NadekoBot/NadekoBot.Core/Modules/Utility/CalcCommands.cs

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C#
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using Discord.Commands;
using NadekoBot.Extensions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using NadekoBot.Common.Attributes;
namespace NadekoBot.Modules.Utility
{
public partial class Utility
{
[Group]
public class CalcCommands : NadekoSubmodule
{
[NadekoCommand, Usage, Description, Aliases]
public async Task Calculate([Remainder] string expression)
{
var expr = new NCalc.Expression(expression, NCalc.EvaluateOptions.IgnoreCase);
expr.EvaluateParameter += Expr_EvaluateParameter;
var result = expr.Evaluate();
if (expr.Error == null)
await Context.Channel.SendConfirmAsync("⚙ " + GetText("result"), result.ToString());
else
await Context.Channel.SendErrorAsync("⚙ " + GetText("error"), expr.Error);
}
private static void Expr_EvaluateParameter(string name, NCalc.ParameterArgs args)
{
switch (name.ToLowerInvariant())
{
case "pi":
args.Result = Math.PI;
break;
case "e":
args.Result = Math.E;
break;
}
}
[NadekoCommand, Usage, Description, Aliases]
public async Task CalcOps()
{
var selection = typeof(Math).GetTypeInfo()
.GetMethods()
.Distinct(new MethodInfoEqualityComparer())
.Select(x => x.Name)
.Except(new[]
{
"ToString",
"Equals",
"GetHashCode",
"GetType"
});
await Context.Channel.SendConfirmAsync(GetText("calcops", Prefix), string.Join(", ", selection));
}
}
private class MethodInfoEqualityComparer : IEqualityComparer<MethodInfo>
{
public bool Equals(MethodInfo x, MethodInfo y) => x.Name == y.Name;
public int GetHashCode(MethodInfo obj) => obj.Name.GetHashCode();
}
}
}