public ExpressionResult Evaluate(T target, EvaluationContext context)
{
ExpressionResult result = null;
foreach (var expr in Expressions)
{
result = expr.Evaluate(target, context);
}
return(result);
}
public Func <IReadOnlyList <object>, ExpressionResult> GetMethod(T target, string name)
{
var method = target.GetType().GetMethod(name);
var parameters = method.GetParameters();
return(args => parameters.Length != args.Count
? ExpressionResult.Error(
"ArgumentLengthMismatch",
$"Expected {parameters.Length} arguments to {name} method got {args.Count}")
: Wrap(name, () => method.Invoke(target, args.ToArray())));
}
public ExpressionResult Evaluate(T target, EvaluationContext context)
{
var results = ArgList.Select(arg => arg.Evaluate(target, context)).ToArray();
if (results.Any(r => r.IsError))
{
return(ExpressionResult.Error(results));
}
var args = results.Select(arg => arg.Value).ToList();
return(new ExpressionResult(args));
}
public ExpressionResult Evaluate(T target, EvaluationContext context)
{
var mapped = items
.Select(item => item.Evaluate(target, context))
.ToList();
if (mapped.Any(m => m.IsError))
{
return(ExpressionResult.Error(mapped.ToArray()));
}
return(new ExpressionResult(
new System.Collections.Generic.List <object>(mapped.Select(m => m.Value))));
}
public ExpressionResult Evaluate(T target, EvaluationContext context)
{
var args = Args.Evaluate(target, context);
if (args.IsError)
{
return(ExpressionResult.Error(args));
}
if (args.Value is IReadOnlyList <object> funcArgs)
{
return(EvalFunc(target, funcArgs, context));
}
return(ExpressionResult.TypeError("FunctionArgs", args.Value?.GetType()));
}
private ExpressionResult Wrap(string name, Func <object> invoke)
{
try
{
var result = invoke();
if (result is ExpressionResult er)
{
return(er);
}
return(new ExpressionResult(result));
}
catch (Exception ex)
{
return(ExpressionResult.Error("MethodEvalError", $"Exception evaluating method '{name}', '{ex.Message}'"));
}
}
public ExpressionResult Evaluate(T target, EvaluationContext context)
{
var baseRes = Base.Evaluate(target, context);
var exponentRes = Exponent.Evaluate(target, context);
if (baseRes.IsError || exponentRes.IsError)
{
return(ExpressionResult.Error(baseRes, exponentRes));
}
var baseValue = baseRes.Value.CastDouble();
var exponentValue = exponentRes.Value.CastDouble();
if (baseValue == null || exponentValue == null)
{
return(ExpressionResult.TypeError("^", baseRes.Value?.GetType(), exponentRes.Value?.GetType()));
}
var result = Math.Pow(baseValue.Value, exponentValue.Value);
return(new ExpressionResult(result));
}
protected override ExpressionResult Evaluate(object left, object right)
{
if (right is IList <object> rl && left is IComparable lc)
{
if (rl.Count != 2)
{
return(ExpressionResult.Error(
"ParameterMismatch",
"Between operator expects an array of exactly two elements on the right side"));
}
var first = rl[0];
var second = rl[1];
if (first is IComparable fc && second is IComparable sc)
{
return(Value(lc.CompareTo(fc) >= 0 && lc.CompareTo(sc) <= 0));
}
return(ExpressionResult.TypeError(Op, first?.GetType(), second?.GetType()));
}
return(ExpressionResult.TypeError(Op, left?.GetType(), right?.GetType()));
}
protected virtual ExpressionResult Evaluate(bool left, bool right)
{
return(ExpressionResult.TypeError(Op, typeof(bool)));
}
protected virtual ExpressionResult Evaluate(string left, string right)
{
return(ExpressionResult.TypeError(Op, typeof(string)));
}
protected virtual ExpressionResult Evaluate(long left, long right)
{
return(ExpressionResult.TypeError(Op, typeof(int), typeof(long)));
}
protected virtual ExpressionResult Evaluate(double left, double right)
{
return(ExpressionResult.TypeError(Op, typeof(double)));
}
protected virtual ExpressionResult Evaluate(decimal left, decimal right)
{
return(ExpressionResult.TypeError(Op, typeof(decimal)));
}