/usr/lib/ruby/vendor_ruby/active_support/core_ext/string/multibyte.rb is in ruby-activesupport-3.2 3.2.16-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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require 'active_support/multibyte'
class String
if RUBY_VERSION >= "1.9"
# == Multibyte proxy
#
# +mb_chars+ is a multibyte safe proxy for string methods.
#
# In Ruby 1.8 and older it creates and returns an instance of the ActiveSupport::Multibyte::Chars class which
# encapsulates the original string. A Unicode safe version of all the String methods are defined on this proxy
# class. If the proxy class doesn't respond to a certain method, it's forwarded to the encapsulated string.
#
# name = 'Claus Müller'
# name.reverse # => "rell??M sualC"
# name.length # => 13
#
# name.mb_chars.reverse.to_s # => "rellüM sualC"
# name.mb_chars.length # => 12
#
# In Ruby 1.9 and newer +mb_chars+ returns +self+ because String is (mostly) encoding aware. This means that
# it becomes easy to run one version of your code on multiple Ruby versions.
#
# == Method chaining
#
# All the methods on the Chars proxy which normally return a string will return a Chars object. This allows
# method chaining on the result of any of these methods.
#
# name.mb_chars.reverse.length # => 12
#
# == Interoperability and configuration
#
# The Chars object tries to be as interchangeable with String objects as possible: sorting and comparing between
# String and Char work like expected. The bang! methods change the internal string representation in the Chars
# object. Interoperability problems can be resolved easily with a +to_s+ call.
#
# For more information about the methods defined on the Chars proxy see ActiveSupport::Multibyte::Chars. For
# information about how to change the default Multibyte behavior see ActiveSupport::Multibyte.
def mb_chars
if ActiveSupport::Multibyte.proxy_class.consumes?(self)
ActiveSupport::Multibyte.proxy_class.new(self)
else
self
end
end
def is_utf8?
case encoding
when Encoding::UTF_8
valid_encoding?
when Encoding::ASCII_8BIT, Encoding::US_ASCII
dup.force_encoding(Encoding::UTF_8).valid_encoding?
else
false
end
end
else
def mb_chars
if ActiveSupport::Multibyte.proxy_class.wants?(self)
ActiveSupport::Multibyte.proxy_class.new(self)
else
self
end
end
# Returns true if the string has UTF-8 semantics (a String used for purely byte resources is unlikely to have
# them), returns false otherwise.
def is_utf8?
ActiveSupport::Multibyte::Chars.consumes?(self)
end
end
end
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