r5408: *** empty log message ***

[kmrcl.git] / strings.lisp

diff --git a/strings.lisp b/strings.lisp
index 19389e1809564f7d6961f8beb20451ba8acf273d..6b6d9df01474248c55f72790edd1b905becc4a0d 100644 (file)
--- a/strings.lisp
+++ b/strings.lisp
@@ -7,7 +7,7 @@
 ;;;; Programmer:    Kevin M. Rosenberg
 ;;;; Date Started:  Apr 2000
 ;;;;
-;;;; $Id: strings.lisp,v 1.48 2003/07/16 16:01:37 kevin Exp $
+;;;; $Id: strings.lisp,v 1.50 2003/07/21 00:52:56 kevin Exp $
 ;;;;
 ;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
 ;;;;
@@ -540,3 +540,59 @@ for characters in a string"
        (return-from string-strip-ending
          (subseq str 0 (- len (length ending))))))))
        
+
+(defun string-maybe-shorten (str maxlen)
+  (let ((len (length str)))
+    (if (<= len maxlen)
+       str
+      (concatenate 'string (subseq str 0 (- maxlen 3)) "..."))))
+
+
+(defun shrink-vector (str size)
+  #+allegro
+  (excl::.primcall 'sys::shrink-svector str size)
+  #+cmu
+  (lisp::shrink-vector str size)
+  #+lispworks
+  (system::shrink-vector$vector str size)
+  #+sbcl
+  (sb-kernel:shrink-vector str size)
+  #+scl
+  (common-lisp::shrink-vector str size)
+  #-(or allegro cmu lispworks sbcl scl)
+  (setq str (subseq str 0 size))
+  str)
+
+(defun lex-string (string &key (whitespace '(#\space #\newline)))
+  "Separates a string at whitespace and returns a list of strings"
+  (flet ((whitespace? (char) (member char whitespace :test #'char=)))
+    (let ((tokens nil))
+      (do* ((token-start
+             (position-if-not #'whitespace? string) 
+             (when token-end
+               (position-if-not #'whitespace? string :start (1+ token-end))))
+            (token-end
+             (when token-start
+               (position-if #'whitespace? string :start token-start))
+             (when token-start
+               (position-if #'whitespace? string :start token-start))))
+           ((null token-start) (nreverse tokens))
+        (push (subseq string token-start token-end) tokens)))))
+
+(defun split-alphanumeric-string (string)
+  "Separates a string at any non-alphanumeric chararacter"
+  (flet ((whitespace? (char) (non-alphanumericp char)))
+    (let ((tokens nil))
+      (do* ((token-start
+             (position-if-not #'whitespace? string) 
+             (when token-end
+               (position-if-not #'whitespace? string :start (1+ token-end))))
+            (token-end
+             (when token-start
+               (position-if #'whitespace? string :start token-start))
+             (when token-start
+               (position-if #'whitespace? string :start token-start))))
+           ((null token-start) (nreverse tokens))
+        (push (subseq string token-start token-end) tokens)))))
+
+