public ExternalFunctionTests()
{
var funcs = new DefaultFunctions <Maybe <object> >();
funcs.Register("GetValue", (args, context) =>
{
var maybe = context.Value;
if (maybe.HasValue && maybe.Value is TestObj o)
{
return(o.MemberFunction());
}
return("Fail");
});
parser = new ExpressionParser <Maybe <object> >(
new MaybeExpressionFactory(
MaybeMonad.Instance,
funcs));
}
public void EvalLegacyMathFunction(string exprString, object expected)
{
var funcs = new DefaultFunctions <object>();
funcs.Register("GetValue", (a, b) => Convert.ToDouble(a[1]));
var parseResult = VCExpression.ParseDefault(exprString, funcs);
var expr = parseResult.Expression;
var result = expr.Evaluate(new { });
Assert.That(result, Is.EqualTo(expected));
var funcs2 = new DefaultCSharpFunctions();
funcs2.Register("GetValue", (a, b) => $"Convert.ToDouble({a[1]})");
var parseResult2 = CSharpExpression.ParseMethod(exprString, funcs2);
var expr2 = parseResult2.Expression;
var result2 = expr2.Evaluate(new { });
Assert.That(result2, Is.EqualTo(expected));
}