Class: RuboCop::Cop::Style::SingleLineDoEndBlock

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Includes:
CheckSingleLineSuitability
Defined in:
lib/rubocop/cop/style/single_line_do_end_block.rb

Overview

Checks for single-line ‘do`…`end` block.

In practice a single line ‘do`…`end` is autocorrected when `EnforcedStyle: semantic` is configured for `Style/BlockDelimiters`. The autocorrection maintains the `do` … `end` syntax to preserve semantics and does not change it to ``…`` block.

NOTE: If ‘InspectBlocks` is set to `true` for `Layout/RedundantLineBreak`, blocks will be autocorrected to be on a single line if possible. This cop respects that configuration by not registering an offense if it would subsequently cause a `Layout/RedundantLineBreak` offense.

Examples:


# bad
foo do |arg| bar(arg) end

# good
foo do |arg|
  bar(arg)
end

# bad
->(arg) do bar(arg) end

# good
->(arg) { bar(arg) }

Constant Summary collapse

MSG = 
'Prefer multiline `do`...`end` block.'

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Methods included from CheckSingleLineSuitability

#suitable_as_single_line?

Instance Method Details

#on_block(node) ⇒ Object Also known as: on_numblock

rubocop:disable Metrics/AbcSize



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# File 'lib/rubocop/cop/style/single_line_do_end_block.rb', line 40

def on_block(node)
  return if !node.single_line? || node.braces?
  return if single_line_blocks_preferred? && suitable_as_single_line?(node)

  add_offense(node) do |corrector|
    corrector.insert_after(do_line(node), "\n")

    node_body = node.body

    if node_body.respond_to?(:heredoc?) && node_body.heredoc?
      corrector.remove(node.loc.end)
      corrector.insert_after(node_body.loc.heredoc_end, "\nend")
    else
      corrector.insert_before(node.loc.end, "\n")
    end
  end
end