class Spec::Runner::SpecParser

def consider_example_for_best_match(example, example_group, file, line_number)
  parsed_backtrace = parse_backtrace(example.implementation_backtrace)
  parsed_backtrace.each do |example_file, example_line|
    if is_best_match?(file, line_number, example_file, example_line)
      best_match.clear
      best_match[:example_group] = example_group
      best_match[:example] = example
      best_match[:line] = example_line
    end
  end
end

def consider_example_groups_for_best_match(example_group, file, line_number)
  parsed_backtrace = parse_backtrace(example_group.registration_backtrace)
  parsed_backtrace.each do |example_file, example_line|
    if is_best_match?(file, line_number, example_file, example_line)
      best_match.clear
      best_match[:example_group] = example_group
      best_match[:line] = example_line
    end
  end
end

def initialize
  @best_match = {}
end

def is_best_match?(file, line_number, example_file, example_line)
  file == File.expand_path(example_file) &&
  example_line <= line_number &&
  example_line > best_match[:line].to_i
end

def parse_backtrace(backtrace)
  backtrace.collect do |trace_line|
    split_line = trace_line.split(':')
    [split_line[0], Integer(split_line[1])]
  end
end

def spec_name_for(file, line_number)
  best_match.clear
  file = File.expand_path(file)
  Spec::Runner.options.example_groups.each do |example_group|
    consider_example_groups_for_best_match example_group, file, line_number
    example_group.examples.each do |example|
      consider_example_for_best_match example, example_group, file, line_number
    end
  end
  if best_match[:example_group]
    if best_match[:example]
      "#{best_match[:example_group].description} #{best_match[:example].description}"
    else
      best_match[:example_group].description
    end
  else
    nil
  end
end