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require 'action_view/helpers/tag_helper'
module ActionView
module Helpers
module TranslationHelper
# Delegates to I18n#translate but also performs three additional functions. First, it'll catch MissingTranslationData exceptions
# and turn them into inline spans that contains the missing key, such that you can see in a view what is missing where.
#
# Second, it'll scope the key by the current partial if the key starts with a period. So if you call translate(".foo") from the
# people/index.html.erb template, you'll actually be calling I18n.translate("people.index.foo"). This makes it less repetitive
# to translate many keys within the same partials and gives you a simple framework for scoping them consistently. If you don't
# prepend the key with a period, nothing is converted.
#
# Third, it’ll mark the translation as safe HTML if the key has the suffix "_html" or the last element of the key is the word
# "html". For example, calling translate("footer_html") or translate("footer.html") will return a safe HTML 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.
def translate(key, options = {})
translation = I18n.translate(scope_key_by_partial(key), options.merge!(:raise => true))
if html_safe_translation_key?(key) && translation.respond_to?(:html_safe)
translation.html_safe
else
translation
end
rescue I18n::MissingTranslationData => e
keys = I18n.normalize_keys(e.locale, e.key, e.options[:scope])
content_tag('span', keys.join(', '), :class => 'translation_missing')
end
alias :t :translate
# Delegates to I18n.localize with no additional functionality.
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)
key.to_s =~ /(\b|_|\.)html$/
end
end
end
end
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