72 lines
2.3 KiB
JavaScript
72 lines
2.3 KiB
JavaScript
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(function() {
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"use strict";
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var WebWorld =
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MACHINE.modules['whalesong/web-world/impl.rkt'].privateExports;
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var EventSource = WebWorld.EventSource;
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var EventHandler = WebWorld.EventHandler;
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var wrapFunction = WebWorld.wrapFunction;
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var makeClosure = plt.baselib.functions.makeClosure;
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var makePrimitiveProcedure = plt.baselib.functions.makePrimitiveProcedure;
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var finalizeClosureCall = plt.runtime.finalizeClosureCall;
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var checkProcedure = plt.baselib.check.checkProcedure;
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/**
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* Creates an event source coupled to a JavaScript function. Calling the function
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* should cause the event source to fire.
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*/
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var makeJsEventSource = function(startupProcedure, shutdownProcedure) {
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var enabled = false;
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var fireEvent;
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var sender = function(v) {
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if (enabled) {
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fireEvent(void(0), v);
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}
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};
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var JsEventSource = function() {
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this.startupData = void(0);
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};
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JsEventSource.prototype = plt.baselib.heir(EventSource.prototype);
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JsEventSource.prototype.onStart = function(_fireEvent) {
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this.startupData = startupProcedure(sender);
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enabled = true;
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fireEvent = _fireEvent;
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};
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JsEventSource.prototype.onStop = function() {
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shutdownProcedure(sender, this.startupData);
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enabled = false;
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fireEvent = void(0);
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};
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return new JsEventSource();
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};
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var makeWorldEventHandler = makeClosure(
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'make-world-event-handler',
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2,
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function(M) {
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var setupProcedure = checkProcedure(M, 'make-world-event-handler', 0);
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var shutdownProcedure = checkProcedure(M, 'make-world-event-handler', 1);
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var eventSource = makeJsEventSource(setupProcedure, shutdownProcedure);
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var makeHandler = makePrimitiveProcedure(
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'make-js-world-event',
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1,
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function(M) {
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var onEvent = wrapFunction(checkProcedure(M, 'js-world-event-handler', 0));
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return new EventHandler('js-world-event', eventSource, onEvent);
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});
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finalizeClosureCall(M, makeHandler);
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});
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EXPORTS['make-world-event-handler'] = makeWorldEventHandler;
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}()); |