 (while (< expr-start expr-length)
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365 ; (message "expr-start = %d" expr-start) (sit-for 1)
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366 (cond
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367 ((string-match "^[ \t]+" expr-string expr-start)
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368 ; skip whitespace
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369 (setq expr-start (match-end 0))
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370 ; stick newline in string so ^ matches on the next string-match
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371 (aset expr-string (1- expr-start) ?\n)
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372 )
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373
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374 ((string-match "^/\\*" expr-string expr-start)
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375 (setq expr-start (match-end 0))
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376 (aset expr-string (1- expr-start) ?\n)
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377 (or
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378 (string-match hif-end-of-comment
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379 expr-string expr-start) ; eat comment
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380 (string-match "$" expr-string expr-start)) ; multi-line comment
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381 (setq expr-start (match-end 0))
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382 (aset expr-string (1- expr-start) ?\n)
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383 )
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384
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385 ((string-match hif-token-regexp expr-string expr-start)
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386 (let ((token (substring expr-string expr-start (match-end 0))))
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387 (setq expr-start (match-end 0))
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388 (aset expr-string (1- expr-start) ?\n)
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389 ; (message "token: %s" token) (sit-for 1)
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390 (setq token-list
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391 (cons
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392 (cond
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393 ((string-equal token "||") 'or)
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394 ((string-equal token "&&") 'and)
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395 ((string-equal token "!") 'not)
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396 ((string-equal token "defined") 'hif-defined)
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397 ((string-equal token "(") 'lparen)
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398 ((string-equal token ")") 'rparen)
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399 (t (intern token)))
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400 token-list))
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401 ))
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402 (t (error "Bad #if expression: %s" expr-string))
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403 ))
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404 (nreverse token-list)
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405 ))
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406
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407 ;;;-----------------------------------------------------------------
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408 ;;; Translate C preprocessor #if expressions using recursive descent.
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409 ;;; This parser is limited to the operators &&, ||, !, and "defined".
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410
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411 (defun hif-parse-if-exp (token-list)
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412 "Parse the TOKEN-LIST. Return translated list in prefix form."
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413 (hif-nexttoken)
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414 (prog1
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415 (hif-expr)
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416 (if token ; is there still a token?
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417 (error "Error: unexpected token: %s" token)))
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418 )
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419
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420 (defun hif-nexttoken ()
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421 "Pop the next token from token-list into the let variable \"token\"."
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422 (setq token (car token-list))
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423 (setq token-list (cdr token-list))
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424 token
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425 )
|
|
426
|
|
427 (defun hif-expr ()
|
|
428 "Parse and expression of the form
|
|
429 expr : term | expr '||' term."
|
|
430 (let ((result (hif-term)))
|
|
431 (while (eq token 'or)
|
|
432 (hif-nexttoken)
|
|
433 (setq result (list 'or result (hif-term))))
|
|
434 result
|
|
435 ))
|
|
436
|
|
437 (defun hif-term ()
|
|
438 "Parse a term of the form
|
|
439 term : factor | term '&&' factor."
|
|
440 (let ((result (hif-factor)))
|
|
441 (while (eq token 'and)
|
|
442 (hif-nexttoken)
|
|
443 (setq result (list 'and result (hif-factor))))
|
|
444 result
|
|
445 ))
|
|
446
|
|
447 (defun hif-factor ()
|
|
448 "Parse a factor of the form
|
|
449 factor : '!' factor | '(' expr ')' | 'defined(' id ')' | id."
|
|
450 (cond
|
|
451 ((eq token 'not)
|
|
452 (hif-nexttoken)
|
|
453 (list 'not (hif-factor)))
|
|
454
|
|
455 ((eq token 'lparen)
|
|
456 (hif-nexttoken)
|
|
457 (let ((result (hif-expr)))
|
|
458 (if (not (eq token 'rparen))
|
|
459 (error "Bad token in parenthesized expression: %s" token)
|
|
460 (hif-nexttoken)
|
|
461 result)))
|
|
462
|
|
463 ((eq token 'hif-defined)
|
|
464 (hif-nexttoken)
|
|
465 (if (not (eq token 'lparen))
|
|
466 (error "Error: expected \"(\" after \"defined\""))
|
|
467 (hif-nexttoken)
|
|
468 (let ((ident token))
|
|
469 (if (memq token '(or and not hif-defined lparen rparen))
|
|
470 (error "Error: unexpected token: %s" token))
|
|
471 (hif-nexttoken)
|
|
472 (if (not (eq token 'rparen))
|
|
473 (error "Error: expected \")\" after identifier"))
|
|
474 (hif-nexttoken)
|
|
475 (` (hif-defined (quote (, ident))))
|
|
476 ))
|
|
477
|
|
478 (t ; identifier
|
|
479 (let ((ident token))
|
|
480 (if (memq ident '(or and))
|
|
481 (error "Error: missing identifier"))
|
|
482 (hif-nexttoken)
|
|
483 (` (hif-lookup (quote (, ident))))
|
|
484 ))
|
|
485
|
|
486 ))
|
|
487
|
|
488 ;;;----------- end of parser -----------------------
|
|
489
|
|
490
|
|
491 (defun hif-canonicalize ()
|
|
492 "When at beginning of #ifX, returns a canonical (evaluatable)
|
|
493 form for the expression."
|
|
494 (save-excursion
|
|
495 (let ((negate (looking-at hif-ifndef-regexp)))
|
|
496 (re-search-forward hif-ifx-regexp)
|
|
497 (let* ((expr-string
|
|
498 (buffer-substring (point)
|
|
499 (progn (skip-chars-forward "^\n\r") (point))))
|
|
500 (expr (hif-infix-to-prefix (hif-tokenize expr-string))))
|
|
501 ; (message "hif-canonicalized: %s" expr)
|
|
502 (if negate
|
|
503 (list 'not expr)
|
|
504 expr)))))
|
|
505
|
|
506
|
|
507 (defun hif-find-any-ifX ()
|
|
508 "Position at beginning of next #if, #ifdef, or #ifndef, including one on
|
|
509 this line."
|
|
510 ; (message "find ifX at %d" (point))
|
|
511 (prog1
|
|
512 (re-search-forward hif-ifx-regexp (point-max) t)
|
|
513 (beginning-of-line)))
|
|
514
|
|
515
|
|
516 (defun hif-find-next-relevant ()
|
|
517 "Position at beginning of next #ifdef, #ifndef, #else, #endif,
|
|
518 NOT including one on this line."
|
|
519 ; (message "hif-find-next-relevant at %d" (point))
|
|
520 (end-of-line)
|
|
521 ; avoid infinite recursion by only going to beginning of line if match found
|
|
522 (if (re-search-forward hif-ifx-else-endif-regexp (point-max) t)
|
|
523 (beginning-of-line))
|
|
524 )
|
|
525
|
|
526 (defun hif-find-previous-relevant ()
|
|
527 "Position at beginning of previous #ifdef, #ifndef, #else, #endif,
|
|
528 NOT including one on this line."
|
|
529 ; (message "hif-find-previous-relevant at %d" (point))
|
|
530 (beginning-of-line)
|
|
531 ; avoid infinite recursion by only going to beginning of line if match found
|
|
532 (if (re-search-backward hif-ifx-else-endif-regexp (point-min) t)
|
|
533 (beginning-of-line)
|
|
534 )
|
|
535 )
|
|
536
|
|
537
|
|
538 (defun hif-looking-at-ifX () ;; Should eventually see #if
|
|
539 (looking-at hif-ifx-regexp))
|
|
540 (defun hif-looking-at-endif ()
|
|
541 (looking-at hif-endif-regexp))
|
|
542 (defun hif-looking-at-else ()
|
|
543 (looking-at hif-else-regexp))
|
|
544
|
|
545
|
|
546
|
|
547 (defun hif-ifdef-to-endif ()
|
|
548 "If positioned at #ifX or #else form, skip to corresponding #endif."
|
|
549 ; (message "hif-ifdef-to-endif at %d" (point)) (sit-for 1)
|
|
550 (hif-find-next-relevant)
|
|
551 (cond ((hif-looking-at-ifX)
|
|
552 (hif-ifdef-to-endif) ; find endif of nested if
|
|
553 (hif-ifdef-to-endif)) ; find outer endif or else
|
|
554 ((hif-looking-at-else)
|
|
555 (hif-ifdef-to-endif)) ; find endif following else
|
|
556 ((hif-looking-at-endif)
|
|
557 'done)
|
|
558 (t
|
|
559 (error "Missmatched #ifdef #endif pair"))
|
|
560 ))
|
|
561
|
|
562
|
|
563 (defun hif-endif-to-ifdef ()
|
|
564 "If positioned at #endif form, skip backward to corresponding #ifX."
|
|
565 ; (message "hif-endif-to-ifdef at %d" (point))
|
|
566 (let ((start (point)))
|
|
567 (hif-find-previous-relevant)
|
|
568 (if (= start (point))
|
|
569 (error "Missmatched #ifdef #endif pair")))
|
|
570 (cond ((hif-looking-at-endif)
|
|
571 (hif-endif-to-ifdef) ; find beginning of nested if
|
|
572 (hif-endif-to-ifdef)) ; find beginning of outer if or else
|
|
573 ((hif-looking-at-else)
|
|
574 (hif-endif-to-ifdef))
|
|
575 ((hif-looking-at-ifX)
|
|
576 'done)
|
|
577 (t ; never gets here
|
|
578 )))
|
|
579
|
|
580
|
|
581 (defun forward-ifdef (&optional arg)
|
|
582 "Move point to beginning of line of the next ifdef-endif.
|
|
583 With argument, do this that many times."
|
|
584 (interactive "p")
|
|
585 (or arg (setq arg 1))
|
|
586 (if (< arg 0)
|
|
587 (backward-ifdef (- arg)))
|
|
588 (while (< 0 arg)
|
|
589 (setq arg (- arg))
|
|
590 (let ((start (point)))
|
|
591 (if (not (hif-looking-at-ifX))
|
|
592 (hif-find-next-relevant))
|
|
593 (if (hif-looking-at-ifX)
|
|
594 (hif-ifdef-to-endif)
|
|
595 (goto-char start)
|
|
596 (error "No following #ifdef")
|
|
597 ))))
|
|
598
|
|
599
|
|
600 (defun backward-ifdef (&optional arg)
|
|
601 "Move point to beginning of the previous ifdef-endif.
|
|
602 With argument, do this that many times."
|
|
603 (interactive "p")
|
|
604 (or arg (setq arg 1))
|
|
605 (if (< arg 0)
|
|
606 (forward-ifdef (- arg)))
|
|
607 (while (< 0 arg)
|
|
608 (setq arg (1- arg))
|
|
609 (beginning-of-line)
|
|
610 (let ((start (point)))
|
|
611 (if (not (hif-looking-at-endif))
|
|
612 (hif-find-previous-relevant))
|
|
613 (if (hif-looking-at-endif)
|
|
614 (hif-endif-to-ifdef)
|
|
615 (goto-char start)
|
|
616 (error "No previous #ifdef")
|
|
617 ))))
|
|
618
|
|
619
|
|
620
|
|
621 (defun down-ifdef ()
|
|
622 "Move point to beginning of nested ifdef or else-part."
|
|
623 (interactive)
|
|
624 (let ((start (point)))
|
|
625 (hif-find-next-relevant)
|
|
626 (if (or (hif-looking-at-ifX) (hif-looking-at-else))
|
|
627 ()
|
|
628 (goto-char start)
|
|
629 (error "No following #ifdef")
|
|
630 )))
|
|
631
|
|
632
|
|
633 (defun up-ifdef ()
|
|
634 "Move point to beginning of enclosing ifdef or else-part."
|
|
635 (interactive)
|
|
636 (beginning-of-line)
|
|
637 (let ((start (point)))
|
|
638 (if (not (hif-looking-at-endif))
|
|
639 (hif-find-previous-relevant))
|
|
640 (if (hif-looking-at-endif)
|
|
641 (hif-endif-to-ifdef))
|
|
642 (if (= start (point))
|
|
643 (error "No previous #ifdef")
|
|
644 )))
|
|
645
|
|
646 (defun next-ifdef (&optional arg)
|
|
647 "Move to the beginning of the next #ifX, #else, or #endif.
|
|
648 With argument, do this that many times."
|
|
649 (interactive "p")
|
|
650 (or arg (setq arg 1))
|
|
651 (if (< arg 0)
|
|
652 (previous-ifdef (- arg)))
|
|
653 (while (< 0 arg)
|
|
654 (setq arg (1- arg))
|
|
655 (hif-find-next-relevant)
|
|
656 (if (eolp)
|
|
657 (progn
|
|
658 (beginning-of-line)
|
|
659 (error "No following #ifdefs, #elses, or #endifs")
|
|
660 ))))
|
|
661
|
|
662 (defun previous-ifdef (&optional arg)
|
|
663 "Move to the beginning of the previous #ifX, #else, or #endif.
|
|
664 With argument, do this that many times."
|
|
665 (interactive "p")
|
|
666 (or arg (setq arg 1))
|
|
667 (if (< arg 0)
|
|
668 (next-ifdef (- arg)))
|
|
669 (while (< 0 arg)
|
|
670 (setq arg (1- arg))
|
|
671 (let ((start (point)))
|
|
672 (hif-find-previous-relevant)
|
|
673 (if (= start (point))
|
|
674 (error "No previous #ifdefs, #elses, or #endifs")
|
|
675 ))))
|
|
676
|
|
677
|
|
678 ;===%%SF%% parsing (End) ===
|
|
679
|
|
680
|
|
681 ;===%%SF%% hide-ifdef-hiding (Start) ===
|
|
682
|
|
683
|
|
684 ;;; A range is a structure with four components:
|
|
685 ;;; ELSE-P True if there was an else clause for the ifdef.
|
|
686 ;;; START The start of the range. (beginning of line)
|
|
687 ;;; ELSE The else marker (beginning of line)
|
|
688 ;;; Only valid if ELSE-P is true.
|
|
689 ;;; END The end of the range. (beginning of line)
|
|
690
|
|
691 (defun hif-make-range (else-p start end &optional else)
|
|
692 (list else-p start else end))
|
|
693
|
|
694 (defun hif-range-else-p (range) (elt range 0))
|
|
695 (defun hif-range-start (range) (elt range 1))
|
|
696 (defun hif-range-else (range) (elt range 2))
|
|
697 (defun hif-range-end (range) (elt range 3))
|
|
698
|
|
699
|
|
700
|
|
701 ;;; Find-Range
|
|
702 ;;; The workhorse, it delimits the #if region. Reasonably simple:
|
|
703 ;;; Skip until an #else or #endif is found, remembering positions. If
|
|
704 ;;; an #else was found, skip some more, looking for the true #endif.
|
|
705
|
|
706 (defun hif-find-range ()
|
|
707 "Returns a Range structure describing the current #if region.
|
|
708 Point is left unchanged."
|
|
709 ; (message "hif-find-range at %d" (point))
|
|
710 (save-excursion
|
|
711 (beginning-of-line)
|
|
712 (let ((start (point))
|
|
713 (else-p nil)
|
|
714 (else nil)
|
|
715 (end nil))
|
|
716 ;; Part one. Look for either #endif or #else.
|
|
717 ;; This loop-and-a-half dedicated to E. Dijkstra.
|
|
718 (hif-find-next-relevant)
|
|
719 (while (hif-looking-at-ifX) ; Skip nested ifdef
|
|
720 (hif-ifdef-to-endif)
|
|
721 (hif-find-next-relevant))
|
|
722 ;; Found either a #else or an #endif.
|
|
723 (cond ((hif-looking-at-else)
|
|
724 (setq else-p t)
|
|
725 (setq else (point)))
|
|
726 (t
|
|
727 (setq end (point)) ; (save-excursion (end-of-line) (point))
|
|
728 ))
|
|
729 ;; If found #else, look for #endif.
|
|
730 (if else-p
|
|
731 (progn
|
|
732 (hif-find-next-relevant)
|
|
733 (while (hif-looking-at-ifX) ; Skip nested ifdef
|
|
734 (hif-ifdef-to-endif)
|
|
735 (hif-find-next-relevant))
|
|
736 (if (hif-looking-at-else)
|
|
737 (error "Found two elses in a row? Broken!"))
|
|
738 (setq end (point)) ; (save-excursion (end-of-line) (point))
|
|
739 ))
|
|
740 (hif-make-range else-p start end else))))
|
|
741
|
|
742
|
|
743 ;;; A bit slimy.
|
|
744 ;;; NOTE: If there's an #ifdef at the beginning of the file, we can't
|
|
745 ;;; hide it. There's no previous newline to replace. If we added
|
|
746 ;;; one, we'd throw off all the counts. Feh.
|
|
747
|
|
748 (defun hif-hide-line (point)
|
|
749 "Hide the line containing point. Does nothing if
|
|
750 hide-ifdef-lines is nil."
|
|
751 (if hide-ifdef-lines
|
|
752 (save-excursion
|
|
753 (goto-char point)
|
|
754 (let ((modp (buffer-modified-p)))
|
|
755 (unwind-protect
|
|
756 (progn
|
|
757 (beginning-of-line)
|
|
758 (if (not (= (point) 1))
|
|
759 (hide-ifdef-region (1- (point)) (point))))
|
|
760 (set-buffer-modified-p modp))
|
|
761 ))
|
|
762 ))
|
|
763
|
|
764
|
|
765 ;;; Hif-Possibly-Hide
|
|
766 ;;; There are four cases. The #ifX expression is "taken" if it
|
|
767 ;;; the hide-ifdef-evaluator returns T. Presumably, this means the code
|
|
768 ;;; inside the #ifdef would be included when the program was
|
|
769 ;;; compiled.
|
|
770 ;;;
|
|
771 ;;; Case 1: #ifX taken, and there's an #else.
|
|
772 ;;; The #else part must be hidden. The #if (then) part must be
|
|
773 ;;; processed for nested #ifX's.
|
|
774 ;;; Case 2: #ifX taken, and there's no #else.
|
|
775 ;;; The #if part must be processed for nested #ifX's.
|
|
776 ;;; Case 3: #ifX not taken, and there's an #else.
|
|
777 ;;; The #if part must be hidden. The #else part must be processed
|
|
778 ;;; for nested #ifs.
|
|
779 ;;; Case 4: #ifX not taken, and there's no #else.
|
|
780 ;;; The #ifX part must be hidden.
|
|
781 ;;;
|
|
782 ;;; Further processing is done by narrowing to the relevant region
|
|
783 ;;; and just recursively calling hide-ifdef-guts.
|
|
784 ;;;
|
|
785 ;;; When hif-possibly-hide returns, point is at the end of the
|
|
786 ;;; possibly-hidden range.
|
|
787
|
|
788 (defun hif-recurse-on (start end)
|
|
789 "Call hide-ifdef-guts after narrowing to end of START line and END
|
|
790 line."
|
|
791 (save-excursion
|
|
792 (save-restriction
|
|
793 (goto-char start)
|
|
794 (end-of-line)
|
|
795 (narrow-to-region (point) end)
|
|
796 (hide-ifdef-guts))))
|
|
797
|
|
798 (defun hif-possibly-hide ()
|
|
799 "Called at #ifX expression, this hides those parts that should be
|
|
800 hidden, according to judgement of hide-ifdef-evaluator."
|
|
801 ; (message "hif-possibly-hide") (sit-for 1)
|
|
802 (let ((test (hif-canonicalize))
|
|
803 (range (hif-find-range)))
|
|
804 ; (message "test = %s" test) (sit-for 1)
|
|
805
|
|
806 (hif-hide-line (hif-range-end range))
|
|
807 (if (funcall hide-ifdef-evaluator test)
|
|
808 (cond ((hif-range-else-p range) ; case 1
|
|
809 (hif-hide-line (hif-range-else range))
|
|
810 (hide-ifdef-region (hif-range-else range)
|
|
811 (1- (hif-range-end range)))
|
|
812 (hif-recurse-on (hif-range-start range)
|
|
813 (hif-range-else range)))
|
|
814 (t ; case 2
|
|
815 (hif-recurse-on (hif-range-start range)
|
|
816 (hif-range-end range))))
|
|
817 (cond ((hif-range-else-p range) ; case 3
|
|
818 (hif-hide-line (hif-range-else range))
|
|
819 (hide-ifdef-region (hif-range-start range)
|
|
820 (1- (hif-range-else range)))
|
|
821 (hif-recurse-on (hif-range-else range)
|
|
822 (hif-range-end range)))
|
|
823 (t ; case 4
|
|
824 (hide-ifdef-region (point)
|
|
825 (1- (hif-range-end range))))
|
|
826 ))
|
|
827 (hif-hide-line (hif-range-start range)) ; Always hide start.
|
|
828 (goto-char (hif-range-end range))
|
|
829 (end-of-line)
|
|
830 ))
|
|
831
|
|
832
|
|
833
|
|
834 (defun hide-ifdef-guts ()
|
|
835 "Does the work of hide-ifdefs, except for the work that's pointless
|
|
836 to redo on a recursive entry."
|
|
837 ; (message "hide-ifdef-guts")
|
|
838 (save-excursion
|
|
839 (goto-char (point-min))
|
|
840 (while (hif-find-any-ifX)
|
|
841 (hif-possibly-hide))))
|
|
842
|
|
843 ;===%%SF%% hide-ifdef-hiding (End) ===
|
|
844
|
|
845
|
|
846 ;===%%SF%% exports (Start) ===
|
|
847
|
|
848 (defvar hide-ifdef-initially nil
|
|
849 "*Non-nil if hide-ifdefs should be called when hide-ifdef-mode
|
|
850 is first activated.")
|
|
851
|
|
852 (defvar hide-ifdef-hiding nil
|
|
853 "Non-nil if text might be hidden.")
|
|
854
|
|
855 (defvar hide-ifdef-read-only nil
|
|
856 "*Set to non-nil if you want buffer to be read-only while hiding text.")
|
|
857
|
|
858 (defvar hif-outside-read-only nil
|
|
859 "Internal variable. Saves the value of buffer-read-only while hiding.")
|
|
860
|
|
861 (defvar hide-ifdef-lines nil
|
|
862 "*Set to t if you don't want to see the #ifX, #else, and #endif lines.")
|
|
863
|
|
864 (defun hide-ifdef-toggle-read-only ()
|
|
865 "Toggle hide-ifdef-read-only."
|
|
866 (interactive)
|
|
867 (setq hide-ifdef-read-only (not hide-ifdef-read-only))
|
|
868 (message "Hide-Read-Only %s"
|
|
869 (if hide-ifdef-read-only "ON" "OFF"))
|
|
870 (if hide-ifdef-hiding
|
|
871 (setq buffer-read-only (or hide-ifdef-read-only hif-outside-read-only)))
|
|
872 (hif-update-mode-line)
|
|
873 )
|
|
874
|
|
875 (defun hide-ifdef-toggle-outside-read-only ()
|
|
876 "Replacement for toggle-read-only within hide-ifdef-mode."
|
|
877 (interactive)
|
|
878 (setq hif-outside-read-only (not hif-outside-read-only))
|
|
879 (message "Read only %s"
|
|
880 (if hif-outside-read-only "ON" "OFF"))
|
|
881 (setq buffer-read-only
|
|
882 (or (and hide-ifdef-hiding hide-ifdef-read-only)
|
|
883 hif-outside-read-only)
|
|
884 )
|
|
885 (hif-update-mode-line)
|
|
886 )
|
|
887
|
|
888
|
|
889 (defun hide-ifdef-define (var)
|
|
890 "Define a VAR so that #ifdef VAR would be included."
|
|
891 (interactive "SDefine what? ")
|
|
892 (hif-set-var var t)
|
|
893 (if hide-ifdef-hiding (hide-ifdefs)))
|
|
894
|
|
895 (defun hide-ifdef-undef (var)
|
|
896 "Undefine a VAR so that #ifdef VAR would not be included."
|
|
897 (interactive "SUndefine what? ")
|
|
898 (hif-set-var var nil)
|
|
899 (if hide-ifdef-hiding (hide-ifdefs)))
|
|
900
|
|
901
|
|
902 (defun hide-ifdefs ()
|
|
903 "Hide the contents of some #ifdefs. Assume that defined symbols have
|
|
904 been added to hide-ifdef-env. The text hidden is the text that would not
|
|
905 be included by the C preprocessor if it were given the file with those
|
|
906 symbols defined.
|
|
907
|
|
908 Turn off hiding by calling show-ifdef."
|
|
909
|
|
910 (interactive)
|
|
911 (message "Hiding...")
|
|
912 (if (not hide-ifdef-mode)
|
|
913 (hide-ifdef-mode 1)) ; turn on hide-ifdef-mode
|
|
914 (if hide-ifdef-hiding
|
|
915 (show-ifdefs)) ; Otherwise, deep confusion.
|
|
916 (if buffer-read-only (toggle-read-only)) ; make it writable temporarily
|
|
917 (setq selective-display t)
|
|
918 (setq hide-ifdef-hiding t)
|
|
919 (hide-ifdef-guts)
|
|
920 (if (or hide-ifdef-read-only hif-outside-read-only)
|
|
921 (toggle-read-only) ; make it read only
|
|
922 )
|
|
923 (message "Hiding done")
|
|
924 )
|
|
925
|
|
926
|
|
927 (defun show-ifdefs ()
|
|
928 "Cancel the effects of hide-ifdef. The contents of all #ifdefs is shown."
|
|
929 (interactive)
|
|
930 (if buffer-read-only (toggle-read-only)) ; make it writable temporarily
|
|
931 (setq selective-display nil) ; defaults
|
|
932 (hif-show-all)
|
|
933 (if hif-outside-read-only
|
|
934 (toggle-read-only)) ; make it read only
|
|
935 (setq hide-ifdef-hiding nil)
|
|
936 )
|
|
937
|
|
938
|
|
939 (defun hif-find-ifdef-block ()
|
|
940 "Utilitiy for hide and show ifdef-block. Set top and bottom of ifdef block."
|
|
941 (let (max-bottom)
|
|
942 (save-excursion
|
|
943 (beginning-of-line)
|
|
944 (if (not (or (hif-looking-at-else) (hif-looking-at-ifX)))
|
|
945 (up-ifdef))
|
|
946 (setq top (point))
|
|
947 (hif-ifdef-to-endif)
|
|
948 (setq max-bottom (1- (point)))
|
|
949 )
|
|
950 (save-excursion
|
|
951 (beginning-of-line)
|
|
952 (if (not (hif-looking-at-endif))
|
|
953 (hif-find-next-relevant))
|
|
954 (while (hif-looking-at-ifX)
|
|
955 (hif-ifdef-to-endif)
|
|
956 (hif-find-next-relevant)
|
|
957 )
|
|
958 (setq bottom (min max-bottom (1- (point))))
|
|
959 ))
|
|
960 )
|
|
961
|
|
962
|
|
963 (defun hide-ifdef-block ()
|
|
964 "Hide the ifdef block (true or false part) enclosing or before the cursor."
|
|
965 (interactive)
|
|
966 (if (not hide-ifdef-mode)
|
|
967 (hide-ifdef-mode 1))
|
|
968 (if buffer-read-only (toggle-read-only))
|
|
969 (setq selective-display t)
|
|
970 (let (top bottom)
|
|
971 (hif-find-ifdef-block) ; set top and bottom - dynamic scoping
|
|
972 (hide-ifdef-region top bottom)
|
|
973 (if hide-ifdef-lines
|
|
974 (progn
|
|
975 (hif-hide-line top)
|
|
976 (hif-hide-line (1+ bottom))))
|
|
977 (setq hide-ifdef-hiding t)
|
|
978 )
|
|
979 (if (or hide-ifdef-read-only hif-outside-read-only)
|
|
980 (toggle-read-only))
|
|
981 )
|
|
982
|
|
983
|
|
984 (defun show-ifdef-block ()
|
|
985 "Show the ifdef block (true or false part) enclosing or before the cursor."
|
|
986 (interactive)
|
|
987 (let ((old-read-only buffer-read-only))
|
|
988 (if old-read-only (toggle-read-only))
|
|
989 (if hide-ifdef-lines
|
|
990 (save-excursion
|
|
991 (beginning-of-line)
|
|
992 (hif-show-ifdef-region (1- (point)) (progn (end-of-line) (point))))
|
|
993
|
|
994 (let (top bottom)
|
|
995 (hif-find-ifdef-block)
|
|
996 (hif-show-ifdef-region (1- top) bottom))
|
|
997 )
|
|
998
|
|
999 ; restore read only status since we dont know if all is shown.
|
|
1000 (if old-read-only (toggle-read-only))
|
|
1001 ))
|
|
1002
|
|
1003
|
|
1004
|
|
1005 ;;; defininition alist support
|
|
1006
|
|
1007 (defvar hide-ifdef-define-alist nil
|
|
1008 "A global assoc list of pre-defined symbol lists")
|
|
1009
|
|
1010 (defun hif-compress-define-list (env)
|
|
1011 "Compress the define list ENV into a list of defined symbols only."
|
|
1012 (let ((defs (mapcar '(lambda (arg)
|
|
1013 (if (hif-lookup (car arg)) (car arg)))
|
|
1014 env))
|
|
1015 (new-defs nil))
|
|
1016 (while defs
|
|
1017 (if (car defs)
|
|
1018 (setq new-defs (cons (car defs) new-defs)))
|
|
1019 (setq defs (cdr defs)))
|
|
1020 new-defs
|
|
1021 ))
|
|
1022
|
|
1023 (defun hide-ifdef-set-define-alist (name)
|
|
1024 "Set the association for NAME to hide-ifdef-env."
|
|
1025 (interactive "SSet define list: ")
|
|
1026 (setq hide-ifdef-define-alist
|
|
1027 (cons (cons name (hif-compress-define-list hide-ifdef-env))
|
|
1028 hide-ifdef-define-alist))
|
|
1029 )
|
|
1030
|
|
1031 (defun hide-ifdef-use-define-alist (name)
|
|
1032 "Set hide-ifdef-env to the define list specified by NAME."
|
|
1033 (interactive "SUse define list: ")
|
|
1034 (let ((define-list (assoc name hide-ifdef-define-alist)))
|
|
1035 (if define-list
|
|
1036 (setq hide-ifdef-env
|
|
1037 (mapcar '(lambda (arg) (cons arg t))
|
|
1038 (cdr define-list)))
|
|
1039 (error "No define list for %s" name))
|
|
1040 (if hide-ifdef-hiding (hide-ifdefs))
|
|
1041 )
|
|
1042 )
|
|
1043
|
|
1044 ;===%%SF%% exports (End) ===
|