public bool TryEvaluate(ContextStack contextStack, out object result)
{
try
{
var evaluater = new Expr.Evaluator();
evaluater.VariableHolder = contextStack;
result = evaluater.Eval(ast);
}
catch (Exception e)
{
throw new Exception($"eval express `{express}` error: {e.Message}", e);
}
return(true);
}
public static void RunConsoleREPL()
{
Type type = typeof(string);
Parser ep = new Parser();
Evaluator evaluater = new Evaluator();
ParameterVariableHolder pvh = new ParameterVariableHolder();
pvh.Parameters["char"] = new Parameter(typeof(char));
pvh.Parameters["sbyte"] = new Parameter(typeof(sbyte));
pvh.Parameters["byte"] = new Parameter(typeof(byte));
pvh.Parameters["short"] = new Parameter(typeof(short));
pvh.Parameters["ushort"] = new Parameter(typeof(ushort));
pvh.Parameters["int"] = new Parameter(typeof(int));
pvh.Parameters["uint"] = new Parameter(typeof(uint));
pvh.Parameters["long"] = new Parameter(typeof(string));
pvh.Parameters["ulong"] = new Parameter(typeof(ulong));
pvh.Parameters["float"] = new Parameter(typeof(float));
pvh.Parameters["double"] = new Parameter(typeof(double));
pvh.Parameters["decimal"] = new Parameter(typeof(decimal));
pvh.Parameters["DateTime"] = new Parameter(typeof(DateTime));
pvh.Parameters["string"] = new Parameter(typeof(string));
pvh.Parameters["Guid"] = new Parameter(typeof(Guid));
pvh.Parameters["Convert"] = new Parameter(typeof(Convert));
pvh.Parameters["Math"] = new Parameter(typeof(Math));
pvh.Parameters["Array "] = new Parameter(typeof(Array));
pvh.Parameters["Random"] = new Parameter(typeof(Random));
pvh.Parameters["TimeZone"] = new Parameter(typeof(TimeZone));
pvh.Parameters["AppDomain "] = new Parameter(typeof(AppDomain));
pvh.Parameters["Console"] = new Parameter(typeof(Console));
pvh.Parameters["evaluater"] = new Parameter(evaluater);
evaluater.VariableHolder = pvh;
while (true)
{
System.Console.WriteLine("Input line,press Return to Eval:");
string line = System.Console.ReadLine().Trim();
if (string.IsNullOrEmpty(line))
{
break;
}
try
{
Tree tree = ep.Parse(line);
tree.Print(System.Console.Out);
object result = evaluater.Eval(tree);
if (result != null)
{
System.Console.WriteLine("Resut:{0}", result);
}
else
{
System.Console.WriteLine("Resut is null");
}
}
catch (Exception e)
{
System.Console.WriteLine("Exception:" + e.GetType().Name + "->" + e.Message);
}
}
}