V8Collection.h   [plain text]

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#ifndef V8Collection_h
#define V8Collection_h

#include "HTMLFormElement.h"
#include "HTMLSelectElement.h"
#include "V8Binding.h"
#include "V8Proxy.h"
#include <v8.h>

namespace WebCore {
    // FIXME: These functions should be named using to* since they return the item (get* is used for method that take a ref param).
    // See https://bugs.webkit.org/show_bug.cgi?id=24664.

    inline v8::Handle<v8::Value> getV8Object(void* implementation, v8::Local<v8::Value> implementationType)
    {
        if (!implementation)
            return v8::Handle<v8::Value>();
        V8ClassIndex::V8WrapperType type = V8ClassIndex::FromInt(implementationType->Int32Value());
        if (type == V8ClassIndex::NODE)
            return V8DOMWrapper::convertNodeToV8Object(static_cast<Node*>(implementation));
        return V8DOMWrapper::convertToV8Object(type, implementation);
    }

    template<class Collection> static Collection* toNativeCollection(v8::Local<v8::Object> object)
    {
        return reinterpret_cast<Collection*>(object->GetPointerFromInternalField(v8DOMWrapperObjectIndex));
    }

    template<class T> static v8::Handle<v8::Value> getV8Object(PassRefPtr<T> implementation, v8::Local<v8::Value> implementationType)
    {
        return getV8Object(implementation.get(), implementationType);
    }

    // Returns named property of a collection.
    template<class Collection, class ItemType> static v8::Handle<v8::Value> getNamedPropertyOfCollection(v8::Local<v8::String> name, v8::Local<v8::Object> object,
                                                                                                         v8::Local<v8::Value> implementationType)
    {
        // FIXME: assert object is a collection type
        ASSERT(V8DOMWrapper::maybeDOMWrapper(object));
        ASSERT(V8DOMWrapper::domWrapperType(object) != V8ClassIndex::NODE);
        Collection* collection = toNativeCollection<Collection>(object);
        AtomicString propertyName = toAtomicWebCoreStringWithNullCheck(name);
        return getV8Object<ItemType>(collection->namedItem(propertyName), implementationType);
    }

    // A template of named property accessor of collections.
    template<class Collection, class ItemType> static v8::Handle<v8::Value> collectionNamedPropertyGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
    {
        v8::Handle<v8::Value> value = info.Holder()->GetRealNamedPropertyInPrototypeChain(name);

        if (!value.IsEmpty())
            return value;

        // Search local callback properties next to find IDL defined
        // properties.
        if (info.Holder()->HasRealNamedCallbackProperty(name))
            return notHandledByInterceptor();
        return getNamedPropertyOfCollection<Collection, ItemType>(name, info.Holder(), info.Data());
    }

    // Returns the property at the index of a collection.
    template<class Collection, class ItemType> static v8::Handle<v8::Value> getIndexedPropertyOfCollection(uint32_t index, v8::Local<v8::Object> object,
                                                                                                           v8::Local<v8::Value> implementationType)
    {
        // FIXME: Assert that object must be a collection type.
        ASSERT(V8DOMWrapper::maybeDOMWrapper(object));
        ASSERT(V8DOMWrapper::domWrapperType(object) != V8ClassIndex::NODE);
        Collection* collection = toNativeCollection<Collection>(object);
        return getV8Object<ItemType>(collection->item(index), implementationType);
    }

    // A template of index interceptor of collections.
    template<class Collection, class ItemType> static v8::Handle<v8::Value> collectionIndexedPropertyGetter(uint32_t index, const v8::AccessorInfo& info)
    {
        return getIndexedPropertyOfCollection<Collection, ItemType>(index, info.Holder(), info.Data());
    }

    // Get an array containing the names of indexed properties of HTMLSelectElement and HTMLFormElement.
    template<class Collection> static v8::Handle<v8::Array> nodeCollectionIndexedPropertyEnumerator(const v8::AccessorInfo& info)
    {
        ASSERT(V8DOMWrapper::maybeDOMWrapper(info.Holder()));
        ASSERT(V8DOMWrapper::domWrapperType(info.Holder()) == V8ClassIndex::NODE);
        Collection* collection = toNativeCollection<Collection>(info.Holder());
        int length = collection->length();
        v8::Handle<v8::Array> properties = v8::Array::New(length);
        for (int i = 0; i < length; ++i) {
            // FIXME: Do we need to check that the item function returns a non-null value for this index?
            v8::Handle<v8::Integer> integer = v8::Integer::New(i);
            properties->Set(integer, integer);
        }
        return properties;
    }

    // Get an array containing the names of indexed properties in a collection.
    template<class Collection> static v8::Handle<v8::Array> collectionIndexedPropertyEnumerator(const v8::AccessorInfo& info)
    {
        ASSERT(V8DOMWrapper::maybeDOMWrapper(info.Holder()));
        Collection* collection = toNativeCollection<Collection>(info.Holder());
        int length = collection->length();
        v8::Handle<v8::Array> properties = v8::Array::New(length);
        for (int i = 0; i < length; ++i) {
            // FIXME: Do we need to check that the item function returns a non-null value for this index?
            v8::Handle<v8::Integer> integer = v8::Integer::New(i);
            properties->Set(integer, integer);
        }
        return properties;
    }


    // A template for indexed getters on collections of strings that should return null if the resulting string is a null string.
    template<class Collection> static v8::Handle<v8::Value> collectionStringOrNullIndexedPropertyGetter(uint32_t index, const v8::AccessorInfo& info)
    {
        // FIXME: assert that object must be a collection type
        ASSERT(V8DOMWrapper::maybeDOMWrapper(info.Holder()));
        Collection* collection = toNativeCollection<Collection>(info.Holder());
        String result = collection->item(index);
        return v8StringOrNull(result);
    }


    // A template for indexed getters on collections of strings.
    template<class Collection> static v8::Handle<v8::Value> collectionStringIndexedPropertyGetter(uint32_t index, const v8::AccessorInfo& info)
    {
        // FIXME: assert that object must be a collection type
        ASSERT(V8DOMWrapper::maybeDOMWrapper(info.Holder()));
        Collection* collection = toNativeCollection<Collection>(info.Holder());
        String result = collection->item(index);
        return v8String(result);
    }


    // Add indexed getter to the function template for a collection.
    template<class Collection, class ItemType> static void setCollectionIndexedGetter(v8::Handle<v8::FunctionTemplate> desc, V8ClassIndex::V8WrapperType type)
    {
        desc->InstanceTemplate()->SetIndexedPropertyHandler(collectionIndexedPropertyGetter<Collection, ItemType>, 0, 0, 0, collectionIndexedPropertyEnumerator<Collection>,
                                                            v8::Integer::New(V8ClassIndex::ToInt(type)));
    }


    // Add named getter to the function template for a collection.
    template<class Collection, class ItemType> static void setCollectionNamedGetter(v8::Handle<v8::FunctionTemplate> desc, V8ClassIndex::V8WrapperType type)
    {
        desc->InstanceTemplate()->SetNamedPropertyHandler(collectionNamedPropertyGetter<Collection, ItemType>, 0, 0, 0, 0, v8::Integer::New(V8ClassIndex::ToInt(type)));
    }

    // Add indexed getter returning a string or null to a function template for a collection.
    template<class Collection> static void setCollectionStringOrNullIndexedGetter(v8::Handle<v8::FunctionTemplate> desc)
    {
        desc->InstanceTemplate()->SetIndexedPropertyHandler(collectionStringOrNullIndexedPropertyGetter<Collection>, 0, 0, 0, collectionIndexedPropertyEnumerator<Collection>);
    }


    // Add indexed getter returning a string to a function template for a collection.
    template<class Collection> static void setCollectionStringIndexedGetter(v8::Handle<v8::FunctionTemplate> desc)
    {
        desc->InstanceTemplate()->SetIndexedPropertyHandler(collectionStringIndexedPropertyGetter<Collection>, 0, 0, 0, collectionIndexedPropertyEnumerator<Collection>);
    }

    v8::Handle<v8::Value> toOptionsCollectionSetter(uint32_t index, v8::Handle<v8::Value>, HTMLSelectElement*);

} // namespace WebCore

#endif // V8Collection_h