Extract F and W ranges from EastAsianWidth.txt (http://www.unicode.org/Public/UNIDATA/EastAsianWidth.txt)

ranges.rb

is_continuous = false
start_code = nil
last_code = nil

File.open("EastAsianWidth.txt").each do |line|
  if !(/^\s*#/ =~ line) and !(/^\s*$/ =~ line)
    if /^([^;]+);(\S+)/ =~ line
      if $2.index 'W' or $2.index 'F'
        if not is_continuous
          start_code = $1
          is_continuous = true
        end
        last_code = $1
      elsif is_continuous
        puts "#{start_code} ~ #{last_code}"
        is_continuous = false
      end
    end
  end
end

if is_continuous
  puts "#{start_code} ~ #{last_code}"
end