NAME¶
HTML::Entities - Encode or decode strings with HTML entities
SYNOPSIS¶
use HTML::Entities;
$a = "Våre norske tegn bør æres";
decode_entities($a);
encode_entities($a, "\200-\377");
For example, this:
$input = "vis-a-vis Beyonce's naieve\npapier-mache resume";
print encode_entities($input), "\n"
Prints this out:
vis-à-vis Beyoncé's naïve
papier-mâché résumé
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. 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, $expand_prefix
)
- 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 expanded unless
their value overflow.
The keys in %entity2char are the entity names to be expanded and their
values are what they should expand into. The values do not have to be
single character strings. If a key has ";" as suffix, then
occurrences in $string are only expanded if properly terminated with
";". Entities without ";" will be expanded regardless
of how they are terminated for compatibility with how common browsers
treat entities in the Latin-1 range.
If $expand_prefix is TRUE then entities without trailing ";" in
%entity2char will even be expanded as a prefix of a longer unrecognized
name. The longest matching name in %entity2char will be used. This is
mainly present for compatibility with an MSIE misfeature.
$string = "foo bar";
_decode_entities($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. The unsafe characters is specified
using the regular expression character class syntax (what you find within
brackets in regular expressions).
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:
$encoded = encode_entities($input, '<>&"');
and this would only encode non-plain ascii:
$encoded = encode_entities($input, '^\n\x20-\x25\x27-\x7e');
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 "&#x hexnum;" and
never "& entname;". For example,
"encode_entities("r\xF4le")" returns
"rôle", but
"encode_entities_numeric("r\xF4le")" returns
"rôle".
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 1995-2006 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.