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Filename : rgb2hex.js
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//
// Copyright (C) 2015 - present Instructure, Inc.
//
// This file is part of Canvas.
//
// Canvas is free software: you can redistribute it and/or modify it under
// the terms of the GNU Affero General Public License as published by the Free
// Software Foundation, version 3 of the License.
//
// Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.

// taken from http://jsfiddle.net/Mottie/xcqpF/1/light/
export default function rgb2hex(rgb) {
  rgb = rgb.match(/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?/i)
  if (rgb && rgb.length === 4) {
    return (
      '#' +
      ('0' + parseInt(rgb[1], 10).toString(16)).slice(-2) +
      ('0' + parseInt(rgb[2], 10).toString(16)).slice(-2) +
      ('0' + parseInt(rgb[3], 10).toString(16)).slice(-2)
    )
  } else {
    return ''
  }
}