130 lines
2.8 KiB
JavaScript
130 lines
2.8 KiB
JavaScript
'use strict';
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var colornames = require('colornames');
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/**
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* Kuler: Color text using CSS colors
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*
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* @constructor
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* @param {String} text The text that needs to be styled
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* @param {String} color Optional color for alternate API.
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* @api public
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*/
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function Kuler(text, color) {
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if (color) return (new Kuler(text)).style(color);
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if (!(this instanceof Kuler)) return new Kuler(text);
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this.text = text;
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}
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/**
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* ANSI color codes.
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*
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* @type {String}
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* @private
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*/
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Kuler.prototype.prefix = '\x1b[';
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Kuler.prototype.suffix = 'm';
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/**
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* Parse a hex color string and parse it to it's RGB equiv.
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*
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* @param {String} color
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* @returns {Array}
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* @api private
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*/
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Kuler.prototype.hex = function hex(color) {
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color = color[0] === '#' ? color.substring(1) : color;
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//
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// Pre-parse for shorthand hex colors.
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//
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if (color.length === 3) {
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color = color.split('');
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color[5] = color[2]; // F60##0
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color[4] = color[2]; // F60#00
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color[3] = color[1]; // F60600
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color[2] = color[1]; // F66600
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color[1] = color[0]; // FF6600
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color = color.join('');
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}
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var r = color.substring(0, 2)
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, g = color.substring(2, 4)
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, b = color.substring(4, 6);
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return [ parseInt(r, 16), parseInt(g, 16), parseInt(b, 16) ];
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};
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/**
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* Transform a 255 RGB value to an RGV code.
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*
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* @param {Number} r Red color channel.
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* @param {Number} g Green color channel.
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* @param {Number} b Blue color channel.
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* @returns {String}
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* @api public
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*/
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Kuler.prototype.rgb = function rgb(r, g, b) {
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var red = r / 255 * 5
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, green = g / 255 * 5
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, blue = b / 255 * 5;
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return this.ansi(red, green, blue);
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};
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/**
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* Turns RGB 0-5 values into a single ANSI code.
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*
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* @param {Number} r Red color channel.
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* @param {Number} g Green color channel.
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* @param {Number} b Blue color channel.
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* @returns {String}
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* @api public
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*/
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Kuler.prototype.ansi = function ansi(r, g, b) {
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var red = Math.round(r)
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, green = Math.round(g)
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, blue = Math.round(b);
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return 16 + (red * 36) + (green * 6) + blue;
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};
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/**
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* Marks an end of color sequence.
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*
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* @returns {String} Reset sequence.
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* @api public
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*/
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Kuler.prototype.reset = function reset() {
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return this.prefix +'39;49'+ this.suffix;
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};
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/**
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* Colour the terminal using CSS.
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*
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* @param {String} color The HEX color code.
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* @returns {String} the escape code.
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* @api public
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*/
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Kuler.prototype.style = function style(color) {
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//
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// We've been supplied a CSS color name instead of a hex color format so we
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// need to transform it to proper CSS color and continue with our execution
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// flow.
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//
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if (!/^#?(?:[0-9a-fA-F]{3}){1,2}$/.test(color)) {
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color = colornames(color);
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}
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return this.prefix +'38;5;'+ this.rgb.apply(this, this.hex(color)) + this.suffix + this.text + this.reset();
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};
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//
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// Expose the actual interface.
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//
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module.exports = Kuler;
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