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Added speech synthesis bypass engine (#2445)
* Added no-op speech synthesis engine * Update PR number * Update comment * Fix ESLint and rename to bypass * Update CHANGELOG.md Co-Authored-By: TJ Durnford <tjdford@gmail.com> * Apply PR comments
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packages/component/src/Speech/BypassSpeechSynthesisPonyfill.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| // Since this is a bypass, we will relax some ESLint rules. | ||
| // All classes/properties defined here are in W3C Web Speech API. | ||
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| /* eslint class-methods-use-this: "off" */ | ||
| /* eslint getter-return: "off" */ | ||
| /* eslint max-classes-per-file: ["error", 4] */ | ||
| /* eslint no-empty-function: "off" */ | ||
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| import EventTarget, { defineEventAttribute } from '../external/event-target-shim'; | ||
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| class SpeechSynthesisEvent { | ||
| constructor(type, utterance) { | ||
| this._type = type; | ||
| this._utterance = utterance; | ||
| } | ||
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| get charIndex() { | ||
| return 0; | ||
| } | ||
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| get elapsedTime() { | ||
| return 0; | ||
| } | ||
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| get name() {} | ||
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| get type() { | ||
| return this._type; | ||
| } | ||
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| get utterance() { | ||
| return this._utterance; | ||
| } | ||
| } | ||
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| class SpeechSynthesisUtterance extends EventTarget { | ||
| constructor(text) { | ||
| super(); | ||
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| this._lang = 'en-US'; | ||
| this._pitch = 1; | ||
| this._rate = 1; | ||
| this._text = text; | ||
| this._voice = null; | ||
| this._volume = 1; | ||
| } | ||
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| get lang() { | ||
| return this._lang; | ||
| } | ||
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| set lang(value) { | ||
| this._lang = value; | ||
| } | ||
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| get pitch() { | ||
| return this._pitch; | ||
| } | ||
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| set pitch(value) { | ||
| this._pitch = value; | ||
| } | ||
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| get rate() { | ||
| return this._rate; | ||
| } | ||
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| set rate(value) { | ||
| this._rate = value; | ||
| } | ||
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| get text() { | ||
| return this._text; | ||
| } | ||
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| set text(value) { | ||
| this._text = value; | ||
| } | ||
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| get voice() { | ||
| return this._voice; | ||
| } | ||
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| set voice(value) { | ||
| this._voice = value; | ||
| } | ||
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| get volume() { | ||
| return this._volume; | ||
| } | ||
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| set volume(value) { | ||
| this._volume = value; | ||
| } | ||
| } | ||
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| defineEventAttribute(SpeechSynthesisUtterance.prototype, 'boundary'); | ||
| defineEventAttribute(SpeechSynthesisUtterance.prototype, 'end'); | ||
| defineEventAttribute(SpeechSynthesisUtterance.prototype, 'error'); | ||
| defineEventAttribute(SpeechSynthesisUtterance.prototype, 'mark'); | ||
| defineEventAttribute(SpeechSynthesisUtterance.prototype, 'pause'); | ||
| defineEventAttribute(SpeechSynthesisUtterance.prototype, 'resume'); | ||
| defineEventAttribute(SpeechSynthesisUtterance.prototype, 'start'); | ||
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| class SpeechSynthesisVoice { | ||
| get default() { | ||
| return true; | ||
| } | ||
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| get lang() { | ||
| return 'en-US'; | ||
| } | ||
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| get localService() { | ||
| return true; | ||
| } | ||
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| get name() { | ||
| return 'English (US)'; | ||
| } | ||
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| get voiceURI() { | ||
| return 'English (US)'; | ||
| } | ||
| } | ||
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| class SpeechSynthesis extends EventTarget { | ||
| get paused() { | ||
| return false; | ||
| } | ||
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| get pending() { | ||
| return false; | ||
| } | ||
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| get speaking() { | ||
| return false; | ||
| } | ||
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| cancel() {} | ||
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| getVoices() { | ||
| return [new SpeechSynthesisVoice()]; | ||
| } | ||
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| pause() { | ||
| throw new Error('pause is not implemented.'); | ||
| } | ||
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| resume() { | ||
| throw new Error('resume is not implemented.'); | ||
| } | ||
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| speak(utterance) { | ||
| utterance.dispatchEvent(new SpeechSynthesisEvent('start', utterance)); | ||
| utterance.dispatchEvent(new SpeechSynthesisEvent('end', utterance)); | ||
| } | ||
| } | ||
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| defineEventAttribute(SpeechSynthesis.prototype, 'voiceschanged'); | ||
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| const speechSynthesis = new SpeechSynthesis(); | ||
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| export { speechSynthesis, SpeechSynthesisEvent, SpeechSynthesisUtterance, SpeechSynthesisVoice }; |
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