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1 | ;;; cc-compat.el --- cc-mode compatibility with c-mode.el confusion |
2 | ||
3 | ;; Copyright (C) 1985,87,92,93,94,95,96,97 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: 1994-1997 Barry A. Warsaw | |
6 | ;; Maintainer: cc-mode-help@python.org | |
7 | ;; Created: August 1994, split from cc-mode.el | |
81eb2ff9 | 8 | ;; Version: See cc-mode.el |
785eecbb RS |
9 | ;; Keywords: c languages oop |
10 | ||
11 | ;; This file is part of GNU Emacs. | |
12 | ||
13 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
14 | ;; it under the terms of the GNU General Public License as published by | |
15 | ;; the Free Software Foundation; either version 2, or (at your option) | |
16 | ;; any later version. | |
17 | ||
18 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
19 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | ;; GNU General Public License for more details. | |
22 | ||
23 | ;; You should have received a copy of the GNU General Public License | |
24 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
25 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
26 | ;; Boston, MA 02111-1307, USA. | |
27 | ||
28 | ;;; Commentary: | |
29 | ;; | |
30 | ;; Boring old c-mode.el (BOCM) is confusion and brain melt. cc-mode.el | |
31 | ;; is clarity of thought and purity of chi. If you are still unwilling | |
32 | ;; to accept enlightenment, this might help, or it may prolong your | |
33 | ;; agony. | |
34 | ;; | |
35 | ;; To use, add the following to your c-mode-hook: | |
36 | ;; | |
37 | ;; (require 'cc-compat) | |
38 | ;; (c-set-style "BOCM") | |
39 | ||
40 | ;;; Code: | |
41 | ||
42 | (eval-when-compile | |
43 | (require 'cc-styles) | |
44 | (require 'cc-engine)) | |
45 | ||
46 | \f | |
47 | ;; In case c-mode.el isn't loaded | |
48 | (defvar c-indent-level 2 | |
49 | "*Indentation of C statements with respect to containing block.") | |
50 | (defvar c-brace-imaginary-offset 0 | |
51 | "*Imagined indentation of a C open brace that actually follows a statement.") | |
52 | (defvar c-brace-offset 0 | |
53 | "*Extra indentation for braces, compared with other text in same context.") | |
54 | (defvar c-argdecl-indent 5 | |
55 | "*Indentation level of declarations of C function arguments.") | |
56 | (defvar c-label-offset -2 | |
57 | "*Offset of C label lines and case statements relative to usual indentation.") | |
58 | (defvar c-continued-statement-offset 2 | |
59 | "*Extra indent for lines not starting new statements.") | |
60 | (defvar c-continued-brace-offset 0 | |
61 | "*Extra indent for substatements that start with open-braces. | |
62 | This is in addition to c-continued-statement-offset.") | |
63 | ||
64 | ||
65 | \f | |
66 | ;; these offsets are taken by brute force testing c-mode.el, since | |
67 | ;; there's no logic to what it does. | |
68 | (let* ((offsets '(c-offsets-alist . | |
69 | ((defun-block-intro . cc-block-intro-offset) | |
70 | (statement-block-intro . cc-block-intro-offset) | |
71 | (defun-open . 0) | |
72 | (class-open . 0) | |
73 | (inline-open . c-brace-offset) | |
74 | (block-open . c-brace-offset) | |
75 | (block-close . cc-block-close-offset) | |
76 | (brace-list-open . c-brace-offset) | |
77 | (substatement-open . cc-substatement-open-offset) | |
78 | (substatement . c-continued-statement-offset) | |
79 | (knr-argdecl-intro . c-argdecl-indent) | |
80 | (case-label . c-label-offset) | |
81 | (access-label . c-label-offset) | |
82 | (label . c-label-offset) | |
83 | )))) | |
84 | (c-add-style "BOCM" offsets)) | |
85 | ||
86 | ||
87 | (defun cc-block-intro-offset (langelem) | |
88 | ;; taken directly from calculate-c-indent confusion | |
89 | (save-excursion | |
90 | (c-backward-syntactic-ws) | |
91 | (if (eq (char-before) ?{) | |
92 | (forward-char -1) | |
93 | (goto-char (cdr langelem))) | |
94 | (let* ((curcol (save-excursion | |
95 | (goto-char (cdr langelem)) | |
96 | (current-column))) | |
97 | (bocm-lossage | |
98 | ;; If no previous statement, indent it relative to line | |
99 | ;; brace is on. For open brace in column zero, don't let | |
100 | ;; statement start there too. If c-indent-level is zero, | |
101 | ;; use c-brace-offset + c-continued-statement-offset | |
102 | ;; instead. For open-braces not the first thing in a line, | |
103 | ;; add in c-brace-imaginary-offset. | |
104 | (+ (if (and (bolp) (zerop c-indent-level)) | |
105 | (+ c-brace-offset c-continued-statement-offset) | |
106 | c-indent-level) | |
107 | ;; Move back over whitespace before the openbrace. If | |
108 | ;; openbrace is not first nonwhite thing on the line, | |
109 | ;; add the c-brace-imaginary-offset. | |
110 | (progn (skip-chars-backward " \t") | |
111 | (if (bolp) 0 c-brace-imaginary-offset)) | |
112 | ;; If the openbrace is preceded by a parenthesized exp, | |
113 | ;; move to the beginning of that; possibly a different | |
114 | ;; line | |
115 | (progn | |
116 | (if (eq (char-before) ?\)) | |
117 | (forward-sexp -1)) | |
118 | ;; Get initial indentation of the line we are on. | |
119 | (current-indentation))))) | |
120 | (- bocm-lossage curcol)))) | |
121 | ||
122 | ||
123 | (defun cc-block-close-offset (langelem) | |
124 | (save-excursion | |
125 | (let* ((here (point)) | |
126 | bracep | |
127 | (curcol (progn | |
128 | (goto-char (cdr langelem)) | |
129 | (current-column))) | |
130 | (bocm-lossage (progn | |
131 | (goto-char (cdr langelem)) | |
132 | (if (eq (char-after) ?{) | |
133 | (setq bracep t) | |
134 | (goto-char here) | |
135 | (beginning-of-line) | |
136 | (backward-up-list 1) | |
137 | (forward-char 1) | |
138 | (c-forward-syntactic-ws)) | |
139 | (current-column)))) | |
140 | (- bocm-lossage curcol | |
141 | (if bracep 0 c-indent-level))))) | |
142 | ||
143 | ||
144 | (defun cc-substatement-open-offset (langelem) | |
145 | (+ c-continued-statement-offset c-continued-brace-offset)) | |
146 | ||
147 | \f | |
148 | (provide 'cc-compat) | |
149 | ;;; cc-compat.el ends here |