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
|
(defun sys:extract-keys (keys args)
(build
(each ((k keys))
(iflet ((f (memp (car k) args)))
(add (cadr f))
(add (cdr k))))))
(defun sys:extract-keys-p (keys args)
(build
(each ((k keys))
(add (if (memp k args) t)))))
(defun sys:build-key-list-expr (key-params menv)
(let ((exprs (collect-each ((kp key-params))
(let ((kw (intern (symbol-name (first kp)) 'keyword))
(ex (second kp)))
(if (constantp ex menv)
^(quote (,kw . ,(second kp)))
^(cons ,kw ,(second kp)))))))
(if [all exprs (op eq 'quote) car]
^(quote ,[mapcar cadr exprs])
^(list ,*exprs))))
(define-param-expander :key (param body menv form)
(let* ((excluding-rest (butlastn 0 param))
(key-start (memq '-- excluding-rest))
(rest-param (or (nthlast 0 param) (gensym)))
(before-key (ldiff excluding-rest key-start))
(key-params-raw (butlastn 0 (cdr key-start)))
(key-params [mapcar [iffi atom (op list @1)] key-params-raw])
(eff-param (append before-key rest-param)))
(each ((key-spec key-params))
(tree-case key-spec
((sym init var-p . junk)
(when (consp junk)
(compile-error form "superfluous forms in ~s" key-spec))
(when junk
(compile-error form "invalid dotted form ~s" key-spec))
(unless (bindable var-p)
(compile-error form "~s isn't a bindable symbol" var-p))
:)
((sym init . more)
(unless (listp more)
(compile-error form "invalid dotted form ~s" key-spec))
:)
((sym . more)
(unless (listp more)
(compile-error form "invalid dotted form ~s" key-spec))
(unless (bindable sym)
(compile-error form "~s isn't a bindable symbol" sym)))))
(let* ((key-params-p [keep-if third key-params])
(key-vars [mapcar first key-params])
(key-vars-p [mapcar third key-params-p])
(keys (sys:build-key-list-expr key-params menv))
(keys-p (mapcar (op intern (symbol-name (first @1)) 'keyword)
key-params-p)))
(list eff-param
^(tree-bind ,key-vars
(sys:extract-keys ,keys ,rest-param)
,*(if keys-p
^((tree-bind ,key-vars-p
(sys:extract-keys-p ',keys-p ,rest-param)
,*body))
body))))))
|