class Gherkin::Stream::ParserMessageStream

def build_gherkin_document(source)
  if @options[:default_dialect]
    token_matcher = TokenMatcher.new(@options[:default_dialect])
    gd = @parser.parse(source.data, token_matcher)
  else
    gd = @parser.parse(source.data)
  end
  gd[:uri] = source.uri
  Cucumber::Messages::GherkinDocument.new(gd)
end

def id_generator_class
  @options[:predictable_ids] ? Cucumber::Messages::IdGenerator::Incrementing : Cucumber::Messages::IdGenerator::UUID
end

def initialize(paths, sources, options)
  @paths = paths
  @sources = sources
  @options = options
  id_generator = id_generator_class.new
  @parser = Parser.new(AstBuilder.new(id_generator))
  @compiler = Pickles::Compiler.new(id_generator)
end

def messages
  Enumerator.new do |y|
    sources.each do |source|
      y.yield(Cucumber::Messages::Envelope.new(source: source)) if @options[:include_source]
      begin
        gherkin_document = nil
        if @options[:include_gherkin_document]
          gherkin_document = build_gherkin_document(source)
          y.yield(Cucumber::Messages::Envelope.new(gherkin_document: gherkin_document))
        end
        if @options[:include_pickles]
          gherkin_document ||= build_gherkin_document(source)
          pickles = @compiler.compile(gherkin_document, source)
          pickles.each do |pickle|
            y.yield(Cucumber::Messages::Envelope.new(pickle: pickle))
          end
        end
      rescue CompositeParserException => err
        yield_error_attachments(y, err.errors, source.uri)
      rescue ParserException => err
        yield_error_attachments(y, [err], source.uri)
      end
    end
  end
end

def sources
  Enumerator.new do |y|
    @paths.each do |path|
      source = Cucumber::Messages::Source.new(
        uri: path,
        data: File.open(path, 'r:UTF-8', &:read),
        media: Cucumber::Messages::Media.new(
          encoding: :UTF8,
          content_type: 'text/x.cucumber.gherkin+plain'
        )
      )
      y.yield(source)
    end
    @sources.each do |source|
      y.yield(source)
    end
  end
end

def yield_error_attachments(y, errors, uri)
  errors.each do |err|
    attachment = Cucumber::Messages::Attachment.new(
      source: Cucumber::Messages::SourceReference.new(
        uri: uri,
        location: Cucumber::Messages::Location.new(
          line: err.location[:line],
          column: err.location[:column]
        )
      ),
      data: err.message
    )
    y.yield(Cucumber::Messages::Envelope.new(attachment: attachment))
  end
end