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[Emacs-diffs] Changes to emacs/lisp/emacs-lisp/re-builder.el [gnus-5_10-


From: Miles Bader
Subject: [Emacs-diffs] Changes to emacs/lisp/emacs-lisp/re-builder.el [gnus-5_10-branch]
Date: Sat, 04 Sep 2004 08:44:07 -0400

Index: emacs/lisp/emacs-lisp/re-builder.el
diff -c /dev/null emacs/lisp/emacs-lisp/re-builder.el:1.16.2.1
*** /dev/null   Sat Sep  4 12:01:31 2004
--- emacs/lisp/emacs-lisp/re-builder.el Sat Sep  4 12:01:09 2004
***************
*** 0 ****
--- 1,690 ----
+ ;;; re-builder.el --- building Regexps with visual feedback
+ 
+ ;; Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
+ 
+ ;; Author: Detlev Zundel <address@hidden>
+ ;; Keywords: matching, lisp, tools
+ 
+ ;; 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.
+ 
+ ;;; Commentary:
+ 
+ ;; When I have to come up with regular expressions that are more
+ ;; complex than simple string matchers, especially if they contain sub
+ ;; expressions, I find myself spending quite some time in the
+ ;; `development cycle'.  `re-builder' aims to shorten this time span
+ ;; so I can get on with the more interesting bits.
+ 
+ ;; With it you can have immediate visual feedback about how well the
+ ;; regexp behaves to your expectations on the intended data.
+ 
+ ;; When called up `re-builder' attaches itself to the current buffer
+ ;; which becomes its target buffer, where all the matching is done.
+ ;; The active window is split so you have a view on the data while
+ ;; authoring the RE.  If the edited expression is valid the matches in
+ ;; the target buffer are marked automatically with colored overlays
+ ;; (for non-color displays see below) giving you feedback over the
+ ;; extents of the matched (sub) expressions.  The (non-)validity is
+ ;; shown only in the modeline without throwing the errors at you.  If
+ ;; you want to know the reason why RE Builder considers it as invalid
+ ;; call `reb-force-update' ("\C-c\C-u") which should reveal the error.
+ 
+ ;; The target buffer can be changed with `reb-change-target-buffer'
+ ;; ("\C-c\C-b").  Changing the target buffer automatically removes
+ ;; the overlays from the old buffer and displays the new one in the
+ ;; target window.
+ 
+ ;; The `re-builder' keeps the focus while updating the matches in the
+ ;; target buffer so corrections are easy to incorporate.  If you are
+ ;; satisfied with the result you can paste the RE to the kill-ring
+ ;; with `reb-copy' ("\C-c\C-w"), quit the `re-builder' ("\C-c\C-q")
+ ;; and use it wherever you need it.
+ 
+ ;; As the automatic updates can take some time on large buffers, they
+ ;; can be limited by `reb-auto-match-limit' so that they should not
+ ;; have a negative impact on the editing.  Setting it to nil makes
+ ;; even the auto updates go all the way.  Forcing an update overrides
+ ;; this limit allowing an easy way to see all matches.
+ 
+ ;; Currently `re-builder' understands four different forms of input,
+ ;; namely `read', `string', `sregex' and `lisp-re' syntax.  Read
+ ;; syntax and string syntax are both delimited by `"'s and behave
+ ;; according to their name.  With the `string' syntax there's no need
+ ;; to escape the backslashes and double quotes simplifying the editing
+ ;; somewhat.  The other two allow editing of symbolic regular
+ ;; expressions supported by the packages of the same name.  (`lisp-re'
+ ;; is a package by me and its support may go away as it is nearly the
+ ;; same as the `sregex' package in Emacs)
+ 
+ ;; Editing symbolic expressions is done through a major mode derived
+ ;; from `emacs-lisp-mode' so you'll get all the good stuff like
+ ;; automatic indentation and font-locking etc.
+ 
+ ;; When editing a symbolic regular expression, only the first
+ ;; expression in the RE Builder buffer is considered, which helps
+ ;; limiting the extent of the expression like the `"'s do for the text
+ ;; modes.  For the `sregex' syntax the function `sregex' is applied to
+ ;; the evaluated expression read.  So you can use quoted arguments
+ ;; with something like '("findme") or you can construct arguments to
+ ;; your hearts delight with a valid ELisp expression.  (The compiled
+ ;; string form will be copied by `reb-copy')  If you want to take
+ ;; a glance at the corresponding string you can temporarily change the
+ ;; input syntax.
+ 
+ ;; Changing the input syntax is transparent (for the obvious exception
+ ;; non-symbolic -> symbolic) so you can change your mind as often as
+ ;; you like.
+ 
+ ;; There is also a shortcut function for toggling the
+ ;; `case-fold-search' variable in the target buffer with an immediate
+ ;; update.
+ 
+ 
+ ;; Q: But what if my display cannot show colored overlays?
+ ;; A: Then the cursor will flash around the matched text making it stand
+ ;;    out.
+ 
+ ;; Q: But how can I then make out the sub-expressions?
+ ;; A: Thats where the `sub-expression mode' comes in.  In it only the
+ ;;    digit keys are assigned to perform an update that will flash the
+ ;;    corresponding subexp only.
+ 
+ 
+ ;;; Code:
+ 
+ ;; On XEmacs, load the overlay compatibility library
+ (if (not (fboundp 'make-overlay))
+     (require 'overlay))
+ 
+ ;; User costomizable variables
+ (defgroup re-builder nil
+   "Options for the RE Builder."
+   :group 'lisp
+   :prefix "reb-")
+ 
+ (defcustom reb-blink-delay 0.5
+   "*Seconds to blink cursor for next/previous match in RE Builder."
+   :group 're-builder
+   :type 'number)
+ 
+ (defcustom reb-mode-hook nil
+   "*Hooks to run on entering RE Builder mode."
+   :group 're-builder
+   :type 'hook)
+ 
+ (defcustom reb-re-syntax 'read
+   "*Syntax for the REs in the RE Builder.
+ Can either be `read', `string', `sregex' or `lisp-re'."
+   :group 're-builder
+   :type '(choice (const :tag "Read syntax" read)
+                (const :tag "String syntax" string)
+                (const :tag "`sregex' syntax" sregex)
+                (const :tag "`lisp-re' syntax" lisp-re)
+                (const :tag "`rx' syntax" rx)
+                (value: string)))
+ 
+ (defcustom reb-auto-match-limit 200
+   "*Positive integer limiting the matches for RE Builder auto updates.
+ Set it to nil if you don't want limits here."
+   :group 're-builder
+   :type '(restricted-sexp :match-alternatives
+                         (integerp 'nil)))
+ 
+ 
+ (defface reb-match-0
+   '((((class color) (background light))
+      :background "lightblue")
+     (((class color) (background dark))
+      :background "steelblue4")
+     (t
+      :inverse-video t))
+   "Used for displaying the whole match."
+   :group 're-builder)
+ 
+ (defface reb-match-1
+   '((((class color) (background light))
+      :background "aquamarine")
+     (((class color) (background dark))
+      :background "blue3")
+     (t
+      :inverse-video t))
+   "Used for displaying the first matching subexpression."
+   :group 're-builder)
+ 
+ (defface reb-match-2
+   '((((class color) (background light))
+      :background "springgreen")
+     (((class color) (background dark))
+      :background "chartreuse4")
+     (t
+      :inverse-video t))
+   "Used for displaying the second matching subexpression."
+   :group 're-builder)
+ 
+ (defface reb-match-3
+   '((((class color) (background light))
+      :background "yellow")
+     (((class color) (background dark))
+      :background "sienna4")
+     (t
+      :inverse-video t))
+   "Used for displaying the third matching subexpression."
+   :group 're-builder)
+ 
+ ;; Internal variables below
+ (defvar reb-mode nil
+   "Enables the RE Builder minor mode.")
+ 
+ (defvar reb-target-buffer nil
+   "Buffer to which the RE is applied to.")
+ 
+ (defvar reb-target-window nil
+   "Window to which the RE is applied to.")
+ 
+ (defvar reb-regexp nil
+   "Last regexp used by RE Builder.")
+ 
+ (defvar reb-regexp-src nil
+   "Last regexp used by RE Builder before processing it.
+ Except for Lisp syntax this is the same as `reb-regexp'.")
+ 
+ (defvar reb-overlays nil
+   "List of overlays of the RE Builder.")
+ 
+ (defvar reb-window-config nil
+   "Old window configuration.")
+ 
+ (defvar reb-subexp-mode nil
+   "Indicates whether sub-exp mode is active.")
+ 
+ (defvar reb-subexp-displayed nil
+   "Indicates which sub-exp is active.")
+ 
+ (defvar reb-mode-string ""
+   "String in mode line for additional info.")
+ 
+ (defvar reb-valid-string ""
+   "String in mode line showing validity of RE.")
+ 
+ (make-variable-buffer-local 'reb-overlays)
+ (make-variable-buffer-local 'reb-regexp)
+ (make-variable-buffer-local 'reb-regexp-src)
+ 
+ (defconst reb-buffer "*RE-Builder*"
+   "Buffer to use for the RE Builder.")
+ 
+ ;; Define the local "\C-c" keymap
+ (defvar reb-mode-map
+   (let ((map (make-sparse-keymap)))
+     (define-key map "\C-c\C-c" 'reb-toggle-case)
+     (define-key map "\C-c\C-q" 'reb-quit)
+     (define-key map "\C-c\C-w" 'reb-copy)
+     (define-key map "\C-c\C-s" 'reb-next-match)
+     (define-key map "\C-c\C-r" 'reb-prev-match)
+     (define-key map "\C-c\C-i" 'reb-change-syntax)
+     (define-key map "\C-c\C-e" 'reb-enter-subexp-mode)
+     (define-key map "\C-c\C-b" 'reb-change-target-buffer)
+     (define-key map "\C-c\C-u" 'reb-force-update)
+     map)
+   "Keymap used by the RE Builder.")
+ 
+ (defun reb-mode ()
+   "Major mode for interactively building Regular Expressions.
+ \\{reb-mode-map}"
+   (interactive)
+   (kill-all-local-variables)
+   (setq major-mode 'reb-mode
+         mode-name "RE Builder")
+   (use-local-map reb-mode-map)
+   (reb-mode-common)
+   (run-hooks 'reb-mode-hook))
+ 
+ (define-derived-mode reb-lisp-mode
+   emacs-lisp-mode "RE Builder Lisp"
+   "Major mode for interactively building symbolic Regular Expressions."
+   (cond ((eq reb-re-syntax 'lisp-re)  ; Pull in packages
+        (require 'lisp-re))            ; as needed
+       ((eq reb-re-syntax 'sregex)     ; sregex is not autoloaded
+        (require 'sregex))             ; right now..
+       ((eq reb-re-syntax 'rx)         ; rx-to-string is autoloaded
+        (require 'rx)))                ; require rx anyway
+   (reb-mode-common))
+ 
+ ;; Use the same "\C-c" keymap as `reb-mode' and use font-locking from
+ ;; `emacs-lisp-mode'
+ (define-key reb-lisp-mode-map "\C-c"
+   (lookup-key reb-mode-map "\C-c"))
+ 
+ (defvar reb-subexp-mode-map
+   (let ((m (make-keymap)))
+     (suppress-keymap m)
+     ;; Again share the "\C-c" keymap for the commands
+     (define-key m "\C-c" (lookup-key reb-mode-map "\C-c"))
+     (define-key m "q" 'reb-quit-subexp-mode)
+     (dotimes (digit 10)
+       (define-key m (int-to-string digit) 'reb-display-subexp))
+     m)
+   "Keymap used by the RE Builder for the subexpression mode.")
+ 
+ (defun reb-mode-common ()
+   "Setup functions common to functions `reb-mode' and `reb-mode-lisp'."
+ 
+   (setq       reb-mode-string  ""
+       reb-valid-string ""
+       mode-line-buffer-identification
+                        '(25 . ("%b" reb-mode-string reb-valid-string)))
+   (reb-update-modestring)
+   (make-local-variable 'after-change-functions)
+   (add-hook 'after-change-functions
+           'reb-auto-update)
+   ;; At least make the overlays go away if the buffer is killed
+   (make-local-variable 'reb-kill-buffer)
+   (add-hook 'kill-buffer-hook 'reb-kill-buffer)
+   (reb-auto-update nil nil nil))
+ 
+ 
+ ;; Handy macro for doing things in other windows
+ (defmacro reb-with-current-window (window &rest body)
+   "With WINDOW selected evaluate BODY forms and reselect previous window."
+ 
+   (let ((oldwindow (make-symbol "*oldwindow*")))
+     `(let ((,oldwindow (selected-window)))
+        (select-window ,window)
+        (unwind-protect
+          (progn
+            ,@body)
+        (select-window ,oldwindow)))))
+ (put 'reb-with-current-window 'lisp-indent-function 0)
+ 
+ (defun reb-color-display-p ()
+   "Return t if display is capable of displaying colors."
+   (eq 'color
+       ;; emacs/xemacs compatibility
+       (if (fboundp 'frame-parameter)
+         (frame-parameter (selected-frame) 'display-type)
+       (frame-property (selected-frame) 'display-type))))
+ 
+ (defsubst reb-lisp-syntax-p ()
+   "Return non-nil if RE Builder uses a Lisp syntax."
+   (memq reb-re-syntax '(lisp-re sregex rx)))
+ 
+ (defmacro reb-target-binding (symbol)
+   "Return binding for SYMBOL in the RE Builder target buffer."
+   `(with-current-buffer reb-target-buffer ,symbol))
+ 
+ 
+ ;;;###autoload
+ (defun re-builder ()
+   "Call up the RE Builder for the current window."
+   (interactive)
+ 
+   (if (and (string= (buffer-name) reb-buffer)
+            (memq major-mode '(reb-mode reb-lisp-mode)))
+       (message "Already in the RE Builder")
+     (if reb-target-buffer
+         (reb-delete-overlays))
+     (setq reb-target-buffer (current-buffer)
+           reb-target-window (selected-window)
+           reb-window-config (current-window-configuration))
+     (select-window (split-window (selected-window) (- (window-height) 4)))
+     (switch-to-buffer (get-buffer-create reb-buffer))
+     (erase-buffer)
+     (reb-insert-regexp)
+     (goto-char (+ 2 (point-min)))
+     (cond
+      ((reb-lisp-syntax-p)
+       (reb-lisp-mode))
+      (t (reb-mode)))))
+ 
+ (defun reb-change-target-buffer (buf)
+   "Change the target buffer and display it in the target window."
+   (interactive "bSet target buffer to: ")
+ 
+   (let ((buffer (get-buffer buf)))
+     (if (not buffer)
+         (error "No such buffer")
+       (reb-delete-overlays)
+       (setq reb-target-buffer buffer)
+       (reb-do-update
+        (if reb-subexp-mode reb-subexp-displayed nil))
+       (reb-update-modestring))))
+ 
+ (defun reb-force-update ()
+   "Force an update in the RE Builder target window without a match limit."
+   (interactive)
+ 
+   (let ((reb-auto-match-limit nil))
+     (reb-update-overlays
+      (if reb-subexp-mode reb-subexp-displayed nil))))
+ 
+ (defun reb-quit ()
+   "Quit the RE Builder mode."
+   (interactive)
+ 
+   (setq reb-subexp-mode nil
+       reb-subexp-displayed nil)
+   (reb-delete-overlays)
+   (bury-buffer)
+   (set-window-configuration reb-window-config))
+ 
+ (defun reb-next-match ()
+   "Go to next match in the RE Builder target window."
+   (interactive)
+ 
+   (reb-assert-buffer-in-window)
+   (reb-with-current-window
+     reb-target-window
+     (if (not (re-search-forward reb-regexp (point-max) t))
+       (message "No more matches.")
+       (reb-show-subexp
+        (or (and reb-subexp-mode reb-subexp-displayed) 0)
+        t))))
+ 
+ (defun reb-prev-match ()
+   "Go to previous match in the RE Builder target window."
+   (interactive)
+ 
+   (reb-assert-buffer-in-window)
+   (reb-with-current-window reb-target-window
+     (goto-char (1- (point)))
+     (if (not (re-search-backward reb-regexp (point-min) t))
+       (message "No more matches.")
+       (reb-show-subexp
+        (or (and reb-subexp-mode reb-subexp-displayed) 0)
+        t))))
+ 
+ (defun reb-toggle-case ()
+   "Toggle case sensitivity of searches for RE Builder target buffer."
+   (interactive)
+ 
+   (with-current-buffer reb-target-buffer
+     (setq case-fold-search (not case-fold-search)))
+   (reb-update-modestring)
+   (reb-auto-update nil nil nil t))
+ 
+ (defun reb-copy ()
+   "Copy current RE into the kill ring for later insertion."
+   (interactive)
+ 
+   (reb-update-regexp)
+   (let ((re (with-output-to-string
+             (print (reb-target-binding reb-regexp)))))
+     (kill-new (substring re 1 (1- (length re))))
+     (message "Regexp copied to kill-ring")))
+ 
+ ;; The subexpression mode is not electric because the number of
+ ;; matches should be seen rather than a prompt.
+ (defun reb-enter-subexp-mode ()
+   "Enter the subexpression mode in the RE Builder."
+   (interactive)
+   (setq reb-subexp-mode t)
+   (reb-update-modestring)
+   (use-local-map reb-subexp-mode-map)
+   (message "`0'-`9' to display subexpressions  `q' to quit subexp mode."))
+ 
+ (defun reb-show-subexp (subexp &optional pause)
+   "Visually show limit of subexpression SUBEXP of recent search.
+ On color displays this just puts point to the end of the expression as
+ the match should already be marked by an overlay.
+ On other displays jump to the beginning and the end of it.
+ If the optional PAUSE is non-nil then pause at the end in any case."
+   (reb-with-current-window reb-target-window
+     (if (not (reb-color-display-p))
+       (progn (goto-char (match-beginning subexp))
+              (sit-for reb-blink-delay)))
+     (goto-char (match-end subexp))
+     (if (or (not (reb-color-display-p)) pause)
+       (sit-for reb-blink-delay))))
+ 
+ (defun reb-quit-subexp-mode ()
+   "Quit the subexpression mode in the RE Builder."
+   (interactive)
+   (setq reb-subexp-mode nil
+       reb-subexp-displayed nil)
+   (reb-update-modestring)
+   (use-local-map reb-mode-map)
+   (reb-do-update))
+ 
+ (defun reb-change-syntax (&optional syntax)
+   "Change the syntax used by the RE Builder.
+ Optional argument SYNTAX must be specified if called non-interactively."
+   (interactive
+    (list (intern
+         (completing-read "Select syntax: "
+                          (mapcar (lambda (el) (cons (symbol-name el) 1))
+                                  '(read string lisp-re sregex rx))
+                          nil t (symbol-name reb-re-syntax)))))
+ 
+   (if (memq syntax '(read string lisp-re sregex rx))
+       (let ((buffer (get-buffer reb-buffer)))
+       (setq reb-re-syntax syntax)
+       (if buffer
+           (with-current-buffer buffer
+             (erase-buffer)
+             (reb-insert-regexp)
+             (goto-char (+ 2 (point-min)))
+             (cond ((reb-lisp-syntax-p)
+                    (reb-lisp-mode))
+                   (t (reb-mode))))))
+     (error "Invalid syntax: %s" syntax)))
+ 
+ 
+ ;; Non-interactive functions below
+ (defun reb-do-update (&optional subexp)
+   "Update matches in the RE Builder target window.
+ If SUBEXP is non-nil mark only the corresponding sub-expressions."
+ 
+   (reb-assert-buffer-in-window)
+   (reb-update-regexp)
+   (reb-update-overlays subexp))
+ 
+ (defun reb-auto-update (beg end lenold &optional force)
+   "Called from `after-update-functions' to update the display.
+ BEG, END and LENOLD are passed in from the hook.
+ An actual update is only done if the regexp has changed or if the
+ optional fourth argument FORCE is non-nil."
+   (let ((prev-valid reb-valid-string)
+       (new-valid
+        (condition-case nil
+            (progn
+              (if (or (reb-update-regexp) force)
+                  (progn
+                    (reb-assert-buffer-in-window)
+                    (reb-do-update)))
+              "")
+          (error " *invalid*"))))
+     (setq reb-valid-string new-valid)
+     (force-mode-line-update)
+ 
+     ;; Through the caching of the re a change invalidating the syntax
+     ;; for symbolic expressions will not delete the overlays so we
+     ;; catch it here
+     (if (and (reb-lisp-syntax-p)
+            (not (string= prev-valid new-valid))
+            (string= prev-valid ""))
+       (reb-delete-overlays))))
+ 
+ (defun reb-delete-overlays ()
+   "Delete all RE Builder overlays in the `reb-target-buffer' buffer."
+   (if (buffer-live-p reb-target-buffer)
+     (with-current-buffer reb-target-buffer
+       (mapcar 'delete-overlay reb-overlays)
+       (setq reb-overlays nil))))
+ 
+ (defun reb-assert-buffer-in-window ()
+   "Assert that `reb-target-buffer' is displayed in `reb-target-window'."
+ 
+   (if (not (eq reb-target-buffer (window-buffer reb-target-window)))
+       (set-window-buffer reb-target-window reb-target-buffer)))
+ 
+ (defun reb-update-modestring ()
+   "Update the variable `reb-mode-string' displayed in the mode line."
+   (setq reb-mode-string
+       (concat
+        (if reb-subexp-mode
+              (format " (subexp %s)" (or reb-subexp-displayed "-"))
+          "")
+        (if (not (reb-target-binding case-fold-search))
+            " Case"
+          "")))
+   (force-mode-line-update))
+ 
+ (defun reb-display-subexp (&optional subexp)
+   "Highlight only subexpression SUBEXP in the RE Builder."
+   (interactive)
+ 
+   (setq reb-subexp-displayed
+       (or subexp (string-to-int (format "%c" last-command-char))))
+   (reb-update-modestring)
+   (reb-do-update reb-subexp-displayed))
+ 
+ (defun reb-kill-buffer ()
+   "When the RE Builder buffer is killed make sure no overlays stay around."
+ 
+   (if (member major-mode '(reb-mode reb-lisp-mode))
+       (reb-delete-overlays)))
+ 
+ 
+ ;; The next functions are the interface between the regexp and
+ ;; its textual representation in the RE Builder buffer.
+ ;; They are the only functions concerned with the actual syntax
+ ;; being used.
+ (defun reb-read-regexp ()
+   "Read current RE."
+   (save-excursion
+     (cond ((eq reb-re-syntax 'read)
+          (goto-char (point-min))
+          (read (current-buffer)))
+         ((eq reb-re-syntax 'string)
+          (goto-char (point-min))
+          (re-search-forward "\"")
+          (let ((beg (point)))
+            (goto-char (point-max))
+            (re-search-backward "\"")
+            (buffer-substring-no-properties beg (point))))
+         ((reb-lisp-syntax-p)
+          (buffer-string)))))
+ 
+ (defun reb-empty-regexp ()
+   "Return empty RE for current syntax."
+   (cond ((reb-lisp-syntax-p) "'()")
+       (t "")))
+ 
+ (defun reb-insert-regexp ()
+   "Insert current RE."
+ 
+   (let ((re (or (reb-target-binding reb-regexp)
+               (reb-empty-regexp))))
+   (cond ((eq reb-re-syntax 'read)
+        (print re (current-buffer)))
+       ((eq reb-re-syntax 'string)
+        (insert "\n\"" re "\""))
+       ;; For the Lisp syntax we need the "source" of the regexp
+       ((reb-lisp-syntax-p)
+        (insert (or (reb-target-binding reb-regexp-src)
+                    (reb-empty-regexp)))))))
+ 
+ (defun reb-cook-regexp (re)
+   "Return RE after processing it according to `reb-re-syntax'."
+   (cond ((eq reb-re-syntax 'lisp-re)
+        (lre-compile-string (eval (car (read-from-string re)))))
+       ((eq reb-re-syntax 'sregex)
+        (apply 'sregex (eval (car (read-from-string re)))))
+       ((eq reb-re-syntax 'rx)
+        (rx-to-string (eval (car (read-from-string re)))))
+       (t re)))
+ 
+ (defun reb-update-regexp ()
+   "Update the regexp for the target buffer.
+ Return t if the (cooked) expression changed."
+   (let* ((re-src (reb-read-regexp))
+        (re (reb-cook-regexp re-src)))
+     (with-current-buffer reb-target-buffer
+       (let ((oldre reb-regexp))
+       (prog1
+           (not (string= oldre re))
+         (setq reb-regexp re)
+         ;; Only update the source re for the lisp formats
+         (if (reb-lisp-syntax-p)
+             (setq reb-regexp-src re-src)))))))
+ 
+ 
+ ;; And now the real core of the whole thing
+ (defun reb-count-subexps (re)
+   "Return number of sub-expressions in the regexp RE."
+ 
+   (let ((i 0) (beg 0))
+     (while (string-match "\\\\(" re beg)
+       (setq i (1+ i)
+           beg (match-end 0)))
+     i))
+ 
+ 
+ (defun reb-update-overlays (&optional subexp)
+   "Switch to `reb-target-buffer' and mark all matches of `reb-regexp'.
+ If SUBEXP is non-nil mark only the corresponding sub-expressions."
+ 
+   (let* ((re (reb-target-binding reb-regexp))
+        (subexps (reb-count-subexps re))
+        (matches 0)
+        (submatches 0)
+        firstmatch)
+     (save-excursion
+       (set-buffer reb-target-buffer)
+       (reb-delete-overlays)
+       (goto-char (point-min))
+       (while (and (re-search-forward re (point-max) t)
+                 (or (not reb-auto-match-limit)
+                     (< matches reb-auto-match-limit)))
+       (if (= 0 (length (match-string 0)))
+         (error "Empty regular expression!"))
+       (let ((i 0))
+         (setq matches (1+ matches))
+         (while (<= i subexps)
+           (if (and (or (not subexp) (= subexp i))
+                    (match-beginning i))
+               (let ((overlay (make-overlay (match-beginning i)
+                                            (match-end i)))
+                     (face-name (format "reb-match-%d" i)))
+                 (if (not firstmatch)
+                     (setq firstmatch (match-data)))
+                 (setq reb-overlays (cons overlay reb-overlays)
+                       submatches (1+ submatches))
+                 (overlay-put
+                  overlay 'face
+                  (or (intern-soft face-name)
+                      (error "Too many subexpressions - face `%s' not defined"
+                             face-name )))
+                 (overlay-put overlay 'priority i)))
+           (setq i (1+ i))))))
+     (let ((count (if subexp submatches matches)))
+       (message "%s %smatch%s%s"
+              (if (= 0 count) "No" (int-to-string count))
+              (if subexp "subexpression " "")
+              (if (= 1 count) "" "es")
+              (if (and reb-auto-match-limit
+                       (= reb-auto-match-limit count))
+                  " (limit reached)" "")))
+     (if firstmatch
+       (progn (store-match-data firstmatch)
+              (reb-show-subexp (or subexp 0))))))
+ 
+ (provide 're-builder)
+ 
+ ;;; arch-tag: 5c5515ac-4085-4524-a421-033f44f032e7
+ ;;; re-builder.el ends here




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