Source/WebCore/bindings/js/ReadableStream.cpp

/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
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 *
 * THIS SOFTWARE IS PROVIDED BY CANON INC. ``AS IS'' AND ANY
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#include "config.h"
#include "ReadableStream.h"

#include "JSDOMConvertSequences.h"
#include "JSReadableStreamSink.h"
#include "JSReadableStreamSource.h"
#include "WebCoreJSClientData.h"


namespace WebCore {
using namespace JSC;

Ref<ReadableStream> ReadableStream::create(JSC::JSGlobalObject& lexicalGlobalObject, RefPtr<ReadableStreamSource>&& source)
{
    VM& vm = lexicalGlobalObject.vm();
    auto scope = DECLARE_CATCH_SCOPE(vm);

    auto& clientData = *static_cast<JSVMClientData*>(vm.clientData);
    auto& globalObject = *JSC::jsCast<JSDOMGlobalObject*>(&lexicalGlobalObject);

    auto* constructor = JSC::asObject(globalObject.get(&lexicalGlobalObject, clientData.builtinNames().ReadableStreamPrivateName()));

    ConstructData constructData;
    ConstructType constructType = constructor->methodTable(vm)->getConstructData(constructor, constructData);
    ASSERT(constructType != ConstructType::None);

    MarkedArgumentBuffer args;
    args.append(source ? toJSNewlyCreated(&lexicalGlobalObject, &globalObject, source.releaseNonNull()) : JSC::jsUndefined());
    ASSERT(!args.hasOverflowed());

    auto newReadableStream = jsDynamicCast<JSReadableStream*>(vm, JSC::construct(&lexicalGlobalObject, constructor, constructType, constructData, args));
    scope.assertNoException();

    return create(globalObject, *newReadableStream);
}

namespace ReadableStreamInternal {
static inline JSC::JSValue callFunction(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue jsFunction, JSC::JSValue thisValue, const JSC::ArgList& arguments)
{
    VM& vm = lexicalGlobalObject.vm();
    auto scope = DECLARE_CATCH_SCOPE(vm);
    JSC::CallData callData;
    auto callType = JSC::getCallData(vm, jsFunction, callData);
    ASSERT(callType != JSC::CallType::None);
    auto result = call(&lexicalGlobalObject, jsFunction, callType, callData, thisValue, arguments);
    scope.assertNoException();
    return result;
}
}

void ReadableStream::pipeTo(ReadableStreamSink& sink)
{
    auto& lexicalGlobalObject = *m_globalObject;
    JSVMClientData* clientData = static_cast<JSVMClientData*>(lexicalGlobalObject.vm().clientData);
    const Identifier& privateName = clientData->builtinFunctions().readableStreamInternalsBuiltins().readableStreamPipeToPrivateName();

    auto readableStreamPipeTo = m_globalObject->get(&lexicalGlobalObject, privateName);
    ASSERT(readableStreamPipeTo.isFunction(lexicalGlobalObject.vm()));

    MarkedArgumentBuffer arguments;
    arguments.append(readableStream());
    arguments.append(toJS(&lexicalGlobalObject, m_globalObject.get(), sink));
    ASSERT(!arguments.hasOverflowed());
    ReadableStreamInternal::callFunction(lexicalGlobalObject, readableStreamPipeTo, JSC::jsUndefined(), arguments);
}

std::pair<Ref<ReadableStream>, Ref<ReadableStream>> ReadableStream::tee()
{
    auto& lexicalGlobalObject = *m_globalObject;
    JSVMClientData* clientData = static_cast<JSVMClientData*>(lexicalGlobalObject.vm().clientData);
    const Identifier& privateName = clientData->builtinFunctions().readableStreamInternalsBuiltins().readableStreamTeePrivateName();

    auto readableStreamTee = m_globalObject->get(&lexicalGlobalObject, privateName);
    ASSERT(readableStreamTee.isFunction(lexicalGlobalObject.vm()));

    MarkedArgumentBuffer arguments;
    arguments.append(readableStream());
    arguments.append(JSC::jsBoolean(true));
    ASSERT(!arguments.hasOverflowed());
    auto returnedValue = ReadableStreamInternal::callFunction(lexicalGlobalObject, readableStreamTee, JSC::jsUndefined(), arguments);

    auto results = Detail::SequenceConverter<IDLInterface<ReadableStream>>::convert(lexicalGlobalObject, returnedValue);

    ASSERT(results.size() == 2);
    return std::make_pair(results[0].releaseNonNull(), results[1].releaseNonNull());
}

void ReadableStream::lock()
{
    auto& lexicalGlobalObject = *m_globalObject;
    VM& vm = lexicalGlobalObject.vm();
    auto scope = DECLARE_CATCH_SCOPE(vm);

    auto& clientData = *static_cast<JSVMClientData*>(vm.clientData);

    auto* constructor = JSC::asObject(m_globalObject->get(&lexicalGlobalObject, clientData.builtinNames().ReadableStreamDefaultReaderPrivateName()));

    ConstructData constructData;
    ConstructType constructType = constructor->methodTable(vm)->getConstructData(constructor, constructData);
    ASSERT(constructType != ConstructType::None);

    MarkedArgumentBuffer args;
    args.append(readableStream());
    ASSERT(!args.hasOverflowed());

    JSC::construct(&lexicalGlobalObject, constructor, constructType, constructData, args);
    scope.assertNoException();
}

static inline bool checkReadableStream(JSDOMGlobalObject& globalObject, JSReadableStream* readableStream, JSC::JSValue function)
{
    auto& lexicalGlobalObject = globalObject;

    ASSERT(function);
    JSC::MarkedArgumentBuffer arguments;
    arguments.append(readableStream);
    ASSERT(!arguments.hasOverflowed());
    return ReadableStreamInternal::callFunction(lexicalGlobalObject, function, JSC::jsUndefined(), arguments).isTrue();
}

bool ReadableStream::isLocked() const
{
    return checkReadableStream(*globalObject(), readableStream(), globalObject()->builtinInternalFunctions().readableStreamInternals().m_isReadableStreamLockedFunction.get());
}

bool ReadableStream::isDisturbed() const
{
    return checkReadableStream(*globalObject(), readableStream(), globalObject()->builtinInternalFunctions().readableStreamInternals().m_isReadableStreamDisturbedFunction.get());
}

bool ReadableStream::isDisturbed(JSGlobalObject& lexicalGlobalObject, JSValue value)
{
    auto& vm = lexicalGlobalObject.vm();
    auto& globalObject = *jsDynamicCast<JSDOMGlobalObject*>(vm, &lexicalGlobalObject);
    auto* readableStream = jsDynamicCast<JSReadableStream*>(vm, value);

    return checkReadableStream(globalObject, readableStream, globalObject.builtinInternalFunctions().readableStreamInternals().m_isReadableStreamDisturbedFunction.get());
}

}