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module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module String #:nodoc:
unless '1.9'.respond_to?(:force_encoding)
# Define methods for handling unicode data.
module Unicode
def self.append_features(base)
if '1.8.7'.respond_to?(:chars)
base.class_eval { remove_method :chars }
end
super
end
# +chars+ is a Unicode safe proxy for string methods. 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. Undefined methods are forwarded to String, so all of the
# string overrides can also be called through the +chars+ proxy.
#
# name = 'Claus Müller'
# name.reverse #=> "rell??M sualC"
# name.length #=> 13
#
# name.chars.reverse.to_s #=> "rellüM sualC"
# name.chars.length #=> 12
#
#
# 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.chars.reverse.length #=> 12
#
# The Char 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 and
# ActiveSupport::Multibyte::Handlers::UTF8Handler.
def chars
ActiveSupport::Multibyte::Chars.new(self)
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::Handlers::UTF8Handler.consumes?(self)
end
end
else
module Unicode #:nodoc:
def chars
self
end
def is_utf8?
case encoding
when Encoding::UTF_8
valid_encoding?
when Encoding::ASCII_8BIT
dup.force_encoding('UTF-8').valid_encoding?
else
false
end
end
end
end
end
end
end
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