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/*
* Copyright (C) 2015 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.
*/
#include "config.h"
#include "UIScriptContext.h"
#include "StringFunctions.h"
#include "UIScriptController.h"
#include <JavaScriptCore/JSContextRef.h>
#include <JavaScriptCore/JSValueRef.h>
#include <WebKit/WKRetainPtr.h>
#include <WebKit/WKString.h>
#include <WebKit/WKStringPrivate.h>
using namespace WTR;
static inline bool isPersistentCallbackID(unsigned callbackID)
{
return callbackID < firstNonPersistentCallbackID;
}
UIScriptContext::UIScriptContext(UIScriptContextDelegate& delegate)
: m_context(Adopt, JSGlobalContextCreate(nullptr))
, m_delegate(delegate)
{
m_controller = UIScriptController::create(*this);
JSObjectRef globalObject = JSContextGetGlobalObject(m_context.get());
JSValueRef exception = nullptr;
m_controller->makeWindowObject(m_context.get(), globalObject, &exception);
}
UIScriptContext::~UIScriptContext()
{
m_controller->contextDestroyed();
}
void UIScriptContext::runUIScript(WKStringRef script, unsigned scriptCallbackID)
{
m_currentScriptCallbackID = scriptCallbackID;
auto scriptRef = toJS(script);
JSValueRef exception = nullptr;
JSValueRef result = JSEvaluateScript(m_context.get(), scriptRef.get(), 0, 0, 1, &exception);
if (!hasOutstandingAsyncTasks()) {
JSValueRef stringifyException = nullptr;
requestUIScriptCompletion(JSValueToStringCopy(m_context.get(), result, &stringifyException));
tryToCompleteUIScriptForCurrentParentCallback();
}
}
unsigned UIScriptContext::nextTaskCallbackID(CallbackType type)
{
if (type == CallbackTypeNonPersistent)
return ++m_nextTaskCallbackID + firstNonPersistentCallbackID;
return type;
}
unsigned UIScriptContext::prepareForAsyncTask(JSValueRef callback, CallbackType type)
{
unsigned callbackID = nextTaskCallbackID(type);
JSValueProtect(m_context.get(), callback);
Task task;
task.parentScriptCallbackID = m_currentScriptCallbackID;
task.callback = callback;
ASSERT(!m_callbacks.contains(callbackID));
m_callbacks.add(callbackID, task);
return callbackID;
}
void UIScriptContext::asyncTaskComplete(unsigned callbackID)
{
Task task = m_callbacks.take(callbackID);
ASSERT(task.callback);
JSValueRef exception = nullptr;
JSObjectRef callbackObject = JSValueToObject(m_context.get(), task.callback, &exception);
m_currentScriptCallbackID = task.parentScriptCallbackID;
exception = nullptr;
JSObjectCallAsFunction(m_context.get(), callbackObject, JSContextGetGlobalObject(m_context.get()), 0, nullptr, &exception);
JSValueUnprotect(m_context.get(), task.callback);
tryToCompleteUIScriptForCurrentParentCallback();
m_currentScriptCallbackID = 0;
}
unsigned UIScriptContext::registerCallback(JSValueRef taskCallback, CallbackType type)
{
if (m_callbacks.contains(type))
unregisterCallback(type);
return prepareForAsyncTask(taskCallback, type);
}
void UIScriptContext::unregisterCallback(unsigned callbackID)
{
Task task = m_callbacks.take(callbackID);
ASSERT(task.callback);
JSValueUnprotect(m_context.get(), task.callback);
}
JSValueRef UIScriptContext::callbackWithID(unsigned callbackID)
{
Task task = m_callbacks.get(callbackID);
return task.callback;
}
void UIScriptContext::fireCallback(unsigned callbackID)
{
Task task = m_callbacks.get(callbackID);
ASSERT(task.callback);
JSValueRef exception = nullptr;
JSObjectRef callbackObject = JSValueToObject(m_context.get(), task.callback, &exception);
m_currentScriptCallbackID = task.parentScriptCallbackID;
exception = nullptr;
JSObjectCallAsFunction(m_context.get(), callbackObject, JSContextGetGlobalObject(m_context.get()), 0, nullptr, &exception);
tryToCompleteUIScriptForCurrentParentCallback();
m_currentScriptCallbackID = 0;
}
void UIScriptContext::requestUIScriptCompletion(JSStringRef result)
{
ASSERT(m_currentScriptCallbackID);
if (currentParentCallbackIsPendingCompletion())
return;
// This request for the UI script to complete is not fulfilled until the last non-persistent task for the parent callback is finished.
m_uiScriptResultsPendingCompletion.add(m_currentScriptCallbackID, result ? JSStringRetain(result) : nullptr);
}
void UIScriptContext::tryToCompleteUIScriptForCurrentParentCallback()
{
if (!currentParentCallbackIsPendingCompletion() || currentParentCallbackHasOutstandingAsyncTasks())
return;
JSStringRef result = m_uiScriptResultsPendingCompletion.take(m_currentScriptCallbackID);
WKRetainPtr<WKStringRef> uiScriptResult = adoptWK(WKStringCreateWithJSString(result));
m_delegate.uiScriptDidComplete(uiScriptResult.get(), m_currentScriptCallbackID);
m_currentScriptCallbackID = 0;
if (result)
JSStringRelease(result);
}
JSObjectRef UIScriptContext::objectFromRect(const WKRect& rect) const
{
JSObjectRef object = JSObjectMake(m_context.get(), nullptr, nullptr);
JSObjectSetProperty(m_context.get(), object, adopt(JSStringCreateWithUTF8CString("left")).get(), JSValueMakeNumber(m_context.get(), rect.origin.x), kJSPropertyAttributeNone, nullptr);
JSObjectSetProperty(m_context.get(), object, adopt(JSStringCreateWithUTF8CString("top")).get(), JSValueMakeNumber(m_context.get(), rect.origin.y), kJSPropertyAttributeNone, nullptr);
JSObjectSetProperty(m_context.get(), object, adopt(JSStringCreateWithUTF8CString("width")).get(), JSValueMakeNumber(m_context.get(), rect.size.width), kJSPropertyAttributeNone, nullptr);
JSObjectSetProperty(m_context.get(), object, adopt(JSStringCreateWithUTF8CString("height")).get(), JSValueMakeNumber(m_context.get(), rect.size.height), kJSPropertyAttributeNone, nullptr);
return object;
}
bool UIScriptContext::currentParentCallbackHasOutstandingAsyncTasks() const
{
for (auto entry : m_callbacks) {
unsigned callbackID = entry.key;
Task task = entry.value;
if (task.parentScriptCallbackID == m_currentScriptCallbackID && !isPersistentCallbackID(callbackID))
return true;
}
return false;
}
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