class Cucumber::Parser::GherkinBuilder

def ast
  @feature || @multiline_arg
end

def background(keyword, name, line)
  @background = Ast::Background.new(
    Ast::Comment.new(grab_comments!('')), 
    line, 
    keyword, 
    name, 
    steps=[]
  )
  @feature.background = @background
  @background.feature = @feature
  @step_container = @background
end

def comment(content, line)
  @comments ||= []
  @comments << content
end

def eof
  grab_table!
end

def examples(keyword, name, line)
  grab_table!
  @examples_fields = [Ast::Comment.new(grab_comments!('')), line, keyword, name]
end

def feature(keyword, name, line)
  @feature = Ast::Feature.new(
    nil, 
    Ast::Comment.new(grab_comments!('')), 
    Ast::Tags.new(nil, grab_tags!('')),
    keyword,
    name,
    []
  )
end

def grab_comments!(indent)
  comments = @comments ? indent + @comments.join("\n#{indent}") : ''
  @comments = nil
  comments
end

def grab_table!
  return if @rows.nil? 
  if @examples_fields
    @examples_fields << @rows
    @step_container.add_examples(@examples_fields)
    @examples_fields = nil
  else
    @multiline_arg = Ast::Table.new(@rows)
    @table_owner.multiline_arg = @multiline_arg if @table_owner
  end
  @rows = nil
end

def grab_tags!(indent)
  tags = @tags ? @tags : []
  @tags = nil
  tags
end

def py_string(string, line)
  @multiline_arg = Ast::PyString.new(string)
  @table_owner.multiline_arg = @multiline_arg if @table_owner
end

def row(row, line)
  @rows ||= []
  @rows << row
  class << row
    attr_accessor :line
  end
  row.line = line
end

def scenario(keyword, name, line)
  grab_table!
  scenario = Ast::Scenario.new(
    @background, 
    Ast::Comment.new(grab_comments!('')), 
    Ast::Tags.new(nil, grab_tags!('')), 
    line, 
    keyword, 
    name, 
    steps=[]
  )
  @feature.add_feature_element(scenario)
  @background.feature_elements << scenario if @background
  @step_container = scenario
end

def scenario_outline(keyword, name, line)
  grab_table!
  scenario_outline = Ast::ScenarioOutline.new(
    @background, 
    Ast::Comment.new(grab_comments!('')), 
    Ast::Tags.new(nil, grab_tags!('')), 
    line, 
    keyword, 
    name, 
    steps=[],
    example_sections=[]
  )
  @feature.add_feature_element(scenario_outline)
  if @background
    @background = @background.dup
    @background.feature_elements << scenario_outline
  end
  @step_container = scenario_outline
end

def step(keyword, name, line)
  grab_table!
  @table_owner = Ast::Step.new(line, keyword, name)
  @step_container.add_step(@table_owner)
end

def syntax_error(state, event, legal_events, line)
  # raise "SYNTAX ERROR"
end

def tag(name, line)
  @tags ||= []
  @tags << name
end