class RuboCop::Cop::Style::SpaceInsideStringInterpolation

var = “This is the #{ space } example”
# Good if EnforceStyle is space, bad if no_space.
var = “This is the #{no_space} example”
# Good if EnforcedStyle is no_space, bad if space.
@example
This cop checks for whitespace within string interpolations.

def autocorrect(node) 

def autocorrect(node)
  new_source = (style == :no_space) ? node.source : " #{node.source} "
  lambda do |corrector|
    corrector.replace(range_with_surrounding_space(node.source_range),
                      new_source)
  end
end

def on_dstr(node) 

def on_dstr(node)
  node.children.select { |n| n.type == :begin }.each do |begin_node|
    final_node = begin_node.children.last
    next unless final_node
    interp = final_node.source_range
    interp_with_surrounding_space = range_with_surrounding_space(interp)
    if style == :no_space
      if interp_with_surrounding_space != interp
        add_offense(final_node, :expression, NO_SPACE_MSG)
      end
    elsif style == :space
      if interp_with_surrounding_space.source != " #{interp.source} "
        add_offense(final_node, :expression, SPACE_MSG)
      end
    end
  end
end