Class: TanukiEmoji::Db::UnicodeOrdering

Inherits:
Object
  • Object
show all
Defined in:
lib/tanuki_emoji/db/unicode_ordering.rb

Overview

Emoji Unicode Ordering database

Constant Summary collapse

DATA_FILE = 
"#{::TanukiEmoji::Db::UNICODE_DATA_DIR}/emoji-ordering.txt".freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(index:, data_file: nil) ⇒ UnicodeOrdering

Returns a new instance of UnicodeOrdering.



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# File 'lib/tanuki_emoji/db/unicode_ordering.rb', line 17

def initialize(index:, data_file: nil)
  @data_file = data_file || self.class.data_file
  @index = index
end

Instance Attribute Details

#data_file ⇒ Object (readonly)

Returns the value of attribute data_file.



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# File 'lib/tanuki_emoji/db/unicode_ordering.rb', line 15

def data_file
  @data_file
end

Class Method Details

.data_file ⇒ Object 



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# File 'lib/tanuki_emoji/db/unicode_ordering.rb', line 11

def self.data_file
  File.expand_path(File.join(__dir__, '../../../', DATA_FILE))
end

Instance Method Details

#load! ⇒ Object 



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# File 'lib/tanuki_emoji/db/unicode_ordering.rb', line 22

def load!
  db = {}
  File.readlines(data_file, mode: 'r:UTF-8').each_with_index do |line, line_number|
    next if line.start_with?('#')

    tokens = line.split
    semicolon_offset = tokens.index(';')
    next if semicolon_offset.nil?

    codepoints_array = tokens[0...semicolon_offset].map do |token|
      token[2...token.length].hex
    end
    codepoints = codepoints_array.pack('U*')

    db[codepoints] = line_number
  end

  db.each do |codepoints, sort_key|
    emoji = @index.find_by_codepoints(codepoints)

    next unless emoji

    emoji.sort_key = sort_key
  end
end