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bbfbe5ec33
defun block. (c-auto-newline): Removed this macro since it's not used anymore. (c-forward-comment): Removed the workaround introduced in 5.38 since it had worse side-effects. If a line contains the string "//\"", it regarded the // as a comment start since the \ temporarily doesn't have escape syntax.
325 lines
11 KiB
EmacsLisp
325 lines
11 KiB
EmacsLisp
;;; cc-defs.el --- compile time definitions for CC Mode
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;; Copyright (C) 1985,1987,1992-2000 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 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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;; Get all the necessary compile time definitions.
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(require 'custom)
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(require 'derived) ;only necessary in Emacs 20
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;; cc-mode-19.el contains compatibility macros that should be compiled
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;; in if needed.
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(if (or (not (fboundp 'functionp))
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(not (condition-case nil
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(progn (char-before) t)
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(error nil)))
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(not (condition-case nil
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(progn (char-after) t)
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(error nil)))
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(not (fboundp 'when))
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(not (fboundp 'unless)))
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(require 'cc-mode-19))
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(defmacro c-point (position)
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;; Returns the value of point at certain commonly referenced POSITIONs.
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;; POSITION can be one of the following symbols:
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;;
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;; bol -- beginning of line
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;; eol -- end of line
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;; bod -- beginning of defun
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;; eod -- end of defun
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;; boi -- back to indentation
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;; ionl -- indentation of next line
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;; iopl -- indentation of previous line
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;; bonl -- beginning of next line
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;; bopl -- beginning of previous line
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;;
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;; This function does not modify point or mark.
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`(save-excursion
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,(if (and (eq (car-safe position) 'quote)
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(symbolp (eval position)))
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(let ((position (eval position)))
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(cond
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((eq position 'bol) `(beginning-of-line))
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((eq position 'eol) `(end-of-line))
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((eq position 'boi) `(back-to-indentation))
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((eq position 'bonl) `(forward-line 1))
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((eq position 'bopl) `(forward-line -1))
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((eq position 'bod) `(c-beginning-of-defun-1))
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((eq position 'eod) `(c-end-of-defun-1))
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((eq position 'iopl) `(progn
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(forward-line -1)
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(back-to-indentation)))
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((eq position 'ionl) `(progn
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(forward-line 1)
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(back-to-indentation)))
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(t (error "unknown buffer position requested: %s" position))))
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;;(message "c-point long expansion")
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`(let ((position ,position))
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(cond
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((eq position 'bol) (beginning-of-line))
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((eq position 'eol) (end-of-line))
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((eq position 'boi) (back-to-indentation))
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((eq position 'bonl) (forward-line 1))
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((eq position 'bopl) (forward-line -1))
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((eq position 'bod) (c-beginning-of-defun-1))
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((eq position 'eod) (c-end-of-defun-1))
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((eq position 'iopl) (progn
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(forward-line -1)
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(back-to-indentation)))
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((eq position 'ionl) (progn
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(forward-line 1)
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(back-to-indentation)))
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(t (error "unknown buffer position requested: %s" position)))))
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(point)))
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(defmacro c-safe (&rest body)
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;; safely execute BODY, return nil if an error occurred
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`(condition-case nil
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(progn ,@body)
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(error nil)))
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(defsubst c-beginning-of-defun-1 ()
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;; Wrapper around beginning-of-defun.
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;;
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;; NOTE: This function should contain the only explicit use of
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;; beginning-of-defun in CC Mode. Eventually something better than
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;; b-o-d will be available and this should be the only place the
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;; code needs to change. Everything else should use
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;; (c-beginning-of-defun-1)
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(if (and (fboundp 'buffer-syntactic-context-depth)
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c-enable-xemacs-performance-kludge-p)
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;; XEmacs only. This can improve the performance of
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;; c-parse-state to between 3 and 60 times faster when
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;; braces are hung. It can also degrade performance by
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;; about as much when braces are not hung.
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(let (pos)
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(while (not pos)
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(save-restriction
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(widen)
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(setq pos (scan-lists (point) -1
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(buffer-syntactic-context-depth)
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nil t)))
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(cond
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((bobp) (setq pos (point-min)))
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((not pos)
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(let ((distance (skip-chars-backward "^{")))
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;; unbalanced parenthesis, while illegal C code,
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;; shouldn't cause an infloop! See unbal.c
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(when (zerop distance)
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;; Punt!
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(beginning-of-defun)
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(setq pos (point)))))
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((= pos 0))
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((not (eq (char-after pos) ?{))
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(goto-char pos)
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(setq pos nil))
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))
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(goto-char pos))
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;; Emacs, which doesn't have buffer-syntactic-context-depth
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(beginning-of-defun))
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;; if defun-prompt-regexp is non-nil, b-o-d won't leave us at the
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;; open brace.
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(and defun-prompt-regexp
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(looking-at defun-prompt-regexp)
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(goto-char (match-end 0))))
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(defsubst c-end-of-defun-1 ()
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;; Replacement for end-of-defun that use c-beginning-of-defun-1.
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(let ((start (point)))
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;; Skip forward into the next defun block. Don't bother to avoid
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;; comments, literals etc, since beginning-of-defun doesn't do that
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;; anyway.
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(skip-chars-forward "^}")
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(c-beginning-of-defun-1)
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(if (eq (char-after) ?{)
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(c-forward-sexp))
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(if (< (point) start)
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(goto-char (point-max)))))
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(defmacro c-forward-sexp (&optional arg)
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;; like forward-sexp except
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;; 1. this is much stripped down from the XEmacs version
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;; 2. this cannot be used as a command, so we're insulated from
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;; XEmacs' losing efforts to make forward-sexp more user
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;; friendly
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;; 3. Preserves the semantics most of CC Mode is based on
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(or arg (setq arg 1))
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`(goto-char (or (scan-sexps (point) ,arg)
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,(if (numberp arg)
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(if (> arg 0) `(point-max) `(point-min))
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`(if (> ,arg 0) (point-max) (point-min))))))
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(defmacro c-backward-sexp (&optional arg)
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;; See c-forward-sexp and reverse directions
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(or arg (setq arg 1))
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`(c-forward-sexp ,(if (numberp arg) (- arg) `(- ,arg))))
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(defsubst c-beginning-of-macro (&optional lim)
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;; Go to the beginning of a cpp macro definition. Leaves point at
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;; the beginning of the macro and returns t if in a cpp macro
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;; definition, otherwise returns nil and leaves point unchanged.
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;; `lim' is currently ignored, but the interface requires it.
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(let ((here (point)))
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(beginning-of-line)
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(while (eq (char-before (1- (point))) ?\\)
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(forward-line -1))
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(back-to-indentation)
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(if (and (<= (point) here)
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(eq (char-after) ?#))
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t
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(goto-char here)
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nil)))
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(defsubst c-forward-comment (count)
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;; Insulation from various idiosyncrasies in implementations of
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;; `forward-comment'. Note: Some emacsen considers incorrectly that
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;; any line comment ending with a backslash continues to the next
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;; line. I can't think of any way to work around that in a reliable
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;; way without changing the buffer though. Suggestions welcome. ;)
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(let ((here (point)))
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(if (>= count 0)
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(when (forward-comment count)
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;; Emacs includes the ending newline in a b-style
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;; (c++) comment, but XEmacs don't. We depend on the
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;; Emacs behavior (which also is symmetric).
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(if (and (eolp) (nth 7 (parse-partial-sexp here (point))))
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(condition-case nil (forward-char 1)))
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t)
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;; When we got newline terminated comments,
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;; forward-comment in all supported emacsen so far will
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;; stop at eol of each line not ending with a comment when
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;; moving backwards. The following corrects for it when
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;; count is -1. The other common case, when count is
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;; large and negative, works regardless. It's too much
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;; work to correct for the rest of the cases.
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(skip-chars-backward " \t\n\r\f")
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(if (bobp)
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;; Some emacsen return t when moving backwards at bob.
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nil
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(re-search-forward "[\n\r]" here t)
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(if (forward-comment count)
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(if (eolp) (forward-comment -1) t))))))
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(defmacro c-add-syntax (symbol &optional relpos)
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;; a simple macro to append the syntax in symbol to the syntax list.
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;; try to increase performance by using this macro
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`(setq syntax (cons (cons ,symbol ,relpos) syntax)))
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(defmacro c-add-class-syntax (symbol classkey)
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;; The inclass and class-close syntactic symbols are added in
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;; several places and some work is needed to fix everything.
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;; Therefore it's collected here.
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`(save-restriction
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(widen)
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(let ((symbol ,symbol)
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(classkey ,classkey))
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(goto-char (aref classkey 1))
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(if (and (eq symbol 'inclass) (= (point) (c-point 'boi)))
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(c-add-syntax symbol (point))
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(c-add-syntax symbol (aref classkey 0))
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(if (and c-inexpr-class-key (c-looking-at-inexpr-block))
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(c-add-syntax 'inexpr-class))))))
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(defsubst c-intersect-lists (list alist)
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;; return the element of ALIST that matches the first element found
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;; in LIST. Uses assq.
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(let (match)
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(while (and list
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(not (setq match (assq (car list) alist))))
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(setq list (cdr list)))
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match))
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(defsubst c-lookup-lists (list alist1 alist2)
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;; first, find the first entry from LIST that is present in ALIST1,
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;; then find the entry in ALIST2 for that entry.
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(assq (car (c-intersect-lists list alist1)) alist2))
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(defsubst c-langelem-col (langelem &optional preserve-point)
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;; convenience routine to return the column of langelem's relpos.
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;; Leaves point at the relpos unless preserve-point is non-nil.
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(if (cdr langelem)
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(let ((here (point)))
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(goto-char (cdr langelem))
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(prog1 (current-column)
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(if preserve-point
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(goto-char here))
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))
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0))
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(defmacro c-update-modeline ()
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;; set the c-auto-hungry-string for the correct designation on the modeline
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`(progn
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(setq c-auto-hungry-string
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(if c-auto-newline
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(if c-hungry-delete-key "/ah" "/a")
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(if c-hungry-delete-key "/h" nil)))
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(force-mode-line-update)))
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(defsubst c-keep-region-active ()
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;; Do whatever is necessary to keep the region active in XEmacs.
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;; Ignore byte-compiler warnings you might see. This is not needed
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;; for Emacs.
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(and (boundp 'zmacs-region-stays)
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(setq zmacs-region-stays t)))
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(defsubst c-region-is-active-p ()
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;; Return t when the region is active. The determination of region
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;; activeness is different in both Emacs and XEmacs.
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(cond
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;; XEmacs
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((and (fboundp 'region-active-p)
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(boundp 'zmacs-regions)
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zmacs-regions)
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(region-active-p))
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;; Emacs
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((boundp 'mark-active) mark-active)
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;; fallback; shouldn't get here
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(t (mark t))))
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(defsubst c-major-mode-is (mode)
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(eq (derived-mode-class major-mode) mode))
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(defmacro c-with-syntax-table (table &rest code)
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;; Temporarily switches to the specified syntax table in a failsafe
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;; way to execute code.
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`(let ((c-with-syntax-table-orig-table (syntax-table)))
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(unwind-protect
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(progn
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(set-syntax-table ,table)
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,@code)
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(set-syntax-table c-with-syntax-table-orig-table))))
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(put 'c-with-syntax-table 'lisp-indent-function 1)
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(provide 'cc-defs)
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;;; cc-defs.el ends here
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