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1 | ;;; ppexpand.el --- temporarily expanding macros in a pretty way. |
2 | ||
6e7d5622 | 3 | ;; Copyright (C) 2000, 2006 Free Software Foundation, Inc. |
752fd3b4 | 4 | |
53befeb7 NJ |
5 | ;;;; This library is free software; you can redistribute it and/or |
6 | ;;;; modify it under the terms of the GNU Lesser General Public | |
7 | ;;;; License as published by the Free Software Foundation; either | |
8 | ;;;; version 3 of the License, or (at your option) any later version. | |
9 | ;;;; | |
10 | ;;;; This library is distributed in the hope that it will be useful, | |
11 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | ;;;; Lesser General Public License for more details. | |
14 | ;;;; | |
15 | ;;;; You should have received a copy of the GNU Lesser General Public | |
16 | ;;;; License along with this library; if not, write to the Free | |
17 | ;;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | ;;;; 02111-1307 USA | |
752fd3b4 MD |
19 | |
20 | ;;; Author: Mikael Djurfeldt <djurfeldt@nada.kth.se> | |
21 | ||
22 | ;;; Commentary: | |
23 | ||
24 | ;; Commands for editing multiline ANSI C compatible string literals. | |
25 | ||
26 | ;;; Code: | |
27 | (require 'cmacexp) | |
28 | ||
29 | (defvar if-mark "#if 0 /* PPEXPAND */") | |
30 | (defvar else-mark "#else /* PPEXPAND */") | |
31 | (defvar endif-mark "#endif /* PPEXPAND */") | |
32 | ||
33 | (define-key c-mode-map "\C-ce" 'ppexpand) | |
34 | ||
35 | (defun ppexpand (start end &optional undo) | |
36 | "Expand C macros in the region, using the C preprocessor. | |
37 | The expanded code is run through the `indent' command and inserted | |
38 | into the program next to the original code, using an #if/#else/#endif | |
39 | construct. | |
40 | ||
41 | Given a prefix argument, it reverts the change, removing the | |
42 | #if/#else/#endif construct and the expanded code. | |
43 | ||
44 | `c-macro-preprocessor' specifies the preprocessor to use. | |
45 | Prompt for arguments to the preprocessor \(e.g. `-DDEBUG -I ./include') | |
46 | if the user option `c-macro-prompt-flag' is non-nil. | |
47 | ||
48 | Noninteractive args are START, END, UNDO. | |
49 | For use inside Lisp programs, see also `c-macro-expansion'." | |
50 | ||
51 | (interactive (if current-prefix-arg | |
52 | (list nil nil t) | |
53 | (let ((pos1 (point)) | |
54 | (pos2 (mark))) | |
55 | (if (< pos1 pos2) | |
56 | (list pos1 pos2 nil) | |
57 | (list pos2 pos1 nil))))) | |
58 | (let ((inbuf (current-buffer))) | |
59 | ;; Build the command string. | |
60 | (if c-macro-prompt-flag | |
61 | (setq c-macro-cppflags | |
62 | (read-string "Preprocessor arguments: " | |
63 | c-macro-cppflags))) | |
64 | (if undo | |
65 | (let ((pos (point)) if-pos else-pos endif-pos) | |
66 | (save-excursion | |
67 | (end-of-line) | |
68 | (if (not (and (setq if-pos (search-backward if-mark nil t)) | |
69 | (setq else-pos (search-forward else-mark nil t)) | |
70 | (setq endif-pos (search-forward endif-mark nil t)) | |
71 | (<= if-pos pos) | |
72 | (< pos endif-pos))) | |
73 | (error "Not in ppexpanded region")) | |
74 | (let ((orig (buffer-substring (+ if-pos (length if-mark) 1) | |
75 | (- else-pos (length else-mark))))) | |
76 | (delete-region if-pos (+ endif-pos 1)) | |
77 | (insert orig)))) | |
78 | ;; Expand the macro. | |
79 | (let* ((expansion (c-macro-expansion start end | |
80 | (concat c-macro-preprocessor " " | |
81 | c-macro-cppflags) t)) | |
82 | (orig (buffer-substring start end))) | |
83 | (setq expansion | |
84 | (with-temp-buffer | |
85 | (insert expansion) | |
86 | (call-process-region (point-min) (point-max) "indent" | |
87 | t ;delete the text | |
88 | t ;output --> current buffer | |
89 | ) | |
90 | (buffer-string))) | |
91 | (delete-region start end) | |
92 | (insert if-mark ?\n orig else-mark ?\n expansion endif-mark ?\n))))) |