Add extracted source directory and README navigation

extracted-source/node_modules/color-convert/conversions.js

@@ -0,0 +1,839 @@
+/* MIT license */
+/* eslint-disable no-mixed-operators */
+const cssKeywords = require('color-name');
+
+// NOTE: conversions should only return primitive values (i.e. arrays, or
+//       values that give correct `typeof` results).
+//       do not use box values types (i.e. Number(), String(), etc.)
+
+const reverseKeywords = {};
+for (const key of Object.keys(cssKeywords)) {
+	reverseKeywords[cssKeywords[key]] = key;
+}
+
+const convert = {
+	rgb: {channels: 3, labels: 'rgb'},
+	hsl: {channels: 3, labels: 'hsl'},
+	hsv: {channels: 3, labels: 'hsv'},
+	hwb: {channels: 3, labels: 'hwb'},
+	cmyk: {channels: 4, labels: 'cmyk'},
+	xyz: {channels: 3, labels: 'xyz'},
+	lab: {channels: 3, labels: 'lab'},
+	lch: {channels: 3, labels: 'lch'},
+	hex: {channels: 1, labels: ['hex']},
+	keyword: {channels: 1, labels: ['keyword']},
+	ansi16: {channels: 1, labels: ['ansi16']},
+	ansi256: {channels: 1, labels: ['ansi256']},
+	hcg: {channels: 3, labels: ['h', 'c', 'g']},
+	apple: {channels: 3, labels: ['r16', 'g16', 'b16']},
+	gray: {channels: 1, labels: ['gray']}
+};
+
+module.exports = convert;
+
+// Hide .channels and .labels properties
+for (const model of Object.keys(convert)) {
+	if (!('channels' in convert[model])) {
+		throw new Error('missing channels property: ' + model);
+	}
+
+	if (!('labels' in convert[model])) {
+		throw new Error('missing channel labels property: ' + model);
+	}
+
+	if (convert[model].labels.length !== convert[model].channels) {
+		throw new Error('channel and label counts mismatch: ' + model);
+	}
+
+	const {channels, labels} = convert[model];
+	delete convert[model].channels;
+	delete convert[model].labels;
+	Object.defineProperty(convert[model], 'channels', {value: channels});
+	Object.defineProperty(convert[model], 'labels', {value: labels});
+}
+
+convert.rgb.hsl = function (rgb) {
+	const r = rgb[0] / 255;
+	const g = rgb[1] / 255;
+	const b = rgb[2] / 255;
+	const min = Math.min(r, g, b);
+	const max = Math.max(r, g, b);
+	const delta = max - min;
+	let h;
+	let s;
+
+	if (max === min) {
+		h = 0;
+	} else if (r === max) {
+		h = (g - b) / delta;
+	} else if (g === max) {
+		h = 2 + (b - r) / delta;
+	} else if (b === max) {
+		h = 4 + (r - g) / delta;
+	}
+
+	h = Math.min(h * 60, 360);
+
+	if (h < 0) {
+		h += 360;
+	}
+
+	const l = (min + max) / 2;
+
+	if (max === min) {
+		s = 0;
+	} else if (l <= 0.5) {
+		s = delta / (max + min);
+	} else {
+		s = delta / (2 - max - min);
+	}
+
+	return [h, s * 100, l * 100];
+};
+
+convert.rgb.hsv = function (rgb) {
+	let rdif;
+	let gdif;
+	let bdif;
+	let h;
+	let s;
+
+	const r = rgb[0] / 255;
+	const g = rgb[1] / 255;
+	const b = rgb[2] / 255;
+	const v = Math.max(r, g, b);
+	const diff = v - Math.min(r, g, b);
+	const diffc = function (c) {
+		return (v - c) / 6 / diff + 1 / 2;
+	};
+
+	if (diff === 0) {
+		h = 0;
+		s = 0;
+	} else {
+		s = diff / v;
+		rdif = diffc(r);
+		gdif = diffc(g);
+		bdif = diffc(b);
+
+		if (r === v) {
+			h = bdif - gdif;
+		} else if (g === v) {
+			h = (1 / 3) + rdif - bdif;
+		} else if (b === v) {
+			h = (2 / 3) + gdif - rdif;
+		}
+
+		if (h < 0) {
+			h += 1;
+		} else if (h > 1) {
+			h -= 1;
+		}
+	}
+
+	return [
+		h * 360,
+		s * 100,
+		v * 100
+	];
+};
+
+convert.rgb.hwb = function (rgb) {
+	const r = rgb[0];
+	const g = rgb[1];
+	let b = rgb[2];
+	const h = convert.rgb.hsl(rgb)[0];
+	const w = 1 / 255 * Math.min(r, Math.min(g, b));
+
+	b = 1 - 1 / 255 * Math.max(r, Math.max(g, b));
+
+	return [h, w * 100, b * 100];
+};
+
+convert.rgb.cmyk = function (rgb) {
+	const r = rgb[0] / 255;
+	const g = rgb[1] / 255;
+	const b = rgb[2] / 255;
+
+	const k = Math.min(1 - r, 1 - g, 1 - b);
+	const c = (1 - r - k) / (1 - k) || 0;
+	const m = (1 - g - k) / (1 - k) || 0;
+	const y = (1 - b - k) / (1 - k) || 0;
+
+	return [c * 100, m * 100, y * 100, k * 100];
+};
+
+function comparativeDistance(x, y) {
+	/*
+		See https://en.m.wikipedia.org/wiki/Euclidean_distance#Squared_Euclidean_distance
+	*/
+	return (
+		((x[0] - y[0]) ** 2) +
+		((x[1] - y[1]) ** 2) +
+		((x[2] - y[2]) ** 2)
+	);
+}
+
+convert.rgb.keyword = function (rgb) {
+	const reversed = reverseKeywords[rgb];
+	if (reversed) {
+		return reversed;
+	}
+
+	let currentClosestDistance = Infinity;
+	let currentClosestKeyword;
+
+	for (const keyword of Object.keys(cssKeywords)) {
+		const value = cssKeywords[keyword];
+
+		// Compute comparative distance
+		const distance = comparativeDistance(rgb, value);
+
+		// Check if its less, if so set as closest
+		if (distance < currentClosestDistance) {
+			currentClosestDistance = distance;
+			currentClosestKeyword = keyword;
+		}
+	}
+
+	return currentClosestKeyword;
+};
+
+convert.keyword.rgb = function (keyword) {
+	return cssKeywords[keyword];
+};
+
+convert.rgb.xyz = function (rgb) {
+	let r = rgb[0] / 255;
+	let g = rgb[1] / 255;
+	let b = rgb[2] / 255;
+
+	// Assume sRGB
+	r = r > 0.04045 ? (((r + 0.055) / 1.055) ** 2.4) : (r / 12.92);
+	g = g > 0.04045 ? (((g + 0.055) / 1.055) ** 2.4) : (g / 12.92);
+	b = b > 0.04045 ? (((b + 0.055) / 1.055) ** 2.4) : (b / 12.92);
+
+	const x = (r * 0.4124) + (g * 0.3576) + (b * 0.1805);
+	const y = (r * 0.2126) + (g * 0.7152) + (b * 0.0722);
+	const z = (r * 0.0193) + (g * 0.1192) + (b * 0.9505);
+
+	return [x * 100, y * 100, z * 100];
+};
+
+convert.rgb.lab = function (rgb) {
+	const xyz = convert.rgb.xyz(rgb);
+	let x = xyz[0];
+	let y = xyz[1];
+	let z = xyz[2];
+
+	x /= 95.047;
+	y /= 100;
+	z /= 108.883;
+
+	x = x > 0.008856 ? (x ** (1 / 3)) : (7.787 * x) + (16 / 116);
+	y = y > 0.008856 ? (y ** (1 / 3)) : (7.787 * y) + (16 / 116);
+	z = z > 0.008856 ? (z ** (1 / 3)) : (7.787 * z) + (16 / 116);
+
+	const l = (116 * y) - 16;
+	const a = 500 * (x - y);
+	const b = 200 * (y - z);
+
+	return [l, a, b];
+};
+
+convert.hsl.rgb = function (hsl) {
+	const h = hsl[0] / 360;
+	const s = hsl[1] / 100;
+	const l = hsl[2] / 100;
+	let t2;
+	let t3;
+	let val;
+
+	if (s === 0) {
+		val = l * 255;
+		return [val, val, val];
+	}
+
+	if (l < 0.5) {
+		t2 = l * (1 + s);
+	} else {
+		t2 = l + s - l * s;
+	}
+
+	const t1 = 2 * l - t2;
+
+	const rgb = [0, 0, 0];
+	for (let i = 0; i < 3; i++) {
+		t3 = h + 1 / 3 * -(i - 1);
+		if (t3 < 0) {
+			t3++;
+		}
+
+		if (t3 > 1) {
+			t3--;
+		}
+
+		if (6 * t3 < 1) {
+			val = t1 + (t2 - t1) * 6 * t3;
+		} else if (2 * t3 < 1) {
+			val = t2;
+		} else if (3 * t3 < 2) {
+			val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
+		} else {
+			val = t1;
+		}
+
+		rgb[i] = val * 255;
+	}
+
+	return rgb;
+};
+
+convert.hsl.hsv = function (hsl) {
+	const h = hsl[0];
+	let s = hsl[1] / 100;
+	let l = hsl[2] / 100;
+	let smin = s;
+	const lmin = Math.max(l, 0.01);
+
+	l *= 2;
+	s *= (l <= 1) ? l : 2 - l;
+	smin *= lmin <= 1 ? lmin : 2 - lmin;
+	const v = (l + s) / 2;
+	const sv = l === 0 ? (2 * smin) / (lmin + smin) : (2 * s) / (l + s);
+
+	return [h, sv * 100, v * 100];
+};
+
+convert.hsv.rgb = function (hsv) {
+	const h = hsv[0] / 60;
+	const s = hsv[1] / 100;
+	let v = hsv[2] / 100;
+	const hi = Math.floor(h) % 6;
+
+	const f = h - Math.floor(h);
+	const p = 255 * v * (1 - s);
+	const q = 255 * v * (1 - (s * f));
+	const t = 255 * v * (1 - (s * (1 - f)));
+	v *= 255;
+
+	switch (hi) {
+		case 0:
+			return [v, t, p];
+		case 1:
+			return [q, v, p];
+		case 2:
+			return [p, v, t];
+		case 3:
+			return [p, q, v];
+		case 4:
+			return [t, p, v];
+		case 5:
+			return [v, p, q];
+	}
+};
+
+convert.hsv.hsl = function (hsv) {
+	const h = hsv[0];
+	const s = hsv[1] / 100;
+	const v = hsv[2] / 100;
+	const vmin = Math.max(v, 0.01);
+	let sl;
+	let l;
+
+	l = (2 - s) * v;
+	const lmin = (2 - s) * vmin;
+	sl = s * vmin;
+	sl /= (lmin <= 1) ? lmin : 2 - lmin;
+	sl = sl || 0;
+	l /= 2;
+
+	return [h, sl * 100, l * 100];
+};
+
+// http://dev.w3.org/csswg/css-color/#hwb-to-rgb
+convert.hwb.rgb = function (hwb) {
+	const h = hwb[0] / 360;
+	let wh = hwb[1] / 100;
+	let bl = hwb[2] / 100;
+	const ratio = wh + bl;
+	let f;
+
+	// Wh + bl cant be > 1
+	if (ratio > 1) {
+		wh /= ratio;
+		bl /= ratio;
+	}
+
+	const i = Math.floor(6 * h);
+	const v = 1 - bl;
+	f = 6 * h - i;
+
+	if ((i & 0x01) !== 0) {
+		f = 1 - f;
+	}
+
+	const n = wh + f * (v - wh); // Linear interpolation
+
+	let r;
+	let g;
+	let b;
+	/* eslint-disable max-statements-per-line,no-multi-spaces */
+	switch (i) {
+		default:
+		case 6:
+		case 0: r = v;  g = n;  b = wh; break;
+		case 1: r = n;  g = v;  b = wh; break;
+		case 2: r = wh; g = v;  b = n; break;
+		case 3: r = wh; g = n;  b = v; break;
+		case 4: r = n;  g = wh; b = v; break;
+		case 5: r = v;  g = wh; b = n; break;
+	}
+	/* eslint-enable max-statements-per-line,no-multi-spaces */
+
+	return [r * 255, g * 255, b * 255];
+};
+
+convert.cmyk.rgb = function (cmyk) {
+	const c = cmyk[0] / 100;
+	const m = cmyk[1] / 100;
+	const y = cmyk[2] / 100;
+	const k = cmyk[3] / 100;
+
+	const r = 1 - Math.min(1, c * (1 - k) + k);
+	const g = 1 - Math.min(1, m * (1 - k) + k);
+	const b = 1 - Math.min(1, y * (1 - k) + k);
+
+	return [r * 255, g * 255, b * 255];
+};
+
+convert.xyz.rgb = function (xyz) {
+	const x = xyz[0] / 100;
+	const y = xyz[1] / 100;
+	const z = xyz[2] / 100;
+	let r;
+	let g;
+	let b;
+
+	r = (x * 3.2406) + (y * -1.5372) + (z * -0.4986);
+	g = (x * -0.9689) + (y * 1.8758) + (z * 0.0415);
+	b = (x * 0.0557) + (y * -0.2040) + (z * 1.0570);
+
+	// Assume sRGB
+	r = r > 0.0031308
+		? ((1.055 * (r ** (1.0 / 2.4))) - 0.055)
+		: r * 12.92;
+
+	g = g > 0.0031308
+		? ((1.055 * (g ** (1.0 / 2.4))) - 0.055)
+		: g * 12.92;
+
+	b = b > 0.0031308
+		? ((1.055 * (b ** (1.0 / 2.4))) - 0.055)
+		: b * 12.92;
+
+	r = Math.min(Math.max(0, r), 1);
+	g = Math.min(Math.max(0, g), 1);
+	b = Math.min(Math.max(0, b), 1);
+
+	return [r * 255, g * 255, b * 255];
+};
+
+convert.xyz.lab = function (xyz) {
+	let x = xyz[0];
+	let y = xyz[1];
+	let z = xyz[2];
+
+	x /= 95.047;
+	y /= 100;
+	z /= 108.883;
+
+	x = x > 0.008856 ? (x ** (1 / 3)) : (7.787 * x) + (16 / 116);
+	y = y > 0.008856 ? (y ** (1 / 3)) : (7.787 * y) + (16 / 116);
+	z = z > 0.008856 ? (z ** (1 / 3)) : (7.787 * z) + (16 / 116);
+
+	const l = (116 * y) - 16;
+	const a = 500 * (x - y);
+	const b = 200 * (y - z);
+
+	return [l, a, b];
+};
+
+convert.lab.xyz = function (lab) {
+	const l = lab[0];
+	const a = lab[1];
+	const b = lab[2];
+	let x;
+	let y;
+	let z;
+
+	y = (l + 16) / 116;
+	x = a / 500 + y;
+	z = y - b / 200;
+
+	const y2 = y ** 3;
+	const x2 = x ** 3;
+	const z2 = z ** 3;
+	y = y2 > 0.008856 ? y2 : (y - 16 / 116) / 7.787;
+	x = x2 > 0.008856 ? x2 : (x - 16 / 116) / 7.787;
+	z = z2 > 0.008856 ? z2 : (z - 16 / 116) / 7.787;
+
+	x *= 95.047;
+	y *= 100;
+	z *= 108.883;
+
+	return [x, y, z];
+};
+
+convert.lab.lch = function (lab) {
+	const l = lab[0];
+	const a = lab[1];
+	const b = lab[2];
+	let h;
+
+	const hr = Math.atan2(b, a);
+	h = hr * 360 / 2 / Math.PI;
+
+	if (h < 0) {
+		h += 360;
+	}
+
+	const c = Math.sqrt(a * a + b * b);
+
+	return [l, c, h];
+};
+
+convert.lch.lab = function (lch) {
+	const l = lch[0];
+	const c = lch[1];
+	const h = lch[2];
+
+	const hr = h / 360 * 2 * Math.PI;
+	const a = c * Math.cos(hr);
+	const b = c * Math.sin(hr);
+
+	return [l, a, b];
+};
+
+convert.rgb.ansi16 = function (args, saturation = null) {
+	const [r, g, b] = args;
+	let value = saturation === null ? convert.rgb.hsv(args)[2] : saturation; // Hsv -> ansi16 optimization
+
+	value = Math.round(value / 50);
+
+	if (value === 0) {
+		return 30;
+	}
+
+	let ansi = 30
+		+ ((Math.round(b / 255) << 2)
+		| (Math.round(g / 255) << 1)
+		| Math.round(r / 255));
+
+	if (value === 2) {
+		ansi += 60;
+	}
+
+	return ansi;
+};
+
+convert.hsv.ansi16 = function (args) {
+	// Optimization here; we already know the value and don't need to get
+	// it converted for us.
+	return convert.rgb.ansi16(convert.hsv.rgb(args), args[2]);
+};
+
+convert.rgb.ansi256 = function (args) {
+	const r = args[0];
+	const g = args[1];
+	const b = args[2];
+
+	// We use the extended greyscale palette here, with the exception of
+	// black and white. normal palette only has 4 greyscale shades.
+	if (r === g && g === b) {
+		if (r < 8) {
+			return 16;
+		}
+
+		if (r > 248) {
+			return 231;
+		}
+
+		return Math.round(((r - 8) / 247) * 24) + 232;
+	}
+
+	const ansi = 16
+		+ (36 * Math.round(r / 255 * 5))
+		+ (6 * Math.round(g / 255 * 5))
+		+ Math.round(b / 255 * 5);
+
+	return ansi;
+};
+
+convert.ansi16.rgb = function (args) {
+	let color = args % 10;
+
+	// Handle greyscale
+	if (color === 0 || color === 7) {
+		if (args > 50) {
+			color += 3.5;
+		}
+
+		color = color / 10.5 * 255;
+
+		return [color, color, color];
+	}
+
+	const mult = (~~(args > 50) + 1) * 0.5;
+	const r = ((color & 1) * mult) * 255;
+	const g = (((color >> 1) & 1) * mult) * 255;
+	const b = (((color >> 2) & 1) * mult) * 255;
+
+	return [r, g, b];
+};
+
+convert.ansi256.rgb = function (args) {
+	// Handle greyscale
+	if (args >= 232) {
+		const c = (args - 232) * 10 + 8;
+		return [c, c, c];
+	}
+
+	args -= 16;
+
+	let rem;
+	const r = Math.floor(args / 36) / 5 * 255;
+	const g = Math.floor((rem = args % 36) / 6) / 5 * 255;
+	const b = (rem % 6) / 5 * 255;
+
+	return [r, g, b];
+};
+
+convert.rgb.hex = function (args) {
+	const integer = ((Math.round(args[0]) & 0xFF) << 16)
+		+ ((Math.round(args[1]) & 0xFF) << 8)
+		+ (Math.round(args[2]) & 0xFF);
+
+	const string = integer.toString(16).toUpperCase();
+	return '000000'.substring(string.length) + string;
+};
+
+convert.hex.rgb = function (args) {
+	const match = args.toString(16).match(/[a-f0-9]{6}|[a-f0-9]{3}/i);
+	if (!match) {
+		return [0, 0, 0];
+	}
+
+	let colorString = match[0];
+
+	if (match[0].length === 3) {
+		colorString = colorString.split('').map(char => {
+			return char + char;
+		}).join('');
+	}
+
+	const integer = parseInt(colorString, 16);
+	const r = (integer >> 16) & 0xFF;
+	const g = (integer >> 8) & 0xFF;
+	const b = integer & 0xFF;
+
+	return [r, g, b];
+};
+
+convert.rgb.hcg = function (rgb) {
+	const r = rgb[0] / 255;
+	const g = rgb[1] / 255;
+	const b = rgb[2] / 255;
+	const max = Math.max(Math.max(r, g), b);
+	const min = Math.min(Math.min(r, g), b);
+	const chroma = (max - min);
+	let grayscale;
+	let hue;
+
+	if (chroma < 1) {
+		grayscale = min / (1 - chroma);
+	} else {
+		grayscale = 0;
+	}
+
+	if (chroma <= 0) {
+		hue = 0;
+	} else
+	if (max === r) {
+		hue = ((g - b) / chroma) % 6;
+	} else
+	if (max === g) {
+		hue = 2 + (b - r) / chroma;
+	} else {
+		hue = 4 + (r - g) / chroma;
+	}
+
+	hue /= 6;
+	hue %= 1;
+
+	return [hue * 360, chroma * 100, grayscale * 100];
+};
+
+convert.hsl.hcg = function (hsl) {
+	const s = hsl[1] / 100;
+	const l = hsl[2] / 100;
+
+	const c = l < 0.5 ? (2.0 * s * l) : (2.0 * s * (1.0 - l));
+
+	let f = 0;
+	if (c < 1.0) {
+		f = (l - 0.5 * c) / (1.0 - c);
+	}
+
+	return [hsl[0], c * 100, f * 100];
+};
+
+convert.hsv.hcg = function (hsv) {
+	const s = hsv[1] / 100;
+	const v = hsv[2] / 100;
+
+	const c = s * v;
+	let f = 0;
+
+	if (c < 1.0) {
+		f = (v - c) / (1 - c);
+	}
+
+	return [hsv[0], c * 100, f * 100];
+};
+
+convert.hcg.rgb = function (hcg) {
+	const h = hcg[0] / 360;
+	const c = hcg[1] / 100;
+	const g = hcg[2] / 100;
+
+	if (c === 0.0) {
+		return [g * 255, g * 255, g * 255];
+	}
+
+	const pure = [0, 0, 0];
+	const hi = (h % 1) * 6;
+	const v = hi % 1;
+	const w = 1 - v;
+	let mg = 0;
+
+	/* eslint-disable max-statements-per-line */
+	switch (Math.floor(hi)) {
+		case 0:
+			pure[0] = 1; pure[1] = v; pure[2] = 0; break;
+		case 1:
+			pure[0] = w; pure[1] = 1; pure[2] = 0; break;
+		case 2:
+			pure[0] = 0; pure[1] = 1; pure[2] = v; break;
+		case 3:
+			pure[0] = 0; pure[1] = w; pure[2] = 1; break;
+		case 4:
+			pure[0] = v; pure[1] = 0; pure[2] = 1; break;
+		default:
+			pure[0] = 1; pure[1] = 0; pure[2] = w;
+	}
+	/* eslint-enable max-statements-per-line */
+
+	mg = (1.0 - c) * g;
+
+	return [
+		(c * pure[0] + mg) * 255,
+		(c * pure[1] + mg) * 255,
+		(c * pure[2] + mg) * 255
+	];
+};
+
+convert.hcg.hsv = function (hcg) {
+	const c = hcg[1] / 100;
+	const g = hcg[2] / 100;
+
+	const v = c + g * (1.0 - c);
+	let f = 0;
+
+	if (v > 0.0) {
+		f = c / v;
+	}
+
+	return [hcg[0], f * 100, v * 100];
+};
+
+convert.hcg.hsl = function (hcg) {
+	const c = hcg[1] / 100;
+	const g = hcg[2] / 100;
+
+	const l = g * (1.0 - c) + 0.5 * c;
+	let s = 0;
+
+	if (l > 0.0 && l < 0.5) {
+		s = c / (2 * l);
+	} else
+	if (l >= 0.5 && l < 1.0) {
+		s = c / (2 * (1 - l));
+	}
+
+	return [hcg[0], s * 100, l * 100];
+};
+
+convert.hcg.hwb = function (hcg) {
+	const c = hcg[1] / 100;
+	const g = hcg[2] / 100;
+	const v = c + g * (1.0 - c);
+	return [hcg[0], (v - c) * 100, (1 - v) * 100];
+};
+
+convert.hwb.hcg = function (hwb) {
+	const w = hwb[1] / 100;
+	const b = hwb[2] / 100;
+	const v = 1 - b;
+	const c = v - w;
+	let g = 0;
+
+	if (c < 1) {
+		g = (v - c) / (1 - c);
+	}
+
+	return [hwb[0], c * 100, g * 100];
+};
+
+convert.apple.rgb = function (apple) {
+	return [(apple[0] / 65535) * 255, (apple[1] / 65535) * 255, (apple[2] / 65535) * 255];
+};
+
+convert.rgb.apple = function (rgb) {
+	return [(rgb[0] / 255) * 65535, (rgb[1] / 255) * 65535, (rgb[2] / 255) * 65535];
+};
+
+convert.gray.rgb = function (args) {
+	return [args[0] / 100 * 255, args[0] / 100 * 255, args[0] / 100 * 255];
+};
+
+convert.gray.hsl = function (args) {
+	return [0, 0, args[0]];
+};
+
+convert.gray.hsv = convert.gray.hsl;
+
+convert.gray.hwb = function (gray) {
+	return [0, 100, gray[0]];
+};
+
+convert.gray.cmyk = function (gray) {
+	return [0, 0, 0, gray[0]];
+};
+
+convert.gray.lab = function (gray) {
+	return [gray[0], 0, 0];
+};
+
+convert.gray.hex = function (gray) {
+	const val = Math.round(gray[0] / 100 * 255) & 0xFF;
+	const integer = (val << 16) + (val << 8) + val;
+
+	const string = integer.toString(16).toUpperCase();
+	return '000000'.substring(string.length) + string;
+};
+
+convert.rgb.gray = function (rgb) {
+	const val = (rgb[0] + rgb[1] + rgb[2]) / 3;
+	return [val / 255 * 100];
+};

extracted-source/node_modules/color-convert/index.js

@@ -0,0 +1,81 @@
+const conversions = require('./conversions');
+const route = require('./route');
+
+const convert = {};
+
+const models = Object.keys(conversions);
+
+function wrapRaw(fn) {
+	const wrappedFn = function (...args) {
+		const arg0 = args[0];
+		if (arg0 === undefined || arg0 === null) {
+			return arg0;
+		}
+
+		if (arg0.length > 1) {
+			args = arg0;
+		}
+
+		return fn(args);
+	};
+
+	// Preserve .conversion property if there is one
+	if ('conversion' in fn) {
+		wrappedFn.conversion = fn.conversion;
+	}
+
+	return wrappedFn;
+}
+
+function wrapRounded(fn) {
+	const wrappedFn = function (...args) {
+		const arg0 = args[0];
+
+		if (arg0 === undefined || arg0 === null) {
+			return arg0;
+		}
+
+		if (arg0.length > 1) {
+			args = arg0;
+		}
+
+		const result = fn(args);
+
+		// We're assuming the result is an array here.
+		// see notice in conversions.js; don't use box types
+		// in conversion functions.
+		if (typeof result === 'object') {
+			for (let len = result.length, i = 0; i < len; i++) {
+				result[i] = Math.round(result[i]);
+			}
+		}
+
+		return result;
+	};
+
+	// Preserve .conversion property if there is one
+	if ('conversion' in fn) {
+		wrappedFn.conversion = fn.conversion;
+	}
+
+	return wrappedFn;
+}
+
+models.forEach(fromModel => {
+	convert[fromModel] = {};
+
+	Object.defineProperty(convert[fromModel], 'channels', {value: conversions[fromModel].channels});
+	Object.defineProperty(convert[fromModel], 'labels', {value: conversions[fromModel].labels});
+
+	const routes = route(fromModel);
+	const routeModels = Object.keys(routes);
+
+	routeModels.forEach(toModel => {
+		const fn = routes[toModel];
+
+		convert[fromModel][toModel] = wrapRounded(fn);
+		convert[fromModel][toModel].raw = wrapRaw(fn);
+	});
+});
+
+module.exports = convert;

extracted-source/node_modules/color-convert/route.js

@@ -0,0 +1,97 @@
+const conversions = require('./conversions');
+
+/*
+	This function routes a model to all other models.
+
+	all functions that are routed have a property `.conversion` attached
+	to the returned synthetic function. This property is an array
+	of strings, each with the steps in between the 'from' and 'to'
+	color models (inclusive).
+
+	conversions that are not possible simply are not included.
+*/
+
+function buildGraph() {
+	const graph = {};
+	// https://jsperf.com/object-keys-vs-for-in-with-closure/3
+	const models = Object.keys(conversions);
+
+	for (let len = models.length, i = 0; i < len; i++) {
+		graph[models[i]] = {
+			// http://jsperf.com/1-vs-infinity
+			// micro-opt, but this is simple.
+			distance: -1,
+			parent: null
+		};
+	}
+
+	return graph;
+}
+
+// https://en.wikipedia.org/wiki/Breadth-first_search
+function deriveBFS(fromModel) {
+	const graph = buildGraph();
+	const queue = [fromModel]; // Unshift -> queue -> pop
+
+	graph[fromModel].distance = 0;
+
+	while (queue.length) {
+		const current = queue.pop();
+		const adjacents = Object.keys(conversions[current]);
+
+		for (let len = adjacents.length, i = 0; i < len; i++) {
+			const adjacent = adjacents[i];
+			const node = graph[adjacent];
+
+			if (node.distance === -1) {
+				node.distance = graph[current].distance + 1;
+				node.parent = current;
+				queue.unshift(adjacent);
+			}
+		}
+	}
+
+	return graph;
+}
+
+function link(from, to) {
+	return function (args) {
+		return to(from(args));
+	};
+}
+
+function wrapConversion(toModel, graph) {
+	const path = [graph[toModel].parent, toModel];
+	let fn = conversions[graph[toModel].parent][toModel];
+
+	let cur = graph[toModel].parent;
+	while (graph[cur].parent) {
+		path.unshift(graph[cur].parent);
+		fn = link(conversions[graph[cur].parent][cur], fn);
+		cur = graph[cur].parent;
+	}
+
+	fn.conversion = path;
+	return fn;
+}
+
+module.exports = function (fromModel) {
+	const graph = deriveBFS(fromModel);
+	const conversion = {};
+
+	const models = Object.keys(graph);
+	for (let len = models.length, i = 0; i < len; i++) {
+		const toModel = models[i];
+		const node = graph[toModel];
+
+		if (node.parent === null) {
+			// No possible conversion, or this node is the source model.
+			continue;
+		}
+
+		conversion[toModel] = wrapConversion(toModel, graph);
+	}
+
+	return conversion;
+};
+