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adding where-am-i as a cs019 example, using signatures

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This commit is contained in:
Danny Yoo 2011-10-04 15:33:25 -04:00
parent a717bde102
commit c4ec1ae744
4 changed files with 112 additions and 5 deletions
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4
cs019/cs019.rkt
View File

@ -74,6 +74,10 @@
(define View$ (Sig: view?))
(provide View$)
(define Event$ (Sig: event?))
(provide Event$)
(require "../resource.rkt")
(provide (all-from-out "../resource.rkt"))

9
examples/cs019/where-am-i/index.html Normal file
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@ -0,0 +1,9 @@
<html>
<head><title>Where in the world am I?</title></head>
<body>
<p>
I am at: <span id="real-location">dunno</span>.
The mock location says: <span id="mock-location">dunno</span>.
</p>
</body>
</html>

59
examples/cs019/where-am-i/where-am-i.rkt Normal file
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@ -0,0 +1,59 @@
#lang planet dyoo/whalesong/cs019
(define-resource index.html)
(define-struct: coord ([lat : Number$]
[lng : Number$]))
(define (coord/unknown? x)
(or (coord? x)
(and (symbol? x)
(symbol=? x 'unknown))))
(define Coord/Unknown$ (Sig: coord/unknown?))
(define-struct: world ([real : Coord/Unknown$]
[mock : Coord/Unknown$]))
(define World$ (Sig: world?))
(define: (location-change [world : World$] [dom : View$] [evt : Event$]) -> World$
(make-world (make-coord (event-ref evt "latitude")
(event-ref evt "longitude"))
(world-mock world)))
(define: (mock-location-change [world : World$] [dom : View$] [evt : Event$]) -> World$
(make-world (world-real world)
(make-coord (event-ref evt "latitude")
(event-ref evt "longitude"))))
(define: (draw [world : World$] [dom : View$]) -> View$
(local [(define v1 (if (coord? (world-real world))
(update-view-text (view-focus dom "real-location")
(format "lat=~a, lng=~a"
(coord-lat (world-real world))
(coord-lng (world-real world))))
dom))
(define v2 (if (coord? (world-mock world))
(update-view-text (view-focus v1 "mock-location")
(format "lat=~a, lng=~a"
(coord-lat (world-mock world))
(coord-lng (world-mock world))))
v1))]
v2))
(big-bang (make-world 'unknown 'unknown)
(initial-view index.html)
(to-draw draw)
(on-location-change location-change)
(on-mock-location-change mock-location-change))

45
scribblings/cs019.scrbl
View File

@ -26,7 +26,8 @@
quasiquote
bitmap/url
current-output-port
lambda)))
lambda
true false)))
@(define-runtime-path whalesong-path "..")
@ -197,6 +198,11 @@ consumes the DOM as an argument, since the DOM, too, is a source of
external state in a program.}]
This program cannot be executed directly in Racket/DrRacket,
unfortunately, but it can be compiled through Whalesong and @link["http://hashcollision.org/whalesong/examples/cs019/tick-tock/tick-tock.html"]{run in the
browser}.
@subsection{More web-world examples}
@ -251,7 +257,13 @@ Uses @racket[on-location-change] and @racket[on-mock-location-change] to demonst
}
]
These examples are written in a less featureful language level
(@litchar{#lang planet dyoo/whalesong}), which is why it uses explicit
@racket[require] statements to pull in support for
@racketmodname/this-package[web-world] and
@racketmodname/this-package[resource]. As long as you use
@litchar{#lang planet dyoo/whalesong/cs019}, you shouldn't need to
require those particular libraries.
@section{API}
@ -286,11 +298,18 @@ to a web page.
(big-bang ...
(initial-view page1.html))
}|
If both the @racket[initial-view] and @racket[to-draw] are omitted
from a @racket[big-bang], then @racket[big-bang] will render the world
value itself.
}
@defproc[(stop-when [stop? ([w world] [dom view] -> boolean)]) big-bang-handler]{
Tells @racket[big-bang] when to stop.
For example,
@codeblock|{
...
(define-struct world (given expected))
@ -303,6 +322,8 @@ Tells @racket[big-bang] when to stop.
(big-bang ...
(stop-when stop?))
}|
will stop the computation as soon as @racket[stop?] returns @racket[true].
}
@ -520,6 +541,18 @@ Dom nodes can be created by using @racket[xexp->dom], which converts a
nodes whose DOM representation will be the way they print. This
including images.}
@defproc[(view-insert-left [v view] [d dom]) view]{
Add the dom node @racket[d] as the previous sibling of the focused node.
Focus moves to the inserted node.}
@defproc[(view-insert-right [v view] [d dom]) view]{
Add the dom node @racket[d] as the next sibling of the focused node.
Focus moves to the inserted node.}
@defproc[(view-remove [v view]) view]{
Remove the dom node at the focus from the view @racket[v]. Focus tries to move
to the right, if there's a next sibling. If that fails, focus then
@ -542,6 +575,8 @@ can accept the event as an argument.
@defstruct[event ([kvpairs (listof (list symbol (or/c string number)))])]{}
@defthing[Event$ sig]{The signature for an event.}
@defproc[(event-ref [evt event?] [name (or/c symbol string)]) value]{
Get an value from the event, given its @racket[name].
}
@ -692,7 +727,7 @@ The signature of a resource.
@defproc[(resource->url [a-resource resource?]) string?]{
Given a resource, gets a URL.
Given a resource, gets its URL.
For example,
@codeblock|{
@ -704,8 +739,8 @@ For example,
(bitmap/url (resource->url my-whale-image-resource)))
}|
(This particular example is somewhat redundant, because image
resources behave already as images.)
This particular example is somewhat redundant, because image resources
behave already as images.
}