class RuboCop::Cop::Layout::FirstArrayElementIndentation

Checks the indentation of the first element in an array literal where the opening bracket and the first element are on separate lines. The other elements' indentations are handled by the ArrayAlignment cop.

By default, array literals that are arguments in a method call with parentheses, and where the opening square bracket of the array is on the same line as the opening parenthesis of the method call, shall have their first element indented one step (two spaces) more than the position inside the opening parenthesis.

Other array literals shall have their first element indented one step more than the start of the line where the opening square bracket is.

This default style is called 'special_inside_parentheses'. Alternative styles are 'consistent' and 'align_brackets'. Here are examples:

@example EnforcedStyle: special_inside_parentheses (default)

# The `special_inside_parentheses` style enforces that the first
# element in an array literal where the opening bracket and first
# element are on separate lines is indented one step (two spaces) more
# than the position inside the opening parenthesis.

#bad
array = [
  :value
]
and_in_a_method_call([
  :no_difference
                     ])

#good
array = [
  :value
]
but_in_a_method_call([
                       :its_like_this
                     ])

@example EnforcedStyle: consistent

# The `consistent` style enforces that the first element in an array
# literal where the opening bracket and the first element are on
# separate lines is indented the same as an array literal which is not
# defined inside a method call.

#bad
# consistent
array = [
  :value
]
but_in_a_method_call([
                       :its_like_this
])

#good
array = [
  :value
]
and_in_a_method_call([
  :no_difference
])

@example EnforcedStyle: align_brackets

# The `align_brackets` style enforces that the opening and closing
# brackets are indented to the same position.

#bad
# align_brackets
and_now_for_something = [
                          :completely_different
]

#good
# align_brackets
and_now_for_something = [
                          :completely_different
                        ]

Constants

MSG

Public Instance Methods

on_array(node) click to toggle source
# File lib/rubocop/cop/layout/first_array_element_indentation.rb, line 91
def on_array(node)
  check(node, nil) if node.loc.begin
end
on_csend(node)
Alias for: on_send
on_send(node) click to toggle source
# File lib/rubocop/cop/layout/first_array_element_indentation.rb, line 95
def on_send(node)
  each_argument_node(node, :array) do |array_node, left_parenthesis|
    check(array_node, left_parenthesis)
  end
end
Also aliased as: on_csend

Private Instance Methods

autocorrect(corrector, node) click to toggle source
# File lib/rubocop/cop/layout/first_array_element_indentation.rb, line 104
def autocorrect(corrector, node)
  AlignmentCorrector.correct(corrector, processed_source, node, @column_delta)
end
base_description(indent_base_type) click to toggle source

Returns the description of what the correct indentation is based on.

# File lib/rubocop/cop/layout/first_array_element_indentation.rb, line 142
def base_description(indent_base_type)
  case indent_base_type
  when :left_brace_or_bracket
    'the position of the opening bracket'
  when :first_column_after_left_parenthesis
    'the first position after the preceding left parenthesis'
  when :parent_hash_key
    'the parent hash key'
  else
    'the start of the line where the left square bracket is'
  end
end
brace_alignment_style() click to toggle source
# File lib/rubocop/cop/layout/first_array_element_indentation.rb, line 108
def brace_alignment_style
  :align_brackets
end
check(array_node, left_parenthesis) click to toggle source
# File lib/rubocop/cop/layout/first_array_element_indentation.rb, line 112
def check(array_node, left_parenthesis)
  return if ignored_node?(array_node)

  left_bracket = array_node.loc.begin
  first_elem = array_node.values.first
  if first_elem
    return if same_line?(first_elem, left_bracket)

    check_first(first_elem, left_bracket, left_parenthesis, 0)
  end

  check_right_bracket(array_node.loc.end, first_elem, left_bracket, left_parenthesis)
end
check_right_bracket(right_bracket, first_elem, left_bracket, left_parenthesis) click to toggle source
# File lib/rubocop/cop/layout/first_array_element_indentation.rb, line 126
def check_right_bracket(right_bracket, first_elem, left_bracket, left_parenthesis)
  # if the right bracket is on the same line as the last value, accept
  return if /\S/.match?(right_bracket.source_line[0...right_bracket.column])

  expected_column, indent_base_type = indent_base(left_bracket, first_elem,
                                                  left_parenthesis)
  @column_delta = expected_column - right_bracket.column
  return if @column_delta.zero?

  msg = message_for_right_bracket(indent_base_type)
  add_offense(right_bracket, message: msg) do |corrector|
    autocorrect(corrector, right_bracket)
  end
end
message(base_description) click to toggle source
# File lib/rubocop/cop/layout/first_array_element_indentation.rb, line 155
def message(base_description)
  format(
    MSG,
    configured_indentation_width: configured_indentation_width,
    base_description: base_description
  )
end
message_for_right_bracket(indent_base_type) click to toggle source
# File lib/rubocop/cop/layout/first_array_element_indentation.rb, line 163
def message_for_right_bracket(indent_base_type)
  case indent_base_type
  when :left_brace_or_bracket
    'Indent the right bracket the same as the left bracket.'
  when :first_column_after_left_parenthesis
    'Indent the right bracket the same as the first position ' \
    'after the preceding left parenthesis.'
  when :parent_hash_key
    'Indent the right bracket the same as the parent hash key.' \
  else
    'Indent the right bracket the same as the start of the line ' \
    'where the left bracket is.'
  end
end