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599 lines
21 KiB
EmacsLisp
599 lines
21 KiB
EmacsLisp
;;; cc-styles.el --- support for styles in CC Mode
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;; Copyright (C) 1985,1987,1992-2001 Free Software Foundation, Inc.
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;; Authors: 2000- Martin Stjernholm
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;; 1998-1999 Barry A. Warsaw and Martin Stjernholm
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;; 1992-1997 Barry A. Warsaw
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;; 1987 Dave Detlefs and Stewart Clamen
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;; 1985 Richard M. Stallman
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;; Maintainer: bug-cc-mode@gnu.org
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;; Created: 22-Apr-1997 (split from cc-mode.el)
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;; Version: See cc-mode.el
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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
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;; the 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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;;; Code:
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(eval-when-compile
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(let ((load-path
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(if (and (boundp 'byte-compile-dest-file)
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(stringp byte-compile-dest-file))
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(cons (file-name-directory byte-compile-dest-file) load-path)
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load-path)))
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(require 'cc-bytecomp)))
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(cc-require 'cc-defs)
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(cc-require 'cc-langs)
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(cc-require 'cc-vars)
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(cc-require 'cc-align)
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;; cc-align is only indirectly required: Styles added with
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;; `c-add-style' often contains references to functions defined there.
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;; Silence the compiler.
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(cc-bytecomp-defvar adaptive-fill-first-line-regexp) ; Emacs
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;; Warning: don't eval-defun this constant or you'll break style inheritance.
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(defconst c-style-alist
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'(("gnu"
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(c-basic-offset . 2)
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(c-comment-only-line-offset . (0 . 0))
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(c-offsets-alist . ((statement-block-intro . +)
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(knr-argdecl-intro . 5)
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(substatement-open . +)
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(substatement-label . 0)
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(label . 0)
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(statement-case-open . +)
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(statement-cont . +)
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(arglist-intro . c-lineup-arglist-intro-after-paren)
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(arglist-close . c-lineup-arglist)
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(inline-open . 0)
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(brace-list-open . +)
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))
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(c-special-indent-hook . c-gnu-impose-minimum)
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(c-block-comment-prefix . "")
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)
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("k&r"
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(c-basic-offset . 5)
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(c-comment-only-line-offset . 0)
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(c-offsets-alist . ((statement-block-intro . +)
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(knr-argdecl-intro . 0)
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(substatement-open . 0)
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(substatement-label . 0)
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(label . 0)
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(statement-cont . +)
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))
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)
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("bsd"
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(c-basic-offset . 8)
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(c-comment-only-line-offset . 0)
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(c-offsets-alist . ((statement-block-intro . +)
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(knr-argdecl-intro . +)
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(substatement-open . 0)
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(substatement-label . 0)
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(label . 0)
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(statement-cont . +)
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(inline-open . 0)
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(inexpr-class . 0)
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))
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)
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("stroustrup"
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(c-basic-offset . 4)
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(c-comment-only-line-offset . 0)
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(c-offsets-alist . ((statement-block-intro . +)
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(substatement-open . 0)
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(substatement-label . 0)
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(label . 0)
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(statement-cont . +)
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))
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)
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("whitesmith"
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(c-basic-offset . 4)
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(c-comment-only-line-offset . 0)
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(c-offsets-alist . ((knr-argdecl-intro . +)
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(label . 0)
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(statement-cont . +)
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(substatement-open . +)
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(substatement-label . +)
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(block-open . +)
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(statement-block-intro . c-lineup-whitesmith-in-block)
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(block-close . c-lineup-whitesmith-in-block)
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(inline-open . +)
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(defun-open . +)
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(defun-block-intro . c-lineup-whitesmith-in-block)
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(defun-close . c-lineup-whitesmith-in-block)
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(brace-list-open . +)
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(brace-list-intro . c-lineup-whitesmith-in-block)
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(brace-entry-open . c-indent-multi-line-block)
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(brace-list-close . c-lineup-whitesmith-in-block)
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(class-open . +)
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(inclass . c-lineup-whitesmith-in-block)
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(class-close . +)
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(inexpr-class . 0)
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(extern-lang-open . +)
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(inextern-lang . c-lineup-whitesmith-in-block)
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(extern-lang-close . +)
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(namespace-open . +)
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(innamespace . c-lineup-whitesmith-in-block)
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(namespace-close . +)
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))
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)
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("ellemtel"
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(c-basic-offset . 3)
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(c-comment-only-line-offset . 0)
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(c-hanging-braces-alist . ((substatement-open before after)))
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(c-offsets-alist . ((topmost-intro . 0)
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(substatement . +)
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(substatement-open . 0)
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(case-label . +)
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(access-label . -)
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(inclass . ++)
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(inline-open . 0)
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))
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)
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("linux"
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(c-basic-offset . 8)
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(c-comment-only-line-offset . 0)
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(c-hanging-braces-alist . ((brace-list-open)
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(brace-entry-open)
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(substatement-open after)
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(block-close . c-snug-do-while)))
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(c-cleanup-list . (brace-else-brace))
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(c-offsets-alist . ((statement-block-intro . +)
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(knr-argdecl-intro . 0)
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(substatement-open . 0)
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(substatement-label . 0)
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(label . 0)
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(statement-cont . +)
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))
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)
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("python"
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(indent-tabs-mode . t)
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(fill-column . 78)
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(c-basic-offset . 8)
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(c-offsets-alist . ((substatement-open . 0)
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(inextern-lang . 0)
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(arglist-intro . +)
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(knr-argdecl-intro . +)
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))
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(c-hanging-braces-alist . ((brace-list-open)
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(brace-list-intro)
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(brace-list-close)
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(brace-entry-open)
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(substatement-open after)
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(block-close . c-snug-do-while)
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))
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(c-block-comment-prefix . "")
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)
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("java"
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(c-basic-offset . 4)
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(c-comment-only-line-offset . (0 . 0))
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;; the following preserves Javadoc starter lines
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(c-offsets-alist . ((inline-open . 0)
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(topmost-intro-cont . +)
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(statement-block-intro . +)
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(knr-argdecl-intro . 5)
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(substatement-open . +)
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(substatement-label . +)
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(label . +)
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(statement-case-open . +)
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(statement-cont . +)
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(arglist-intro . c-lineup-arglist-intro-after-paren)
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(arglist-close . c-lineup-arglist)
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(access-label . 0)
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(inher-cont . c-lineup-java-inher)
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(func-decl-cont . c-lineup-java-throws)
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))
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)
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)
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"Styles of indentation.
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Elements of this alist are of the form:
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(STYLE-STRING [BASE-STYLE] (VARIABLE . VALUE) [(VARIABLE . VALUE) ...])
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where STYLE-STRING is a short descriptive string used to select a
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style, VARIABLE is any Emacs variable, and VALUE is the intended value
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for that variable when using the selected style.
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Optional BASE-STYLE if present, is a string and must follow
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STYLE-STRING. BASE-STYLE names a style that this style inherits from.
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By default, all styles inherit from the \"user\" style, which is
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computed at run time. Style loops generate errors.
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Two variables are treated specially. When VARIABLE is
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`c-offsets-alist', the VALUE is a list containing elements of the
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form:
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(SYNTACTIC-SYMBOL . OFFSET)
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as described in `c-offsets-alist'. These are passed directly to
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`c-set-offset' so there is no need to set every syntactic symbol in
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your style, only those that are different from the default.
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When VARIABLE is `c-special-indent-hook', its VALUE is added to
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`c-special-indent-hook' using `add-hook'. If VALUE is a list, each
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element of the list is added with `add-hook'.
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Do not change this variable directly. Use the function `c-add-style'
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to add new styles or modify existing styles (it is not a good idea to
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modify existing styles -- you should create a new style that inherits
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the existing style.")
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;; Functions that manipulate styles
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(defun c-set-style-1 (conscell dont-override)
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;; Set the style for one variable
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(let ((attr (car conscell))
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(val (cdr conscell)))
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(cond
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;; first special variable
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((eq attr 'c-offsets-alist)
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(mapcar
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(function
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(lambda (langentry)
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(let ((langelem (car langentry))
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(offset (cdr langentry)))
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(unless (and dont-override
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(assq langelem c-offsets-alist))
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(c-set-offset langelem offset))
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)))
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(if dont-override (reverse val) val)))
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;; second special variable
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((eq attr 'c-special-indent-hook)
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(let ((add-func (if dont-override
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(lambda (func)
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(unless (memq func c-special-indent-hook)
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(add-hook 'c-special-indent-hook func t)))
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(lambda (func)
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(add-hook 'c-special-indent-hook func)))))
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(if (listp val)
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(mapcar add-func (if dont-override (reverse val) val))
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(funcall add-func val))))
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;; all other variables
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(t (when (or (not dont-override)
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(not (memq attr c-style-variables))
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(eq (symbol-value attr) 'set-from-style))
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(set attr val)
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;; Must update a number of other variables if
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;; c-comment-prefix-regexp is set.
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(if (eq attr 'c-comment-prefix-regexp)
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(c-setup-paragraph-variables)))))))
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(defun c-get-style-variables (style basestyles)
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;; Return all variables in a style by resolving inheritances.
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(if (not style)
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(copy-alist c-fallback-style)
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(let ((vars (cdr (or (assoc (downcase style) c-style-alist)
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(assoc (upcase style) c-style-alist)
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(assoc style c-style-alist)
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(progn
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(c-benign-error "Undefined style: %s" style)
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nil)))))
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(let ((base (and (stringp (car-safe vars))
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(prog1
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(downcase (car vars))
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(setq vars (cdr vars))))))
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(if (memq base basestyles)
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(c-benign-error "Style loop detected: %s in %s" base basestyles)
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(nconc (c-get-style-variables base (cons base basestyles))
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(copy-alist vars)))))))
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(defvar c-set-style-history nil)
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;;;###autoload
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(defun c-set-style (stylename &optional dont-override)
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"Set CC Mode variables to use one of several different indentation styles.
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STYLENAME is a string representing the desired style from the list of
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styles described in the variable `c-style-alist'. See that variable
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for details of setting up styles.
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The variable `c-indentation-style' always contains the buffer's current
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style name.
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If the optional argument DONT-OVERRIDE is non-nil, no style variables
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that already have values will be overridden. I.e. in the case of
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`c-offsets-alist', syntactic symbols will only be added, and in the
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case of all other style variables, only those set to `set-from-style'
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will be reassigned.
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Obviously, specifying DONT-OVERRIDE is useful mainly when the initial
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style is chosen for a CC Mode buffer by a major mode. Since this is
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done internally by CC Mode, there's hardly ever a reason to use it."
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(interactive
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(list (let ((completion-ignore-case t)
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(prompt (format "Which %s indentation style? "
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mode-name)))
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(condition-case nil
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;; The default argument is preferred over
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;; initial-contents, but it only exists in Emacs >= 20
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;; and XEmacs >= 21.
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(completing-read prompt c-style-alist nil t nil
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'c-set-style-history
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c-indentation-style)
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(wrong-number-of-arguments
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;; If the call above failed, we fall back to the old way
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;; of specifying the default value.
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(completing-read prompt c-style-alist nil t
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(cons c-indentation-style 0)
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'c-set-style-history))))))
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(c-initialize-builtin-style)
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(let ((vars (c-get-style-variables stylename nil)))
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(unless dont-override
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;; Since we always add to c-special-indent-hook we must reset it
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;; first, or else the hooks from the preceding style will
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;; remain. This is not necessary for c-offsets-alist, since
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;; c-get-style-variables contains every valid offset type in the
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;; fallback entry.
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(setq c-special-indent-hook
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(default-value 'c-special-indent-hook)))
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(mapcar (lambda (elem)
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(c-set-style-1 elem dont-override))
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;; Need to go through the variables backwards when we
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;; don't override.
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(if dont-override (nreverse vars) vars)))
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(setq c-indentation-style stylename)
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(c-keep-region-active))
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;;;###autoload
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(defun c-add-style (style descrip &optional set-p)
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"Adds a style to `c-style-alist', or updates an existing one.
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STYLE is a string identifying the style to add or update. DESCRIP is
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an association list describing the style and must be of the form:
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([BASESTYLE] (VARIABLE . VALUE) [(VARIABLE . VALUE) ...])
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See the variable `c-style-alist' for the semantics of BASESTYLE,
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VARIABLE and VALUE. This function also sets the current style to
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STYLE using `c-set-style' if the optional SET-P flag is non-nil."
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(interactive
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(let ((stylename (completing-read "Style to add: " c-style-alist
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nil nil nil 'c-set-style-history))
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(description (eval-minibuffer "Style description: ")))
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(list stylename description
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(y-or-n-p "Set the style too? "))))
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(setq style (downcase style))
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(let ((s (assoc style c-style-alist)))
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(if s
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(setcdr s (copy-alist descrip)) ; replace
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(setq c-style-alist (cons (cons style descrip) c-style-alist))))
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(and set-p (c-set-style style)))
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(defvar c-read-offset-history nil)
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(defun c-read-offset (langelem)
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;; read new offset value for LANGELEM from minibuffer. return a
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;; legal value only
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(let* ((oldoff (cdr-safe (or (assq langelem c-offsets-alist)
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(assq langelem (get 'c-offsets-alist
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'c-stylevar-fallback)))))
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(symname (symbol-name langelem))
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(defstr (format "(default %s): " oldoff))
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(errmsg (concat "Offset must be int, func, var, vector, list, "
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"or [+,-,++,--,*,/] "
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defstr))
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(prompt (concat symname " offset " defstr))
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(keymap (make-sparse-keymap))
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(minibuffer-completion-table obarray)
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(minibuffer-completion-predicate 'fboundp)
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offset input)
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;; In principle completing-read is used here, but SPC is unbound
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;; to make it less annoying to enter lists.
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(set-keymap-parent keymap minibuffer-local-completion-map)
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(define-key keymap " " 'self-insert-command)
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(while (not offset)
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(setq input (read-from-minibuffer prompt nil keymap t
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'c-read-offset-history
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(format "%s" oldoff)))
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(if (c-valid-offset input)
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(setq offset input)
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;; error, but don't signal one, keep trying
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;; to read an input value
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(ding)
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(setq prompt errmsg)))
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offset))
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;;;###autoload
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(defun c-set-offset (symbol offset &optional ignored)
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"Change the value of a syntactic element symbol in `c-offsets-alist'.
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SYMBOL is the syntactic element symbol to change and OFFSET is the new
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offset for that syntactic element. The optional argument is not used
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and exists only for compatibility reasons."
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(interactive
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(let* ((langelem
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(intern (completing-read
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(concat "Syntactic symbol to change"
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(if current-prefix-arg " or add" "")
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": ")
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(mapcar
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#'(lambda (langelem)
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(cons (format "%s" (car langelem)) nil))
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(get 'c-offsets-alist 'c-stylevar-fallback))
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nil (not current-prefix-arg)
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;; initial contents tries to be the last element
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;; on the syntactic analysis list for the current
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;; line
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(let* ((syntax (c-guess-basic-syntax))
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(len (length syntax))
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(ic (format "%s" (car (nth (1- len) syntax)))))
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(cons ic 0))
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)))
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(offset (c-read-offset langelem)))
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(list langelem offset current-prefix-arg)))
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;; sanity check offset
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(if (c-valid-offset offset)
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(let ((entry (assq symbol c-offsets-alist)))
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(if entry
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(setcdr entry offset)
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(if (assq symbol (get 'c-offsets-alist 'c-stylevar-fallback))
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(setq c-offsets-alist (cons (cons symbol offset)
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c-offsets-alist))
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(c-benign-error "%s is not a valid syntactic symbol" symbol))))
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(c-benign-error "Invalid indentation setting for symbol %s: %s"
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symbol offset))
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(c-keep-region-active))
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(defun c-setup-paragraph-variables ()
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"Fix things up for paragraph recognition and filling inside comments by
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incorporating the value of `c-comment-prefix-regexp' in the relevant
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variables."
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(setq c-current-comment-prefix
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(if (listp c-comment-prefix-regexp)
|
||
(cdr-safe (or (assoc major-mode c-comment-prefix-regexp)
|
||
(assoc 'other c-comment-prefix-regexp)))
|
||
c-comment-prefix-regexp))
|
||
(let ((comment-line-prefix
|
||
(concat "[ \t]*\\(" c-current-comment-prefix "\\)[ \t]*")))
|
||
(setq paragraph-start (concat comment-line-prefix
|
||
(c-lang-var paragraph-start)
|
||
"\\|"
|
||
page-delimiter)
|
||
paragraph-separate (concat comment-line-prefix
|
||
(c-lang-var paragraph-separate)
|
||
"\\|"
|
||
page-delimiter)
|
||
paragraph-ignore-fill-prefix t
|
||
adaptive-fill-mode t
|
||
adaptive-fill-regexp
|
||
(concat comment-line-prefix
|
||
(if (default-value 'adaptive-fill-regexp)
|
||
(concat "\\("
|
||
(default-value 'adaptive-fill-regexp)
|
||
"\\)")
|
||
"")))
|
||
(when (boundp 'adaptive-fill-first-line-regexp)
|
||
;; XEmacs (20.x) adaptive fill mode doesn't have this.
|
||
(make-local-variable 'adaptive-fill-first-line-regexp)
|
||
(setq adaptive-fill-first-line-regexp
|
||
(concat "\\`" comment-line-prefix
|
||
;; Maybe we should incorporate the old value here,
|
||
;; but then we have to do all sorts of kludges to
|
||
;; deal with the \` and \' it probably contains.
|
||
"\\'")))))
|
||
|
||
|
||
;; Helper for setting up Filladapt mode. It's not used by CC Mode itself.
|
||
|
||
(cc-bytecomp-defvar filladapt-token-table)
|
||
(cc-bytecomp-defvar filladapt-token-match-table)
|
||
(cc-bytecomp-defvar filladapt-token-conversion-table)
|
||
|
||
(defun c-setup-filladapt ()
|
||
"Convenience function to configure Kyle E. Jones' Filladapt mode for
|
||
CC Mode by making sure the proper entries are present on
|
||
`filladapt-token-table', `filladapt-token-match-table', and
|
||
`filladapt-token-conversion-table'. This is intended to be used on
|
||
`c-mode-common-hook' or similar."
|
||
;; This function is intended to be used explicitly by the end user
|
||
;; only.
|
||
;;
|
||
;; The default configuration already handles C++ comments, but we
|
||
;; need to add handling of C block comments. A new filladapt token
|
||
;; `c-comment' is added for that.
|
||
(let (p)
|
||
(setq p filladapt-token-table)
|
||
(while (and p (not (eq (car-safe (cdr-safe (car-safe p))) 'c-comment)))
|
||
(setq p (cdr-safe p)))
|
||
(if p
|
||
(setcar (car p) c-current-comment-prefix)
|
||
(setq filladapt-token-table
|
||
(append (list (car filladapt-token-table)
|
||
(list c-current-comment-prefix 'c-comment))
|
||
(cdr filladapt-token-table)))))
|
||
(unless (assq 'c-comment filladapt-token-match-table)
|
||
(setq filladapt-token-match-table
|
||
(append '((c-comment c-comment))
|
||
filladapt-token-match-table)))
|
||
(unless (assq 'c-comment filladapt-token-conversion-table)
|
||
(setq filladapt-token-conversion-table
|
||
(append '((c-comment . exact))
|
||
filladapt-token-conversion-table))))
|
||
|
||
|
||
(defun c-initialize-builtin-style ()
|
||
;; Dynamically append the default value of most variables. This is
|
||
;; crucial because future c-set-style calls will always reset the
|
||
;; variables first to the `cc-mode' style before instituting the new
|
||
;; style. Only do this once!
|
||
(unless (get 'c-initialize-builtin-style 'is-run)
|
||
(put 'c-initialize-builtin-style 'is-run t)
|
||
;;(c-initialize-cc-mode)
|
||
(unless (assoc "user" c-style-alist)
|
||
(let ((vars c-style-variables) var val uservars)
|
||
(while vars
|
||
(setq var (car vars)
|
||
val (symbol-value var)
|
||
vars (cdr vars))
|
||
(cond ((eq var 'c-offsets-alist)
|
||
(or (null val)
|
||
(setq uservars (cons (cons 'c-offsets-alist val)
|
||
uservars))))
|
||
((not (eq val 'set-from-style))
|
||
(setq uservars (cons (cons var val)
|
||
uservars)))))
|
||
(c-add-style "user" uservars)))
|
||
(unless (assoc "cc-mode" c-style-alist)
|
||
(c-add-style "cc-mode" '("user")))
|
||
(if c-style-variables-are-local-p
|
||
(c-make-styles-buffer-local))))
|
||
|
||
(defun c-make-styles-buffer-local (&optional this-buf-only-p)
|
||
"Make all CC Mode style variables buffer local.
|
||
If you edit primarily one style of C (or C++, Objective-C, Java, etc)
|
||
code, you probably want style variables to be global. This is the
|
||
default.
|
||
|
||
If you edit many different styles of C (or C++, Objective-C, Java,
|
||
etc) at the same time, you probably want the CC Mode style variables
|
||
to be buffer local. If you do, it's advicable to set any CC Mode
|
||
style variables in a hook function (e.g. off of `c-mode-common-hook'),
|
||
instead of at the top level of your ~/.emacs file.
|
||
|
||
This function makes all the CC Mode style variables buffer local.
|
||
Call it after CC Mode is loaded into your Emacs environment.
|
||
Conversely, set the variable `c-style-variables-are-local-p' to t in
|
||
your .emacs file, before CC Mode is loaded, and this function will be
|
||
automatically called when CC Mode is loaded.
|
||
|
||
Optional argument, when non-nil, means use `make-local-variable'
|
||
instead of `make-variable-buffer-local'."
|
||
;; style variables
|
||
(let ((func (if this-buf-only-p
|
||
'make-local-variable
|
||
'make-variable-buffer-local))
|
||
(varsyms (cons 'c-indentation-style (copy-alist c-style-variables))))
|
||
(delq 'c-special-indent-hook varsyms)
|
||
(mapcar func varsyms)
|
||
;; Hooks must be handled specially
|
||
(if this-buf-only-p
|
||
(make-local-hook 'c-special-indent-hook)
|
||
(make-variable-buffer-local 'c-special-indent-hook)
|
||
(setq c-style-variables-are-local-p t))
|
||
))
|
||
|
||
|
||
|
||
(cc-provide 'cc-styles)
|
||
|
||
;;; cc-styles.el ends here
|