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require 'action_view/helpers/tag_helper'
require 'i18n/exceptions'
module I18n
class ExceptionHandler
include Module.new {
def call(exception, locale, key, options)
exception.is_a?(MissingTranslationData) ? super.html_safe : super
end
}
end
end
module ActionView
# = Action View Translation Helpers
module Helpers
module TranslationHelper
# Delegates to I18n#translate but also performs three additional functions.
#
# First, it'll pass the :rescue_format => :html option to I18n so that any caught
# MissingTranslationData exceptions will be turned into inline spans that
#
# * have a "translation-missing" class set,
# * contain the missing key as a title attribute and
# * a titleized version of the last key segment as a text.
#
# E.g. the value returned for a missing translation key :"blog.post.title" will be
# <span class="translation_missing" title="translation missing: blog.post.title">Title</span>.
# This way your views will display rather reasonableful strings but it will still
# be easy to spot missing translations.
#
# Second, it'll scope the key by the current partial if the key starts
# with a period. So if you call <tt>translate(".foo")</tt> from the
# <tt>people/index.html.erb</tt> template, you'll actually be calling
# <tt>I18n.translate("people.index.foo")</tt>. 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 = {})
options.merge!(:rescue_format => :html) unless options.key?(:rescue_format)
translation = I18n.translate(scope_key_by_partial(key), options)
if html_safe_translation_key?(key) && translation.respond_to?(:html_safe)
translation.html_safe
else
translation
end
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 (path = @_template && @_template.virtual_path)
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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