public ChakraHost()
{
if (Native.JsCreateRuntime(JavaScriptRuntimeAttributes.None, null, out runtime) !=
JavaScriptErrorCode.NoError)
{
throw new Exception("failed to create runtime.");
}
if (Native.JsCreateContext(runtime, out context) != JavaScriptErrorCode.NoError)
{
throw new Exception("failed to create execution context.");
}
if (Native.JsSetCurrentContext(context) != JavaScriptErrorCode.NoError)
{
throw new Exception("failed to set current context.");
}
// ES6 Promise callback
JavaScriptPromiseContinuationCallback promiseContinuationCallback =
delegate(JavaScriptValue task, IntPtr callbackState)
{
promiseCallback = task;
};
if (Native.JsSetPromiseContinuationCallback(promiseContinuationCallback, IntPtr.Zero) !=
JavaScriptErrorCode.NoError)
{
throw new Exception("failed to setup callback for ES6 Promise");
}
// Bind to global object
// setTimeout
SetTimeoutJavaScriptNativeFunction = SetTimeout.SetTimeoutJavaScriptNativeFunction;
DefineHostCallback("setTimeout", SetTimeoutJavaScriptNativeFunction);
SendToHostJavaScriptNativeFunction = CommunicationManager.SendToHostJavaScriptNativeFunction;
DefineHostCallback("sendToHost", SendToHostJavaScriptNativeFunction);
// Projections
if (Native.JsProjectWinRTNamespace("ChakraBridge") != JavaScriptErrorCode.NoError)
{
throw new Exception("failed to project ChakraBridge namespace.");
}
this.window = new Window();
ProjectObjectToGlobal(new Console(), "console");
ProjectObjectToGlobal(this.window, "window");
ProjectObjectToGlobal(this.window.navigator, "navigator");
ProjectObjectToGlobal(this.window.document, "document");
// Add references
RunScript(@"XMLHttpRequest = ChakraBridge.XMLHttpRequest;
HTMLCanvasElement = ChakraBridge.HTMLCanvasElementWrapper;
atob = window.atob;
btoa = window.btoa;");
#if DEBUG
// Debug
if (Native.JsStartDebugging() != JavaScriptErrorCode.NoError)
{
throw new Exception("failed to start debugging.");
}
#endif
}
public string RunScript(string script)
{
IntPtr returnValue;
JavaScriptValue result;
if (Native.JsRunScript(script, currentSourceContext++, "", out result) != JavaScriptErrorCode.NoError)
{
// Get error message and clear exception
JavaScriptValue exception;
if (Native.JsGetAndClearException(out exception) != JavaScriptErrorCode.NoError)
{
throw new Exception("failed to get and clear exception");
}
JavaScriptPropertyId messageName;
if (Native.JsGetPropertyIdFromName("message",
out messageName) != JavaScriptErrorCode.NoError)
{
throw new Exception("failed to get error message id");
}
JavaScriptValue messageValue;
if (Native.JsGetProperty(exception, messageName, out messageValue)
!= JavaScriptErrorCode.NoError)
{
throw new Exception("failed to get error message");
}
IntPtr message;
UIntPtr length;
if (Native.JsStringToPointer(messageValue, out message, out length) != JavaScriptErrorCode.NoError)
{
throw new Exception("failed to convert error message");
}
return(Marshal.PtrToStringUni(message));
}
// Execute promise tasks stored in promiseCallback
while (promiseCallback.IsValid)
{
JavaScriptValue task = promiseCallback;
promiseCallback = JavaScriptValue.Invalid;
JavaScriptValue promiseResult;
Native.JsCallFunction(task, null, 0, out promiseResult);
}
// Convert the return value.
JavaScriptValue stringResult;
UIntPtr stringLength;
if (Native.JsConvertValueToString(result, out stringResult) != JavaScriptErrorCode.NoError)
{
throw new Exception("failed to convert value to string.");
}
if (Native.JsStringToPointer(stringResult, out returnValue, out stringLength) !=
JavaScriptErrorCode.NoError)
{
throw new Exception("failed to convert return value.");
}
return(Marshal.PtrToStringUni(returnValue));
}
