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functional reactive programming with livescript
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| import prelude | |
| Signal = -> new (class SignalClass | |
| (register) -> | |
| @handlers = [] | |
| register @send | |
| send: (value) ~> | |
| @_value = value | |
| for handler in @handlers => handler value | |
| @_memo = value | |
| new: (adder) ~> | |
| Signal (send) ~> | |
| @handlers.push adder send | |
| lift: (fn) ~> | |
| @new (send) -> (value) -> | |
| send fn value | |
| keep-if: (test) ~> | |
| @new (send) -> (value) ~> | |
| if test value then send value | |
| when-true: ~> @keep-if -> it | |
| foldp: (def, fn) ~> | |
| signal = @new (send) -> (value) -> | |
| send (fn value, signal._memo ? def) | |
| drop-repeats: (def) ~> | |
| signal = @keep-if (value) ~> | |
| signal._memo != value | |
| count: ~> | |
| @foldp 0, (value, memo) -> | |
| memo + 1 | |
| delay: (ms) ~> | |
| @new (send) -> (value) -> | |
| _.delay (-> send value), ms | |
| throttle: (ms) ~> | |
| @new (send) -> | |
| _.throttle ((value) -> send value), ms | |
| latch: (ms) ~> | |
| signal = @new (send) -> | |
| send-false = _.debounce (-> send false), ms | |
| (value) -> send true; send-false() | |
| signal.drop-repeats() | |
| sample-on: (signal) ~> | |
| @new (send) ~> | |
| signal.lift ~> send @_value | |
| -> | |
| )(...arguments) # use Signal constructor without 'new' | |
| DomInput = (event, el = document) -> | |
| Signal (send) ~> $ el .on event, send | |
| class Keyboard | |
| @isDown = (keyCode) -> | |
| updown = Signal (send) -> | |
| reg = (event) -> DomInput event .keep-if (event) -> | |
| event.keyCode == keyCode | |
| reg \keydown .lift -> send true | |
| reg \keyup .lift -> send false | |
| updown.drop-repeats() | |
| @arrows = -> | |
| class Mouse | |
| @position = | |
| Signal (send) -> | |
| for event in <[ mousemove mousedown mouseup ]> | |
| DomInput event | |
| .lift -> send x: it.clientX, y: it.clientY | |
| @isDown = | |
| Signal (send) -> | |
| DomInput \mousedown .lift -> send true | |
| DomInput \mouseup .lift -> send false | |
| @isClicked = | |
| Signal (send) -> | |
| DomInput \click .lift -> send true; send false | |
| @clicks = | |
| Mouse.isClicked.when-true() | |
| # examples | |
| __ = -> console.log ...arguments; it | |
| Mouse.position | |
| .sample-on Mouse.clicks | |
| .lift -> __ 'mouse position on click', it | |
| Mouse.position | |
| .latch 1000 | |
| .lift -> | |
| if it is true => __ 'mouse is active' | |
| else __ 'mouse is inactive: not moved in 1 sec' | |
| Keyboard.isDown 32 | |
| .keep-true() | |
| .delay 500 | |
| .count() | |
| .lift -> __ 'space presses (delayed): ', it |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| </head> | |
| <body> | |
| <script src="components/prelude-ls/prelude-browser.js"></script> | |
| <script src="components/underscore/underscore.js"></script> | |
| <script src="components/jquery/jquery.js"></script> | |
| <script src="furp.js"></script> | |
| </body> | |
| </html> |
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