PowerToys/Plugins/Wox.Plugin.Calculator/Main.cs

using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text.RegularExpressions;
using System.Windows;
using Mages;
using Mages.Core;

namespace Wox.Plugin.Caculator
{
    public class Main : IPlugin, IPluginI18n
    {
        private static Regex regValidExpressChar = new Regex(
                        @"^(" +
                        @"ceil|floor|exp|pi|e|max|min|det|abs|log|ln|sqrt|" +
                        @"sin|cos|tan|arcsin|arccos|arctan|" +
                        @"eigval|eigvec|eig|sum|polar|plot|round|sort|real|zeta|" +
                        @"bin2dec|hex2dec|oct2dec|" +
                        @"==|~=|&&|\|\||" +
                        @"[ei]|[0-9]|[\+\-\*\/\^\., ""]|[\(\)\|\!\[\]]" +
                        @")+$", RegexOptions.Compiled);
        private static Regex regBrackets = new Regex(@"[\(\)\[\]]", RegexOptions.Compiled);
        private static Mages.Core.Engine magesEngine;
        private PluginInitContext context { get; set; }

        static Main()
        {
            magesEngine = new Engine();
        }

        public List<Result> Query(Query query)
        {
            if (query.Search.Length <= 2          // don't affect when user only input "e" or "i" keyword
                || !regValidExpressChar.IsMatch(query.Search)
                || !IsBracketComplete(query.Search)) return new List<Result>();

            try
            {
                var result = magesEngine.Interpret(query.Search);

                if (result.ToString() == "NaN")
                    result = context.API.GetTranslation("wox_plugin_calculator_not_a_number");

                if (result is Function)
                    result = context.API.GetTranslation("wox_plugin_calculator_expression_not_complete");


                if (result != null && !string.IsNullOrEmpty(result.ToString()))
                {
                    return new List<Result>
                    { new Result
                    {
                        Title = result.ToString(),
                        IcoPath = "Images/calculator.png",
                        Score = 300,
                        SubTitle = context.API.GetTranslation("wox_plugin_calculator_copy_number_to_clipboard"),
                        Action = c =>
                        {
                            try
                            {
                                Clipboard.SetText(result.ToString());
                                return true;
                            }
                            catch (ExternalException e)
                            {
                                MessageBox.Show("Copy failed, please try later");
                                return false;
                            }
                        }
                    } };
                }
            }
            catch
            { }

            return new List<Result>();
        }

        private bool IsBracketComplete(string query)
        {
            var matchs = regBrackets.Matches(query);
            var leftBracketCount = 0;
            foreach (Match match in matchs)
            {
                if (match.Value == "(" || match.Value == "[")
                {
                    leftBracketCount++;
                }
                else
                {
                    leftBracketCount--;
                }
            }

            return leftBracketCount == 0;
        }

        public void Init(PluginInitContext context)
        {
            this.context = context;
        }

        public string GetTranslatedPluginTitle()
        {
            return context.API.GetTranslation("wox_plugin_caculator_plugin_name");
        }

        public string GetTranslatedPluginDescription()
        {
            return context.API.GetTranslation("wox_plugin_caculator_plugin_description");
        }
    }
}