AutoPatientInfoRecorder/src/AntdUI/Lib/SVG/Painting/SvgPaintServerFactory.cs

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// THIS FILE IS PART OF SVG PROJECT
// THE SVG PROJECT IS AN OPENSOURCE LIBRARY LICENSED UNDER THE MS-PL License.
// COPYRIGHT (C) svg-net. ALL RIGHTS RESERVED.
// GITHUB: https://github.com/svg-net/SVG

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;

namespace AntdUI.Svg
{
    internal class SvgPaintServerConverter
    {
        public static SvgPaintServer Parse(string value, SvgDocument context)
        {
            if (string.Equals(value.Trim(), "none", StringComparison.OrdinalIgnoreCase) || string.IsNullOrEmpty(value) || value.Trim().Length < 1) return SvgPaintServer.None;
            else return Create(value, context);
        }

        public static SvgPaintServer Create(string value, SvgDocument document)
        {
            // If it's pointing to a paint server
            if (string.IsNullOrEmpty(value)) return SvgColourServer.NotSet;
            else if (value == "inherit") return SvgColourServer.Inherit;
            else if (value == "currentColor") return new SvgDeferredPaintServer(document, value);
            else
            {
                var servers = new List<SvgPaintServer>();
                while (!string.IsNullOrEmpty(value))
                {
                    if (value.StartsWith("url(#"))
                    {
                        var leftParen = value.IndexOf(')', 5);
                        Uri id = new Uri(value.Substring(5, leftParen - 5), UriKind.Relative);
                        value = value.Substring(leftParen + 1).Trim();
                        servers.Add((SvgPaintServer)document.IdManager.GetElementById(id));
                    }
                    // If referenced to to a different (linear or radial) gradient
                    else if (document.IdManager.GetElementById(value) != null && document.IdManager.GetElementById(value).GetType().BaseType == typeof(SvgGradientServer))
                    {
                        return (SvgPaintServer)document.IdManager.GetElementById(value);
                    }
                    else if (value.StartsWith("#")) // Otherwise try and parse as colour
                    {
                        switch (CountHexDigits(value, 1))
                        {
                            case 3:
                                servers.Add(new SvgColourServer(ParseColor(value.Substring(0, 4))));
                                value = value.Substring(4).Trim();
                                break;
                            case 6:
                                servers.Add(new SvgColourServer(ParseColor(value.Substring(0, 7))));
                                value = value.Substring(7).Trim();
                                break;
                            default:
                                return new SvgDeferredPaintServer(document, value);
                        }
                    }
                    else return new SvgColourServer(ParseColor(value.Trim()));