badgejs/lib/color.js

A JavaScript library for creating (status) badges.

'use strict';

/**
 * Define rgb color names
 */
const colors = {
    red: [ 232, 91, 65 ],
    orange: [ 242, 125, 62 ],
    yellow: [ 231, 186, 30 ],
    blue: [ 5, 133, 206 ],
    cyan: [ 25, 195, 212 ],
    green: [ 79, 207, 31 ],
    pink: [ 255, 105, 180 ],
    grey: [ 147, 147, 147 ],
    darkgrey: [ 54, 54, 54 ]
};

/**
 * Color constructor
 *
 * @constructor Color
 * @param {*} a Hex value, name, or red value
 * @param {number} b Green value
 * @param {number} c Blue value
 * @public
 */
function Color(a, b, c) {
    this.r = 0;
    this.g = 0;
    this.b = 0;

    if (typeof a == 'number') {
        if (typeof b != 'number'
            || typeof c != 'number')
            throw new TypeError('Expected numbers for all values');

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

    } else if (typeof a == 'string' && a.startsWith('#')) {

        let valid = a.length != 6;
        try {
            Buffer.from(a, 'hex');
        } catch(e) {
            valid = false;
        }

        if (!valid) throw new Error('Invalid hex value');

        let buffer = Buffer.from(a.substring(1), 'hex');
        this.r = buffer[0];
        this.g = buffer[1];
        this.b = buffer[2];

    } else if (typeof a == 'string') {
        let color = colors[a];
        if (!color) throw new Error(`Invalid color name '${a}'`);

        this.r = color[0];
        this.g = color[1];
        this.b = color[2];

    } else throw new TypeError(`Invalid type '${typeof a}'`);


    /**
     * Convert rgb values to CSS color value
     *
     * @method Color.toValue
     * @returns {string} CSS color value
     * @public
     */
    this.toValue = function toValue() {
        return `rgb(${this.r}, ${this.g}, ${this.b})`;
    }
}

module.exports.Color = Color;