diff options
Diffstat (limited to 'activesupport')
| -rw-r--r-- | activesupport/lib/active_support/core_ext/string/conversions.rb | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/activesupport/lib/active_support/core_ext/string/conversions.rb b/activesupport/lib/active_support/core_ext/string/conversions.rb index d70f5d7241..4cc36147f8 100644 --- a/activesupport/lib/active_support/core_ext/string/conversions.rb +++ b/activesupport/lib/active_support/core_ext/string/conversions.rb @@ -3,11 +3,27 @@ require 'active_support/core_ext/time/publicize_conversion_methods' require 'active_support/core_ext/time/calculations' class String - # Returns the ASCII code of the first character of the string, assuming it belongs to ASCII. + # Returns the codepoint of the first character of the string, assuming a + # single-byte character encoding: # - # This method is defined for Ruby 1.9 forward compatibility on ASCII characters. + # "a".ord # => 97 + # "à".ord # => 224, in ISO-8859-1 # - # See also <tt>ActiveSupport::Multibyte::Chars#ord</tt>. + # This method is defined in Ruby 1.8 for Ruby 1.9 forward compatibility on + # these character encodings. + # + # <tt>ActiveSupport::Multibyte::Chars#ord</tt> is forward compatible with + # Ruby 1.9 on UTF8 strings: + # + # "a".mb_chars.ord # => 97 + # "à".mb_chars.ord # => 224, in UTF8 + # + # Note that the 224 is different in both examples. In ISO-8859-1 "à" is + # represented as a single byte, 224. In UTF8 it is represented with two + # bytes, namely 195 and 160, but its Unicode codepoint is 224. If we + # call +ord+ on the UTF8 string "à" the return value will be 195. That is + # not an error, because UTF8 is unsupported, the call itself would be + # bogus. def ord self[0] end unless method_defined?(:ord) |