HTML entity encoding and decoding for Ruby
HTMLEntities is a simple library to facilitate encoding and decoding of named
ý and so on) or numerical (
Ī) entities in HTML
and XHTML documents.
HTMLEntities works with UTF-8 (or ASCII) strings only.
Please ensure that your system is set to display UTF-8 before running these
examples. In Ruby 1.8, you'll need to set
$KCODE = "u".
require 'htmlentities' coder = HTMLEntities.new string = "élan" coder.decode(string) # => "élan"
This is slightly more complicated, due to the various options. The encode method takes a variable number of parameters, which tell it which instructions to carry out.
require 'htmlentities' coder = HTMLEntities.new string = "<élan>"
Escape unsafe codepoints only:
coder.encode(string) # => "<élan>"
coder.encode(string, :basic) # => "<élan>"
Escape all entities that have names:
coder.encode(string, :named) # => "<élan>"
Escape all non-ASCII/non-safe codepoints using decimal entities:
coder.encode(string, :decimal) # => "<élan>"
As above, using hexadecimal entities:
coder.encode(string, :hexadecimal) # => "<élan>"
You can also use several options, e.g. use named entities for unsafe codepoints, then decimal for all other non-ASCII:
coder.encode(string, :basic, :decimal) # => "<élan>"
HTMLEntities knows about three different sets of entities:
:xhtml1– Entities from the XHTML1 doctype
:html4– Entities from the HTML4 doctype. Differs from +xhtml1+ only by the absence of +&apos+
:expanded– Entities from a variety of SGML sets
The default is
:xhtml, but you can override this:
coder = HTMLEntities.new(:expanded)
This code is free to use under the terms of the MIT licence:
Copyright (c) 2005-2009 Paul Battley
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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