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Fixes #4000. Named colors as enums. #4005

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Merged
merged 16 commits into from
Mar 29, 2025
Merged

Fixes #4000. Named colors as enums. #4005

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fe30bd0
Add W3C color enum with the RGB as numeric value
TheTonttu Mar 19, 2025
6d64a9f
Add transform helper class for W3cColor enum
TheTonttu Mar 22, 2025
d81495b
IColorNameResolver enable null analysis
TheTonttu Mar 22, 2025
7ba196e
Remove obsolete color name related ResourceManagerTests
TheTonttu Mar 23, 2025
cb109f3
Replace remains of W3CColors with direct W3C color name resolver
TheTonttu Mar 23, 2025
7fac661
Add ANSI 4-bit (ColorName16) color name resolver
TheTonttu Mar 23, 2025
75d1f49
Add multi-standard color name resolver
TheTonttu Mar 24, 2025
f314928
Split conditional name resolver test cases
TheTonttu Mar 24, 2025
a2d40f3
Change W3C colors tests to be similar to name resolvers
TheTonttu Mar 25, 2025
5515326
Change W3cColorsTests to W3cColorNameResolverTests
TheTonttu Mar 25, 2025
22e608a
Make W3cColors internal
TheTonttu Mar 25, 2025
0bf3466
W3cColors: Use Color.Argb instead of individual RGB components
TheTonttu Mar 25, 2025
20977cd
MultiStandardColorNameResolver: Substitute instead of blocking altern…
TheTonttu Mar 27, 2025
a929229
Remove leftover color string resources
TheTonttu Mar 28, 2025
69ffcf5
Consistent position for IColorNameResolver #nullable enable directive
TheTonttu Mar 28, 2025
1a4b32f
Add missing XML comments to ColorScheme.Colors.cs
TheTonttu Mar 29, 2025
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7 changes: 2 additions & 5 deletions Terminal.Gui/Configuration/ColorJsonConverter.cs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
using System.Text.Json;
using System.Text.Json.Serialization;
using ColorHelper;

namespace Terminal.Gui;

Expand Down Expand Up @@ -40,11 +39,9 @@ public override Color Read (ref Utf8JsonReader reader, Type typeToConvert, JsonS
// Get the color string
ReadOnlySpan<char> colorString = reader.GetString ();

// Check if the color string is a color name
if (ColorStrings.TryParseW3CColorName (colorString.ToString (), out Color color1))
if (ColorStrings.TryParseNamedColor (colorString, out Color namedColor))
{
// Return the parsed color
return new (color1);
return namedColor;
}

if (Color.TryParse (colorString, null, out Color parsedColor))
Expand Down
70 changes: 70 additions & 0 deletions Terminal.Gui/Drawing/Color/AnsiColorNameResolver.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,70 @@
#nullable enable

using System.Collections.Immutable;
using System.Diagnostics.CodeAnalysis;

namespace Terminal.Gui;

/// <summary>
/// Color name resolver for <see cref="ColorName16"/>.
/// </summary>
public class AnsiColorNameResolver : IColorNameResolver
{
private static readonly ImmutableArray<string> AnsiColorNames = ImmutableArray.Create(Enum.GetNames<ColorName16>());

/// <inheritdoc/>
public IEnumerable<string> GetColorNames ()
{
return AnsiColorNames;
}

/// <inheritdoc/>
public bool TryNameColor (Color color, [NotNullWhen (true)] out string? name)
{
if (Color.TryGetExactNamedColor16 (color, out ColorName16 colorName16))
{
name = Color16Name (colorName16);
return true;
}
name = null;
return false;
}

/// <inheritdoc/>
public bool TryParseColor (ReadOnlySpan<char> name, out Color color)
{
if (Enum.TryParse (name, ignoreCase: true, out ColorName16 colorName16) &&
// Any numerical value converts to undefined enum value.
Enum.IsDefined (colorName16))
{
color = new Color (colorName16);
return true;
}
color = default;
return false;
}

private static string Color16Name (ColorName16 color16)
{
return color16 switch
{
ColorName16.Black => nameof (ColorName16.Black),
ColorName16.Blue => nameof (ColorName16.Blue),
ColorName16.Green => nameof (ColorName16.Green),
ColorName16.Cyan => nameof (ColorName16.Cyan),
ColorName16.Red => nameof (ColorName16.Red),
ColorName16.Magenta => nameof (ColorName16.Magenta),
ColorName16.Yellow => nameof (ColorName16.Yellow),
ColorName16.Gray => nameof (ColorName16.Gray),
ColorName16.DarkGray => nameof (ColorName16.DarkGray),
ColorName16.BrightBlue => nameof (ColorName16.BrightBlue),
ColorName16.BrightGreen => nameof (ColorName16.BrightGreen),
ColorName16.BrightCyan => nameof (ColorName16.BrightCyan),
ColorName16.BrightRed => nameof (ColorName16.BrightRed),
ColorName16.BrightMagenta => nameof (ColorName16.BrightMagenta),
ColorName16.BrightYellow => nameof (ColorName16.BrightYellow),
ColorName16.White => nameof (ColorName16.White),
_ => throw new NotSupportedException ($"ColorName16 '{color16}' is not supported.")
};
}
}
148 changes: 67 additions & 81 deletions Terminal.Gui/Drawing/Color/Color.Formatting.cs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
#nullable enable
using System.Diagnostics.CodeAnalysis;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.Runtime.CompilerServices;

Expand Down Expand Up @@ -267,90 +266,79 @@ public static Color Parse (ReadOnlySpan<char> text, IFormatProvider? formatProvi
return text switch
{
// Null string or empty span provided
{ IsEmpty: true } when formatProvider is null => throw new ColorParseException (
in text,
"The text provided was null or empty.",
in text
),
{ IsEmpty: true } when formatProvider is null =>
throw new ColorParseException (in text, "The text provided was null or empty.", in text),

// A valid ICustomColorFormatter was specified and the text wasn't null or empty
{ IsEmpty: false } when formatProvider is ICustomColorFormatter f => f.Parse (text),

// Input string is only whitespace
{ Length: > 0 } when text.IsWhiteSpace () => throw new ColorParseException (
in text,
"The text provided consisted of only whitespace characters.",
in text
),
{ Length: > 0 } when text.IsWhiteSpace () =>
throw new ColorParseException (in text, "The text provided consisted of only whitespace characters.", in text),

// Any string too short to possibly be any supported format.
{ Length: > 0 and < 3 } => throw new ColorParseException (
in text,
"Text was too short to be any possible supported format.",
in text
),

// The various hexadecimal cases
['#', ..] hexString => hexString switch
{
// #RGB
['#', var rChar, var gChar, var bChar] chars when chars [1..]
.IsAllAsciiHexDigits () =>
new Color (
byte.Parse ([rChar, rChar], NumberStyles.HexNumber),
byte.Parse ([gChar, gChar], NumberStyles.HexNumber),
byte.Parse ([bChar, bChar], NumberStyles.HexNumber)
),

// #ARGB
['#', var aChar, var rChar, var gChar, var bChar] chars when chars [1..]
.IsAllAsciiHexDigits () =>
new Color (
byte.Parse ([rChar, rChar], NumberStyles.HexNumber),
byte.Parse ([gChar, gChar], NumberStyles.HexNumber),
byte.Parse ([bChar, bChar], NumberStyles.HexNumber),
byte.Parse ([aChar, aChar], NumberStyles.HexNumber)
),

// #RRGGBB
[
'#', var r1Char, var r2Char, var g1Char, var g2Char, var b1Char,
var b2Char
] chars when chars [1..].IsAllAsciiHexDigits () =>
new Color (
byte.Parse ([r1Char, r2Char], NumberStyles.HexNumber),
byte.Parse ([g1Char, g2Char], NumberStyles.HexNumber),
byte.Parse ([b1Char, b2Char], NumberStyles.HexNumber)
),

// #AARRGGBB
[
'#', var a1Char, var a2Char, var r1Char, var r2Char, var g1Char,
var g2Char, var b1Char, var b2Char
] chars when chars [1..].IsAllAsciiHexDigits () =>
new Color (
byte.Parse ([r1Char, r2Char], NumberStyles.HexNumber),
byte.Parse ([g1Char, g2Char], NumberStyles.HexNumber),
byte.Parse ([b1Char, b2Char], NumberStyles.HexNumber),
byte.Parse ([a1Char, a2Char], NumberStyles.HexNumber)
),
_ => throw new ColorParseException (
in hexString,
$"Color hex string {hexString} was not in a supported format",
in hexString
)
},

// rgb(r,g,b) or rgb(r,g,b,a)
['r', 'g', 'b', '(', .., ')'] => ParseRgbaFormat (in text, 4),

// rgba(r,g,b,a) or rgba(r,g,b)
['r', 'g', 'b', 'a', '(', .., ')'] => ParseRgbaFormat (in text, 5),

// Attempt to parse as a named color from the ColorStrings resources
{ } when char.IsLetter (text [0]) && ColorStrings.TryParseW3CColorName (text.ToString (), out Color color) =>
new Color (color),
{ Length: > 0 and < 3 } =>
throw new ColorParseException (in text, "Text was too short to be any possible supported format.", in text),

// The various hexadecimal cases
['#', ..] hexString => hexString switch
{
// #RGB
['#', var rChar, var gChar, var bChar] chars when chars [1..]
.IsAllAsciiHexDigits () =>
new Color (
byte.Parse ([rChar, rChar], NumberStyles.HexNumber),
byte.Parse ([gChar, gChar], NumberStyles.HexNumber),
byte.Parse ([bChar, bChar], NumberStyles.HexNumber)
),

// #ARGB
['#', var aChar, var rChar, var gChar, var bChar] chars when chars [1..]
.IsAllAsciiHexDigits () =>
new Color (
byte.Parse ([rChar, rChar], NumberStyles.HexNumber),
byte.Parse ([gChar, gChar], NumberStyles.HexNumber),
byte.Parse ([bChar, bChar], NumberStyles.HexNumber),
byte.Parse ([aChar, aChar], NumberStyles.HexNumber)
),

// #RRGGBB
[
'#', var r1Char, var r2Char, var g1Char, var g2Char, var b1Char, var b2Char
] chars when chars [1..].IsAllAsciiHexDigits () =>
new Color (
byte.Parse ([r1Char, r2Char], NumberStyles.HexNumber),
byte.Parse ([g1Char, g2Char], NumberStyles.HexNumber),
byte.Parse ([b1Char, b2Char], NumberStyles.HexNumber)
),

// #AARRGGBB
[
'#', var a1Char, var a2Char,
var r1Char, var r2Char,
var g1Char, var g2Char,
var b1Char, var b2Char
] chars when chars [1..].IsAllAsciiHexDigits () =>
new Color (
byte.Parse ([r1Char, r2Char], NumberStyles.HexNumber),
byte.Parse ([g1Char, g2Char], NumberStyles.HexNumber),
byte.Parse ([b1Char, b2Char], NumberStyles.HexNumber),
byte.Parse ([a1Char, a2Char], NumberStyles.HexNumber)
),
_ => throw new ColorParseException (
in hexString,
$"Color hex string {hexString} was not in a supported format",
in hexString
)
},

// rgb(r,g,b) or rgb(r,g,b,a)
['r', 'g', 'b', '(', .., ')'] => ParseRgbaFormat (in text, 4),

// rgba(r,g,b,a) or rgba(r,g,b)
['r', 'g', 'b', 'a', '(', .., ')'] => ParseRgbaFormat (in text, 5),
// Attempt named colors
{ } when char.IsLetter (text [0]) && ColorStrings.TryParseNamedColor (text, out Color color) => color,
// Any other input
_ => throw new ColorParseException (in text, "Text did not match any expected format.", in text, [])
};
Expand Down Expand Up @@ -585,11 +573,9 @@ public static bool TryParse (ReadOnlySpan<byte> utf8Text, IFormatProvider? provi
[SkipLocalsInit]
public override string ToString ()
{
string? name = ColorStrings.GetW3CColorName (this);

if (name is { })
if (ColorStrings.GetColorName (this) is string colorName)
{
return name;
return colorName;
}

return $"#{R:X2}{G:X2}{B:X2}";
Expand Down
11 changes: 9 additions & 2 deletions Terminal.Gui/Drawing/Color/Color.cs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,5 @@
#nullable enable
using System.Collections.Frozen;
using System.Diagnostics.Contracts;
using System.Drawing;
using System.Globalization;
using System.Numerics;
using System.Runtime.CompilerServices;
Expand Down Expand Up @@ -236,6 +234,15 @@ internal static ColorName16 GetClosestNamedColor16 (Color inputColor)
return ColorExtensions.ColorToName16Map.MinBy (pair => CalculateColorDistance (inputColor, pair.Key)).Value;
}

/// <summary>Converts the given color value to exact named color represented by <see cref="ColorName16"/>.</summary>
/// <param name="inputColor"></param>
/// <param name="colorName16">Successfully converted named color.</param>
/// <returns>True if conversion succeeded; otherwise false.</returns>
internal static bool TryGetExactNamedColor16 (Color inputColor, out ColorName16 colorName16)
{
return ColorExtensions.ColorToName16Map.TryGetValue (inputColor, out colorName16);
}

[SkipLocalsInit]
private static float CalculateColorDistance (in Vector4 color1, in Vector4 color2) { return Vector4.Distance (color1, color2); }

Expand Down
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