Class: GeoRuby::KmlParser

Inherits:
Object
  • Object
show all
Defined in:
lib/geo_ruby/kml.rb

Constant Summary collapse

ELEMENT_MAP = 
{
  # "Point" => SimpleFeatures::Point, # we don't need to map points.  they are done automatically by the coordinate parsing
  'LineString' => SimpleFeatures::LineString,
  'LinearRing' => SimpleFeatures::LinearRing,
  'Polygon' => SimpleFeatures::Polygon,
  'MultiGeometry' => SimpleFeatures::GeometryCollection
}

Instance Method Summary collapse

Constructor Details

#initialize(factory) ⇒ KmlParser

Returns a new instance of KmlParser.



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# File 'lib/geo_ruby/kml.rb', line 12

def initialize(factory)
  @factory = factory
  @buffer = ''
  @with_z = false
end

Instance Method Details

#parse(kml) ⇒ Object

argument should be a valid kml geometry fragment ie. <Point> .… </Point> returns the GeoRuby geometry object back



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# File 'lib/geo_ruby/kml.rb', line 20

def parse(kml)
  @factory.reset
  @with_z = false
  @parser = REXML::Parsers::PullParser.new(kml)
  while @parser.has_next?
    e = @parser.pull
    if e.start_element?
      if (type = ELEMENT_MAP[e[0]])
        @factory.begin_geometry(type)
      else
        @buffer = '' if (e[0] == 'coordinates') # clear the buffer
        accumulate_start(e)
      end
    elsif e.end_element?
      if ELEMENT_MAP[e[0]]
        @factory.end_geometry(@with_z)
        @buffer = '' # clear the buffer
      else
        accumulate_end(e)
        if (e[0] == 'coordinates')
          parse_coordinates(@buffer)
          @buffer = '' # clear the buffer
        end
      end
    elsif e.text?
      accumulate_text(e)
    elsif e.cdata?
      accumulate_cdata(e)
    end
  end
  @factory.geometry.dup
end