# all files / ol/ color.js

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     goog.provide('ol.color');

    goog.require('ol.asserts');
    goog.require('ol.math');

    /**
     * This RegExp matches # followed by 3 or 6 hex digits.
     * @const
     * @type {RegExp}
     * @private
     */
    ol.color.HEX_COLOR_RE_ = /^#(?:[0-9a-f]{3}){1,2}$/i;

    /**
     * Regular expression for matching potential named color style strings.
     * @const
     * @type {RegExp}
     * @private
     */
    ol.color.NAMED_COLOR_RE_ = /^([a-z]*)$/i;

    /**
     * Return the color as an array. This function maintains a cache of calculated
     * arrays which means the result should not be modified.
     * @param {ol.Color|string} color Color.
     * @return {ol.Color} Color.
     * @api
     */
    ol.color.asArray = function(color) {
      if (Array.isArray(color)) {
        return color;
      } else {
        return ol.color.fromString(/** @type {string} */ (color));
      }
    };

    /**
     * Return the color as an rgba string.
     * @param {ol.Color|string} color Color.
     * @return {string} Rgba string.
     * @api
     */
    ol.color.asString = function(color) {
      if (typeof color === 'string') {
        return color;
      } else {
        return ol.color.toString(color);
      }
    };

    /**
     * Return named color as an rgba string.
     * @param {string} color Named color.
     * @return {string} Rgb string.
     */
    ol.color.fromNamed = function(color) {
      var el = document.createElement('div');
      el.style.color = color;
      document.body.appendChild(el);
      var rgb = getComputedStyle(el).color;
      document.body.removeChild(el);
      return rgb;
    };

    /**
     * @param {string} s String.
     * @return {ol.Color} Color.
     */
    ol.color.fromString = (
      function() {

        // We maintain a small cache of parsed strings.  To provide cheap LRU-like
        // semantics, whenever the cache grows too large we simply delete an
        // arbitrary 25% of the entries.

        /**
         * @const
         * @type {number}
         */
        var MAX_CACHE_SIZE = 1024;

        /**
         * @type {Object.<string, ol.Color>}
         */
        var cache = {};

        /**
         * @type {number}
         */
        var cacheSize = 0;

        return (
          /**
           * @param {string} s String.
           * @return {ol.Color} Color.
           */
          function(s) {
            var color;
            if (cache.hasOwnProperty(s)) {
              color = cache[s];
            } else {
              if (cacheSize >= MAX_CACHE_SIZE) {
                var i = 0;
                var key;
                for (key in cache) {
                  if ((i++ & 3) === 0) {
                    delete cache[key];
                    --cacheSize;
                  }
                }
              }
              color = ol.color.fromStringInternal_(s);
              cache[s] = color;
              ++cacheSize;
            }
            return color;
          });

      })();

    /**
     * @param {string} s String.
     * @private
     * @return {ol.Color} Color.
     */
    ol.color.fromStringInternal_ = function(s) {
      var r, g, b, a, color, parts;

      if (ol.color.NAMED_COLOR_RE_.exec(s)) {
        s = ol.color.fromNamed(s);
      }

      if (ol.color.HEX_COLOR_RE_.exec(s)) { // hex
        var n = s.length - 1; // number of hex digits
        ol.asserts.assert(n == 3 || n == 6, 54); // Hex color should have 3 or 6 digits
        var d = n == 3 ? 1 : 2; // number of digits per channel
        r = parseInt(s.substr(1 + 0 * d, d), 16);
        g = parseInt(s.substr(1 + 1 * d, d), 16);
        b = parseInt(s.substr(1 + 2 * d, d), 16);
        if (d == 1) {
          r = (r << 4) + r;
          g = (g << 4) + g;
          b = (b << 4) + b;
        }
        a = 1;
        color = [r, g, b, a];
      } else if (s.indexOf('rgba(') == 0) { // rgba()
        parts = s.slice(5, -1).split(',').map(Number);
        color = ol.color.normalize(parts);
      } else if (s.indexOf('rgb(') == 0) { // rgb()
        parts = s.slice(4, -1).split(',').map(Number);
        parts.push(1);
        color = ol.color.normalize(parts);
      } else {
        ol.asserts.assert(false, 14); // Invalid color
      }
      return /** @type {ol.Color} */ (color);
    };

    /**
     * @param {ol.Color} color Color.
     * @param {ol.Color=} opt_color Color.
     * @return {ol.Color} Clamped color.
     */
    ol.color.normalize = function(color, opt_color) {
      var result = opt_color || [];
      result[0] = ol.math.clamp((color[0] + 0.5) | 0, 0, 255);
      result[1] = ol.math.clamp((color[1] + 0.5) | 0, 0, 255);
      result[2] = ol.math.clamp((color[2] + 0.5) | 0, 0, 255);
      result[3] = ol.math.clamp(color[3], 0, 1);
      return result;
    };

    /**
     * @param {ol.Color} color Color.
     * @return {string} String.
     */
    ol.color.toString = function(color) {
      var r = color[0];
      if (r != (r | 0)) {
        r = (r + 0.5) | 0;
      }
      var g = color[1];
      if (g != (g | 0)) {
        g = (g + 0.5) | 0;
      }
      var b = color[2];
      if (b != (b | 0)) {
        b = (b + 0.5) | 0;
      }
      var a = color[3] === undefined ? 1 : color[3];
      return 'rgba(' + r + ',' + g + ',' + b + ',' + a + ')';
    };