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Initial import of latest stable code from rubyforge.

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0 parents commit a341f2a9158bd4b1c4240b00e958b56ff061b4dd Walter Korman committed Oct 20, 2009
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  1. +1 −0 AUTHORS
  2. +3 −0 CHANGELOG
  3. +504 −0 LICENSE
  4. +81 −0 README
  5. +49 −0 Rakefile
  6. +5 −0 TODO
  7. +27 −0 examples/example.rb
  8. +21 −0 examples/get-weather.rb
  9. +301 −0 lib/yahoo-weather.rb
  10. +128 −0 test/test_api.rb
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+Walter Korman <>
@@ -0,0 +1,3 @@
+* 2006/11/05
+- [shaper] Initial version.
@@ -0,0 +1,504 @@
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+ library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+ <signature of Ty Coon>, 1 April 1990
+ Ty Coon, President of Vice
+That's all there is to it!
@@ -0,0 +1,81 @@
+= yahoo-weather
+== About
+yahoo-weather provides an object-oriented interface to the Yahoo! Weather XML
+RSS feed detailed at
+People care a lot about the weather, which sometimes seems ironic given that
+they can just glance out the window, but we can all understand the fascination
+with details and forecasting.
+Log the weather information to your database! Graph it to your heart's
+content! Write a widget that emails the weather to your cell phone every five
+minutes with a link to your friend's PayPal account to deposit money if the
+weather's sunny and you both bet that it would be rainy. And the fun doesn't
+have to stop there.
+The RubyForge project page is at
+== Installation
+Install the latest version via:
+ % gem install yahoo-weather
+== Usage
+A simple example program under <tt>examples/example.rb</tt> as:
+ require 'rubygems'
+ require 'yahoo-weather'
+ @client =
+ response = @client.lookup_location('98103')
+ # straight text output
+ print <<edoc
+ #{response.title}
+ #{response.condition.temp} degrees
+ #{response.condition.text}
+ edoc
+ # sample html output
+ print <<edoc
+ <div>
+ <img src="#{response.image_url}"><br/>
+ #{response.condition.temp} degrees #{response.units.temperature}<br/>
+ #{response.condition.text}<br>
+ Forecast:<br/>
+ #{response.forecasts[0].day} - #{response.forecasts[0].text}. High: #{response.forecasts[0].high} Low: #{response.forecasts[0].low}<br/>
+ #{response.forecasts[1].day} - #{response.forecasts[1].text}. High: #{response.forecasts[1].high} Low: #{response.forecasts[1].low}<br/>
+ More information <a href="#{response.page_url}">here</a>.
+ </div>
+ edoc
+Produces output as:
+ Conditions for Seattle, WA at 2:53 pm PST
+ 55 degrees F
+ Light Rain
+ <div>
+ <img src=""><br/>
+ 55 degrees F<br/>
+ Light Rain<br>
+ Forecast:<br/>
+ Sun - Rain/Wind. High: 56 Low: 54<br/>
+ Mon - Heavy Rain/Wind. High: 60 Low: 54<br/>
+ More information <a href="*">here</a>.
+ </div>
+There is a variety of detailed weather information in other attributes of the
+YahooWeather::Response object.
+== License
+This library is provided via the GNU LGPL license at
+== Author
+Copyright 2006, Walter Korman <>,
+Thanks to Matthew Berk for inspiration and initial hack.
49 Rakefile
@@ -0,0 +1,49 @@
+require 'rubygems'
+require 'rake'
+require 'rake/testtask'
+require 'rake/rdoctask'
+require 'rake/gempackagetask'
+spec = do |s|
+ = 'yahoo-weather'
+ s.version = '1.0.0'
+ s.summary = 'A Ruby object-oriented interface to the Yahoo! Weather service.'
+ = 'Walter Korman'
+ = ''
+ s.platform = Gem::Platform::RUBY
+ s.rubyforge_project = 'yahoo-weather'
+ s.has_rdoc = true
+ s.extra_rdoc_files = [ 'README' ]
+ s.rdoc_options << '--main' << 'README'
+ s.test_files = Dir.glob('test/test_*.rb')
+ s.files = Dir.glob("{examples,lib,test}/**/*") +
+ [ 'AUTHORS', 'CHANGELOG', 'LICENSE', 'README', 'Rakefile', 'TODO' ]
+ s.add_dependency("xml-simple", ">= 1.0.9")
+desc 'Run tests'
+task :default => [ :test ]
+'test') do |t|
+ t.libs << 'test'
+ t.pattern = 'test/test_*.rb'
+ t.verbose = true
+desc 'Generate RDoc' :rdoc do |rd|
+ rd.rdoc_dir = 'doc'
+ rd.rdoc_files.add 'lib', 'README'
+ rd.main = 'README'
+desc 'Build Gem' spec do |pkg|
+ pkg.need_tar = true
+desc 'Clean up'
+task :clean => [ :clobber_rdoc, :clobber_package ]
+desc 'Clean up'
+task :clobber => [ :clean ]
@@ -0,0 +1,5 @@
+- include the yahoo! weather logo image in the response
+- raise a module-specific exception on failure cases rather than just a string
+- add weather code image url accessor for forecasts
27 examples/example.rb
@@ -0,0 +1,27 @@
+#!/usr/bin/env ruby
+require 'rubygems'
+require 'yahoo-weather'
+@client =
+response = @client.lookup_location('98103')
+# straight text output
+print <<edoc
+#{response.condition.temp} degrees #{response.units.temperature}
+# html output
+print <<edoc
+ <img src="#{response.image_url}"><br/>
+ #{response.condition.temp} degrees #{response.units.temperature}<br/>
+ #{response.condition.text}<br>
+ Forecast:<br/>
+ #{response.forecasts[0].day} - #{response.forecasts[0].text}. High: #{response.forecasts[0].high} Low: #{response.forecasts[0].low}<br/>
+ #{response.forecasts[1].day} - #{response.forecasts[1].text}. High: #{response.forecasts[1].high} Low: #{response.forecasts[1].low}<br/>
+ More information <a href="#{response.page_url}">here</a>.
21 examples/get-weather.rb
@@ -0,0 +1,21 @@
+#!/usr/bin/env ruby
+# Simple example script demonstrating usage of the yahoo-weather library.
+# 2006/11/05 - Walter Korman (
+require 'rubygems'
+require 'pp'
+require 'yahoo-weather'
+location = ARGV[0]
+if !location
+ STDERR.print "Usage: get-weather.rb <zip code>\n"
+ exit
+print "Looking up weather for #{location}...\n"
+@client =
+response = @client.lookup_location(location)
301 lib/yahoo-weather.rb
@@ -0,0 +1,301 @@
+# yahoo-weather -- provides OO access to the Yahoo! Weather RSS XML feed
+# Copyright (C) 2006 Walter Korman <>
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# Lesser General Public License for more details.
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+require 'net/http'
+require 'pp'
+require 'time'
+require 'xmlsimple'
+module YahooWeather
+ # Describes astronomy information for a particular location.
+ class Astronomy
+ # a Time object detailing the sunrise time for a location.
+ attr_reader :sunrise
+ # a Time object detailing the sunset time for a location.
+ attr_reader :sunset
+ def initialize (payload)
+ @sunrise = YahooWeather._parse_time(payload['sunrise'])
+ @sunset = YahooWeather._parse_time(payload['sunset'])
+ end
+ end
+ # Describes a geographical location.
+ class Location
+ # the name of the city.
+ attr_reader :city
+ # the name of the country.
+ attr_reader :country
+ # the name of the region, such as a state.
+ attr_reader :region
+ def initialize (payload)
+ @city = payload['city']
+ @country = payload['country']
+ @region = payload['region']
+ end
+ end
+ # Describes the units of measure with which weather information is provided.
+ class Units
+ # the units in which temperature is measured, e.g. +F+ for +Fahrenheit+ or +C+ for +Celsius+.
+ attr_reader :temperature
+ # the units in which distance is measured, e.g. +mi+ for +miles+.
+ attr_reader :distance
+ # the units in which pressure is measured, e.g. +in+ for +inches+.
+ attr_reader :pressure
+ # the units in which speed is measured, e.g. +mph+ for <tt>miles per hour</tt>.
+ attr_reader :speed
+ def initialize (payload)
+ @temperature = payload['temperature']
+ @distance = payload['distance']
+ @pressure = payload['pressure']
+ @speed = payload['speed']
+ end
+ end
+ # Describes the specific wind conditions at a location.
+ class Wind
+ # the temperature factoring in wind chill.
+ attr_reader :chill
+ # the direction of the wind in degrees.
+ attr_reader :direction
+ # the speed of the wind.
+ attr_reader :speed
+ def initialize (payload)
+ @chill = payload['chill'].to_i
+ @direction = payload['direction'].to_i
+ @speed = payload['speed'].to_i
+ end
+ end
+ # Describes the specific atmospheric conditions at a location.
+ class Atmosphere
+ # the humidity of the surroundings.
+ attr_reader :humidity
+ # the visibility level of the surroundings
+ attr_reader :visibility
+ # the pressure level of the surroundings.
+ attr_reader :pressure
+ # whether the air currents are rising.
+ attr_reader :rising
+ def initialize (payload)
+ @humidity = payload['humidity'].to_i
+ @visibility = payload['visibility'].to_i
+ @pressure = payload['pressure'].to_f
+ @rising = (payload['rising'] == "1")
+ end
+ end
+ class Condition
+ # the Yahoo! Weather condition code, as detailed at
+ attr_reader :code
+ # the date and time associated with these conditions.
+ attr_reader :date
+ # the temperature of the location.
+ attr_reader :temp
+ # the brief prose text description of the weather conditions of the location.
+ attr_reader :text
+ def initialize (payload)
+ @code = payload['code'].to_i
+ @date = YahooWeather._parse_time(payload['date'])
+ @temp = payload['temp'].to_i
+ @text = payload['text']
+ end
+ end
+ # The forecasted weather conditions for a specific location.
+ class Forecast
+ # the brief name of the day associated with the forecast.
+ attr_reader :day
+ # the date associated with the forecast.
+ attr_reader :date
+ # the low temperature forecasted.
+ attr_reader :low
+ # the high temperature forecasted.
+ attr_reader :high
+ # the brief prose text description of the forecasted weather conditions.
+ attr_reader :text
+ # the Yahoo! Weather code associated with the forecast, per
+ attr_reader :code
+ def initialize (payload)
+ @day = payload['day']
+ @date = YahooWeather._parse_time(payload['date'])
+ @low = payload['low'].to_i
+ @high = payload['high'].to_i
+ @text = payload['text']
+ @code = payload['code'].to_i
+ end
+ end
+ # Describes the weather conditions for a particular requested location.
+ class Response
+ # a YahooWeather::Astronomy object detailing the sunrise and sunset
+ # information for the requested location.
+ attr_reader :astronomy
+ # a YahooWeather::Location object detailing the precise geographical names
+ # to which the requested location was mapped.
+ attr_reader :location
+ # a YahooWeather::Units object detailing the units corresponding to the
+ # information detailed in the response.
+ attr_reader :units
+ # a YahooWeather::Wind object detailing the wind information at the
+ # requested location.
+ attr_reader :wind
+ # a YahooWeather::Atmosphere object detailing the atmosphere information
+ # of the requested location.
+ attr_reader :atmosphere
+ # a YahooWeather::Condition object detailing the current conditions of the
+ # requested location.
+ attr_reader :condition
+ # a list of YahooWeather::Forecast objects detailing the high-level
+ # forecasted weather conditions for upcoming days.
+ attr_reader :forecasts
+ # the raw HTML generated by the Yahoo! Weather service summarizing current
+ # weather conditions for the requested location.
+ attr_reader :description
+ # a link to the Yahoo! Weather image icon representing the current weather
+ # conditions visually.
+ attr_reader :image_url
+ # the latitude of the location for which weather is detailed.
+ attr_reader :latitude
+ # the longitude of the location for which weather is detailed.
+ attr_reader :longitude
+ # a link to the Yahoo! Weather page with full detailed information on the
+ # requested location's current weather conditions.
+ attr_reader :page_url
+ # the location string initially requested of the service.
+ attr_reader :request_location
+ # the url with which the Yahoo! Weather service was accessed to build the response.
+ attr_reader :request_url
+ # the prose descriptive title of the weather information.
+ attr_reader :title
+ # regular expression used to pull the weather image icon from full
+ # description text.
+ @@REGEXP_IMAGE = src="([^"]+)"/)
+ def initialize (request_location, request_url, payload)
+ @request_location = request_location
+ @request_url = request_url
+ root = payload['channel'].first
+ @astronomy = root['astronomy'].first
+ @location = root['location'].first
+ @units = root['units'].first
+ @wind = root['wind'].first
+ @atmosphere = root['atmosphere'].first
+ item = root['item'].first
+ @condition = item['condition'].first
+ @forecasts = []
+ item['forecast'].each { |forecast| @forecasts << }
+ @latitude = item['lat'].first.to_f
+ @longitude = item['long'].first.to_f
+ @page_url = item['link'].first
+ @title = item['title'].first
+ @description = item['description'].first
+ match_data = @@REGEXP_IMAGE.match(description)
+ @image_url = (match_data) ? match_data[1] : nil
+ end
+ end
+ # The main client object through which the Yahoo! Weather service may be accessed.
+ class Client
+ # the url with which we obtain weather information from yahoo
+ @@API_URL = ""
+ def initialize (api_url = @@API_URL)
+ @api_url = api_url
+ end
+ # Returns a YahooWeather::Response object detailing the current weather
+ # information for the specified location.
+ #
+ # +location+ can be either a US zip code or a location code. Location
+ # codes can be looked up at, where it will appear
+ # in the URL that results from searching on the city or zip code. For
+ # instance, searching on 'Seattle, WA' results in a URL ending in
+ # 'USWA0395.html', so the location code for Seattle is 'USWA0395'.
+ #
+ # +units+ allows specifying whether to retrieve information in
+ # +Fahrenheit+ as +f+, or +Celsius+ as +c+, and defaults to +f+.
+ def lookup_location (location, units = 'f')
+ # query the service to grab the xml data
+ url = _request_url(location, units)
+ begin
+ response = Net::HTTP.get_response(URI.parse(url)).body.to_s
+ rescue
+ raise "failed to get weather via '#{url}': " + $!
+ end
+ # create the response object
+ response = XmlSimple.xml_in(response)
+, url, response)
+ end
+ private
+ def _request_url (location, units)
+ @api_url + '?p=' + URI.encode(location) + '&u=' + URI.encode(units)
+ end
+ end
+ private
+ def self._parse_time (text)
+ (text) ? Time.parse(text) : nil
+ end
128 test/test_api.rb
@@ -0,0 +1,128 @@
+require 'rubygems'
+require 'test/unit'
+require 'yahoo-weather'
+class TestAPI < Test::Unit::TestCase
+ def setup
+ @client =
+ end
+ def test_lookup_zip
+ # check a seattle, wa zipcode
+ request_location = '98103'
+ response = @client.lookup_location(request_location)
+ _assert_valid_response(response, request_location, 'f', 'Seattle', 'WA', 'US')
+ end
+ def test_lookup_location
+ # check france just for fun with the sample france location code from the
+ # yahoo weather developer page
+ request_location = 'FRXX0076'
+ response = @client.lookup_location(request_location)
+ _assert_valid_response(response, request_location, 'f', 'Paris', '', 'FR')
+ end
+ def test_units
+ request_location = '10001'
+ city = 'New York'
+ region = 'NY'
+ country = 'US'
+ # check explicitly specifying fahrenheit units
+ response = @client.lookup_location(request_location, 'f')
+ _assert_valid_response(response, request_location, 'f', city, region, country)
+ # check alternate units
+ response = @client.lookup_location(request_location, 'c')
+ _assert_valid_response(response, request_location, 'c', city, region, country)
+ end
+ private
+ def _assert_valid_response (response, request_location, units, city, region, country)
+ assert_not_nil response
+ # check the request location and url explicitly against what we know they should be
+ assert_equal response.request_location, request_location
+ assert_equal response.request_url, "{request_location}&u=#{units}"
+ # check the astronomy info
+ assert_instance_of YahooWeather::Astronomy, response.astronomy
+ assert_instance_of Time, response.astronomy.sunrise
+ assert_instance_of Time, response.astronomy.sunset
+ assert (response.astronomy.sunrise < response.astronomy.sunset)
+ # check the location
+ assert_instance_of YahooWeather::Location, response.location
+ assert_equal, city
+ assert_equal response.location.region, region
+ assert_equal, country
+ # check the default units
+ _assert_valid_units response.units, (units == 'f')
+ # check the wind info
+ assert_instance_of YahooWeather::Wind, response.wind
+ assert (response.wind.chill <= response.condition.temp)
+ assert_kind_of Numeric, response.wind.direction
+ assert_kind_of Numeric, response.wind.speed
+ # check the atmosphere info
+ assert_instance_of YahooWeather::Atmosphere, response.atmosphere
+ assert_kind_of Numeric, response.atmosphere.humidity
+ assert_kind_of Numeric, response.atmosphere.visibility
+ assert_kind_of Numeric, response.atmosphere.pressure
+ assert (response.atmosphere.rising.is_a?(TrueClass) || response.atmosphere.rising.is_a?(FalseClass))
+ # check the condition info
+ assert_instance_of YahooWeather::Condition, response.condition
+ _assert_valid_weather_code response.condition.code
+ assert_instance_of Time,
+ assert_kind_of Numeric, response.condition.temp
+ assert (response.condition.text && response.condition.text.length > 0)
+ # check the forecast info
+ assert_not_nil response.forecasts
+ assert_kind_of Array, response.forecasts
+ assert_equal response.forecasts.length, 2
+ response.forecasts.each do |forecast|
+ assert_instance_of YahooWeather::Forecast, forecast
+ assert ( && == 3)
+ assert_instance_of Time,
+ assert_kind_of Numeric, forecast.low
+ assert_kind_of Numeric, forecast.high
+ assert (forecast.low <= forecast.high)
+ assert (forecast.text && forecast.text.length > 0)
+ _assert_valid_weather_code forecast.code
+ end
+ # check the basic attributes
+ assert (response.description && response.description.length > 0)
+ assert (response.image_url =~ /yimg\.com/)
+ assert_kind_of Numeric, response.latitude
+ assert_kind_of Numeric, response.longitude
+ assert (response.page_url =~ /\.html$/)
+ assert (response.title && response.title.length > 0)
+ assert_not_nil (response.title.index("#{}, #{response.location.region}"))
+ end
+ def _assert_valid_weather_code (code)
+ (((code >= 0) && (code <= 47)) || (code == 3200))
+ end
+ def _assert_valid_units (units, fahrenheit_based)
+ assert_instance_of YahooWeather::Units, units
+ if fahrenheit_based
+ assert_equal units.temperature, 'F'
+ assert_equal units.distance, 'mi'
+ assert_equal units.pressure, 'in'
+ assert_equal units.speed, 'mph'
+ else
+ assert_equal units.temperature, 'C'
+ assert_equal units.distance, 'km'
+ assert_equal units.pressure, 'mb'
+ assert_equal units.speed, 'kph'
+ end
+ end

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