utils.lisp - clic - Clic is an command line interactive client for gopher written in Common LISP
(HTM) git clone git://bitreich.org/clic/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/clic/
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utils.lisp (3914B)
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1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
2 ;;;
3 ;;; utils.lisp --- Various utilities.
4 ;;;
5 ;;; Copyright (C) 2005-2008, Luis Oliveira <loliveira(@)common-lisp.net>
6 ;;;
7 ;;; Permission is hereby granted, free of charge, to any person
8 ;;; obtaining a copy of this software and associated documentation
9 ;;; files (the "Software"), to deal in the Software without
10 ;;; restriction, including without limitation the rights to use, copy,
11 ;;; modify, merge, publish, distribute, sublicense, and/or sell copies
12 ;;; of the Software, and to permit persons to whom the Software is
13 ;;; furnished to do so, subject to the following conditions:
14 ;;;
15 ;;; The above copyright notice and this permission notice shall be
16 ;;; included in all copies or substantial portions of the Software.
17 ;;;
18 ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 ;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 ;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 ;;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
22 ;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23 ;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 ;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 ;;; DEALINGS IN THE SOFTWARE.
26 ;;;
27
28 (in-package #:cffi)
29
30 (defmacro discard-docstring (body-var &optional force)
31 "Discards the first element of the list in body-var if it's a
32 string and the only element (or if FORCE is T)."
33 `(when (and (stringp (car ,body-var)) (or ,force (cdr ,body-var)))
34 (pop ,body-var)))
35
36 (defun single-bit-p (integer)
37 "Answer whether INTEGER, which must be an integer, is a single
38 set twos-complement bit."
39 (if (<= integer 0)
40 nil ; infinite set bits for negatives
41 (loop until (logbitp 0 integer)
42 do (setf integer (ash integer -1))
43 finally (return (zerop (ash integer -1))))))
44
45 ;;; This function is here because it needs to be defined early. It's
46 ;;; used by DEFINE-PARSE-METHOD and DEFCTYPE to warn users when
47 ;;; they're defining types whose names belongs to the KEYWORD or CL
48 ;;; packages. CFFI itself gets to use keywords without a warning.
49 (defun warn-if-kw-or-belongs-to-cl (name)
50 (let ((package (symbol-package name)))
51 (when (and (not (eq *package* (find-package '#:cffi)))
52 (member package '(#:common-lisp #:keyword)
53 :key #'find-package))
54 (warn "Defining a foreign type named ~S. This symbol belongs to the ~A ~
55 package and that may interfere with other code using CFFI."
56 name (package-name package)))))
57
58 (define-condition obsolete-argument-warning (style-warning)
59 ((old-arg :initarg :old-arg :reader old-arg)
60 (new-arg :initarg :new-arg :reader new-arg))
61 (:report (lambda (c s)
62 (format s "Keyword ~S is obsolete, please use ~S"
63 (old-arg c) (new-arg c)))))
64
65 (defun warn-obsolete-argument (old-arg new-arg)
66 (warn 'obsolete-argument-warning
67 :old-arg old-arg :new-arg new-arg))
68
69 (defun split-if (test seq &optional (dir :before))
70 (remove-if #'(lambda (x) (equal x (subseq seq 0 0)))
71 (loop for start fixnum = 0
72 then (if (eq dir :before)
73 stop
74 (the fixnum (1+ (the fixnum stop))))
75 while (< start (length seq))
76 for stop = (position-if test seq
77 :start (if (eq dir :elide)
78 start
79 (the fixnum (1+ start))))
80 collect (subseq seq start
81 (if (and stop (eq dir :after))
82 (the fixnum (1+ (the fixnum stop)))
83 stop))
84 while stop)))