public void JsSerializedScriptCanBeParsedWithCallbacks()
{
if (CommonWindowsEngine == null)
{
return;
}
var script = "(()=>{return 6*7;})()";
string sourceUrl = "[eval code]";
bool loaded = false;
bool unloaded = false;
using (var runtimeHandle = Engine.JsCreateRuntime(JavaScriptRuntimeAttributes.None, null))
{
using (var contextHandle = Engine.JsCreateContext(runtimeHandle))
{
Engine.JsSetCurrentContext(contextHandle);
byte[] buffer = new byte[1024];
uint bufferSize = (uint)buffer.Length;
CommonWindowsEngine.JsSerializeScript(script, buffer, ref bufferSize);
JavaScriptSerializedScriptLoadSourceCallback loadCallback = (JavaScriptSourceContext sourceContext, out StringBuilder scriptBuffer) =>
{
loaded = true;
scriptBuffer = new StringBuilder(script);
return(true);
};
JavaScriptSerializedScriptUnloadCallback unloadCallback = (JavaScriptSourceContext sourceContext) =>
{
unloaded = true;
};
var fnHandle = CommonWindowsEngine.JsParseSerializedScriptWithCallback(loadCallback, unloadCallback, buffer, JavaScriptSourceContext.GetNextSourceContext(), sourceUrl);
Assert.NotEqual(JavaScriptValueSafeHandle.Invalid, fnHandle);
var handleType = Engine.JsGetValueType(fnHandle);
Assert.True(handleType == JsValueType.Function);
//Get the string representation of the function. This triggers the load callback.
var fnStringHandle = Engine.JsConvertValueToString(fnHandle);
var stringPtr = CommonWindowsEngine.JsStringToPointer(fnStringHandle, out ulong length);
Assert.True(stringPtr != IntPtr.Zero);
Assert.True(length > 0);
fnStringHandle.Dispose();
fnHandle.Dispose();
}
Engine.JsCollectGarbage(runtimeHandle);
}
Assert.True(loaded);
Assert.True(unloaded);
}
public static string GetStringUtf8(this IJavaScriptEngine jsrt, JavaScriptValueSafeHandle stringHandle, bool autoConvert = false)
{
bool stringHandleWasCreated = false;
if (stringHandle == null || stringHandle == JavaScriptValueSafeHandle.Invalid)
{
throw new ArgumentNullException(nameof(stringHandle));
}
//If Auto Convert is specified, ensure that the type is a string, otherwise convert it.
if (autoConvert)
{
var handleValueType = jsrt.JsGetValueType(stringHandle);
if (handleValueType != JsValueType.String)
{
var convertedToStringHandle = jsrt.JsConvertValueToString(stringHandle);
stringHandle = convertedToStringHandle;
stringHandleWasCreated = true;
}
}
//Get the size
var size = jsrt.JsCopyString(stringHandle, null, 0);
if ((int)size > int.MaxValue)
{
throw new OutOfMemoryException("Exceeded maximum string length.");
}
byte[] result = new byte[(int)size];
var written = jsrt.JsCopyString(stringHandle, result, (ulong)result.Length);
var strResult = Encoding.UTF8.GetString(result, 0, result.Length);
if (stringHandleWasCreated)
{
stringHandle.Dispose();
}
return(strResult);
}
