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Filename : index.js
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//
// Copyright (C) 2012 - 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/>.

// an extraction of the deparam method from Ben Alman's jQuery BBQ
// http://benalman.com/projects/jquery-bbq-plugin/

import unflatten from 'obj-unflatten'

const coerceTypes = {
  true: true,
  false: false,
  null: null
}

export default function deparam(params, coerce) {
  // shortcut for just deparam'ing the current querystring
  if (!params || typeof params === 'boolean') {
    const currentQueryString = window.location.search
    if (!currentQueryString) return {}
    return deparam(currentQueryString, ...arguments)
  }

  const obj = {}
  params
    .replace(/\+/g, ' ')
    .split('&')
    .forEach(param => {
      let [key, val] = param.split('=')
      key = decodeURIComponent(key)
      val = decodeURIComponent(val)

      // coerce values.
      if (coerce) {
        val =
          val && !isNaN(val)
            ? +val // number
            : val === 'undefined'
            ? undefined // undefined
            : coerceTypes[val] !== undefined
            ? coerceTypes[val] // true, false, null
            : val // string
      }

      obj[key] = val
    })

  return unflatten(obj)
}