IDL: Support optional argument default value syntax

Source/bindings/tests/idls/TestObject.idl

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 358 matching lines @@
     DOMString stringMethodOptionalLongArg(optional long optionalLongArg);
     TestInterfaceEmpty testInterfaceEmptyMethodOptionalLongArg(optional long optionalLongArg);
     long longMethodOptionalLongArg(optional long optionalLongArg);
     void voidMethodLongArgOptionalLongArg(long longArg, optional long optionalLongArg);
     void voidMethodLongArgOptionalLongArgOptionalLongArg(long longArg, optional long optionalLongArg1, optional long optionalLongArg2);
     void voidMethodLongArgOptionalTestInterfaceEmptyArg(long longArg, optional TestInterfaceEmpty optionalTestInterfaceEmpty);
     void voidMethodTestInterfaceEmptyArgOptionalLongArg(TestInterfaceEmpty optionalTestInterfaceEmpty, optional long longArg);
     // Optional arguments: exceptional case
     void voidMethodOptionalDictionaryArg(optional Dictionary optionalDictionaryArg);
 
+    // Optional arguments with defaults
+    void voidMethodDefaultStringArg(optional DOMString defaultStringArg = "foo");
+    void voidMethodDefaultNullStringArg(optional DOMString defaultStringArg = null);
+    void voidMethodDefaultLongArg(optional long defaultLongArg = 10);
+    void voidMethodDefaultDoubleArg(optional double defaultDoubleArg = 0.5);
+    void voidMethodDefaultTrueBooleanArg(optional boolean defaultBooleanArg = true);
+    void voidMethodDefaultFalseBooleanArg(optional boolean defaultBooleanArg = false);
+    void voidMethodDefaultNullableStringArg(optional DOMString? defaultStringArg = null);
+    void voidMethodDefaultNullableTestInterfaceArg(optional TestInterface? defaultTestInterfaceArg = null);
+
     // Variadic operations
     void voidMethodVariadicStringArg(DOMString... variadicStringArgs);
     void voidMethodStringArgVariadicStringArg(DOMString stringArg, DOMString... variadicStringArgs);
     void voidMethodVariadicTestInterfaceEmptyArg(TestInterfaceEmpty... variadicTestInterfaceEmptyArgs);
     void voidMethodTestInterfaceEmptyArgVariadicTestInterfaceEmptyArg(TestInterfaceEmpty testInterfaceEmptyArg, TestInterfaceEmpty... variadicTestInterfaceEmptyArgs);
     void voidMethodVariadicTestInterfaceGarbageCollectedArg(TestInterfaceGarbageCollected... variadicTestInterfaceGarbageCollectedArg);
     void voidMethodVariadicTestInterfaceWillBeGarbageCollectedArg(TestInterfaceWillBeGarbageCollected... variadicTestInterfaceWillBeGarbageCollectedArg);
 
     // Overloaded methods
     void overloadedMethodA(long longArg);
     void overloadedMethodA(long longArg1, long longArg2);
     void overloadedMethodB(long longArg);
     void overloadedMethodB(DOMString stringArg, optional long longArg);
     void overloadedMethodC(long longArg);
     void overloadedMethodC(TestInterfaceEmpty testInterfaceEmptyArg);
     void overloadedMethodD(long longArg);
     void overloadedMethodD(long[] longArrayArg);
     void overloadedMethodE(long longArg);
     void overloadedMethodE(TestInterfaceEmpty? testInterfaceEmptyOrNullArg);
     void overloadedMethodF(optional DOMString stringArg);
     void overloadedMethodF(double doubleArg);
     void overloadedMethodG(long longArg);
-    void overloadedMethodG([Default=Null] TestInterfaceEmpty? testInterfaceEmptyOrNullArg);
+    void overloadedMethodG(optional TestInterfaceEmpty? testInterfaceEmptyOrNullArg = null);
     void overloadedMethodH(TestInterface testInterfaceArg);
     void overloadedMethodH(TestInterfaceEmpty testInterfaceEmptyArg);
     void overloadedMethodI(DOMString stringArg);
     void overloadedMethodI(double doubleArg);
 
 
     [PerWorldBindings] void overloadedPerWorldBindingsMethod();
     [PerWorldBindings] void overloadedPerWorldBindingsMethod(long longArg);
 
     static void overloadedStaticMethod(long longArg);
     static void overloadedStaticMethod(long longArg1, long longArg2);
 
     // Extended attributes for arguments
     // [Clamp]
     void voidMethodClampUnsignedShortArg([Clamp] unsigned short clampUnsignedShortArg);
     void voidMethodClampUnsignedLongArg([Clamp] unsigned long clampUnsignedLongArg);
     // [Default]
     void voidMethodDefaultUndefinedTestInterfaceEmptyArg([Default=Undefined] optional TestInterfaceEmpty defaultUndefinedTestInterfaceEmptyArg);
     void voidMethodDefaultUndefinedLongArg([Default=Undefined] optional long defaultUndefinedLongArg);
     void voidMethodDefaultUndefinedStringArg([Default=Undefined] optional DOMString defaultUndefinedStringArg);
-    void voidMethodDefaultNullStringStringArg([Default=NullString] optional DOMString defaultNullStringStringArg);
     // [EnforceRange]
     void voidMethodEnforceRangeLongArg([EnforceRange] long enforceRangeLongArg);
     // [TreatNullAs], [TreatUndefinedAs]
     void voidMethodTreatNullAsNullStringStringArg([TreatNullAs=NullString] DOMString treatNullAsNullStringStringArg);
     void voidMethodTreatNullAsNullStringTreatUndefinedAsNullStringStringArg([TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString treatNullAsNullStringStringArg);
 
     // Extended attributes for methods
     [LogActivity, LogAllWorlds] void activityLoggingAccessForAllWorldsMethod();
     [CallWith=ExecutionContext] void callWithExecutionContextVoidMethod();
     [CallWith=ScriptState] void callWithScriptStateVoidMethod();
@@ skipping 58 matching lines @@
     void voidMethodTestInterfaceWillBeGarbageCollectedArrayArg(TestInterfaceWillBeGarbageCollected[] testInterfaceWillBeGarbageCollectedArrayArg);
 
     // Extended attributes on referenced interfaces
     // (not self; self-reference tests at interface themselves)
     attribute TestInterface testInterfaceAttribute; // [ImplementedAs]
     attribute TestInterfaceGarbageCollected testInterfaceGarbageCollectedAttribute; // [GarbageCollected]
     attribute TestInterfaceGarbageCollected? testInterfaceGarbageCollectedOrNullAttribute; // [GarbageCollected]
     attribute TestInterfaceWillBeGarbageCollected testInterfaceWillBeGarbageCollectedAttribute; // [WillBeGarbageCollected]
     attribute TestInterfaceWillBeGarbageCollected? testInterfaceWillBeGarbageCollectedOrNullAttribute; // [WillBeGarbageCollected]
 };