class Haml::Compiler::ChildrenCompiler

def rstrip_whitespace!(temple)
  return if temple.size == 1
  case temple[0]
  when :multi
    case temple[-1][0]
    when :whitespace
      temple.delete_at(-1)
    when :multi, :block
      rstrip_whitespace!(temple[-1])
    end
  when :block
    _block, code, exp = temple
    if code.start_with?(/\s*if\s/)
      # Remove [:whitespace] before `end`
      exp.replace(@multi_flattener.call(exp))
      rstrip_whitespace!(exp)
      # Remove [:whitespace] before `else` if exists
      else_index = find_else_index(exp)
      if else_index
        whitespace_index = else_index - 1
        while exp[whitespace_index] == [:newline]
          whitespace_index -= 1
        end
        if exp[whitespace_index] == [:whitespace]
          exp.delete_at(whitespace_index)
        end
      end
    end
  end
end