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225 lines
7.3 KiB
EmacsLisp
225 lines
7.3 KiB
EmacsLisp
;;; cc-defs.el --- compile time definitions for CC Mode
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;; Copyright (C) 1985,87,92,93,94,95,96,97,98 Free Software Foundation, Inc.
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;; Authors: 1998 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 'cc-menus)
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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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(defsubst 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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(let ((here (point)))
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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 'iopl)
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(forward-line -1)
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(back-to-indentation))
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((eq position 'ionl)
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(forward-line 1)
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(back-to-indentation))
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((eq position 'eod) (c-end-of-defun))
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((eq position 'bod)
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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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;;
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;; NOTE: This should be the only explicit use of
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;; beginning-of-defun in CC Mode. Eventually something better
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;; than b-o-d will be available and this should be the only
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;; place the code needs to change. Everything else should use
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;; (goto-char (c-point 'bod))
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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
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;; the 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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))
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(t (error "unknown buffer position requested: %s" position))
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)
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(prog1
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(point)
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(goto-char here))))
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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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(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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(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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(defsubst c-auto-newline ()
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;; if auto-newline feature is turned on, insert a newline character
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;; and return t, otherwise return nil.
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(and c-auto-newline
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(not (c-in-literal))
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(not (newline))))
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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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(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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(defsubst c-update-modeline ()
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;; set the c-auto-hungry-string for the correct designation on the modeline
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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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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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(provide 'cc-defs)
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;;; cc-defs.el ends here
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