r5126: *** empty log message ***

[kmrcl.git] / strings.lisp

diff --git a/strings.lisp b/strings.lisp
index 5343f31cb0f488c3f01af628c57f40b004a42ecb..bf10d058b85d29ba1da086f9cbc00195ce58540b 100644 (file)
--- a/strings.lisp
+++ b/strings.lisp
@@ -7,7 +7,7 @@
 ;;;; Programmer:    Kevin M. Rosenberg
 ;;;; Date Started:  Apr 2000
 ;;;;
-;;;; $Id: strings.lisp,v 1.37 2003/06/12 02:38:39 kevin Exp $
+;;;; $Id: strings.lisp,v 1.41 2003/06/15 07:48:30 kevin Exp $
 ;;;;
 ;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
 ;;;;
@@ -168,23 +168,25 @@
     (null (find-if #'not-whitespace? str))))
 
 (defun replaced-string-length (str repl-alist)
-  (declare (simple-string str))
-  (let* ((orig-len (length str))
-        (new-len orig-len))
-    (declare (fixnum orig-len new-len))
-    (dotimes (i orig-len)
-      (declare (fixnum i))
+  (declare (simple-string str)
+          (fixnum orig-len new-len)
+          (optimize (speed 3) (safety 0) (space 0)))
+    (do* ((i 0 (1+ i))
+         (orig-len (length str))
+         (new-len orig-len))
+        ((= i orig-len) new-len)
+      (declare (fixnum i orig-len new-len))
       (let* ((c (char str i))
             (match (assoc c repl-alist :test #'char=)))
        (declare (character c))
        (when match
-         (incf new-len (1- (length (cdr match)))))))
-    new-len))
+         (incf new-len (1- (length (cdr match))))))))
 
 (defun substitute-chars-strings (str repl-alist)
   "Replace all instances of a chars with a string. repl-alist is an assoc
 list of characters and replacement strings."
-  (declare (simple-string str))
+  (declare (simple-string str)
+          (optimize (speed 3) (safety 0) (space 0)))
   (do* ((orig-len (length str))
        (new-string (make-string (replaced-string-length str repl-alist)))
        (spos 0 (1+ spos))
@@ -316,6 +318,26 @@ Leading zeros are present."
       (unless (char= (schar str (+ i pos)) (schar substr i))
        (return nil)))))
 
+(defun string-delimited-string-to-list (str substr)
+  "splits a string delimited by substr into a list of strings"
+  #+ignore
+  (declare (simple-string str substr)
+          (optimize (speed 3) (safety 0) (space 0) (compilation-speed 0)))
+  (do* ((substr-len (length substr))
+       (strlen (length str))
+       (output '())
+       (pos 0)
+       (end (fast-string-search substr str substr-len pos strlen)
+            (fast-string-search substr str substr-len pos strlen)))
+       ((null end)
+       (when (< pos strlen)
+         (push (subseq str pos) output))
+       (nreverse output))
+    (declare (fixnum strlen substr-len pos)
+            (type (or fixnum null) end))
+    (push (subseq str pos end) output)
+    (setq pos (+ end substr-len))))
+  
 (defun string-to-list-skip-delimiter (str &optional (delim #\space))
   "Return a list of strings, delimited by spaces, skipping spaces."
   (declare (simple-string str)
@@ -336,3 +358,66 @@ Leading zeros are present."
 (defun string-starts-with (start str)
   (and (>= (length str) (length start))
        (string-equal start str :end2 (length start))))
+
+(defun count-string-char (s c)
+  "Return a count of the number of times a character appears in a string"
+  (declare (simple-string s)
+          (character c)
+          (optimize (speed 3) (safety 0)))
+  (do ((len (length s))
+       (i 0 (1+ i))
+       (count 0))
+      ((= i len) count)
+    (declare (fixnum i len count))
+    (when (char= (schar s i) c)
+      (incf count))))
+
+(defun count-string-char-if (pred s)
+  "Return a count of the number of times a predicate is true
+for characters in a string"
+  (declare (simple-string s)
+          (optimize (speed 3) (safety 0) (space 0)))
+  (do ((len (length s))
+       (i 0 (1+ i))
+       (count 0))
+      ((= i len) count)
+    (declare (fixnum i len count))
+    (when (funcall pred (schar s i))
+      (incf count))))
+
+
+;;; URL Encoding
+
+(defun non-alphanumericp (ch)
+  (not (alphanumericp ch)))
+
+(defvar +hex-chars+ "0123456789ABCDEF")
+(declaim (type (simple-array character 16) +hex-chars+))
+
+(defun hexchar (n)
+  (declare (type (integer 0 15) n))
+  (aref +hex-chars+ n))
+
+(defun escape-uri-field (query)
+  "Escape non-alphanumeric characters for URI fields"
+  (declare (simple-string query)
+          (optimize (speed 3) (safety 0) (space 0)))
+  (do* ((count (count-string-char-if #'non-alphanumericp query))
+       (len (length query))
+       (new-len (+ len (* 2 count)))
+       (str (make-string new-len))
+       (spos 0 (1+ spos))
+       (dpos 0 (1+ dpos)))
+      ((= spos len) str)
+    (declare (fixnum count len new-len spos dpos)
+            (simple-string str))
+    (let ((ch (schar query spos)))
+      (if (non-alphanumericp ch)
+         (let ((c (char-code ch)))
+           (setf (schar str dpos) #\%)
+           (incf dpos)
+           (setf (schar str dpos) (hexchar (logand (ash c -4) 15)))
+           (incf dpos)
+           (setf (schar str dpos) (hexchar (logand c 15))))
+       (setf (schar str dpos) ch)))))
+