lstypes.lsp

   1 ;;; -*- mode: lisp -*-
   2
   3 ;;; Copyright (c) 2005--2007, by A.J. Rossini <blindglobe@gmail.com>
   4 ;;; See COPYRIGHT file for any additional restrictions (BSD license).
   5 ;;; Since 1991, ANSI was finally finished.  Edited for ANSI Common Lisp.
   6
   7 (in-package :cl-user)
   8
   9 (defpackage :lisp-stat-types
  10  (:use :common-lisp)
  11  (:export fixnump check-nonneg-fixnum check-one-fixnum
  12           check-one-real check-one-number))
  13
  14 (in-package :lisp-stat-types)
  15
  16 ;;; Type Checking Functions
  17 ;;; (Moved out of lsbasics.lsp, placed there by initial design).
  18
  19 (defun fixnump (x)
  20   "Args: (x)
  21 Returns T if X is a fixnum; NIL otherwise."
  22   (declare (inline typep))
  23   (typep x 'fixnum))
  24
  25 (defun check-nonneg-fixnum (x)
  26   "Ensure that x or all elts of x are non-negative fixnums."
  27   (cond ((listp x)
  28          (map 'list #'check-one-nonneg-fixnum x))
  29         (t (check-one-nonneg-fixnum x))))
  30
  31 (defun check-one-nonneg-fixnum (x)
  32   "return value if true, throw error otherwise."
  33   (if (and (fixnump x) (<= 0 x))
  34       x
  35       (error "Expected non-negative fixnum, but got ~A" x)))
  36
  37 (defun check-one-fixnum (x)
  38   (if (not (fixnump x))
  39       (error "not a fixnum - ~a" x)))
  40
  41 (defun check-one-real (a)
  42   (if (not (or (rationalp a) (floatp a)))
  43       (error "not a real number ~s" a)
  44     t))
  45
  46 (defun check-one-number (a)
  47   (if (not (numberp a))
  48       (error "not a number ~s" a)
  49     t))