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108 lines
3.9 KiB
EmacsLisp
108 lines
3.9 KiB
EmacsLisp
;;; cmacexp.el --- C preprocessor macro expansion
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;; Copyright (C) 1988 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: c
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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
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; This package gives you the ability to run the C macro preprocessor
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;; on the current region, expanding macros within it. This can be useful
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;; when you're not sure of the value or expansion of such macros and want
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;; to make sure they're doing what you think they're doing.
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;;
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;; This package supports the following option variables:
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;;
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;; c-macro-preprocessor --- program to be used for macro expansion.
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;; c-macro-options --- command-line options to pass it.
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;;; Code:
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(defvar c-macro-preprocessor "/lib/cpp"
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"*Command to be used for C preprocessing.")
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(defvar c-macro-options nil
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"*List of options to use in C preprocessing.
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Each string in the list becomes a separate argument to the preprocessor.
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These arguments precede the filename.
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Use the `-I' option here to specify directories for header files.")
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(defun c-macro-expand (beg end)
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"Display the result of expanding all C macros occurring in the region.
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The expansion is entirely correct because it uses the C preprocessor.
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You can use the variables `c-macro-preprocessor' and `c-macro-options'
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to customize how preprocessing is done, or specify header file directories
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and macros to predefine."
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(interactive "r")
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(let ((outbuf (get-buffer-create "*Macroexpansion*"))
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(tempfile "%%macroexpand%%")
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expanded
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process
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last-needed)
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(setq expanded (expand-file-name tempfile))
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(save-excursion
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(set-buffer outbuf)
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(erase-buffer))
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(setq process (apply 'start-process "macros" outbuf c-macro-preprocessor
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c-macro-options))
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(set-process-sentinel process '(lambda (&rest x)))
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(save-restriction
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(widen)
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(save-excursion
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(goto-char beg)
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(beginning-of-line)
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(setq last-needed (point))
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(if (re-search-backward "^[ \t]*#" nil t)
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(progn
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;; Skip continued lines.
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(while (progn (end-of-line) (= (preceding-char) ?\\))
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(forward-line 1))
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;; Skip the last line of the macro definition we found.
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(forward-line 1)
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(setq last-needed (point)))))
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(write-region (point-min) last-needed expanded nil 'nomsg)
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;; Output comment ender in case last #-directive is inside a comment.
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;; Also, terminate any string that we are in.
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(write-region "*//*\"*/\n" nil expanded t 'nomsg)
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(write-region beg end (concat expanded "x") nil 'nomsg)
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(process-send-string process (concat "#include \"" tempfile "\"\n"))
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(process-send-string process "\n")
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(process-send-string process (concat "#include \"" tempfile "x\"\n"))
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(process-send-eof process)
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;; HPUX seems to want two eofs.
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(process-send-eof process))
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(while (eq (process-status process) 'run)
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(accept-process-output))
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(delete-file expanded)
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(delete-file (concat expanded "x"))
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(display-buffer outbuf)
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(save-excursion
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(set-buffer outbuf)
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(goto-char (point-max))
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(forward-line -1)
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(delete-region (point) (point-max))
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(re-search-backward "\n# 1 ")
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(forward-line 2)
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(while (eolp) (delete-char 1))
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(delete-region (point-min) (point)))
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(display-buffer outbuf)))
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;;; cmacexp.el ends here
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