/// <summary>
/// Creates a new <c>Object</c> that stores some external data.
/// </summary>
/// <remarks>
/// Requires an active script context.
/// </remarks>
/// <param name="data">External data that the object will represent. May be null.</param>
/// <param name="finalizer">
/// A callback for when the object is finalized. May be null.
/// </param>
/// <returns>The new <c>Object</c>.</returns>
public static JavaScriptValue CreateExternalObject(IntPtr data, JavaScriptObjectFinalizeCallback finalizer)
{
JavaScriptValue reference;
Native.ThrowIfError(Native.JsCreateExternalObject(data, finalizer, out reference));
return(reference);
}
public JsArrayBuffer CreateArrayBufferUtf8(string data)
{
if (data == null)
{
data = String.Empty;
}
JavaScriptValueSafeHandle externalArrayHandle;
int len = Encoding.UTF8.GetByteCount(data);
byte[] buffer = new byte[len + 1];
Encoding.UTF8.GetBytes(data, 0, data.Length, buffer, 0);
IntPtr ptrData = Marshal.AllocHGlobal(buffer.Length);
try
{
Marshal.Copy(buffer, 0, ptrData, buffer.Length);
GCHandle freeCallbackHandle = default(GCHandle);
JavaScriptObjectFinalizeCallback freeCallback = (ptr) =>
{
Marshal.FreeHGlobal(ptrData);
if (freeCallbackHandle.IsAllocated)
{
freeCallbackHandle.Free();
}
};
freeCallbackHandle = GCHandle.Alloc(freeCallback);
externalArrayHandle = m_engine.JsCreateExternalArrayBuffer(ptrData, (uint)data.Length, freeCallback, IntPtr.Zero);
}
catch (Exception)
{
//If anything goes wrong, free the unmanaged memory.
//This is not a finally as if success, the memory will be freed automagially.
Marshal.FreeHGlobal(ptrData);
throw;
}
var result = m_valuePool.GetOrAdd(externalArrayHandle, () =>
{
return(new JsManagedExternalArrayBuffer(m_engine, Context, externalArrayHandle, ptrData));
});
var resultArrayBuffer = result as JsArrayBuffer;
if (resultArrayBuffer == null)
{
throw new InvalidOperationException($"Expected the result object to be a JsArrayBuffer, however the value was {result.GetType()}");
}
return((JsArrayBuffer)result);
}
/// <summary>
/// Executes a script, automatically storing the script value within an ExternalArrayBuffer.
/// </summary>
/// <remarks>
/// This extension method exists for simplicity.
/// </remarks>
/// <param name="jsrt"></param>
/// <param name="script"></param>
/// <param name="sourceContext"></param>
/// <param name="sourceUrl"></param>
/// <param name="parseAttributes"></param>
/// <param name="result"></param>
/// <returns>A JavaScriptValueSafeHandle containing the result.</returns>
public static JavaScriptValueSafeHandle JsRunScript(this IJavaScriptEngine jsrt, string script, JavaScriptSourceContext sourceContext = default(JavaScriptSourceContext), string sourceUrl = null, JavaScriptParseScriptAttributes parseAttributes = JavaScriptParseScriptAttributes.None)
{
var ptrScript = Marshal.StringToHGlobalAnsi(script);
JavaScriptObjectFinalizeCallback callback = (IntPtr ptr) =>
{
//Release pinned string.
Marshal.FreeHGlobal(ptrScript);
};
var scriptHandle = jsrt.JsCreateExternalArrayBuffer(ptrScript, (uint)script.Length, callback, IntPtr.Zero);
if (sourceContext == default(JavaScriptSourceContext))
{
sourceContext = JavaScriptSourceContext.None;
}
JavaScriptValueSafeHandle sourceUrlHandle;
if (string.IsNullOrWhiteSpace(sourceUrl))
{
sourceUrl = "[eval code]";
}
sourceUrlHandle = jsrt.JsCreateString(EvalSourceUrl, (ulong)EvalSourceUrl.Length);
if (parseAttributes == default(JavaScriptParseScriptAttributes))
{
parseAttributes = JavaScriptParseScriptAttributes.None;
}
try
{
return(jsrt.JsRun(scriptHandle, sourceContext, sourceUrlHandle, parseAttributes));
}
finally
{
//Release variables created during this operation.
sourceUrlHandle.Dispose();
scriptHandle.Dispose();
}
}
internal static extern JavaScriptErrorCode JsCreateExternalObject(IntPtr data, JavaScriptObjectFinalizeCallback finalizeCallback, out JavaScriptValue obj);
internal static extern JavaScriptErrorCode JsCreateExternalObject(IntPtr data, JavaScriptObjectFinalizeCallback finalizeCallback, out JavaScriptValue obj);
internal static extern JavaScriptErrorCode JsCreateExternalArrayBuffer(IntPtr data, uint byteLength, JavaScriptObjectFinalizeCallback finalizeCallback, IntPtr callbackState, out bool result);
internal static extern JavaScriptErrorCode JsCreateExternalArrayBuffer(IntPtr data, uint byteLength, JavaScriptObjectFinalizeCallback finalizeCallback, IntPtr callbackState, out bool result);
/// <summary>
/// Creates a new <c>Object</c> that stores some external data.
/// </summary>
/// <remarks>
/// Requires an active script context.
/// </remarks>
/// <param name="data">External data that the object will represent. May be null.</param>
/// <param name="finalizer">
/// A callback for when the object is finalized. May be null.
/// </param>
/// <returns>The new <c>Object</c>.</returns>
public static JavaScriptValue CreateExternalObject(IntPtr data, JavaScriptObjectFinalizeCallback finalizer)
{
JavaScriptValue reference;
Native.ThrowIfError(Native.JsCreateExternalObject(data, finalizer, out reference));
return reference;
}
public static extern JavaScriptErrorCode JsCreateExternalArrayBuffer(IntPtr data, uint byteLength, JavaScriptObjectFinalizeCallback finalizeCallback, IntPtr callbackState, out JavaScriptValue obj);
/// <summary>
/// map internal memory to chakracore engine
/// </summary>
/// <param name="data">data block</param>
/// <param name="byteLength">length of data</param>
/// <param name="finalizeCallback">callback for object disposed in js engine</param>
/// <param name="callbackState">reference, can be null</param>
/// <returns></returns>
public static JavaScriptValue CreateExternalArrayBuffer(IntPtr data, uint byteLength, JavaScriptObjectFinalizeCallback finalizeCallback, IntPtr callbackState)
{
Native.ThrowIfError(Native.JsCreateExternalArrayBuffer(data, byteLength, finalizeCallback, callbackState, out JavaScriptValue result));
return(result);
}
