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# encoding: utf-8
require 'active_support/core_ext/string/multibyte'
module ActiveSupport
module Inflector
# Replaces non-ASCII characters with an ASCII approximation, or if none
# exists, a replacement character which defaults to "?".
#
# transliterate("Ærøskøbing")
# # => "AEroskobing"
#
# Default approximations are provided for Western/Latin characters,
# e.g, "ø", "ñ", "é", "ß", etc.
#
# This method is I18n aware, so you can set up custom approximations for a
# locale. This can be useful, for example, to transliterate German's "ü"
# and "ö" to "ue" and "oe", or to add support for transliterating Russian
# to ASCII.
#
# In order to make your custom transliterations available, you must set
# them as the <tt>i18n.transliterate.rule</tt> i18n key:
#
# # Store the transliterations in locales/de.yml
# i18n:
# transliterate:
# :rule
# ü: "ue"
# ö: "oe"
#
# # Or set them using Ruby
# I18n.backend.store_translations(:de, :i18n => {
# :transliterate => {
# :rule => {
# "ü" => "ue",
# "ö" => "oe"
# }
# }
# })
#
# The value for <tt>i18n.transliterate.rule</tt> can be a simple Hash that maps
# characters to ASCII approximations as shown above, or, for more complex
# requirements, a Proc:
#
# I18n.backend.store_translations(:de, :i18n => {
# :transliterate => {
# :rule => lambda {|string| MyTransliterator.transliterate(string)}
# }
# })
#
# Now you can have different transliterations for each locale:
#
# I18n.locale = :en
# transliterate("Jürgen")
# # => "Jurgen"
#
# I18n.locale = :de
# transliterate("Jürgen")
# # => "Juergen"
def transliterate(string, replacement = "?")
I18n.transliterate(Multibyte::Chars.normalize(
Multibyte::Chars.tidy_bytes(string), :c), :replacement => replacement)
end
# Replaces special characters in a string so that it may be used as part of a 'pretty' URL.
#
# ==== Examples
#
# class Person
# def to_param
# "#{id}-#{name.parameterize}"
# end
# end
#
# @person = Person.find(1)
# # => #<Person id: 1, name: "Donald E. Knuth">
#
# <%= link_to(@person.name, person_path(@person)) %>
# # => <a href="/person/1-donald-e-knuth">Donald E. Knuth</a>
def parameterize(string, sep = '-')
# replace accented chars with their ascii equivalents
parameterized_string = transliterate(string)
# Turn unwanted chars into the separator
parameterized_string.gsub!(/[^a-z0-9\-_]+/i, sep)
unless sep.nil? || sep.empty?
re_sep = Regexp.escape(sep)
# No more than one of the separator in a row.
parameterized_string.gsub!(/#{re_sep}{2,}/, sep)
# Remove leading/trailing separator.
parameterized_string.gsub!(/^#{re_sep}|#{re_sep}$/i, '')
end
parameterized_string.downcase
end
end
end
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