Add constructors for WebAudio nodes

third_party/WebKit/Source/modules/webaudio/OscillatorNode.cpp

 /*
  * Copyright (C) 2012, 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 336 matching lines @@
     DCHECK(isMainThread());
 
     if (context.isContextClosed()) {
         context.throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return new OscillatorNode(context);
 }
 
+OscillatorNode* OscillatorNode::create(BaseAudioContext* context, const OscillatorOptions& options, ExceptionState& exceptionState)
+{
+    OscillatorNode* node = create(*context, exceptionState);
+
+    if (!node)
+        return nullptr;
+
+    node->handleChannelOptions(options, exceptionState);
+
+    if (options.hasType()) {
+        if (options.type() == "custom" && !options.hasPeriodicWave()) {
+            exceptionState.throwDOMException(
+                InvalidStateError,
+                "'type' cannot be set to 'custom' without also specifying 'periodicWave'");
+            return nullptr;
+        }
+        if (options.type() != "custom" && options.hasPeriodicWave()) {
+            exceptionState.throwDOMException(
+                InvalidStateError,
+                "'type' MUST be 'custom' instead of '"
+                + options.type()
+                + "' if 'periodicWave' is also given");
+            return nullptr;
+        }
+
+        // At this both type and periodicWave are consistently defined.  In that
+        // case, don't set the type if periodicWave is specified because that
+        // will cause an (incorrect) error to be signaled.
+        if (options.type() != "custom")
+            node->setType(options.type(), exceptionState);
+    }
+    if (options.hasDetune())
+        node->detune()->setValue(options.detune());
+    if (options.hasFrequency())
+        node->frequency()->setValue(options.frequency());
+
+    if (options.hasPeriodicWave())
+        node->setPeriodicWave(options.periodicWave());
+
+    return node;
+}
+
 DEFINE_TRACE(OscillatorNode)
 {
     visitor->trace(m_frequency);
     visitor->trace(m_detune);
     AudioScheduledSourceNode::trace(visitor);
 }
 
 OscillatorHandler& OscillatorNode::oscillatorHandler() const
 {
     return static_cast<OscillatorHandler&>(handler());
@@ skipping 19 matching lines @@
     return m_detune;
 }
 
 void OscillatorNode::setPeriodicWave(PeriodicWave* wave)
 {
     oscillatorHandler().setPeriodicWave(wave);
 }
 
 } // namespace blink