Augmented BNF for Syntax Specifications example in ruby.

ABNF-syntax.rb

#!/usr/bin/env ruby
# -*- coding:utf-8 -*-


# some syntax define in RFC
# refer to http://tools.ietf.org/html/rfc5234

def loop_print(range)
  if range.is_a? Range
    range.each do |v|
      print v, ":", v.to_s.to_i.chr, "\n"
    end
  else
    v = range
    print v, ":", v.to_s.to_i.chr, "\n"
  end
end

# VSCHAR
puts "=========== VSCHAR =========="
loop_print((0x20..0x7E))

# NQCHAR
puts "=========== NQCHAR =========="
[(0x21), (0x23..0x5B), (0x5D..0x7E)].each do |range|
  loop_print(range)
end

# NQSCHAR
puts "=========== NQSCHAR =========="
[(0x20), (0x23..0x5B), (0x5D..0x7E)].each do |range|
  loop_print(range)
end