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comparison lisp/cc-mode/cc-compat.el @ 165:5a88923fcbfe r20-3b9

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Import from CVS: tag r20-3b9
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date Mon, 13 Aug 2007 09:44:42 +0200
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164:4e0740e5aab2 165:5a88923fcbfe
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
8 ;; Version: 5.11
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 (load-file "./cc-styles.el")
44 (load-file "./cc-engine.el"))
45
46
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
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 (= (preceding-char) ?{)
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 (preceding-char) ?\))
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 (= (following-char) ?{)
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
148 (provide 'cc-compat)
149 ;;; cc-compat.el ends here