60 lines
2.2 KiB
C#
60 lines
2.2 KiB
C#
using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading;
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using Discord.Commands;
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using NLua;
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namespace ChaosBot.Services.ProgrammingLanguageInterpreter
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{
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internal class LuaProgrammingLanguageInterpreter : IProgrammingLanguageInterpreter
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{
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private readonly StringBuilder _outputBuilder = new StringBuilder();
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private CancellationToken _ct;
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private Lua _state;
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public string Interpret(CancellationToken ct, SocketCommandContext context, string content, string command)
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{
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LoggingFacade.Debug($"Interpreting code for {command} using Lua");
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LoggingFacade.Trace($"Using CancellationToken: {ct}");
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_ct = ct;
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LoggingFacade.Trace("Starting Lua interpreter");
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_state = new Lua();
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LoggingFacade.Trace("Setting Lua debug hook");
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_state.SetDebugHook(KeraLua.LuaHookMask.Line, 0);
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_state.DebugHook += LuaDebugHook;
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MethodInfo printMethod = GetType().GetMethod("Print", BindingFlags.NonPublic | BindingFlags.Instance);
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LoggingFacade.Info($"Overwriting print function with {printMethod}");
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_state["print"] = _state.RegisterFunction("print", this, printMethod);
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LoggingFacade.Trace("Disabling Lua `import` function");
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_state.DoString ("\nimport = function () end\n");
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LoggingFacade.Trace("Running user Lua code");
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_state.DoString(content, command);
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LoggingFacade.Trace("Returning Lua output");
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return _outputBuilder.ToString();
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}
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private void LuaDebugHook(object sender, NLua.Event.DebugHookEventArgs e)
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{
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if (_ct.IsCancellationRequested)
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{
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Lua l = (Lua) sender;
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l.State.Error("Timeout kill");
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}
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}
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// This is being used in the `Interpret` function to register the print function
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// ReSharper disable once UnusedMember.Local
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private void Print(params object[] parameters)
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{
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string str = string.Join("\t", from param in parameters select param == null ? string.Empty : param.ToString());
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_outputBuilder.AppendLine(str);
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}
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}
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}
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