/// <summary> Evaluates a line or script. </summary>
/// <param name="context"> Information about the line to be executed. </param>
/// <param name="arguments"> The provided arguments to the line. </param>
/// <param name="contents"> The contents of the line to execute. </param>
/// <returns> The value of the expression. </returns>
public IValue Evaluate(LineContext context, Arguments arguments, string contents)
{
var host = new HostObject(arguments);
Session session = _engine.CreateSession(host);
session.ImportNamespace("System");
session.ImportNamespace("System.Linq");
session.ImportNamespace("System.Collections.Generic");
session.ImportNamespace("System.Text");
const string format = "var {0} = Value(GetHostValue<{1}>(\"{0}\"));";
const string formatActual = "var {0}_ = GetHostValue<{1}>(\"{0}\");";
foreach (Argument arg in arguments.All)
{
session.Execute(String.Format(format, arg.Name, arg.ArgumentValue.ValueType.FullName));
session.Execute(String.Format(formatActual, arg.Name, arg.ArgumentValue.ValueType.FullName));
}
try
{
object result = session.Execute(contents);
return(SafeValue.FromRawValue(result));
}
catch (CompilationErrorException e)
{
var error = new Exception(string.Format("Invalid Script for '{0}': {1}", context.Name, e.Message), e);
return(SafeValue.FromException(error));
}
catch (Exception e)
{
return(SafeValue.FromException(e));
}
}