nyastodon/app/lib/language_detector.rb
Eugen Rochko 1caf11ddcc Fix language filter codes (#4841)
* Fix language filter codes

CLD3 returns BCP-47 language identifier, filter settings expect
identifiers in the ISO 639-1 format. Convert between formats,
and exclude duplicate languages from filter choices (zh-CN->zh)

* Fix zh name
2017-09-08 12:32:22 +02:00

55 lines
1.1 KiB
Ruby

# frozen_string_literal: true
class LanguageDetector
attr_reader :text, :account
def initialize(text, account = nil)
@text = text
@account = account
@identifier = CLD3::NNetLanguageIdentifier.new(1, 2048)
end
def to_iso_s
detected_language_code || default_locale
end
def prepared_text
simplified_text.strip
end
private
def detected_language_code
iso6391(result.language).to_sym if detected_language_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 result
@result ||= @identifier.find_language(prepared_text)
end
def detected_language_reliable?
result.reliable?
end
def simplified_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&.user_locale&.to_sym || nil
end
end