ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.12/lib/active_support/core_ext/string/starts_ends_with.rb

   1 module ActiveSupport #:nodoc:
   2   module CoreExtensions #:nodoc:
   3     module String #:nodoc:
   4       # Additional string tests.
   5       module StartsEndsWith
   6         def self.append_features(base)
   7           if '1.8.7 and up'.respond_to?(:start_with?)
   8             base.class_eval do
   9               alias_method :starts_with?, :start_with?
  10               alias_method :ends_with?, :end_with?
  11             end
  12           else
  13             super
  14             base.class_eval do
  15               alias_method :start_with?, :starts_with?
  16               alias_method :end_with?, :ends_with?
  17             end
  18           end
  19         end
  20
  21         # Does the string start with the specified +prefix+?
  22         def starts_with?(prefix)
  23           prefix.respond_to?(:to_str) && self[0, prefix.length] == prefix
  24         end
  25
  26         # Does the string end with the specified +suffix+?
  27         def ends_with?(suffix)
  28           suffix.respond_to?(:to_str) && self[-suffix.length, suffix.length] == suffix
  29         end
  30       end
  31     end
  32   end
  33 end