;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Apr 2000
;;;;
-;;;; $Id: strings.lisp,v 1.41 2003/06/15 07:48:30 kevin Exp $
+;;;; $Id: strings.lisp,v 1.44 2003/06/17 13:56:38 kevin Exp $
;;;;
;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
;;;;
(defun replaced-string-length (str repl-alist)
(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))
(match (assoc c repl-alist :test #'char=)))
(declare (character c))
(when match
- (incf new-len (1- (length (cdr match))))))))
+ (incf new-len (1- (length
+ (the simple-string (cdr match)))))))))
(defun substitute-chars-strings (str repl-alist)
"Replace all instances of a chars with a string. repl-alist is an assoc
(do* ((zero-code (char-code #\0))
(result (make-string len :initial-element #\0))
(minus? (minusp num))
- (val (if minus? (- 0 num) num) (floor (/ val 10)))
+ (val (if minus? (- num) num)
+ (nth-value 0 (floor val 10)))
(pos (1- len) (1- pos))
(mod (mod val 10) (mod val 10)))
((or (zerop val) (minusp pos))
"Outputs a string of LEN digit with an optional initial character PCHAR.
Leading zeros are present."
(declare (optimize (speed 3) (safety 0) (space 0))
- (type fixnum len) (type integer num))
+ (type fixnum len)
+ (type integer num))
(do* ((zero-code (char-code #\0))
(result (make-string len :initial-element #\0))
(minus? (minusp num))
- (val (if minus? (- 0 num) num) (floor (/ val 10)))
+ (val (if minus? (- 0 num) num)
+ (nth-value 0 (floor val 10)))
(pos (1- len) (1- pos))
(mod (mod val 10) (mod val 10)))
((or (zerop val) (minusp pos))
(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)))
+ (optimize (speed 3) (safety 0) (space 0) (compilation-speed 0)
+ (debug 0)))
(do* ((substr-len (length substr))
(strlen (length str))
(output '())
(when (and i (< i end))
(push (subseq str i end) results))
(nreverse results))
- (declare (fixnum i j end))
+ (declare (fixnum end)
+ (type (or fixnum null) i j))
(push (subseq str i j) results)))
(defun string-starts-with (start str)
"Return a count of the number of times a predicate is true
for characters in a string"
(declare (simple-string s)
+ (type (or function symbol) pred)
(optimize (speed 3) (safety 0) (space 0)))
(do ((len (length s))
(i 0 (1+ i))
(not (alphanumericp ch)))
(defvar +hex-chars+ "0123456789ABCDEF")
-(declaim (type (simple-array character 16) +hex-chars+))
+(declaim (type simple-string +hex-chars+))
(defun hexchar (n)
(declare (type (integer 0 15) n))
- (aref +hex-chars+ n))
+ (schar +hex-chars+ n))
(defun escape-uri-field (query)
"Escape non-alphanumeric characters for URI fields"
(setf (schar str dpos) (hexchar (logand c 15))))
(setf (schar str dpos) ch)))))
+(defconstant +char-code-a+ (char-code #\a))
+
+(defun random-string (&optional (len 10))
+ "Returns a random lower-case string."
+ (declare (optimize (speed 3)))
+ (let ((s (make-string len)))
+ (declare (simple-string s)
+ (dotimes (i len s)
+ (setf (schar s i) (code-char (+ +code-char-a+ (random 26))))))))
+
+
+(defun first-char (s)
+ (declare (simple-string s))
+ (when (and (stringp s) (plusp (length s)))
+ (schar s 0)))
+
+(defun last-char (s)
+ (declare (simple-string s))
+ (when (stringp s)
+ (let ((len (length s)))
+ (when (plusp len))
+ (schar s (1- len)))))