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

namespace OpenMetaverse.TestClient
{
    class Parsing
    {
        public static string[] ParseArguments(string str)
        {
            List<string> list = new List<string>();
            string current = String.Empty;
            string trimmed = null;
            bool withinQuote = false;
            bool escaped = false;

            foreach (char c in str)
            {
                if (c == '"')
                {
                    if (escaped)
                    {
                        current += '"';
                        escaped = false;
                    }
                    else
                    {
                        current += '"';
                        withinQuote = !withinQuote;
                    }
                }
                else if (c == ' ' || c == '\t')
                {
                    if (escaped || withinQuote)
                    {
                        current += c;
                        escaped = false;
                    }
                    else
                    {
                        trimmed = current.Trim();
                        if (trimmed.StartsWith("\"") && trimmed.EndsWith("\""))
                        {
                            trimmed = trimmed.Remove(0, 1);
                            trimmed = trimmed.Remove(trimmed.Length - 1);
                            trimmed = trimmed.Trim();
                        }
                        if (trimmed.Length > 0)
                            list.Add(trimmed);
                        current = String.Empty;
                    }
                }
                else if (c == '\\')
                {
                    if (escaped)
                    {
                        current += '\\';
                        escaped = false;
                    }
                    else
                    {
                        escaped = true;
                    }
                }
                else
                {
                    if (escaped)
                        throw new FormatException(c.ToString() + " is not an escapable character.");
                    current += c;
                }
            }

            trimmed = current.Trim();

            if (trimmed.StartsWith("\"") && trimmed.EndsWith("\""))
            {
                trimmed = trimmed.Remove(0, 1);
                trimmed = trimmed.Remove(trimmed.Length - 1);
                trimmed = trimmed.Trim();
            }

            if (trimmed.Length > 0)
                list.Add(trimmed);

            return list.ToArray();
        }
    }
}