masto-fe/spec/lib/language_detector_spec.rb
Akihiko Odaki d5cabfe5c6 Use CLD3 (#2949)
Compact Language Detector v3 (CLD3) is the successor of CLD2, which was
used in the previous implementation. CLD3 includes improvements since CLD2,
and supports newer compilers. On the other hand, it has additional
requirements and cld3-ruby, the FFI of CLD3 for Ruby, is still new and may
be still inmature.

Though CLD3 is named after CLD2, it is implemented with a neural network
model, different from the old implementation, which is based on a Naïve
Bayesian classifier.

CLD3 supports newer compilers, such as GCC 6. CLD2 is not compatible with
GCC 6 because it assigns negative values to varibales typed unsigned.
(see internal/cld_generated_cjk_uni_prop_80.cc) The support for GCC 6 and
newer compilers are essential today, when some server operating system
such as Ubuntu Server 16.10 has GCC 6 by default.

On the one hand, CLD3 requires C++11 support. Environments with old
compilers such as Ubuntu Server 14.04 needs to update the system or install
a newer compiler.

CLD3 needs protocol buffers as a new dependency. However,it is not
considered problematic because major server operating systems, CentOS and
Ubuntu Server provide them.

The FFI cld3-ruby was written by me (Akihiko Odaki) for use in Mastodon.
It is still new and may be inmature, but confirmed to pass existing tests.
2017-05-09 19:58:03 +02:00

86 lines
2.4 KiB
Ruby

# frozen_string_literal: true
require 'rails_helper'
describe LanguageDetector do
describe 'to_iso_s' do
it 'detects english language for basic strings' do
strings = [
"Hello and welcome to mastodon",
"I'd rather not!",
"a lot of people just want to feel righteous all the time and that's all that matters",
]
strings.each do |string|
result = described_class.new(string).to_iso_s
expect(result).to eq(:en), string
end
end
it 'detects spanish language' do
string = 'Obtener un Hola y bienvenidos a Mastodon'
result = described_class.new(string).to_iso_s
expect(result).to eq :es
end
describe 'when language can\'t be detected' do
it 'uses default locale when sent an empty document' do
result = described_class.new('').to_iso_s
expect(result).to eq :en
end
describe 'because of a URL' do
it 'uses default locale when sent just a URL' do
string = 'http://example.com/media/2kFTgOJLXhQf0g2nKB4'
cld_result = CLD3::NNetLanguageIdentifier.new(0, 2048).find_language(string)
expect(cld_result).not_to eq :en
result = described_class.new(string).to_iso_s
expect(result).to eq :en
end
end
describe 'with an account' do
it 'uses the account locale when present' do
account = double(user_locale: 'fr')
result = described_class.new('', account).to_iso_s
expect(result).to eq :fr
end
it 'uses default locale when account is present but has no locale' do
account = double(user_locale: nil)
result = described_class.new('', account).to_iso_s
expect(result).to eq :en
end
end
describe 'with an `en` default locale' do
it 'uses the default locale' do
string = ''
result = described_class.new(string).to_iso_s
expect(result).to eq :en
end
end
describe 'with a non-`en` default locale' do
around(:each) do |example|
before = I18n.default_locale
I18n.default_locale = :ja
example.run
I18n.default_locale = before
end
it 'uses the default locale' do
string = ''
result = described_class.new(string).to_iso_s
expect(result).to eq :ja
end
end
end
end
end