Class: Location

Inherits:
Object
  • Object
show all
Defined in:
lib/flickru/location.rb

Constant Summary collapse

DEFAULT_ACCURACY = 
"street"
COORD_PATTERN = 
"-?[0-9]+\.?[0-9]*"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(photo) ⇒ Location

Returns a new instance of Location.

Raises:

  • (RuntimeError) 


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# File 'lib/flickru/location.rb', line 19

def initialize photo
  dir   = File.basename File.dirname(photo)
  name, place, accuracy = Location.parse dir
  raise RuntimeError, "#{dir}, name not provided" if name.nil?
  @name = name
  begin
    @place     = place.nil? ? name : place
    @latitude, @longitude = Location.locate @place
    @accuracy  = Location.s_to_accuracy(accuracy ? accuracy : DEFAULT_ACCURACY)
  rescue RuntimeError
    raise if place
    raise RuntimeError, "location #{name} not found" if accuracy
    @place, @latitude, @longitude, @accuracy = nil # no location
  end
end

Instance Attribute Details

#accuracy ⇒ Object

Returns the value of attribute accuracy.



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# File 'lib/flickru/location.rb', line 17

def accuracy
  @accuracy
end

#latitude ⇒ Object

Returns the value of attribute latitude.



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# File 'lib/flickru/location.rb', line 17

def latitude
  @latitude
end

#longitude ⇒ Object

Returns the value of attribute longitude.



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# File 'lib/flickru/location.rb', line 17

def longitude
  @longitude
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/flickru/location.rb', line 17

def name
  @name
end

#place ⇒ Object

Returns the value of attribute place.



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# File 'lib/flickru/location.rb', line 17

def place
  @place
end

Class Method Details

.geowiki(place) ⇒ Object 



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# File 'lib/flickru/location.rb', line 101

def Location.geowiki place
  wiki = open("http://en.wikipedia.org/wiki/#{URI::encode(place)}").read
  tool = open(wiki.tr("\"", "\n").split("\n").grep(/geohack/) \
                  .first.sub(/^\/\//,'http://').sub('&','&')).read
  geo  = tool.split("\n").grep(/<span class="geo"/).first
  latitude  = geo.sub(/^.*"Latitude">/, '').sub(/<\/span>, .*/, '')
  longitude = geo.sub(/.*"Longitude">/, '').sub(/<\/span>.*$/, '')
  latitude + ", " + longitude
end

.locate(place) ⇒ Object 



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# File 'lib/flickru/location.rb', line 63

def Location.locate place
  the_place = place # needed for RuntimeError reporting
  begin
    place = Location.geowiki place \
      if place !~ /^#{COORD_PATTERN}, *#{COORD_PATTERN}$/
    if place =~ /^#{COORD_PATTERN}, *#{COORD_PATTERN}$/
      # latitude, longitude
      [place.sub(/, *#{COORD_PATTERN}$/, ''), place.sub(/^#{COORD_PATTERN}, */, '')]
    else
      raise RuntimeError
    end
  rescue
    raise RuntimeError, "location #{the_place} not found"
  end
end

.parse(location) ⇒ Object 



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# File 'lib/flickru/location.rb', line 51

def Location.parse location
# TODO special characters MAY be escaped
  idx_accuracy = location.index('#') ? location.index('#') : location.length
  idx_place    = location.index('@') ? location.index('@') : idx_accuracy

  name     = location.sub(/[@#].*$/, '').strip | nil
  place    = location.index('@') ? location.sub(/^.*@/, '').sub(/\#.*$/, '').strip : nil
  accuracy = location.index('#') ? location.sub(/^.*#/, '').strip : nil

  [name, place, accuracy]
end

.s_to_accuracy(str) ⇒ Object 



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# File 'lib/flickru/location.rb', line 79

def Location.s_to_accuracy str
  case str.downcase
  when "world"   then 1
  when "country" then 3
  when "region"  then 6
  when "city"    then 11
  when "street"  then 16
  else raise ArgumentError, "unknown accuracy label '#{str}'"
  end
end

Instance Method Details

#nil? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/flickru/location.rb', line 35

def nil?
  Ruby.assert("@accuracy.nil? implies @latitude.nil? and @longitude.nil?") {
    @accuracy.nil? or not (@latitude.nil? and @longitude.nil?)
  }

  @accuracy.nil?
end

#to_s ⇒ Object 



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# File 'lib/flickru/location.rb', line 43

def to_s
  place = @place.nil? ? "an undefined place" : @place
  "#{@name.black} at #{place.black} (~#{accuracy_to_s.black}) " +
  "on lat: #{@latitude.black}, lon: #{@longitude.black}"
end