TweetDuck/lib/TweetLib.Core/Collections/CommandLineArgs.cs

using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;

namespace TweetLib.Core.Collections{
    public sealed class CommandLineArgs{
        public static CommandLineArgs FromStringArray(char entryChar, string[] array){
            CommandLineArgs args = new CommandLineArgs();
            ReadStringArray(entryChar, array, args);
            return args;
        }

        public static void ReadStringArray(char entryChar, string[] array, CommandLineArgs targetArgs){
            for(int index = 0; index < array.Length; index++){
                string entry = array[index];

                if (entry.Length > 0 && entry[0] == entryChar){
                    if (index < array.Length - 1){
                        string potentialValue = array[index+1];

                        if (potentialValue.Length > 0 && potentialValue[0] == entryChar){
                            targetArgs.AddFlag(entry);
                        }
                        else{
                            targetArgs.SetValue(entry, potentialValue);
                            ++index;
                        }
                    }
                    else{
                        targetArgs.AddFlag(entry);
                    }
                }
            }
        }

        public static CommandLineArgs ReadCefArguments(string argumentString){
            CommandLineArgs args = new CommandLineArgs();

            if (string.IsNullOrWhiteSpace(argumentString)){
                return args;
            }
            
            foreach(Match match in Regex.Matches(argumentString, @"([^=\s]+(?:=(?:\S*""[^""]*?""\S*|\S*))?)")){
                string matchValue = match.Value;

                int indexEquals = matchValue.IndexOf('=');
                string key, value;

                if (indexEquals == -1){
                    key = matchValue.TrimStart('-');
                    value = "1";
                }
                else{
                    key = matchValue.Substring(0, indexEquals).TrimStart('-');
                    value = matchValue.Substring(indexEquals + 1).Trim('"');
                }

                if (key.Length != 0){
                    args.SetValue(key, value);
                }
            }

            return args;
        }

        private readonly HashSet<string> flags = new HashSet<string>();
        private readonly Dictionary<string, string> values = new Dictionary<string, string>();

        public int Count => flags.Count + values.Count;

        public void AddFlag(string flag){
            flags.Add(flag.ToLower());
        }

        public bool HasFlag(string flag){
            return flags.Contains(flag.ToLower());
        }

        public void RemoveFlag(string flag){
            flags.Remove(flag.ToLower());
        }

        public void SetValue(string key, string value){
            values[key.ToLower()] = value;
        }

        public string? GetValue(string key){
            return values.TryGetValue(key.ToLower(), out string val) ? val : null;
        }

        public void RemoveValue(string key){
            values.Remove(key.ToLower());
        }

        public CommandLineArgs Clone(){
            CommandLineArgs copy = new CommandLineArgs();

            foreach(string flag in flags){
                copy.AddFlag(flag);
            }

            foreach(var kvp in values){
                copy.SetValue(kvp.Key, kvp.Value);
            }

            return copy;
        }

        public void ToDictionary(IDictionary<string, string> target){
            foreach(string flag in flags){
                target[flag] = "1";
            }

            foreach(var kvp in values){
                target[kvp.Key] = kvp.Value;
            }
        }

        public override string ToString(){
            StringBuilder build = new StringBuilder();

            foreach(string flag in flags){
                build.Append(flag).Append(' ');
            }

            foreach(var kvp in values){
                build.Append(kvp.Key).Append(" \"").Append(kvp.Value).Append("\" ");
            }

            return build.Length == 0 ? string.Empty : build.Remove(build.Length - 1, 1).ToString();
        }
    }
}