NAME
Unicode::Collate::Locale - Linguistic tailoring for DUCET via Unicode::Collate
SYNOPSIS
use Unicode::Collate::Locale;
#construct
$Collator = Unicode::Collate::Locale->
new(locale => $locale_name, %tailoring);
#sort
@sorted = $Collator->sort(@not_sorted);
#compare
$result = $Collator->cmp($a, $b); # returns 1, 0, or -1.Note: Strings in @not_sorted, $a and $b are interpreted according to Perl's Unicode support. See perlunicode, perluniintro, perlunitut, perlunifaq, utf8. Otherwise you can use preprocess (cf. Unicode::Collate) or should decode them before.
DESCRIPTION
This module provides linguistic tailoring for it taking advantage of Unicode::Collate.
Constructor
The new method returns a collator object.
A parameter list for the constructor is a hash, which can include a special key locale and its value (case-insensitive) standing for a two-letter language code (ISO-639) like 'en' for English. For example, Unicode::Collate::Locale->new(locale => 'FR') returns a collator tailored for French.
$locale_name may be suffixed with a territory(country) code or a variant code, which are separated with '_'. E.g. en_US for English in USA, es_ES_traditional for Spanish in Spain (Traditional),
If $localename is not defined, fallback is selected in the following order:
1. language_territory_variant
2. language_territory
3. language__variant
4. language
5. defaultTailoring tags provided by Unicode::Collate are allowed as long as they are not used for locale support. Esp. the table tag is always untailorable since it is reserved for DUCET.
E.g. a collator for French, which ignores diacritics and case difference (i.e. level 1), with reversed case ordering and no normalization.
Unicode::Collate::Locale->new(
level => 1,
locale => 'fr',
upper_before_lower => 1,
normalization => undef
)Overriding a behavior already tailored by locale is disallowed if such a tailoring is passed to new().
Unicode::Collate::Locale->new(
locale => 'da',
upper_before_lower => 0, # causes error as reserved by 'da'
)However change() inherited from Unicode::Collate allows such a tailoring that is reserved by locale. Examples:
new(locale => 'ca')->change(backwards => undef)
new(locale => 'da')->change(upper_before_lower => 0)
new(locale => 'ja')->change(overrideCJK => undef)Methods
Unicode::Collate::Locale is a subclass of Unicode::Collate and methods other than new are inherited from Unicode::Collate.
Here is a list of additional methods:
$Collator->getlocale-
Returns a language code accepted and used actually on collation. If linguistic tailoring is not provided for a language code you passed (intensionally for some languages, or due to the incomplete implementation), this method returns a string
'default'meaning no special tailoring.
A list of tailorable locales
locale name description
----------------------------------------------------------
af Afrikaans
ar Arabic
az Azerbaijani (Azeri)
be Belarusian
bg Bulgarian
ca Catalan
cs Czech
cy Welsh
da Danish
de__phonebook German (umlaut as 'ae', 'oe', 'ue')
eo Esperanto
es Spanish
es__traditional Spanish ('ch' and 'll' as a grapheme)
et Estonian
fi Finnish
fil Filipino
fo Faroese
fr French
ha Hausa
haw Hawaiian
hr Croatian
hu Hungarian
hy Armenian
ig Igbo
is Icelandic
ja Japanese [1]
kk Kazakh
kl Kalaallisut
ko Korean [2]
lt Lithuanian
lv Latvian
mk Macedonian
mt Maltese
nb Norwegian Bokmal
nn Norwegian Nynorsk
nso Northern Sotho
om Oromo
pl Polish
ro Romanian
ru Russian
se Northern Sami
sk Slovak
sl Slovenian
sq Albanian
sr Serbian
sv Swedish
tn Tswana
to Tonga
tr Turkish
uk Ukrainian
vi Vietnamese
wo Wolof
yo Yoruba
zh Chinese
zh__big5han Chinese (ideographs: big5 order)
zh__gb2312han Chinese (ideographs: GB-2312 order)
zh__pinyin Chinese (ideographs: pinyin order)
zh__stroke Chinese (ideographs: stroke order)
----------------------------------------------------------Locales according to the default UCA rules include de (German), en (English), ga (Irish), id (Indonesian), it (Italian), ka (Georgian), ln (Lingala), ms (Malay), nl (Dutch), pt (Portuguese), st (Southern Sotho), sw (Swahili), xh (Xhosa), zu (Zulu).
Note
[1] ja: Ideographs are sorted in JIS X 0208 order. Fullwidth and halfwidth forms are identical to their normal form. The difference between hiragana and katakana is at the 4th level, the comparison also requires (variable => 'Non-ignorable'), and then katakana_before_hiragana has no effect.
[2] ko: Plenty of ideographs are sorted by their reading. Such an ideograph is primary (level 1) equal to, and secondary (level 2) greater than, the corresponding hangul syllable.
INSTALL
Installation of Unicode::Collate::Locale requires Collate/Locale.pm, Collate/Locale/*.pm, Collate/CJK/*.pm and Collate/allkeys.txt. On building, Unicode::Collate::Locale doesn't require any of data/*.txt, gendata/*, and mklocale. Tests for Unicode::Collate::Locale are named t/loc_*.t.
CAVEAT
- tailoring is not maximum
-
Even if a certain letter is tailored, its equivalent would not always tailored as well as it. For example, even though W is tailored, fullwidth W (
U+FF37), W with acute (U+1E82), etc. are not tailored. The result may depend on whether source strings are normalized or not, and whether decomposed or composed. Thus(normalization => undef)is less preferred.
AUTHOR
The Unicode::Collate::Locale module for perl was written by SADAHIRO Tomoyuki, <SADAHIRO@cpan.org>. This module is Copyright(C) 2004-2011, SADAHIRO Tomoyuki. Japan. All rights reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
- Unicode Collation Algorithm - UTS #10
- The Default Unicode Collation Element Table (DUCET)
- Unicode Locale Data Markup Language (LDML) - UTS #35
- CLDR - Unicode Common Locale Data Repository
- Unicode::Collate
- Unicode::Normalize