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Merge pull request #58 from segayuu/Add-Color
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Add Color class from tagcloud hexo helper
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@segayuu
segayuu authored Aug 7, 2019
2 parents ab30d63 + 6d9df36 commit 52820ac
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336 changes: 336 additions & 0 deletions lib/color.js
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'use strict';

// https://github.com/imathis/hsl-picker/blob/master/assets/javascripts/modules/color.coffee
const rHex3 = /^#[0-9a-f]{3}$/;
const rHex6 = /^#[0-9a-f]{6}$/;
const rRGB = /^rgba?\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,?\s*(0?\.?\d+)?\s*\)$/;
const rHSL = /^hsla?\(\s*(\d{1,3})\s*,\s*(\d{1,3})%\s*,\s*(\d{1,3})%\s*,?\s*(0?\.?\d+)?\s*\)$/;

// https://www.w3.org/TR/css3-color/#svg-color
const colorNames = {
aliceblue: {r: 240, g: 248, b: 255, a: 1},
antiquewhite: {r: 250, g: 235, b: 215, a: 1},
aqua: {r: 0, g: 255, b: 255, a: 1},
aquamarine: {r: 127, g: 255, b: 212, a: 1},
azure: {r: 240, g: 255, b: 255, a: 1},
beige: {r: 245, g: 245, b: 220, a: 1},
bisque: {r: 255, g: 228, b: 196, a: 1},
black: {r: 0, g: 0, b: 0, a: 1},
blanchedalmond: {r: 255, g: 235, b: 205, a: 1},
blue: {r: 0, g: 0, b: 255, a: 1},
blueviolet: {r: 138, g: 43, b: 226, a: 1},
brown: {r: 165, g: 42, b: 42, a: 1},
burlywood: {r: 222, g: 184, b: 135, a: 1},
cadetblue: {r: 95, g: 158, b: 160, a: 1},
chartreuse: {r: 127, g: 255, b: 0, a: 1},
chocolate: {r: 210, g: 105, b: 30, a: 1},
coral: {r: 255, g: 127, b: 80, a: 1},
cornflowerblue: {r: 100, g: 149, b: 237, a: 1},
cornsilk: {r: 255, g: 248, b: 220, a: 1},
crimson: {r: 220, g: 20, b: 60, a: 1},
cyan: {r: 0, g: 255, b: 255, a: 1},
darkblue: {r: 0, g: 0, b: 139, a: 1},
darkcyan: {r: 0, g: 139, b: 139, a: 1},
darkgoldenrod: {r: 184, g: 134, b: 11, a: 1},
darkgray: {r: 169, g: 169, b: 169, a: 1},
darkgreen: {r: 0, g: 100, b: 0, a: 1},
darkgrey: {r: 169, g: 169, b: 169, a: 1},
darkkhaki: {r: 189, g: 183, b: 107, a: 1},
darkmagenta: {r: 139, g: 0, b: 139, a: 1},
darkolivegreen: {r: 85, g: 107, b: 47, a: 1},
darkorange: {r: 255, g: 140, b: 0, a: 1},
darkorchid: {r: 153, g: 50, b: 204, a: 1},
darkred: {r: 139, g: 0, b: 0, a: 1},
darksalmon: {r: 233, g: 150, b: 122, a: 1},
darkseagreen: {r: 143, g: 188, b: 143, a: 1},
darkslateblue: {r: 72, g: 61, b: 139, a: 1},
darkslategray: {r: 47, g: 79, b: 79, a: 1},
darkslategrey: {r: 47, g: 79, b: 79, a: 1},
darkturquoise: {r: 0, g: 206, b: 209, a: 1},
darkviolet: {r: 148, g: 0, b: 211, a: 1},
deeppink: {r: 255, g: 20, b: 147, a: 1},
deepskyblue: {r: 0, g: 191, b: 255, a: 1},
dimgray: {r: 105, g: 105, b: 105, a: 1},
dimgrey: {r: 105, g: 105, b: 105, a: 1},
dodgerblue: {r: 30, g: 144, b: 255, a: 1},
firebrick: {r: 178, g: 34, b: 34, a: 1},
floralwhite: {r: 255, g: 250, b: 240, a: 1},
forestgreen: {r: 34, g: 139, b: 34, a: 1},
fuchsia: {r: 255, g: 0, b: 255, a: 1},
gainsboro: {r: 220, g: 220, b: 220, a: 1},
ghostwhite: {r: 248, g: 248, b: 255, a: 1},
gold: {r: 255, g: 215, b: 0, a: 1},
goldenrod: {r: 218, g: 165, b: 32, a: 1},
gray: {r: 128, g: 128, b: 128, a: 1},
green: {r: 0, g: 128, b: 0, a: 1},
greenyellow: {r: 173, g: 255, b: 47, a: 1},
grey: {r: 128, g: 128, b: 128, a: 1},
honeydew: {r: 240, g: 255, b: 240, a: 1},
hotpink: {r: 255, g: 105, b: 180, a: 1},
indianred: {r: 205, g: 92, b: 92, a: 1},
indigo: {r: 75, g: 0, b: 130, a: 1},
ivory: {r: 255, g: 255, b: 240, a: 1},
khaki: {r: 240, g: 230, b: 140, a: 1},
lavender: {r: 230, g: 230, b: 250, a: 1},
lavenderblush: {r: 255, g: 240, b: 245, a: 1},
lawngreen: {r: 124, g: 252, b: 0, a: 1},
lemonchiffon: {r: 255, g: 250, b: 205, a: 1},
lightblue: {r: 173, g: 216, b: 230, a: 1},
lightcoral: {r: 240, g: 128, b: 128, a: 1},
lightcyan: {r: 224, g: 255, b: 255, a: 1},
lightgoldenrodyellow: {r: 250, g: 250, b: 210, a: 1},
lightgray: {r: 211, g: 211, b: 211, a: 1},
lightgreen: {r: 144, g: 238, b: 144, a: 1},
lightgrey: {r: 211, g: 211, b: 211, a: 1},
lightpink: {r: 255, g: 182, b: 193, a: 1},
lightsalmon: {r: 255, g: 160, b: 122, a: 1},
lightseagreen: {r: 32, g: 178, b: 170, a: 1},
lightskyblue: {r: 135, g: 206, b: 250, a: 1},
lightslategray: {r: 119, g: 136, b: 153, a: 1},
lightslategrey: {r: 119, g: 136, b: 153, a: 1},
lightsteelblue: {r: 176, g: 196, b: 222, a: 1},
lightyellow: {r: 255, g: 255, b: 224, a: 1},
lime: {r: 0, g: 255, b: 0, a: 1},
limegreen: {r: 50, g: 205, b: 50, a: 1},
linen: {r: 250, g: 240, b: 230, a: 1},
magenta: {r: 255, g: 0, b: 255, a: 1},
maroon: {r: 128, g: 0, b: 0, a: 1},
mediumaquamarine: {r: 102, g: 205, b: 170, a: 1},
mediumblue: {r: 0, g: 0, b: 205, a: 1},
mediumorchid: {r: 186, g: 85, b: 211, a: 1},
mediumpurple: {r: 147, g: 112, b: 219, a: 1},
mediumseagreen: {r: 60, g: 179, b: 113, a: 1},
mediumslateblue: {r: 123, g: 104, b: 238, a: 1},
mediumspringgreen: {r: 0, g: 250, b: 154, a: 1},
mediumturquoise: {r: 72, g: 209, b: 204, a: 1},
mediumvioletred: {r: 199, g: 21, b: 133, a: 1},
midnightblue: {r: 25, g: 25, b: 112, a: 1},
mintcream: {r: 245, g: 255, b: 250, a: 1},
mistyrose: {r: 255, g: 228, b: 225, a: 1},
moccasin: {r: 255, g: 228, b: 181, a: 1},
navajowhite: {r: 255, g: 222, b: 173, a: 1},
navy: {r: 0, g: 0, b: 128, a: 1},
oldlace: {r: 253, g: 245, b: 230, a: 1},
olive: {r: 128, g: 128, b: 0, a: 1},
olivedrab: {r: 107, g: 142, b: 35, a: 1},
orange: {r: 255, g: 165, b: 0, a: 1},
orangered: {r: 255, g: 69, b: 0, a: 1},
orchid: {r: 218, g: 112, b: 214, a: 1},
palegoldenrod: {r: 238, g: 232, b: 170, a: 1},
palegreen: {r: 152, g: 251, b: 152, a: 1},
paleturquoise: {r: 175, g: 238, b: 238, a: 1},
palevioletred: {r: 219, g: 112, b: 147, a: 1},
papayawhip: {r: 255, g: 239, b: 213, a: 1},
peachpuff: {r: 255, g: 218, b: 185, a: 1},
peru: {r: 205, g: 133, b: 63, a: 1},
pink: {r: 255, g: 192, b: 203, a: 1},
plum: {r: 221, g: 160, b: 221, a: 1},
powderblue: {r: 176, g: 224, b: 230, a: 1},
purple: {r: 128, g: 0, b: 128, a: 1},
red: {r: 255, g: 0, b: 0, a: 1},
rosybrown: {r: 188, g: 143, b: 143, a: 1},
royalblue: {r: 65, g: 105, b: 225, a: 1},
saddlebrown: {r: 139, g: 69, b: 19, a: 1},
salmon: {r: 250, g: 128, b: 114, a: 1},
sandybrown: {r: 244, g: 164, b: 96, a: 1},
seagreen: {r: 46, g: 139, b: 87, a: 1},
seashell: {r: 255, g: 245, b: 238, a: 1},
sienna: {r: 160, g: 82, b: 45, a: 1},
silver: {r: 192, g: 192, b: 192, a: 1},
skyblue: {r: 135, g: 206, b: 235, a: 1},
slateblue: {r: 106, g: 90, b: 205, a: 1},
slategray: {r: 112, g: 128, b: 144, a: 1},
slategrey: {r: 112, g: 128, b: 144, a: 1},
snow: {r: 255, g: 250, b: 250, a: 1},
springgreen: {r: 0, g: 255, b: 127, a: 1},
steelblue: {r: 70, g: 130, b: 180, a: 1},
tan: {r: 210, g: 180, b: 140, a: 1},
teal: {r: 0, g: 128, b: 128, a: 1},
thistle: {r: 216, g: 191, b: 216, a: 1},
tomato: {r: 255, g: 99, b: 71, a: 1},
turquoise: {r: 64, g: 224, b: 208, a: 1},
violet: {r: 238, g: 130, b: 238, a: 1},
wheat: {r: 245, g: 222, b: 179, a: 1},
white: {r: 255, g: 255, b: 255, a: 1},
whitesmoke: {r: 245, g: 245, b: 245, a: 1},
yellow: {r: 255, g: 255, b: 0, a: 1},
yellowgreen: {r: 154, g: 205, b: 50, a: 1}
};

const convertHue = (p, q, h) => {
if (h < 0) h++;
if (h > 1) h--;

let color;

if (h * 6 < 1) {
color = p + ((q - p) * h * 6);
} else if (h * 2 < 1) {
color = q;
} else if (h * 3 < 2) {
color = p + ((q - p) * ((2 / 3) - h) * 6);
} else {
color = p;
}

return Math.round(color * 255);
};

const convertRGB = value => {
const str = value.toString(16);
if (value < 16) return `0${str}`;

return str;
};

const mixValue = (a, b, ratio) => a + ((b - a) * ratio);

class Color {

/**
* @param {string|{ r: number; g: number; b: number; a: number;}} color
*/
constructor(color) {
if (typeof color === 'string') {
this._parse(color);
} else if (color != null && typeof color === 'object') {
this.r = color.r | 0;
this.g = color.g | 0;
this.b = color.b | 0;
this.a = +color.a;
} else {
throw new TypeError('color is required!');
}

if (this.r < 0 || this.r > 255
|| this.g < 0 || this.g > 255
|| this.b < 0 || this.b > 255
|| this.a < 0 || this.a > 1) {
throw new RangeError(`{r: ${this.r}, g: ${this.g}, b: ${this.b}, a: ${this.a}} is invalid.`);
}
}

/**
* @param {string} color
*/
_parse(color) {
color = color.toLowerCase();

if (Object.prototype.hasOwnProperty.call(colorNames, color)) {
const obj = colorNames[color];

this.r = obj.r;
this.g = obj.g;
this.b = obj.b;
this.a = obj.a;

return;
}

if (rHex3.test(color)) {
const txt = color.substring(1);
const code = parseInt(txt, 16);

this.r = ((code & 0xF00) >> 8) * 17;
this.g = ((code & 0xF0) >> 4) * 17;
this.b = (code & 0xF) * 17;
this.a = 1;

return;
}

if (rHex6.test(color)) {
const txt = color.substring(1);
const code = parseInt(txt, 16);

this.r = (code & 0xFF0000) >> 16;
this.g = (code & 0xFF00) >> 8;
this.b = code & 0xFF;
this.a = 1;

return;
}

let match = color.match(rRGB);

if (match) {
this.r = match[1] | 0;
this.g = match[2] | 0;
this.b = match[3] | 0;
this.a = match[4] ? +match[4] : 1;

return;
}

match = color.match(rHSL);

if (match) {
const h = +match[1] / 360;
const s = +match[2] / 100;
const l = +match[3] / 100;

this.a = match[4] ? +match[4] : 1;

if (!s) {
this.r = this.g = this.b = l * 255;
}

const q = l < 0.5 ? l * (1 + s) : l + s - (l * s);
const p = (2 * l) - q;

const rt = h + (1 / 3);
const gt = h;
const bt = h - (1 / 3);

this.r = convertHue(p, q, rt);
this.g = convertHue(p, q, gt);
this.b = convertHue(p, q, bt);

return;
}

throw new Error(`${color} is not a supported color format.`);
}

toString() {
if (this.a === 1) {
const r = convertRGB(this.r);
const g = convertRGB(this.g);
const b = convertRGB(this.b);

if (this.r % 17 || this.g % 17 || this.b % 17) {
return `#${r}${g}${b}`;
}

return `#${r[0]}${g[0]}${b[0]}`;
}

return `rgba(${this.r}, ${this.g}, ${this.b}, ${parseFloat(this.a.toFixed(2))})`;
}

/**
* @param {string|{ r: number; g: number; b: number; a: number;}} color
* @param {number} ratio
*/
mix(color, ratio) {
if (ratio > 1 || ratio < 0) {
throw new RangeError('Valid numbers is only between 0 and 1.');
}
switch (ratio) {
case 0:
return new Color(this);

case 1:
return new Color(color);
}

return new Color({
r: Math.round(mixValue(this.r, color.r, ratio)),
g: Math.round(mixValue(this.g, color.g, ratio)),
b: Math.round(mixValue(this.b, color.b, ratio)),
a: mixValue(this.a, color.a, ratio)
});
}
}

module.exports = Color;
1 change: 1 addition & 0 deletions test/index.js
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describe('util', () => {
require('./scripts/cache_stream');
require('./scripts/camel_case_keys');
require('./scripts/color');
require('./scripts/escape_diacritic');
require('./scripts/escape_html');
require('./scripts/escape_regexp');
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53 changes: 53 additions & 0 deletions test/scripts/color.js
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'use strict';

describe('color', () => {
const Color = require('../../lib/color');

it('name', () => {
const red = new Color('red');
const pink = new Color('pink');
const mid1 = red.mix(pink, 1 / 3);
const mid2 = red.mix(pink, 2 / 3);

`${red}`.should.eql('#f00');
`${pink}`.should.eql('#ffc0cb');
`${mid1}`.should.eql('#ff4044');
`${mid2}`.should.eql('#ff8087');
});

it('hex', () => {
const red = new Color('#f00');
const pink = new Color('#ffc0cb');
const mid1 = red.mix(pink, 1 / 3);
const mid2 = red.mix(pink, 2 / 3);

`${red}`.should.eql('#f00');
`${pink}`.should.eql('#ffc0cb');
`${mid1}`.should.eql('#ff4044');
`${mid2}`.should.eql('#ff8087');
});

it('RGBA', () => {
const steelblueA = new Color('rgba(70, 130, 180, 0.3)');
const steelblue = new Color('rgb(70, 130, 180)');
const mid1 = steelblueA.mix(steelblue, 1 / 3);
const mid2 = steelblueA.mix(steelblue, 2 / 3);

`${steelblueA}`.should.eql('rgba(70, 130, 180, 0.3)');
`${steelblue}`.should.eql('#4682b4');
`${mid1}`.should.eql('rgba(70, 130, 180, 0.53)');
`${mid2}`.should.eql('rgba(70, 130, 180, 0.77)');
});

it('HSLA', () => {
const steelblueA = new Color('hsla(207, 44%, 49%, 0.3)');
const steelblue = new Color('hsl(207, 44%, 49%)');
const mid1 = steelblueA.mix(steelblue, 1 / 3);
const mid2 = steelblueA.mix(steelblue, 2 / 3);

`${steelblueA}`.should.eql('rgba(70, 130, 180, 0.3)');
`${steelblue}`.should.eql('#4682b4');
`${mid1}`.should.eql('rgba(70, 130, 180, 0.53)');
`${mid2}`.should.eql('rgba(70, 130, 180, 0.77)');
});
});

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