discourse/spec/components/js_locale_helper_spec.rb

require 'rails_helper'
require_dependency 'js_locale_helper'

describe JsLocaleHelper do

  module StubLoadTranslations
    def set_translations(locale, translations)
      @loaded_translations ||= HashWithIndifferentAccess.new
      @loaded_translations[locale] = translations
    end

    def clear_cache!
      @loaded_translations = nil
      @loaded_merges = nil
    end
  end
  JsLocaleHelper.extend StubLoadTranslations

  after do
    JsLocaleHelper.clear_cache!
  end

  it 'should be able to generate translations' do
    expect(JsLocaleHelper.output_locale('en').length).to be > 0
  end

  def setup_message_format(format)
    @ctx = V8::Context.new
    @ctx.eval('MessageFormat = {locale: {}};')
    @ctx.load(Rails.root + 'lib/javascripts/locale/en.js')
    compiled = JsLocaleHelper.compile_message_format('en', format)
    @ctx.eval("var test = #{compiled}")
  end

  def localize(opts)
    @ctx.eval("test(#{opts.to_json})")
  end

  it 'handles plurals' do
    setup_message_format('{NUM_RESULTS, plural,
            one {1 result}
          other {# results}
        }')
    expect(localize(NUM_RESULTS: 1)).to eq('1 result')
    expect(localize(NUM_RESULTS: 2)).to eq('2 results')
  end

  it 'handles double plurals' do
    setup_message_format('{NUM_RESULTS, plural,
            one {1 result}
          other {# results}
        } and {NUM_APPLES, plural,
            one {1 apple}
          other {# apples}
        }')


    expect(localize(NUM_RESULTS: 1, NUM_APPLES: 2)).to eq('1 result and 2 apples')
    expect(localize(NUM_RESULTS: 2, NUM_APPLES: 1)).to eq('2 results and 1 apple')
  end

  it 'handles select' do
    setup_message_format('{GENDER, select, male {He} female {She} other {They}} read a book')
    expect(localize(GENDER: 'male')).to eq('He read a book')
    expect(localize(GENDER: 'female')).to eq('She read a book')
    expect(localize(GENDER: 'none')).to eq('They read a book')
  end

  it 'can strip out message formats' do
    hash = {"a" => "b", "c" => { "d" => {"f_MF" => "bob"} }}
    expect(JsLocaleHelper.strip_out_message_formats!(hash)).to eq({"c.d.f_MF" => "bob"})
    expect(hash["c"]["d"]).to eq({})
  end

  it 'handles message format special keys' do
    ctx = V8::Context.new
    ctx.eval("I18n = {};")

    JsLocaleHelper.set_translations 'en', {
      "en" =>
        {
          "js" => {
            "hello" => "world",
            "test_MF" => "{HELLO} {COUNT, plural, one {1 duck} other {# ducks}}",
            "error_MF" => "{{BLA}",
            "simple_MF" => "{COUNT, plural, one {1} other {#}}"
          }
        }
    }

    ctx.eval(JsLocaleHelper.output_locale('en'))

    expect(ctx.eval('I18n.translations["en"]["js"]["hello"]')).to eq("world")
    expect(ctx.eval('I18n.translations["en"]["js"]["test_MF"]')).to eq(nil)

    expect(ctx.eval('I18n.messageFormat("test_MF", { HELLO: "hi", COUNT: 3 })')).to eq("hi 3 ducks")
    expect(ctx.eval('I18n.messageFormat("error_MF", { HELLO: "hi", COUNT: 3 })')).to match(/Invalid Format/)
    expect(ctx.eval('I18n.messageFormat("missing", {})')).to match(/missing/)
    expect(ctx.eval('I18n.messageFormat("simple_MF", {})')).to match(/COUNT/) # error
  end

  it 'load pluralizations rules before precompile' do
    message = JsLocaleHelper.compile_message_format('ru', 'format')
    expect(message).not_to match 'Plural Function not found'
  end

  it 'performs fallbacks to english if a translation is not available' do
    JsLocaleHelper.set_translations 'en', {
      "en" => {
        "js" => {
          "only_english"      => "1-en",
          "english_and_site"  => "3-en",
          "english_and_user"  => "5-en",
          "all_three"         => "7-en",
        }
      }
    }
    JsLocaleHelper.set_translations 'ru', {
      "ru" => {
        "js" => {
          "only_site"         => "2-ru",
          "english_and_site"  => "3-ru",
          "site_and_user"     => "6-ru",
          "all_three"         => "7-ru",
        }
      }
    }
    JsLocaleHelper.set_translations 'uk', {
      "uk" => {
        "js" => {
          "only_user"         => "4-uk",
          "english_and_user"  => "5-uk",
          "site_and_user"     => "6-uk",
          "all_three"         => "7-uk",
        }
      }
    }

    expected = {
      "none"              => "[uk.js.none]",
      "only_english"      => "1-en",
      "only_site"         => "2-ru",
      "english_and_site"  => "3-ru",
      "only_user"         => "4-uk",
      "english_and_user"  => "5-uk",
      "site_and_user"     => "6-uk",
      "all_three"         => "7-uk",
    }

    SiteSetting.default_locale = 'ru'
    I18n.locale = :uk

    ctx = V8::Context.new
    ctx.eval('var window = this;')
    ctx.load(Rails.root + 'app/assets/javascripts/locales/i18n.js')
    ctx.eval(JsLocaleHelper.output_locale(I18n.locale))
    ctx.eval('I18n.defaultLocale = "ru";')

    # Test - unneeded translations are not emitted
    expect(ctx.eval('I18n.translations.en.js').keys).to eq(["only_english"])
    expect(ctx.eval('I18n.translations.ru.js').keys).to eq(["only_site", "english_and_site"])

    expected.each do |key, expect|
      expect(ctx.eval("I18n.t(#{"js.#{key}".inspect})")).to eq(expect)
    end
  end

  LocaleSiteSetting.values.each do |locale|
    it "generates valid date helpers for #{locale[:value]} locale" do
      js = JsLocaleHelper.output_locale(locale[:value])
      ctx = V8::Context.new
      ctx.eval('var window = this;')
      ctx.load(Rails.root + 'app/assets/javascripts/locales/i18n.js')
      ctx.eval(js)
    end
  end

end