color-contrast-finder
Version:
The Color Contrast Finder is a library that automatically selects text colors that contrast with a given color.
220 lines (219 loc) • 5.9 kB
JavaScript
const g = {
WHITE: "#FFFFFF",
BLACK: "#000000"
}, h = 1, u = {
aliceblue: "#f0f8ff",
antiquewhite: "#faebd7",
aqua: "#00ffff",
aquamarine: "#7fffd4",
azure: "#f0ffff",
beige: "#f5f5dc",
bisque: "#ffe4c4",
black: "#000000",
blanchedalmond: "#ffebcd",
blue: "#0000ff",
blueviolet: "#8a2be2",
brown: "#a52a2a",
burlywood: "#deb887",
cadetblue: "#5f9ea0",
chartreuse: "#7fff00",
chocolate: "#d2691e",
coral: "#ff7f50",
cornflowerblue: "#6495ed",
cornsilk: "#fff8dc",
crimson: "#dc143c",
cyan: "#00ffff",
darkblue: "#00008b",
darkcyan: "#008b8b",
darkgoldenrod: "#b8860b",
darkgray: "#a9a9a9",
darkgreen: "#006400",
darkgrey: "#a9a9a9",
darkkhaki: "#bdb76b",
darkmagenta: "#8b008b",
darkolivegreen: "#556b2f",
darkorange: "#ff8c00",
darkorchid: "#9932cc",
darkred: "#8b0000",
darksalmon: "#e9967a",
darkseagreen: "#8fbc8f",
darkslateblue: "#483d8b",
darkslategray: "#2f4f4f",
darkslategrey: "#2f4f4f",
darkturquoise: "#00ced1",
darkviolet: "#9400d3",
deeppink: "#ff1493",
deepskyblue: "#00bfff",
dimgray: "#696969",
dimgrey: "#696969",
dodgerblue: "#1e90ff",
firebrick: "#b22222",
floralwhite: "#fffaf0",
forestgreen: "#228b22",
fuchsia: "#ff00ff",
gainsboro: "#dcdcdc",
ghostwhite: "#f8f8ff",
gold: "#ffd700",
goldenrod: "#daa520",
gray: "#808080",
green: "#008000",
greenyellow: "#adff2f",
grey: "#808080",
honeydew: "#f0fff0",
hotpink: "#ff69b4",
indianred: "#cd5c5c",
indigo: "#4b0082",
ivory: "#fffff0",
khaki: "#f0e68c",
lavender: "#e6e6fa",
lavenderblush: "#fff0f5",
lawngreen: "#7cfc00",
lemonchiffon: "#fffacd",
lightblue: "#add8e6",
lightcoral: "#f08080",
lightcyan: "#e0ffff",
lightgoldenrodyellow: "#fafad2",
lightgray: "#d3d3d3",
lightgreen: "#90ee90",
lightgrey: "#d3d3d3",
lightpink: "#ffb6c1",
lightsalmon: "#ffa07a",
lightseagreen: "#20b2aa",
lightskyblue: "#87cefa",
lightslategray: "#778899",
lightslategrey: "#778899",
lightsteelblue: "#b0c4de",
lightyellow: "#ffffe0",
lime: "#00ff00",
limegreen: "#32cd32",
linen: "#faf0e6",
magenta: "#ff00ff",
maroon: "#800000",
mediumaquamarine: "#66cdaa",
mediumblue: "#0000cd",
mediumorchid: "#ba55d3",
mediumpurple: "#9370db",
mediumseagreen: "#3cb371",
mediumslateblue: "#7b68ee",
mediumspringgreen: "#00fa9a",
mediumturquoise: "#48d1cc",
mediumvioletred: "#c71585",
midnightblue: "#191970",
mintcream: "#f5fffa",
mistyrose: "#ffe4e1",
moccasin: "#ffe4b5",
navajowhite: "#ffdead",
navy: "#000080",
oldlace: "#fdf5e6",
olive: "#808000",
olivedrab: "#6b8e23",
orange: "#ffa500",
orangered: "#ff4500",
orchid: "#da70d6",
palegoldenrod: "#eee8aa",
palegreen: "#98fb98",
paleturquoise: "#afeeee",
palevioletred: "#db7093",
papayawhip: "#ffefd5",
peachpuff: "#ffdab9",
peru: "#cd853f",
pink: "#ffc0cb",
plum: "#dda0dd",
powderblue: "#b0e0e6",
purple: "#800080",
red: "#ff0000",
rosybrown: "#bc8f8f",
royalblue: "#4169e1",
saddlebrown: "#8b4513",
salmon: "#fa8072",
sandybrown: "#f4a460",
seagreen: "#2e8b57",
seashell: "#fff5ee",
sienna: "#a0522d",
silver: "#c0c0c0",
skyblue: "#87ceeb",
slateblue: "#6a5acd",
slategray: "#708090",
slategrey: "#708090",
snow: "#fffafa",
springgreen: "#00ff7f",
steelblue: "#4682b4",
tan: "#d2b48c",
teal: "#008080",
thistle: "#d8bfd8",
tomato: "#ff6347",
turquoise: "#40e0d0",
violet: "#ee82ee",
wheat: "#f5deb3",
white: "#ffffff",
whitesmoke: "#f5f5f5",
yellow: "#ffff00",
yellowgreen: "#9acd32"
};
function w(a) {
if (!/^#?([a-fA-F0-9]{3}|[a-fA-F0-9]{4}|[a-fA-F0-9]{6}|[a-fA-F0-9]{8})$/.test(a))
throw new Error("Invalid HEX color code");
const e = a.replace(/^#/, "");
let f, n, o, t = h;
return e.length === 3 || e.length === 4 ? (f = parseInt(e[0] + e[0], 16), n = parseInt(e[1] + e[1], 16), o = parseInt(e[2] + e[2], 16), e.length === 4 && (t = parseInt(e[3] + e[3], 16) / 255)) : (f = parseInt(e.slice(0, 2), 16), n = parseInt(e.slice(2, 4), 16), o = parseInt(e.slice(4, 6), 16), e.length === 8 && (t = parseInt(e.slice(6, 8), 16) / 255)), { r: f, g: n, b: o, a: t };
}
function p(a) {
const r = a.trim(), e = r.startsWith("rgb(") && r.endsWith(")"), f = r.startsWith("rgba(") && r.endsWith(")");
if (!e && !f)
throw new Error("Invalid RGB color code");
const n = r.slice(r.indexOf("(") + 1, -1).split(",");
if (e && n.length !== 3 || f && n.length !== 4)
throw new Error("Invalid RGB color code");
const o = (c) => {
const l = Number(c.trim());
if (!Number.isInteger(l) || l < 0 || l > 255)
throw new Error("Invalid RGB color code");
return l;
}, t = (c) => {
if (c == null)
return h;
const l = Number(c.trim());
if (!Number.isFinite(l) || l < 0 || l > 1)
throw new Error("Invalid RGB color code");
return l;
}, [i, d, s, b] = n;
return {
r: o(i),
g: o(d),
b: o(s),
a: t(b)
};
}
function k(a) {
let r = a.trim().toLowerCase();
if (r in u && (r = u[r]), r.startsWith("#"))
return w(r);
if (r.startsWith("rgb")) {
const e = p(r);
if (e)
return e;
throw new Error("Invalid RGB color format");
}
throw new Error("Invalid color format");
}
function m({ r: a, g: r, b: e }) {
const f = (i) => {
const d = i / 255;
return d <= 0.03928 ? d / 12.92 : Math.pow((d + 0.055) / 1.055, 2.4);
}, n = f(a), o = f(r), t = f(e);
return n * 0.2126 + o * 0.7152 + t * 0.0722;
}
function y(a, r) {
const e = m({ r: 255, g: 255, b: 255 });
return a < 1 ? a * r + (1 - a) * e : r;
}
function v(a, r, e, f) {
return a >= r ? e : f;
}
function I(a) {
const { color: r, threshold: e = 0.5, highColor: f = g.BLACK, lowColor: n = g.WHITE } = a, { r: o, g: t, b: i, a: d } = k(r), s = m({ r: o, g: t, b: i }), b = y(d, s);
return v(b, e, f, n);
}
export {
I as findContrastColor
};