class Cucumber::FeatureFile

def initialize(uri, source=nil)

or a path:line1:line2 etc. If +source+ is passed, +uri+ is ignored.
The +uri+ argument is the location of the source. It can ba a path 
def initialize(uri, source=nil)
  @source = source
  _, @path, @lines = *FILE_COLON_LINE_PATTERN.match(uri)
  if @path
    @lines = @lines.split(':').map { |line| line.to_i }
  else
    @path = uri
  end
end

def lang 

def lang
  line_one = source.split(/\n/)[0]
  if line_one =~ LANGUAGE_PATTERN
    $1.strip
  else
    nil
  end
end

def parse(step_mother, options)

be filtered.
If +options+ contains tags, the result will
Parses a file and returns a Cucumber::Ast 
def parse(step_mother, options)
  filter = Filter.new(@lines, options)
  language = Parser::NaturalLanguage.get(step_mother, (lang || 'en'))
  language.parse(source, @path, filter)
end

def source 

def source
  @source ||= if @path =~ /^http/
    require 'open-uri'
    open(@path).read
  else
    begin
      File.open(@path, Cucumber.file_mode('r')).read 
    rescue Errno::EACCES => e
      p = File.expand_path(@path)
      e.message << "\nCouldn't open #{p}"
      raise e
    end
  end
end