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function SpeechPlugin() {
'use strict';
return {
getModuleName: function() { return 'SpeechPlugin'; },
interpreterProxy: null,
primHandler: null,
voiceInput: null,
semaphoreIndex: null,
shouldListen: false,
recognition: null,
synth: self.speechSynthesis,
setInterpreter: function(anInterpreter) {
this.interpreterProxy = anInterpreter;
this.primHandler = this.interpreterProxy.vm.primHandler;
return true;
},
/*
* Speech Synthesis Primitive
*/
primitiveSpeak: function(argCount) {
var text, voice;
if (argCount === 1) {
text = this.interpreterProxy.stackValue(0).bytesAsString();
} else if (argCount === 2) {
text = this.interpreterProxy.stackValue(1).bytesAsString();
var voiceName = this.interpreterProxy.stackValue(0).bytesAsString();
voice = this.synth.getVoices().filter(function(voice) {
return voice.name === voiceName;
});
} else {
return false;
}
var msg = new SpeechSynthesisUtterance(text);
if (voice && voice.length > 0) { msg.voice = voice[0]; }
this.synth.speak(msg);
this.interpreterProxy.pop(argCount);
return true;
},
/*
* Speech Recognition Primitives
*/
primitiveRegisterSemaphore: function(argCount) {
if (argCount !== 1) return false;
this.semaphoreIndex = this.interpreterProxy.stackIntegerValue(0);
this.interpreterProxy.pop(argCount);
return true;
},
primitiveUnregisterSemaphore: function(argCount) {
if (argCount !== 0) return false;
this.semaphoreIndex = null;
return true;
},
primitiveGetLastRecognitionResult: function(argCount) {
if (argCount !== 0) return false;
if (this.semaphoreIndex === null) return false;
if (this.voiceInput === null) return false;
var stString = this.primHandler.makeStArray(this.voiceInput);
this.voiceInput = [];
this.interpreterProxy.popthenPush(1, stString);
return true;
},
primitiveStartListening: function(argCount) {
if (argCount !== 0) return false;
this.recognition = new webkitSpeechRecognition();
this.recognition.lang = 'en-US'; // en-GB
this.recognition.interimResults = true;
// this.recognition.maxAlternatives = 1;
this.recognition.onresult = this._onRecognitionResult.bind(this);
this.recognition.onerror = function(event) { console.log(event); };
/*
* Imitate `this.recognition.continuous = true` because it is currently
* only supported by Google Chrome.
*/
this.recognition.onend = function(event) {
if (this.shouldListen) {
this.recognition.start();
}
}.bind(this);
this.shouldListen = true;
this.recognition.start();
return true;
},
_onRecognitionResult: function(event) {
this.voiceInput = [];
for (var i = event.resultIndex; i < event.results.length; i++) {
var result = event.results[i];
var sqResult = [result.isFinal, []];
for (var j = 0; j < result.length; j++) {
var transcript = result[j].transcript;
var now = Date.now();
sqResult[1].push([transcript, result[j].confidence]);
}
if (sqResult[1].length > 0) {
this.voiceInput.push(sqResult);
}
}
if (this.semaphoreIndex !== null && this.voiceInput.length > 0) {
this.primHandler.signalSemaphoreWithIndex(this.semaphoreIndex);
}
},
primitiveStopListening: function(argCount) {
if (argCount !== 0) return false;
this.voiceInput = [];
this.recognition.stop();
this.shouldListen = false;
return true;
},
};
}
function registerSpeechPlugin() {
if (typeof Squeak === "object" && Squeak.registerExternalModule) {
if (('webkitSpeechRecognition' in self)) {
Squeak.registerExternalModule('SpeechPlugin', SpeechPlugin());
} else {
console.warn('SpeechPlugin: Web Speech API is not supported by this browser.');
}
} else self.setTimeout(registerSpeechPlugin, 100);
};
registerSpeechPlugin();
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