Remove language detection through cld3 (#17478)
* Remove language detection through cld3 * Update app/helpers/languages_helper.rb Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh> Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>main
Eugen Rochko
3 years ago
committed by
GitHub
parent
85b86fe28c
commit
b6d7726ecb
@ -1,101 +0,0 @@
|
||||
# frozen_string_literal: true
|
||||
|
||||
class LanguageDetector
|
||||
include Singleton
|
||||
|
||||
WORDS_THRESHOLD = 4
|
||||
RELIABLE_CHARACTERS_RE = /[\p{Hebrew}\p{Arabic}\p{Syriac}\p{Thaana}\p{Nko}\p{Han}\p{Katakana}\p{Hiragana}\p{Hangul}\p{Thai}]+/m
|
||||
|
||||
def initialize
|
||||
@identifier = CLD3::NNetLanguageIdentifier.new(1, 2048)
|
||||
end
|
||||
|
||||
def detect(text, account)
|
||||
input_text = prepare_text(text)
|
||||
|
||||
return if input_text.blank?
|
||||
|
||||
detect_language_code(input_text) || default_locale(account)
|
||||
end
|
||||
|
||||
def language_names
|
||||
@language_names = CLD3::TaskContextParams::LANGUAGE_NAMES.map { |name| iso6391(name.to_s).to_sym }.uniq
|
||||
end
|
||||
|
||||
private
|
||||
|
||||
def prepare_text(text)
|
||||
simplify_text(text).strip
|
||||
end
|
||||
|
||||
def unreliable_input?(text)
|
||||
!reliable_input?(text)
|
||||
end
|
||||
|
||||
def reliable_input?(text)
|
||||
sufficient_text_length?(text) || language_specific_character_set?(text)
|
||||
end
|
||||
|
||||
def sufficient_text_length?(text)
|
||||
text.split(/\s+/).size >= WORDS_THRESHOLD
|
||||
end
|
||||
|
||||
def language_specific_character_set?(text)
|
||||
words = text.scan(RELIABLE_CHARACTERS_RE)
|
||||
|
||||
if words.present?
|
||||
words.reduce(0) { |acc, elem| acc + elem.size }.to_f / text.size > 0.3
|
||||
else
|
||||
false
|
||||
end
|
||||
end
|
||||
|
||||
def detect_language_code(text)
|
||||
return if unreliable_input?(text)
|
||||
|
||||
result = @identifier.find_language(text)
|
||||
|
||||
iso6391(result.language.to_s).to_sym if result&.reliable?
|
||||
end
|
||||
|
||||
def iso6391(bcp47)
|
||||
iso639 = bcp47.split('-').first
|
||||
|
||||
# CLD3 returns grandfathered language code for Hebrew
|
||||
return 'he' if iso639 == 'iw'
|
||||
|
||||
ISO_639.find(iso639).alpha2
|
||||
end
|
||||
|
||||
def simplify_text(text)
|
||||
new_text = remove_html(text)
|
||||
new_text.gsub!(FetchLinkCardService::URL_PATTERN, '\1')
|
||||
new_text.gsub!(Account::MENTION_RE, '')
|
||||
new_text.gsub!(Tag::HASHTAG_RE) { |string| string.gsub(/[#_]/, '#' => '', '_' => ' ').gsub(/[a-z][A-Z]|[a-zA-Z][\d]/) { |s| s.insert(1, ' ') }.downcase }
|
||||
new_text.gsub!(/:#{CustomEmoji::SHORTCODE_RE_FRAGMENT}:/, '')
|
||||
new_text.gsub!(/\s+/, ' ')
|
||||
new_text
|
||||
end
|
||||
|
||||
def new_scrubber
|
||||
scrubber = Rails::Html::PermitScrubber.new
|
||||
scrubber.tags = %w(br p)
|
||||
scrubber
|
||||
end
|
||||
|
||||
def scrubber
|
||||
@scrubber ||= new_scrubber
|
||||
end
|
||||
|
||||
def remove_html(text)
|
||||
text = Loofah.fragment(text).scrub!(scrubber).to_s
|
||||
text.gsub!('<br>', "\n")
|
||||
text.gsub!('</p><p>', "\n\n")
|
||||
text.gsub!(/(^<p>|<\/p>$)/, '')
|
||||
text
|
||||
end
|
||||
|
||||
def default_locale(account)
|
||||
account.user_locale&.to_sym || I18n.default_locale if account.local?
|
||||
end
|
||||
end
|
||||
@ -1,134 +0,0 @@
|
||||
# frozen_string_literal: true
|
||||
|
||||
require 'rails_helper'
|
||||
|
||||
describe LanguageDetector do
|
||||
describe 'prepare_text' do
|
||||
it 'returns unmodified string without special cases' do
|
||||
string = 'just a regular string'
|
||||
result = described_class.instance.send(:prepare_text, string)
|
||||
|
||||
expect(result).to eq string
|
||||
end
|
||||
|
||||
it 'collapses spacing in strings' do
|
||||
string = 'The formatting in this is very odd'
|
||||
|
||||
result = described_class.instance.send(:prepare_text, string)
|
||||
expect(result).to eq 'The formatting in this is very odd'
|
||||
end
|
||||
|
||||
it 'strips usernames from strings before detection' do
|
||||
string = '@username Yeah, very surreal...! also @friend'
|
||||
|
||||
result = described_class.instance.send(:prepare_text, string)
|
||||
expect(result).to eq 'Yeah, very surreal...! also'
|
||||
end
|
||||
|
||||
it 'strips URLs from strings before detection' do
|
||||
string = 'Our website is https://example.com and also http://localhost.dev'
|
||||
|
||||
result = described_class.instance.send(:prepare_text, string)
|
||||
expect(result).to eq 'Our website is and also'
|
||||
end
|
||||
|
||||
it 'converts #hashtags back to normal text before detection' do
|
||||
string = 'Hey look at all the #animals and #FishAndChips'
|
||||
|
||||
result = described_class.instance.send(:prepare_text, string)
|
||||
expect(result).to eq 'Hey look at all the animals and fish and chips'
|
||||
end
|
||||
end
|
||||
|
||||
describe 'detect' do
|
||||
let(:account_without_user_locale) { Fabricate(:user, locale: nil).account }
|
||||
let(:account_remote) { Fabricate(:account, domain: 'joinmastodon.org') }
|
||||
|
||||
it 'detects english language for basic strings' do
|
||||
strings = [
|
||||
"Hello and welcome to mastodon how are you today?",
|
||||
"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.instance.detect(string, account_without_user_locale)
|
||||
|
||||
expect(result).to eq(:en), string
|
||||
end
|
||||
end
|
||||
|
||||
it 'detects spanish language' do
|
||||
string = 'Obtener un Hola y bienvenidos a Mastodon. Obtener un Hola y bienvenidos a Mastodon. Obtener un Hola y bienvenidos a Mastodon. Obtener un Hola y bienvenidos a Mastodon'
|
||||
result = described_class.instance.detect(string, account_without_user_locale)
|
||||
|
||||
expect(result).to eq :es
|
||||
end
|
||||
|
||||
describe 'when language can\'t be detected' do
|
||||
it 'uses nil when sent an empty document' do
|
||||
result = described_class.instance.detect('', account_without_user_locale)
|
||||
expect(result).to eq nil
|
||||
end
|
||||
|
||||
describe 'because of a URL' do
|
||||
it 'uses nil 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.instance.detect(string, account_without_user_locale)
|
||||
|
||||
expect(result).to eq nil
|
||||
end
|
||||
end
|
||||
|
||||
describe 'with an account' do
|
||||
it 'uses the account locale when present' do
|
||||
account = double(user_locale: 'fr')
|
||||
result = described_class.instance.detect('', account)
|
||||
|
||||
expect(result).to eq nil
|
||||
end
|
||||
|
||||
it 'uses nil when account is present but has no locale' do
|
||||
result = described_class.instance.detect('', account_without_user_locale)
|
||||
|
||||
expect(result).to eq nil
|
||||
end
|
||||
end
|
||||
|
||||
describe 'with an `en` default locale' do
|
||||
it 'uses nil for undetectable string' do
|
||||
result = described_class.instance.detect('', account_without_user_locale)
|
||||
|
||||
expect(result).to eq nil
|
||||
end
|
||||
end
|
||||
|
||||
describe 'remote user' do
|
||||
it 'detects Korean language' do
|
||||
string = '안녕하세요'
|
||||
result = described_class.instance.detect(string, account_remote)
|
||||
|
||||
expect(result).to eq :ko
|
||||
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 nil for undetectable string' do
|
||||
string = ''
|
||||
result = described_class.instance.detect(string, account_without_user_locale)
|
||||
|
||||
expect(result).to eq nil
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
Loading…
Reference in new issue