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1 ;;; cc-lobotomy.el --- excise portions of cc-mode's brain... for speed
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2
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3 ;; Copyright (C) 1985-1995 Free Software Foundation, Inc.
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4
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5 ;; Author: 1995 Barry A. Warsaw
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6 ;; Maintainer: cc-mode-help@merlin.cnri.reston.va.us
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7 ;; Created: March 1995, split from cc-mode.el
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8 ;; Version: 1.8
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9 ;; Last Modified: 1995/06/11 21:42:31
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10 ;; Keywords: c languages oop
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11
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12 ;; This file is not part of GNU Emacs.
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13
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14 ;; This program is free software; you can redistribute it and/or modify
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15 ;; it under the terms of the GNU General Public License as published by
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16 ;; the Free Software Foundation; either version 2 of the License, or
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17 ;; (at your option) any later version.
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18 ;;
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19 ;; This program is distributed in the hope that it will be useful,
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20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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22 ;; GNU General Public License for more details.
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23 ;;
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24 ;; You should have received a copy of the GNU General Public License
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25 ;; along with this program; if not, write to the Free Software
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26 ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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27
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28 ;;; Synched up with: Not in FSF.
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29
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30 ;;; Commentary:
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31 ;;
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32 ;; Every effort has been made to improve the performance of
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33 ;; cc-mode. However, due to the nature of the C, C++, and Objective-C
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34 ;; language definitions, a trade-off is often required between
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35 ;; accuracy of construct recognition and speed. I believe it is always
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36 ;; best to be correct, and that the mode is currently fast enough for
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37 ;; most normal usage. Others disagree. I have no intention of
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38 ;; including these hacks in the main distribution. When cc-mode
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39 ;; version 5 comes out, it will include a rewritten indentation engine
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40 ;; so that performance will be greatly improved automatically. This
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41 ;; was not included in this release of version 4 so that Emacs 18
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42 ;; could still be supported. Note that this implies that cc-mode
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43 ;; version 5 will *not* work on Emacs 18!
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44 ;;
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45 ;; To use, see the variable cc-lobotomy-pith-list and the function
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46 ;; cc-lobotomize. The variable contains a good explanation of the
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47 ;; speed/accuracy trade-offs for each option. Set it to what you'd
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48 ;; like, and call cc-lobotomy in your c-mode-hook.
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49 ;;
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50 ;; This will redefine certain cc-mode functions and affect all cc-mode
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51 ;; buffers globally.
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52 ;;
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53 ;; This file is completely unsupported! I have no idea whether this
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54 ;; will work with such things as cc-mode-18.el.
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55
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56
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57 ;;; Code:
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58 (require 'cc-mode)
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59
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60 (defvar cc-lobotomy-pith-list ()
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61 "*List of things to dumb-ify to speed up cc-mode. Note that each
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62 incurs a penalty in correct identification of certain code constructs.
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63 Possible values to put on this list:
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64
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65 'literal -- `c-in-literal' is lobotomized. This will significantly
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66 speed up parsing over large lists of cpp macros, as seen
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67 for instance in header files. The penalty is that you
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68 cannot put the `#' character as the first non-whitespace
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69 character on a line inside other multi-line literals
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70 (i.e. comments or strings)
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71
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72 'class -- `c-narrow-out-enclosing-class' and `c-search-uplist for
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73 classkey' are lobotomized. This speeds up some
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74 indenting inside and around class and struct
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75 definitions. The penalty is that elements inside of
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76 classes and structs may not indent correctly.
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77
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78 'lists -- `c-inside-bracelist-p' is lobotomized. This speeds up
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79 indenting inside and around brace lists (e.g. aggregate
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80 initializers, enum lists, etc.). The penalty is that
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81 elements inside these lists may not indent correctly.")
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82
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83 (defun cc-lobotomize ()
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84 "Perform lobotomies on cc-mode as described in `cc-lobotomy-pith-list'."
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85 (let (pithedp)
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86 (if (memq 'literal cc-lobotomy-pith-list)
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87 (progn
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88 (fset 'c-in-literal 'cc-in-literal-lobotomized)
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89 (setq pithedp t)))
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90 (if (memq 'class cc-lobotomy-pith-list)
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91 (progn
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92 (fset 'c-narrow-out-enclosing-class
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93 'cc-narrow-out-enclosing-class-lobotomized)
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94 (fset 'c-search-uplist-for-classkey
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95 'cc-search-uplist-for-classkey-lobotomized)
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96 (setq pithedp t)))
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97 (if (memq 'lists cc-lobotomy-pith-list)
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98 (progn
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99 (fset 'c-inside-bracelist-p 'cc-inside-bracelist-p-lobotomized)
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100 (setq pithedp t)))
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101 (if pithedp
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102 (fset 'c-submit-bug-report 'cc-submit-bug-report-lobotomized))
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103 ))
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104
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105
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106 ;; This is a faster version of c-in-literal. It trades speed for one
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107 ;; approximation, namely that within other literals, the `#' character
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108 ;; cannot be the first non-whitespace on a line.
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109 (defun cc-in-literal-lobotomized (&optional lim)
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110 ;; first check the cache
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111 (if (and (boundp 'c-in-literal-cache)
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112 c-in-literal-cache
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113 (= (point) (aref c-in-literal-cache 0)))
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114 (aref c-in-literal-cache 1)
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115 ;; quickly check for cpp macro. this breaks if the `#' character
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116 ;; appears as the first non-whitespace on a line inside another
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117 ;; literal.
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118 (let* (state
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119 (char-at-boi (char-after (c-point 'boi)))
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120 (rtn (cond
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121 ((and char-at-boi (= char-at-boi ?#))
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122 'pound)
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123 ((nth 3 (setq state (save-excursion
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124 (parse-partial-sexp
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125 (or lim (c-point 'bod))
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126 (point)))))
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127 'string)
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128 ((nth 4 state) (if (nth 7 state) 'c++ 'c))
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129 (t nil))))
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130 ;; cache this result if the cache is enabled
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131 (and (boundp 'c-in-literal-cache)
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132 (setq c-in-literal-cache (vector (point) rtn)))
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133 rtn)))
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134
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135 (defun cc-narrow-out-enclosing-class-lobotomized (dummy1 dummy2) nil)
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136
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137 (defun cc-search-uplist-for-classkey-lobotomized (dummy) nil)
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138
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139 (defun cc-inside-bracelist-p-lobotomized (dummy1 dummy2) nil)
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140
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141 (defun cc-submit-bug-report-lobotomized ()
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142 "Submit via mail a bug report on cc-mode."
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143 (interactive)
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144 ;; load in reporter
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145 (let ((reporter-prompt-for-summary-p t)
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146 (reporter-dont-compact-list '(c-offsets-alist)))
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147 (and
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148 (y-or-n-p "Do you want to submit a report on cc-mode? ")
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149 (require 'reporter)
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150 (reporter-submit-bug-report
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151 c-mode-help-address
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152 (concat "cc-mode " c-version " ("
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153 (cond ((eq major-mode 'c++-mode) "C++")
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154 ((eq major-mode 'c-mode) "C")
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155 ((eq major-mode 'objc-mode) "ObjC"))
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156 ")")
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157 (let ((vars (list
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158 ;; report only the vars that affect indentation
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159 'c-basic-offset
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160 'c-offsets-alist
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161 'c-block-comments-indent-p
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162 'c-cleanup-list
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163 'c-comment-only-line-offset
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164 'c-backslash-column
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165 'c-delete-function
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166 'c-electric-pound-behavior
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167 'c-hanging-braces-alist
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168 'c-hanging-colons-alist
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169 'c-hanging-comment-ender-p
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170 'c-tab-always-indent
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171 'c-recognize-knr-p
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172 'defun-prompt-regexp
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173 'tab-width
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174 )))
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175 (if (not (boundp 'defun-prompt-regexp))
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176 (delq 'defun-prompt-regexp vars)
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177 vars))
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178 (function
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179 (lambda ()
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180 (insert
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181 (if c-special-indent-hook
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182 (concat "\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n"
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183 "c-special-indent-hook is set to '"
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184 (format "%s" c-special-indent-hook)
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185 ".\nPerhaps this is your problem?\n"
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186 "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n\n")
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187 "\n")
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188 (format "c-emacs-features: %s\n" c-emacs-features)
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189 )))
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190 (function
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191 (lambda ()
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192 (insert
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193 "You are using cc-lobotomy.el. You realize that by doing\n"
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194 "so you have already made the decision to trade off accuracy\n"
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195 "for speed? Don't set your hopes too high that your problem\n"
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196 "will be fixed.\n\n"
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197 )))
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198 "Dear Barry,"
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199 ))))
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200
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201 (provide 'cc-lobotomy)
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202 ;;; cc-lobotomy.el ends here
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