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292 lines
8.4 KiB
Scheme
292 lines
8.4 KiB
Scheme
;;; compat.ss
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;;; Copyright 1984-2017 Cisco Systems, Inc.
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;;;
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;;; Licensed under the Apache License, Version 2.0 (the "License");
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;;; you may not use this file except in compliance with the License.
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;;; You may obtain a copy of the License at
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;;;
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;;; http://www.apache.org/licenses/LICENSE-2.0
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;;;
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;;; Unless required by applicable law or agreed to in writing, software
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;;; distributed under the License is distributed on an "AS IS" BASIS,
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;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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;;; See the License for the specific language governing permissions and
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;;; limitations under the License.
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;;; miscellaneous definitions to make this version compatible
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;;; (where possible) with previous versions...and to a small extent with
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;;; other versions of scheme and other dialects of lisp as well
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;;; use only those items that you need to avoid introducing accidental
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;;; dependencies on other items.
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(define-syntax define!
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(syntax-rules ()
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((_ x v) (begin (set! x v) 'x))))
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(define-syntax defrec!
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(syntax-rules ()
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((_ x v) (define! x (rec x v)))))
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(define-syntax begin0
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(syntax-rules ()
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((_ x y ...) (let ((t x)) y ... t))))
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(define-syntax recur
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(syntax-rules ()
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((_ f ((i v) ...) e1 e2 ...)
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(let f ((i v) ...) e1 e2 ...))))
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(define-syntax trace-recur
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(syntax-rules ()
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((_ f ((x v) ...) e1 e2 ...)
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(trace-let f ((x v) ...) e1 e2 ...))))
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(define swap-box!
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(lambda (b v)
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(if (box? b)
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(let ((x (unbox b))) (set-box! b v) x)
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(error 'swap-box! "~s is not a box" b))))
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(define cull
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(lambda (pred? ls)
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(unless (procedure? pred?)
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(error 'cull "~s is not a procedure" pred?))
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(let f ([l ls])
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(cond
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[(pair? l)
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(if (pred? (car l))
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(cons (car l) (f (cdr l)))
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(f (cdr l)))]
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[(null? l) '()]
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[else (error 'cull "~s is not a proper list" ls)]))))
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(define cull! cull)
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(define mem
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(lambda (pred? ls)
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(unless (procedure? pred?)
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(error 'mem "~s is not a procedure" pred?))
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(let f ([l ls])
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(cond
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[(pair? l) (if (pred? (car l)) l (f (cdr l)))]
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[(null? l) #f]
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[else (error 'mem "~s is not a proper list" ls)]))))
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(define rem
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(lambda (pred? ls)
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(unless (procedure? pred?)
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(error 'rem "~s is not a procedure" pred?))
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(let f ([l ls])
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(cond
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[(pair? l)
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(if (pred? (car l))
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(f (cdr l))
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(cons (car l) (f (cdr l))))]
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[(null? l) '()]
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[else (error 'rem "~s is not a proper list" ls)]))))
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(define rem!
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(lambda (pred? ls)
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(unless (procedure? pred?)
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(error 'rem! "~s is not a procedure" pred?))
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(let f ([l ls])
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(cond
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[(pair? l)
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(if (pred? (car l))
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(f (cdr l))
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(begin
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(set-cdr! l (f (cdr l)))
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l))]
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[(null? l) '()]
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[else (error 'rem! "~s is not a proper list" ls)]))))
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(define ass
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(lambda (pred? alist)
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(unless (procedure? pred?)
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(error 'ass "~s is not a procedure" pred?))
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(let loop ([l alist])
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(cond
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[(and (pair? l) (pair? (car l)))
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(if (pred? (caar l))
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(car l)
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(loop (cdr l)))]
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[(null? l) #f]
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[else (error 'ass "improperly formed alist ~s" alist)]))))
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(define prompt-read
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(lambda (fmt . args)
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(apply printf fmt args)
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(read)))
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(define tree-copy
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(rec tree-copy
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(lambda (x)
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(if (pair? x)
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(cons (tree-copy (car x)) (tree-copy (cdr x)))
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x))))
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(define ferror error)
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(define *most-negative-short-integer* (most-negative-fixnum))
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(define *most-positive-short-integer* (most-positive-fixnum))
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(define *most-negative-fixnum* (most-negative-fixnum))
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(define *most-positive-fixnum* (most-positive-fixnum))
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(define *eof* (read-char (open-input-string "")))
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(define short-integer? fixnum?)
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(define big-integer? bignum?)
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(define ratio? ratnum?)
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(define float? flonum?)
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(define bound? top-level-bound?)
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(define global-value top-level-value)
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(define set-global-value! set-top-level-value!)
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(define define-global-value define-top-level-value)
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(define symbol-value top-level-value)
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(define set-symbol-value! set-top-level-value!)
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(define put putprop)
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(define get getprop)
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(define copy-list list-copy)
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(define copy-tree tree-copy)
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(define copy-string string-copy)
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(define copy-vector vector-copy)
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(define intern string->symbol)
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(define symbol-name symbol->string)
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(define string->uninterned-symbol gensym)
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(define make-temp-symbol string->uninterned-symbol)
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(define uninterned-symbol? gensym?)
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(define temp-symbol? uninterned-symbol?)
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(define compile-eval compile)
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(define closure? procedure?)
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(define =? =)
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(define <? <)
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(define >? >)
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(define <=? <=)
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(define >=? >=)
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(define float exact->inexact)
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(define rational inexact->exact)
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(define char-equal? char=?)
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(define char-less? char<?)
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(define string-equal? string=?)
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(define string-less? string<?)
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; following defn conflicts with new r6rs mod
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#;(define mod modulo)
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(define flush-output flush-output-port)
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(define clear-output clear-output-port)
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(define clear-input clear-input-port)
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(define mapcar map)
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(define mapc for-each)
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(define true #t)
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(define false #f)
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(define t #t)
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(define nil '())
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(define macro-expand expand)
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;;; old macro and structure definition
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;;; thanks to Michael Lenaghan (MichaelL@frogware.com) for suggesting
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;;; various improvements.
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(define-syntax define-macro!
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(lambda (x)
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(syntax-case x ()
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[(k (name arg1 ... . args)
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form1
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form2
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...)
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#'(k name (arg1 ... . args)
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form1
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form2
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...)]
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[(k (name arg1 arg2 ...)
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form1
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form2
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...)
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#'(k name (arg1 arg2 ...)
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form1
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form2
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...)]
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[(k name args . forms)
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(identifier? #'name)
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(letrec ((add-car
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(lambda (access)
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(case (car access)
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((cdr) `(cadr ,@(cdr access)))
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((cadr) `(caadr ,@(cdr access)))
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((cddr) `(caddr ,@(cdr access)))
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((cdddr) `(cadddr ,@(cdr access)))
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(else `(car ,access)))))
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(add-cdr
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(lambda (access)
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(case (car access)
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((cdr) `(cddr ,@(cdr access)))
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((cadr) `(cdadr ,@(cdr access)))
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((cddr) `(cdddr ,@(cdr access)))
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((cdddr) `(cddddr ,@(cdr access)))
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(else `(cdr ,access)))))
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(parse
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(lambda (l access)
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(cond
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((null? l) '())
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((symbol? l) `((,l ,access)))
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((pair? l)
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(append!
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(parse (car l) (add-car access))
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(parse (cdr l) (add-cdr access))))
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(else
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(syntax-error #'args
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(format "invalid ~s parameter syntax" (datum k))))))))
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(with-syntax ((proc (datum->syntax-object #'k
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(let ((g (gensym)))
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`(lambda (,g)
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(let ,(parse (datum args) `(cdr ,g))
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,@(datum forms)))))))
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#'(define-syntax name
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(lambda (x)
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(syntax-case x ()
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((k1 . r)
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(datum->syntax-object #'k1
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(proc (syntax-object->datum x)))))))))])))
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(alias define-macro define-macro!)
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(alias defmacro define-macro!)
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(define-macro! define-struct! (name . slots)
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`(begin
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(define ,name
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(lambda ,slots
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(vector ',name ,@slots)))
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(define ,(string->symbol (format "~a?" name))
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(lambda (x)
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(and (vector? x)
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(= (vector-length x) (1+ ,(length slots)))
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(eq? ',name (vector-ref x 0)))))
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,@(\#make-accessors name slots)
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',name))
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(define \#make-accessors
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(lambda (name slots)
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(recur f ((n 1) (slots slots))
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(if (not (null? slots))
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(let*
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((afn (string->symbol (format "~a-~a" name (car slots))))
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(sfn (string->symbol (format "~a!" afn))))
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`((define-macro! ,afn (x) `(vector-ref ,x ,,n))
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(define-macro! ,sfn (x v) `(vector-set! ,x ,,n ,v))
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,@(f (1+ n) (cdr slots))))
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'()))))
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