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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "modules/speech/SpeechSynthesis.h"
#include "bindings/v8/ExceptionState.h"
#include "core/dom/ExecutionContext.h"
#include "modules/speech/SpeechSynthesisEvent.h"
#include "platform/speech/PlatformSpeechSynthesisVoice.h"
#include "wtf/CurrentTime.h"
namespace WebCore {
PassRefPtr<SpeechSynthesis> SpeechSynthesis::create(ExecutionContext* context)
{
return adoptRef(new SpeechSynthesis(context));
}
SpeechSynthesis::SpeechSynthesis(ExecutionContext* context)
: ContextLifecycleObserver(context)
, m_platformSpeechSynthesizer(PlatformSpeechSynthesizer::create(this))
, m_isPaused(false)
{
ScriptWrappable::init(this);
}
void SpeechSynthesis::setPlatformSynthesizer(PassOwnPtr<PlatformSpeechSynthesizer> synthesizer)
{
m_platformSpeechSynthesizer = synthesizer;
}
ExecutionContext* SpeechSynthesis::executionContext() const
{
return ContextLifecycleObserver::executionContext();
}
void SpeechSynthesis::voicesDidChange()
{
m_voiceList.clear();
if (!executionContext()->activeDOMObjectsAreStopped())
dispatchEvent(Event::create(EventTypeNames::voiceschanged));
}
const Vector<RefPtr<SpeechSynthesisVoice> >& SpeechSynthesis::getVoices()
{
if (m_voiceList.size())
return m_voiceList;
// If the voiceList is empty, that's the cue to get the voices from the platform again.
const Vector<RefPtr<PlatformSpeechSynthesisVoice> >& platformVoices = m_platformSpeechSynthesizer->voiceList();
size_t voiceCount = platformVoices.size();
for (size_t k = 0; k < voiceCount; k++)
m_voiceList.append(SpeechSynthesisVoice::create(platformVoices[k]));
return m_voiceList;
}
bool SpeechSynthesis::speaking() const
{
// If we have a current speech utterance, then that means we're assumed to be in a speaking state.
// This state is independent of whether the utterance happens to be paused.
return currentSpeechUtterance();
}
bool SpeechSynthesis::pending() const
{
// This is true if there are any utterances that have not started.
// That means there will be more than one in the queue.
return m_utteranceQueue.size() > 1;
}
bool SpeechSynthesis::paused() const
{
return m_isPaused;
}
void SpeechSynthesis::startSpeakingImmediately()
{
SpeechSynthesisUtterance* utterance = currentSpeechUtterance();
ASSERT(utterance);
utterance->setStartTime(monotonicallyIncreasingTime());
m_isPaused = false;
m_platformSpeechSynthesizer->speak(utterance->platformUtterance());
}
void SpeechSynthesis::speak(SpeechSynthesisUtterance* utterance, ExceptionState& exceptionState)
{
if (!utterance) {
exceptionState.throwTypeError("Invalid utterance argument");
return;
}
m_utteranceQueue.append(utterance);
// If the queue was empty, speak this immediately and add it to the queue.
if (m_utteranceQueue.size() == 1)
startSpeakingImmediately();
}
void SpeechSynthesis::cancel()
{
// Remove all the items from the utterance queue.
m_utteranceQueue.clear();
m_platformSpeechSynthesizer->cancel();
}
void SpeechSynthesis::pause()
{
if (!m_isPaused)
m_platformSpeechSynthesizer->pause();
}
void SpeechSynthesis::resume()
{
if (!currentSpeechUtterance())
return;
m_platformSpeechSynthesizer->resume();
}
void SpeechSynthesis::fireEvent(const AtomicString& type, SpeechSynthesisUtterance* utterance, unsigned long charIndex, const String& name)
{
if (!executionContext()->activeDOMObjectsAreStopped())
utterance->dispatchEvent(SpeechSynthesisEvent::create(type, charIndex, (currentTime() - utterance->startTime()), name));
}
void SpeechSynthesis::handleSpeakingCompleted(SpeechSynthesisUtterance* utterance, bool errorOccurred)
{
ASSERT(utterance);
bool didJustFinishCurrentUtterance = false;
// If the utterance that completed was the one we're currently speaking,
// remove it from the queue and start speaking the next one.
if (utterance == currentSpeechUtterance()) {
m_utteranceQueue.removeFirst();
didJustFinishCurrentUtterance = true;
}
// Always fire the event, because the platform may have asynchronously
// sent an event on an utterance before it got the message that we
// canceled it, and we should always report to the user what actually
// happened.
fireEvent(errorOccurred ? EventTypeNames::error : EventTypeNames::end, utterance, 0, String());
// Start the next utterance if we just finished one and one was pending.
if (didJustFinishCurrentUtterance && !m_utteranceQueue.isEmpty())
startSpeakingImmediately();
}
void SpeechSynthesis::boundaryEventOccurred(PassRefPtr<PlatformSpeechSynthesisUtterance> utterance, SpeechBoundary boundary, unsigned charIndex)
{
DEFINE_STATIC_LOCAL(const String, wordBoundaryString, ("word"));
DEFINE_STATIC_LOCAL(const String, sentenceBoundaryString, ("sentence"));
switch (boundary) {
case SpeechWordBoundary:
fireEvent(EventTypeNames::boundary, static_cast<SpeechSynthesisUtterance*>(utterance->client()), charIndex, wordBoundaryString);
break;
case SpeechSentenceBoundary:
fireEvent(EventTypeNames::boundary, static_cast<SpeechSynthesisUtterance*>(utterance->client()), charIndex, sentenceBoundaryString);
break;
default:
ASSERT_NOT_REACHED();
}
}
void SpeechSynthesis::didStartSpeaking(PassRefPtr<PlatformSpeechSynthesisUtterance> utterance)
{
if (utterance->client())
fireEvent(EventTypeNames::start, static_cast<SpeechSynthesisUtterance*>(utterance->client()), 0, String());
}
void SpeechSynthesis::didPauseSpeaking(PassRefPtr<PlatformSpeechSynthesisUtterance> utterance)
{
m_isPaused = true;
if (utterance->client())
fireEvent(EventTypeNames::pause, static_cast<SpeechSynthesisUtterance*>(utterance->client()), 0, String());
}
void SpeechSynthesis::didResumeSpeaking(PassRefPtr<PlatformSpeechSynthesisUtterance> utterance)
{
m_isPaused = false;
if (utterance->client())
fireEvent(EventTypeNames::resume, static_cast<SpeechSynthesisUtterance*>(utterance->client()), 0, String());
}
void SpeechSynthesis::didFinishSpeaking(PassRefPtr<PlatformSpeechSynthesisUtterance> utterance)
{
if (utterance->client())
handleSpeakingCompleted(static_cast<SpeechSynthesisUtterance*>(utterance->client()), false);
}
void SpeechSynthesis::speakingErrorOccurred(PassRefPtr<PlatformSpeechSynthesisUtterance> utterance)
{
if (utterance->client())
handleSpeakingCompleted(static_cast<SpeechSynthesisUtterance*>(utterance->client()), true);
}
SpeechSynthesisUtterance* SpeechSynthesis::currentSpeechUtterance() const
{
if (!m_utteranceQueue.isEmpty())
return m_utteranceQueue.first().get();
return 0;
}
const AtomicString& SpeechSynthesis::interfaceName() const
{
return EventTargetNames::SpeechSynthesisUtterance;
}
} // namespace WebCore
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