aboutsummaryrefslogtreecommitdiffstats
path: root/actionview/lib/action_view/helpers/translation_helper.rb
blob: e663892592728dd7e3e78c8b0871dec942fe0af0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
# frozen_string_literal: true

require_relative "tag_helper"
require "active_support/core_ext/string/access"
require "i18n/exceptions"

module ActionView
  # = Action View Translation Helpers
  module Helpers #:nodoc:
    module TranslationHelper
      extend ActiveSupport::Concern

      include TagHelper

      included do
        mattr_accessor :debug_missing_translation, default: true
      end

      # Delegates to <tt>I18n#translate</tt> but also performs three additional
      # functions.
      #
      # First, it will ensure that any thrown +MissingTranslation+ messages will
      # be rendered as inline spans that:
      #
      # * Have a <tt>translation-missing</tt> class applied
      # * Contain the missing key as the value of the +title+ attribute
      # * Have a titleized version of the last key segment as text
      #
      # For example, the value returned for the missing translation key
      # <tt>"blog.post.title"</tt> will be:
      #
      #    <span
      #      class="translation_missing"
      #      title="translation missing: en.blog.post.title">Title</span>
      #
      # This allows for views to display rather reasonable strings while still
      # giving developers a way to find missing translations.
      #
      # If you would prefer missing translations to raise an error, you can
      # opt out of span-wrapping behavior globally by setting
      # <tt>ActionView::Base.raise_on_missing_translations = true</tt> or
      # individually by passing <tt>raise: true</tt> as an option to
      # <tt>translate</tt>.
      #
      # Second, if the key starts with a period <tt>translate</tt> will scope
      # the key by the current partial. Calling <tt>translate(".foo")</tt> from
      # the <tt>people/index.html.erb</tt> template is equivalent to calling
      # <tt>translate("people.index.foo")</tt>. This makes it less
      # repetitive to translate many keys within the same partial and provides
      # a convention to scope keys consistently.
      #
      # Third, the translation will be marked as <tt>html_safe</tt> if the key
      # has the suffix "_html" or the last element of the key is "html". Calling
      # <tt>translate("footer_html")</tt> or <tt>translate("footer.html")</tt>
      # will return an HTML safe string that won't be escaped by other HTML
      # helper methods. This naming convention helps to identify translations
      # that include HTML tags so that you know what kind of output to expect
      # when you call translate in a template and translators know which keys
      # they can provide HTML values for.
      def translate(key, options = {})
        options = options.dup
        has_default = options.has_key?(:default)
        remaining_defaults = Array(options.delete(:default)).compact

        if has_default && !remaining_defaults.first.kind_of?(Symbol)
          options[:default] = remaining_defaults
        end

        # If the user has explicitly decided to NOT raise errors, pass that option to I18n.
        # Otherwise, tell I18n to raise an exception, which we rescue further in this method.
        # Note: `raise_error` refers to us re-raising the error in this method. I18n is forced to raise by default.
        if options[:raise] == false
          raise_error = false
          i18n_raise = false
        else
          raise_error = options[:raise] || ActionView::Base.raise_on_missing_translations
          i18n_raise = true
        end

        if html_safe_translation_key?(key)
          html_safe_options = options.dup
          options.except(*I18n::RESERVED_KEYS).each do |name, value|
            unless name == :count && value.is_a?(Numeric)
              html_safe_options[name] = ERB::Util.html_escape(value.to_s)
            end
          end
          translation = I18n.translate(scope_key_by_partial(key), html_safe_options.merge(raise: i18n_raise))

          translation.respond_to?(:html_safe) ? translation.html_safe : translation
        else
          I18n.translate(scope_key_by_partial(key), options.merge(raise: i18n_raise))
        end
      rescue I18n::MissingTranslationData => e
        if remaining_defaults.present?
          translate remaining_defaults.shift, options.merge(default: remaining_defaults)
        else
          raise e if raise_error

          keys = I18n.normalize_keys(e.locale, e.key, e.options[:scope])
          title = "translation missing: #{keys.join('.')}".dup

          interpolations = options.except(:default, :scope)
          if interpolations.any?
            title << ", " << interpolations.map { |k, v| "#{k}: #{ERB::Util.html_escape(v)}" }.join(", ")
          end

          return title unless ActionView::Base.debug_missing_translation

          content_tag("span", keys.last.to_s.titleize, class: "translation_missing", title: title)
        end
      end
      alias :t :translate

      # Delegates to <tt>I18n.localize</tt> with no additional functionality.
      #
      # See http://rubydoc.info/github/svenfuchs/i18n/master/I18n/Backend/Base:localize
      # for more information.
      def localize(*args)
        I18n.localize(*args)
      end
      alias :l :localize

      private
        def scope_key_by_partial(key)
          if key.to_s.first == "."
            if @virtual_path
              @virtual_path.gsub(%r{/_?}, ".") + key.to_s
            else
              raise "Cannot use t(#{key.inspect}) shortcut because path is not available"
            end
          else
            key
          end
        end

        def html_safe_translation_key?(key)
          /(\b|_|\.)html$/.match?(key.to_s)
        end
    end
  end
end