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1 ;;; cc-compat.el --- cc-mode compatibility with c-mode.el confusion
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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: 1994-1995 Barry A. Warsaw
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6 ;; Maintainer: cc-mode-help@merlin.cnri.reston.va.us
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7 ;; Created: August 1994, split from cc-mode.el
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8 ;; Version: 1.5
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9 ;; Last Modified: 1995/06/11 20:15:44
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10 ;; Keywords: c languages oop
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11
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12 ;; This file is part of GNU Emacs.
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13
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14 ;; GNU Emacs 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, or (at your option)
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17 ;; any later version.
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18
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19 ;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
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26 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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27
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28 ;;; Commentary:
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29 ;;
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30 ;; Boring old c-mode.el (BOCM) is confusion and brain melt. cc-mode.el
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31 ;; is clarity of thought and purity of chi. If you are still unwilling
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32 ;; to accept enlightenment, this might help, or it may prolong your
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33 ;; agony.
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34 ;;
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35 ;; To use, add the following to your c-mode-hook:
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36 ;;
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37 ;; (require 'cc-compat)
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38 ;; (c-set-style "BOCM")
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39
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40 ;;; Code:
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41
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42
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43 ;; In case c-mode.el isn't loaded
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44 (defvar c-indent-level 2
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45 "*Indentation of C statements with respect to containing block.")
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46 (defvar c-brace-imaginary-offset 0
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47 "*Imagined indentation of a C open brace that actually follows a statement.")
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48 (defvar c-brace-offset 0
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49 "*Extra indentation for braces, compared with other text in same context.")
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50 (defvar c-argdecl-indent 5
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51 "*Indentation level of declarations of C function arguments.")
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52 (defvar c-label-offset -2
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53 "*Offset of C label lines and case statements relative to usual indentation.")
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54 (defvar c-continued-statement-offset 2
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55 "*Extra indent for lines not starting new statements.")
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56 (defvar c-continued-brace-offset 0
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57 "*Extra indent for substatements that start with open-braces.
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58 This is in addition to c-continued-statement-offset.")
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59
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60
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61
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62 ;; these offsets are taken by brute force testing c-mode.el, since
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63 ;; there's no logic to what it does.
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64 (let* ((offsets '(c-offsets-alist .
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65 ((defun-block-intro . cc-block-intro-offset)
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66 (statement-block-intro . cc-block-intro-offset)
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67 (defun-open . 0)
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68 (class-open . 0)
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69 (inline-open . c-brace-offset)
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70 (block-open . c-brace-offset)
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71 (block-close . cc-block-close-offset)
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72 (brace-list-open . c-brace-offset)
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73 (substatement-open . cc-substatement-open-offset)
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74 (substatement . c-continued-statement-offset)
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75 (knr-argdecl-intro . c-argdecl-indent)
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76 (case-label . c-label-offset)
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77 (access-label . c-label-offset)
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78 (label . c-label-offset)
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79 ))))
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80 (c-add-style "BOCM" offsets))
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81
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82
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83 (defun cc-block-intro-offset (langelem)
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84 ;; taken directly from calculate-c-indent confusion
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85 (save-excursion
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86 (c-backward-syntactic-ws)
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87 (if (= (preceding-char) ?{)
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88 (forward-char -1)
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89 (goto-char (cdr langelem)))
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90 (let* ((curcol (save-excursion
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91 (goto-char (cdr langelem))
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92 (current-column)))
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93 (bocm-lossage
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94 ;; If no previous statement, indent it relative to line
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95 ;; brace is on. For open brace in column zero, don't let
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96 ;; statement start there too. If c-indent-level is zero,
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97 ;; use c-brace-offset + c-continued-statement-offset
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98 ;; instead. For open-braces not the first thing in a line,
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99 ;; add in c-brace-imaginary-offset.
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100 (+ (if (and (bolp) (zerop c-indent-level))
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101 (+ c-brace-offset c-continued-statement-offset)
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102 c-indent-level)
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103 ;; Move back over whitespace before the openbrace. If
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104 ;; openbrace is not first nonwhite thing on the line,
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105 ;; add the c-brace-imaginary-offset.
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106 (progn (skip-chars-backward " \t")
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107 (if (bolp) 0 c-brace-imaginary-offset))
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108 ;; If the openbrace is preceded by a parenthesized exp,
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109 ;; move to the beginning of that; possibly a different
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110 ;; line
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111 (progn
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112 (if (eq (preceding-char) ?\))
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113 (forward-sexp -1))
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114 ;; Get initial indentation of the line we are on.
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115 (current-indentation)))))
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116 (- bocm-lossage curcol))))
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117
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118
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119 (defun cc-block-close-offset (langelem)
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120 (save-excursion
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121 (let* ((here (point))
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122 bracep
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123 (curcol (progn
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124 (goto-char (cdr langelem))
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125 (current-column)))
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126 (bocm-lossage (progn
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127 (goto-char (cdr langelem))
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128 (if (= (following-char) ?{)
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129 (setq bracep t)
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130 (goto-char here)
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131 (beginning-of-line)
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132 (backward-up-list 1)
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133 (forward-char 1)
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134 (c-forward-syntactic-ws))
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135 (current-column))))
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136 (- bocm-lossage curcol
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137 (if bracep 0 c-indent-level)))))
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138
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139
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140 (defun cc-substatement-open-offset (langelem)
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141 (+ c-continued-statement-offset c-continued-brace-offset))
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142
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143
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144 (provide 'cc-compat)
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145 ;;; cc-compat.el ends here
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