Module: CS

Defined in:
lib/city-state.rb,
lib/city-state/version.rb

Constant Summary collapse

MAXMIND_ZIPPED_URL =

CS constants

"http://geolite.maxmind.com/download/geoip/database/GeoLite2-City-CSV.zip"
FILES_FOLDER = 
File.expand_path('../db', __FILE__)
MAXMIND_DB_FN = 
File.join(FILES_FOLDER, "GeoLite2-City-Locations-en.csv")
COUNTRIES_FN = 
File.join(FILES_FOLDER, "countries.yml")
ID =

constants: CVS position

0
COUNTRY = 
4
COUNTRY_LONG = 
5
STATE = 
6
STATE_LONG = 
7
CITY = 
10
VERSION = 
"0.0.11"

Class Method Summary collapse

Class Method Details

.cities(state, country = nil) ⇒ Object 



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# File 'lib/city-state.rb', line 133

def self.cities(state, country = nil)
  self.current_country = country if country.present? # set as current_country
  country = self.current_country

  # load the country file
  if @cities[country].blank?
    cities_fn = File.join(FILES_FOLDER, "cities.#{country.to_s.downcase}")
    self.install(country) if ! File.exists? cities_fn
    @cities[country] = YAML::load_file(cities_fn).symbolize_keys
  end

  @cities[country][state.to_s.upcase.to_sym] || []
end

.countries ⇒ Object

list of all countries of the world (countries.yml)



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# File 'lib/city-state.rb', line 162

def self.countries
  if ! File.exists? COUNTRIES_FN
    # countries.yml doesn't exists, extract from MAXMIND_DB
    update_maxmind unless File.exists? MAXMIND_DB_FN

    # reads CSV line by line
    File.foreach(MAXMIND_DB_FN) do |line|
      rec = line.split(",")
      next if rec[COUNTRY].blank? || rec[COUNTRY_LONG].blank? # jump empty records
      country = rec[COUNTRY].to_s.upcase.to_sym # normalize to something like :US, :BR
      if @countries[country].blank?
        long = rec[COUNTRY_LONG].gsub(/\"/, "") # sometimes names come with a "\" char
        @countries[country] = long
      end
    end

    # sort and save to "countries.yml"
    @countries = Hash[@countries.sort]
    File.open(COUNTRIES_FN, "w") { |f| f.write @countries.to_yaml }
  else
    # countries.yml exists, just read it
    @countries = YAML::load_file(COUNTRIES_FN).symbolize_keys
  end
  @countries
end

.current_country ⇒ Object 



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# File 'lib/city-state.rb', line 109

def self.current_country
  return @current_country if @current_country.present?

  # we don't have used this method yet: discover by the file extension
  fn = Dir[File.join(FILES_FOLDER, "cities.*")].last
  @current_country = fn.blank? ? nil : fn.split(".").last
  
  # there's no files: we'll install and use :US
  if @current_country.blank?
    @current_country = :US
    self.install(@current_country)

  # we find a file: normalize the extension to something like :US
  else
    @current_country = @current_country.to_s.upcase.to_sym    
  end

  @current_country
end

.current_country=(country) ⇒ Object 



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# File 'lib/city-state.rb', line 129

def self.current_country=(country)
  @current_country = country.to_s.upcase.to_sym
end

.get(country = nil, state = nil) ⇒ Object

get is a method to simplify the use of city-state get = countries, get(country) = states(country), get(country, state) = cities(state, country)



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# File 'lib/city-state.rb', line 190

def self.get(country = nil, state = nil)
  return self.countries if country.nil?
  return self.states(country) if state.nil?
  return self.cities(state, country)
end

.install(country) ⇒ Object 



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# File 'lib/city-state.rb', line 52

def self.install(country)
  # get CSV if doesn't exists
  update_maxmind unless File.exists? MAXMIND_DB_FN

  # normalize "country"
  country = country.to_s.upcase

  # some state codes are empty: we'll use "states-replace" in these cases
  states_replace_fn = File.join(FILES_FOLDER, "states-replace.yml")
  states_replace = YAML::load_file(states_replace_fn).symbolize_keys
  states_replace = states_replace[country.to_sym] || {} # we need just this country
  states_replace_inv = states_replace.invert # invert key with value, to ease the search

  # read CSV line by line
  cities = {}
  states = {}
  File.foreach(MAXMIND_DB_FN) do |line|
    rec = line.split(",")
    next if rec[COUNTRY] != country
    next if (rec[STATE].blank? && rec[STATE_LONG].blank?) || rec[CITY].blank?

    # some state codes are empty: we'll use "states-replace" in these cases
    rec[STATE] = states_replace_inv[rec[STATE_LONG]] if rec[STATE].blank?
    rec[STATE] = rec[STATE_LONG] if rec[STATE].blank? # there's no correspondent in states-replace: we'll use the long name as code

    # some long names are empty: we'll use "states-replace" to get the code
    rec[STATE_LONG] = states_replace[rec[STATE]] if rec[STATE_LONG].blank?

    # normalize
    rec[STATE] = rec[STATE].to_sym
    rec[CITY].gsub!(/\"/, "") # sometimes names come with a "\" char
    rec[STATE_LONG].gsub!(/\"/, "") # sometimes names come with a "\" char

    # cities list: {TX: ["Texas City", "Another", "Another 2"]}
    cities.merge!({rec[STATE] => []}) if ! states.has_key?(rec[STATE])
    cities[rec[STATE]] << rec[CITY]

    # states list: {TX: "Texas", CA: "California"}
    if ! states.has_key?(rec[STATE])
      state = {rec[STATE] => rec[STATE_LONG]}
      states.merge!(state)
    end
  end

  # sort
  cities = Hash[cities.sort]
  states = Hash[states.sort]
  cities.each { |k, v| cities[k].sort! }

  # save to states.us and cities.us
  states_fn = File.join(FILES_FOLDER, "states.#{country.downcase}")
  cities_fn = File.join(FILES_FOLDER, "cities.#{country.downcase}")
  File.open(states_fn, "w") { |f| f.write states.to_yaml }
  File.open(cities_fn, "w") { |f| f.write cities.to_yaml }
  true
end

.states(country) ⇒ Object 



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# File 'lib/city-state.rb', line 147

def self.states(country)
  self.current_country = country # set as current_country
  country = self.current_country # normalized

  # load the country file
  if @states[country].blank?
    states_fn = File.join(FILES_FOLDER, "states.#{country.to_s.downcase}")
    self.install(country) if ! File.exists? states_fn
    @states[country] = YAML::load_file(states_fn).symbolize_keys
  end

  @states[country] || {}
end

.update ⇒ Object 



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# File 'lib/city-state.rb', line 34

def self.update
  self.update_maxmind # update via internet
  Dir[File.join(FILES_FOLDER, "states.*")].each do |state_fn|
    self.install(state_fn.split(".").last.upcase.to_sym) # reinstall country
  end
  @countries = @cities = @states = {} # invalidades cache
  File.delete COUNTRIES_FN # force countries.yml to be generated at next call of CS.countries
  true
end

.update_maxmind ⇒ Object 



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# File 'lib/city-state.rb', line 13

def self.update_maxmind
  require "open-uri"
  require "zip"

  # get zipped file
  f_zipped = open(MAXMIND_ZIPPED_URL)

  # unzip file:
  # recursively searches for "GeoLite2-City-Locations-en"
  Zip::File.open(f_zipped) do |zip_file|
    zip_file.each do |entry|
      if entry.name["GeoLite2-City-Locations-en"].present?
        fn = entry.name.split("/").last
        entry.extract(File.join(FILES_FOLDER, fn)) { true } # { true } is to overwrite
        break
      end
    end
  end
  true
end