Eval parser

This commit is contained in:
appelemac 2016-05-29 19:45:52 +02:00
parent 5a01162859
commit 7185a308fb
3 changed files with 96 additions and 1 deletions

View File

@ -0,0 +1,88 @@
using NadekoBot.Classes;
using System;
using Mathos.Parser;
using System.Threading.Tasks;
using Discord.Commands;
using System.Text.RegularExpressions;
namespace NadekoBot.Modules.Searches.Commands
{
class EvalCommand : DiscordCommand
{
public EvalCommand(DiscordModule module) : base(module)
{
}
internal override void Init(CommandGroupBuilder cgb)
{
cgb.CreateCommand(Module.Prefix + "evaluate")
.Alias(Module.Prefix + "eval")
.Description("Evaluate a mathematical expression")
.Parameter("expression", ParameterType.Unparsed)
.Do(EvalFunc());
}
private CustomParser parser = new CustomParser();
private Func<CommandEventArgs, Task> EvalFunc() => async e =>
{
string expression = e.GetArg("expression")?.Trim();
if (string.IsNullOrWhiteSpace(expression))
{
await e.Channel.SendMessage("Must give expression");
return;
}
string answer = evaluate(expression);
if (answer == null)
{
await e.Channel.SendMessage($"Expression {expression} failed to evaluate");
return;
}
await e.Channel.SendMessage($"`result: {answer}`");
};
private string evaluate(string expression)
{
//check for factorial
expression = Regex.Replace(expression, @"\d+!", x => x.Value + "0");
try
{
string result = parser.Parse(expression).ToString();
return result;
}
catch (OverflowException e)
{
return $"Overflow error on {expression}";
}
catch (FormatException e)
{
return $"\"{expression}\" was not formatted correctly";
}
}
class CustomParser : MathParser
{
public CustomParser() : base()
{
OperatorList.Add("!");
OperatorList.Add("_");
OperatorAction.Add("!", (x, y) => factorial(x));
OperatorAction.Add("_", (x, y) => 10.130M);
}
static decimal factorial(decimal x)
{
decimal y = x-1;
while (y >0)
{
x = x * y--;
}
return x;
}
}
}
}

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@ -28,6 +28,7 @@ namespace NadekoBot.Modules.Searches
commands.Add(new ConverterCommand(this));
commands.Add(new RedditCommand(this));
commands.Add(new WowJokeCommand(this));
commands.Add(new EvalCommand(this));
rng = new Random();
}

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@ -89,6 +89,10 @@
<HintPath>..\packages\Manatee.Trello.WebApi.1.0.1\lib\net45\Manatee.Trello.WebApi.dll</HintPath>
<Private>True</Private>
</Reference>
<Reference Include="MathParser, Version=1.0.10.1, Culture=neutral, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>lib\MathParser.dll</HintPath>
</Reference>
<Reference Include="Newtonsoft.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
<HintPath>..\packages\Newtonsoft.Json.8.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
<Private>True</Private>
@ -128,6 +132,7 @@
<Compile Include="Modules\CustomReactions\CustomReactions.cs" />
<Compile Include="Modules\Programming\Commands\HaskellRepl.cs" />
<Compile Include="Modules\Programming\ProgrammingModule.cs" />
<Compile Include="Modules\Searches\Commands\EvalCommand.cs" />
<Compile Include="Modules\Searches\Commands\IMDB\ImdbMovie.cs" />
<Compile Include="Modules\Searches\Commands\IMDB\ImdbScraper.cs" />
<Compile Include="Classes\IncidentsHandler.cs" />
@ -475,6 +480,7 @@
</ProjectReference>
</ItemGroup>
<ItemGroup>
<Content Include="lib\MathParser.dll" />
<Content Include="lib\ScaredFingers.UnitsConversion.dll" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
@ -485,4 +491,4 @@
<Target Name="AfterBuild">
</Target>
-->
</Project>
</Project>