From: Juri Linkov <juri@jurta.org>
Date: Sat, 10 Nov 2007 21:48:16 +0000 (+0000)
Subject: (match-substitute-replacement): New function.
X-Git-Tag: emacs-pretest-23.0.90~9791
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=8c2e721a69fd7d5a517393a83f4ffc189a699638;p=emacs.git

(match-substitute-replacement): New function.
---

diff --git a/lisp/subr.el b/lisp/subr.el
index 17008e058ba..17abc70e073 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -2709,6 +2709,24 @@ STRING should be given if the last search was by `string-match' on STRING."
 	(buffer-substring-no-properties (match-beginning num)
 					(match-end num)))))
 
+
+(defun match-substitute-replacement (replacement
+				     &optional fixedcase literal string subexp)
+  "Return REPLACEMENT as it will be inserted by `replace-match'.
+In other words, all back-references in the form `\\&' and `\\N'
+are substituted with actual strings matched by the last search.
+Optional FIXEDCASE, LITERAL, STRING and SUBEXP have the same
+meaning as for `replace-match'."
+  (let ((match (match-string 0 string)))
+    (save-match-data
+      (set-match-data (mapcar (lambda (x)
+				(if (numberp x)
+				    (- x (match-beginning 0))
+				  x))
+			      (match-data t)))
+      (replace-match replacement fixedcase literal match subexp))))
+
+
 (defun looking-back (regexp &optional limit greedy)
   "Return non-nil if text before point matches regular expression REGEXP.
 Like `looking-at' except matches before point, and is slower.