/// <summary>
/// Parses a color string.
/// </summary>
/// <param name="s">The color string.</param>
/// <param name="color">The parsed color</param>
/// <returns>The status of the operation.</returns>
public static bool TryParse(string s, out Color color)
{
if (s == null)
{
throw new ArgumentNullException(nameof(s));
}
if (s.Length == 0)
{
throw new FormatException();
}
if (s[0] == '#' && TryParseInternal(s.AsSpan(), out color))
{
return(true);
}
var knownColor = KnownColors.GetKnownColor(s);
if (knownColor != KnownColor.None)
{
color = knownColor.ToColor();
return(true);
}
color = default;
return(false);
}
/// <summary>
/// Parses a color string.
/// </summary>
/// <param name="s">The color string.</param>
/// <param name="color">The parsed color</param>
/// <returns>The status of the operation.</returns>
public static bool TryParse(string s, out Color color)
{
color = default;
if (s is null)
{
return(false);
}
if (s.Length == 0)
{
return(false);
}
if (s[0] == '#' &&
TryParseHexFormat(s.AsSpan(), out color))
{
return(true);
}
if (s.Length > 5 &&
(s[0] == 'r' || s[0] == 'R') &&
(s[1] == 'g' || s[1] == 'G') &&
(s[2] == 'b' || s[2] == 'B') &&
TryParseCssFormat(s, out color))
{
return(true);
}
if (s.Length > 5 &&
(s[0] == 'h' || s[0] == 'H') &&
(s[1] == 's' || s[1] == 'S') &&
(s[2] == 'l' || s[2] == 'L') &&
HslColor.TryParse(s, out HslColor hslColor))
{
color = hslColor.ToRgb();
return(true);
}
if (s.Length > 5 &&
(s[0] == 'h' || s[0] == 'H') &&
(s[1] == 's' || s[1] == 'S') &&
(s[2] == 'v' || s[2] == 'V') &&
HsvColor.TryParse(s, out HsvColor hsvColor))
{
color = hsvColor.ToRgb();
return(true);
}
var knownColor = KnownColors.GetKnownColor(s);
if (knownColor != KnownColor.None)
{
color = knownColor.ToColor();
return(true);
}
return(false);
}
/// <summary>
/// Parses a color string.
/// </summary>
/// <param name="s">The color string.</param>
/// <param name="color">The parsed color</param>
/// <returns>The status of the operation.</returns>
public static bool TryParse(ReadOnlySpan <char> s, out Color color)
{
if (s.Length == 0)
{
color = default;
return(false);
}
if (s[0] == '#' &&
TryParseHexFormat(s, out color))
{
return(true);
}
// At this point all parsing uses strings
var str = s.ToString();
if (s.Length > 5 &&
(s[0] == 'r' || s[0] == 'R') &&
(s[1] == 'g' || s[1] == 'G') &&
(s[2] == 'b' || s[2] == 'B') &&
TryParseCssFormat(str, out color))
{
return(true);
}
if (s.Length > 5 &&
(s[0] == 'h' || s[0] == 'H') &&
(s[1] == 's' || s[1] == 'S') &&
(s[2] == 'l' || s[2] == 'L') &&
HslColor.TryParse(str, out HslColor hslColor))
{
color = hslColor.ToRgb();
return(true);
}
if (s.Length > 5 &&
(s[0] == 'h' || s[0] == 'H') &&
(s[1] == 's' || s[1] == 'S') &&
(s[2] == 'v' || s[2] == 'V') &&
HsvColor.TryParse(str, out HsvColor hsvColor))
{
color = hsvColor.ToRgb();
return(true);
}
var knownColor = KnownColors.GetKnownColor(str);
if (knownColor != KnownColor.None)
{
color = knownColor.ToColor();
return(true);
}
color = default;
return(false);
}
/// <summary>
/// Parses a brush string.
/// </summary>
/// <param name="s">The brush string.</param>
/// <returns>The <see cref="Color"/>.</returns>
public static IBrush Parse(string s)
{
Contract.Requires <ArgumentNullException>(s != null);
Contract.Requires <FormatException>(s.Length > 0);
if (s[0] == '#')
{
return(new ImmutableSolidColorBrush(Color.Parse(s)));
}
var brush = KnownColors.GetKnownBrush(s);
if (brush != null)
{
return(brush);
}
throw new FormatException($"Invalid brush string: '{s}'.");
}
/// <summary>
/// Parses a color string.
/// </summary>
/// <param name="s">The color string.</param>
/// <param name="color">The parsed color</param>
/// <returns>The status of the operation.</returns>
public static bool TryParse(ReadOnlySpan <char> s, out Color color)
{
color = default;
if (s == null)
{
return(false);
}
if (s.Length == 0)
{
return(false);
}
if (s[0] == '#')
{
var or = 0u;
if (s.Length == 7)
{
or = 0xff000000;
}
else if (s.Length != 9)
{
return(false);
}
if (!uint.TryParse(s.Slice(1).ToString(), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var parsed))
{
return(false);
}
color = FromUInt32(parsed | or);
return(true);
}
var knownColor = KnownColors.GetKnownColor(s.ToString());
if (knownColor != KnownColor.None)
{
color = knownColor.ToColor();
return(true);
}
return(false);
}
/// <summary>
/// Parses a brush string.
/// </summary>
/// <param name="s">The brush string.</param>
/// <returns>The <see cref="Color"/>.</returns>
public static IBrush Parse(string s)
{
_ = s ?? throw new ArgumentNullException(nameof(s));
if (s.Length > 0)
{
if (s[0] == '#')
{
return(new ImmutableSolidColorBrush(Color.Parse(s)));
}
var brush = KnownColors.GetKnownBrush(s);
if (brush != null)
{
return(brush);
}
}
throw new FormatException($"Invalid brush string: '{s}'.");
}
/// <summary>
/// Parses a color string.
/// </summary>
/// <param name="s">The color string.</param>
/// <returns>The <see cref="Color"/>.</returns>
public static Color Parse(string s)
{
if (s == null)
{
throw new ArgumentNullException(nameof(s));
}
if (s.Length == 0)
{
throw new FormatException();
}
if (s[0] == '#')
{
var or = 0u;
if (s.Length == 7)
{
or = 0xff000000;
}
else if (s.Length != 9)
{
throw new FormatException($"Invalid color string: '{s}'.");
}
return(FromUInt32(uint.Parse(s.Substring(1), NumberStyles.HexNumber, CultureInfo.InvariantCulture) | or));
}
var knownColor = KnownColors.GetKnownColor(s);
if (knownColor != KnownColor.None)
{
return(knownColor.ToColor());
}
throw new FormatException($"Invalid color string: '{s}'.");
}
/// <summary>
/// Returns the string representation of the color.
/// </summary>
/// <returns>
/// The string representation of the color.
/// </returns>
public override string ToString()
{
uint rgb = ToUint32();
return(KnownColors.GetKnownColorName(rgb) ?? $"#{rgb:x8}");
}
/// <summary>
/// Parses a color string.
/// </summary>
/// <param name="s">The color string.</param>
/// <param name="color">The parsed color</param>
/// <returns>The status of the operation.</returns>
public static bool TryParse(ReadOnlySpan <char> s, out Color color)
{
if (s.Length == 0)
{
color = default;
return(false);
}
if (s[0] == '#' &&
TryParseHexFormat(s, out color))
{
return(true);
}
// At this point all parsing uses strings
var str = s.ToString();
// Note: The length checks are also an important optimization.
// The shortest possible CSS format is "rbg(0,0,0)", Length = 10.
if (s.Length >= 10 &&
(s[0] == 'r' || s[0] == 'R') &&
(s[1] == 'g' || s[1] == 'G') &&
(s[2] == 'b' || s[2] == 'B') &&
TryParseCssFormat(str, out color))
{
return(true);
}
if (s.Length >= 10 &&
(s[0] == 'h' || s[0] == 'H') &&
(s[1] == 's' || s[1] == 'S') &&
(s[2] == 'l' || s[2] == 'L') &&
HslColor.TryParse(str, out HslColor hslColor))
{
color = hslColor.ToRgb();
return(true);
}
if (s.Length >= 10 &&
(s[0] == 'h' || s[0] == 'H') &&
(s[1] == 's' || s[1] == 'S') &&
(s[2] == 'v' || s[2] == 'V') &&
HsvColor.TryParse(str, out HsvColor hsvColor))
{
color = hsvColor.ToRgb();
return(true);
}
var knownColor = KnownColors.GetKnownColor(str);
if (knownColor != KnownColor.None)
{
color = knownColor.ToColor();
return(true);
}
color = default;
return(false);
}
/// <summary>
/// Parses a color string.
/// </summary>
/// <param name="s">The color string.</param>
/// <param name="color">The parsed color</param>
/// <returns>The status of the operation.</returns>
public static bool TryParse(string s, out Color color)
{
color = default;
if (s is null)
{
return(false);
}
if (s.Length == 0)
{
return(false);
}
if (s[0] == '#' &&
TryParseHexFormat(s.AsSpan(), out color))
{
return(true);
}
// Note: The length checks are also an important optimization.
// The shortest possible CSS format is "rbg(0,0,0)", Length = 10.
if (s.Length >= 10 &&
(s[0] == 'r' || s[0] == 'R') &&
(s[1] == 'g' || s[1] == 'G') &&
(s[2] == 'b' || s[2] == 'B') &&
TryParseCssFormat(s, out color))
{
return(true);
}
if (s.Length >= 10 &&
(s[0] == 'h' || s[0] == 'H') &&
(s[1] == 's' || s[1] == 'S') &&
(s[2] == 'l' || s[2] == 'L') &&
HslColor.TryParse(s, out HslColor hslColor))
{
color = hslColor.ToRgb();
return(true);
}
if (s.Length >= 10 &&
(s[0] == 'h' || s[0] == 'H') &&
(s[1] == 's' || s[1] == 'S') &&
(s[2] == 'v' || s[2] == 'V') &&
HsvColor.TryParse(s, out HsvColor hsvColor))
{
color = hsvColor.ToRgb();
return(true);
}
var knownColor = KnownColors.GetKnownColor(s);
if (knownColor != KnownColor.None)
{
color = knownColor.ToColor();
return(true);
}
return(false);
}
