18 ('closure 'closure) ; only available in codegen
19 ('static-string 'static-string) ; only available in codegen
21 ((builtin? x) 'builtin)
23 ((integer? x) 'int-literal)
24 ((boolean? x) 'bool-literal)
25 ((string? x) 'string-literal)))
27 (define (ast-traverse f x)
29 ('let `(let ,(map (lambda (x) (list (car x) (f (cadr x))))
31 ,@(map f (let-body x))))
33 ('lambda `(lambda ,(lambda-args x) ,(f (lambda-body x))))
34 ('if `(if ,@(map f (cdr x))))
37 (define (ast-collect f x)
38 (define (inner y) (ast-collect f y))
41 (flat-map inner (let-bindings x))
42 (flat-map inner (let-body x)))]
45 ['lambda (append (f x)
46 (inner (lambda-body x)))]
48 (flat-map inner (cdr x)))]
51 (define (ast-find p x)
52 (define (inner y) (ast-find p y))
53 (define (any p x) (fold-left
54 (lambda (acc y) (if acc #t (p y)))
60 (apply either (cdr fs)))))
64 (any inner (let-bindings x))
65 (any inner (let-body x)))]
68 ['lambda (either (p x)
69 (inner (lambda-body x)))]
70 ['if (either (p x) (any inner (cdr x)))]
73 (define (let-bindings e)
74 (define (pattern-match x body)
75 (if (eqv? (ast-type x) 'var)
77 (let* ([constructor (car x)]
78 [destructor (lambda (i) `(destruct ,i ,constructor))])
79 (flat-map (lambda (y i)
80 (pattern-match y (list (destructor i) body)))
82 (range 0 (length (cdr x)))))))
83 (flat-map (lambda (x) (pattern-match (car x) (cdr x))) (cadr e)))
84 (define let-body cddr)
87 (and (list? x) (eq? (car x) 'lambda)))
90 (define (statement-type x)
93 (eqv? (car x) 'data)) 'data]
95 (eqv? (car x) 'define)) 'define]
98 (define (program-datas program)
99 (filter (lambda (x) (eqv? (statement-type x) 'data))
102 (define (program-defines program)
103 (filter (lambda (x) (eqv? (statement-type x) 'defines))
106 (define (program-body program)
108 ,@(filter (lambda (x) (eqv? (statement-type x) 'expr))
111 ; for use in normalized form
112 (define lambda-arg caadr)
114 (define lambda-args cadr)
115 (define lambda-body caddr)
120 (append (range s (- n 1))
121 (list (+ s (- n 1))))))
123 (define (flat-map f . xs) (fold-left append '() (map f xs)))
124 (define (repeat x n) (if (<= n 0) '()
125 (cons x (repeat x (- n 1)))))
130 ((_ s x) (set! s (cons x s)))))
134 ((_ s) (let ([x (car s)])