class RSpec::Core::World

def announce_exclusion_filter(announcements)
  unless exclusion_filter.empty_without_conditional_filters?
    announcements << "excluding #{exclusion_filter.description}"
  end
end

def announce_filters
  filter_announcements = []
  if @configuration.run_all_when_everything_filtered? && example_count.zero?
    reporter.message( "No examples matched #{inclusion_filter.description}. Running all.")
    filtered_examples.clear
    @configuration.clear_inclusion_filter
  end
  announce_inclusion_filter filter_announcements
  announce_exclusion_filter filter_announcements
  if example_count.zero?
    example_groups.clear
    if filter_announcements.empty?
      reporter.message("No examples found.")
    elsif !inclusion_filter.empty?
      message = "No examples matched #{inclusion_filter.description}."
      if @configuration.run_all_when_everything_filtered?
        message << " Running all."
      end
      reporter.message(message)
    elsif !exclusion_filter.empty?
      reporter.message(
        "No examples were matched. Perhaps #{exclusion_filter.description} is excluding everything?")
    end
  elsif !filter_announcements.empty?
    reporter.message("Run filtered #{filter_announcements.join(', ')}")
  end
end

def announce_inclusion_filter(announcements)
  unless inclusion_filter.empty?
    announcements << "including #{inclusion_filter.description}"
  end
end

def apply_exclusion_filters(examples, filters)
  filters.empty? ? examples : examples.reject {|e| e.metadata.any_apply?(filters)}
end

def apply_inclusion_filters(examples, filters)
  filters.empty? ? examples : examples.select {|e| e.metadata.any_apply?(filters)}
end

def configure_group(group)
  @configuration.configure_group(group)
end

def declaration_line_numbers
  @line_numbers ||= example_groups.inject([]) do |lines, g|
    lines + g.declaration_line_numbers
  end
end

def example_count
  example_groups.collect {|g| g.descendants}.flatten.inject(0) { |sum, g| sum += g.filtered_examples.size }
end

def exclusion_filter
  @configuration.exclusion_filter.extend(Describable)
end

def find_hook(hook, scope, group, example = nil)
  @configuration.find_hook(hook, scope, group, example)
end

def inclusion_filter
  @configuration.inclusion_filter.extend(Describable)
end

def initialize(configuration=RSpec.configuration)
  @configuration = configuration
  @example_groups = []
  @filtered_examples = Hash.new { |hash,group|
    hash[group] = begin
      examples = group.examples.dup
      examples = apply_exclusion_filters(examples, exclusion_filter)
      examples = apply_inclusion_filters(examples, inclusion_filter)
      examples.uniq
    end
  }
end

def preceding_declaration_line(filter_line)
  declaration_line_numbers.sort.inject(nil) do |highest_prior_declaration_line, line|
    line <= filter_line ? line : highest_prior_declaration_line
  end
end

def register(example_group)
  example_groups << example_group
  example_group
end

def reporter
  @configuration.reporter
end

def reset
  example_groups.clear
end

def shared_example_groups
  @shared_example_groups ||= {}
end