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150 lines
5.1 KiB
EmacsLisp
150 lines
5.1 KiB
EmacsLisp
;;; cc-compat.el --- cc-mode compatibility with c-mode.el confusion
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;; Copyright (C) 1985,87,92,93,94,95,96,97 Free Software Foundation, Inc.
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;; Author: 1994-1997 Barry A. Warsaw
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;; Maintainer: cc-mode-help@python.org
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;; Created: August 1994, split from cc-mode.el
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;; Version: 5.12
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;; Keywords: c languages oop
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;
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;; Boring old c-mode.el (BOCM) is confusion and brain melt. cc-mode.el
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;; is clarity of thought and purity of chi. If you are still unwilling
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;; to accept enlightenment, this might help, or it may prolong your
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;; agony.
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;;
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;; To use, add the following to your c-mode-hook:
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;;
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;; (require 'cc-compat)
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;; (c-set-style "BOCM")
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;;; Code:
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(eval-when-compile
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(require 'cc-styles)
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(require 'cc-engine))
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;; In case c-mode.el isn't loaded
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(defvar c-indent-level 2
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"*Indentation of C statements with respect to containing block.")
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(defvar c-brace-imaginary-offset 0
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"*Imagined indentation of a C open brace that actually follows a statement.")
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(defvar c-brace-offset 0
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"*Extra indentation for braces, compared with other text in same context.")
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(defvar c-argdecl-indent 5
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"*Indentation level of declarations of C function arguments.")
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(defvar c-label-offset -2
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"*Offset of C label lines and case statements relative to usual indentation.")
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(defvar c-continued-statement-offset 2
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"*Extra indent for lines not starting new statements.")
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(defvar c-continued-brace-offset 0
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"*Extra indent for substatements that start with open-braces.
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This is in addition to c-continued-statement-offset.")
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;; these offsets are taken by brute force testing c-mode.el, since
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;; there's no logic to what it does.
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(let* ((offsets '(c-offsets-alist .
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((defun-block-intro . cc-block-intro-offset)
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(statement-block-intro . cc-block-intro-offset)
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(defun-open . 0)
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(class-open . 0)
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(inline-open . c-brace-offset)
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(block-open . c-brace-offset)
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(block-close . cc-block-close-offset)
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(brace-list-open . c-brace-offset)
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(substatement-open . cc-substatement-open-offset)
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(substatement . c-continued-statement-offset)
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(knr-argdecl-intro . c-argdecl-indent)
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(case-label . c-label-offset)
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(access-label . c-label-offset)
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(label . c-label-offset)
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))))
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(c-add-style "BOCM" offsets))
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(defun cc-block-intro-offset (langelem)
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;; taken directly from calculate-c-indent confusion
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(save-excursion
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(c-backward-syntactic-ws)
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(if (eq (char-before) ?{)
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(forward-char -1)
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(goto-char (cdr langelem)))
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(let* ((curcol (save-excursion
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(goto-char (cdr langelem))
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(current-column)))
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(bocm-lossage
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;; If no previous statement, indent it relative to line
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;; brace is on. For open brace in column zero, don't let
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;; statement start there too. If c-indent-level is zero,
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;; use c-brace-offset + c-continued-statement-offset
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;; instead. For open-braces not the first thing in a line,
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;; add in c-brace-imaginary-offset.
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(+ (if (and (bolp) (zerop c-indent-level))
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(+ c-brace-offset c-continued-statement-offset)
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c-indent-level)
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;; Move back over whitespace before the openbrace. If
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;; openbrace is not first nonwhite thing on the line,
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;; add the c-brace-imaginary-offset.
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(progn (skip-chars-backward " \t")
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(if (bolp) 0 c-brace-imaginary-offset))
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;; If the openbrace is preceded by a parenthesized exp,
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;; move to the beginning of that; possibly a different
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;; line
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(progn
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(if (eq (char-before) ?\))
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(forward-sexp -1))
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;; Get initial indentation of the line we are on.
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(current-indentation)))))
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(- bocm-lossage curcol))))
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(defun cc-block-close-offset (langelem)
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(save-excursion
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(let* ((here (point))
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bracep
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(curcol (progn
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(goto-char (cdr langelem))
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(current-column)))
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(bocm-lossage (progn
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(goto-char (cdr langelem))
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(if (eq (char-after) ?{)
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(setq bracep t)
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(goto-char here)
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(beginning-of-line)
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(backward-up-list 1)
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(forward-char 1)
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(c-forward-syntactic-ws))
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(current-column))))
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(- bocm-lossage curcol
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(if bracep 0 c-indent-level)))))
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(defun cc-substatement-open-offset (langelem)
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(+ c-continued-statement-offset c-continued-brace-offset))
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(provide 'cc-compat)
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;;; cc-compat.el ends here
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