/usr/share/racket/pkgs/frtime/frp-snip.rkt is in racket-common 6.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | #lang racket/base
(require racket/class
racket/list
racket/port
framework
;; FRP requires
frtime/core/frp
(except-in frtime/lang-ext
undefined?)
(only-in frtime/lang-core
any-nested-reactivity? raise-reactivity)
;; GRacket require
mred)
(define drs-eventspace #f)
(define (set-eventspace evspc)
(set! drs-eventspace evspc))
(define value-snip-copy%
(class string-snip%
(init-field current parent)
(inherit get-admin)
(define/public (set-current c)
(parameterize ([current-eventspace drs-eventspace])
(queue-callback
(lambda ()
(set! current c)
(let ([admin (get-admin)])
(when admin
(send admin needs-update this 0 0 2000 100)))))))
(define/override (draw dc x y left top right bottom dx dy draw-caret)
(send current draw dc x y left top right bottom dx dy draw-caret))
(super-instantiate (" "))))
(define make-snip
(case-lambda
[(bhvr)
(make-object string-snip%
(let ([tmp (cond
[(behavior? bhvr) (value-now bhvr)]
[(event? bhvr) (signal-value bhvr)]
[else bhvr])])
(cond
[(event-set? tmp) (format "#<event (last: ~a@~a)>"
(event-set-events tmp) (event-set-time tmp))]
[(undefined? tmp) "<undefined>"]
[else (format "~a" tmp)])))]
[(bhvr super-render-fun)
(get-rendering (value-now bhvr) super-render-fun)]))
(define value-snip%
(class string-snip%
(init-field bhvr)
(field [copies empty]
[loc-bhvr (proc->signal (lambda () (update)) bhvr)]
[current (make-snip bhvr)])
(define/override (copy)
(let ([ret (make-object value-snip-copy% current this)])
(set! copies (cons ret copies))
ret))
(define/public (update)
(set! current (make-snip bhvr))
(for-each (lambda (copy) (send copy set-current current)) copies))
(super-instantiate (" "))))
(define dynamic-snip-copy%
(class editor-snip%
(init-field current parent)
(inherit get-editor)
(define/public (set-current c)
(parameterize ([current-eventspace drs-eventspace])
(queue-callback
(lambda ()
(send (get-editor) lock #f)
(send (get-editor) delete 0 (send (get-editor) last-position))
(for-each (lambda (thing)
(send (get-editor) insert thing
(send (get-editor) last-position) (send (get-editor) last-position)))
c)
(send (get-editor) lock #t)))))
(super-new
[editor (new racket:text%)]
[with-border? #f]
[left-margin 0]
[right-margin 0]
[top-margin 0]
[bottom-margin 0])
(set-current current)))
(define dynamic-snip%
(class snip%
(init-field bhvr super-render-fun)
(field [copies empty]
[loc-bhvr (proc->signal (lambda () (update)) bhvr)]
[current (make-snip bhvr super-render-fun)])
(define/override (copy)
(let ([ret (make-object dynamic-snip-copy% current this)])
(set! copies (cons ret copies))
ret))
(define/public (update)
(set! current (make-snip bhvr super-render-fun))
(for-each (lambda (copy) (send copy set-current current)) copies))
(define/override (size-cache-invalid)
(for-each
(lambda (s) (send s size-cache-invalid))
copies))
(define/override (get-extent dc x y w h descent space lspace rspace)
(send current get-extent dc x y w h descent space lspace rspace))
(super-new)))
(define (render beh as-snip?)
(cond
[as-snip? (watch beh)]
[(undefined? (value-now beh)) "<undefined>"]
[(behavior? beh) (format "#<behavior (~a)>" (value-now beh))]
[(event? beh) (format "#<event (last: ~a)>" (event-set-events (signal-value beh)))]
[else beh]))
(define (render/dynamic-snip val super-render-fun)
(if (behavior? val)
; interesting case:
; create a snip
; each time val changes, recompute its rendering via super-render-fun
(make-object dynamic-snip% val super-render-fun)
; easy case
(super-render-fun val)))
(define (get-rendering val super-render-fun)
(let-values ([(in out) (make-pipe-with-specials)])
(thread (lambda () (super-render-fun val out) (close-output-port out)))
(let loop ([chars empty])
(let ([c (read-char-or-special in)])
(if (eof-object? c)
(reverse (rest chars))
(loop (cons c chars)))))))
(define (watch beh super-render-fun)
(cond
[(undefined? beh)
(begin
(make-object string-snip% "<undefined>")
)
]
[(event? beh)
(make-object value-snip% beh)]
[(or (behavior? beh) (any-nested-reactivity? beh))
(make-object dynamic-snip% (raise-reactivity beh) super-render-fun)]
[(signal? beh)
(make-object dynamic-snip% beh super-render-fun)]
[else beh]))
(provide (all-defined-out))
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