126 lines
3.2 KiB
Scheme
126 lines
3.2 KiB
Scheme
;;; Ported from Scheme 48 1.9. See file COPYING for notices and license.
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;;;
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;;; Port Author: Andrew Whatson
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;;;
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;;; Original Authors: Richard Kelsey, Jonathan Rees, Mike Sperber, Robert Ransom
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;;;
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;;; scheme48-1.9.2/scheme/big/big-util.scm
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;;; scheme48-1.9.2/scheme/rts/exception.scm
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(define-module (prescheme scheme48)
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#:use-module (srfi srfi-8)
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#:use-module (srfi srfi-60)
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#:use-module (rnrs bytevectors)
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#:use-module (rnrs io ports)
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#:use-module (prescheme s48-defenum)
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#:export (arithmetic-shift
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ascii->char
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char->ascii
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unspecific
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make-code-vector
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code-vector-ref
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code-vector-set!
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code-vector-length
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make-table
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table-ref
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table-set!
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table-walk
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byte-ready?
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peek-byte
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read-byte
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write-byte
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assertion-violation
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concatenate-symbol
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atom?
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neq?
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n=
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memq?
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null-list?
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every?
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partition-list)
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#:re-export (define-enumeration
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enum
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name->enumerand
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enumerand->name
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bitwise-and
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bitwise-ior
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bitwise-xor
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bitwise-not
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receive))
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(define arithmetic-shift ash)
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(define ascii->char integer->char)
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(define char->ascii char->integer)
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(define unspecific (if #f #f))
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(define make-code-vector make-bytevector)
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(define code-vector-ref bytevector-u8-ref)
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(define code-vector-set! bytevector-u8-set!)
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(define code-vector-length bytevector-length)
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(define make-table make-hash-table)
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(define table-ref hash-ref)
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(define table-set! hash-set!)
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(define table-walk hash-for-each)
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(define byte-ready? char-ready?)
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(define peek-byte lookahead-u8)
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(define read-byte get-u8)
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(define write-byte put-u8)
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(define (assertion-violation who message . irritants)
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(apply error message irritants))
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(define (concatenate-symbol . stuff)
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(string->symbol
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(apply string-append
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(map (lambda (x)
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(cond ((string? x) x)
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((symbol? x) (symbol->string x))
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((number? x) (number->string x))
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(else
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(assertion-violation 'concatenate-symbol "cannot coerce to a string"
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x))))
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stuff))))
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(define (atom? x)
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(not (pair? x)))
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(define (neq? a b)
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(not (eq? a b)))
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(define (n= x y)
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(not (= x y)))
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(define (memq? x l)
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(let loop ((l l))
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(cond ((null? l) #f)
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((eq? x (car l)) #t)
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(else (loop (cdr l))))))
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(define (null-list? x)
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(cond ((null? x) #t)
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((pair? x) #f)
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(else
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(assertion-violation 'null-list? "non-list" x))))
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(define (every? pred list)
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(let loop ((list list))
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(cond ((null? list)
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#t)
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((pred (car list))
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(loop (cdr list)))
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(else
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#f))))
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(define (partition-list pred l)
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(let loop ((l l) (yes '()) (no '()))
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(cond ((null? l)
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(values (reverse yes) (reverse no)))
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((pred (car l))
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(loop (cdr l) (cons (car l) yes) no))
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(else
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(loop (cdr l) yes (cons (car l) no))))))
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