1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
2 ;;;; *************************************************************************
3 ;;;; FILE IDENTIFICATION
5 ;;;; Name: strings.lisp
6 ;;;; Purpose: Strings utility functions for KMRCL package
7 ;;;; Programmer: Kevin M. Rosenberg
8 ;;;; Date Started: Apr 2000
10 ;;;; $Id: strings.lisp,v 1.1 2002/10/12 06:10:17 kevin Exp $
12 ;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
14 ;;;; KMRCL users are granted the rights to distribute and use this software
15 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
16 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
17 ;;;; *************************************************************************
21 (declaim (optimize (speed 3) (safety 1) (compilation-speed 0) (debug 3)))
24 (defmacro string-append (outputstr &rest args)
25 `(setq ,outputstr (concatenate 'string ,outputstr ,@args)))
27 (defmacro string-field-append (outputstr &rest args)
28 `(setq ,outputstr (concatenate 'string ,outputstr ,@args)))
30 (defun list-to-string (lst)
31 "Converts a list to a string, doesn't include any delimiters between elements"
32 (format nil "~{~A~}" lst))
34 (defun count-string-words (str)
35 (declare (simple-string str)
36 (optimize (speed 3) (safety 0)))
39 (declare (fixnum n-words))
40 (dotimes (i (length str))
41 (let ((ch (char str i)))
42 (declare (character ch))
43 (if (alphanumericp ch)
51 (defun delimited-string-to-list (string &optional (separator #\space))
52 (excl:delimited-string-to-list string separator))
55 (defun delimited-string-to-list (sequence &optional (separator #\space))
56 "Split a string by a delimitor"
59 for end = (position separator sequence :start start)
60 collect (subseq sequence start end)
63 (setf start (1+ end))))
66 (defun list-to-delimited-string (list &optional (separator #\space))
67 (excl:list-to-delimited-string list separator))
70 (defun list-to-delimited-string (list &optional (separator #\space))
71 (let ((output (when list (format nil "~A" (car list)))))
72 (dolist (obj (rest list))
73 (setq output (concatenate 'string output
74 (format nil "~A" separator)
75 (format nil "~A" obj))))
78 (defun string-invert (str)
79 "Invert case of a string"
80 (declare (optimize (speed 3) (compilation-speed 0) (debug 0) (safety 0))
82 (let ((up nil) (down nil))
84 (loop for char of-type character across str do
85 (cond ((upper-case-p char) (if down (return-from skip str) (setf up t)))
86 ((lower-case-p char) (if up (return-from skip str) (setf down t)))))
87 (if up (string-downcase str) (string-upcase str)))))
89 (defun add-sql-quotes (s)
90 (substitute-string-for-char s #\' "''"))
92 (defun escape-backslashes (s)
93 (substitute-string-for-char s #\\ "\\\\"))
95 (defun substitute-string-for-char (procstr match-char subst-str)
96 "Substitutes a string for a single matching character of a string"
97 (let ((pos (position match-char procstr)))
100 (subseq procstr 0 pos) subst-str
101 (substitute-string-for-char (subseq procstr (1+ pos)) match-char subst-str))
104 (defun string-substitute (string substring replacement-string)
105 "String substitute by Larry Hunter. Obtained from Google"
106 (let ((substring-length (length substring))
110 (search substring string)
111 (search substring string :start2 last-end)))
113 (concatenate 'string new-string (subseq string last-end)))
117 (subseq string last-end next-start)
119 (setq last-end (+ next-start substring-length)))))
122 (defun string-trim-last-character (s)
123 "Return the string less the last character"
124 (subseq s 0 (1- (length s))))
126 (defun string-hash (str &optional (bitmask 65535))
128 (declare (fixnum hash)
130 (dotimes (i (length str))
132 (setq hash (+ hash (char-code (char str i)))))
133 (logand hash bitmask)))
135 (defun string-not-null? (str)
136 (and str (not (zerop (length str)))))
138 (defun whitespace? (c)
139 (declare (character c))
140 (declare (optimize (speed 3) (safety 0)))
141 (or (char= c #\Space) (char= c #\Tab) (char= c #\Return) (char= c #\Linefeed)))
143 (defun not-whitespace? (c)
144 (not (whitespace? c)))
146 (defun string-ws? (str)
147 "Return t if string is all whitespace"
149 (null (find-if #'not-whitespace? str))))