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# encoding: utf-8
require 'active_support/core_ext/string/multibyte'
module ActiveSupport
module Inflector
extend self
# UTF-8 byte => ASCII approximate UTF-8 byte(s)
ASCII_APPROXIMATIONS = {
198 => [65, 69], # Æ => AE
208 => 68, # Ð => D
216 => 79, # Ø => O
222 => [84, 104], # Þ => Þ
223 => [115, 115], # ß => ss
230 => [97, 101], # æ => ae
240 => 100, # ð => d
248 => 111, # ø => o
254 => [116, 104], # þ => th
272 => 68, # Đ => D
273 => 100, # đ => đ
294 => 72, # Ħ => H
295 => 104, # ħ => h
305 => 105, # ı => i
306 => [73, 74], # IJ =>IJ
307 => [105, 106], # ij => ij
312 => 107, # ĸ => k
319 => 76, # Ŀ => L
320 => 108, # ŀ => l
321 => 76, # Ł => L
322 => 108, # ł => l
329 => 110, # ʼn => n
330 => [78, 71], # Ŋ => NG
331 => [110, 103], # ŋ => ng
338 => [79, 69], # Π=> OE
339 => [111, 101], # œ => oe
358 => 84, # Ŧ => T
359 => 116 # ŧ => t
}
# Replaces accented characters with an ASCII approximation, or deletes it if none exsits.
def transliterate(string)
ActiveSupport::Multibyte::Chars.new(string).tidy_bytes.normalize(:d).unpack("U*").map do |char|
ASCII_APPROXIMATIONS[char] || (char if char < 128)
end.compact.flatten.pack("U*")
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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