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
|
;"scmacro.scm", port for Syntactic Closures macro implementation -*- Scheme -*-
;Copyright (C) 1992, 1993, 1994 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.
(require 'promise) ; Portable support for force and delay.
(require 'record)
(require 'synchk) ; Syntax checker.
;;;; Syntaxer Output Interface
(define syntax-error slib:error)
(define impl-error slib:error)
(define (append-map procedure . lists)
(apply append (apply map (cons procedure lists))))
(define *counter* 0)
(define (make-name-generator)
(let ((suffix-promise
(make-promise
(lambda ()
(string-append "."
(number->string (begin
(set! *counter* (+ *counter* 1))
*counter*)))))))
(lambda (identifier)
(string->symbol
(string-append "."
(symbol->string (identifier->symbol identifier))
(force suffix-promise))))))
(define (output/variable name)
name)
(define (output/literal-unquoted datum)
datum)
(define (output/literal-quoted datum);was output/constant (inefficient)
`(QUOTE ,datum))
(define (output/assignment name value)
`(SET! ,name ,value))
(define (output/top-level-definition name value)
`(DEFINE ,name ,value))
(define (output/conditional predicate consequent alternative)
`(IF ,predicate ,consequent ,alternative))
(define (output/sequence expressions)
(if (null? (cdr expressions))
(car expressions)
`(BEGIN ,@expressions)))
(define (output/combination operator operands)
`(,operator ,@operands))
(define (output/lambda pattern body)
`(LAMBDA ,pattern ,body))
(define (output/delay expression)
`(DELAY ,expression))
(define (output/unassigned)
`'*UNASSIGNED*)
(define (output/unspecific)
`'*UNSPECIFIC*)
;;; This file is the macro expander proper.
(slib:load (in-vicinity (library-vicinity) "synclo"))
;;; These files define the R4RS syntactic environment.
(slib:load (in-vicinity (library-vicinity) "r4rsyn"))
(slib:load (in-vicinity (library-vicinity) "synrul"))
;;; OK, time to build the databases.
(initialize-scheme-syntactic-environment!)
;;@ MACRO:EXPAND is for you to use. It takes an R4RS expression, macro-expands
;;; it, and returns the result of the macro expansion.
(define (synclo:expand expression)
(set! *counter* 0)
(compile/top-level (list expression) scheme-syntactic-environment))
(define macro:expand synclo:expand)
;;; Here are EVAL, EVAL! and LOAD which expand macros. You can replace the
;;; implementation's eval and load with them if you like.
(define base:eval slib:eval)
;;(define base:load load)
;@
(define (synclo:eval x) (base:eval (macro:expand x)))
(define macro:eval synclo:eval)
;@
(define (synclo:load <pathname>)
(slib:eval-load <pathname> synclo:eval))
(define macro:load synclo:load)
(provide 'syntactic-closures)
(provide 'macro) ;Here because we may have
;(require 'sc-macro)
|
