vendor/rails/activesupport/lib/active_support/core_ext/string/iterators.rb

   1 require 'strscan'
   2
   3 module ActiveSupport #:nodoc:
   4   module CoreExtensions #:nodoc:
   5     module String #:nodoc:
   6       # Custom string iterators
   7       module Iterators
   8         def self.append_features(base)
   9           super unless '1.9'.respond_to?(:each_char)
  10         end
  11
  12         # Yields a single-character string for each character in the string.
  13         # When $KCODE = 'UTF8', multi-byte characters are yielded appropriately.
  14         def each_char
  15           scanner, char = StringScanner.new(self), /./mu
  16           loop { yield(scanner.scan(char) || break) }
  17         end
  18       end
  19     end
  20   end
  21 end