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#lang debug racket/base
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(require racket/struct racket/format racket/list racket/string racket/promise racket/dict racket/match)
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(provide (all-defined-out))
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(module+ test (require rackunit))
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(define (size q)
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(match (quad-size q)
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[(? procedure? proc) (proc q)]
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[(? promise? prom) (force prom)]
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[val val]))
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(define (printable? q [signal #f])
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(match (quad-printable q)
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[(? procedure? proc) (proc q signal)]
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[val val]))
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(define (draw q [surface (current-output-port)])
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((quad-draw-start q) q surface)
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((quad-draw q) q surface)
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((quad-draw-end q) q surface))
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(define (hashes-equal? h1 h2)
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(and (= (length (hash-keys h1)) (length (hash-keys h2)))
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(for/and ([(k v) (in-hash h1)])
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(and (hash-has-key? h2 k) (equal? (hash-ref h2 k) v)))))
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(define (quad=? q1 q2 recur?)
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(and
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;; exclude attrs from initial comparison
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(for/and ([getter (in-list (list quad-elems quad-size quad-in quad-out quad-inner
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quad-offset quad-origin quad-printable
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quad-draw-start quad-draw-end quad-draw))])
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(equal? (getter q1) (getter q2)))
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;; and compare them key-by-key
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(hashes-equal? (quad-attrs q1) (quad-attrs q2))))
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(struct quad (attrs
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elems
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size
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in
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out
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inner
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offset
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origin
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printable
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draw-start
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draw
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draw-end)
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#:transparent
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#:property prop:custom-write
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(λ (v p w?) (display
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(format "<quad ~a~a>"
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(string-join (map ~v (flatten (hash->list (quad-attrs v))))
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" " #:before-first "(" #:after-last ")")
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(string-join (map ~v (quad-elems v)) " " #:before-first " ")) p))
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#:methods gen:equal+hash
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[(define equal-proc quad=?)
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(define (hash-proc h recur) (equal-hash-code h))
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(define (hash2-proc h recur) (equal-secondary-hash-code h))])
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(define (default-printable q [sig #f]) #t)
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(define (default-draw q surface)
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(for-each (λ (qi) (draw qi surface)) (quad-elems q)))
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;; why 'nw and 'ne as defaults for in and out points:
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;; if size is '(0 0), 'nw and 'ne are the same point,
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;; and everything piles up at the origin
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;; if size is otherwise, the items don't pile up (but rather lay out in a row)
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;; todo: convert immutable hashes to mutable on input?
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(define (make-quad
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#:type [type quad]
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#:attrs [attrs (make-hasheq)]
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#:elems [elems null]
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#:size [size '(0 0)]
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#:in [in 'nw]
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#:out [out 'ne]
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#:inner [inner #f]
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#:offset [offset '(0 0)]
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#:origin [origin '(0 0)]
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#:printable [printable default-printable]
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#:draw-start [draw-start void]
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#:draw [draw default-draw]
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#:draw-end [draw-end void]
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. args)
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(unless (andmap (λ (x) (not (pair? x))) elems)
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(raise-argument-error 'make-quad "elements that are not lists" elems))
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(match args
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[(list (== #false) elems ...) (make-quad #:elems elems)]
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[(list (? hash? attrs) elems ...) (make-quad #:attrs attrs #:elems elems)]
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[(list (? dict? assocs) elems ...) assocs (make-quad #:attrs (make-hasheq assocs) #:elems elems)]
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[(list elems ..1) (make-quad #:elems elems)]
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;; all cases end up below
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[null (type attrs
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elems
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size
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in
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out
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inner
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offset
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origin
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printable
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draw-start
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draw
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draw-end)]))
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(define q make-quad)
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(module+ test
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(require racket/port)
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(define q1 (q #f #\H #\e #\l #\o))
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(define q2 (q #f #\H #\e #\l #\o))
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(define q3 (q #f #\H #\e #\l))
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(check-true (equal? q1 q1))
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(check-true (equal? q1 q2))
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(check-false (equal? q1 q3))
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(define q4 (struct-copy quad q1
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[draw (λ (q surface) (display "foo" surface))]))
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(check-equal? (with-output-to-string (λ () (draw q4))) "foo"))
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