HTML::Entities - Encode or decode strings with HTML entities

- NAME
- SYNOPSIS
- DESCRIPTION
- COPYRIGHT

# NAME

HTML::Entities - Encode or decode strings with HTML entities

# SYNOPSIS

     use HTML::Entities;

     $a = "V&aring;re norske tegn b&oslash;r &#230res";
     decode_entities($a);
     encode_entities($a, "\200-\377");

For example, this:

     $input = "vis-à-vis Beyoncé's naïve\npapier-mâché résumé";
     print encode_entities($in), "\n"

Prints this out:

     vis-&agrave;-vis Beyonc&eacute;'s na&iuml;ve
     papier-m&acirc;ch&eacute; r&eacute;sum&eacute;

# DESCRIPTION

This module deals with encoding and decoding of strings with HTML character entities. The module provides the following functions:

decode_entities( $string, ... )
  This routine replaces HTML entities found in the $string with the corresponding Unicode character. Under perl 5.6 and earlier only characters in the Latin-1 range are replaced. Unrecognized entities are left alone.

  If multiple strings are provided as argument they are each decoded separately and the same number of strings are returned.

  If called in void context the arguments are decoded in-place.

  This routine is exported by default.

_decode_entities( $string, \%entity2char )
_decode_entities( $string, \%entity2char, $allow_unterminated )
  This will in-place replace HTML entities in $string. The %entity2char hash must be provided. Named entities not found in the %entity2char hash are left alone. Numeric entities are always expanded.

  If $allow_unterminated is TRUE then we also unterminated named entities will also be expanded. The longest matching name in %entity2char will be used.

         $string = "foo&nbspbar";
         _decode_entities($string, { nb => "@", nbsp => "\xA0" }, 1);
         print $string;  # will print "foo bar"

  This routine is exported by default.

encode_entities( $string )
encode_entities( $string, $unsafe_chars )
  This routine replaces unsafe characters in $string with their entity representation. A second argument can be given to specify which characters to consider unsafe (i.e., which to escape). The default set of characters to encode are control chars, high-bit chars, and the `<`, `&`, `>`, and `"` characters. But this, for example, would encode just the `<`, `&`, `>`, and `"` characters:

        $escaped = encode_entities($input, '<>&"');

  This routine is exported by default.

encode_entities_numeric( $string )
encode_entities_numeric( $string, $unsafe_chars )
  This routine works just like encode_entities, except that the replacement entities are always `&#xhexnum;` and never `&entname;`. For example, `escape_entities("r\xF4le")` returns ``r&ocirc;le'', but `escape_entities_numeric("r\xF4le")` returns ``r&#xF4;le''.

  This routine is not exported by default. But you can always export it with `use HTML::Entities qw(encode_entities_numeric);` or even `use HTML::Entities qw(:DEFAULT encode_entities_numeric);`

All these routines modify the string passed as the first argument, if called in a void context. In scalar and array contexts, the encoded or decoded string is returned (without changing the input string).

If you prefer not to import these routines into your namespace, you can call them as:

      use HTML::Entities ();
      $decoded = HTML::Entities::decode($a);
      $encoded = HTML::Entities::encode($a);
      $encoded = HTML::Entities::encode_numeric($a);

The module can also export the %char2entity and the %entity2char hashes, which contain the mapping from all characters to the corresponding entities (and vice versa, respectively).

# COPYRIGHT

Copyright 1995-2004 Gisle Aas. All rights reserved.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

HTML::Entities - Encode or decode strings with HTML entities