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1 | ;;; cc-defs.el --- definitions for CC Mode |
2 | ||
3 | ;; Copyright (C) 1985,87,92,93,94,95,96,97 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Authors: 1992-1997 Barry A. Warsaw | |
6 | ;; 1987 Dave Detlefs and Stewart Clamen | |
7 | ;; 1985 Richard M. Stallman | |
8 | ;; Maintainer: cc-mode-help@python.org | |
9 | ;; Created: 22-Apr-1997 (split from cc-mode.el) | |
e76df57d | 10 | ;; Version: 5.15 |
785eecbb RS |
11 | ;; Keywords: c languages oop |
12 | ||
13 | ;; This file is part of GNU Emacs. | |
14 | ||
15 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
16 | ;; it under the terms of the GNU General Public License as published by | |
17 | ;; the Free Software Foundation; either version 2, or (at your option) | |
18 | ;; any later version. | |
19 | ||
20 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
21 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23 | ;; GNU General Public License for more details. | |
24 | ||
25 | ;; You should have received a copy of the GNU General Public License | |
26 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
27 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
28 | ;; Boston, MA 02111-1307, USA. | |
29 | ||
30 | \f | |
31 | ;; Figure out what features this Emacs has | |
32 | (defconst c-emacs-features | |
33 | (let ((infodock-p (boundp 'infodock-version)) | |
34 | (comments | |
35 | ;; XEmacs 19 and beyond use 8-bit modify-syntax-entry flags. | |
36 | ;; Emacs 19 uses a 1-bit flag. We will have to set up our | |
37 | ;; syntax tables differently to handle this. | |
38 | (let ((table (copy-syntax-table)) | |
39 | entry) | |
40 | (modify-syntax-entry ?a ". 12345678" table) | |
41 | (cond | |
42 | ;; XEmacs 19, and beyond Emacs 19.34 | |
43 | ((arrayp table) | |
44 | (setq entry (aref table ?a)) | |
45 | ;; In Emacs, table entries are cons cells | |
46 | (if (consp entry) (setq entry (car entry)))) | |
47 | ;; XEmacs 20 | |
48 | ((fboundp 'get-char-table) (setq entry (get-char-table ?a table))) | |
49 | ;; before and including Emacs 19.34 | |
50 | ((and (fboundp 'char-table-p) | |
51 | (char-table-p table)) | |
52 | (setq entry (car (char-table-range table [?a])))) | |
53 | ;; incompatible | |
54 | (t (error "CC Mode is incompatible with this version of Emacs"))) | |
55 | (if (= (logand (lsh entry -16) 255) 255) | |
56 | '8-bit | |
57 | '1-bit)))) | |
58 | (if infodock-p | |
59 | (list comments 'infodock) | |
60 | (list comments))) | |
61 | "A list of features extant in the Emacs you are using. | |
62 | There are many flavors of Emacs out there, each with different | |
63 | features supporting those needed by CC Mode. Here's the current | |
64 | supported list, along with the values for this variable: | |
65 | ||
66 | XEmacs 19: (8-bit) | |
67 | XEmacs 20: (8-bit) | |
68 | Emacs 19: (1-bit) | |
69 | ||
70 | Infodock (based on XEmacs) has an additional symbol on this list: | |
71 | 'infodock.") | |
72 | ||
73 | ||
74 | \f | |
75 | (defsubst c-point (position) | |
76 | ;; Returns the value of point at certain commonly referenced POSITIONs. | |
77 | ;; POSITION can be one of the following symbols: | |
78 | ;; | |
79 | ;; bol -- beginning of line | |
80 | ;; eol -- end of line | |
81 | ;; bod -- beginning of defun | |
82 | ;; boi -- back to indentation | |
83 | ;; ionl -- indentation of next line | |
84 | ;; iopl -- indentation of previous line | |
85 | ;; bonl -- beginning of next line | |
86 | ;; bopl -- beginning of previous line | |
87 | ;; | |
88 | ;; This function does not modify point or mark. | |
89 | (let ((here (point))) | |
90 | (cond | |
91 | ((eq position 'bol) (beginning-of-line)) | |
92 | ((eq position 'eol) (end-of-line)) | |
93 | ((eq position 'bod) | |
94 | (beginning-of-defun) | |
95 | ;; if defun-prompt-regexp is non-nil, b-o-d won't leave us at | |
96 | ;; the open brace. | |
97 | (and defun-prompt-regexp | |
98 | (looking-at defun-prompt-regexp) | |
99 | (goto-char (match-end 0))) | |
100 | ) | |
101 | ((eq position 'boi) (back-to-indentation)) | |
102 | ((eq position 'bonl) (forward-line 1)) | |
103 | ((eq position 'bopl) (forward-line -1)) | |
104 | ((eq position 'iopl) | |
105 | (forward-line -1) | |
106 | (back-to-indentation)) | |
107 | ((eq position 'ionl) | |
108 | (forward-line 1) | |
109 | (back-to-indentation)) | |
110 | (t (error "unknown buffer position requested: %s" position)) | |
111 | ) | |
112 | (prog1 | |
113 | (point) | |
114 | (goto-char here)))) | |
115 | ||
116 | (defmacro c-safe (&rest body) | |
117 | ;; safely execute BODY, return nil if an error occurred | |
118 | (` (condition-case nil | |
119 | (progn (,@ body)) | |
120 | (error nil)))) | |
121 | ||
122 | (defmacro c-add-syntax (symbol &optional relpos) | |
123 | ;; a simple macro to append the syntax in symbol to the syntax list. | |
124 | ;; try to increase performance by using this macro | |
125 | (` (setq syntax (cons (cons (, symbol) (, relpos)) syntax)))) | |
126 | ||
127 | (defsubst c-auto-newline () | |
128 | ;; if auto-newline feature is turned on, insert a newline character | |
129 | ;; and return t, otherwise return nil. | |
130 | (and c-auto-newline | |
131 | (not (c-in-literal)) | |
132 | (not (newline)))) | |
133 | ||
134 | (defsubst c-intersect-lists (list alist) | |
135 | ;; return the element of ALIST that matches the first element found | |
136 | ;; in LIST. Uses assq. | |
137 | (let (match) | |
138 | (while (and list | |
139 | (not (setq match (assq (car list) alist)))) | |
140 | (setq list (cdr list))) | |
141 | match)) | |
142 | ||
143 | (defsubst c-lookup-lists (list alist1 alist2) | |
144 | ;; first, find the first entry from LIST that is present in ALIST1, | |
145 | ;; then find the entry in ALIST2 for that entry. | |
146 | (assq (car (c-intersect-lists list alist1)) alist2)) | |
147 | ||
148 | (defsubst c-langelem-col (langelem &optional preserve-point) | |
149 | ;; convenience routine to return the column of langelem's relpos. | |
150 | ;; Leaves point at the relpos unless preserve-point is non-nil. | |
151 | (let ((here (point))) | |
152 | (goto-char (cdr langelem)) | |
153 | (prog1 (current-column) | |
154 | (if preserve-point | |
155 | (goto-char here)) | |
156 | ))) | |
157 | ||
158 | (defsubst c-update-modeline () | |
159 | ;; set the c-auto-hungry-string for the correct designation on the modeline | |
160 | (setq c-auto-hungry-string | |
161 | (if c-auto-newline | |
162 | (if c-hungry-delete-key "/ah" "/a") | |
163 | (if c-hungry-delete-key "/h" nil))) | |
164 | (force-mode-line-update)) | |
165 | ||
166 | (defsubst c-keep-region-active () | |
167 | ;; Do whatever is necessary to keep the region active in XEmacs. | |
168 | ;; Ignore byte-compiler warnings you might see. This is not needed | |
169 | ;; for Emacs. | |
170 | (and (boundp 'zmacs-region-stays) | |
171 | (setq zmacs-region-stays t))) | |
172 | ||
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173 | \f |
174 | (provide 'cc-defs) | |
175 | ;;; cc-defs.el ends here |