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| -rw-r--r-- | lisp/progmodes/cmacexp.el | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/lisp/progmodes/cmacexp.el b/lisp/progmodes/cmacexp.el new file mode 100644 index 00000000000..ae77749a020 --- /dev/null +++ b/lisp/progmodes/cmacexp.el @@ -0,0 +1,83 @@ +;; C macro expansion +;; Copyright (C) 1988 Free Software Foundation, Inc. + +;; This file is part of GNU Emacs. + +;; GNU Emacs is free software; you can redistribute it and/or modify +;; it under the terms of the GNU General Public License as published by +;; the Free Software Foundation; either version 1, or (at your option) +;; any later version. + +;; GNU Emacs is distributed in the hope that it will be useful, +;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;; GNU General Public License for more details. + +;; You should have received a copy of the GNU General Public License +;; along with GNU Emacs; see the file COPYING. If not, write to +;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + + +(defvar c-macro-preprocessor "/lib/cpp" + "*Command to be used for C preprocessing.") + +(defvar c-macro-options nil + "*List of options to use in C preprocessing. +Each string in the list becomes a separate argument to the preprocessor. +These arguments precede the filename. +Use the `-I' option here to specify directories for header files.") + +(defun c-macro-expand (beg end) + "Display the result of expanding all C macros occurring in the region. +The expansion is entirely correct because it uses the C preprocessor. +You can use the variables `c-macro-preprocessor' and `c-macro-options' +to customize how preprocessing is done, or specify header file directories." + (interactive "r") + (let ((outbuf (get-buffer-create "*Macroexpansion*")) + (tempfile "%%macroexpand%%") + process + last-needed) + (save-excursion + (set-buffer outbuf) + (erase-buffer)) + (setq process (apply 'start-process "macros" outbuf c-macro-preprocessor + c-macro-options)) + (set-process-sentinel process '(lambda (&rest x))) + (save-restriction + (widen) + (save-excursion + (goto-char beg) + (beginning-of-line) + (setq last-needed (point)) + (if (re-search-backward "^[ \t]*#" nil t) + (progn + ;; Skip continued lines. + (while (progn (end-of-line) (= (preceding-char) ?\\)) + (forward-line 1)) + ;; Skip the last line of the macro definition we found. + (forward-line 1) + (setq last-needed (point))))) + (write-region (point-min) last-needed tempfile nil 'nomsg) + ;; Output comment ender in case last #-directive is inside a comment. + ;; Also, terminate any string that we are in. + (write-region "*//*\"*/\n" nil tempfile t 'nomsg) + (write-region beg end (concat tempfile "x") nil 'nomsg) + (process-send-string process (concat "#include \"" tempfile "\"\n")) + (process-send-string process "\n") + (process-send-string process (concat "#include \"" tempfile "x\"\n")) + (process-send-eof process)) + (while (eq (process-status process) 'run) + (accept-process-output)) + (delete-file tempfile) + (delete-file (concat tempfile "x")) + (display-buffer outbuf) + (save-excursion + (set-buffer outbuf) + (goto-char (point-max)) + (forward-line -1) + (delete-region (point) (point-max)) + (re-search-backward "\n# 1 ") + (forward-line 2) + (while (eolp) (delete-char 1)) + (delete-region (point-min) (point))) + (display-buffer outbuf))) |