Use nullptr instead of 0 in WebAudio

Source/modules/webaudio/AudioContext.cpp

 /*
  * Copyright (C) 2010, Google 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
@@ skipping 73 matching lines @@
 unsigned AudioContext::s_hardwareContextCount = 0;
 unsigned AudioContext::s_contextId = 0;
 
 AudioContext* AudioContext::create(Document& document, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (s_hardwareContextCount >= MaxHardwareContexts) {
         exceptionState.throwDOMException(
             SyntaxError,
             "number of hardware contexts reached maximum (" + String::number(MaxHardwareContexts) + ").");
-        return 0;
+        return nullptr;
     }
 
     AudioContext* audioContext = new AudioContext(&document);
     audioContext->suspendIfNeeded();
     return audioContext;
 }
 
 // Constructor for rendering to the audio hardware.
 AudioContext::AudioContext(Document* document)
     : ActiveDOMObject(document)
@@ skipping 208 matching lines @@
 
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     if (!mediaElement) {
         exceptionState.throwDOMException(
             InvalidStateError,
             "invalid HTMLMedialElement.");
-        return 0;
+        return nullptr;
     }
 
     // First check if this media element already has a source node.
     if (mediaElement->audioSourceNode()) {
         exceptionState.throwDOMException(
             InvalidStateError,
             "HTMLMediaElement already connected previously to a different MediaElementSourceNode.");
-        return 0;
+        return nullptr;
     }
 
     MediaElementAudioSourceNode* node = MediaElementAudioSourceNode::create(this, mediaElement);
 
     mediaElement->setAudioSourceNode(node);
 
     refNode(node); // context keeps reference until node is disconnected
     return node;
 }
 
 MediaStreamAudioSourceNode* AudioContext::createMediaStreamSource(MediaStream* mediaStream, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
 
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     if (!mediaStream) {
         exceptionState.throwDOMException(
             InvalidStateError,
             "invalid MediaStream source");
-        return 0;
+        return nullptr;
     }
 
     MediaStreamTrackVector audioTracks = mediaStream->getAudioTracks();
     if (audioTracks.isEmpty()) {
         exceptionState.throwDOMException(
             InvalidStateError,
             "MediaStream has no audio track");
-        return 0;
+        return nullptr;
     }
 
     // Use the first audio track in the media stream.
     MediaStreamTrack* audioTrack = audioTracks[0];
     OwnPtr<AudioSourceProvider> provider = audioTrack->createWebAudioSource();
     MediaStreamAudioSourceNode* node = MediaStreamAudioSourceNode::create(this, mediaStream, audioTrack, provider.release());
 
     // FIXME: Only stereo streams are supported right now. We should be able to accept multi-channel streams.
     node->setFormat(2, sampleRate());
 
@@ skipping 72 matching lines @@
                 IndexSizeError,
                 "number of output channels (" + String::number(numberOfInputChannels)
                 + ") exceeds maximum ("
                 + String::number(AudioContext::maxNumberOfChannels()) + ").");
         } else {
             exceptionState.throwDOMException(
                 IndexSizeError,
                 "buffer size (" + String::number(bufferSize)
                 + ") must be a power of two between 256 and 16384.");
         }
-        return 0;
+        return nullptr;
     }
 
     refNode(node); // context keeps reference until we stop making javascript rendering callbacks
     return node;
 }
 
 StereoPannerNode* AudioContext::createStereoPanner(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
@@ skipping 95 matching lines @@
 DelayNode* AudioContext::createDelay(double maxDelayTime, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     DelayNode* node = DelayNode::create(this, m_destinationNode->sampleRate(), maxDelayTime, exceptionState);
     if (exceptionState.hadException())
-        return 0;
+        return nullptr;
     return node;
 }
 
 ChannelSplitterNode* AudioContext::createChannelSplitter(ExceptionState& exceptionState)
 {
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
@@ skipping 11 matching lines @@
     }
 
     ChannelSplitterNode* node = ChannelSplitterNode::create(this, m_destinationNode->sampleRate(), numberOfOutputs);
 
     if (!node) {
         exceptionState.throwDOMException(
             IndexSizeError,
             "number of outputs (" + String::number(numberOfOutputs)
             + ") must be between 1 and "
             + String::number(AudioContext::maxNumberOfChannels()) + ".");
-        return 0;
+        return nullptr;
     }
 
     return node;
 }
 
 ChannelMergerNode* AudioContext::createChannelMerger(ExceptionState& exceptionState)
 {
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
@@ skipping 12 matching lines @@
     }
 
     ChannelMergerNode* node = ChannelMergerNode::create(this, m_destinationNode->sampleRate(), numberOfInputs);
 
     if (!node) {
         exceptionState.throwDOMException(
             IndexSizeError,
             "number of inputs (" + String::number(numberOfInputs)
             + ") must be between 1 and "
             + String::number(AudioContext::maxNumberOfChannels()) + ".");
-        return 0;
+        return nullptr;
     }
 
     return node;
 }
 
 OscillatorNode* AudioContext::createOscillator(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
@@ skipping 14 matching lines @@
 
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     if (!real) {
         exceptionState.throwDOMException(
             SyntaxError,
             "invalid real array");
-        return 0;
+        return nullptr;
     }
 
     if (!imag) {
         exceptionState.throwDOMException(
             SyntaxError,
             "invalid imaginary array");
-        return 0;
+        return nullptr;
     }
 
     if (real->length() > PeriodicWave::kMaxPeriodicWaveArraySize) {
         exceptionState.throwDOMException(
             IndexSizeError,
             ExceptionMessages::indexOutsideRange(
                 "length of the real part array",
                 real->length(),
                 1u,
                 ExceptionMessages::InclusiveBound,
                 PeriodicWave::kMaxPeriodicWaveArraySize,
                 ExceptionMessages::InclusiveBound));
-        return 0;
+        return nullptr;
     }
 
     if (imag->length() > PeriodicWave::kMaxPeriodicWaveArraySize) {
         exceptionState.throwDOMException(
             IndexSizeError,
             ExceptionMessages::indexOutsideRange(
                 "length of the imaginary part array",
                 imag->length(),
                 1u,
                 ExceptionMessages::InclusiveBound,
                 PeriodicWave::kMaxPeriodicWaveArraySize,
                 ExceptionMessages::InclusiveBound));
-        return 0;
+        return nullptr;
     }
 
     if (real->length() != imag->length()) {
         exceptionState.throwDOMException(
             IndexSizeError,
             "length of real array (" + String::number(real->length())
             + ") and length of imaginary array (" +  String::number(imag->length())
             + ") must match.");
-        return 0;
+        return nullptr;
     }
 
     return PeriodicWave::create(sampleRate(), real, imag);
 }
 
 size_t AudioContext::cachedSampleFrame() const
 {
     ASSERT(isMainThread());
 
     return m_cachedSampleFrame;
@@ skipping 636 matching lines @@
     // the destination node can GCed if JS has no references. stop() will also resolve the Promise
     // created here.
     stop();
 
     return promise;
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)