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# frozen_string_literal: true
require "active_support/multibyte"
class String
# == Multibyte proxy
#
# +mb_chars+ is a multibyte 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. If the proxy class doesn't respond to a certain method, it's forwarded to the encapsulated string.
#
# >> "lj".upcase
# => "lj"
# >> "lj".mb_chars.upcase.to_s
# => "LJ"
#
# NOTE: An above example is useful for pre Ruby 2.4. Ruby 2.4 supports Unicode case mappings.
#
# == 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
ActiveSupport::Multibyte.proxy_class.new(self)
end
# Returns +true+ if string has utf_8 encoding.
#
# utf_8_str = "some string".encode "UTF-8"
# iso_str = "some string".encode "ISO-8859-1"
#
# utf_8_str.is_utf8? # => true
# iso_str.is_utf8? # => false
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
end
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