// Supported inputs
// HEX #rgb, #argb, #rrggbb, #aarrggbb
// RGB rgb(255,0,0), rgb(100%,0%,0%) values in range 0-255 or 0%-100%
// RGBA rgba(255, 0, 0, 0.8), rgba(100%, 0%, 0%, 0.8) opacity is 0.0-1.0
// HSL hsl(120, 100%, 50%) h is 0-360, s and l are 0%-100%
// HSLA hsla(120, 100%, 50%, .8) opacity is 0.0-1.0
// Predefined color case insensitive
public override object ConvertFromInvariantString(string value)
{
if (value != null)
{
value = value.Trim();
if (value.StartsWith("#", StringComparison.Ordinal))
{
return(Color.FromHex(value));
}
if (value.StartsWith("rgba", StringComparison.OrdinalIgnoreCase))
{
var op = value.IndexOf('(');
var cp = value.LastIndexOf(')');
if (op < 0 || cp < 0 || cp < op)
{
throw new InvalidOperationException($"Cannot convert \"{value}\" into {typeof(Color)}");
}
var quad = value.Substring(op + 1, cp - op - 1).Split(',');
if (quad.Length != 4)
{
throw new InvalidOperationException($"Cannot convert \"{value}\" into {typeof(Color)}");
}
var r = ParseColorValue(quad[0], 255, acceptPercent: true);
var g = ParseColorValue(quad[1], 255, acceptPercent: true);
var b = ParseColorValue(quad[2], 255, acceptPercent: true);
var a = ParseOpacity(quad[3]);
return(new Color(r, g, b, a));
}
if (value.StartsWith("rgb", StringComparison.OrdinalIgnoreCase))
{
var op = value.IndexOf('(');
var cp = value.LastIndexOf(')');
if (op < 0 || cp < 0 || cp < op)
{
throw new InvalidOperationException($"Cannot convert \"{value}\" into {typeof(Color)}");
}
var triplet = value.Substring(op + 1, cp - op - 1).Split(',');
if (triplet.Length != 3)
{
throw new InvalidOperationException($"Cannot convert \"{value}\" into {typeof(Color)}");
}
var r = ParseColorValue(triplet[0], 255, acceptPercent: true);
var g = ParseColorValue(triplet[1], 255, acceptPercent: true);
var b = ParseColorValue(triplet[2], 255, acceptPercent: true);
return(new Color(r, g, b));
}
if (value.StartsWith("hsla", StringComparison.OrdinalIgnoreCase))
{
var op = value.IndexOf('(');
var cp = value.LastIndexOf(')');
if (op < 0 || cp < 0 || cp < op)
{
throw new InvalidOperationException($"Cannot convert \"{value}\" into {typeof(Color)}");
}
var quad = value.Substring(op + 1, cp - op - 1).Split(',');
if (quad.Length != 4)
{
throw new InvalidOperationException($"Cannot convert \"{value}\" into {typeof(Color)}");
}
var h = ParseColorValue(quad[0], 360, acceptPercent: false);
var s = ParseColorValue(quad[1], 100, acceptPercent: true);
var l = ParseColorValue(quad[2], 100, acceptPercent: true);
var a = ParseOpacity(quad[3]);
return(Color.FromHsla(h, s, l, a));
}
if (value.StartsWith("hsl", StringComparison.OrdinalIgnoreCase))
{
var op = value.IndexOf('(');
var cp = value.LastIndexOf(')');
if (op < 0 || cp < 0 || cp < op)
{
throw new InvalidOperationException($"Cannot convert \"{value}\" into {typeof(Color)}");
}
var triplet = value.Substring(op + 1, cp - op - 1).Split(',');
if (triplet.Length != 3)
{
throw new InvalidOperationException($"Cannot convert \"{value}\" into {typeof(Color)}");
}
var h = ParseColorValue(triplet[0], 360, acceptPercent: false);
var s = ParseColorValue(triplet[1], 100, acceptPercent: true);
var l = ParseColorValue(triplet[2], 100, acceptPercent: true);
return(Color.FromHsla(h, s, l));
}
string[] parts = value.Split('.');
if (parts.Length == 1 || (parts.Length == 2 && parts[0] == "Color"))
{
string color = parts[parts.Length - 1];
switch (color.ToLowerInvariant())
{
case "default": return(Color.Default);
case "accent": return(Color.Accent);
case "aliceblue": return(Color.AliceBlue);
case "antiquewhite": return(Color.AntiqueWhite);
case "aqua": return(Color.Aqua);
case "aquamarine": return(Color.Aquamarine);
case "azure": return(Color.Azure);
case "beige": return(Color.Beige);
case "bisque": return(Color.Bisque);
case "black": return(Color.Black);
case "blanchedalmond": return(Color.BlanchedAlmond);
case "blue": return(Color.Blue);
case "blueViolet": return(Color.BlueViolet);
case "brown": return(Color.Brown);
case "burlywood": return(Color.BurlyWood);
case "cadetblue": return(Color.CadetBlue);
case "chartreuse": return(Color.Chartreuse);
case "chocolate": return(Color.Chocolate);
case "coral": return(Color.Coral);
case "cornflowerblue": return(Color.CornflowerBlue);
case "cornsilk": return(Color.Cornsilk);
case "crimson": return(Color.Crimson);
case "cyan": return(Color.Cyan);
case "darkblue": return(Color.DarkBlue);
case "darkcyan": return(Color.DarkCyan);
case "darkgoldenrod": return(Color.DarkGoldenrod);
case "darkgray": return(Color.DarkGray);
case "darkgreen": return(Color.DarkGreen);
case "darkkhaki": return(Color.DarkKhaki);
case "darkmagenta": return(Color.DarkMagenta);
case "darkolivegreen": return(Color.DarkOliveGreen);
case "darkorange": return(Color.DarkOrange);
case "darkorchid": return(Color.DarkOrchid);
case "darkred": return(Color.DarkRed);
case "darksalmon": return(Color.DarkSalmon);
case "darkseagreen": return(Color.DarkSeaGreen);
case "darkslateblue": return(Color.DarkSlateBlue);
case "darkslategray": return(Color.DarkSlateGray);
case "darkturquoise": return(Color.DarkTurquoise);
case "darkviolet": return(Color.DarkViolet);
case "deeppink": return(Color.DeepPink);
case "deepskyblue": return(Color.DeepSkyBlue);
case "dimgray": return(Color.DimGray);
case "dodgerblue": return(Color.DodgerBlue);
case "firebrick": return(Color.Firebrick);
case "floralwhite": return(Color.FloralWhite);
case "forestgreen": return(Color.ForestGreen);
case "fuchsia": return(Color.Fuchsia);
case "gainsboro": return(Color.Gainsboro);
case "ghostwhite": return(Color.GhostWhite);
case "gold": return(Color.Gold);
case "goldenrod": return(Color.Goldenrod);
case "gray": return(Color.Gray);
case "green": return(Color.Green);
case "greenyellow": return(Color.GreenYellow);
case "honeydew": return(Color.Honeydew);
case "hotpink": return(Color.HotPink);
case "indianred": return(Color.IndianRed);
case "indigo": return(Color.Indigo);
case "ivory": return(Color.Ivory);
case "khaki": return(Color.Khaki);
case "lavender": return(Color.Lavender);
case "lavenderblush": return(Color.LavenderBlush);
case "lawngreen": return(Color.LawnGreen);
case "lemonchiffon": return(Color.LemonChiffon);
case "lightblue": return(Color.LightBlue);
case "lightcoral": return(Color.LightCoral);
case "lightcyan": return(Color.LightCyan);
case "lightgoldenrodyellow": return(Color.LightGoldenrodYellow);
case "lightgray": return(Color.LightGray);
case "lightgreen": return(Color.LightGreen);
case "lightpink": return(Color.LightPink);
case "lightsalmon": return(Color.LightSalmon);
case "lightseagreen": return(Color.LightSeaGreen);
case "lightskyblue": return(Color.LightSkyBlue);
case "lightslategray": return(Color.LightSlateGray);
case "lightsteelblue": return(Color.LightSteelBlue);
case "lightyellow": return(Color.LightYellow);
case "lime": return(Color.Lime);
case "limegreen": return(Color.LimeGreen);
case "linen": return(Color.Linen);
case "magenta": return(Color.Magenta);
case "maroon": return(Color.Maroon);
case "mediumaquamarine": return(Color.MediumAquamarine);
case "mediumblue": return(Color.MediumBlue);
case "mediumorchid": return(Color.MediumOrchid);
case "mediumpurple": return(Color.MediumPurple);
case "mediumseagreen": return(Color.MediumSeaGreen);
case "mediumslateblue": return(Color.MediumSlateBlue);
case "mediumspringgreen": return(Color.MediumSpringGreen);
case "mediumturquoise": return(Color.MediumTurquoise);
case "mediumvioletred": return(Color.MediumVioletRed);
case "midnightblue": return(Color.MidnightBlue);
case "mintcream": return(Color.MintCream);
case "mistyrose": return(Color.MistyRose);
case "moccasin": return(Color.Moccasin);
case "navajowhite": return(Color.NavajoWhite);
case "navy": return(Color.Navy);
case "oldlace": return(Color.OldLace);
case "olive": return(Color.Olive);
case "olivedrab": return(Color.OliveDrab);
case "orange": return(Color.Orange);
case "orangered": return(Color.OrangeRed);
case "orchid": return(Color.Orchid);
case "palegoldenrod": return(Color.PaleGoldenrod);
case "palegreen": return(Color.PaleGreen);
case "paleturquoise": return(Color.PaleTurquoise);
case "palevioletred": return(Color.PaleVioletRed);
case "papayawhip": return(Color.PapayaWhip);
case "peachpuff": return(Color.PeachPuff);
case "peru": return(Color.Peru);
case "pink": return(Color.Pink);
case "plum": return(Color.Plum);
case "powderblue": return(Color.PowderBlue);
case "purple": return(Color.Purple);
case "red": return(Color.Red);
case "rosybrown": return(Color.RosyBrown);
case "royalblue": return(Color.RoyalBlue);
case "saddlebrown": return(Color.SaddleBrown);
case "salmon": return(Color.Salmon);
case "sandybrown": return(Color.SandyBrown);
case "seagreen": return(Color.SeaGreen);
case "seashell": return(Color.SeaShell);
case "sienna": return(Color.Sienna);
case "silver": return(Color.Silver);
case "skyblue": return(Color.SkyBlue);
case "slateblue": return(Color.SlateBlue);
case "slategray": return(Color.SlateGray);
case "snow": return(Color.Snow);
case "springgreen": return(Color.SpringGreen);
case "steelblue": return(Color.SteelBlue);
case "tan": return(Color.Tan);
case "teal": return(Color.Teal);
case "thistle": return(Color.Thistle);
case "tomato": return(Color.Tomato);
case "transparent": return(Color.Transparent);
case "turquoise": return(Color.Turquoise);
case "violet": return(Color.Violet);
case "wheat": return(Color.Wheat);
case "white": return(Color.White);
case "whitesmoke": return(Color.WhiteSmoke);
case "yellow": return(Color.Yellow);
case "yellowgreen": return(Color.YellowGreen);
}
var field = typeof(Color).GetFields().FirstOrDefault(fi => fi.IsStatic && string.Equals(fi.Name, color, StringComparison.OrdinalIgnoreCase));
if (field != null)
{
return((Color)field.GetValue(null));
}
var property = typeof(Color).GetProperties().FirstOrDefault(pi => string.Equals(pi.Name, color, StringComparison.OrdinalIgnoreCase) && pi.CanRead && pi.GetMethod.IsStatic);
if (property != null)
{
return((Color)property.GetValue(null, null));
}
}
}
throw new InvalidOperationException($"Cannot convert \"{value}\" into {typeof(Color)}");
}
