Class: RuboCop::Cop::Metrics::Utils::CodeLengthCalculator

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 42

def build_foldable_checks(types) # rubocop:disable Metrics/MethodLength
  types.map do |type|
    case type
    when :array
      lambda(&:array_type?)
    when :hash
      lambda(&:hash_type?)
    when :heredoc
      ->(node) { heredoc_node?(node) }
    when :method_call
      lambda(&:call_type?)
    else
      raise Warning, "Unknown foldable type: #{type.inspect}. " \
                     "Valid foldable types are: #{FOLDABLE_TYPES.join(', ')}."
    end
  end
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 24

def calculate
  length = code_length(@node)
  return length if @foldable_types.empty?

  each_top_level_descendant(@node, @foldable_types) do |descendant|
    next unless foldable_node?(descendant)

    descendant_length = code_length(descendant)
    length = length - descendant_length + 1
    # Subtract length of opening and closing brace if method argument omits hash braces.
    length -= omit_length(descendant) if descendant.hash_type? && !descendant.braces?
  end

  length
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 90

def classlike_code_length(node)
  return 0 if namespace_module?(node)

  body_line_numbers = line_range(node).to_a[1...-1]

  target_line_numbers = body_line_numbers -
                        line_numbers_of_inner_nodes(node, :module, :class)

  target_line_numbers.reduce(0) do |length, line_number|
    source_line = @processed_source[line_number]
    next length if irrelevant_line?(source_line)

    length + 1
  end
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 138

def classlike_node?(node)
  CLASSLIKE_TYPES.include?(node&.type)
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 66

def code_length(node) # rubocop:disable Metrics/MethodLength
  if classlike_node?(node)
    classlike_code_length(node)
  elsif heredoc_node?(node)
    heredoc_length(node)
  else
    body = extract_body(node)
    return 0 unless body

    source =
      if node_with_heredoc?(body)
        source_from_node_with_heredoc(body)
      else
        body.source.lines
      end

    source.count { |line| !irrelevant_line?(line) }
  end
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 126

def each_top_level_descendant(node, types, &block)
  node.each_child_node do |child|
    next if classlike_node?(child)

    if types.include?(child.type)
      yield child
    else
      each_top_level_descendant(child, types, &block)
    end
  end
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 146

def extract_body(node)
  case node.type
  when :class, :module, :sclass, :block, :numblock, :def, :defs
    node.body
  when :casgn
    extract_body(node.expression)
  else
    node
  end
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 142

def foldable_node?(node)
  @foldable_checks.any? { |check| check.call(node) }
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 121

def heredoc_length(node)
  lines = node.loc.heredoc_body.source.lines
  lines.count { |line| !irrelevant_line?(line) } + 2
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 86

def heredoc_node?(node)
  node.respond_to?(:heredoc?) && node.heredoc?
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 158

def irrelevant_line?(source_line)
  source_line.blank? || (!count_comments? && comment_line?(source_line))
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 110

def line_numbers_of_inner_nodes(node, *types)
  line_numbers = Set.new

  node.each_descendant(*types) do |inner_node|
    line_range = line_range(inner_node)
    line_numbers.merge(line_range)
  end

  line_numbers.to_a
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 106

def namespace_module?(node)
  classlike_node?(node.body)
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 185

def node_with_heredoc?(node)
  node.each_descendant(:str, :dstr).any? { |descendant| heredoc_node?(descendant) }
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 60

def normalize_foldable_types(types)
  types.push(:str, :dstr) if types.delete(:heredoc)
  types.push(:send, :csend) if types.delete(:method_call)
  types
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 166

def omit_length(descendant)
  parent = descendant.parent
  return 0 if another_args?(parent)
  return 0 unless parenthesized?(parent)

  [
    parent.loc.begin.end_pos != descendant.source_range.begin_pos,
    parent.loc.end.begin_pos != descendant.source_range.end_pos
  ].count(true)
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 177

def parenthesized?(node)
  node.call_type? && node.parenthesized?
end

# File 'lib/rubocop/cop/metrics/utils/code_length_calculator.rb', line 189

def source_from_node_with_heredoc(node)
  last_line = -1
  node.each_descendant do |descendant|
    next unless descendant.source

    descendant_last_line =
      if heredoc_node?(descendant)
        descendant.loc.heredoc_end.line
      else
        descendant.last_line
      end

    last_line = [last_line, descendant_last_line].max
  end
  @processed_source[(node.first_line - 1)..(last_line - 1)]
end