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File: public/js/tinymce/src/core/src/main/js/util/Color.js

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/**
 * Color.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * This class lets you parse/serialize colors and convert rgb/hsb.
 *
 * @class tinymce.util.Color
 * @example
 * var white = new tinymce.util.Color({r: 255, g: 255, b: 255});
 * var red = new tinymce.util.Color('#FF0000');
 *
 * console.log(white.toHex(), red.toHsv());
 */
define(
  'tinymce.core.util.Color',
  [
  ],
  function () {
    var min = Math.min, max = Math.max, round = Math.round;

    /**
     * Constructs a new color instance.
     *
     * @constructor
     * @method Color
     * @param {String} value Optional initial value to parse.
     */
    var Color = function (value) {
      var self = this, r = 0, g = 0, b = 0;

      var rgb2hsv = function (r, g, b) {
        var h, s, v, d, minRGB, maxRGB;

        h = 0;
        s = 0;
        v = 0;
        r = r / 255;
        g = g / 255;
        b = b / 255;

        minRGB = min(r, min(g, b));
        maxRGB = max(r, max(g, b));

        if (minRGB == maxRGB) {
          v = minRGB;

          return {
            h: 0,
            s: 0,
            v: v * 100
          };
        }

        /*eslint no-nested-ternary:0 */
        d = (r == minRGB) ? g - b : ((b == minRGB) ? r - g : b - r);
        h = (r == minRGB) ? 3 : ((b == minRGB) ? 1 : 5);
        h = 60 * (h - d / (maxRGB - minRGB));
        s = (maxRGB - minRGB) / maxRGB;
        v = maxRGB;

        return {
          h: round(h),
          s: round(s * 100),
          v: round(v * 100)
        };
      };

      var hsvToRgb = function (hue, saturation, brightness) {
        var side, chroma, x, match;

        hue = (parseInt(hue, 10) || 0) % 360;
        saturation = parseInt(saturation, 10) / 100;
        brightness = parseInt(brightness, 10) / 100;
        saturation = max(0, min(saturation, 1));
        brightness = max(0, min(brightness, 1));

        if (saturation === 0) {
          r = g = b = round(255 * brightness);
          return;
        }

        side = hue / 60;
        chroma = brightness * saturation;
        x = chroma * (1 - Math.abs(side % 2 - 1));
        match = brightness - chroma;

        switch (Math.floor(side)) {
          case 0:
            r = chroma;
            g = x;
            b = 0;
            break;

          case 1:
            r = x;
            g = chroma;
            b = 0;
            break;

          case 2:
            r = 0;
            g = chroma;
            b = x;
            break;

          case 3:
            r = 0;
            g = x;
            b = chroma;
            break;

          case 4:
            r = x;
            g = 0;
            b = chroma;
            break;

          case 5:
            r = chroma;
            g = 0;
            b = x;
            break;

          default:
            r = g = b = 0;
        }

        r = round(255 * (r + match));
        g = round(255 * (g + match));
        b = round(255 * (b + match));
      };

      /**
       * Returns the hex string of the current color. For example: #ff00ff
       *
       * @method toHex
       * @return {String} Hex string of current color.
       */
      var toHex = function () {
        var hex = function (val) {
          val = parseInt(val, 10).toString(16);

          return val.length > 1 ? val : '0' + val;
        };

        return '#' + hex(r) + hex(g) + hex(b);
      };

      /**
       * Returns the r, g, b values of the color. Each channel has a range from 0-255.
       *
       * @method toRgb
       * @return {Object} Object with r, g, b fields.
       */
      var toRgb = function () {
        return {
          r: r,
          g: g,
          b: b
        };
      };

      /**
       * Returns the h, s, v values of the color. Ranges: h=0-360, s=0-100, v=0-100.
       *
       * @method toHsv
       * @return {Object} Object with h, s, v fields.
       */
      var toHsv = function () {
        return rgb2hsv(r, g, b);
      };

      /**
       * Parses the specified value and populates the color instance.
       *
       * Supported format examples:
       *  * rbg(255,0,0)
       *  * #ff0000
       *  * #fff
       *  * {r: 255, g: 0, b: 0}
       *  * {h: 360, s: 100, v: 100}
       *
       * @method parse
       * @param {Object/String} value Color value to parse.
       * @return {tinymce.util.Color} Current color instance.
       */
      var parse = function (value) {
        var matches;

        if (typeof value == 'object') {
          if ("r" in value) {
            r = value.r;
            g = value.g;
            b = value.b;
          } else if ("v" in value) {
            hsvToRgb(value.h, value.s, value.v);
          }
        } else {
          if ((matches = /rgb\s*\(\s*([0-9]+)\s*,\s*([0-9]+)\s*,\s*([0-9]+)[^\)]*\)/gi.exec(value))) {
            r = parseInt(matches[1], 10);
            g = parseInt(matches[2], 10);
            b = parseInt(matches[3], 10);
          } else if ((matches = /#([0-F]{2})([0-F]{2})([0-F]{2})/gi.exec(value))) {
            r = parseInt(matches[1], 16);
            g = parseInt(matches[2], 16);
            b = parseInt(matches[3], 16);
          } else if ((matches = /#([0-F])([0-F])([0-F])/gi.exec(value))) {
            r = parseInt(matches[1] + matches[1], 16);
            g = parseInt(matches[2] + matches[2], 16);
            b = parseInt(matches[3] + matches[3], 16);
          }
        }

        r = r < 0 ? 0 : (r > 255 ? 255 : r);
        g = g < 0 ? 0 : (g > 255 ? 255 : g);
        b = b < 0 ? 0 : (b > 255 ? 255 : b);

        return self;
      };

      if (value) {
        parse(value);
      }

      self.toRgb = toRgb;
      self.toHsv = toHsv;
      self.toHex = toHex;
      self.parse = parse;
    };

    return Color;
  }
);
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