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unicode_emoji_helper.rb
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unicode_emoji_helper.rb
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module Mattermost
class UnicodeEmojiHelper
GENDER_MALE = "\u{2642}"
GENDER_FEMALE = "\u{2640}"
ZERO_WIDTH_JOINER = "\u{200D}"
VARIATION_SELECTOR_16 = "\u{FE0F}"
SKIN_TONE_MAP = {
"\u{1F3FB}" => 'light skin tone',
"\u{1F3FC}" => 'medium-light skin tone',
"\u{1F3FD}" => 'medium skin tone',
"\u{1F3FE}" => 'medium-dark skin tone',
"\u{1F3FF}" => 'dark skin tone'
}.freeze
def initialize
path = File.join(File.dirname(__FILE__), './emoji-sequences.txt')
@emoji_sequences = File.readlines(path)
end
def all_emoji_modifier_bases
match_string = '; Emoji_Modifier_Sequence ;'
lines = @emoji_sequences.select { |l| l.include?(match_string) }
hex_strings = lines.map { |l| /^[0-9A-F]{4,5}/.match(l)[0] }
integers = hex_strings.map { |s| s.to_i(16) }
integers.map { |i| [i].pack('U') }
end
def emoji_modifier_base?(code_point)
all_emoji_modifier_bases.include?(code_point)
end
def emoji_modifier_sequences(emoji_modifier_chars)
return nil unless emoji_modifier_base?(emoji_modifier_chars[0])
if emoji_modifier_chars.include?(GENDER_MALE)
sequences = SKIN_TONE_MAP.each_key.map do |skin_tone_modifier|
[emoji_modifier_chars[0],
skin_tone_modifier,
ZERO_WIDTH_JOINER,
GENDER_MALE,
VARIATION_SELECTOR_16].join('')
end
else
sequences = SKIN_TONE_MAP.each_key.map do |skin_tone_modifier|
[emoji_modifier_chars[0], skin_tone_modifier].join('')
end
# Add female-specific sequences and see if they exist in the system font
# by returning nil from the AppleEmojiExtractor
sequences << SKIN_TONE_MAP.each_key.map do |skin_tone_modifier|
[emoji_modifier_chars[0],
skin_tone_modifier,
ZERO_WIDTH_JOINER,
GENDER_FEMALE,
VARIATION_SELECTOR_16].join('')
end
sequences.flatten!
end
sequences
end
end
end