/ 
Unicode-UTF8-0.54
River stage three • 58 direct dependents • 150 total dependents
/ Unicode::UTF8

NAME

Unicode::UTF8 - Encoding and decoding of UTF-8 encoding form

SYNOPSIS

use Unicode::UTF8 qw[decode_utf8 encode_utf8];

$string = decode_utf8($octets);
$octets = encode_utf8($string);

DESCRIPTION

This module provides functions to encode and decode UTF-8 encoding form as specified by Unicode and ISO/IEC 10646:2011.

FUNCTIONS

decode_utf8

$string = decode_utf8($octets);
$string = decode_utf8($octets, $fallback);

Returns an decoded representation of $octets in UTF-8 encoding as a character string.

Issues a warning using warnings category utf8 if $octets contains ill-formed UTF-8 sequences or encoded code points which can't be interchanged.

$fallback is an optional CODE reference which provides a error-handling mechanism, allowing customization of error handling. The default error-handling mechanism is to replace any ill-formed UTF-8 sequences or encoded code points which can't be interchanged with REPLACEMENT CHARACTER (U+FFFD).

$string = $fallback->($octets, $is_usv);

$fallback is invoked with two arguments, $octets and $is_usv. $octets is a sequence of one or more octets containing the maximal subpart of the ill-formed subsequence or encoded code point which can't be interchanged. $is_usv is a boolean indicating whether or not $octets represent a encoded Unicode scalar value. $fallback must return a character string consisting of zero or more Unicode scalar values. Unicode scalar values consist of code points in the range U+0000..U+D7FF and U+E000..U+10FFFF.

encode_utf8

$octets = encode_utf8($string);
$octets = encode_utf8($string, $fallback);

Returns an encoded representation of $string in UTF-8 encoding as an octet string.

Issues a warning using warnings category utf8 if $string contains code points which can't be interchanged or represented in UTF-8 encoding form.

$fallback is an optional CODE reference which provides a error-handling mechanism, allowing customization of error handling. The default error-handling mechanism is to replace any code points which can't be interchanged or represented in UTF-8 encoding form with REPLACEMENT CHARACTER (U+FFFD).

$string = $fallback->($codepoint, $is_usv);

$fallback is invoked with two arguments, $codepoint and $is_usv. $codepoint is a unsigned integer containing the code point which can't be interchanged or represented in UTF-8 encoding form. $is_usv is a boolean indicating whether or not $codepoint is a Unicode scalar value. $fallback must return a character string consisting of zero or more Unicode scalar values. Unicode scalar values consist of code points in the range U+0000..U+D7FF and U+E000..U+10FFFF.

EXPORTS

None by default. All functions can be exported using the :all tag or individually.

DIAGNOSTICS

Can't decode a wide character string

(F) Wide character in octets.

Can't decode ill-formed UTF-8 octet sequence <%s> in position %u

(W utf8) Encountered an ill-formed UTF-8 octet sequence. <%s> contains a hexadecimal representation of the maximal subpart of the ill-formed subsequence.

Can't interchange noncharacter code point U+%.4X at position %u

(W utf8, nonchar) Noncharacters is permanently reserved for internal use and that should never be interchanged. Noncharacters consist of the values U+nFFFE and U+nFFFF (where n is from 0 to 10^16) and the values U+FDD0..U+FDEF.

Can't represent surrogate code point U+%.4X at position %u in UTF-8 encoding form

(W utf8, surrogate) Surrogate code points are designated only for surrogate code units in the UTF-16 character encoding form. Surrogates consist of code points in the range U+D800 to U+DFFF.

Can't represent super code point \x{%X} at position %u in UTF-8 encoding form

(W utf8, non_unicode) Code points greater than U+10FFFF. Perl's extended codespace.

Can't decode ill-formed UTF-X octet sequence <%s> in position %u

(F) Encountered an ill-formed octet sequence in Perl's internal representation of wide characters.

Please note that the sub-categories of utf8 warning nonchar, surrogate and non_unicode is only available on Perl 5.14 or greater. See perllexwarn for available categories and hierarchies.

COMPARISON

Here is a summary of features for comparison with Encode's UTF-8 implementation:

  • simple API which makes use of Perl's standard warning categories.

  • recognizes all noncharacters regardless of perl version

  • implements Unicode's recommended practice for using U+FFFD

  • good diagnostics in warnings messages

  • detects and reports inconsistency in perl's internal encoding (UTF-X)

  • preserves taintedness of decoded $octets or encoded $string

  • better performance ~ 600% - 1200% (JA: 600%, AR: 700%, SV: 900%, EN: 1200%, see benchmarks directory in git repository)

CONFORMANCE

It's the author's believe that this UTF-8 implementation is conformant with the Unicode Standard Version 6.0. Any deviations from the Unicode Standard is to be considered a bug.

SEE ALSO

Encode
http://www.unicode.org/

SUPPORT

BUGS

Please report any bugs by email to bug-unicode-utf8 at rt.cpan.org, or through the web interface at http://rt.cpan.org/Public/Dist/Display.html?Name=Unicode-UTF8. You will be automatically notified of any progress on the request by the system.

SOURCE CODE

This is open source software. The code repository is available for public review and contribution under the terms of the license.

http://github.com/chansen/p5-unicode-utf8

git clone http://github.com/chansen/p5-unicode-utf8

AUTHOR

Christian Hansen chansen@cpan.org

COPYRIGHT

Copyright 2011 by Christian Hansen.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.