class RuboCop::Cop::RSpec::LetBeforeExamples

end
expect(some).to be
it ‘checks what some does’ do
end
expect(foo).to be
it ‘checks what foo does’ do
let(:some) { other }
let(:foo) { bar }
# Good
end
expect(some).to be
it ‘checks what some does’ do
let(:some) { other }
end
expect(foo).to be
it ‘checks what foo does’ do
let(:foo) { bar }
# Bad
@example
Checks for ‘let` definitions that come after an example.

def autocorrect(node) 

def autocorrect(node)
  lambda do |corrector|
    first_example = find_first_example(node.parent)
    first_example_pos = first_example.loc.expression
    indent = "\n" + ' ' * first_example.loc.column
    corrector.insert_before(first_example_pos, source(node) + indent)
    corrector.remove(node_range_with_surrounding_space(node))
  end
end

def check_let_declarations(node) 

def check_let_declarations(node)
  first_example = find_first_example(node)
  return unless first_example
  node.each_child_node do |child|
    next if child.sibling_index < first_example.sibling_index
    add_offense(child, location: :expression) if let?(child)
  end
end

def find_first_example(node) 

def find_first_example(node)
  node.children.find { |sibling| example_or_group?(sibling) }
end

def multiline_block?(block) 

def multiline_block?(block)
  block.begin_type?
end

def node_range(node) 

def node_range(node)
  range_between(
    node.loc.expression.begin_pos,
    final_end_location(node).end_pos
  )
end

def node_range_with_surrounding_space(node) 

def node_range_with_surrounding_space(node)
  range = node_range(node)
  range_by_whole_lines(range, include_final_newline: true)
end

def on_block(node) 

def on_block(node)
  return unless example_group_with_body?(node)
  check_let_declarations(node.body) if multiline_block?(node.body)
end

def source(node) 

def source(node)
  node_range(node).source
end