catstodon/app/lib/language_detector.rb

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# frozen_string_literal: true
class LanguageDetector
include Singleton
def initialize
@identifier = CLD3::NNetLanguageIdentifier.new(1, 2048)
end
def detect(text, account)
detect_language_code(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 detect_language_code(text)
result = @identifier.find_language(prepare_text(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)
text.dup.tap do |new_text|
new_text.gsub!(FetchLinkCardService::URL_PATTERN, '')
new_text.gsub!(Account::MENTION_RE, '')
new_text.gsub!(Tag::HASHTAG_RE, '')
new_text.gsub!(/\s+/, ' ')
end
end
def default_locale(account)
account.user_locale&.to_sym
end
end