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Matthias Felleisen 2010-10-08 16:16:04 -04:00
parent 963adb64ce
commit 96bf9d2518
1 changed files with 0 additions and 110 deletions
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collects/2htdp/private/keywords.rkt
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#lang racket
(require (for-syntax "syn-aux.ss")
"syn-aux.ss"
"syn-aux-aux.ss"
"check-aux.rkt"
(only-in "universe.rkt" make-bundle)
(rename-in lang/prim (first-order->higher-order f2h)))
(provide [for-syntax WldSpec UniSpec])
(define-keywords AllSpec '() define-all
;; -- on-tick must specify a tick handler; it may specify a clock-tick rate
[on-tick
DEFAULT #'#f
(function-with-arity
1
except
[(_ f rate)
#'(list
(proc> 'on-tick (f2h f) 1)
(num> 'on-tick rate (lambda (x) (and (real? x) (positive? x)))
"positive number" "rate"))])]
;; -- state specifies whether to display the current state
[state
DEFAULT #'#f
(expr-with-check bool> "expected a boolean (show state or not)")]
;; -- check-with must specify a predicate
[check-with
DEFAULT #'True
(function-with-arity 1)])
; (create-world world0)
(define-keywords WldSpec AllSpec create-world
;; -- on-draw must specify a rendering function; it may specify dimensions
[on-draw to-draw
DEFAULT #'#f
(function-with-arity
1
except
[(_ f width height)
#'(list (proc> 'to-draw (f2h f) 1)
(nat> 'to-draw width "width")
(nat> 'to-draw height "height"))])]
;; -- on-mouse must specify a mouse event handler
[on-mouse
DEFAULT #'K
(function-with-arity 4)]
;; -- on-key must specify a key event handler
[on-key
DEFAULT #'K
(function-with-arity 2)]
;; -- on-release must specify a release event handler
[on-release
DEFAULT #'K
(function-with-arity 2)]
;; -- on-receive must specify a receive handler
[on-receive
DEFAULT #'#f
(function-with-arity 2)]
;; -- stop-when must specify a predicate; it may specify a rendering function
[stop-when
DEFAULT #'False
(function-with-arity
1
except
[(_ stop? last-picture)
#'(list (proc> 'stop-when (f2h stop?) 1)
(proc> 'stop-when (f2h last-picture) 1))])]
;; -- should the session be recorded and turned into PNGs and an animated GIF
[record?
DEFAULT #'#f
(expr-with-check bool> "expected a boolean (to record? or not)")]
[name
DEFAULT #'#f
(expr-with-check string> "expected a name (string) for the world")]
;; -- register must specify the internet address of a host (e.g., LOCALHOST)
[register
DEFAULT #'#f
(expr-with-check ip> "expected a host (ip address)")])
; (create-universe universe0)
(define-keywords UniSpec AllSpec create-universe
;; -- on-new must specify what happens when a world joins the universe
[on-new
DEFAULT #'"my-bad"
(function-with-arity 2)]
;; -- on-msg must specify what happens to a message from a world
[on-msg
DEFAULT #'"my-bad"
(function-with-arity 3)]
;; -- on-disconnect may specify what happens when a world drops out
[on-disconnect
;; ******************************************************************
DEFAULT #'(lambda (u w) (make-bundle u '() '()))
;; this is the wrong default function
;; instead of K there should be a function that produces a bundle
(function-with-arity 2)
;; ******************************************************************
]
;; -- to-string specifies how to render the universe as a string for display
[to-string
DEFAULT #'#f
(function-with-arity 1)])
(provide new-world)
(define new-world (create-world world0))
(provide new-universe)
(define new-universe (create-universe universe0))