* ppexpand.el: New file.

2025-06-11 06:20:23 +02:00 · 2000-05-28 15:03:45 +00:00 · 2000-05-28 15:03:45 +00:00 · 752fd3b4a5
commit 752fd3b4a5
parent e11f8b42f2
1 changed files with 94 additions and 0 deletions
--- a/emacs/ppexpand.el
+++ b/emacs/ppexpand.el
@ -0,0 +1,94 @@
+;;; ppexpand.el --- temporarily expanding macros in a pretty way.
+
+;; Copyright (C) 2000 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 2, 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, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Author: Mikael Djurfeldt <djurfeldt@nada.kth.se>
+
+;;; Commentary:
+
+;; Commands for editing multiline ANSI C compatible string literals.
+
+;;; Code:
+(require 'cmacexp)
+
+(defvar if-mark "#if 0 /* PPEXPAND */")
+(defvar else-mark "#else /* PPEXPAND */")
+(defvar endif-mark "#endif /* PPEXPAND */")
+
+(define-key c-mode-map "\C-ce" 'ppexpand)
+
+(defun ppexpand (start end &optional undo)
+  "Expand C macros in the region, using the C preprocessor.
+The expanded code is run through the `indent' command and inserted
+into the program next to the original code, using an #if/#else/#endif
+construct.
+
+Given a prefix argument, it reverts the change, removing the
+#if/#else/#endif construct and the expanded code.
+
+`c-macro-preprocessor' specifies the preprocessor to use.
+Prompt for arguments to the preprocessor \(e.g. `-DDEBUG -I ./include')
+if the user option `c-macro-prompt-flag' is non-nil.
+
+Noninteractive args are START, END, UNDO.
+For use inside Lisp programs, see also `c-macro-expansion'."
+
+  (interactive (if current-prefix-arg
+		   (list nil nil t)
+		 (let ((pos1 (point))
+		       (pos2 (mark)))
+		   (if (< pos1 pos2)
+		       (list pos1 pos2 nil)
+		     (list pos2 pos1 nil)))))
+  (let ((inbuf (current-buffer)))
+    ;; Build the command string.
+    (if c-macro-prompt-flag
+	(setq c-macro-cppflags
+	      (read-string "Preprocessor arguments: "
+			   c-macro-cppflags)))
+    (if undo
+	(let ((pos (point)) if-pos else-pos endif-pos)
+	  (save-excursion
+	    (end-of-line)
+	    (if (not (and (setq if-pos (search-backward if-mark nil t))
+			  (setq else-pos (search-forward else-mark nil t))
+			  (setq endif-pos (search-forward endif-mark nil t))
+			  (<= if-pos pos)
+			  (< pos endif-pos)))
+		(error "Not in ppexpanded region"))
+	    (let ((orig (buffer-substring (+ if-pos (length if-mark) 1)
+					  (- else-pos (length else-mark)))))
+	      (delete-region if-pos (+ endif-pos 1))
+	      (insert orig))))
+      ;; Expand the macro.
+      (let* ((expansion (c-macro-expansion start end
+					   (concat c-macro-preprocessor " "
+						   c-macro-cppflags) t))
+	     (orig (buffer-substring start end)))
+	(setq expansion
+	      (with-temp-buffer
+		(insert expansion)
+		(call-process-region (point-min) (point-max) "indent"
+				     t		;delete the text
+				     t		;output --> current buffer
+				     )
+		(buffer-string)))
+	(delete-region start end)
+	(insert if-mark ?\n orig else-mark ?\n expansion endif-mark ?\n)))))