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color.go
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color.go
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package color
import (
"fmt"
"math"
"regexp"
"strconv"
"strings"
"github.com/lucasb-eyer/go-colorful"
"github.com/mazznoer/csscolorparser"
)
var themeColorRegex = regexp.MustCompile(`^(N[1-7]|B[1-6]|AA[245]|AB[45])$`)
func IsThemeColor(colorString string) bool {
return themeColorRegex.MatchString(colorString)
}
func Darken(colorString string) (string, error) {
if IsThemeColor(colorString) {
switch {
case colorString[0] == 'B':
switch colorString[1] {
case '1', '2':
return B1, nil
case '3':
return B2, nil
case '4':
return B3, nil
case '5':
return B4, nil
case '6':
return B5, nil
}
case colorString[0:2] == "AA":
switch colorString[2] {
case '2', '4':
return AA2, nil
case '5':
return AA4, nil
}
case colorString[0:2] == "AB":
switch colorString[2] {
case '4':
return AB4, nil
case '5':
return AB5, nil
}
case colorString[0] == 'N':
switch colorString[1] {
case '1', '2':
return N1, nil
case '3':
return N2, nil
case '4':
return N3, nil
case '5':
return N4, nil
case '6':
return N5, nil
case '7':
return N6, nil
}
}
return "", fmt.Errorf("invalid color \"%s\"", colorString)
}
return darkenCSS(colorString)
}
func darkenCSS(colorString string) (string, error) {
c, err := csscolorparser.Parse(colorString)
if err != nil {
return "", err
}
h, s, l := colorful.Color{R: c.R, G: c.G, B: c.B}.Hsl()
// decrease luminance by 10%
return colorful.Hsl(h, s, l-.1).Clamped().Hex(), nil
}
func LuminanceCategory(colorString string) (string, error) {
l, err := Luminance(colorString)
if err != nil {
return "", err
}
switch {
case l >= .88:
return "bright", nil
case l >= .55:
return "normal", nil
case l >= .30:
return "dark", nil
default:
return "darker", nil
}
}
func Luminance(colorString string) (float64, error) {
c, err := csscolorparser.Parse(colorString)
if err != nil {
return 0, err
}
// https://stackoverflow.com/a/596243
l := float64(
float64(0.299)*float64(c.R) +
float64(0.587)*float64(c.G) +
float64(0.114)*float64(c.B),
)
return l, nil
}
const (
N1 = "N1" // foreground color
N2 = "N2"
N3 = "N3"
N4 = "N4"
N5 = "N5"
N6 = "N6"
N7 = "N7" // background color
// Base Colors: used for containers
B1 = "B1"
B2 = "B2"
B3 = "B3"
B4 = "B4"
B5 = "B5"
B6 = "B6"
// Alternative colors A
AA2 = "AA2"
AA4 = "AA4"
AA5 = "AA5"
// Alternative colors B
AB4 = "AB4"
AB5 = "AB5"
// Special
Empty = ""
None = "none"
)
type RGB struct {
Red uint8
Green uint8
Blue uint8
}
// https://github.com/go-playground/colors/blob/main/rgb.go#L89
func (c *RGB) IsLight() bool {
r := float64(c.Red)
g := float64(c.Green)
b := float64(c.Blue)
hsp := math.Sqrt(0.299*math.Pow(r, 2) + 0.587*math.Pow(g, 2) + 0.114*math.Pow(b, 2))
return hsp > 130
}
// https://gist.github.com/CraigChilds94/6514edbc6a2db5e434a245487c525c75
func Hex2RGB(hex string) (RGB, error) {
var rgb RGB
if len(hex) > 3 && hex[0] == '#' {
hex = hex[1:]
} else {
return RGB{}, fmt.Errorf("cannot parse hex color %v", hex)
}
values, err := strconv.ParseUint(hex, 16, 32)
if err != nil {
return RGB{}, err
}
rgb = RGB{
Red: uint8(values >> 16),
Green: uint8((values >> 8) & 0xFF),
Blue: uint8(values & 0xFF),
}
return rgb, nil
}
// https://www.w3.org/TR/css-color-4/#svg-color
var namedRgbMap = map[string][]uint8{
"aliceblue": {240, 248, 255}, // #F0F8FF
"antiquewhite": {250, 235, 215}, // #FAEBD7
"aqua": {0, 255, 255}, // #00FFFF
"aquamarine": {127, 255, 212}, // #7FFFD4
"azure": {240, 255, 255}, // #F0FFFF
"beige": {245, 245, 220}, // #F5F5DC
"bisque": {255, 228, 196}, // #FFE4C4
"black": {0, 0, 0}, // #000000
"blanchedalmond": {255, 235, 205}, // #FFEBCD
"blue": {0, 0, 255}, // #0000FF
"blueviolet": {138, 43, 226}, // #8A2BE2
"brown": {165, 42, 42}, // #A52A2A
"burlywood": {222, 184, 135}, // #DEB887
"cadetblue": {95, 158, 160}, // #5F9EA0
"chartreuse": {127, 255, 0}, // #7FFF00
"chocolate": {210, 105, 30}, // #D2691E
"coral": {255, 127, 80}, // #FF7F50
"cornflowerblue": {100, 149, 237}, // #6495ED
"cornsilk": {255, 248, 220}, // #FFF8DC
"crimson": {220, 20, 60}, // #DC143C
"cyan": {0, 255, 255}, // #00FFFF
"darkblue": {0, 0, 139}, // #00008B
"darkcyan": {0, 139, 139}, // #008B8B
"darkgoldenrod": {184, 134, 11}, // #B8860B
"darkgray": {169, 169, 169}, // #A9A9A9
"darkgreen": {0, 100, 0}, // #006400
"darkgrey": {169, 169, 169}, // #A9A9A9
"darkkhaki": {189, 183, 107}, // #BDB76B
"darkmagenta": {139, 0, 139}, // #8B008B
"darkolivegreen": {85, 107, 47}, // #556B2F
"darkorange": {255, 140, 0}, // #FF8C00
"darkorchid": {153, 50, 204}, // #9932CC
"darkred": {139, 0, 0}, // #8B0000
"darksalmon": {233, 150, 122}, // #E9967A
"darkseagreen": {143, 188, 143}, // #8FBC8F
"darkslateblue": {72, 61, 139}, // #483D8B
"darkslategray": {47, 79, 79}, // #2F4F4F
"darkslategrey": {47, 79, 79}, // #2F4F4F
"darkturquoise": {0, 206, 209}, // #00CED1
"darkviolet": {148, 0, 211}, // #9400D3
"deeppink": {255, 20, 147}, // #FF1493
"deepskyblue": {0, 191, 255}, // #00BFFF
"dimgray": {105, 105, 105}, // #696969
"dimgrey": {105, 105, 105}, // #696969
"dodgerblue": {30, 144, 255}, // #1E90FF
"firebrick": {178, 34, 34}, // #B22222
"floralwhite": {255, 250, 240}, // #FFFAF0
"forestgreen": {34, 139, 34}, // #228B22
"fuchsia": {255, 0, 255}, // #FF00FF
"gainsboro": {220, 220, 220}, // #DCDCDC
"ghostwhite": {248, 248, 255}, // #F8F8FF
"gold": {255, 215, 0}, // #FFD700
"goldenrod": {218, 165, 32}, // #DAA520
"gray": {128, 128, 128}, // #808080
"green": {0, 128, 0}, // #008000
"greenyellow": {173, 255, 47}, // #ADFF2F
"grey": {128, 128, 128}, // #808080
"honeydew": {240, 255, 240}, // #F0FFF0
"hotpink": {255, 105, 180}, // #FF69B4
"indianred": {205, 92, 92}, // #CD5C5C
"indigo": {75, 0, 130}, // #4B0082
"ivory": {255, 255, 240}, // #FFFFF0
"khaki": {240, 230, 140}, // #F0E68C
"lavender": {230, 230, 250}, // #E6E6FA
"lavenderblush": {255, 240, 245}, // #FFF0F5
"lawngreen": {124, 252, 0}, // #7CFC00
"lemonchiffon": {255, 250, 205}, // #FFFACD
"lightblue": {173, 216, 230}, // #ADD8E6
"lightcoral": {240, 128, 128}, // #F08080
"lightcyan": {224, 255, 255}, // #E0FFFF
"lightgoldenrodyellow": {250, 250, 210}, // #FAFAD2
"lightgray": {211, 211, 211}, // #D3D3D3
"lightgreen": {144, 238, 144}, // #90EE90
"lightgrey": {211, 211, 211}, // #D3D3D3
"lightpink": {255, 182, 193}, // #FFB6C1
"lightsalmon": {255, 160, 122}, // #FFA07A
"lightseagreen": {32, 178, 170}, // #20B2AA
"lightskyblue": {135, 206, 250}, // #87CEFA
"lightslategray": {119, 136, 153}, // #778899
"lightslategrey": {119, 136, 153}, // #778899
"lightsteelblue": {176, 196, 222}, // #B0C4DE
"lightyellow": {255, 255, 224}, // #FFFFE0
"lime": {0, 255, 0}, // #00FF00
"limegreen": {50, 205, 50}, // #32CD32
"linen": {250, 240, 230}, // #FAF0E6
"magenta": {255, 0, 255}, // #FF00FF
"maroon": {128, 0, 0}, // #800000
"mediumaquamarine": {102, 205, 170}, // #66CDAA
"mediumblue": {0, 0, 205}, // #0000CD
"mediumorchid": {186, 85, 211}, // #BA55D3
"mediumpurple": {147, 112, 219}, // #9370DB
"mediumseagreen": {60, 179, 113}, // #3CB371
"mediumslateblue": {123, 104, 238}, // #7B68EE
"mediumspringgreen": {0, 250, 154}, // #00FA9A
"mediumturquoise": {72, 209, 204}, // #48D1CC
"mediumvioletred": {199, 21, 133}, // #C71585
"midnightblue": {25, 25, 112}, // #191970
"muintcream": {245, 255, 250}, // #F5FFFA
"mistyrose": {255, 228, 225}, // #FFE4E1
"moccasin": {255, 228, 181}, // #FFE4B5
"navajowhite": {255, 222, 173}, // #FFDEAD
"navy": {0, 0, 128}, // #000080
"oldlace": {253, 245, 230}, // #FDF5E6
"olive": {128, 128, 0}, // #808000
"olivedrab": {107, 142, 35}, // #6B8E23
"orange": {255, 165, 0}, // #FFA500
"orangered": {255, 69, 0}, // #FF4500
"orchid": {218, 112, 214}, // #DA70D6
"palegoldenrod": {238, 232, 170}, // #EEE8AA
"palegreen": {152, 251, 152}, // #98FB98
"paleturquoise": {175, 238, 238}, // #AFEEEE
"palevioletred": {219, 112, 147}, // #DB7093
"papayawhip": {255, 239, 213}, // #FFEFD5
"peachpuff": {255, 218, 185}, // #FFDAB9
"peru": {205, 133, 63}, // #CD853F
"pink": {255, 192, 203}, // #FFC0CB
"plum": {221, 160, 221}, // #DDA0DD
"powderblue": {176, 224, 230}, // #B0E0E6
"purple": {128, 0, 128}, // #800080
"red": {255, 0, 0}, // #FF0000
"rebeccapurple": {102, 51, 153}, // #663399
"rosybrown": {188, 143, 143}, // #BC8F8F
"royalblue": {65, 105, 225}, // #4169E1
"saddlebrown": {139, 69, 19}, // #8B4513
"salmon": {250, 128, 114}, // #FA8072
"sandybrown": {244, 164, 96}, // #F4A460
"seagreen": {46, 139, 87}, // #2E8B57
"seashell": {255, 245, 238}, // #FFF5EE
"sienna": {160, 82, 45}, // #A0522D
"silver": {192, 192, 192}, // #C0C0C0
"skyblue": {135, 206, 235}, // #87CEEB
"slateblue": {106, 90, 205}, // #6A5ACD
"slategray": {112, 128, 144}, // #708090
"slategrey": {112, 128, 144}, // #708090
"snow": {255, 250, 250}, // #FFFAFA
"springgreen": {0, 255, 127}, // #00FF7F
"steelblue": {70, 130, 180}, // #4682B4
"tan": {210, 180, 140}, // #D2B48C
"teal": {0, 128, 128}, // #008080
"thistle": {216, 191, 216}, // #D8BFD8
"tomato": {255, 99, 71}, // #FF6347
"turquoise": {64, 224, 208}, // #40E0D0
"violet": {238, 130, 238}, // #EE82EE
"wheat": {245, 222, 179}, // #F5DEB3
"white": {255, 255, 255}, // #FFFFFF
"whitesmoke": {245, 245, 245}, // #F5F5F5
"yellow": {255, 255, 0}, // #FFFF00
"yellowgreen": {154, 205, 50}, // #9ACD32
}
func Name2RGB(name string) RGB {
if rgb, ok := namedRgbMap[strings.ToLower(name)]; ok {
return RGB{
Red: rgb[0],
Green: rgb[1],
Blue: rgb[2],
}
}
return RGB{}
}
var NamedColors = []string{
"currentcolor",
"transparent",
"aliceblue",
"antiquewhite",
"aqua",
"aquamarine",
"azure",
"beige",
"bisque",
"black",
"blanchedalmond",
"blue",
"blueviolet",
"brown",
"burlywood",
"cadetblue",
"chartreuse",
"chocolate",
"coral",
"cornflowerblue",
"cornsilk",
"crimson",
"cyan",
"darkblue",
"darkcyan",
"darkgoldenrod",
"darkgray",
"darkgrey",
"darkgreen",
"darkkhaki",
"darkmagenta",
"darkolivegreen",
"darkorange",
"darkorchid",
"darkred",
"darksalmon",
"darkseagreen",
"darkslateblue",
"darkslategray",
"darkslategrey",
"darkturquoise",
"darkviolet",
"deeppink",
"deepskyblue",
"dimgray",
"dimgrey",
"dodgerblue",
"firebrick",
"floralwhite",
"forestgreen",
"fuchsia",
"gainsboro",
"ghostwhite",
"gold",
"goldenrod",
"gray",
"grey",
"green",
"greenyellow",
"honeydew",
"hotpink",
"indianred",
"indigo",
"ivory",
"khaki",
"lavender",
"lavenderblush",
"lawngreen",
"lemonchiffon",
"lightblue",
"lightcoral",
"lightcyan",
"lightgoldenrodyellow",
"lightgray",
"lightgrey",
"lightgreen",
"lightpink",
"lightsalmon",
"lightseagreen",
"lightskyblue",
"lightslategray",
"lightslategrey",
"lightsteelblue",
"lightyellow",
"lime",
"limegreen",
"linen",
"magenta",
"maroon",
"mediumaquamarine",
"mediumblue",
"mediumorchid",
"mediumpurple",
"mediumseagreen",
"mediumslateblue",
"mediumspringgreen",
"mediumturquoise",
"mediumvioletred",
"midnightblue",
"mintcream",
"mistyrose",
"moccasin",
"navajowhite",
"navy",
"oldlace",
"olive",
"olivedrab",
"orange",
"orangered",
"orchid",
"palegoldenrod",
"palegreen",
"paleturquoise",
"palevioletred",
"papayawhip",
"peachpuff",
"peru",
"pink",
"plum",
"powderblue",
"purple",
"rebeccapurple",
"red",
"rosybrown",
"royalblue",
"saddlebrown",
"salmon",
"sandybrown",
"seagreen",
"seashell",
"sienna",
"silver",
"skyblue",
"slateblue",
"slategray",
"slategrey",
"snow",
"springgreen",
"steelblue",
"tan",
"teal",
"thistle",
"tomato",
"turquoise",
"violet",
"wheat",
"white",
"whitesmoke",
"yellow",
"yellowgreen",
}
var ColorHexRegex = regexp.MustCompile(`^#(([0-9a-fA-F]{2}){3}|([0-9a-fA-F]){3})$`)