summaryrefslogtreecommitdiff
path: root/lisp/progmodes/cc-compat.el
blob: 42ab5e8f032c951c0f7400818fb332a222d91b5d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
;;; cc-compat.el --- cc-mode compatibility with c-mode.el confusion

;; Copyright (C) 1985, 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
;;   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
;;   Free Software Foundation, Inc.

;; Authors:    1998- Martin Stjernholm
;;	       1994-1999 Barry A. Warsaw
;; Maintainer: bug-cc-mode@gnu.org
;; Created:    August 1994, split from cc-mode.el
;; Version:    See cc-mode.el
;; Keywords:   c languages oop

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:
;;
;; Boring old c-mode.el (BOCM) is confusion and brain melt. cc-mode.el
;; is clarity of thought and purity of chi. If you are still unwilling
;; to accept enlightenment, this might help, or it may prolong your
;; agony.
;;
;; To use, add the following to your c-mode-hook:
;;
;; (require 'cc-compat)
;; (c-set-style "BOCM")
;;
;; This file is completely unsupported!  Although it has been patched
;; superficially to keep pace with the rest of CC Mode, it hasn't been
;; tested for a long time.

;;; Code:

(eval-when-compile
  (let ((load-path
	 (if (and (boundp 'byte-compile-dest-file)
		  (stringp byte-compile-dest-file))
	     (cons (file-name-directory byte-compile-dest-file) load-path)
	   load-path)))
    (load "cc-bytecomp" nil t)))

(cc-require 'cc-defs)
(cc-require 'cc-vars)
(cc-require 'cc-styles)
(cc-require 'cc-engine)


;; In case c-mode.el isn't loaded
(defvar c-indent-level 2
  "*Indentation of C statements with respect to containing block.")
;;;###autoload(put 'c-indent-level 'safe-local-variable 'integerp)

(defvar c-brace-imaginary-offset 0
  "*Imagined indentation of a C open brace that actually follows a statement.")
(defvar c-brace-offset 0
  "*Extra indentation for braces, compared with other text in same context.")
(defvar c-argdecl-indent 5
  "*Indentation level of declarations of C function arguments.")
(defvar c-label-offset -2
  "*Offset of C label lines and case statements relative to usual indentation.")
(defvar c-continued-statement-offset 2
  "*Extra indent for lines not starting new statements.")
(defvar c-continued-brace-offset 0
  "*Extra indent for substatements that start with open-braces.
This is in addition to c-continued-statement-offset.")



;; these offsets are taken by brute force testing c-mode.el, since
;; there's no logic to what it does.
(let* ((offsets	'(c-offsets-alist .
		    ((defun-block-intro     . cc-block-intro-offset)
		     (statement-block-intro . cc-block-intro-offset)
		     (defun-open            . 0)
		     (class-open            . 0)
		     (inline-open           . c-brace-offset)
		     (block-open            . c-brace-offset)
		     (block-close           . cc-block-close-offset)
		     (brace-list-open       . c-brace-offset)
		     (substatement-open     . cc-substatement-open-offset)
		     (substatement          . c-continued-statement-offset)
		     (knr-argdecl-intro     . c-argdecl-indent)
		     (case-label            . c-label-offset)
		     (access-label          . c-label-offset)
		     (label                 . c-label-offset)
		     ))))
  (c-add-style "BOCM" offsets))


(defun cc-block-intro-offset (langelem)
  ;; taken directly from calculate-c-indent confusion
  (save-excursion
    (c-backward-syntactic-ws)
    (if (eq (char-before) ?{)
	(forward-char -1)
      (goto-char (cdr langelem)))
    (let* ((curcol (save-excursion 
		     (goto-char (cdr langelem))
		     (current-column)))
	  (bocm-lossage
	   ;; If no previous statement, indent it relative to line
	   ;; brace is on.  For open brace in column zero, don't let
	   ;; statement start there too.  If c-indent-level is zero,
	   ;; use c-brace-offset + c-continued-statement-offset
	   ;; instead.  For open-braces not the first thing in a line,
	   ;; add in c-brace-imaginary-offset.
	   (+ (if (and (bolp) (zerop c-indent-level))
		  (+ c-brace-offset c-continued-statement-offset)
		c-indent-level)
	      ;; Move back over whitespace before the openbrace.  If
	      ;; openbrace is not first nonwhite thing on the line,
	      ;; add the c-brace-imaginary-offset.
	      (progn (skip-chars-backward " \t")
		     (if (bolp) 0 c-brace-imaginary-offset))
	      ;; If the openbrace is preceded by a parenthesized exp,
	      ;; move to the beginning of that; possibly a different
	      ;; line
	      (progn
		(if (eq (char-before) ?\))
		    (c-forward-sexp -1))
		;; Get initial indentation of the line we are on.
		(current-indentation)))))
      (- bocm-lossage curcol))))


(defun cc-block-close-offset (langelem)
  (save-excursion
    (let* ((here (point))
	   bracep 
	   (curcol (progn
		     (goto-char (cdr langelem))
		     (current-column)))
	   (bocm-lossage (progn
			   (goto-char (cdr langelem))
			   (if (eq (char-after) ?{)
			       (setq bracep t)
			     (goto-char here)
			     (beginning-of-line)
			     (backward-up-list 1)
			     (forward-char 1)
			     (c-forward-syntactic-ws))
			   (current-column))))
      (- bocm-lossage curcol
	 (if bracep 0 c-indent-level)))))
      

(defun cc-substatement-open-offset (langelem)
  (+ c-continued-statement-offset c-continued-brace-offset))


(cc-provide 'cc-compat)

;; arch-tag: 564dab2f-e6ad-499c-a4a3-fedec3ecc192
;;; cc-compat.el ends here