/// <summary>
/// Executes the program stored in the <code>CompiledScript</code> object using
/// the supplied <code>Bindings</code> of attributes as the <code>ENGINE_SCOPE</code> of the
/// associated <code>ScriptEngine</code> during script execution. If bindings is null,
/// then the effect of calling this method is same as that of eval(getEngine().getContext()).
/// <para>.
/// The <code>GLOBAL_SCOPE</code> <code>Bindings</code>, <code>Reader</code> and <code>Writer</code>
/// associated with the default <code>ScriptContext</code> of the associated <code>ScriptEngine</code> are used.
///
/// </para>
/// </summary>
/// <param name="bindings"> The bindings of attributes used for the <code>ENGINE_SCOPE</code>.
/// </param>
/// <returns> The return value from the script execution
/// </returns>
/// <exception cref="ScriptException"> if an error occurs. </exception>
public virtual object Eval(IBindings bindings)
{
try
{
IScriptContext ctxt = GetEngine().GetContext();
if (bindings != null)
{
SimpleScriptContext tempctxt = new SimpleScriptContext();
tempctxt.SetBindings(bindings, ScriptContext_Fields.ENGINE_SCOPE);
tempctxt.SetBindings(ctxt.GetBindings(ScriptContext_Fields.GLOBAL_SCOPE), ScriptContext_Fields.GLOBAL_SCOPE);
tempctxt.SetWriter(ctxt.GetWriter());
tempctxt.SetReader(ctxt.GetReader());
tempctxt.SetErrorWriter(ctxt.GetErrorWriter());
ctxt = tempctxt;
}
return(Eval(ctxt));
}
catch (ScriptException ex)
{
throw ex;
}
catch (System.Exception ex)
{
throw new ScriptException(ex);
}
}
/// <summary>
/// Returns a <code>SimpleScriptContext</code>. The <code>SimpleScriptContext</code>:
/// <br><br>
/// <ul>
/// <li>Uses the specified <code>Bindings</code> for its <code>ENGINE_SCOPE</code>
/// </li>
/// <li>Uses the <code>Bindings</code> returned by the abstract <code>getGlobalScope</code>
/// method as its <code>GLOBAL_SCOPE</code>
/// </li>
/// <li>Uses the Reader and Writer in the default <code>ScriptContext</code> of this
/// <code>ScriptEngine</code>
/// </li>
/// </ul>
/// <br><br>
/// A <code>SimpleScriptContext</code> returned by this method is used to implement eval methods
/// using the abstract <code>eval(Reader,Bindings)</code> and <code>eval(String,Bindings)</code>
/// versions.
/// </summary>
/// <param name="nn"> Bindings to use for the <code>ENGINE_SCOPE</code> </param>
/// <returns> The <code>SimpleScriptContext</code> </returns>
protected internal virtual IScriptContext GetScriptContext(IBindings nn)
{
SimpleScriptContext ctxt = new SimpleScriptContext();
IBindings gs = GetBindings(ScriptContext_Fields.GLOBAL_SCOPE);
if (gs != null)
{
ctxt.SetBindings(gs, ScriptContext_Fields.GLOBAL_SCOPE);
}
if (nn != null)
{
ctxt.SetBindings(nn, ScriptContext_Fields.ENGINE_SCOPE);
}
else
{
throw new System.NullReferenceException("Engine scope Bindings may not be null.");
}
ctxt.SetReader(context.GetReader());
ctxt.SetWriter(context.GetWriter());
ctxt.SetErrorWriter(context.GetErrorWriter());
return(ctxt);
}
