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# coding: utf-8
# Copyright Ayumu Nojima (野島 歩) and Martin J. Dürst (duerst@it.aoyama.ac.jp)
# additions to class String for Unicode normalization
class String
# === Unicode Normalization
#
# :call-seq:
# str.unicode_normalize(form=:nfc)
#
# Returns a normalized form of +str+, using Unicode normalizations
# NFC, NFD, NFKC, or NFKD. The normalization form used is determined
# by +form+, which is any of the four values :nfc, :nfd, :nfkc, or :nfkd.
# The default is :nfc.
#
# If the string is not in a Unicode Encoding, then an Exception is raised.
# In this context, 'Unicode Encoding' means any of UTF-8, UTF-16BE/LE,
# and UTF-32BE/LE, as well as GB18030, UCS_2BE, and UCS_4BE. Anything
# else than UTF-8 is implemented by converting to UTF-8,
# which makes it slower than UTF-8.
#
# _Examples_
#
# "a\u0300".unicode_normalize #=> 'à' (same as "\u00E0")
# "a\u0300".unicode_normalize(:nfc) #=> 'à' (same as "\u00E0")
# "\u00E0".unicode_normalize(:nfd) #=> 'à' (same as "a\u0300")
# "\xE0".force_encoding('ISO-8859-1').unicode_normalize(:nfd)
# #=> Encoding::CompatibilityError raised
#
def unicode_normalize(form = :nfc)
require 'unicode_normalize/normalize.rb' unless defined? UnicodeNormalize
## The following line can be uncommented to avoid repeated checking for
## UnicodeNormalize. However, tests didn't show any noticeable speedup
## when doing this. This comment also applies to the commented out lines
## in String#unicode_normalize! and String#unicode_normalized?.
# String.send(:define_method, :unicode_normalize, ->(form = :nfc) { UnicodeNormalize.normalize(self, form) } )
UnicodeNormalize.normalize(self, form)
end
# :call-seq:
# str.unicode_normalize!(form=:nfc)
#
# Destructive version of String#unicode_normalize, doing Unicode
# normalization in place.
#
def unicode_normalize!(form = :nfc)
require 'unicode_normalize/normalize.rb' unless defined? UnicodeNormalize
# String.send(:define_method, :unicode_normalize!, ->(form = :nfc) { replace(unicode_normalize(form)) } )
replace(unicode_normalize(form))
end
# :call-seq:
# str.unicode_normalized?(form=:nfc)
#
# Checks whether +str+ is in Unicode normalization form +form+,
# which is any of the four values :nfc, :nfd, :nfkc, or :nfkd.
# The default is :nfc.
#
# If the string is not in a Unicode Encoding, then an Exception is raised.
# For details, see String#unicode_normalize.
#
# _Examples_
#
# "a\u0300".unicode_normalized? #=> false
# "a\u0300".unicode_normalized?(:nfd) #=> true
# "\u00E0".unicode_normalized? #=> true
# "\u00E0".unicode_normalized?(:nfd) #=> false
# "\xE0".force_encoding('ISO-8859-1').unicode_normalized?
# #=> Encoding::CompatibilityError raised
#
def unicode_normalized?(form = :nfc)
require 'unicode_normalize/normalize.rb' unless defined? UnicodeNormalize
# String.send(:define_method, :unicode_normalized?, ->(form = :nfc) { UnicodeNormalize.normalized?(self, form) } )
UnicodeNormalize.normalized?(self, form)
end
end