X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=strings.lisp;h=a97c37ba551f5d2e436da7954d69a138e248232d;hb=8224e25bdd090129666f046627052323ec8f2dbd;hp=fd2f37ca071e8dc6a7f8f7b1a849cbf849d19738;hpb=7367c68a5daa2ef45c7adf1f4097596f84f5e4dd;p=kmrcl.git

diff --git a/strings.lisp b/strings.lisp
index fd2f37c..a97c37b 100644
--- a/strings.lisp
+++ b/strings.lisp
@@ -603,3 +603,23 @@ for characters in a string"
 
 
 
+(defun collapse-whitespace (s)
+  "Convert multiple whitespace characters to a single space character."
+  (declare (simple-string s)
+	   (optimize (speed 3) (safety 0)))
+  (with-output-to-string (stream)
+    (do ((pos 0 (1+ pos))
+	 (in-white nil)
+	 (len (length s)))
+	((= pos len))
+      (declare (fixnum pos len))
+      (let ((c (schar s pos)))
+	(declare (character c))
+	(cond
+	 ((kl:is-char-whitespace c)
+	  (unless in-white
+	    (write-char #\space stream))
+	  (setq in-white t))
+	 (t
+	  (setq in-white nil)
+	  (write-char c stream)))))))