r9892: new functions

[kmrcl.git] / strings.lisp

diff --git a/strings.lisp b/strings.lisp
index 8eb08f74e9faa7ac1b243ee78988db6b2a239444..9dbe1babdccd7950172033dc0d5c6d9614ff4921 100644 (file)
--- a/strings.lisp
+++ b/strings.lisp
@@ -413,9 +413,9 @@ for characters in a string"
   (declare (type (integer 0 15) n))
   (schar +hex-chars+ n))
 
-(defconstant +char-code-lower-a+ (char-code #\a))
-(defconstant +char-code-upper-a+ (char-code #\A))
-(defconstant +char-code-0+ (char-code #\0))
+(defconst +char-code-lower-a+ (char-code #\a))
+(defconst +char-code-upper-a+ (char-code #\A))
+(defconst +char-code-0+ (char-code #\0))
 (declaim (type fixnum +char-code-0+ +char-code-upper-a+
               +char-code-0))
 
@@ -476,9 +476,9 @@ for characters in a string"
 
 
 (eval-when (:compile-toplevel :load-toplevel :execute)
-  (defvar +unambigous-charset+
+  (defvar +unambiguous-charset+
     "abcdefghjkmnpqrstuvwxyz123456789ABCDEFGHJKLMNPQSRTUVWXYZ")
-  (defconstant +unambigous-length+ (length +unambigous-charset+)))
+  (defconstant +unambiguous-length+ (length +unambiguous-charset+)))
 
 (defun random-char (&optional (set :lower-alpha))
   (ecase set
@@ -491,8 +491,8 @@ for characters in a string"
         (code-char (+ +char-code-lower-a+ n)))))
     (:upper-alpha
      (code-char (+ +char-code-upper-a+ (random 26))))
-    (:unambigous
-     (schar +unambigous-charset+ (random +unambigous-length+)))
+    (:unambiguous
+     (schar +unambiguous-charset+ (random +unambiguous-length+)))
     (:upper-lower-alpha
      (let ((n (random 52)))
        (if (>= n 26)
@@ -552,11 +552,24 @@ for characters in a string"
        
 
 (defun string-maybe-shorten (str maxlen)
-  (let ((len (length str)))
-    (if (<= len maxlen)
-       str
-      (concatenate 'string (subseq str 0 (- maxlen 3)) "..."))))
+  (string-elide str maxlen :end))
 
+(defun string-elide (str maxlen position)
+  (declare (fixnum maxlen))
+  (let ((len (length str)))
+    (declare (fixnum len))
+    (cond
+     ((<= len maxlen)
+      str)
+     ((<= maxlen 3)
+      "...")
+     ((eq position :middle)
+      (multiple-value-bind (mid remain) (truncate maxlen 2)
+       (let ((end1 (- mid 1))
+             (start2 (- len (- mid 2) remain))) 
+         (concatenate 'string (subseq str 0 end1) "..." (subseq str start2)))))
+     ((or (eq position :end) t)
+      (concatenate 'string (subseq str 0 (- maxlen 3)) "...")))))
 
 (defun shrink-vector (str size)
   #+allegro
@@ -591,7 +604,12 @@ for characters in a string"
 
 (defun split-alphanumeric-string (string)
   "Separates a string at any non-alphanumeric chararacter"
-  (flet ((is-sep (char) (non-alphanumericp char)))
+  (declare (simple-string string)
+          (optimize (speed 3) (safety 0)))
+  (flet ((is-sep (char) 
+          (declare (character char))
+          (and (non-alphanumericp char)
+               (not (char= #\_ char)))))
     (let ((tokens nil))
       (do* ((token-start
              (position-if-not #'is-sep string) 
@@ -606,6 +624,30 @@ for characters in a string"
         (push (subseq string token-start token-end) tokens)))))
 
 
+(defun trim-non-alphanumeric (word)
+  "Strip non-alphanumeric characters from beginning and end of a word."
+  (declare (simple-string word)
+          (optimize (speed 3) (safety 0) (space 0)))
+  (let* ((start 0)
+        (len (length word))
+        (end len))
+    (declare (fixnum start end len))
+    (do ((done nil))
+       ((or done (= start end)))
+      (if (alphanumericp (schar word start))
+         (setq done t)
+       (incf start)))
+    (when (> end start)
+      (do ((done nil))
+         ((or done (= start end)))
+       (if (alphanumericp (schar word (1- end)))
+           (setq done t)
+         (decf end))))
+    (if (or (plusp start) (/= len end))
+       (subseq word start end)
+      word)))
+
+         
 
 (defun collapse-whitespace (s)
   "Convert multiple whitespace characters to a single space character."