class RuboCop::Cop::Layout::EndOfLine


puts ‘Hello’ # Return character is CR+LF on all platforms.
# good
puts ‘Hello’ # Return character is LF on all platforms.
# bad
# enforced on all platforms.
# The ‘crlf` style means that CR+LF (Carriage Return + Line Feed) is
@example EnforcedStyle: crlf
puts ’Hello’ # Return character is LF on all platforms.
# good
puts ‘Hello’ # Return character is CR+LF on all platforms.
# bad
# all platforms.
# The ‘lf` style means that LF (Line Feed) is enforced on
@example EnforcedStyle: lf
puts ’Hello’ # Return character is LF on other than Windows.
puts ‘Hello’ # Return character is CR+LF on Windows.
# good
puts ‘Hello’ # Return character is CR+LF on other than Windows.
puts ‘Hello’ # Return character is LF on Windows.
# bad
# enforced on Windows, and LF is enforced on other platforms.
# The ‘native` style means that CR+LF (Carriage Return + Line Feed) is
@example EnforcedStyle: native (default)
Checks for Windows-style line endings in the source code.

def last_line(processed_source) 

def last_line(processed_source)
  last_token = processed_source.tokens.last
  last_token ? last_token.line : processed_source.lines.length
end

def offense_message(line) 

def offense_message(line)
  effective_style = if style == :native
                      Platform.windows? ? :crlf : :lf
                    else
                      style
                    end
  case effective_style
  when :lf then MSG_DETECTED if line.end_with?("\r", "\r\n")
  else MSG_MISSING unless line.end_with?("\r\n")
  end
end

def on_new_investigation 

def on_new_investigation
  last_line = last_line(processed_source)
  processed_source.raw_source.each_line.with_index do |line, index|
    break if index >= last_line
    msg = offense_message(line)
    next unless msg
    next if unimportant_missing_cr?(index, last_line, line)
    range = source_range(processed_source.buffer, index + 1, 0, line.length)
    add_offense(range, message: msg)
    # Usually there will be carriage return characters on all or none
    # of the lines in a file, so we report only one offense.
    break
  end
end

def unimportant_missing_cr?(index, last_line, line)

If there is no LF on the last line, we don't care if there's no CR. 
def unimportant_missing_cr?(index, last_line, line)
  style == :crlf && index == last_line - 1 && !line.end_with?("\n")
end