polished/lib/color/parseToRgb.js

A lightweight toolset for writing styles in Javascript.

"use strict";

exports.__esModule = true;
exports["default"] = parseToRgb;
var _hslToRgb = _interopRequireDefault(require("../internalHelpers/_hslToRgb"));
var _nameToHex = _interopRequireDefault(require("../internalHelpers/_nameToHex"));
var _errors = _interopRequireDefault(require("../internalHelpers/_errors"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
var hexRegex = /^#[a-fA-F0-9]{6}$/;
var hexRgbaRegex = /^#[a-fA-F0-9]{8}$/;
var reducedHexRegex = /^#[a-fA-F0-9]{3}$/;
var reducedRgbaHexRegex = /^#[a-fA-F0-9]{4}$/;
var rgbRegex = /^rgb\(\s*(\d{1,3})\s*(?:,)?\s*(\d{1,3})\s*(?:,)?\s*(\d{1,3})\s*\)$/i;
var rgbaRegex = /^rgb(?:a)?\(\s*(\d{1,3})\s*(?:,)?\s*(\d{1,3})\s*(?:,)?\s*(\d{1,3})\s*(?:,|\/)\s*([-+]?\d*[.]?\d+[%]?)\s*\)$/i;
var hslRegex = /^hsl\(\s*(\d{0,3}[.]?[0-9]+(?:deg)?)\s*(?:,)?\s*(\d{1,3}[.]?[0-9]?)%\s*(?:,)?\s*(\d{1,3}[.]?[0-9]?)%\s*\)$/i;
var hslaRegex = /^hsl(?:a)?\(\s*(\d{0,3}[.]?[0-9]+(?:deg)?)\s*(?:,)?\s*(\d{1,3}[.]?[0-9]?)%\s*(?:,)?\s*(\d{1,3}[.]?[0-9]?)%\s*(?:,|\/)\s*([-+]?\d*[.]?\d+[%]?)\s*\)$/i;

/**
 * Returns an RgbColor or RgbaColor object. This utility function is only useful
 * if want to extract a color component. With the color util `toColorString` you
 * can convert a RgbColor or RgbaColor object back to a string.
 *
 * @example
 * // Assigns `{ red: 255, green: 0, blue: 0 }` to color1
 * const color1 = parseToRgb('rgb(255, 0, 0)');
 * // Assigns `{ red: 92, green: 102, blue: 112, alpha: 0.75 }` to color2
 * const color2 = parseToRgb('hsla(210, 10%, 40%, 0.75)');
 */
function parseToRgb(color) {
  if (typeof color !== 'string') {
    throw new _errors["default"](3);
  }
  var normalizedColor = (0, _nameToHex["default"])(color);
  if (normalizedColor.match(hexRegex)) {
    return {
      red: parseInt("" + normalizedColor[1] + normalizedColor[2], 16),
      green: parseInt("" + normalizedColor[3] + normalizedColor[4], 16),
      blue: parseInt("" + normalizedColor[5] + normalizedColor[6], 16)
    };
  }
  if (normalizedColor.match(hexRgbaRegex)) {
    var alpha = parseFloat((parseInt("" + normalizedColor[7] + normalizedColor[8], 16) / 255).toFixed(2));
    return {
      red: parseInt("" + normalizedColor[1] + normalizedColor[2], 16),
      green: parseInt("" + normalizedColor[3] + normalizedColor[4], 16),
      blue: parseInt("" + normalizedColor[5] + normalizedColor[6], 16),
      alpha: alpha
    };
  }
  if (normalizedColor.match(reducedHexRegex)) {
    return {
      red: parseInt("" + normalizedColor[1] + normalizedColor[1], 16),
      green: parseInt("" + normalizedColor[2] + normalizedColor[2], 16),
      blue: parseInt("" + normalizedColor[3] + normalizedColor[3], 16)
    };
  }
  if (normalizedColor.match(reducedRgbaHexRegex)) {
    var _alpha = parseFloat((parseInt("" + normalizedColor[4] + normalizedColor[4], 16) / 255).toFixed(2));
    return {
      red: parseInt("" + normalizedColor[1] + normalizedColor[1], 16),
      green: parseInt("" + normalizedColor[2] + normalizedColor[2], 16),
      blue: parseInt("" + normalizedColor[3] + normalizedColor[3], 16),
      alpha: _alpha
    };
  }
  var rgbMatched = rgbRegex.exec(normalizedColor);
  if (rgbMatched) {
    return {
      red: parseInt("" + rgbMatched[1], 10),
      green: parseInt("" + rgbMatched[2], 10),
      blue: parseInt("" + rgbMatched[3], 10)
    };
  }
  var rgbaMatched = rgbaRegex.exec(normalizedColor.substring(0, 50));
  if (rgbaMatched) {
    return {
      red: parseInt("" + rgbaMatched[1], 10),
      green: parseInt("" + rgbaMatched[2], 10),
      blue: parseInt("" + rgbaMatched[3], 10),
      alpha: parseFloat("" + rgbaMatched[4]) > 1 ? parseFloat("" + rgbaMatched[4]) / 100 : parseFloat("" + rgbaMatched[4])
    };
  }
  var hslMatched = hslRegex.exec(normalizedColor);
  if (hslMatched) {
    var hue = parseInt("" + hslMatched[1], 10);
    var saturation = parseInt("" + hslMatched[2], 10) / 100;
    var lightness = parseInt("" + hslMatched[3], 10) / 100;
    var rgbColorString = "rgb(" + (0, _hslToRgb["default"])(hue, saturation, lightness) + ")";
    var hslRgbMatched = rgbRegex.exec(rgbColorString);
    if (!hslRgbMatched) {
      throw new _errors["default"](4, normalizedColor, rgbColorString);
    }
    return {
      red: parseInt("" + hslRgbMatched[1], 10),
      green: parseInt("" + hslRgbMatched[2], 10),
      blue: parseInt("" + hslRgbMatched[3], 10)
    };
  }
  var hslaMatched = hslaRegex.exec(normalizedColor.substring(0, 50));
  if (hslaMatched) {
    var _hue = parseInt("" + hslaMatched[1], 10);
    var _saturation = parseInt("" + hslaMatched[2], 10) / 100;
    var _lightness = parseInt("" + hslaMatched[3], 10) / 100;
    var _rgbColorString = "rgb(" + (0, _hslToRgb["default"])(_hue, _saturation, _lightness) + ")";
    var _hslRgbMatched = rgbRegex.exec(_rgbColorString);
    if (!_hslRgbMatched) {
      throw new _errors["default"](4, normalizedColor, _rgbColorString);
    }
    return {
      red: parseInt("" + _hslRgbMatched[1], 10),
      green: parseInt("" + _hslRgbMatched[2], 10),
      blue: parseInt("" + _hslRgbMatched[3], 10),
      alpha: parseFloat("" + hslaMatched[4]) > 1 ? parseFloat("" + hslaMatched[4]) / 100 : parseFloat("" + hslaMatched[4])
    };
  }
  throw new _errors["default"](5);
}
module.exports = exports.default;