Class: RuboCop::Cop::Salsify::StyleDig

Inherits:
RuboCop::Cop show all
Extended by:
TargetRubyVersion
Defined in:
lib/rubocop/cop/salsify/style_dig.rb

Overview

Use `dig` for deeply nested access.

Examples:


# good
my_hash.dig('foo', 'bar')
my_array.dig(0, 1)

# bad
my_hash['foo']['bar']
my_hash['foo'] && my_hash['foo']['bar']
my_array[0][1]

Constant Summary collapse

MSG =
'Use `dig` for nested access.'

Instance Method Summary collapse

Instance Method Details

#autocorrect(node) ⇒ Object


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# File 'lib/rubocop/cop/salsify/style_dig.rb', line 41

def autocorrect(node)
  access_node = node
  source_args = [access_node.first_argument.source]
  while access_node?(access_node.children.first)
    access_node = access_node.children.first
    source_args << access_node.first_argument.source
  end
  root_node = access_node.children.first

  lambda do |corrector|
    range = Parser::Source::Range.new(node.source_range.source_buffer,
                                      root_node.source_range.end_pos,
                                      node.source_range.end_pos)
    corrector.replace(range, ".dig(#{source_args.reverse.join(', ')})")
  end
end

#on_send(node) ⇒ Object


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# File 'lib/rubocop/cop/salsify/style_dig.rb', line 32

def on_send(node)
  return unless nested_access_match(node) && !assignment?(node)

  match_node = node
  # walk to outermost access node
  match_node = match_node.parent while access_node?(match_node.parent)
  add_offense(match_node, location: :expression, message: MSG)
end