Class: CartoJson::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/carto_json/parser.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/carto_json/parser.rb', line 8

def initialize(input)
  @input = input
  @parsed = nil
end

Class Method Details

.parse(input) ⇒ Object 



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# File 'lib/carto_json/parser.rb', line 3

def self.parse(input)
  p = new input
  p.parse
end

Instance Method Details

#parse(input = @input) ⇒ Object 



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# File 'lib/carto_json/parser.rb', line 13

def parse(input=@input)
  return nil if input.nil?

  case input
  when Array
    @parsed = []
    input.each {|element| @parsed << parse_element(element) }

  when Hash
    input = Utils.symbolize_keys(input)
    @parsed = parse_element input

  when String
    begin
      decoded = MultiJson.decode(input, :symbolize_keys => true)
    rescue MultiJson::DecodeError => e
      raise InputError, "unable to decode JSON: \"#{e.message}\""
    end
    @parsed = parse decoded
  else
    raise InputError, "expected Array, Hash or String, you provided #{input.class}"
  end

  @parsed
end

#parse_element(element) ⇒ Object 



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# File 'lib/carto_json/parser.rb', line 39

def parse_element(element)
  if element[:type].nil?
    if element[LAT] && element[LNG]
      element[:type] = 'point'
    else
      raise InputError, "cannot determine type for the provided element (type is missing or #{LAT}/#{LNG} are not present)"
    end
  end

  unless TYPES.include? element[:type].to_sym
    raise InvalidTypeError.new(element[:type].to_sym,
                               "unsupported type: \"#{element[:type]}\", supported types: #{TYPES.join(', ')}")
  end
  
  class_name = element[:type] == 'linestring' ? 'LineString' : element[:type].capitalize

  CartoJson.const_get(class_name).parse element
end