lisp/progmodes/cc-compat.el

   1 ;;; cc-compat.el --- cc-mode compatibility with c-mode.el confusion
   2
   3 ;; Copyright (C) 1985, 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   4 ;;   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   5 ;;   Free Software Foundation, Inc.
   6
   7 ;; Authors:    1998- Martin Stjernholm
   8 ;;             1994-1999 Barry A. Warsaw
   9 ;; Maintainer: bug-cc-mode@gnu.org
  10 ;; Created:    August 1994, split from cc-mode.el
  11 ;; Keywords:   c languages
  12 ;; Package:    cc-mode
  13
  14 ;; This file is part of GNU Emacs.
  15
  16 ;; GNU Emacs is free software: you can redistribute it and/or modify
  17 ;; it under the terms of the GNU General Public License as published by
  18 ;; the Free Software Foundation, either version 3 of the License, or
  19 ;; (at your option) any later version.
  20
  21 ;; GNU Emacs is distributed in the hope that it will be useful,
  22 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 ;; GNU General Public License for more details.
  25
  26 ;; You should have received a copy of the GNU General Public License
  27 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  28
  29 ;;; Commentary:
  30 ;;
  31 ;; Boring old c-mode.el (BOCM) is confusion and brain melt. cc-mode.el
  32 ;; is clarity of thought and purity of chi. If you are still unwilling
  33 ;; to accept enlightenment, this might help, or it may prolong your
  34 ;; agony.
  35 ;;
  36 ;; To use, add the following to your c-mode-hook:
  37 ;;
  38 ;; (require 'cc-compat)
  39 ;; (c-set-style "BOCM")
  40 ;;
  41 ;; This file is completely unsupported!  Although it has been patched
  42 ;; superficially to keep pace with the rest of CC Mode, it hasn't been
  43 ;; tested for a long time.
  44
  45 ;;; Code:
  46
  47 (eval-when-compile
  48   (let ((load-path
  49          (if (and (boundp 'byte-compile-dest-file)
  50                   (stringp byte-compile-dest-file))
  51              (cons (file-name-directory byte-compile-dest-file) load-path)
  52            load-path)))
  53     (load "cc-bytecomp" nil t)))
  54
  55 (cc-require 'cc-defs)
  56 (cc-require 'cc-vars)
  57 (cc-require 'cc-styles)
  58 (cc-require 'cc-engine)
  59
  60 \f
  61 ;; In case c-mode.el isn't loaded
  62 (defvar c-indent-level 2
  63   "*Indentation of C statements with respect to containing block.")
  64 ;;;###autoload(put 'c-indent-level 'safe-local-variable 'integerp)
  65
  66 (defvar c-brace-imaginary-offset 0
  67   "*Imagined indentation of a C open brace that actually follows a statement.")
  68 (defvar c-brace-offset 0
  69   "*Extra indentation for braces, compared with other text in same context.")
  70 (defvar c-argdecl-indent 5
  71   "*Indentation level of declarations of C function arguments.")
  72 (defvar c-label-offset -2
  73   "*Offset of C label lines and case statements relative to usual indentation.")
  74 (defvar c-continued-statement-offset 2
  75   "*Extra indent for lines not starting new statements.")
  76 (defvar c-continued-brace-offset 0
  77   "*Extra indent for substatements that start with open-braces.
  78 This is in addition to c-continued-statement-offset.")
  79
  80
  81 \f
  82 ;; these offsets are taken by brute force testing c-mode.el, since
  83 ;; there's no logic to what it does.
  84 (let* ((offsets '(c-offsets-alist .
  85                     ((defun-block-intro     . cc-block-intro-offset)
  86                      (statement-block-intro . cc-block-intro-offset)
  87                      (defun-open            . 0)
  88                      (class-open            . 0)
  89                      (inline-open           . c-brace-offset)
  90                      (block-open            . c-brace-offset)
  91                      (block-close           . cc-block-close-offset)
  92                      (brace-list-open       . c-brace-offset)
  93                      (substatement-open     . cc-substatement-open-offset)
  94                      (substatement          . c-continued-statement-offset)
  95                      (knr-argdecl-intro     . c-argdecl-indent)
  96                      (case-label            . c-label-offset)
  97                      (access-label          . c-label-offset)
  98                      (label                 . c-label-offset)
  99                      ))))
 100   (c-add-style "BOCM" offsets))
 101
 102
 103 (defun cc-block-intro-offset (langelem)
 104   ;; taken directly from calculate-c-indent confusion
 105   (save-excursion
 106     (c-backward-syntactic-ws)
 107     (if (eq (char-before) ?{)
 108         (forward-char -1)
 109       (goto-char (cdr langelem)))
 110     (let* ((curcol (save-excursion
 111                      (goto-char (cdr langelem))
 112                      (current-column)))
 113           (bocm-lossage
 114            ;; If no previous statement, indent it relative to line
 115            ;; brace is on.  For open brace in column zero, don't let
 116            ;; statement start there too.  If c-indent-level is zero,
 117            ;; use c-brace-offset + c-continued-statement-offset
 118            ;; instead.  For open-braces not the first thing in a line,
 119            ;; add in c-brace-imaginary-offset.
 120            (+ (if (and (bolp) (zerop c-indent-level))
 121                   (+ c-brace-offset c-continued-statement-offset)
 122                 c-indent-level)
 123               ;; Move back over whitespace before the openbrace.  If
 124               ;; openbrace is not first nonwhite thing on the line,
 125               ;; add the c-brace-imaginary-offset.
 126               (progn (skip-chars-backward " \t")
 127                      (if (bolp) 0 c-brace-imaginary-offset))
 128               ;; If the openbrace is preceded by a parenthesized exp,
 129               ;; move to the beginning of that; possibly a different
 130               ;; line
 131               (progn
 132                 (if (eq (char-before) ?\))
 133                     (c-forward-sexp -1))
 134                 ;; Get initial indentation of the line we are on.
 135                 (current-indentation)))))
 136       (- bocm-lossage curcol))))
 137
 138
 139 (defun cc-block-close-offset (langelem)
 140   (save-excursion
 141     (let* ((here (point))
 142            bracep
 143            (curcol (progn
 144                      (goto-char (cdr langelem))
 145                      (current-column)))
 146            (bocm-lossage (progn
 147                            (goto-char (cdr langelem))
 148                            (if (eq (char-after) ?{)
 149                                (setq bracep t)
 150                              (goto-char here)
 151                              (beginning-of-line)
 152                              (backward-up-list 1)
 153                              (forward-char 1)
 154                              (c-forward-syntactic-ws))
 155                            (current-column))))
 156       (- bocm-lossage curcol
 157          (if bracep 0 c-indent-level)))))
 158
 159
 160 (defun cc-substatement-open-offset (langelem)
 161   (+ c-continued-statement-offset c-continued-brace-offset))
 162
 163 \f
 164 (cc-provide 'cc-compat)
 165
 166 ;; arch-tag: 564dab2f-e6ad-499c-a4a3-fedec3ecc192
 167 ;;; cc-compat.el ends here