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;;; cc-compat.el --- cc-mode compatibility with c-mode.el confusion -*- lexical-binding: t; -*-
;; Copyright (C) 1985, 1987, 1992-2025 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
;; Keywords: c languages
;; Package: cc-mode
;; Obsolete-Since: 24.5
;; 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 <https://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)
;;; cc-compat.el ends here
|
