get_query_params_as_object.coffee

re       = /([^&=]+)=?([^&]*)/g
decodeRE = /\+/g

decode = (str) -> decodeURIComponent(str.replace(decodeRE, " "))

assign = (obj, keyPath, value) ->
  for i in [0...keyPath.length]
    key      = keyPath[i]
    obj[key] = {} if !(key in obj)
    obj      = obj[key]
  obj[keyPath[lastKeyIndex]] = value
  return

window.getQueryParamsAsObject = (query = window.location.search) ->
  query = query.substring(query.indexOf('?') + 1)
  params = {}
  e

  while e = re.exec(query)
    k = decode(e[1])
    v = decode(e[2])
    if k.substring(k.length - 2) == '[]'
      k = k.substring(0, k.length - 2)
      (params[k] || (params[k] = [])).push(v)
    else
      params[k] = v

  for prop in params
    structure = prop.split('[')
    if structure.length > 1
      levels = []
      structure.forEach((item, i) ->
        key = item.replace(/[?[\]\\ ]/g, '')
        levels.push(key)
      )
      assign(params, levels, params[prop])
      delete(params[prop])

  return params

# query  = "?utf8=%E2%9C%93&q%5Bdate_range%5D=01.01.2022+-+10.07.2022&q%5Buser_id_eq%5D=&by_login=&by_name=&q%5Bprogram_id_eq%5D=&q%5Bcountry_id_in%5D%5B%5D=&q%5Bclick_type%5D=&q%5Bwith_leads%5D=0&q%5Bshow_with_negative_leads%5D=0&q%5Bonly_with_data%5D=0&q%5Bpreland_shown%5D=0&commit=Find&q%5Buniq_id_eq%5D=&q%5Bip_s%5D=&q%5Bcpa_id_eq%5D=&q%5Bhostname_cont%5D=&q%5Bpreland_template_id_eq%5D=&q%5Bpreland_id_eq%5D=&q%5Bsmart_template_id_eq%5D=&by_clicked=&by_webmaster_click_uid=&by_source=&by_sub1=&by_sub2=&by_sub3=&by_sub4=&by_sub5=&by_preland_locale_id%5B%5D=1&by_preland_locale_id%5B%5D=2&q%5Boperator_id_in%5D%5B%5D=&q%5Bnode_id_eq%5D="
# result = getQueryParamsAsObject(query)
# console.log(JSON.stringify(result, null, 2)
# {
#   "utf8": "✓",
#   "q[date_range]": "01.01.2022 - 10.07.2022",
#   "q[user_id_eq]": "",
#   "by_login": "",
#   "by_name": "",
#   "q[program_id_eq]": "",
#   "q[country_id_in]": [
#     ""
#   ],
#   "q[click_type]": "",
#   "q[with_leads]": "0",
#   "q[show_with_negative_leads]": "0",
#   "q[only_with_data]": "0",
#   "q[preland_shown]": "0",
#   "commit": "Find",
#   "q[uniq_id_eq]": "",
#   "q[ip_s]": "",
#   "q[cpa_id_eq]": "",
#   "q[hostname_cont]": "",
#   "q[preland_template_id_eq]": "",
#   "q[preland_id_eq]": "",
#   "q[smart_template_id_eq]": "",
#   "by_clicked": "",
#   "by_webmaster_click_uid": "",
#   "by_source": "",
#   "by_sub1": "",
#   "by_sub2": "",
#   "by_sub3": "",
#   "by_sub4": "",
#   "by_sub5": "",
#   "by_preland_locale_id": [
#     "1",
#     "2"
#   ],
#   "q[operator_id_in]": [
#     ""
#   ],
#   "q[node_id_eq]": ""
# }