package colorimport ( "fmt" "math" "regexp" "strconv" "strings" "github.com/lucasb-eyer/go-colorful" "github.com/mazznoer/csscolorparser" "oss.terrastruct.com/util-go/go2" )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 () 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 } 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" N2 = "N2" N3 = "N3" N4 = "N4" N5 = "N5" N6 = "N6" N7 = "N7" B1 = "B1" B2 = "B2" B3 = "B3" B4 = "B4" B5 = "B5" B6 = "B6" AA2 = "AA2" AA4 = "AA4" AA5 = "AA5" AB4 = "AB4" AB5 = "AB5" Empty = "" None = "none" )type RGB struct { Red uint8 Green uint8 Blue uint8 }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 }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 }var namedRgbMap = map [string ][]uint8 { "aliceblue" : {240 , 248 , 255 }, "antiquewhite" : {250 , 235 , 215 }, "aqua" : {0 , 255 , 255 }, "aquamarine" : {127 , 255 , 212 }, "azure" : {240 , 255 , 255 }, "beige" : {245 , 245 , 220 }, "bisque" : {255 , 228 , 196 }, "black" : {0 , 0 , 0 }, "blanchedalmond" : {255 , 235 , 205 }, "blue" : {0 , 0 , 255 }, "blueviolet" : {138 , 43 , 226 }, "brown" : {165 , 42 , 42 }, "burlywood" : {222 , 184 , 135 }, "cadetblue" : {95 , 158 , 160 }, "chartreuse" : {127 , 255 , 0 }, "chocolate" : {210 , 105 , 30 }, "coral" : {255 , 127 , 80 }, "cornflowerblue" : {100 , 149 , 237 }, "cornsilk" : {255 , 248 , 220 }, "crimson" : {220 , 20 , 60 }, "cyan" : {0 , 255 , 255 }, "darkblue" : {0 , 0 , 139 }, "darkcyan" : {0 , 139 , 139 }, "darkgoldenrod" : {184 , 134 , 11 }, "darkgray" : {169 , 169 , 169 }, "darkgreen" : {0 , 100 , 0 }, "darkgrey" : {169 , 169 , 169 }, "darkkhaki" : {189 , 183 , 107 }, "darkmagenta" : {139 , 0 , 139 }, "darkolivegreen" : {85 , 107 , 47 }, "darkorange" : {255 , 140 , 0 }, "darkorchid" : {153 , 50 , 204 }, "darkred" : {139 , 0 , 0 }, "darksalmon" : {233 , 150 , 122 }, "darkseagreen" : {143 , 188 , 143 }, "darkslateblue" : {72 , 61 , 139 }, "darkslategray" : {47 , 79 , 79 }, "darkslategrey" : {47 , 79 , 79 }, "darkturquoise" : {0 , 206 , 209 }, "darkviolet" : {148 , 0 , 211 }, "deeppink" : {255 , 20 , 147 }, "deepskyblue" : {0 , 191 , 255 }, "dimgray" : {105 , 105 , 105 }, "dimgrey" : {105 , 105 , 105 }, "dodgerblue" : {30 , 144 , 255 }, "firebrick" : {178 , 34 , 34 }, "floralwhite" : {255 , 250 , 240 }, "forestgreen" : {34 , 139 , 34 }, "fuchsia" : {255 , 0 , 255 }, "gainsboro" : {220 , 220 , 220 }, "ghostwhite" : {248 , 248 , 255 }, "gold" : {255 , 215 , 0 }, "goldenrod" : {218 , 165 , 32 }, "gray" : {128 , 128 , 128 }, "green" : {0 , 128 , 0 }, "greenyellow" : {173 , 255 , 47 }, "grey" : {128 , 128 , 128 }, "honeydew" : {240 , 255 , 240 }, "hotpink" : {255 , 105 , 180 }, "indianred" : {205 , 92 , 92 }, "indigo" : {75 , 0 , 130 }, "ivory" : {255 , 255 , 240 }, "khaki" : {240 , 230 , 140 }, "lavender" : {230 , 230 , 250 }, "lavenderblush" : {255 , 240 , 245 }, "lawngreen" : {124 , 252 , 0 }, "lemonchiffon" : {255 , 250 , 205 }, "lightblue" : {173 , 216 , 230 }, "lightcoral" : {240 , 128 , 128 }, "lightcyan" : {224 , 255 , 255 }, "lightgoldenrodyellow" : {250 , 250 , 210 }, "lightgray" : {211 , 211 , 211 }, "lightgreen" : {144 , 238 , 144 }, "lightgrey" : {211 , 211 , 211 }, "lightpink" : {255 , 182 , 193 }, "lightsalmon" : {255 , 160 , 122 }, "lightseagreen" : {32 , 178 , 170 }, "lightskyblue" : {135 , 206 , 250 }, "lightslategray" : {119 , 136 , 153 }, "lightslategrey" : {119 , 136 , 153 }, "lightsteelblue" : {176 , 196 , 222 }, "lightyellow" : {255 , 255 , 224 }, "lime" : {0 , 255 , 0 }, "limegreen" : {50 , 205 , 50 }, "linen" : {250 , 240 , 230 }, "magenta" : {255 , 0 , 255 }, "maroon" : {128 , 0 , 0 }, "mediumaquamarine" : {102 , 205 , 170 }, "mediumblue" : {0 , 0 , 205 }, "mediumorchid" : {186 , 85 , 211 }, "mediumpurple" : {147 , 112 , 219 }, "mediumseagreen" : {60 , 179 , 113 }, "mediumslateblue" : {123 , 104 , 238 }, "mediumspringgreen" : {0 , 250 , 154 }, "mediumturquoise" : {72 , 209 , 204 }, "mediumvioletred" : {199 , 21 , 133 }, "midnightblue" : {25 , 25 , 112 }, "muintcream" : {245 , 255 , 250 }, "mistyrose" : {255 , 228 , 225 }, "moccasin" : {255 , 228 , 181 }, "navajowhite" : {255 , 222 , 173 }, "navy" : {0 , 0 , 128 }, "oldlace" : {253 , 245 , 230 }, "olive" : {128 , 128 , 0 }, "olivedrab" : {107 , 142 , 35 }, "orange" : {255 , 165 , 0 }, "orangered" : {255 , 69 , 0 }, "orchid" : {218 , 112 , 214 }, "palegoldenrod" : {238 , 232 , 170 }, "palegreen" : {152 , 251 , 152 }, "paleturquoise" : {175 , 238 , 238 }, "palevioletred" : {219 , 112 , 147 }, "papayawhip" : {255 , 239 , 213 }, "peachpuff" : {255 , 218 , 185 }, "peru" : {205 , 133 , 63 }, "pink" : {255 , 192 , 203 }, "plum" : {221 , 160 , 221 }, "powderblue" : {176 , 224 , 230 }, "purple" : {128 , 0 , 128 }, "red" : {255 , 0 , 0 }, "rebeccapurple" : {102 , 51 , 153 }, "rosybrown" : {188 , 143 , 143 }, "royalblue" : {65 , 105 , 225 }, "saddlebrown" : {139 , 69 , 19 }, "salmon" : {250 , 128 , 114 }, "sandybrown" : {244 , 164 , 96 }, "seagreen" : {46 , 139 , 87 }, "seashell" : {255 , 245 , 238 }, "sienna" : {160 , 82 , 45 }, "silver" : {192 , 192 , 192 }, "skyblue" : {135 , 206 , 235 }, "slateblue" : {106 , 90 , 205 }, "slategray" : {112 , 128 , 144 }, "slategrey" : {112 , 128 , 144 }, "snow" : {255 , 250 , 250 }, "springgreen" : {0 , 255 , 127 }, "steelblue" : {70 , 130 , 180 }, "tan" : {210 , 180 , 140 }, "teal" : {0 , 128 , 128 }, "thistle" : {216 , 191 , 216 }, "tomato" : {255 , 99 , 71 }, "turquoise" : {64 , 224 , 208 }, "violet" : {238 , 130 , 238 }, "wheat" : {245 , 222 , 179 }, "white" : {255 , 255 , 255 }, "whitesmoke" : {245 , 245 , 245 }, "yellow" : {255 , 255 , 0 }, "yellowgreen" : {154 , 205 , 50 }, }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})$` )func ValidColor color string ) bool { if !go2 .Contains (NamedColors , strings .ToLower (color )) && !ColorHexRegex .MatchString (color ) && !IsGradient (color ) { return false } return true }
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