class RuboCop::Cop::Style::AsciiComments

# Translates from English to Japanese
# good
# Translates from English to 日本語。
# bad
@example
AllowedChars attribute (empty by default).
in comments. You could set an array of allowed non-ascii chars in
This cop checks for non-ascii (non-English) characters

def allowed_non_ascii_chars 

def allowed_non_ascii_chars
  cop_config['AllowedChars'] || []
end

def first_non_ascii_chars(string) 

def first_non_ascii_chars(string)
  string.match(/[^[:ascii:]]+/).to_s
end

def first_offense_range(comment) 

def first_offense_range(comment)
  expression    = comment.loc.expression
  first_offense = first_non_ascii_chars(comment.text)
  start_position = expression.begin_pos +
                   comment.text.index(first_offense)
  end_position   = start_position + first_offense.length
  range_between(start_position, end_position)
end

def investigate(processed_source) 

def investigate(processed_source)
  processed_source.each_comment do |comment|
    next if comment.text.ascii_only?
    next if only_allowed_non_ascii_chars?(comment.text)
    add_offense(comment, location: first_offense_range(comment))
  end
end

def only_allowed_non_ascii_chars?(string) 

def only_allowed_non_ascii_chars?(string)
  non_ascii = string.scan(/[^[:ascii:]]/)
  (non_ascii - allowed_non_ascii_chars).empty?
end