blob: 50688a30f79ce35585f27baeafcd8ea1a96b9fa7 (
plain)
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
|
(%defmacro %defun args
(list '%fset
(list 'quote (car (cdr (car args))))
(cons '%lambda (cdr (cdr (car args))))))
(%defun list* args
(if (null (cdr args))
(car args)
(cons (car args)
(apply 'list* (cdr args)))))
(%defmacro let* args
(let ((form (car args)))
(let ((bindings (car (cdr form)))
(body (cdr (cdr form))))
(if (null bindings)
(list* 'let nil body)
(let ((first-binding (car bindings))
(rest (cdr bindings)))
(list 'let
(list first-binding)
(list* 'let* rest body)))))))
(%defmacro cond args
(let* ((form (car args))
(clauses (cdr form))
(clause (car clauses))
(rest (cdr clauses)))
(if (null clauses)
nil
(list 'if
(car clause)
(cons 'progn (cdr clause))
(cons 'cond rest)))))
(%defun not args
(if (null (car args)) t nil))
(%defun make-%defmacro*-body args
(let ((lambda-list (car args))
(lambda-list-name (car (cdr args)))
(body (car (cdr (cdr args)))))
(cond ((null lambda-list) body)
((not (listp lambda-list))
(list
(list* 'let
(list (list lambda-list lambda-list-name))
body)))
(t (let ((lambda-symbol (car lambda-list))
(rest-lambda-list (cdr lambda-list))
(rest-name (gensym)))
(list
(list* 'let
(list (list lambda-symbol
(list 'car lambda-list-name))
(list rest-name
(list 'cdr lambda-list-name)))
(make-%defmacro*-body (cdr lambda-list)
rest-name
body))))))))
(%defmacro %defmacro* args
(let* ((form (car args))
(real-args (cdr form)))
(let ((name (car real-args))
(lambda-list (car (cdr real-args)))
(body (cdr (cdr real-args)))
(macro-lambda-list-name (gensym))
(lambda-list-name (gensym)))
(list '%defmacro
name
macro-lambda-list-name
(list* 'let
(list (list lambda-list-name
(list 'cdr
(list 'car macro-lambda-list-name))))
(make-%defmacro*-body lambda-list lambda-list-name body))))))
(%defmacro %defun* args
(let* ((form (car args))
(real-args (cdr form)))
(let ((name (car real-args))
(lambda-list (car (cdr real-args)))
(body (cdr (cdr real-args)))
(lambda-list-name (gensym)))
(list* '%defun
name
lambda-list-name
(make-%defmacro*-body lambda-list lambda-list-name body)))))
(%defmacro* and expressions
(cond ((null expressions) t)
((null (cdr expressions)) (car expressions))
(t (list 'if
(car expressions)
(cons 'and (cdr expressions))
nil))))
(%defmacro* or expressions
(cond ((null expressions) nil)
((null (cdr expressions)) (car expressions))
(t (let ((expr-sym (gensym)))
(list 'let
(list (list expr-sym (car expressions)))
(list 'if
expr-sym
expr-sym
(cons 'or (cdr expressions))))))))
(%defun* %member (item list)
(and list
(or (and (eq item (car list)) list)
(%member item (cdr list)))))
(%defmacro* case (object . clauses)
(let ((this-clause (car clauses))
(rest (cdr clauses))
(object-sym (gensym)))
(if (null clauses)
nil
(if (and (null rest)
(or (eq (car this-clause) t)
(eq (car this-clause) 'otherwise)))
(cons 'progn (cdr this-clause))
(list 'let
(list (list object-sym object))
(list 'if
(if (listp (car this-clause))
(list '%member
object-sym
(list 'quote (car this-clause)))
(list 'eq
object-sym
(list 'quote (car this-clause))))
(cons 'progn (cdr this-clause))
(list* 'case object-sym rest)))))))
|
