Class: RuboCop::Cop::Style::MultilineBlockChain

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/style/multiline_block_chain.rb

Overview

This cop checks for chaining of a block after another block that spans multiple lines.

Examples:


Thread.list.find_all do |t|
  t.alive?
end.map do |t|
  t.object_id
end

Constant Summary collapse

MSG = 
'Avoid multi-line chains of blocks.'

Constants included from Util

Util::ASGN_NODES, Util::EQUALS_ASGN_NODES, Util::OPERATOR_METHODS, Util::PROC_NEW_NODE, Util::SHORTHAND_ASGN_NODES

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods inherited from Cop

#add_offense, all, #autocorrect?, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, cop_type, #debug?, #display_cop_names?, #exclude_file?, #include_file?, inherited, #initialize, #join_force?, lint?, #message, non_rails, qualified_cop_name, rails?, #relevant_file?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

block_length, command?, comment_line?, const_name, first_part_of_call_chain, lambda?, lambda_or_proc?, line_range, numeric_range_size, on_node, operator?, parentheses?, proc?, range_with_surrounding_space, source_range, strip_quotes

Methods included from PathUtil

match_path?, relative_path

Constructor Details

This class inherits a constructor from RuboCop::Cop::Cop

Instance Method Details

#on_block(node) ⇒ Object 



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# File 'lib/rubocop/cop/style/multiline_block_chain.rb', line 19

def on_block(node)
  method, _args, _body = *node
  on_node(:send, method) do |send_node|
    receiver, _method_name, *_args = *send_node
    if receiver && receiver.type == :block
      # The begin and end could also be braces, but we call the
      # variables do... and end...
      do_kw_loc, end_kw_loc = receiver.loc.begin, receiver.loc.end

      if do_kw_loc.line != end_kw_loc.line
        range =
          Parser::Source::Range.new(end_kw_loc.source_buffer,
                                    end_kw_loc.begin_pos,
                                    method.loc.expression.end_pos)
        add_offense(nil, range)
        # Done. If there are more blocks in the chain, they will be
        # found by subsequent calls to on_block.
        break
      end
    end
  end
end