Class: BreatheIn::Scraper

Inherits:
Object
  • Object
show all
Defined in:
lib/breathe_in/scraper.rb

Constant Summary collapse

@@air_quality_info = 
{}
@@scraped = 
nil

Class Method Summary collapse

Class Method Details

.air_quality ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 6

def self.air_quality
  @@air_quality_info
end

.AQI_range_information ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 98

def self.AQI_range_information
  information = <<-Ruby
    The Air Quality Index (AQI) translates air quality data into an easily understandable number to identify how clean or polluted the outdoor air is, along with possible health effects. 
    The U.S. Environmental Protection Agency, National Oceanic and Atmospheric Administration, National Park Service, tribal, state, and local agencies developed the AirNow system to provide the public with easy access to national air quality information. 

    "Good" AQI is 0 - 50. 
    Air quality is considered satisfactory, and air pollution poses little or no risk.
    ***************************
    "Moderate" AQI is 51 - 100. 
    Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people. For example, people who are unusually sensitive to ozone may experience respiratory symptoms.
    ***************************
    "Unhealthy for Sensitive Groups" AQI is 101 - 150. 
    Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air. 
    ***************************
    "Unhealthy" AQI is 151 - 200. 
    Everyone may begin to experience some adverse health effects, and members of the sensitive groups may experience more serious effects.
    ***************************
    "Very Unhealthy" AQI is 201 - 300. 
    This would trigger a health alert signifying that everyone may experience more serious health effects.
    ***************************
    "Hazardous" AQI greater than 300. 
    This would trigger a health warnings of emergency conditions. The entire population is more likely to be affected.
    ***************************
    All descriptions, information, and data are provided courtesy of AirNow.gov. Visit the website to learn more.
  Ruby
  puts information
end

.city_air_quality ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 26

def self.city_air_quality
  city_name
  today_high
  index_level
  current_conditions_time
  current_conditions_value
  current_conditions_index 
  air_quality
end

.city_name ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 36

def self.city_name
  city = scraped_pg.css("#pageContent .ActiveCity")
  #returns array of an object with attributes including city name
  city.empty? ? nil : air_quality[:city_name] = city.text.strip
end

.current_conditions_index ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 68

def self.current_conditions_index 
  current_index = scraped_pg.css(".AQDataSectionTitle .TblInvisible .AQDataLg")
  #returns array of an object with attributes including current condition index
  current_index.empty? ? nil : air_quality[:last_update_index] = current_index.text.strip
end

.current_conditions_time ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 54

def self.current_conditions_time
  unformatted_info = scraped_pg.css(".AQData .AQDataSectionTitle .AQDataSectionTitle")
  #returns array of objects with attributes of title and date information
  current_info = unformatted_info.text.strip.split("\r\n                                       \t")
  # => returns array ["Air Quality Index (AQI)", "observed at 19:00 PST"]
  unformatted_info.empty? ? nil : air_quality[:last_update_time] = current_info[1]
end

.current_conditions_value ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 62

def self.current_conditions_value 
  current_value = scraped_pg.css(".AQDataSectionTitle .TblInvisible .TblInvisible td")
  #returns array of an object with attributes including current condition value
  current_value.empty? ? nil : air_quality[:last_update_value] = current_value.text.strip.to_i
end

.index_good ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 74

def self.index_good
  print "Air quality is considered satisfactory, and air pollution poses little or no risk."
end

.index_hazardous ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 94

def self.index_hazardous
  print "Health alert: everyone may experience more serious health effects."
end

.index_level ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 48

def self.index_level 
  quality = scraped_pg.css(".AQDataContent .AQILegendText")
  #returns array of objects with attributes including quality
  quality.empty? ? nil : air_quality[:today_index] = quality.first.text
end

.index_moderate ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 78

def self.index_moderate
  print "Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution."
end

.index_sensitive ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 82

def self.index_sensitive
  print "Members of sensitive groups may experience health effects. The general public is not likely to be affected."
end

.index_unhealthy ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 86

def self.index_unhealthy
  print "Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects."
end

.index_very_unhealthy ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 90

def self.index_very_unhealthy
  print "Health warnings of emergency conditions. The entire population is more likely to be affected."
end

.scraped_page(zipcode) ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 14

def self.scraped_page(zipcode)
  begin
    @@scraped = Nokogiri::HTML(open("https://airnow.gov/?action=airnow.local_city&zipcode=#{zipcode}&submit=Go"))
  rescue OpenURI::HTTPError => e
      if e.message == '404 Not Found'
        puts "The website is currently down. Pleaes try again later."
      else
        raise e
      end
  end
end

.scraped_pg ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 10

def self.scraped_pg
  @@scraped
end

.today_high ⇒ Object 



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# File 'lib/breathe_in/scraper.rb', line 42

def self.today_high 
  data = scraped_pg.css(".AQDataContent tr td .TblInvisible tr td")
  #returns array of data numbers (today's high, tomorrow's high, particles, etc.)
  data.empty? ? nil : air_quality[:today_high] = data[0].text.strip.to_i
end

.under_maintenance ⇒ Object

returns true if under maintenance



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# File 'lib/breathe_in/scraper.rb', line 126

def self.under_maintenance #returns true if under maintenance 
  scraped_pg.css("#pageContent .TblInvisibleFixed tr p[style*='color:#F00;']").text.include?("maintenance")
end