X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=strings.lisp;h=a97c37ba551f5d2e436da7954d69a138e248232d;hb=035b66e6fe51559e2db70691ddcae4ab641a4873;hp=87d325425c8e7902b9ea06542952e31836aa408e;hpb=b63abea0b53984f96a17b89011e9ca7e6b98602e;p=kmrcl.git

diff --git a/strings.lisp b/strings.lisp
index 87d3254..a97c37b 100644
--- a/strings.lisp
+++ b/strings.lisp
@@ -602,3 +602,24 @@ for characters in a string"
         (push (subseq string token-start token-end) tokens)))))
 
 
+
+(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)))))))