class EmojiRegex::Maker

Public Class Methods

new() click to toggle source
# File lib/emoji-regex/maker.rb, line 3
def initialize
  @input_file_path = File.join(__dir__, '../../data', 'sorted_emoji.txt')
end

Public Instance Methods

ranges() click to toggle source
# File lib/emoji-regex/maker.rb, line 24
def ranges
  prev = -1
  prev_hex = ''
  left = ''

  ranges = File.open(@input_file_path).map do |line|
    hex = line.to_i(16)
    if hex == prev || hex == prev + 1
      prev = hex
      prev_hex = line.chomp
      next
    end
    range = [left, prev_hex]
    left = line.chomp
    prev = hex
    prev_hex = left
    range
  end

  ranges
    .compact
    .reject { |a, b| a.empty? || b.empty? }
end
regex() click to toggle source
# File lib/emoji-regex/maker.rb, line 7
def regex
  regex = ranges.map do |e|
    l = e[0]
    r = e[1]
    next if l == '' || r == '' || !l[/\s/].nil? || !r[/\s/].nil?
    if l == r
      "\\u{#{l}}"
    else
      "\\u{#{l}}-\\u{#{r}}"
    end
  end
  regex.unshift '['
  regex.push ']'

  Regexp.new(regex.join)
end