Module: Ecoji

Defined in:
lib/ecoji.rb,
lib/ecoji.rb,
lib/ecoji/version.rb

Defined Under Namespace

Modules: Emojis Classes: Error

Constant Summary collapse

PADDING = 
0x2615
PADDING_LAST_V1 = 
[0x269C, 0x1F3CD, 0x1F4D1, 0x1F64B].freeze
PADDING_LAST_V2 = 
[0x1F977, 0x1F6FC, 0x1F4D1, 0x1F64B].freeze
REV_EMOJIS = 
begin
  map = {}

  Emojis::V1.each_with_index do |n, ordinal|
    map[n] = { ordinal:, version: 1, padding: :none }
  end

  Emojis::V2.each_with_index do |n, ordinal|
    if map[n]
      map[n][:version] = 3
    else
      map[n] = { ordinal:, version: 2, padding: :none }
    end
  end

  map[PADDING] = { ordinal: 0, version: 3, padding: :fill }
  map[PADDING_LAST_V1[0]] = { ordinal: 0, version: 1, padding: :last }
  map[PADDING_LAST_V1[1]] = { ordinal: 1 << 8, version: 1, padding: :last }
  map[PADDING_LAST_V1[2]] = { ordinal: 2 << 8, version: 3, padding: :last }
  map[PADDING_LAST_V1[3]] = { ordinal: 3 << 8, version: 3, padding: :last }
  map[PADDING_LAST_V2[0]] = { ordinal: 0, version: 2, padding: :last }
  map[PADDING_LAST_V2[1]] = { ordinal: 1 << 8, version: 2, padding: :last }

  map
end
VERSION = 
'0.1.0'

Class Method Summary collapse

Class Method Details

.decode(data, encoding: Encoding::UTF_8) ⇒ Object 



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# File 'lib/ecoji.rb', line 63

def self.decode(data, encoding: Encoding::UTF_8)
  expected_version = 3
  chars = data.chars
  result = []

  loop do
    emojis, expected_version = read_four(chars, expected_version)
    break if emojis.empty?

    bits = (emojis[0][:ordinal] << 30) |
           (emojis[1][:ordinal] << 20) |
           (emojis[2][:ordinal] << 10) |
           emojis[3][:ordinal]
    out = [
      bits >> 32,
      0xff & (bits >> 24),
      0xff & (bits >> 16),
      0xff & (bits >> 8),
      0xff & bits
    ]

    if emojis[1][:padding] == :fill
      out = out[0...1]
    elsif emojis[2][:padding] == :fill
      out = out[0...2]
    elsif emojis[3][:padding] == :fill
      out = out[0...3]
    elsif emojis[3][:padding] == :last
      out = out[0...4]
    end

    result.concat(out)
  end

  result.pack('C*').force_encoding(encoding)
end

.encode(data, version: 2) ⇒ Object 



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# File 'lib/ecoji.rb', line 42

def self.encode(data, version: 2)
  case version
  when 1
    emojis = Emojis::V1
    padding_last = PADDING_LAST_V1
    trim = false
  when 2
    emojis = Emojis::V2
    padding_last = PADDING_LAST_V2
    trim = true
  else
    raise Error, 'Version must be either 1 or 2'
  end

  result = []
  data.bytes.each_slice(5) do |s|
    encode_five(s, emojis, padding_last, trim) { |n| result << n }
  end
  result.pack('U*')
end