-;;; cmacexp.el --- expand C macros in a region
-
-;; Copyright (C) 1992 Free Software Foundation, Inc.
-
-;; Author: Francesco Potorti` <pot@cnuce.cnr.it>
-;; Version: $Id: cmacexp.el,v 1.8 1994/02/07 05:39:56 rms Exp rms $
-;; Adapted-By: ESR
-;; Keywords: c
-
-;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.
-
-;;; Commentary:
-
-;; In C mode C-M-x is bound to c-macro-expand. The result of the
-;; expansion is put in a separate buffer. The buffer is put in
-;; view-mode if the Inge Frick's view.el is installed. A user option
-;; allows the window displaying the buffer to be optimally sized.
-;;
-;; When called with a C-u prefix, c-macro-expand replaces the selected
-;; region with the expansion. With two C-u's the user is offered to
-;; change the flags to the preprocessor (while the results of the
-;; expansion go to a separate buffer). Preprocessor arguments default
-;; to the last ones entered. Both the preprocessor name and the
-;; initial flag defaults can be set by the user. Setting
-;; c-macro-always-prompt to a non-nil value allows one to be always
-;; prompted for the flags, regardless of the prefix used.
-
-;; A c-macro-expansion function is provided for non-interactive use.
-;; A still experimental function c-macro-eval is provided. It aims at
-;; evaluating the contents of a region by using calc (by Dave
-;; Gillespie). Select a region and type C-x C-e (if you followed the
-;; suggestions in the INSTALLATION section) or type M-x c-ma RET v
-;; RET. If you have calc installed, the computed value of the
-;; expression will appear in the message area. If you give an
-;; interactive C-u prefix the computed value will be shown in signed,
-;; unsigned, hex and boolean representations. Two C-u's allow to
-;; change the preprocessor flags via prompt. c-macro-eval works well
-;; for constant expressions, but see the BUG section.
-
-;; A patch to calc 2.02 has been written by Dave Gillespie. It can
-;; be downloaded via anonymous ftp at fly.cnuce.cnr.it:pub/calc.diff.
-
-;; INSTALLATION ======================================================
-
-;; Put this file on your load-path, byte compile it for increased
-;; speed and put part or all of the following in your ~/.emacs file.
-
-;; To make a directory ~/emacs be in front of your load-path:
-;;(setq load-path (cons (expand-file-name "~/emacs") load-path))
-;;
-;; Suggested keybindings (work only in c-mode):
-;;(define-key c-mode-map "\C-\M-x" 'c-macro-expand)
-;;(define-key c-mode-map "\C-x\C-e" 'c-macro-eval)
-;;
-;; If you want the *Macroexpansion* window to be not higher than
-;; necessary:
-;;(setq c-macro-shrink-window-p t)
-;;
-;; If you use a preprocessor other than /lib/cpp (be careful to set a
-;; -C option or equivalent in order to make the preprocessor not to
-;; strip the comments):
-;;(setq c-macro-preprocessor "gpp -C")
-;;
-;; If you often use a particular set of flags, and want them to be
-;; the default:
-;;(setq c-macro-default-cppflags "-I /usr/include/local -DDEBUG"
-;;
-;; If you always want the "Preprocessor arguments: " prompt,
-;; regardless of the arguments provided:
-;;(setq c-macro-always-prompt-p t)
-;;
-;; If you want to experiment with the C constant expressions
-;; evaluation feature:
-;;(autoload 'c-macro-eval "cmacexp"
-;; "C constant expressions evaluation. Requires calc. Experimental." t)
-
-;; BUG REPORTS =======================================================
-
-;; Please report bugs, suggestions, complaints and so on to
-;; pot@cnuce.cnr.it (Francesco Potorti`).
-
-;; IMPROVEMENTS OVER emacs 18.xx cmacexp.el ==========================
-
-;; - A lot of user visible changes. See above.
-;; - #line directives are inserted, so __LINE__ and __FILE__ are
-;; correctly expanded. Works even with START inside a string, a
-;; comment or a region #ifdef'd away by cpp. cpp is invoked with -C,
-;; making comments visible in the expansion.
-;; - All work is done in core memory, no need for temporary files.
-;; - The /lib/cpp process is run synchronously. This fixes an
-;; infinite loop bug on Motorola Delta (cpp waiting forever for
-;; end-of-file, don't know why). Fixes a similar intermittent
-;; problem on SunOS 4.1.
-
-;; ACKNOWLEDGEMENTS ==================================================
-
-;; A lot of thanks to Don Maszle who did a great work of testing, bug
-;; reporting and suggestion of new features, to Inge Fricks for her
-;; help with view.el and to Dave Gillespie for his suggestions on
-;; calc's use. This work has been partially inspired by Don Maszle
-;; and Jonathan Segal's.
-
-;; By the way, I recommend you Inge Frick's view.el. It works like
-;; the standard view, but *it is not recursive* and has some more
-;; commands. Moreover it is a minor mode, so you preserve all your
-;; major mode keybindings (well, not always :). Mail me to obtain a
-;; copy, or get it by anonymous ftp in fly.cnuce.cnr.it:pub/view.el.
-
-;; BUGS ==============================================================
-
-;; calc 2.02 does not handle the C operators "->", ".", "*" (as a
-;; prefix), the composite assignement operators "+=" etc. It cannot
-;; handle the "," operator and will be confused by ";". Almost all
-;; these can be defined as no-ops using the Calc's Syntax Tables
-;; feature. The built-in calc functions will cause problems in
-;; certain circumstances. c-macro-eval behaves correctly only on
-;; expressions not containing such operators. Does not distinguish
-;; among integer and real division.
-
-;; If the start point of the region is inside a macro definition the
-;; macro expansion is often inaccurate.
-
-;;; Code:
-
-(defvar c-macro-shrink-window-p nil
- "*Non-nil means shrink the *Macroexpansion* window to fit its contents.")
-
-(defvar c-macro-always-prompt-p nil
- "*Non-nil means always prompt for preprocessor arguments.")
-
-(defvar c-macro-preprocessor "/lib/cpp -C" "\
-The preprocessor used by the cmacexp package.
-
-If you change this, be sure to preserve the -C (don't strip comments)
-option, or to set an equivalent one.")
-
-(defvar c-macro-default-cppflags ""
- "Default cpp flags used by c-macro-expand.")
-
-(defconst c-macro-buffer-name "*Macroexpansion*")
-
-(defun c-macro-expand (start end &optional flag) "\
-Expand all C macros occurring in the region using c-macro-preprocessor.
-Normally display output in temp buffer.
-Prefix arg means replace the region with it.
-Prompt for a string of arguments to the preprocessor, (e.g.
--DDEBUG -I ./include) when prefixed with two C-u's.
-
-It is intended for interactive use only.
-For non interactive use, see the c-macro-expansion function."
-
- (interactive "r\nP")
- (let* ((subst (and flag (not (equal flag '(16)))))
- (inbuf (current-buffer))
- (displaybuf (if subst
- (get-buffer c-macro-buffer-name)
- (get-buffer-create c-macro-buffer-name)))
- (expansion ""))
- ;; Build the command string.
- (if (or c-macro-always-prompt-p (equal flag '(16)))
- (setq c-macro-default-cppflags
- (read-string "Preprocessor arguments: "
- c-macro-default-cppflags)))
- ;; Decide where to display output.
- (if (and subst
- (and buffer-read-only (not inhibit-read-only))
- (not (eq inbuf displaybuf)))
- (progn
- (message
- "Buffer is read only: displaying expansion in alternate window")
- (sit-for 2)
- (setq subst nil)
- (or displaybuf
- (setq displaybuf (get-buffer-create c-macro-buffer-name)))))
- ;; Expand the macro and output it.
- (if (interactive-p) (message (c-macro-default-message)))
- (setq expansion
- (c-macro-expansion start end
- (concat c-macro-preprocessor " "
- c-macro-default-cppflags)))
- (message (concat (c-macro-default-message) "done"))
- (if subst
- (let ((exchange (= (point) start)))
- (delete-region start end)
- (insert expansion)
- (if exchange
- (exchange-point-and-mark)))
- (set-buffer displaybuf)
- (setq buffer-read-only nil)
- (buffer-flush-undo displaybuf)
- (erase-buffer)
- (insert expansion)
- (set-buffer-modified-p nil)
- (if (string= "" expansion)
- (message "Null expansion")
- (c-macro-display-buffer inbuf))
- (setq buffer-read-only t)
- (bury-buffer displaybuf))))
-
-
-;; Display the current buffer in a window which is either just large
-;; enough to contain the entire buffer, or half the size of the
-;; screen, whichever is smaller. Put the current buffer in view-mode
-;; if the Inge Frick's view-mode is installed, with buffer to return
-;; to set to RETBUF (if sensible). Do not select the new window.
-;;
-;; Several factors influence window resizing so that the window is
-;; sized optimally if it is created anew, and so that it is messed
-;; with minimally if it has been created by the user. If the window
-;; chosen for display exists already but contains something else, the
-;; window is not re-sized. If the window already contains the current
-;; buffer, it is never shrunk, but possibly expanded. Finally, if the
-;; variable c-macro-shrink-window-p is nil the window size is *never*
-;; changed.
-(defun c-macro-display-buffer (retbuf)
-
- (goto-char (point-min))
- (c-mode)
- (require 'view) ;load view.el
- (let ((oldwinheight (window-height))
- (alreadythere ;the window was already there
- (get-buffer-window (current-buffer)))
- (popped nil) ;the window popped changing the layout
- (niceview ;is this Inge Fricks's view.el?
- (boundp 'view-kill-when-finished)))
-
- (or alreadythere
- (progn
- (display-buffer (current-buffer) t)
- (setq popped (/= oldwinheight (window-height)))))
- (if niceview
- (view-mode 1)) ;set view mode
- (if (and c-macro-shrink-window-p ;user wants fancy shrinking :\)
- (or alreadythere popped))
- ;; Enlarge up to half screen, or shrink properly.
- (let ((oldwin (selected-window))
- (minheight 0)
- (maxheight 0))
- (save-excursion
- (select-window (get-buffer-window (current-buffer)))
- (setq minheight (if alreadythere
- (window-height)
- window-min-height))
- (setq maxheight (/ (screen-height) 2))
- (enlarge-window (- (min maxheight
- (max minheight
- (+ 2 (vertical-motion 1000000))))
- (window-height)))
- (goto-char (point-min))
- (select-window oldwin))))))
-
-
-(defun c-macro-expansion (start end cppcommand) "\
-Expands the region between START and END in the current buffer using
-the shell command CPPCOMMAND (e.g. \"/lib/cpp -C -DDEBUG\"). Be sure
-to use a -C (don't strip comments) or equivalent option.
-Returns the output as a string."
-
-;; Copy the current buffer's contents to a temporary hidden buffer.
-;; Delete from END to end of buffer. Insert a preprocessor #line
-;; directive at START and after each #endif following START that are
-;; not inside a comment or a string. Put all the strings thus
-;; inserted (without the "line" substring) in a list named linelist.
-;; If START is inside a comment, prepend "*/" and append "/*" to the
-;; #line directive. If inside a string, prepend and append "\"".
-;; Preprocess the buffer contents, then look for all the lines stored
-;; in linelist starting from end of buffer. The last line so found is
-;; where START was, so return the substring from point to end of
-;; buffer.
- (let ((inbuf (current-buffer))
- (outbuf (get-buffer-create " *C Macro Expansion*"))
- (filename (if (and buffer-file-name
- (string-match (regexp-quote default-directory)
- buffer-file-name))
- (substring buffer-file-name (match-end 0))
- (buffer-name)))
- (linenum 0)
- (linelist ()))
- (unwind-protect
- (save-excursion
- (save-restriction
- (widen)
- (set-buffer outbuf)
- (setq buffer-read-only nil)
- (erase-buffer)
- (set-syntax-table c-mode-syntax-table)
- (insert-buffer-substring inbuf 1 end))
-
- ;; We have copied inbuf to outbuf. Point is at end of
- ;; outbuf. Insert a space at the end, so cpp can correctly
- ;; parse a token ending at END.
-
- (insert " ")
-
- ;; Now we insert the #line directives after all #endif or
- ;; #else following START.
- ;(switch-to-buffer outbuf) (debug) ;debugging instructions
- (while (re-search-backward "\n#\\(endif\\|else\\)\\>" start 'move)
- (if (equal (nthcdr 3 (parse-partial-sexp 1 (point)))
- '(nil nil nil 0)) ;neither in string nor in
- ;comment nor after quote
- (progn
- (goto-char (match-end 0))
- (setq linenum (count-lines 1 (point)))
- (setq linelist
- (cons (format "\n# %d \"%s\"\n" linenum filename)
- linelist))
- (insert (car linelist))
- (skip-chars-backward "^#")
- (insert "line")
- (goto-char (match-beginning 0)))))
-
- ;; We are at START. Insert the first #line directive. This
- ;; must work even inside a string or comment, or after a
- ;; quote.
- (setq linenum (+ (count-lines 1 (point))
- (if (bolp) 1 0)))
- (setq linelist
- (cons
- (let* ((startstat (parse-partial-sexp 1 start))
- (startinstring (nth 3 startstat))
- (startincomment (nth 4 startstat))
- (startafterquote (nth 5 startstat)))
- (concat (if startafterquote " ")
- (cond (startinstring "\"") (startincomment "*/"))
- (format "\n# %d \"%s\"\n" linenum filename)
- (cond (startinstring "\"") (startincomment "/*"))
- (if startafterquote "\\")))
- linelist))
- (insert (car linelist))
- (skip-chars-backward "^#")
- (insert "line")
-
- ;; Call the preprocessor.
- (call-process-region 1 (point-max) "sh" t t nil "-c"
- (concat cppcommand " 2>/dev/null"))
-
- ;; Look for the `# nn "file.c"' lines from the last to the first
- ;; and delete them.
- (setq linelist (reverse linelist))
- (while (progn
- (if (search-backward (car linelist) nil t)
- (replace-match ""))
- (setq linelist (cdr linelist))))
-
- ;; Compute the return value, keeping in account the space
- ;; inserted at the end of the buffer.
- (buffer-substring (point) (max (point) (- (point-max) 1))))
-
- ;; Cleanup.
- (kill-buffer outbuf))))
-
-
-;; Experimental. With an argument, print signed, unsigned, hex and
-;; boolean representations.
-(defun c-macro-eval (start end &optional flag) "\
-Expand region using cpp and evaluate it using calc.
-Interactively print value in minibuffer and push it on the kill ring.
-With a C-u argument shows the evaluation in a variety of formats.
-With two C-u's prompts the user for a string of flags to the preprocessor.
-
-Non interactively returns value of region between START and END
-as a string. Several formats are used if optional FLAG is non-nil."
-
- (interactive "r\nP")
- (or (fboundp 'calc-eval)
- (require 'calc))
- (if (or c-macro-always-prompt-p (equal flag '(16)))
- (setq c-macro-default-cppflags
- (read-string "Preprocessor arguments: "
- c-macro-default-cppflags)))
-
- ;; Expand the region.
- (if (interactive-p) (message (c-macro-default-message)))
- (let ((evaluation
- (c-macro-expansion start end
- (concat c-macro-preprocessor " "
- c-macro-default-cppflags)))
- (evalbuf (get-buffer-create " *Macro Evaluation*")))
- (unwind-protect
- (save-excursion
- (set-buffer evalbuf)
- (setq buffer-read-only nil)
- (erase-buffer)
- (insert evaluation)
-
- ;; Evaluate expression(s).
- (if (interactive-p)
- (message "Invoking calc..."))
- (setq evaluation
- (let ((calc-eval-error t))
- (calc-eval (list (buffer-string) 'calc-language 'c))))
- (erase-buffer)
- (cond
- (flag
- (insert (calc-eval (list evaluation
- 'calc-language 'c
- 'calc-simplify-mode 'binary))
- "(u)" " == "
- (calc-eval (list evaluation
- 'calc-language 'c
- 'calc-word-size (- calc-word-size)
- 'calc-simplify-mode 'binary))
- "(d)" " == "
- (calc-eval (list evaluation
- 'calc-language 'c
- 'calc-number-radix 16
- 'calc-simplify-mode 'binary))
- "(x)")
- (save-excursion
- (insert " == " (calc-eval (list evaluation
- 'calc-language 'c
- 'calc-number-radix 16
- 'calc-simplify-mode 'binary))))
- (while (re-search-forward "0x\\([^,]+\\)\\(, \\|\\'\\)" nil t)
- (if (string= "0"
- (buffer-substring (match-beginning 1)
- (match-end 1)))
- (replace-match "FALSE\\2")
- (replace-match "TRUE\\2"))))
- (t
- (insert evaluation)))
-
- ;; Output the evaluation.
- (if (interactive-p)
- (progn
- (copy-region-as-kill 1 (point-max))
- (message (buffer-string)))
- (buffer-string)))
- (kill-buffer evalbuf))))
-
-(defun c-macro-default-message ()
- (format "Invoking %s%s%s on region..."
- c-macro-preprocessor
- (if (string= "" c-macro-default-cppflags) "" " ")
- c-macro-default-cppflags))
-
-(provide 'cmacexp)
-
-;;; cmacexp.el ends here.
+;;; cmacexp.el --- expand C macros in a region
+
+;; Copyright (C) 1992, 1994, 1996 Free Software Foundation, Inc.
+
+;; Author: Francesco Potorti` <pot@cnuce.cnr.it>
+;; Adapted-By: ESR
+;; Keywords: c
+
+;; 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.
+
+;; USAGE =============================================================
+
+;; In C mode C-C C-e is bound to c-macro-expand. The result of the
+;; expansion is put in a separate buffer. A user option allows the
+;; window displaying the buffer to be optimally sized.
+;;
+;; When called with a C-u prefix, c-macro-expand replaces the selected
+;; region with the expansion. Both the preprocessor name and the
+;; initial flag can be set by the user. If c-macro-prompt-flag is set
+;; to a non-nil value the user is offered to change the options to the
+;; preprocessor each time c-macro-expand is invoked. Preprocessor
+;; arguments default to the last ones entered. If c-macro-prompt-flag
+;; is nil, one must use M-x set-variable to set a different value for
+;; c-macro-cppflags.
+
+;; A c-macro-expansion function is provided for non-interactive use.
+
+;; INSTALLATION ======================================================
+
+;; Put the following in your ~/.emacs file.
+
+;; If you want the *Macroexpansion* window to be not higher than
+;; necessary:
+;;(setq c-macro-shrink-window-flag t)
+;;
+;; If you use a preprocessor other than /lib/cpp (be careful to set a
+;; -C option or equivalent in order to make the preprocessor not to
+;; strip the comments):
+;;(setq c-macro-preprocessor "gpp -C")
+;;
+;; If you often use a particular set of flags:
+;;(setq c-macro-cppflags "-I /usr/include/local -DDEBUG"
+;;
+;; If you want the "Preprocessor arguments: " prompt:
+;;(setq c-macro-prompt-flag t)
+
+;; BUG REPORTS =======================================================
+
+;; Please report bugs, suggestions, complaints and so on to
+;; pot@cnuce.cnr.it (Francesco Potorti`).
+
+;; IMPROVEMENTS OVER emacs 18.xx cmacexp.el ==========================
+
+;; - A lot of user and programmer visible changes. See above.
+;; - #line directives are inserted, so __LINE__ and __FILE__ are
+;; correctly expanded. Works even with START inside a string, a
+;; comment or a region #ifdef'd away by cpp. cpp is invoked with -C,
+;; making comments visible in the expansion.
+;; - All work is done in core memory, no need for temporary files.
+
+;; ACKNOWLEDGEMENTS ==================================================
+
+;; A lot of thanks to Don Maszle who did a great work of testing, bug
+;; reporting and suggestion of new features. This work has been
+;; partially inspired by Don Maszle and Jonathan Segal's.
+
+;; BUGS ==============================================================
+
+;; If the start point of the region is inside a macro definition the
+;; macro expansion is often inaccurate.
+
+
+(require 'cc-mode)
+
+(provide 'cmacexp)
+
+(defgroup c-macro nil
+ "Expand C macros in a region."
+ :group 'c)
+
+
+(defcustom c-macro-shrink-window-flag nil
+ "*Non-nil means shrink the *Macroexpansion* window to fit its contents."
+ :type 'boolean
+ :group 'c-macro)
+
+(defcustom c-macro-prompt-flag nil
+ "*Non-nil makes `c-macro-expand' prompt for preprocessor arguments."
+ :type 'boolean
+ :group 'c-macro)
+
+(defcustom c-macro-preprocessor
+ ;; Cannot rely on standard directory on MS-DOS to find CPP.
+ (cond ((eq system-type 'ms-dos) "cpp -C")
+ ;; Solaris has it in an unusual place.
+ ((and (string-match "^[^-]*-[^-]*-\\(solaris\\|sunos5\\)"
+ system-configuration)
+ (file-exists-p "/opt/SUNWspro/SC3.0.1/bin/acomp"))
+ "/opt/SUNWspro/SC3.0.1/bin/acomp -C -E")
+ (t "/lib/cpp -C"))
+ "The preprocessor used by the cmacexp package.
+
+If you change this, be sure to preserve the `-C' (don't strip comments)
+option, or to set an equivalent one."
+ :type 'string
+ :group 'c-macro)
+
+(defcustom c-macro-cppflags ""
+ "*Preprocessor flags used by `c-macro-expand'."
+ :type 'string
+ :group 'c-macro)
+
+(defconst c-macro-buffer-name "*Macroexpansion*")
+
+;;;###autoload
+(defun c-macro-expand (start end subst)
+ "Expand C macros in the region, using the C preprocessor.
+Normally display output in temp buffer, but
+prefix arg means replace the region with it.
+
+`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, SUBST.
+For use inside Lisp programs, see also `c-macro-expansion'."
+
+ (interactive "r\nP")
+ (let ((inbuf (current-buffer))
+ (displaybuf (if subst
+ (get-buffer c-macro-buffer-name)
+ (get-buffer-create c-macro-buffer-name)))
+ (expansion ""))
+ ;; Build the command string.
+ (if c-macro-prompt-flag
+ (setq c-macro-cppflags
+ (read-string "Preprocessor arguments: "
+ c-macro-cppflags)))
+ ;; Decide where to display output.
+ (if (and subst
+ (and buffer-read-only (not inhibit-read-only))
+ (not (eq inbuf displaybuf)))
+ (progn
+ (message
+ "Buffer is read only: displaying expansion in alternate window")
+ (sit-for 2)
+ (setq subst nil)
+ (or displaybuf
+ (setq displaybuf (get-buffer-create c-macro-buffer-name)))))
+ ;; Expand the macro and output it.
+ (setq expansion (c-macro-expansion start end
+ (concat c-macro-preprocessor " "
+ c-macro-cppflags) t))
+ (if subst
+ (let ((exchange (= (point) start)))
+ (delete-region start end)
+ (insert expansion)
+ (if exchange
+ (exchange-point-and-mark)))
+ (set-buffer displaybuf)
+ (setq buffer-read-only nil)
+ (buffer-disable-undo displaybuf)
+ (erase-buffer)
+ (insert expansion)
+ (set-buffer-modified-p nil)
+ (if (string= "" expansion)
+ (message "Null expansion")
+ (c-macro-display-buffer))
+ (setq buffer-read-only t)
+ (setq buffer-auto-save-file-name nil)
+ (bury-buffer displaybuf))))
+
+
+;; Display the current buffer in a window which is either just large
+;; enough to contain the entire buffer, or half the size of the
+;; screen, whichever is smaller. Do not select the new
+;; window.
+;;
+;; Several factors influence window resizing so that the window is
+;; sized optimally if it is created anew, and so that it is messed
+;; with minimally if it has been created by the user. If the window
+;; chosen for display exists already but contains something else, the
+;; window is not re-sized. If the window already contains the current
+;; buffer, it is never shrunk, but possibly expanded. Finally, if the
+;; variable c-macro-shrink-window-flag is nil the window size is *never*
+;; changed.
+(defun c-macro-display-buffer ()
+ (goto-char (point-min))
+ (c-mode)
+ (let ((oldwinheight (window-height))
+ (alreadythere ;the window was already there
+ (get-buffer-window (current-buffer)))
+ (popped nil)) ;the window popped changing the layout
+ (or alreadythere
+ (progn
+ (display-buffer (current-buffer) t)
+ (setq popped (/= oldwinheight (window-height)))))
+ (if (and c-macro-shrink-window-flag ;user wants fancy shrinking :\)
+ (or alreadythere popped))
+ ;; Enlarge up to half screen, or shrink properly.
+ (let ((oldwin (selected-window))
+ (minheight 0)
+ (maxheight 0))
+ (save-excursion
+ (select-window (get-buffer-window (current-buffer)))
+ (setq minheight (if alreadythere
+ (window-height)
+ window-min-height))
+ (setq maxheight (/ (frame-height) 2))
+ (enlarge-window (- (min maxheight
+ (max minheight
+ (+ 2 (vertical-motion (point-max)))))
+ (window-height)))
+ (goto-char (point-min))
+ (select-window oldwin))))))
+
+
+(defun c-macro-expansion (start end cppcommand &optional display)
+ "Run a preprocessor on region and return the output as a string.
+Expand the region between START and END in the current buffer using
+the shell command CPPCOMMAND (e.g. \"/lib/cpp -C -DDEBUG\").
+Be sure to use a -C (don't strip comments) or equivalent option.
+Optional arg DISPLAY non-nil means show messages in the echo area."
+
+;; Copy the current buffer's contents to a temporary hidden buffer.
+;; Delete from END to end of buffer. Insert a preprocessor #line
+;; directive at START and after each #endif following START that are
+;; not inside a comment or a string. Put all the strings thus
+;; inserted (without the "line" substring) in a list named linelist.
+;; If START is inside a comment, prepend "*/" and append "/*" to the
+;; #line directive. If inside a string, prepend and append "\"".
+;; Preprocess the buffer contents, then look for all the lines stored
+;; in linelist starting from end of buffer. The last line so found is
+;; where START was, so return the substring from point to end of
+;; buffer.
+ (let ((inbuf (current-buffer))
+ (outbuf (get-buffer-create " *C Macro Expansion*"))
+ (filename (if (and buffer-file-name
+ (string-match (regexp-quote default-directory)
+ buffer-file-name))
+ (substring buffer-file-name (match-end 0))
+ (buffer-name)))
+ (mymsg (format "Invoking %s%s%s on region..."
+ c-macro-preprocessor
+ (if (string= "" c-macro-cppflags) "" " ")
+ c-macro-cppflags))
+ (uniquestring "??? !!! ??? start of c-macro expansion ??? !!! ???")
+ (startlinenum 0)
+ (linenum 0)
+ (startstat ())
+ (startmarker "")
+ (exit-status 0)
+ (tempname (make-temp-name
+ (expand-file-name "cmacexp"
+ temporary-file-directory))))
+ (unwind-protect
+ (save-excursion
+ (save-restriction
+ (widen)
+ (let ((in-syntax-table (syntax-table)))
+ (set-buffer outbuf)
+ (setq buffer-read-only nil)
+ (erase-buffer)
+ (set-syntax-table in-syntax-table))
+ (insert-buffer-substring inbuf 1 end))
+
+ ;; We have copied inbuf to outbuf. Point is at end of
+ ;; outbuf. Inset a newline at the end, so cpp can correctly
+ ;; parse a token ending at END.
+ (insert "\n")
+
+ ;; Save sexp status and line number at START.
+ (setq startstat (parse-partial-sexp 1 start))
+ (setq startlinenum (+ (count-lines 1 (point))
+ (if (bolp) 1 0)))
+
+ ;; Now we insert the #line directives after all #endif or
+ ;; #else following START going backward, so the lines we
+ ;; insert don't change the line numbers.
+ ;(switch-to-buffer outbuf) (debug) ;debugging instructions
+ (goto-char (point-max))
+ (while (re-search-backward "\n#\\(endif\\|else\\)\\>" start 'move)
+ (if (equal (nthcdr 3 (parse-partial-sexp start (point)
+ nil nil startstat))
+ '(nil nil nil 0 nil)) ;neither in string nor in
+ ;comment nor after quote
+ (progn
+ (goto-char (match-end 0))
+ (setq linenum (+ startlinenum
+ (count-lines start (point))))
+ (insert (format "\n#line %d \"%s\"\n" linenum filename))
+ (goto-char (match-beginning 0)))))
+
+ ;; Now we are at START. Insert the first #line directive.
+ ;; This must work even inside a string or comment, or after a
+ ;; quote.
+ (let* ((startinstring (nth 3 startstat))
+ (startincomment (nth 4 startstat))
+ (startafterquote (nth 5 startstat))
+ (startinbcomment (nth 7 startstat)))
+ (insert (if startafterquote " " "")
+ (cond (startinstring
+ (char-to-string startinstring))
+ (startincomment "*/")
+ (""))
+ (setq startmarker
+ (concat "\n" uniquestring
+ (cond (startinstring
+ (char-to-string startinstring))
+ (startincomment "/*")
+ (startinbcomment "//"))
+ (if startafterquote "\\")))
+ (format "\n#line %d \"%s\"\n" startlinenum filename)))
+
+ ;; Call the preprocessor.
+ (if display (message mymsg))
+ (setq exit-status
+ (call-process-region 1 (point-max)
+ shell-file-name
+ t (list t tempname) nil "-c"
+ cppcommand))
+ (if display (message (concat mymsg "done")))
+ (if (= (buffer-size) 0)
+ ;; Empty output is normal after a fatal error.
+ (insert "\nPreprocessor produced no output\n")
+ ;; Find and delete the mark of the start of the expansion.
+ ;; Look for `# nn "file.c"' lines and delete them.
+ (goto-char (point-min))
+ (search-forward startmarker)
+ (delete-region 1 (point)))
+ (while (re-search-forward (concat "^# [0-9]+ \""
+ (regexp-quote filename)
+ "\"") nil t)
+ (beginning-of-line)
+ (let ((beg (point)))
+ (forward-line 1)
+ (delete-region beg (point))))
+
+ ;; If CPP got errors, show them at the beginning.
+ ;; MS-DOS shells don't return the exit code of their children.
+ ;; Look at the size of the error message file instead, but
+ ;; don't punish those MS-DOS users who have a shell that does
+ ;; return an error code.
+ (or (and (or (not (boundp 'msdos-shells))
+ (not (member (file-name-nondirectory shell-file-name)
+ msdos-shells)))
+ (eq exit-status 0))
+ (zerop (nth 7 (file-attributes (expand-file-name tempname))))
+ (progn
+ (goto-char (point-min))
+ ;; Put the messages inside a comment, so they won't get in
+ ;; the way of font-lock, highlighting etc.
+ (insert
+ (format "/* Preprocessor terminated with status %s\n\n Messages from `%s\':\n\n"
+ exit-status cppcommand))
+ (goto-char (+ (point)
+ (nth 1 (insert-file-contents tempname))))
+ (insert "\n\n*/\n")))
+ (delete-file tempname)
+
+ ;; Compute the return value, keeping in account the space
+ ;; inserted at the end of the buffer.
+ (buffer-substring 1 (max 1 (- (point-max) 1))))
+
+ ;; Cleanup.
+ (kill-buffer outbuf))))
+
+;;; cmacexp.el ends here
HCoop / bpt / emacs.git / blobdiff