1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
; "eval.scm", Eval proposed by Guillermo (Bill) J. Rozas for R5RS.
; Copyright (c) 1997, 1998 Aubrey Jaffer
;
;Permission to copy this software, to modify it, to redistribute it,
;to distribute modified versions, and to use it for any purpose is
;granted, subject to the following restrictions and understandings.
;
;1. Any copy made of this software must include this copyright notice
;in full.
;
;2. I have made no warranty or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;
;3. In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.
;;; Rather than worry over the status of all the optional procedures,
;;; just require as many as possible.
(require 'rev4-optional-procedures)
(require 'dynamic-wind)
(require 'transcript)
(require 'with-file)
(require 'values)
(define eval:make-environment
(let ((eval-1 slib:eval))
(lambda (identifiers)
((lambda args args)
#f
identifiers
(lambda (expression)
(eval-1 `(lambda ,identifiers ,expression)))))))
(define eval:capture-environment!
(let ((set-car! set-car!)
(eval-1 slib:eval)
(apply apply))
(lambda (environment)
(set-car!
environment
(apply (lambda (environment-values identifiers procedure)
(eval-1 `((lambda args args) ,@identifiers)))
environment)))))
;@
(define interaction-environment
(let ((env (eval:make-environment '())))
(lambda () env)))
;;;@ null-environment is set by first call to scheme-report-environment at
;;; the end of this file.
(define null-environment #f)
;@
(define scheme-report-environment
(let* ((r4rs-procedures
(append
(cond ((provided? 'inexact)
(append
'(acos angle asin atan cos exact->inexact exp
expt imag-part inexact->exact log magnitude
make-polar make-rectangular real-part sin
sqrt tan)
(if (let ((n (string->number "1/3")))
(and (number? n) (exact? n)))
'(denominator numerator)
'())))
(else '()))
(cond ((provided? 'rationalize)
'(rationalize))
(else '()))
(cond ((provided? 'delay)
'(force))
(else '()))
(cond ((provided? 'char-ready?)
'(char-ready?))
(else '()))
'(* + - / < <= = > >= abs append apply assoc assq assv boolean?
caaaar caaadr caaar caadar caaddr caadr caar cadaar cadadr cadar
caddar cadddr caddr cadr call-with-current-continuation
call-with-input-file call-with-output-file car cdaaar cdaadr
cdaar cdadar cdaddr cdadr cdar cddaar cddadr cddar cdddar cddddr
cdddr cddr cdr ceiling char->integer char-alphabetic? char-ci<=?
char-ci<? char-ci=? char-ci>=? char-ci>? char-downcase
char-lower-case? char-numeric? char-upcase char-upper-case?
char-whitespace? char<=? char<? char=? char>=? char>? char?
close-input-port close-output-port complex? cons
current-input-port current-output-port display eof-object? eq?
equal? eqv? even? exact? floor for-each gcd inexact?
input-port? integer->char integer? lcm length list list->string
list->vector list-ref list-tail list? load make-string
make-vector map max member memq memv min modulo negative?
newline not null? number->string number? odd? open-input-file
open-output-file output-port? pair? peek-char positive?
procedure? quotient rational? read read-char real? remainder
reverse round set-car! set-cdr! string string->list
string->number string->symbol string-append string-ci<=?
string-ci<? string-ci=? string-ci>=? string-ci>? string-copy
string-fill! string-length string-ref string-set! string<=?
string<? string=? string>=? string>? string? substring
symbol->string symbol? transcript-off transcript-on truncate
vector vector->list vector-fill! vector-length vector-ref
vector-set! vector? with-input-from-file with-output-to-file
write write-char zero?
)))
(r5rs-procedures
(append
'(call-with-values dynamic-wind eval interaction-environment
null-environment scheme-report-environment values)
r4rs-procedures))
(r4rs-environment (eval:make-environment r4rs-procedures))
(r5rs-environment (eval:make-environment r5rs-procedures)))
(let ((car car))
(lambda (version)
(cond ((car r5rs-environment))
(else
(let ((null-env (eval:make-environment r5rs-procedures)))
(set-car! null-env (map (lambda (i) #f) r5rs-procedures))
(set! null-environment (lambda version null-env)))
(eval:capture-environment! r4rs-environment)
(eval:capture-environment! r5rs-environment)))
(case version
((4) r4rs-environment)
((5) r5rs-environment)
(else (slib:error 'eval 'version version 'not 'available)))))))
;@
(define eval
(let ((eval-1 slib:eval)
(apply apply)
(null? null?)
(eq? eq?))
(lambda (expression . environment)
(if (null? environment) (eval-1 expression)
(apply
(lambda (environment)
(if (eq? (interaction-environment) environment) (eval-1 expression)
(apply (lambda (environment-values identifiers procedure)
(apply (procedure expression) environment-values))
environment)))
environment)))))
(set! slib:eval eval)
;;; Now that all the R5RS procedures are defined, capture r5rs-environment.
(and (scheme-report-environment 5) #t)
|