1 files changed, 150 insertions, 0 deletions
diff --git a/src/bun.js/bindings/webcore/JSDOMConvertNullable.h b/src/bun.js/bindings/webcore/JSDOMConvertNullable.h
new file mode 100644
index 000000000..a3e4b5cc4
--- /dev/null
+++ b/src/bun.js/bindings/webcore/JSDOMConvertNullable.h
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2016 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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.
+ */
+
+#pragma once
+
+#include "IDLTypes.h"
+#include "JSDOMConvertAny.h"
+#include "JSDOMConvertInterface.h"
+#include "JSDOMConvertNumbers.h"
+#include "JSDOMConvertStrings.h"
+
+namespace WebCore {
+
+namespace Detail {
+
+template<typename IDLType>
+struct NullableConversionType;
+
+template<typename IDLType> 
+struct NullableConversionType {
+    using Type = typename IDLNullable<IDLType>::ImplementationType;
+};
+
+template<typename T>
+struct NullableConversionType<IDLInterface<T>> {
+    using Type = typename Converter<IDLInterface<T>>::ReturnType;
+};
+
+template<>
+struct NullableConversionType<IDLAny> {
+    using Type = typename Converter<IDLAny>::ReturnType;
+};
+
+}
+
+template<typename T> struct Converter<IDLNullable<T>> : DefaultConverter<IDLNullable<T>> {
+    using ReturnType = typename Detail::NullableConversionType<T>::Type;
+    
+    // 1. If Type(V) is not Object, and the conversion to an IDL value is being performed
+    // due to V being assigned to an attribute whose type is a nullable callback function
+    // that is annotated with [LegacyTreatNonObjectAsNull], then return the IDL nullable
+    // type T? value null.
+    //
+    // NOTE: Handled elsewhere.
+    //
+    // 2. Otherwise, if V is null or undefined, then return the IDL nullable type T? value null.
+    // 3. Otherwise, return the result of converting V using the rules for the inner IDL type T.
+
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value);
+    }
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSC::JSObject& thisObject)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value, thisObject);
+    }
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSDOMGlobalObject& globalObject)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value, globalObject);
+    }
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, ExceptionThrower&& exceptionThrower)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSC::JSObject& thisObject, ExceptionThrower&& exceptionThrower)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value, thisObject, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue value, JSDOMGlobalObject& globalObject, ExceptionThrower&& exceptionThrower)
+    {
+        if (value.isUndefinedOrNull())
+            return T::nullValue();
+        return Converter<T>::convert(lexicalGlobalObject, value, globalObject, std::forward<ExceptionThrower>(exceptionThrower));
+    }
+};
+
+template<typename T> struct JSConverter<IDLNullable<T>> {
+    using ImplementationType = typename IDLNullable<T>::ImplementationType;
+
+    static constexpr bool needsState = JSConverter<T>::needsState;
+    static constexpr bool needsGlobalObject = JSConverter<T>::needsGlobalObject;
+
+    template<typename U>
+    static JSC::JSValue convert(U&& value)
+    {
+        if (T::isNullValue(value))
+            return JSC::jsNull();
+        return JSConverter<T>::convert(T::extractValueFromNullable(value));
+    }
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, U&& value)
+    {
+        if (T::isNullValue(value))
+            return JSC::jsNull();
+        return JSConverter<T>::convert(lexicalGlobalObject, T::extractValueFromNullable(value));
+    }
+    template<typename U>
+    static JSC::JSValue convert(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, U&& value)
+    {
+        if (T::isNullValue(value))
+            return JSC::jsNull();
+        return JSConverter<T>::convert(lexicalGlobalObject, globalObject, T::extractValueFromNullable(value));
+    }
+
+    template<typename U>
+    static JSC::JSValue convertNewlyCreated(JSC::JSGlobalObject& lexicalGlobalObject, JSDOMGlobalObject& globalObject, U&& value)
+    {
+        if (T::isNullValue(value))
+            return JSC::jsNull();
+        return JSConverter<T>::convert(lexicalGlobalObject, globalObject, T::extractValueFromNullable(value));
+    }
+};
+
+
+} // namespace WebCore