Fix previous rmail-output-read-file-name change

[gnu-emacs] / lisp / emacs-lisp / rx.el

diff --git a/lisp/emacs-lisp/rx.el b/lisp/emacs-lisp/rx.el
index c246d0235f6ca2d389221e6376e706eff4b8a6c0..774c6cd2c38002b544133677187aa6431ee7d873 100644 (file)
--- a/lisp/emacs-lisp/rx.el
+++ b/lisp/emacs-lisp/rx.el
@@ -35,9 +35,8 @@
 ;; that the `repeat' form can't have multiple regexp args.
 
 ;; Now alternative forms are provided for a degree of compatibility
-;; with Shivers' attempted definitive SRE notation
-;; <URL:http://www.ai.mit.edu/~/shivers/sre.txt>.  SRE forms not
-;; catered for include: dsm, uncase, w/case, w/nocase, ,@<exp>,
+;; with Olin Shivers' attempted definitive SRE notation.  SRE forms
+;; not catered for include: dsm, uncase, w/case, w/nocase, ,@<exp>,
 ;; ,<exp>, (word ...), word+, posix-string, and character class forms.
 ;; Some forms are inconsistent with SRE, either for historical reasons
 ;; or because of the implementation -- simple translation into Emacs
@@ -108,7 +107,9 @@
 
 ;;; Code:
 
-(defconst rx-constituents
+;; FIXME: support macros.
+
+(defvar rx-constituents              ;Not `const' because some modes extend it.
   '((and               . (rx-and 1 nil))
     (seq               . and)          ; SRE
     (:                 . and)          ; SRE
@@ -832,27 +833,28 @@ If FORM is '(minimal-match FORM1)', non-greedy versions of `*',
 FORM is a regular expression in sexp form.
 RX-PARENT shows which type of expression calls and controls putting of
 shy groups around the result and some more in other functions."
-  (if (stringp form)
-      (rx-group-if (regexp-quote form)
-                  (if (and (eq rx-parent '*) (< 1 (length form)))
-                      rx-parent))
-    (cond ((integerp form)
-          (regexp-quote (char-to-string form)))
-         ((symbolp form)
-          (let ((info (rx-info form nil)))
-            (cond ((stringp info)
-                   info)
-                  ((null info)
-                   (error "Unknown rx form `%s'" form))
-                  (t
-                   (funcall (nth 0 info) form)))))
-         ((consp form)
-          (let ((info (rx-info (car form) 'head)))
-            (unless (consp info)
-              (error "Unknown rx form `%s'" (car form)))
-            (funcall (nth 0 info) form)))
-         (t
-          (error "rx syntax error at `%s'" form)))))
+  (cond
+   ((stringp form)
+    (rx-group-if (regexp-quote form)
+                 (if (and (eq rx-parent '*) (< 1 (length form)))
+                     rx-parent)))
+   ((integerp form)
+    (regexp-quote (char-to-string form)))
+   ((symbolp form)
+    (let ((info (rx-info form nil)))
+      (cond ((stringp info)
+             info)
+            ((null info)
+             (error "Unknown rx form `%s'" form))
+            (t
+             (funcall (nth 0 info) form)))))
+   ((consp form)
+    (let ((info (rx-info (car form) 'head)))
+      (unless (consp info)
+        (error "Unknown rx form `%s'" (car form)))
+      (funcall (nth 0 info) form)))
+   (t
+    (error "rx syntax error at `%s'" form))))
 
 
 ;;;###autoload