sources from planet 1.5
parent
4cc4d7096b
commit
668032cec6
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#lang racket
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;;; describe-test.rkt
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;;; Copyright (c) 2009-2010 M. Douglas Williams
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;;;
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;;; This program is free software: you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation, either version 3 of the License, or
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;;; (at your option) any later version.
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;;;
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;;; This program is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;;
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(require math/bigfloat
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racket/mpair)
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(require (planet williams/describe/describe))
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;;; Booleans
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(printf "~n--- Booleans ---~n")
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(describe #t)
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(describe #f)
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;;; Numbers
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(printf "~n--- Numbers ---~n")
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(define (! n)
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(if (= n 0)
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1
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(* n (! (sub1 n)))))
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(describe +inf.0)
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(describe -inf.0)
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(describe +nan.0)
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(describe 0)
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(describe (! 10))
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(describe (! 40))
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(describe (- (! 40) (! 41)))
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(describe (! 100))
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(describe (/ (! 10) (add1 (! 11))))
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(describe -1+3i)
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(describe 0.0)
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(describe 0.1e0)
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(describe 0.1f0)
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(describe 0.1t0)
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(describe (* (! 10) 1.0))
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(describe 6.0221313e23)
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(describe 6.0221313f23)
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(describe 6.0221313t23)
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(describe (exact->inexact (! 40)))
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(describe (sqrt 10))
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(describe (sqrt -10))
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(describe (+ (sqrt 10) (sqrt -10)))
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(describe (bf 1/10))
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(describe (bf "15e200000000"))
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;;; Strings
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(printf "~n--- Strings ---~n")
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(describe "abc")
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(describe (string #\1 #\2 #\3))
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;;; Byte Strings
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(printf "~n--- Byte Strings ---~n")
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(describe #"abc")
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(describe (bytes 48 49 50))
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;;; Characters
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(printf "~n--- Characters ---~n")
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(describe #\a)
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(describe #\A)
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(describe #\0)
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(describe #\()
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;;; Symbols
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(printf "~n--- Symbols ---~n")
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(describe 'abc)
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(describe '|(a + b)|)
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(describe (gensym))
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;;; Regular Expressions
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(printf "~n--- Regular Expressions ---~n")
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(describe #rx"Ap*le")
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(describe #px"Ap*le")
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;;; Byte Regular Expressions
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(printf "~n--- Byte Regular Expressions ---~n")
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(describe #rx#"Ap*le")
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(describe #px#"Ap*le")
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;;; Keywords
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(printf "~n--- Keywords ---~n")
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(describe '#:key)
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;;; Lists and Pairs
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(printf "~n--- Lists and Pairs ---~n")
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(describe '(this is a proper list))
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(describe '(this is an improper . list))
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(describe (list '(this . is) '(also . a) '(proper . list)))
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;;; Mutable Lists and Pairs
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(printf "~n--- Mutable Lists and Pairs ---~n")
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(describe (mlist 'this 'is 'a 'proper 'list))
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(describe (mcons 'this (mcons 'is (mcons 'an (mcons 'improper 'list)))))
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(describe (mlist '(this . is) '(also . a) '(proper . list)))
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;;; Vectors
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(printf "~n--- Vectors ---~n")
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(describe #(1 2 3))
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;;; Boxes
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(printf "~n--- Boxes ---~n")
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(describe (box 12))
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(describe (box (box 'a)))
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(describe (box (sqrt 10)))
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;;; Weak Boxes
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(printf "~n--- Weak Boxes ---~n")
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(describe (make-weak-box 12))
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(describe (make-weak-box (make-weak-box 'a)))
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(describe (make-weak-box (sqrt 10)))
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;;; Hashes
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(printf "~n--- Hashes ---~n")
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(describe #hash((a . 12) (b . 14) (c . 16)))
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(describe #hasheq((a . a) (b . b) (c . c)))
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(describe #hasheqv((a . #\a) (b . #\b) (c . #\c)))
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(define ht (make-hash))
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(hash-set! ht 'a 12)
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(hash-set! ht 'b 14)
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(hash-set! ht 'c 16)
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(describe ht)
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(define wht (make-weak-hash))
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(hash-set! wht 'a 12)
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(hash-set! wht 'b 14)
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(hash-set! wht 'c 16)
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(describe wht)
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;;; Procedures
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(printf "~n--- Procedures ---~n")
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(describe car)
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(describe open-output-file)
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(describe current-input-port)
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(describe (lambda (x) x))
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;;; Ports
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(printf "~n--- Ports ---~n")
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(describe (current-input-port))
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(describe (current-output-port))
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;;; Void
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(printf "~n--- Void ---~n")
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(describe (void))
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;;; EOF
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(printf "~n--- EOF ---~n")
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(describe eof)
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;;; Paths
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(printf "~n--- Paths ---~n")
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(describe (string->path "C:\\Program-files\\PLT"))
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(describe (string->path "../dir/file.ext"))
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;;; Structures
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(printf "~n--- Structures ---~n")
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(define-struct transparent-struct (a b c) #:transparent)
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(define ts-1 (make-transparent-struct 'a 'b 'c))
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(describe ts-1)
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;;; Other Named Things (I.E., Opaque Structures)
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(printf "~n--- Other Named Things ---~n")
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(define-struct opaque-struct (a b c))
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(define os-1 (make-opaque-struct 'a 'b 'c))
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(describe os-1)
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@ -0,0 +1,870 @@
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#lang racket
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;;; describe.rkt
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;;; Copyright (c) 2009-2010 M. Douglas Williams
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;;;
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;;; This program is free software: you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation, either version 3 of the License, or
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;;; (at your option) any later version.
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;;;
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;;; This program is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;;
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;;; -----------------------------------------------------------------------------
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;;;
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;;; This file provides four procedures: variant, integer->string, describe,
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;;; and description.
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;;;
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;;; (variant x) -> symbol?
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;;; x : any/c
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;;; Returns a symbol identifying the type of any object.
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;;; Examples:
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;;; (variant (λ (x) x)) -> procedure
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;;; (variant 1) -> fixnum-integer
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;;; (variant (let/cc k k)) -> continuation
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;;; (variant (let/ec k k)) -> escape-continuation
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;;;
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;;; (integer->string n) -> string?
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;;; n : exact-integer?
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;;; Returns a string with the name of the exact integer n. This works for
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;;; integers whose magnitude is less than 10e102.
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;;; Examples:
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;;; >(integer->string 0)
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;;; "zero"
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;;; >(integer->string (expt 2 16))
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;;; "sixty-five thousand five hundred and thirty-six"
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;;; > (integer->string (expt 10 100))
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;;; "ten duotrigillion"
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;;; > (integer->string (expt 10 150))
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;;; "at least 10^102"
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;;;
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;;; (describe x) -> void?
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;;; x : any/c
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;;; Prints a description of x to the current output port.
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;;; Examples:
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;;; >(describe (sqrt 10))
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;;; 3.1622776601683795 is an inexact positive real number
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;;; >(describe (sqrt -10))
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;;; 0+3.1622776601683795i is an inexact positive imaginary number
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;;; >(describe #\a)
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;;; #\a is the character whose code-point number is 97(#x61) and general category is 'll (letter, lowercase)
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;;; >(describe '(this is a proper list))
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;;; (this is a proper list) is a proper immutable list of length 5
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;;; >(describe car)
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;;; #<procedure:car> is a primitive procedure named car that accepts 1 argument and returns 1 result
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;;;
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;;; (description x) -> string?
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;;; x : any/c
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;;; Returns a string describing the object, x.
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;;;
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;;; -----------------------------------------------------------------------------
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;;;
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;;; Version Date Description
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;;; 1.0.0 11/10/09 Initial Release to PLaneT (MDW)
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;;; 2.0.0 10/27/10 Updated to Racket. (MDW)
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;;; 2.0.1 08/26/13 Added exact decimal value for floats. (MDW)
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;;; 2.0.1 09/26/13 Added bigfloat support to float->string. (MDW)
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(require math/bigfloat
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racket/extflonum
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racket/mpair)
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;;; (variant x) -> symbol
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;;; x : any/c
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;;; Returns a symbol identifying the type of any object. This is from a post on
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;;; The PLT Scheme mailing list from Robby Findler. The following is a short
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;;; explanation of its origin:
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;;; I'm not sure about always, but at some point a while ago, Matthew
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;;; decided that all values are structs (in the sense that you could have
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;;; implemented everything with structs and scope, etc even if some of
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;;; them are implemented in C) and adapted the primitives to make them
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;;; behave accordingly.
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;;; Examples:
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;;; (variant (λ (x) x)) -> procedure
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;;; (variant 1) -> fixnum-integer
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;;; (variant (let/cc k k)) -> continuation
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;;; (variant (let/ec k k)) -> escape-continuation
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(define (variant x)
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(string->symbol
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(regexp-replace #rx"^struct:"
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(symbol->string (vector-ref (struct->vector x) 0))
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"")))
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;;; (imaginary? z) -> boolean?
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;;; z : any/c
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;;; Returns #t if z is an imaginary number. An imaginary number is a complex
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;;; number whose real part is exactly zero and whose imaginary part is not
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;;; zero.
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(define (imaginary? z)
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(and (complex? z)
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(let ((zr (real-part z)))
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(and (exact? zr) (zero? zr)))
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;(let ((zi (imag-part z)))
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; (not (and (exact? zi) (zero? zi))))
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))
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;;; (boolean-description bool) -> string?
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;;; bool : boolean?
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;;; Returns a string describing the boolean, bool.
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(define (boolean-description bool)
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(format "~s is a Boolean ~a"
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bool (if bool "true" "false")))
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;;; small-integer-names : (vectorof string?)
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;;; A vector of the names of the integers less than 20.
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(define small-integer-names
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#("zero" ; not used
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"one"
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"two"
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"three"
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"four"
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"five"
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"six"
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"seven"
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"eight"
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"nine"
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"ten"
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"eleven"
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"twelve"
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"thirteen"
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"fourteen"
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"fifteen"
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"sixteen"
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"seventeen"
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"eighteen"
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"nineteen"))
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;;; (integer-0-19->string n) -> string?
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;;; n : (and/c exact? (integer-in 0 19))
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;;; Returns a string with the name of the number n, which must be between
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;;; 0 and 19 (i.e., less than 20).
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(define (integer-0-19->string n)
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(vector-ref small-integer-names n))
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;;; decade-names : (vectorof string?)
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;;; The names of the multiples of ten that are less than 100.
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(define decade-names
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#("zero" ; not used
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"ten"
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"twenty"
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"thirty"
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"forty"
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"fifty"
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"sixty"
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"seventy"
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"eighty"
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"ninety"))
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;;; (integer-0-99->string n) -> string?
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;;; n : (and/c exact? (integer-in 0 99))
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;;; Returns a string with the name of the integer n, which must be between
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;;; 0 and 99 (i.e., less than 100).
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(define (integer-0-99->string n)
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(if (< n 20)
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(integer-0-19->string n)
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(let-values (((q10 r10) (quotient/remainder n 10)))
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(if (= r10 0)
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(vector-ref decade-names q10)
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(string-append (vector-ref decade-names q10)
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"-"
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(vector-ref small-integer-names r10))))))
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;;; (integer-0-999->string n include-and?) -> string?
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;;; n : (and/c exact? (integer-in 0 999))
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;;; include-and? : boolean? = #f
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;;; Returns a string with the name of the integer n, which must be between
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;;; 0 and 999 (i.e., less than 1000). If include-and? is true, the British
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;;; convention of including and after the hundreds is used.
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(define (integer-0-999->string n (include-and? #f))
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(if (< n 100)
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(integer-0-99->string n)
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(let-values (((q100 r100) (quotient/remainder n 100)))
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(string-append (vector-ref small-integer-names q100)
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" hundred"
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(if (= r100 0)
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""
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(string-append (if include-and? " and " " ")
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(integer-0-99->string r100)))))))
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;;; thousands-names : (vectorof string?)
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;;; The names of powers of a thousand up to 10^99, so they can be used for
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;;; integers less than 10^102.
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(define thousands-names
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#("zero" ; not used
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"thousand"
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"million"
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"billion"
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"trillion"
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"quadrillion"
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"quintillion"
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"sextillion"
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"septillion"
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"octillion"
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"nonillion"
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"decillion"
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"undecillion"
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"duodecillion"
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"tredecillion"
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"quattuordecillion"
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"quindecillion"
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"sexdecillion"
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"septemdecillion"
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"octdecillion"
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"novemdecillion"
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"vigintillion"
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"unvigintillion"
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"duovigintillion"
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"tresvigintillion"
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"quattuorvigintillion"
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"quinquavigintillion"
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"sesvigintillion"
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"septenviginitillion"
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"octovigintillion"
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"novemvigintillion"
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"trigintillion"
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"untrigillion"
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"duotrigillion"))
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;;; max-integer->string : exact-positive-integer? = (expt 10 102)
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;;; The limit for returning the name of an integer.
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(define max-integer->string (expt 10 102))
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;;; (integer->string n) -> string?
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;;; n : exact-integer?
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;;; Returns a string with the name of the exact integer n. This works for
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;;; integers whose magnitude is less than 10e102.
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(define (integer->string n)
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(cond ((zero? n)
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"zero")
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((negative? n)
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(string-append "minus " (integer->string (abs n))))
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((< n 1000)
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(integer-0-999->string n #t))
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((< n max-integer->string)
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(let/ec exit
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(let loop ((str "")
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(thousand-power 0)
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(n n))
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(if (= n 0)
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(exit str)
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(let-values (((q1000 r1000) (quotient/remainder n 1000)))
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(loop (if (= thousand-power 0)
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(if (= r1000 0)
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""
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(if (< r1000 20)
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(string-append "and "
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(integer-0-19->string r1000))
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(integer-0-999->string r1000 #t)))
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(if (= r1000 0)
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str
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(string-append (integer-0-999->string r1000)
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" "
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(vector-ref thousands-names thousand-power)
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(if (> (string-length str) 0) " " "")
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str)))
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(+ thousand-power 1)
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q1000))))))
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(else
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"at least 10^102")))
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;;; (exact-number-description z) -=> string?
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;;; z : (and/c number? exact?)
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;;; Returns a string describing the exact number, z.
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(define (exact-number-description z)
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(cond ((fixnum? z)
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(if (zero? z)
|
||||
(format "~a is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) zero" z)
|
||||
(if (byte? z)
|
||||
(format "~s is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) ~a"
|
||||
z (integer->string z))
|
||||
(format "~s is an exact ~a integer fixnum ~a"
|
||||
z (if (negative? z) "negative" "positive")
|
||||
(integer->string z)))))
|
||||
((and (integer? z) (< z max-integer->string))
|
||||
(format "~s is an exact ~a integer ~a"
|
||||
z (if (negative? z) "negative" "positive")
|
||||
(integer->string z)))
|
||||
((integer? z)
|
||||
(format "~s is an exact ~a integer value whose absolute value is >= 10^102"
|
||||
z (if (negative? z) "negative" "positive")))
|
||||
((rational? z)
|
||||
(format "~s is an exact ~a rational number with a numerator of ~a and a denominator of ~a"
|
||||
z (if (negative? z) "negative" "positive")
|
||||
(numerator z) (denominator z)))
|
||||
((imaginary? z)
|
||||
(format "~s is an exact ~a imaginary number"
|
||||
z (if (negative? (imag-part z)) "negative" "positive")))
|
||||
((complex? z)
|
||||
(format "~s is an exact complex number whose real part is ~a and whose imaginary part is 0+~ai"
|
||||
z (real-part z) (imag-part z)))
|
||||
(else
|
||||
(format "~s is an exact number" z))))
|
||||
|
||||
;;; (float->string x) -> string?
|
||||
;;; x : (or/c flonum? single-flonum? extflonum? bigfloat?)
|
||||
;;; Returns a string with the exact decimal representation of x. This is only
|
||||
;;; guaranteed for floats - single, double, or extended precision, which are
|
||||
;;; never repeating decimals.
|
||||
(define (float->string x)
|
||||
(define (int->string int)
|
||||
(if (= int 0)
|
||||
"0"
|
||||
(let loop ((str "")
|
||||
(n int))
|
||||
(cond ((= n 0)
|
||||
str)
|
||||
(else
|
||||
(define-values (q r) (quotient/remainder n 10))
|
||||
(loop (string-append (number->string r) str) q))))))
|
||||
(define (frac->string frac)
|
||||
(if (= frac 0)
|
||||
".0"
|
||||
(let loop ((str ".")
|
||||
(f frac))
|
||||
(cond ((= f 0)
|
||||
str)
|
||||
(else
|
||||
(define ten-f (* f 10))
|
||||
(define ten-f-int (truncate ten-f))
|
||||
(define ten-f-frac (- ten-f ten-f-int))
|
||||
(loop (string-append str (number->string ten-f-int)) ten-f-frac))))))
|
||||
;(define sign (sgn x))
|
||||
;(define sign (if (extflonum? x)
|
||||
; (cond ((extfl< x 0.0t0) -1.0)
|
||||
; ((extfl> x 0.0t0) +1.0)
|
||||
; (else 0.0))
|
||||
; (sgn x)))
|
||||
(define sign (cond ((bigfloat? x)
|
||||
(cond ((bf< x 0.bf) -1.0)
|
||||
((bf> x 0.bf) +1.0)
|
||||
(else 0.0)))
|
||||
((extflonum? x)
|
||||
(cond ((extfl< x 0.0t0) -1.0)
|
||||
((extfl> x 0.0t0) +1.0)
|
||||
(else 0.0)))
|
||||
(else
|
||||
(sgn x))))
|
||||
;(define exact-x (abs (inexact->exact x)))
|
||||
;(define exact-x (if (extflonum? x)
|
||||
; (abs (extfl->exact x))
|
||||
; (abs (inexact->exact x))))
|
||||
(define exact-x (cond ((bigfloat? x) (abs (bigfloat->rational x)))
|
||||
((extflonum? x) (abs (extfl->exact x)))
|
||||
(else (inexact->exact x))))
|
||||
(define int (truncate exact-x))
|
||||
(define frac (- exact-x int))
|
||||
(string-append
|
||||
(if (= sign -1) "-" "")
|
||||
(int->string int)
|
||||
(frac->string frac)))
|
||||
|
||||
;;; (inexact-number-description z) -> string?
|
||||
;;; z : (and/c number? inexact?)
|
||||
;;; Returns a string describing the inexact number, z.
|
||||
(define (inexact-number-description z)
|
||||
(cond ((integer? z)
|
||||
(if (zero? z)
|
||||
(format "~a is an inexact integer zero" z)
|
||||
(format "~s is an inexact ~a integer whose exact decimal value is ~a"
|
||||
z (if (negative? z) "negative" "positive")
|
||||
(float->string z))))
|
||||
((real? z)
|
||||
(format "~s is an inexact ~a real number whose exact decimal value is ~a"
|
||||
z (if (negative? z) "negative" "positive")
|
||||
(float->string z)))
|
||||
((imaginary? z)
|
||||
(format "~s is an inexact ~a imaginary number whose exact decimal value is 0+~ai"
|
||||
z (if (negative? (imag-part z)) "negative" "positive")
|
||||
(float->string (imag-part z))))
|
||||
((complex? z)
|
||||
(format "~s is an inexact complex number whose real part ~a and whose imaginary part ~a"
|
||||
z (description (real-part z))
|
||||
(description (make-rectangular 0 (imag-part z)))))
|
||||
(else
|
||||
(format "~s is an inexact number whose exact decimal value is ~a"
|
||||
z (float->string z)))))
|
||||
|
||||
;;; (number-description z) -> string?
|
||||
;;; z : number?
|
||||
;;; Returns a string describing the number, z. It handles infinities and
|
||||
;;; not-a-number directly and dispatches to handle exact or inexact numbers.
|
||||
(define (number-description z)
|
||||
(cond ((eqv? z +inf.0)
|
||||
(format "~s is positive infinity" z))
|
||||
((eqv? z -inf.0)
|
||||
(format "~s is negative infinity" z))
|
||||
((eqv? z +nan.0)
|
||||
(format "~s is not-a-number" z))
|
||||
((exact? z)
|
||||
(exact-number-description z))
|
||||
((inexact? z)
|
||||
(inexact-number-description z))
|
||||
(else
|
||||
(format "~s is a number" z))))
|
||||
|
||||
;;; (extflonum-description x) -> string
|
||||
;;; x : extflonum?
|
||||
;;; Returns a string describing the extended precision floating point number, x.
|
||||
(define (extflonum-description x)
|
||||
(cond ((eqv? x +inf.t)
|
||||
(format "~s is positive infinity" x))
|
||||
((eqv? x -inf.t)
|
||||
(format "~s is negative infinity" x))
|
||||
((eqv? x +nan.t)
|
||||
(format "~s is not-a-number" x))
|
||||
(else
|
||||
(format "~s is an extended precision (80-bit) floating point number whose exact decimal value is ~a"
|
||||
x (float->string x)))))
|
||||
|
||||
;;; (bigfloat-description x) -> string
|
||||
;;; x : extflonum?
|
||||
;;; Returns a string describing the big float, x.
|
||||
(define (bigfloat-description x)
|
||||
(cond ((eqv? x +inf.bf)
|
||||
(format "~s is positive infinity" x))
|
||||
((eqv? x -inf.bf)
|
||||
(format "~s is negative infinity" x))
|
||||
((eqv? x +nan.bf)
|
||||
(format "~s is non-a-number" x))
|
||||
(else
|
||||
(format "~s is a ~a big float with ~a bits of precision"
|
||||
x (if (bfnegative? x) "negative" "positive")
|
||||
(bigfloat-precision x)))))
|
||||
|
||||
;;; (string-description str) -> string?
|
||||
;;; str : string?
|
||||
;;; Returns a string describing the string, str.
|
||||
(define (string-description str)
|
||||
(let ((len (string-length str)))
|
||||
(if (= len 0)
|
||||
(format "~s is an empty string" str)
|
||||
(format "~s is ~a string of length ~a"
|
||||
str (if (immutable? str) "an immutable" "a mutable") len))))
|
||||
|
||||
;;; (byte-string-description bstr) -> string?
|
||||
;;; bstr : string?
|
||||
;;; Returns a string describing the string, bstr.
|
||||
(define (byte-string-description bstr)
|
||||
(let ((len (bytes-length bstr)))
|
||||
(if (= len 0)
|
||||
(format "~s is an empty byte string" bstr)
|
||||
(format "~s is ~a byte string of length ~a"
|
||||
bstr (if (immutable? bstr) "an immutable" "a mutable") len))))
|
||||
|
||||
;;; general-category-alist : (list-of (cons/c symbol? string?))
|
||||
;;; An association list mapping a Unicode general category (as returned by
|
||||
;;; char-general-category) to a string describing it.
|
||||
(define general-category-alist
|
||||
'((lu . "letter, uppercase")
|
||||
(ll . "letter, lowercase")
|
||||
(lt . "letter, titlecase")
|
||||
(lm . "letter, modifier")
|
||||
(lo . "letter, other")
|
||||
(mn . "mark, nonspacing")
|
||||
(mc . "mark, space combining")
|
||||
(me . "mark, enclosing")
|
||||
(nd . "number, decimal digit")
|
||||
(nl . "number, letter")
|
||||
(no . "number, other")
|
||||
(ps . "punctuation, open")
|
||||
(pe . "punctuation, close")
|
||||
(pi . "punctuation, initial quote")
|
||||
(pf . "punctuation, final quote")
|
||||
(pd . "punctuation, dash")
|
||||
(pc . "punctuation, connector")
|
||||
(po . "punctuation, other")
|
||||
(sc . "symbol, currency")
|
||||
(sm . "symbol, math")
|
||||
(sk . "symbol, modifier")
|
||||
(so . "symbol, other")
|
||||
(zs . "separator, space")
|
||||
(zp . "separator, paragraph")
|
||||
(zl . "separator, line")
|
||||
(cc . "other, control")
|
||||
(cf . "other, format")
|
||||
(cs . "other, surrogate")
|
||||
(co . "other, private use")
|
||||
(cn . "other, not assigned")))
|
||||
|
||||
;;; (general-category->string category) -> string?
|
||||
;;; category : symbol?
|
||||
;;; Returns a string with the definition of Unicode general category, category,
|
||||
;;; or "unknown" is category is not known.
|
||||
(define (general-category->string category)
|
||||
(let ((category-assoc (assq category general-category-alist)))
|
||||
(if category-assoc
|
||||
(cdr category-assoc)
|
||||
"unknown")))
|
||||
|
||||
;;; (character-description char) -> string?
|
||||
;;; char : character?
|
||||
;;; Returns a string describing the character, char.
|
||||
(define (character-description char)
|
||||
(let ((code-point (char->integer char))
|
||||
(general-category (char-general-category char)))
|
||||
(format "~s is a character whose code-point number is ~a(#x~x) and general category is '~a (~a)"
|
||||
char code-point code-point
|
||||
general-category (general-category->string general-category))))
|
||||
|
||||
;;; symbol-description sym) -> string?
|
||||
;;; sym : symbol?
|
||||
;;; Returns a string describing the symbol, sym.
|
||||
(define (symbol-description sym)
|
||||
(format "~s is ~a symbol"
|
||||
sym (if (symbol-interned? sym) "an interned" "an uninterned")))
|
||||
|
||||
;;; (regexp-description regexp) -> string?
|
||||
;;; regexp : regexp?
|
||||
;;; Returns a string describinbg the regular expression, regexp.
|
||||
(define (regexp-description regexp)
|
||||
(format "~s is a regular expression in ~a format"
|
||||
regexp (if (pregexp? regexp) "pregexp" "regexp")))
|
||||
|
||||
;;; (byte-regexp-description byte-regexp) -> string?
|
||||
;;; byte-regexp : buteregexp?
|
||||
;;; Returns a string describing the byte regular expression, byte-regexp.
|
||||
(define (byte-regexp-description byte-regexp)
|
||||
(format "~s is a byte regular expression in ~a format"
|
||||
byte-regexp (if (byte-pregexp? byte-regexp) "pregexp" "regexp")))
|
||||
|
||||
;;; (keyword-description kw) -> string?
|
||||
;;; kw : keyword?
|
||||
;;; Returns a string describing the keyword, kw.
|
||||
(define (keyword-description kw)
|
||||
(format "~s is a keyword" kw))
|
||||
|
||||
;;; (list-description lst) -> string?
|
||||
;;; lst : list?
|
||||
;;; Returns a string describing the proper immutable list, lst.
|
||||
(define (list-description lst)
|
||||
(if (null? lst)
|
||||
(format "~s is an empty list" lst)
|
||||
(format "~s is a proper immutable list of length ~a"
|
||||
lst (length lst))))
|
||||
|
||||
;;; (pair-desc pair) -> string?
|
||||
;;; pair : pair?
|
||||
;;; Returns a string describing the improper immutable list, pair. Any pair that
|
||||
;;; is not a proper list is an improper list.
|
||||
(define (pair-description pair)
|
||||
(format "~a is an improper immutable list" pair))
|
||||
|
||||
;;; (mlist-description mlst) -> string?
|
||||
;;; mlst : mlist?
|
||||
;;; Returns a string describing the proper mutable list, mlst.
|
||||
(define (mlist-description mlst)
|
||||
(format "~s is a proper mutable list of length ~a"
|
||||
mlst (mlength mlst)))
|
||||
|
||||
;;; (mpair-desc mpair) -> string?
|
||||
;;; mpair : mpair?
|
||||
;;; Returns a string describing the improper mutable list, mpair. Any mpair that
|
||||
;;; is not a proper mlist is an improper mlist.
|
||||
(define (mpair-description mpair)
|
||||
(format "~a is an improper mutable list" mpair))
|
||||
|
||||
;;; (vector-description v) -> string?
|
||||
;;; v : vector?
|
||||
;;; Returns a string describing the vector, v.
|
||||
(define (vector-description v)
|
||||
(let ((len (vector-length v)))
|
||||
(if (= len 0)
|
||||
(format "~s is an empty vector" v)
|
||||
(format "~s is ~a vector of length ~a"
|
||||
v (if (immutable? v) "an immutable" "a mutable") len))))
|
||||
|
||||
;;; (box-description box) -> string?
|
||||
;;; box : box?
|
||||
;;; Returns a string describing the boxed value, box, and its contents.
|
||||
(define (box-description box)
|
||||
(format "~s is a box containing ~s, ~a"
|
||||
box (unbox box) (description (unbox box))))
|
||||
|
||||
;;; (weak-box-description weak-box) -> string?
|
||||
;;; weak-box : weak-box?
|
||||
;;; Returns a string describing the weak-box value, weak-box, and its contents.
|
||||
(define (weak-box-description weak-box)
|
||||
(format "~s is a weak box containing ~s, ~a"
|
||||
weak-box (weak-box-value weak-box) (description (weak-box-value weak-box))))
|
||||
|
||||
;;; (ephemeron-description eph) -> string?
|
||||
;;; eph : box?
|
||||
;;; Returns a string describing the ephemeron value, eph, and its contents.
|
||||
(define (ephemeron-description eph)
|
||||
(format "~s is an ephemeron containing ~s, ~a"
|
||||
eph (ephemeron-value eph) (description (ephemeron-value eph))))
|
||||
|
||||
;;; (hash-description hash) -> string?
|
||||
;;; hash : hash?
|
||||
;;; Returns a string describing the hash table, hash.
|
||||
(define (hash-description hash)
|
||||
(if (= (hash-count hash) 0)
|
||||
(let ((type (if (hash-weak? hash)
|
||||
"an empty mutable hash table that holds its keys weakly"
|
||||
(if (immutable? hash)
|
||||
"an empty immutable hash table"
|
||||
"a empty mutable hash table")))
|
||||
(compare (if (hash-eq? hash)
|
||||
"eq?"
|
||||
(if (hash-eqv? hash)
|
||||
"eqv?"
|
||||
"equal?"))))
|
||||
(format "~s is ~a and that uses ~a to compare keys"
|
||||
hash type compare))
|
||||
(let ((type (if (hash-weak? hash)
|
||||
"a mutable hash table that holds its keys weakly"
|
||||
(if (immutable? hash)
|
||||
"an immutable hash table"
|
||||
"a mutable hash table")))
|
||||
(compare (if (hash-eq? hash)
|
||||
"eq?"
|
||||
(if (hash-eqv? hash)
|
||||
"eqv?"
|
||||
"equal?"))))
|
||||
(format "~s is ~a and that uses ~a to compare keys~a"
|
||||
hash type compare
|
||||
(for/fold ((key-text ""))
|
||||
(((key value) (in-hash hash)))
|
||||
(string-append key-text
|
||||
(format "~n ~s : ~s, ~a"
|
||||
key value (description value))))))))
|
||||
|
||||
;;; (arity->string arity) -> string?
|
||||
;;; arity : (or/c exact-nonnegative-integer?
|
||||
;;; arity-at-least?
|
||||
;;; (list-of (or/c exact-nonnegative-integer?
|
||||
;;; arity-at-least?)))
|
||||
;;; Returns a string describing the arity of a function as returned by
|
||||
;;; procedure-arity.
|
||||
(define (arity->string arity)
|
||||
(cond ((integer? arity)
|
||||
(number->string arity))
|
||||
((arity-at-least? arity)
|
||||
(format "at least ~a" (arity-at-least-value arity)))
|
||||
(else
|
||||
(let loop ((str "")
|
||||
(tail arity))
|
||||
(let ((arity (car tail)))
|
||||
(if (null? (cdr tail))
|
||||
(string-append str " or " (arity->string arity))
|
||||
(loop (string-append str
|
||||
(if (> (string-length str) 0) ", " "")
|
||||
(arity->string arity))
|
||||
(cdr tail))))))))
|
||||
|
||||
;;; (keyword-list->string kw-lst) -> string?
|
||||
;;; kw-lst : (list-of keyword?)
|
||||
;;; Returns a string with the keywords from the keyword list, kw-lst.
|
||||
(define (keyword-list->string kw-lst)
|
||||
(cond ((= (length kw-lst) 0)
|
||||
"")
|
||||
((= (length kw-lst) 1)
|
||||
(string-append "#:" (keyword->string (car kw-lst))))
|
||||
(else
|
||||
(let/ec exit
|
||||
(let loop ((str "")
|
||||
(tail kw-lst))
|
||||
(if (null? (cdr tail))
|
||||
(exit (string-append str
|
||||
" and "
|
||||
"#:" (keyword->string (car tail))))
|
||||
(loop (string-append str
|
||||
(if (> (string-length str) 0) ", " "")
|
||||
"#:" (keyword->string (car tail)))
|
||||
(cdr tail))))))))
|
||||
|
||||
;;; (procedure-arguments->string proc) -> string?
|
||||
;;; proc : procedure?
|
||||
;;; Returns a string describing the arguments of the procedure, proc.
|
||||
(define (procedure-arguments->string proc)
|
||||
(let ((arity (procedure-arity proc)))
|
||||
(let-values (((required accepted) (procedure-keywords proc)))
|
||||
(format "accepts ~a ~a~a~a"
|
||||
(arity->string arity) (if (eqv? arity 1) "argument" "arguments")
|
||||
(if (null? required)
|
||||
""
|
||||
(format " with keyword ~a ~a"
|
||||
(if (= (length required) 1) "argument" "arguments")
|
||||
(keyword-list->string required)))
|
||||
(if (null? accepted)
|
||||
""
|
||||
(format " plus optional keyword ~a ~a"
|
||||
(if (= (length accepted) 1) "argument" "arguments")
|
||||
(keyword-list->string accepted)))))))
|
||||
|
||||
;;; (primitive-results->string prim) -> string
|
||||
;;; prim : primitive?
|
||||
;;; Returns a string describing the results of the primitive procedure, prim.
|
||||
(define (primitive-results->string prim)
|
||||
(let ((arity (primitive-result-arity prim)))
|
||||
(format "returns ~a ~a"
|
||||
(arity->string arity) (if (eqv? arity 1) "result" "results"))))
|
||||
|
||||
;;; (procedure-description proc) -> string?
|
||||
;;; proc : procedure?
|
||||
;;; Returns a string describing the procedure, proc.
|
||||
(define (procedure-description proc)
|
||||
(cond ((primitive? proc)
|
||||
(let ((result-arity (procedure-arity proc)))
|
||||
(format "~s is a primitive procedure ~athat ~a and ~a"
|
||||
proc
|
||||
(let ((name (object-name proc)))
|
||||
(if name
|
||||
(string-append "named "
|
||||
(symbol->string name)
|
||||
" ")
|
||||
""))
|
||||
(procedure-arguments->string proc)
|
||||
(primitive-results->string proc))))
|
||||
((primitive-closure? proc)
|
||||
(format "~s is a primitive closure ~athat ~a"
|
||||
proc
|
||||
(let ((name (object-name proc)))
|
||||
(if name
|
||||
(string-append "named "
|
||||
(symbol->string name))
|
||||
""))
|
||||
(procedure-arguments->string proc)))
|
||||
(else
|
||||
(format "~s is a procedure ~athat ~a"
|
||||
proc
|
||||
(let ((name (object-name proc)))
|
||||
(if name
|
||||
(string-append "named "
|
||||
(symbol->string name)
|
||||
" ")
|
||||
""))
|
||||
(procedure-arguments->string proc)))))
|
||||
|
||||
;;; (port-description port) -> string?
|
||||
;;; port : port?
|
||||
;;; Returns a string describing the port, port.
|
||||
(define (port-description port)
|
||||
(let ((direction (if (input-port? port)
|
||||
(if (output-port? port)
|
||||
"input-output"
|
||||
"input")
|
||||
(if (output-port? port)
|
||||
"output"
|
||||
"unknown"))))
|
||||
(format "~s is ~a ~a port"
|
||||
port (if (port-closed? port) "a closed" "an open")
|
||||
direction)))
|
||||
|
||||
(define (path-description path)
|
||||
(let ((convention (path-convention-type path)))
|
||||
(format "~s is ~a ~a ~a path"
|
||||
path
|
||||
(if (complete-path? path) "a complete," "an incomplete,")
|
||||
(if (absolute-path? path)
|
||||
"absolute"
|
||||
(if (relative-path? path)
|
||||
"relative"
|
||||
"unknown"))
|
||||
convention)))
|
||||
|
||||
;;; (structure-description struct) -> string
|
||||
(define (structure-description struct)
|
||||
(let ((name (object-name struct)))
|
||||
(format "~s is a structure~a~a"
|
||||
struct
|
||||
(if name (format " of type ~a" name) "")
|
||||
(for/fold ((str ""))
|
||||
((field (in-vector (struct->vector struct)))
|
||||
(i (in-naturals)))
|
||||
(cond ((= i 0)
|
||||
"")
|
||||
((eq? field '...)
|
||||
(string-append str (format "~n ...")))
|
||||
(else
|
||||
(string-append str (format "~n ~a : ~a, ~a"
|
||||
i field (description field)))))))))
|
||||
|
||||
;;; (description x) -> string
|
||||
;;; x : any/c
|
||||
;;; Returns a string describing x.
|
||||
(define (description x)
|
||||
(cond ((boolean? x)
|
||||
(boolean-description x))
|
||||
((number? x)
|
||||
(number-description x))
|
||||
((extflonum? x)
|
||||
(extflonum-description x))
|
||||
((bigfloat? x)
|
||||
(bigfloat-description x))
|
||||
((string? x)
|
||||
(string-description x))
|
||||
((bytes? x)
|
||||
(byte-string-description x))
|
||||
((char? x)
|
||||
(character-description x))
|
||||
((symbol? x)
|
||||
(symbol-description x))
|
||||
((regexp? x)
|
||||
(regexp-description x))
|
||||
((byte-regexp? x)
|
||||
(byte-regexp-description x))
|
||||
((keyword? x)
|
||||
(keyword-description x))
|
||||
((list? x)
|
||||
(list-description x))
|
||||
((pair? x)
|
||||
(pair-description x))
|
||||
((mlist? x)
|
||||
(mlist-description x))
|
||||
((mpair? x)
|
||||
(mpair-description x))
|
||||
((vector? x)
|
||||
(vector-description x))
|
||||
((box? x)
|
||||
(box-description x))
|
||||
((weak-box? x)
|
||||
(weak-box-description x))
|
||||
((hash? x)
|
||||
(hash-description x))
|
||||
((procedure? x)
|
||||
(procedure-description x))
|
||||
((port? x)
|
||||
(port-description x))
|
||||
((void? x)
|
||||
(format "~s is void" x))
|
||||
((eof-object? x)
|
||||
(format "~s is an eof object" x))
|
||||
((path? x)
|
||||
(path-description x))
|
||||
((struct? x)
|
||||
(structure-description x))
|
||||
(else
|
||||
(let ((type (variant x))
|
||||
(name (object-name x)))
|
||||
(if (and object-name
|
||||
(not (eq? type name)))
|
||||
(format "~s is an object of type ~a named ~a"
|
||||
x type name)
|
||||
(format "~s is an object of type ~a"
|
||||
x (variant x)))))))
|
||||
|
||||
;;; (describe x) -> void?
|
||||
;;; x : any/c
|
||||
;;; Prints a description of x.
|
||||
(define (describe x)
|
||||
(printf "~a~n" (description x)))
|
||||
|
||||
;;; Module Contracts
|
||||
|
||||
(provide/contract
|
||||
(variant
|
||||
(-> any/c symbol?))
|
||||
(integer->string
|
||||
(-> exact-integer? string?))
|
||||
(float->string
|
||||
(-> (or/c flonum? single-flonum? extflonum? bigfloat?) string?))
|
||||
(description
|
||||
(-> any/c string?))
|
||||
(describe
|
||||
(-> any/c void?)))
|
@ -0,0 +1,461 @@
|
||||
#lang scribble/doc
|
||||
|
||||
@(require scribble/manual
|
||||
(planet williams/describe/describe)
|
||||
(for-label
|
||||
racket
|
||||
(planet williams/describe/describe)))
|
||||
|
||||
@title[#:tag "describe"]{Describe}
|
||||
|
||||
M. Douglas Williams
|
||||
|
||||
@(author+email @tt{M. Douglas Williams} "doug@cognidrome.org")
|
||||
|
||||
This library provides functions to describe Racket objects. Currently, the following types of objects are described:
|
||||
|
||||
@itemize{
|
||||
@item{Booleans}
|
||||
@item{Numbers}
|
||||
@item{Strings}
|
||||
@item{Byte Strings}
|
||||
@item{Characters}
|
||||
@item{Symbols}
|
||||
@item{Regular Expressions}
|
||||
@item{Byte Regular Expressions}
|
||||
@item{Keywords}
|
||||
@item{Lists and Pairs}
|
||||
@item{Mutable Lists and Pairs}
|
||||
@item{Vectors}
|
||||
@item{Boxes}
|
||||
@item{Weak Boxes}
|
||||
@item{Hash Tables}
|
||||
@item{Procedures}
|
||||
@item{Ports}
|
||||
@item{Void}
|
||||
@item{EOF}
|
||||
@item{Path}
|
||||
@item{Structures}
|
||||
@item{Other Named Things}
|
||||
@item{Other (Unnamed) Things}
|
||||
}
|
||||
|
||||
The describe library is available from the PLaneT repository.
|
||||
|
||||
@defmodule[(planet williams/describe/describe)]
|
||||
|
||||
@table-of-contents[]
|
||||
|
||||
@section{Interface}
|
||||
|
||||
The describe library provides the following functions:
|
||||
|
||||
@defproc[(variant (x any/c)) symbol?]{
|
||||
Returns a symbol identifying the type of @scheme[x]. This is from a post on the Racket mailing list from Robby Findler. The following is a short description of its origin:
|
||||
|
||||
... I'm not sure about always, but at some point a while ago, Matthew decided that all values are structs (in the sense that you could have implemented everything with structs and scope, etc even if some of them are implemented in C) and adapted the primitives to make them behave accordingly.}
|
||||
|
||||
Examples:
|
||||
|
||||
@scheme[(variant (λ (x) x))] -> procedure
|
||||
|
||||
@scheme[(variant 1)] -> fixnum-integer
|
||||
|
||||
@scheme[(variant (let/cc k k))] -> continuation
|
||||
|
||||
@scheme[(variant (let/ec k k))] -> escape-continuation
|
||||
|
||||
@defproc[(integer->string (n exact-integer?)) string?]{
|
||||
Returns a string with the name of the exact integer @scheme[n]. This works for exact integers whose magnitudes are less than 10^102. For values whose magnitudes are greater than or equal to 10^102, the string "at least 10^102" (or "minus at least 10^102") is returned.}
|
||||
|
||||
Examples:
|
||||
|
||||
@scheme[(integer->string 0)] -> "zero"
|
||||
|
||||
@scheme[(integer->string (expt 2 16))] -> "sixty-five thousand five hundred and thirty-six"
|
||||
|
||||
@scheme[(integer->string (expt 10 100))] -> "ten duotrigillion"
|
||||
|
||||
@scheme[(integer->string (expt 10 150))] -> "at least 10^102"
|
||||
|
||||
@defproc[(float->string (x (or/c flonum? single-flonum? extflonum? bigfloat?))) string?]{
|
||||
Returns a string with the exact decimal value of the floating-point number @scheme[x]. This works for single precision, double precision, extended precision, and big floating-point values. Note that internally @scheme[x] is converted to an exact rational number as part of converting to a string and the following warning from the Arbitrary-Precision Floating-Point Numbers (Bigfloats) section in the Math Library is important.
|
||||
|
||||
@bold{Be careful with exact conversions.} Bigfloats with large exponents may not fit in memory as integers or exact rationals. Worse, they might fit, but have all your RAM and swap space for lunch.
|
||||
}
|
||||
|
||||
Examples:
|
||||
|
||||
@scheme[(float->string 0.0)] -> "0.0"
|
||||
|
||||
@scheme[(float->string 1.0)] -> "1.0"
|
||||
|
||||
@scheme[(float->string 0.1s0)] -> "0.100000001490116119384765625"
|
||||
|
||||
@scheme[(float->string 0.1)] -> "0.1000000000000000055511151231257827021181583404541015625"
|
||||
|
||||
@scheme[(float->string 0.1t0)] -> "0.1000000000000000000013552527156068805425093160010874271392822265625"
|
||||
|
||||
@scheme[(float->string (bf 1/10))] -> "0.10000000000000000000000000000000000000007346839692639296924804603357639035486366659729825547009429698164240107871592044830322265625"
|
||||
|
||||
@defproc[(describe (x any/c)) void?]{
|
||||
Prints a description of @scheme[x] to the current output port.}
|
||||
|
||||
Examples:
|
||||
@scheme[(describe (sqrt 10))] @linebreak[]
|
||||
@schemefont{3.1622776601683795 is an inexact positive real number}
|
||||
|
||||
@scheme[(describe (sqrt -10))] @linebreak[]
|
||||
@schemefont{0+3.1622776601683795i is an inexact positive imaginary number}
|
||||
|
||||
@scheme[(describe #\a)] @linebreak[]
|
||||
@schemefont{#\a is the character whose code-point number is 97(#x61) and general category is 'll (letter, lowercase)}
|
||||
|
||||
@scheme[(describe '(this is a proper list))] @linebreak[]
|
||||
@schemefont{(this is a proper list) is a proper immutable list of length 5}
|
||||
|
||||
@scheme[(describe car)] @linebreak[]
|
||||
@schemefont{#<procedure:car> is a primitive procedure named car that accepts 1 argument and returns 1 result}
|
||||
|
||||
@defproc[(description (x any/c)) string?]{
|
||||
Returns a string describing @scheme[x].}
|
||||
|
||||
@section{Example}
|
||||
|
||||
The following example demonstrates the varions function of the describe library.
|
||||
|
||||
@#reader scribble/comment-reader
|
||||
(schememod
|
||||
racket
|
||||
|
||||
(require scheme/mpair)
|
||||
(require (planet williams/describe/describe))
|
||||
|
||||
;;; Booleans
|
||||
(printf "~n--- Booleans ---~n")
|
||||
(describe #t)
|
||||
(describe #f)
|
||||
|
||||
;;; Numbers
|
||||
(printf "~n--- Numbers ---~n")
|
||||
|
||||
(define (! n)
|
||||
(if (= n 0)
|
||||
1
|
||||
(* n (! (sub1 n)))))
|
||||
|
||||
(describe +inf.0)
|
||||
(describe -inf.0)
|
||||
(describe +nan.0)
|
||||
|
||||
(describe 0)
|
||||
(describe (! 10))
|
||||
(describe (! 40))
|
||||
(describe (- (! 40) (! 41)))
|
||||
(describe (! 100))
|
||||
(describe (/ (! 10) (add1 (! 11))))
|
||||
(describe -1+3i)
|
||||
|
||||
(describe 0.0)
|
||||
(describe 0.1e0)
|
||||
(describe 0.1f0)
|
||||
(describe 0.1t0)
|
||||
(describe (* (! 10) 1.0))
|
||||
(describe 6.0221313e23)
|
||||
(describe 6.0221313f23)
|
||||
(describe 6.0221313t23)
|
||||
(describe (exact->inexact (! 40)))
|
||||
(describe (sqrt 10))
|
||||
(describe (sqrt -10))
|
||||
(describe (+ (sqrt 10) (sqrt -10)))
|
||||
|
||||
(describe (bf 1/10))
|
||||
(describe (bf "15e200000000"))
|
||||
|
||||
;;; Strings
|
||||
|
||||
(printf "~n--- Strings ---~n")
|
||||
(describe "abc")
|
||||
(describe (string #\1 #\2 #\3))
|
||||
|
||||
;;; Byte Strings
|
||||
|
||||
(printf "~n--- Byte Strings ---~n")
|
||||
(describe #"abc")
|
||||
(describe (bytes 48 49 50))
|
||||
|
||||
;;; Characters
|
||||
|
||||
(printf "~n--- Characters ---~n")
|
||||
(describe #\a)
|
||||
(describe #\A)
|
||||
(describe #\0)
|
||||
(describe #\()
|
||||
|
||||
;;; Symbols
|
||||
|
||||
(printf "~n--- Symbols ---~n")
|
||||
(describe 'abc)
|
||||
(describe '|(a + b)|)
|
||||
(describe (gensym))
|
||||
|
||||
;;; Regular Expressions
|
||||
|
||||
(printf "~n--- Regular Expressions ---~n")
|
||||
(describe #rx"Ap*le")
|
||||
(describe #px"Ap*le")
|
||||
|
||||
;;; Byte Regular Expressions
|
||||
|
||||
(printf "~n--- Byte Regular Expressions ---~n")
|
||||
(describe #rx#"Ap*le")
|
||||
(describe #px#"Ap*le")
|
||||
|
||||
;;; Keywords
|
||||
|
||||
(printf "~n--- Keywords ---~n")
|
||||
(describe '#:key)
|
||||
|
||||
;;; Lists and Pairs
|
||||
|
||||
(printf "~n--- Lists and Pairs ---~n")
|
||||
(describe '(this is a proper list))
|
||||
(describe '(this is an improper . list))
|
||||
(describe (list '(this . is) '(also . a) '(proper . list)))
|
||||
|
||||
;;; Mutable Lists and Pairs
|
||||
|
||||
(printf "~n--- Mutable Lists and Pairs ---~n")
|
||||
(describe (mlist 'this 'is 'a 'proper 'list))
|
||||
(describe (mcons 'this (mcons 'is (mcons 'an (mcons 'improper 'list)))))
|
||||
(describe (mlist '(this . is) '(also . a) '(proper . list)))
|
||||
|
||||
;;; Vectors
|
||||
|
||||
(printf "~n--- Vectors ---~n")
|
||||
(describe #(1 2 3))
|
||||
|
||||
;;; Boxes
|
||||
|
||||
(printf "~n--- Boxes ---~n")
|
||||
(describe (box 12))
|
||||
(describe (box (box 'a)))
|
||||
(describe (box (sqrt 10)))
|
||||
|
||||
;;; Weak Boxes
|
||||
|
||||
(printf "~n--- Weak Boxes ---~n")
|
||||
(describe (make-weak-box 12))
|
||||
(describe (make-weak-box (make-weak-box 'a)))
|
||||
(describe (make-weak-box (sqrt 10)))
|
||||
|
||||
;;; Hashes
|
||||
|
||||
(printf "~n--- Hashes ---~n")
|
||||
(describe #hash((a . 12) (b . 14) (c . 16)))
|
||||
(describe #hasheq((a . a) (b . b) (c . c)))
|
||||
(describe #hasheqv((a . #\a) (b . #\b) (c . #\c)))
|
||||
|
||||
(define ht (make-hash))
|
||||
(hash-set! ht 'a 12)
|
||||
(hash-set! ht 'b 14)
|
||||
(hash-set! ht 'c 16)
|
||||
(describe ht)
|
||||
|
||||
(define wht (make-weak-hash))
|
||||
(hash-set! wht 'a 12)
|
||||
(hash-set! wht 'b 14)
|
||||
(hash-set! wht 'c 16)
|
||||
(describe wht)
|
||||
|
||||
;;; Procedures
|
||||
|
||||
(printf "~n--- Procedures ---~n")
|
||||
(describe car)
|
||||
(describe open-output-file)
|
||||
(describe current-input-port)
|
||||
(describe (lambda (x) x))
|
||||
|
||||
;;; Ports
|
||||
|
||||
(printf "~n--- Ports ---~n")
|
||||
(describe (current-input-port))
|
||||
(describe (current-output-port))
|
||||
|
||||
;;; Void
|
||||
|
||||
(printf "~n--- Void ---~n")
|
||||
(describe (void))
|
||||
|
||||
;;; EOF
|
||||
|
||||
(printf "~n--- EOF ---~n")
|
||||
(describe eof)
|
||||
|
||||
;;; Paths
|
||||
|
||||
(printf "~n--- Paths ---~n")
|
||||
(describe (string->path "C:\\Program-files\\PLT"))
|
||||
(describe (string->path "../dir/file.ext"))
|
||||
|
||||
;;; Structures
|
||||
|
||||
(printf "~n--- Structures ---~n")
|
||||
(define-struct transparent-struct (a b c) #:transparent)
|
||||
(define ts-1 (make-transparent-struct 'a 'b 'c))
|
||||
(describe ts-1)
|
||||
|
||||
;;; Other Named Things (I.E., Opaque Structures)
|
||||
|
||||
(printf "~n--- Other Named Things ---~n")
|
||||
(define-struct opaque-struct (a b c))
|
||||
(define os-1 (make-opaque-struct 'a 'b 'c))
|
||||
(describe os-1)
|
||||
)
|
||||
|
||||
Produces the following output.
|
||||
|
||||
@verbatim{
|
||||
|
||||
--- Booleans ---
|
||||
#t is a Boolean true
|
||||
#f is a Boolean false
|
||||
|
||||
--- Numbers ---
|
||||
+inf.0 is positive infinity
|
||||
-inf.0 is negative infinity
|
||||
+nan.0 is not-a-number
|
||||
0 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) zero
|
||||
3628800 is an exact positive integer fixnum three million six hundred twenty-eight thousand eight hundred
|
||||
815915283247897734345611269596115894272000000000 is an exact positive integer eight hundred fifteen quattuordecillion nine hundred fifteen tredecillion two hundred eighty-three duodecillion two hundred forty-seven undecillion eight hundred ninety-seven decillion seven hundred thirty-four nonillion three hundred forty-five octillion six hundred eleven septillion two hundred sixty-nine sextillion five hundred ninety-six quintillion one hundred fifteen quadrillion eight hundred ninety-four trillion two hundred seventy-two billion
|
||||
-32636611329915909373824450783844635770880000000000 is an exact negative integer minus thirty-two quindecillion six hundred thirty-six quattuordecillion six hundred eleven tredecillion three hundred twenty-nine duodecillion nine hundred fifteen undecillion nine hundred nine decillion three hundred seventy-three nonillion eight hundred twenty-four octillion four hundred fifty septillion seven hundred eighty-three sextillion eight hundred forty-four quintillion six hundred thirty-five quadrillion seven hundred seventy trillion eight hundred eighty billion
|
||||
93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000 is an exact positive integer value whose absolute value is >= 10^102
|
||||
3628800/39916801 is an exact positive rational number with a numerator of 3628800 and a denominator of 39916801
|
||||
-1+3i is an exact complex number whose real part is -1 and whose imaginary part is 0+3i
|
||||
0.0 is an inexact integer zero
|
||||
0.1 is an inexact positive real number whose exact decimal value is .1000000000000000055511151231257827021181583404541015625
|
||||
0.1f0 is an inexact positive real number whose exact decimal value is .100000001490116119384765625
|
||||
0.1t0 is an extended precision (80-bit) floating point number whose exact decimal value is .1000000000000000000013552527156068805425093160010874271392822265625
|
||||
3628800.0 is an inexact positive integer whose exact decimal value is 3628800.
|
||||
6.0221313e+023 is an inexact positive integer whose exact decimal value is 602213130000000012517376.
|
||||
6.0221313f+023 is an inexact positive integer whose exact decimal value is 602213127606262401335296.
|
||||
6.0221313t+023 is an extended precision (80-bit) floating point number whose exact decimal value is 602213130000000000000000.
|
||||
8.159152832478977e+047 is an inexact positive integer whose exact decimal value is 815915283247897683795548521301193790359984930816.
|
||||
3.1622776601683795 is an inexact positive real number whose exact decimal value is 3.162277660168379522787063251598738133907318115234375
|
||||
0+3.1622776601683795i is an inexact positive imaginary number whose exact decimal value is 0+3.162277660168379522787063251598738133907318115234375i
|
||||
3.1622776601683795+3.1622776601683795i is an inexact complex number whose real part 3.1622776601683795 is an inexact positive real number whose exact decimal value is 3.162277660168379522787063251598738133907318115234375 and whose imaginary part 0+3.1622776601683795i is an inexact positive imaginary number whose exact decimal value is 0+3.162277660168379522787063251598738133907318115234375i
|
||||
(bf #e0.1000000000000000000000000000000000000001) is a positive big float with 128 bits of precision
|
||||
(bf "1.499999999999999999999999999999999999998e200000001") is a positive big float with 128 bits of precision
|
||||
|
||||
--- Strings ---
|
||||
"abc" is an immutable string of length 3
|
||||
"123" is a mutable string of length 3
|
||||
|
||||
--- Byte Strings ---
|
||||
#"abc" is an immutable byte string of length 3
|
||||
#"012" is a mutable byte string of length 3
|
||||
|
||||
--- Characters ---
|
||||
#\a is a character whose code-point number is 97(#x61) and general category is 'll (letter, lowercase)
|
||||
#\A is a character whose code-point number is 65(#x41) and general category is 'lu (letter, uppercase)
|
||||
#\0 is a character whose code-point number is 48(#x30) and general category is 'nd (number, decimal digit)
|
||||
#\( is a character whose code-point number is 40(#x28) and general category is 'ps (punctuation, open)
|
||||
|
||||
--- Symbols ---
|
||||
abc is an interned symbol
|
||||
|(a + b)| is an interned symbol
|
||||
g1454 is an uninterned symbol
|
||||
|
||||
--- Regular Expressions ---
|
||||
#rx"Ap*le" is a regular expression in regexp format
|
||||
#px"Ap*le" is a regular expression in pregexp format
|
||||
|
||||
--- Byte Regular Expressions ---
|
||||
#rx#"Ap*le" is a byte regular expression in regexp format
|
||||
#px#"Ap*le" is a byte regular expression in pregexp format
|
||||
|
||||
--- Keywords ---
|
||||
#:key is a keyword
|
||||
|
||||
--- Lists and Pairs ---
|
||||
(this is a proper list) is a proper immutable list of length 5
|
||||
(this is an improper . list) is an improper immutable list
|
||||
((this . is) (also . a) (proper . list)) is a proper immutable list of length 3
|
||||
|
||||
--- Mutable Lists and Pairs ---
|
||||
{this is a proper list} is a proper mutable list of length 5
|
||||
{this is an improper . list} is an improper mutable list
|
||||
{(this . is) (also . a) (proper . list)} is a proper mutable list of length 3
|
||||
|
||||
--- Vectors ---
|
||||
#(1 2 3) is an immutable vector of length 3
|
||||
|
||||
--- Boxes ---
|
||||
#&12 is a box containing 12, 12 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) twelve
|
||||
#&#&a is a box containing #&a, #&a is a box containing a, a is an interned symbol
|
||||
#&3.1622776601683795 is a box containing 3.1622776601683795, 3.1622776601683795 is an inexact positive real number whose exact decimal value is 3.162277660168379522787063251598738133907318115234375
|
||||
|
||||
--- Weak Boxes ---
|
||||
#<weak-box> is a weak box containing 12, 12 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) twelve
|
||||
#<weak-box> is a weak box containing #<weak-box>, #<weak-box> is a weak box containing a, a is an interned symbol
|
||||
#<weak-box> is a weak box containing 3.1622776601683795, 3.1622776601683795 is an inexact positive real number whose exact decimal value is 3.162277660168379522787063251598738133907318115234375
|
||||
|
||||
--- Hashes ---
|
||||
#hash((a . 12) (b . 14) (c . 16)) is an immutable hash table and that uses equal? to compare keys
|
||||
a : 12, 12 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) twelve
|
||||
b : 14, 14 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) fourteen
|
||||
c : 16, 16 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) sixteen
|
||||
#hasheq((a . a) (b . b) (c . c)) is an immutable hash table and that uses eq? to compare keys
|
||||
a : a, a is an interned symbol
|
||||
b : b, b is an interned symbol
|
||||
c : c, c is an interned symbol
|
||||
#hasheqv((a . #\a) (b . #\b) (c . #\c)) is an immutable hash table and that uses eqv? to compare keys
|
||||
a : #\a, #\a is a character whose code-point number is 97(#x61) and general category is 'll (letter, lowercase)
|
||||
b : #\b, #\b is a character whose code-point number is 98(#x62) and general category is 'll (letter, lowercase)
|
||||
c : #\c, #\c is a character whose code-point number is 99(#x63) and general category is 'll (letter, lowercase)
|
||||
#hash((c . 16) (a . 12) (b . 14)) is a mutable hash table and that uses equal? to compare keys
|
||||
c : 16, 16 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) sixteen
|
||||
a : 12, 12 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) twelve
|
||||
b : 14, 14 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) fourteen
|
||||
#<hash> is a mutable hash table that holds its keys weakly and that uses equal? to compare keys
|
||||
c : 16, 16 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) sixteen
|
||||
a : 12, 12 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) twelve
|
||||
b : 14, 14 is a byte (i.e., an exact positive integer fixnum between 0 and 255 inclusive) fourteen
|
||||
|
||||
--- Procedures ---
|
||||
#<procedure:car> is a primitive procedure named car that accepts 1 argument and returns 1 result
|
||||
#<procedure:open-output-file> is a procedure named open-output-file that accepts 1 argument plus optional keyword arguments #:exists and #:mode
|
||||
#<procedure:current-input-port> is a primitive procedure named current-input-port that accepts 0 or 1 arguments and returns 1 result
|
||||
#<procedure:...escribe-test.rkt:156:10> is a procedure named ...escribe-test.rkt:156:10 that accepts 1 argument
|
||||
|
||||
--- Ports ---
|
||||
#<input-port:unsaved-editor326> is an open input port
|
||||
#<output-port> is an open output port
|
||||
|
||||
--- Void ---
|
||||
#<void> is void
|
||||
|
||||
--- EOF ---
|
||||
#<eof> is an eof object
|
||||
|
||||
--- Paths ---
|
||||
#<path:C:\Program-files\PLT> is a complete, absolute windows path
|
||||
#<path:../dir/file.ext> is an incomplete, relative windows path
|
||||
|
||||
--- Structures ---
|
||||
#(struct:transparent-struct a b c) is a structure of type transparent-struct
|
||||
1 : a, a is an interned symbol
|
||||
2 : b, b is an interned symbol
|
||||
3 : c, c is an interned symbol
|
||||
|
||||
--- Other Named Things ---
|
||||
#<opaque-struct> is an object of type opaque-struct
|
||||
}
|
||||
|
||||
@section{Issues and Comments}
|
||||
|
||||
There are undoubtably object types that I have missed and, since Racket is a language that is being actively developed, new object types are sometimes added. If you come across something that is missing, either send me an e-mail or post it on the Racket mailing list.
|
||||
|
||||
The @scheme[describe] function should probably have an optional or keyword argument to specify the output port.
|
||||
|
||||
It would be nice to come up with a way to allow developers to extend the describe library for new object types. Perhaps via something like a @schemefont{prop:custom-describe} structure type property.
|
@ -0,0 +1,39 @@
|
||||
#lang racket
|
||||
|
||||
(require math/bigfloat)
|
||||
(require (planet williams/describe/describe))
|
||||
|
||||
(printf "--- Using literals (big float) ---~n")
|
||||
(describe (bf 1/10))
|
||||
(describe (bf 2/10))
|
||||
(describe (bf 3/10))
|
||||
(describe (bf 4/10))
|
||||
(describe (bf 5/10))
|
||||
(describe (bf 6/10))
|
||||
(describe (bf 7/10))
|
||||
(describe (bf 8/10))
|
||||
(describe (bf 9/10))
|
||||
(describe (bf 10/10))
|
||||
|
||||
(printf "--- Exact decimal values of big floats ---~n")
|
||||
(float->string (bf 1/10))
|
||||
(float->string (bf 2/10))
|
||||
(float->string (bf 3/10))
|
||||
(float->string (bf 4/10))
|
||||
(float->string (bf 5/10))
|
||||
(float->string (bf 6/10))
|
||||
(float->string (bf 7/10))
|
||||
(float->string (bf 8/10))
|
||||
(float->string (bf 9/10))
|
||||
(float->string (bf 10/10))
|
||||
|
||||
(printf "--- Using summation (big float) ---~n")
|
||||
(for/fold ((sum 0.bf))
|
||||
((i (in-range 10)))
|
||||
(define new-sum (bf+ sum (bf 1/10)))
|
||||
(describe new-sum)
|
||||
new-sum)
|
||||
|
||||
(printf "--- Using product (big float) ---~n")
|
||||
(for ((i (in-range 1 11)))
|
||||
(describe (bf* (bf i) (bf 1/10))))
|
@ -0,0 +1,26 @@
|
||||
#lang racket
|
||||
|
||||
(require (planet williams/describe/describe))
|
||||
|
||||
(printf "--- Using literals (double precision) ---~n")
|
||||
(describe 0.1)
|
||||
(describe 0.2)
|
||||
(describe 0.3)
|
||||
(describe 0.4)
|
||||
(describe 0.5)
|
||||
(describe 0.6)
|
||||
(describe 0.7)
|
||||
(describe 0.8)
|
||||
(describe 0.9)
|
||||
(describe 1.0)
|
||||
|
||||
(printf "--- Using summation (double precision) ---~n")
|
||||
(for/fold ((sum 0.0))
|
||||
((i (in-range 10)))
|
||||
(define new-sum (+ sum 0.1))
|
||||
(describe new-sum)
|
||||
new-sum)
|
||||
|
||||
(printf "--- Using product (double precision) ---~n")
|
||||
(for ((i (in-range 1 11)))
|
||||
(describe (* i 0.1)))
|
@ -0,0 +1,27 @@
|
||||
#lang racket
|
||||
|
||||
(require racket/extflonum)
|
||||
(require (planet williams/describe/describe))
|
||||
|
||||
(printf "--- Using literals (extended precision) ---~n")
|
||||
(describe 0.1t0)
|
||||
(describe 0.2t0)
|
||||
(describe 0.3t0)
|
||||
(describe 0.4t0)
|
||||
(describe 0.5t0)
|
||||
(describe 0.6t0)
|
||||
(describe 0.7t0)
|
||||
(describe 0.8t0)
|
||||
(describe 0.9t0)
|
||||
(describe 1.0t0)
|
||||
|
||||
(printf "--- Using summation (extended precision) ---~n")
|
||||
(for/fold ((sum 0.0t0))
|
||||
((i (in-range 10)))
|
||||
(define new-sum (extfl+ sum 0.1t0))
|
||||
(describe new-sum)
|
||||
new-sum)
|
||||
|
||||
(printf "--- Using product (single precision) ---~n")
|
||||
(for ((i (in-range 1 11)))
|
||||
(describe (extfl* (->extfl i) 0.1t0)))
|
@ -0,0 +1,26 @@
|
||||
#lang racket
|
||||
|
||||
(require (planet williams/describe/describe))
|
||||
|
||||
(printf "--- Using literals (single precision) ---~n")
|
||||
(describe 0.1s0)
|
||||
(describe 0.2s0)
|
||||
(describe 0.3s0)
|
||||
(describe 0.4s0)
|
||||
(describe 0.5s0)
|
||||
(describe 0.6s0)
|
||||
(describe 0.7s0)
|
||||
(describe 0.8s0)
|
||||
(describe 0.9s0)
|
||||
(describe 1.0s0)
|
||||
|
||||
(printf "--- Using summation (single precision) ---~n")
|
||||
(for/fold ((sum 0.0s0))
|
||||
((i (in-range 10)))
|
||||
(define new-sum (+ sum 0.1s0))
|
||||
(describe new-sum)
|
||||
new-sum)
|
||||
|
||||
(printf "--- Using product (single precision) ---~n")
|
||||
(for ((i (in-range 1 11)))
|
||||
(describe (* i 0.1s0)))
|
@ -0,0 +1,15 @@
|
||||
#lang setup/infotab
|
||||
(define name "Describe")
|
||||
(define collection "Describe")
|
||||
(define blurb
|
||||
(list "This library provides routines to describe Racket objects."))
|
||||
(define scribblings '(("describe.scrbl" ())))
|
||||
(define categories '(io misc))
|
||||
(define primary-file "describe.rkt")
|
||||
(define release-notes
|
||||
(list "The function float->string is now exported. It was also extended "
|
||||
"to support big floats from the Math Library. Note that descriptions "
|
||||
"of big floats do not include the exact decimal value because of the "
|
||||
"possibility of extremely large value exhausting memory."))
|
||||
(define repositories '("4.x"))
|
||||
(define required-core-version "5.0")
|
@ -0,0 +1,674 @@
|
||||
GNU GENERAL PUBLIC LICENSE
|
||||
Version 3, 29 June 2007
|
||||
|
||||
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
|
||||
Everyone is permitted to copy and distribute verbatim copies
|
||||
of this license document, but changing it is not allowed.
|
||||
|
||||
Preamble
|
||||
|
||||
The GNU General Public License is a free, copyleft license for
|
||||
software and other kinds of works.
|
||||
|
||||
The licenses for most software and other practical works are designed
|
||||
to take away your freedom to share and change the works. By contrast,
|
||||
the GNU General Public License is intended to guarantee your freedom to
|
||||
share and change all versions of a program--to make sure it remains free
|
||||
software for all its users. We, the Free Software Foundation, use the
|
||||
GNU General Public License for most of our software; it applies also to
|
||||
any other work released this way by its authors. You can apply it to
|
||||
your programs, too.
|
||||
|
||||
When we speak of free software, we are referring to freedom, not
|
||||
price. Our General Public Licenses are designed to make sure that you
|
||||
have the freedom to distribute copies of free software (and charge for
|
||||
them if you wish), that you receive source code or can get it if you
|
||||
want it, that you can change the software or use pieces of it in new
|
||||
free programs, and that you know you can do these things.
|
||||
|
||||
To protect your rights, we need to prevent others from denying you
|
||||
these rights or asking you to surrender the rights. Therefore, you have
|
||||
certain responsibilities if you distribute copies of the software, or if
|
||||
you modify it: responsibilities to respect the freedom of others.
|
||||
|
||||
For example, if you distribute copies of such a program, whether
|
||||
gratis or for a fee, you must pass on to the recipients the same
|
||||
freedoms that you received. You must make sure that they, too, receive
|
||||
or can get the source code. And you must show them these terms so they
|
||||
know their rights.
|
||||
|
||||
Developers that use the GNU GPL protect your rights with two steps:
|
||||
(1) assert copyright on the software, and (2) offer you this License
|
||||
giving you legal permission to copy, distribute and/or modify it.
|
||||
|
||||
For the developers' and authors' protection, the GPL clearly explains
|
||||
that there is no warranty for this free software. For both users' and
|
||||
authors' sake, the GPL requires that modified versions be marked as
|
||||
changed, so that their problems will not be attributed erroneously to
|
||||
authors of previous versions.
|
||||
|
||||
Some devices are designed to deny users access to install or run
|
||||
modified versions of the software inside them, although the manufacturer
|
||||
can do so. This is fundamentally incompatible with the aim of
|
||||
protecting users' freedom to change the software. The systematic
|
||||
pattern of such abuse occurs in the area of products for individuals to
|
||||
use, which is precisely where it is most unacceptable. Therefore, we
|
||||
have designed this version of the GPL to prohibit the practice for those
|
||||
products. If such problems arise substantially in other domains, we
|
||||
stand ready to extend this provision to those domains in future versions
|
||||
of the GPL, as needed to protect the freedom of users.
|
||||
|
||||
Finally, every program is threatened constantly by software patents.
|
||||
States should not allow patents to restrict development and use of
|
||||
software on general-purpose computers, but in those that do, we wish to
|
||||
avoid the special danger that patents applied to a free program could
|
||||
make it effectively proprietary. To prevent this, the GPL assures that
|
||||
patents cannot be used to render the program non-free.
|
||||
|
||||
The precise terms and conditions for copying, distribution and
|
||||
modification follow.
|
||||
|
||||
TERMS AND CONDITIONS
|
||||
|
||||
0. Definitions.
|
||||
|
||||
"This License" refers to version 3 of the GNU General Public License.
|
||||
|
||||
"Copyright" also means copyright-like laws that apply to other kinds of
|
||||
works, such as semiconductor masks.
|
||||
|
||||
"The Program" refers to any copyrightable work licensed under this
|
||||
License. Each licensee is addressed as "you". "Licensees" and
|
||||
"recipients" may be individuals or organizations.
|
||||
|
||||
To "modify" a work means to copy from or adapt all or part of the work
|
||||
in a fashion requiring copyright permission, other than the making of an
|
||||
exact copy. The resulting work is called a "modified version" of the
|
||||
earlier work or a work "based on" the earlier work.
|
||||
|
||||
A "covered work" means either the unmodified Program or a work based
|
||||
on the Program.
|
||||
|
||||
To "propagate" a work means to do anything with it that, without
|
||||
permission, would make you directly or secondarily liable for
|
||||
infringement under applicable copyright law, except executing it on a
|
||||
computer or modifying a private copy. Propagation includes copying,
|
||||
distribution (with or without modification), making available to the
|
||||
public, and in some countries other activities as well.
|
||||
|
||||
To "convey" a work means any kind of propagation that enables other
|
||||
parties to make or receive copies. Mere interaction with a user through
|
||||
a computer network, with no transfer of a copy, is not conveying.
|
||||
|
||||
An interactive user interface displays "Appropriate Legal Notices"
|
||||
to the extent that it includes a convenient and prominently visible
|
||||
feature that (1) displays an appropriate copyright notice, and (2)
|
||||
tells the user that there is no warranty for the work (except to the
|
||||
extent that warranties are provided), that licensees may convey the
|
||||
work under this License, and how to view a copy of this License. If
|
||||
the interface presents a list of user commands or options, such as a
|
||||
menu, a prominent item in the list meets this criterion.
|
||||
|
||||
1. Source Code.
|
||||
|
||||
The "source code" for a work means the preferred form of the work
|
||||
for making modifications to it. "Object code" means any non-source
|
||||
form of a work.
|
||||
|
||||
A "Standard Interface" means an interface that either is an official
|
||||
standard defined by a recognized standards body, or, in the case of
|
||||
interfaces specified for a particular programming language, one that
|
||||
is widely used among developers working in that language.
|
||||
|
||||
The "System Libraries" of an executable work include anything, other
|
||||
than the work as a whole, that (a) is included in the normal form of
|
||||
packaging a Major Component, but which is not part of that Major
|
||||
Component, and (b) serves only to enable use of the work with that
|
||||
Major Component, or to implement a Standard Interface for which an
|
||||
implementation is available to the public in source code form. A
|
||||
"Major Component", in this context, means a major essential component
|
||||
(kernel, window system, and so on) of the specific operating system
|
||||
(if any) on which the executable work runs, or a compiler used to
|
||||
produce the work, or an object code interpreter used to run it.
|
||||
|
||||
The "Corresponding Source" for a work in object code form means all
|
||||
the source code needed to generate, install, and (for an executable
|
||||
work) run the object code and to modify the work, including scripts to
|
||||
control those activities. However, it does not include the work's
|
||||
System Libraries, or general-purpose tools or generally available free
|
||||
programs which are used unmodified in performing those activities but
|
||||
which are not part of the work. For example, Corresponding Source
|
||||
includes interface definition files associated with source files for
|
||||
the work, and the source code for shared libraries and dynamically
|
||||
linked subprograms that the work is specifically designed to require,
|
||||
such as by intimate data communication or control flow between those
|
||||
subprograms and other parts of the work.
|
||||
|
||||
The Corresponding Source need not include anything that users
|
||||
can regenerate automatically from other parts of the Corresponding
|
||||
Source.
|
||||
|
||||
The Corresponding Source for a work in source code form is that
|
||||
same work.
|
||||
|
||||
2. Basic Permissions.
|
||||
|
||||
All rights granted under this License are granted for the term of
|
||||
copyright on the Program, and are irrevocable provided the stated
|
||||
conditions are met. This License explicitly affirms your unlimited
|
||||
permission to run the unmodified Program. The output from running a
|
||||
covered work is covered by this License only if the output, given its
|
||||
content, constitutes a covered work. This License acknowledges your
|
||||
rights of fair use or other equivalent, as provided by copyright law.
|
||||
|
||||
You may make, run and propagate covered works that you do not
|
||||
convey, without conditions so long as your license otherwise remains
|
||||
in force. You may convey covered works to others for the sole purpose
|
||||
of having them make modifications exclusively for you, or provide you
|
||||
with facilities for running those works, provided that you comply with
|
||||
the terms of this License in conveying all material for which you do
|
||||
not control copyright. Those thus making or running the covered works
|
||||
for you must do so exclusively on your behalf, under your direction
|
||||
and control, on terms that prohibit them from making any copies of
|
||||
your copyrighted material outside their relationship with you.
|
||||
|
||||
Conveying under any other circumstances is permitted solely under
|
||||
the conditions stated below. Sublicensing is not allowed; section 10
|
||||
makes it unnecessary.
|
||||
|
||||
3. Protecting Users' Legal Rights From Anti-Circumvention Law.
|
||||
|
||||
No covered work shall be deemed part of an effective technological
|
||||
measure under any applicable law fulfilling obligations under article
|
||||
11 of the WIPO copyright treaty adopted on 20 December 1996, or
|
||||
similar laws prohibiting or restricting circumvention of such
|
||||
measures.
|
||||
|
||||
When you convey a covered work, you waive any legal power to forbid
|
||||
circumvention of technological measures to the extent such circumvention
|
||||
is effected by exercising rights under this License with respect to
|
||||
the covered work, and you disclaim any intention to limit operation or
|
||||
modification of the work as a means of enforcing, against the work's
|
||||
users, your or third parties' legal rights to forbid circumvention of
|
||||
technological measures.
|
||||
|
||||
4. Conveying Verbatim Copies.
|
||||
|
||||
You may convey verbatim copies of the Program's source code as you
|
||||
receive it, in any medium, provided that you conspicuously and
|
||||
appropriately publish on each copy an appropriate copyright notice;
|
||||
keep intact all notices stating that this License and any
|
||||
non-permissive terms added in accord with section 7 apply to the code;
|
||||
keep intact all notices of the absence of any warranty; and give all
|
||||
recipients a copy of this License along with the Program.
|
||||
|
||||
You may charge any price or no price for each copy that you convey,
|
||||
and you may offer support or warranty protection for a fee.
|
||||
|
||||
5. Conveying Modified Source Versions.
|
||||
|
||||
You may convey a work based on the Program, or the modifications to
|
||||
produce it from the Program, in the form of source code under the
|
||||
terms of section 4, provided that you also meet all of these conditions:
|
||||
|
||||
a) The work must carry prominent notices stating that you modified
|
||||
it, and giving a relevant date.
|
||||
|
||||
b) The work must carry prominent notices stating that it is
|
||||
released under this License and any conditions added under section
|
||||
7. This requirement modifies the requirement in section 4 to
|
||||
"keep intact all notices".
|
||||
|
||||
c) You must license the entire work, as a whole, under this
|
||||
License to anyone who comes into possession of a copy. This
|
||||
License will therefore apply, along with any applicable section 7
|
||||
additional terms, to the whole of the work, and all its parts,
|
||||
regardless of how they are packaged. This License gives no
|
||||
permission to license the work in any other way, but it does not
|
||||
invalidate such permission if you have separately received it.
|
||||
|
||||
d) If the work has interactive user interfaces, each must display
|
||||
Appropriate Legal Notices; however, if the Program has interactive
|
||||
interfaces that do not display Appropriate Legal Notices, your
|
||||
work need not make them do so.
|
||||
|
||||
A compilation of a covered work with other separate and independent
|
||||
works, which are not by their nature extensions of the covered work,
|
||||
and which are not combined with it such as to form a larger program,
|
||||
in or on a volume of a storage or distribution medium, is called an
|
||||
"aggregate" if the compilation and its resulting copyright are not
|
||||
used to limit the access or legal rights of the compilation's users
|
||||
beyond what the individual works permit. Inclusion of a covered work
|
||||
in an aggregate does not cause this License to apply to the other
|
||||
parts of the aggregate.
|
||||
|
||||
6. Conveying Non-Source Forms.
|
||||
|
||||
You may convey a covered work in object code form under the terms
|
||||
of sections 4 and 5, provided that you also convey the
|
||||
machine-readable Corresponding Source under the terms of this License,
|
||||
in one of these ways:
|
||||
|
||||
a) Convey the object code in, or embodied in, a physical product
|
||||
(including a physical distribution medium), accompanied by the
|
||||
Corresponding Source fixed on a durable physical medium
|
||||
customarily used for software interchange.
|
||||
|
||||
b) Convey the object code in, or embodied in, a physical product
|
||||
(including a physical distribution medium), accompanied by a
|
||||
written offer, valid for at least three years and valid for as
|
||||
long as you offer spare parts or customer support for that product
|
||||
model, to give anyone who possesses the object code either (1) a
|
||||
copy of the Corresponding Source for all the software in the
|
||||
product that is covered by this License, on a durable physical
|
||||
medium customarily used for software interchange, for a price no
|
||||
more than your reasonable cost of physically performing this
|
||||
conveying of source, or (2) access to copy the
|
||||
Corresponding Source from a network server at no charge.
|
||||
|
||||
c) Convey individual copies of the object code with a copy of the
|
||||
written offer to provide the Corresponding Source. This
|
||||
alternative is allowed only occasionally and noncommercially, and
|
||||
only if you received the object code with such an offer, in accord
|
||||
with subsection 6b.
|
||||
|
||||
d) Convey the object code by offering access from a designated
|
||||
place (gratis or for a charge), and offer equivalent access to the
|
||||
Corresponding Source in the same way through the same place at no
|
||||
further charge. You need not require recipients to copy the
|
||||
Corresponding Source along with the object code. If the place to
|
||||
copy the object code is a network server, the Corresponding Source
|
||||
may be on a different server (operated by you or a third party)
|
||||
that supports equivalent copying facilities, provided you maintain
|
||||
clear directions next to the object code saying where to find the
|
||||
Corresponding Source. Regardless of what server hosts the
|
||||
Corresponding Source, you remain obligated to ensure that it is
|
||||
available for as long as needed to satisfy these requirements.
|
||||
|
||||
e) Convey the object code using peer-to-peer transmission, provided
|
||||
you inform other peers where the object code and Corresponding
|
||||
Source of the work are being offered to the general public at no
|
||||
charge under subsection 6d.
|
||||
|
||||
A separable portion of the object code, whose source code is excluded
|
||||
from the Corresponding Source as a System Library, need not be
|
||||
included in conveying the object code work.
|
||||
|
||||
A "User Product" is either (1) a "consumer product", which means any
|
||||
tangible personal property which is normally used for personal, family,
|
||||
or household purposes, or (2) anything designed or sold for incorporation
|
||||
into a dwelling. In determining whether a product is a consumer product,
|
||||
doubtful cases shall be resolved in favor of coverage. For a particular
|
||||
product received by a particular user, "normally used" refers to a
|
||||
typical or common use of that class of product, regardless of the status
|
||||
of the particular user or of the way in which the particular user
|
||||
actually uses, or expects or is expected to use, the product. A product
|
||||
is a consumer product regardless of whether the product has substantial
|
||||
commercial, industrial or non-consumer uses, unless such uses represent
|
||||
the only significant mode of use of the product.
|
||||
|
||||
"Installation Information" for a User Product means any methods,
|
||||
procedures, authorization keys, or other information required to install
|
||||
and execute modified versions of a covered work in that User Product from
|
||||
a modified version of its Corresponding Source. The information must
|
||||
suffice to ensure that the continued functioning of the modified object
|
||||
code is in no case prevented or interfered with solely because
|
||||
modification has been made.
|
||||
|
||||
If you convey an object code work under this section in, or with, or
|
||||
specifically for use in, a User Product, and the conveying occurs as
|
||||
part of a transaction in which the right of possession and use of the
|
||||
User Product is transferred to the recipient in perpetuity or for a
|
||||
fixed term (regardless of how the transaction is characterized), the
|
||||
Corresponding Source conveyed under this section must be accompanied
|
||||
by the Installation Information. But this requirement does not apply
|
||||
if neither you nor any third party retains the ability to install
|
||||
modified object code on the User Product (for example, the work has
|
||||
been installed in ROM).
|
||||
|
||||
The requirement to provide Installation Information does not include a
|
||||
requirement to continue to provide support service, warranty, or updates
|
||||
for a work that has been modified or installed by the recipient, or for
|
||||
the User Product in which it has been modified or installed. Access to a
|
||||
network may be denied when the modification itself materially and
|
||||
adversely affects the operation of the network or violates the rules and
|
||||
protocols for communication across the network.
|
||||
|
||||
Corresponding Source conveyed, and Installation Information provided,
|
||||
in accord with this section must be in a format that is publicly
|
||||
documented (and with an implementation available to the public in
|
||||
source code form), and must require no special password or key for
|
||||
unpacking, reading or copying.
|
||||
|
||||
7. Additional Terms.
|
||||
|
||||
"Additional permissions" are terms that supplement the terms of this
|
||||
License by making exceptions from one or more of its conditions.
|
||||
Additional permissions that are applicable to the entire Program shall
|
||||
be treated as though they were included in this License, to the extent
|
||||
that they are valid under applicable law. If additional permissions
|
||||
apply only to part of the Program, that part may be used separately
|
||||
under those permissions, but the entire Program remains governed by
|
||||
this License without regard to the additional permissions.
|
||||
|
||||
When you convey a copy of a covered work, you may at your option
|
||||
remove any additional permissions from that copy, or from any part of
|
||||
it. (Additional permissions may be written to require their own
|
||||
removal in certain cases when you modify the work.) You may place
|
||||
additional permissions on material, added by you to a covered work,
|
||||
for which you have or can give appropriate copyright permission.
|
||||
|
||||
Notwithstanding any other provision of this License, for material you
|
||||
add to a covered work, you may (if authorized by the copyright holders of
|
||||
that material) supplement the terms of this License with terms:
|
||||
|
||||
a) Disclaiming warranty or limiting liability differently from the
|
||||
terms of sections 15 and 16 of this License; or
|
||||
|
||||
b) Requiring preservation of specified reasonable legal notices or
|
||||
author attributions in that material or in the Appropriate Legal
|
||||
Notices displayed by works containing it; or
|
||||
|
||||
c) Prohibiting misrepresentation of the origin of that material, or
|
||||
requiring that modified versions of such material be marked in
|
||||
reasonable ways as different from the original version; or
|
||||
|
||||
d) Limiting the use for publicity purposes of names of licensors or
|
||||
authors of the material; or
|
||||
|
||||
e) Declining to grant rights under trademark law for use of some
|
||||
trade names, trademarks, or service marks; or
|
||||
|
||||
f) Requiring indemnification of licensors and authors of that
|
||||
material by anyone who conveys the material (or modified versions of
|
||||
it) with contractual assumptions of liability to the recipient, for
|
||||
any liability that these contractual assumptions directly impose on
|
||||
those licensors and authors.
|
||||
|
||||
All other non-permissive additional terms are considered "further
|
||||
restrictions" within the meaning of section 10. If the Program as you
|
||||
received it, or any part of it, contains a notice stating that it is
|
||||
governed by this License along with a term that is a further
|
||||
restriction, you may remove that term. If a license document contains
|
||||
a further restriction but permits relicensing or conveying under this
|
||||
License, you may add to a covered work material governed by the terms
|
||||
of that license document, provided that the further restriction does
|
||||
not survive such relicensing or conveying.
|
||||
|
||||
If you add terms to a covered work in accord with this section, you
|
||||
must place, in the relevant source files, a statement of the
|
||||
additional terms that apply to those files, or a notice indicating
|
||||
where to find the applicable terms.
|
||||
|
||||
Additional terms, permissive or non-permissive, may be stated in the
|
||||
form of a separately written license, or stated as exceptions;
|
||||
the above requirements apply either way.
|
||||
|
||||
8. Termination.
|
||||
|
||||
You may not propagate or modify a covered work except as expressly
|
||||
provided under this License. Any attempt otherwise to propagate or
|
||||
modify it is void, and will automatically terminate your rights under
|
||||
this License (including any patent licenses granted under the third
|
||||
paragraph of section 11).
|
||||
|
||||
However, if you cease all violation of this License, then your
|
||||
license from a particular copyright holder is reinstated (a)
|
||||
provisionally, unless and until the copyright holder explicitly and
|
||||
finally terminates your license, and (b) permanently, if the copyright
|
||||
holder fails to notify you of the violation by some reasonable means
|
||||
prior to 60 days after the cessation.
|
||||
|
||||
Moreover, your license from a particular copyright holder is
|
||||
reinstated permanently if the copyright holder notifies you of the
|
||||
violation by some reasonable means, this is the first time you have
|
||||
received notice of violation of this License (for any work) from that
|
||||
copyright holder, and you cure the violation prior to 30 days after
|
||||
your receipt of the notice.
|
||||
|
||||
Termination of your rights under this section does not terminate the
|
||||
licenses of parties who have received copies or rights from you under
|
||||
this License. If your rights have been terminated and not permanently
|
||||
reinstated, you do not qualify to receive new licenses for the same
|
||||
material under section 10.
|
||||
|
||||
9. Acceptance Not Required for Having Copies.
|
||||
|
||||
You are not required to accept this License in order to receive or
|
||||
run a copy of the Program. Ancillary propagation of a covered work
|
||||
occurring solely as a consequence of using peer-to-peer transmission
|
||||
to receive a copy likewise does not require acceptance. However,
|
||||
nothing other than this License grants you permission to propagate or
|
||||
modify any covered work. These actions infringe copyright if you do
|
||||
not accept this License. Therefore, by modifying or propagating a
|
||||
covered work, you indicate your acceptance of this License to do so.
|
||||
|
||||
10. Automatic Licensing of Downstream Recipients.
|
||||
|
||||
Each time you convey a covered work, the recipient automatically
|
||||
receives a license from the original licensors, to run, modify and
|
||||
propagate that work, subject to this License. You are not responsible
|
||||
for enforcing compliance by third parties with this License.
|
||||
|
||||
An "entity transaction" is a transaction transferring control of an
|
||||
organization, or substantially all assets of one, or subdividing an
|
||||
organization, or merging organizations. If propagation of a covered
|
||||
work results from an entity transaction, each party to that
|
||||
transaction who receives a copy of the work also receives whatever
|
||||
licenses to the work the party's predecessor in interest had or could
|
||||
give under the previous paragraph, plus a right to possession of the
|
||||
Corresponding Source of the work from the predecessor in interest, if
|
||||
the predecessor has it or can get it with reasonable efforts.
|
||||
|
||||
You may not impose any further restrictions on the exercise of the
|
||||
rights granted or affirmed under this License. For example, you may
|
||||
not impose a license fee, royalty, or other charge for exercise of
|
||||
rights granted under this License, and you may not initiate litigation
|
||||
(including a cross-claim or counterclaim in a lawsuit) alleging that
|
||||
any patent claim is infringed by making, using, selling, offering for
|
||||
sale, or importing the Program or any portion of it.
|
||||
|
||||
11. Patents.
|
||||
|
||||
A "contributor" is a copyright holder who authorizes use under this
|
||||
License of the Program or a work on which the Program is based. The
|
||||
work thus licensed is called the contributor's "contributor version".
|
||||
|
||||
A contributor's "essential patent claims" are all patent claims
|
||||
owned or controlled by the contributor, whether already acquired or
|
||||
hereafter acquired, that would be infringed by some manner, permitted
|
||||
by this License, of making, using, or selling its contributor version,
|
||||
but do not include claims that would be infringed only as a
|
||||
consequence of further modification of the contributor version. For
|
||||
purposes of this definition, "control" includes the right to grant
|
||||
patent sublicenses in a manner consistent with the requirements of
|
||||
this License.
|
||||
|
||||
Each contributor grants you a non-exclusive, worldwide, royalty-free
|
||||
patent license under the contributor's essential patent claims, to
|
||||
make, use, sell, offer for sale, import and otherwise run, modify and
|
||||
propagate the contents of its contributor version.
|
||||
|
||||
In the following three paragraphs, a "patent license" is any express
|
||||
agreement or commitment, however denominated, not to enforce a patent
|
||||
(such as an express permission to practice a patent or covenant not to
|
||||
sue for patent infringement). To "grant" such a patent license to a
|
||||
party means to make such an agreement or commitment not to enforce a
|
||||
patent against the party.
|
||||
|
||||
If you convey a covered work, knowingly relying on a patent license,
|
||||
and the Corresponding Source of the work is not available for anyone
|
||||
to copy, free of charge and under the terms of this License, through a
|
||||
publicly available network server or other readily accessible means,
|
||||
then you must either (1) cause the Corresponding Source to be so
|
||||
available, or (2) arrange to deprive yourself of the benefit of the
|
||||
patent license for this particular work, or (3) arrange, in a manner
|
||||
consistent with the requirements of this License, to extend the patent
|
||||
license to downstream recipients. "Knowingly relying" means you have
|
||||
actual knowledge that, but for the patent license, your conveying the
|
||||
covered work in a country, or your recipient's use of the covered work
|
||||
in a country, would infringe one or more identifiable patents in that
|
||||
country that you have reason to believe are valid.
|
||||
|
||||
If, pursuant to or in connection with a single transaction or
|
||||
arrangement, you convey, or propagate by procuring conveyance of, a
|
||||
covered work, and grant a patent license to some of the parties
|
||||
receiving the covered work authorizing them to use, propagate, modify
|
||||
or convey a specific copy of the covered work, then the patent license
|
||||
you grant is automatically extended to all recipients of the covered
|
||||
work and works based on it.
|
||||
|
||||
A patent license is "discriminatory" if it does not include within
|
||||
the scope of its coverage, prohibits the exercise of, or is
|
||||
conditioned on the non-exercise of one or more of the rights that are
|
||||
specifically granted under this License. You may not convey a covered
|
||||
work if you are a party to an arrangement with a third party that is
|
||||
in the business of distributing software, under which you make payment
|
||||
to the third party based on the extent of your activity of conveying
|
||||
the work, and under which the third party grants, to any of the
|
||||
parties who would receive the covered work from you, a discriminatory
|
||||
patent license (a) in connection with copies of the covered work
|
||||
conveyed by you (or copies made from those copies), or (b) primarily
|
||||
for and in connection with specific products or compilations that
|
||||
contain the covered work, unless you entered into that arrangement,
|
||||
or that patent license was granted, prior to 28 March 2007.
|
||||
|
||||
Nothing in this License shall be construed as excluding or limiting
|
||||
any implied license or other defenses to infringement that may
|
||||
otherwise be available to you under applicable patent law.
|
||||
|
||||
12. No Surrender of Others' Freedom.
|
||||
|
||||
If conditions are imposed on you (whether by court order, agreement or
|
||||
otherwise) that contradict the conditions of this License, they do not
|
||||
excuse you from the conditions of this License. If you cannot convey a
|
||||
covered work so as to satisfy simultaneously your obligations under this
|
||||
License and any other pertinent obligations, then as a consequence you may
|
||||
not convey it at all. For example, if you agree to terms that obligate you
|
||||
to collect a royalty for further conveying from those to whom you convey
|
||||
the Program, the only way you could satisfy both those terms and this
|
||||
License would be to refrain entirely from conveying the Program.
|
||||
|
||||
13. Use with the GNU Affero General Public License.
|
||||
|
||||
Notwithstanding any other provision of this License, you have
|
||||
permission to link or combine any covered work with a work licensed
|
||||
under version 3 of the GNU Affero General Public License into a single
|
||||
combined work, and to convey the resulting work. The terms of this
|
||||
License will continue to apply to the part which is the covered work,
|
||||
but the special requirements of the GNU Affero General Public License,
|
||||
section 13, concerning interaction through a network will apply to the
|
||||
combination as such.
|
||||
|
||||
14. Revised Versions of this License.
|
||||
|
||||
The Free Software Foundation may publish revised and/or new versions of
|
||||
the GNU General Public License from time to time. Such new versions will
|
||||
be similar in spirit to the present version, but may differ in detail to
|
||||
address new problems or concerns.
|
||||
|
||||
Each version is given a distinguishing version number. If the
|
||||
Program specifies that a certain numbered version of the GNU General
|
||||
Public License "or any later version" applies to it, you have the
|
||||
option of following the terms and conditions either of that numbered
|
||||
version or of any later version published by the Free Software
|
||||
Foundation. If the Program does not specify a version number of the
|
||||
GNU General Public License, you may choose any version ever published
|
||||
by the Free Software Foundation.
|
||||
|
||||
If the Program specifies that a proxy can decide which future
|
||||
versions of the GNU General Public License can be used, that proxy's
|
||||
public statement of acceptance of a version permanently authorizes you
|
||||
to choose that version for the Program.
|
||||
|
||||
Later license versions may give you additional or different
|
||||
permissions. However, no additional obligations are imposed on any
|
||||
author or copyright holder as a result of your choosing to follow a
|
||||
later version.
|
||||
|
||||
15. Disclaimer of Warranty.
|
||||
|
||||
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
|
||||
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
|
||||
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
|
||||
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
|
||||
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
|
||||
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
|
||||
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
|
||||
|
||||
16. Limitation of Liability.
|
||||
|
||||
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
|
||||
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
|
||||
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
|
||||
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
|
||||
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
|
||||
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
|
||||
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
|
||||
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
|
||||
SUCH DAMAGES.
|
||||
|
||||
17. Interpretation of Sections 15 and 16.
|
||||
|
||||
If the disclaimer of warranty and limitation of liability provided
|
||||
above cannot be given local legal effect according to their terms,
|
||||
reviewing courts shall apply local law that most closely approximates
|
||||
an absolute waiver of all civil liability in connection with the
|
||||
Program, unless a warranty or assumption of liability accompanies a
|
||||
copy of the Program in return for a fee.
|
||||
|
||||
END OF TERMS AND CONDITIONS
|
||||
|
||||
How to Apply These Terms to Your New Programs
|
||||
|
||||
If you develop a new program, and you want it to be of the greatest
|
||||
possible use to the public, the best way to achieve this is to make it
|
||||
free software which everyone can redistribute and change under these terms.
|
||||
|
||||
To do so, attach the following notices to the program. It is safest
|
||||
to attach them to the start of each source file to most effectively
|
||||
state the exclusion of warranty; and each file should have at least
|
||||
the "copyright" line and a pointer to where the full notice is found.
|
||||
|
||||
<one line to give the program's name and a brief idea of what it does.>
|
||||
Copyright (C) <year> <name of author>
|
||||
|
||||
This program is free software: you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation, either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
Also add information on how to contact you by electronic and paper mail.
|
||||
|
||||
If the program does terminal interaction, make it output a short
|
||||
notice like this when it starts in an interactive mode:
|
||||
|
||||
<program> Copyright (C) <year> <name of author>
|
||||
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
|
||||
This is free software, and you are welcome to redistribute it
|
||||
under certain conditions; type `show c' for details.
|
||||
|
||||
The hypothetical commands `show w' and `show c' should show the appropriate
|
||||
parts of the General Public License. Of course, your program's commands
|
||||
might be different; for a GUI interface, you would use an "about box".
|
||||
|
||||
You should also get your employer (if you work as a programmer) or school,
|
||||
if any, to sign a "copyright disclaimer" for the program, if necessary.
|
||||
For more information on this, and how to apply and follow the GNU GPL, see
|
||||
<http://www.gnu.org/licenses/>.
|
||||
|
||||
The GNU General Public License does not permit incorporating your program
|
||||
into proprietary programs. If your program is a subroutine library, you
|
||||
may consider it more useful to permit linking proprietary applications with
|
||||
the library. If this is what you want to do, use the GNU Lesser General
|
||||
Public License instead of this License. But first, please read
|
||||
<http://www.gnu.org/philosophy/why-not-lgpl.html>.
|
Loading…
Reference in New Issue