Locale specific index characters

Question

I would like to have an index for a list. For example Android contact list has #,A-Z. But for many locales this doesn't cover all the locale specific characters.

How is the support for this in different programming languages? I took a quick look and in case of core Java I didn't see anything m

Somewhat related: http://cldr.unicode.org/development/development-process/design-proposals/index-characters

Answer 1

This is a VERY good question!

As you note in the language-agnostic tag, the important thing isn’t the programming language. It’s the data set that you really need here. I know of no repository for such things. The ᴄʟᴅʀ data do not yet contain this thing. Here’s a simple table of sequences for various two-letter ɪsᴏ codes, plus a few extras for Asian sequences, written in Perl. This sort of thing could be the basis of a module.

It does require somewhat careful handling, because you can’t blindly titlecase the first grapheme in each element without regard to locale if you want an "uppercase"-ish set. That’s because of the Turkic I problem. I would install methods that pull out the sequences, and detect such things if they asked for something in the Turkic languages.

use utf8;
use strict;
use warnings;

our %Alphabet = (
    en => [qw(a b c d e f g h i j k l m n o p q r s t u v w x y z)],

    br => [qw(a b ch c'h d e f g h i j k l m n o p r s t u v w y z)],
    cy => [qw(a b c ch d dd e f ff g ng h i l ll m n o p ph r rh s t th u w y)],
    ga => [qw(a á b c d e é f g h i í l m n o ó p r s t u ú)],
    gd => [qw(a b c d e f g h i l m n o p r s t u)],

    la => [qw(a b c d e f g h i k l m n o p q r s t v x y z)],
    it => [qw(a b c d e f g h i k l m n o p q r s t u v z)],
    es => [qw(a b c d e f g h i j k l m n ñ o p q r s t u v w x y z)],
    es__traditional =>
          [qw(a b c ch d e f g h i j k l ll m n ñ o p q r s t u v w x y z)],
    eu => [qw(a b c ch d e f g h i j k l ll m n ñ o p q r s t ts tx tz u v w x y z)],
    rm => [qw(a b c d e f g h i j l m n o p q r s t u v x z)],
    ro => [qw(a ă â b c d e f g h i î j k l m n o p q r s ș t ț u v w x y z)],
    oc => [qw(a b c d e f g h i j l m n o p q r s t u v x z)],

    sw => [qw(a b c d e f g h i j k l m n o p q r s t u v w x y z å ä ö)],
    no => [qw(a b c d e f g h i j k l m n o p q r s t u v w x y z æ ø å)],
    is => [qw(a á b d ð e é f g h i í j k l m n o ó p r s t u ú v x y ý þ æ ö)],

    cz => [qw(a á b c č d ď e é ě f g h ch i í j k l m n ň o ó p q r ř s š t ť u ú ů v w x y ý z ž)],
    sk => [qw(a á ä b c č d ď dz dž e é f g h ch i í j k l ĺ ľ m n ň o ó ô p q r ŕ s š t ť u ú v w x y ý z ž)],
    sl => [qw(a b c č d e f g h i j k l m n o p r s š t u v z ž)],

    pl => [qw(a ą b c ć d e ę f g h i j k l ł m n ń o ó p r s ś t u w y z ź ż)],

    lt => [qw(a ą b c č d e ę ė f g h i į y j k l m n o p r s š t u ų ū v z ž)],
    lv => [qw(a ā b c č d e ē f g ģ h i ī j k ķ l ļ m n ņ o p r s š t u ū v z ž)],
    et => [qw(a b d e f g h i j k l m n o p r s š z ž t u v õ ä ö ü)],
    et__full =>
          [qw(A B C D E F G H I J K L M N O P Q R S Š Z Ž T U V W Õ Ä Ö Ü X Y)],
    et__simple => [qw(a b d e g h i j k l m n o p r s t u v õ ä ö ü)],

    hu => [qw(a á b c cS d dz dzs e é f g gy H i í j k l ly M n ny O ó ö ő p q r s sz t ty u ú ü ű v w x y z zs)],
    hu__traditional =>
          [qw(a á b c cs d dz dzs e é f g gy h i í j k l ly m n ny o ó ö ő p r s sz t ty u ú ü ű v z zs)],

    tr => [qw(a b c ç d e f g ğ h ı i j k l m n o ö p r s ş t u ü v y z)],
    az => [qw([a b c ç d e ə f g ğ h x ı i j k q l m n o ö p r s ş t u ü v y z)],
    az_1918_1939 =>
        [qw(a в c ç d e ə f g ƣ h i ь j k q l m n o ɵ p r s ş t u v x y z ƶ)],
    az_1939_1958 =>
        [qw(а б в г ғ д е ё ә ж з и й к қ л м н о ө п р с т у ү ф х h ц ч ҷ ш щ ъ ы ь э ю я ')],
    az_1958_1991 =>
        [qw(а б в г ғ д e ә ж з и ы ј к ҝ л м н о ө п р с т у ү ф х һ ч ҹ ш ')],
    az_1991_1992 =>
        [qw(a ä b c ç d e f g ğ h x ı i j k q l m n o ö p r s ş t u ü v y z)],

    he => [qw(α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ φ χ ψ ω)],

    ru => [qw(а б в г д е ж з и к л м н о п р с т у ф х ц ч ш щ ы э ю я)],
    uk => [qw(а б в г ґ д е є ж з и і ї й к л м н о п р с т у ф х ц ч ш щ ь ю я)],
    mk => [qw(а б в г д ѓ е ж з ѕ и ј / к л љ м н њ о п р с т ќ / у ф х ц ч џ ш)],


    "HIRAGANA AIUEO" =>
         [qw(あ い う え お か き く け こ さ し す せ そ た ち つ て と な に ぬ ね の は ひ ふ へ ほ ま み む め も や ゆ よ ら り る れ ろ わ を ん)],
    "KATAKANA AIUEO" =>
         [qw(ア イ ウ エ オ カ キ ク ケ コ サ シ ス セ ソ タ チ ツ テ ト ナ ニ ヌ ネ ノ ハ ヒ フ ヘ ホ マ ミ ム メ モ ヤ ユ ヨ ラ リ ル レ ロ ワ ヲ ン)],
    "HALFWIDTH KATAKANA AIUEO" =>
        [qw(ｱ ｲ ｳ ｴ ｵ ｶ ｷ ｸ ｹ ｺ ｻ ｼ ｽ ｾ ｿ ﾀ ﾁ ﾂ ﾃ ﾄ ﾅ ﾆ ﾇ ﾈ ﾉ ﾊ ﾋ ﾌ ﾍ ﾎ ﾏ ﾐ ﾑ ﾒ ﾓ ﾔ ﾕ ﾖ ﾗ ﾘ ﾙ ﾚ ﾛ ﾜ ｦ ﾝ)],
    "KATAKANA IROHA" =>
         [qw(イ ロ ハ ニ ホ ヘ ト チ リ ヌ ル ヲ ワ カ ヨ タ レ ソ ツ ネ ナ ラ ム ウ ヰ ノ オ ク ヤ マ ケ フ コ エ テ ア サ キ ユ メ ミ シ ヱ ヒ モ セ ス)],
    "HIRAGANA IROHA" =>
         [qw(い ろ は に ほ へ と ち り ぬ る を わ か よ た れ そ つ ね な ら む う ゐ の お く や ま け ふ こ え て あ さ き ゆ め み し ゑ ひ も せ す)],
    "HALFWIDTH KATAKANA IROHA" =>
        [qw(ｲ ﾛ ﾊ ﾆ ﾎ ﾍ ﾄ ﾁ ﾘ ﾇ ﾙ ｦ ﾜ ｶ ﾖ ﾀ ﾚ ｿ ﾂ ﾈ ﾅ ﾗ ﾑ ｳ ﾉ ｵ ｸ ﾔ ﾏ ｹ ﾌ ｺ ｴ ﾃ ｱ ｻ ｷ ﾕ ﾒ ﾐ ｼ ﾋ ﾓ ｾ ｽ)],

    "HANGUL CHOSUNG" =>
         [qw(ㄱ ㄴ ㄷ ㄹ ㅁ ㅂ ㅅ ㅇ ㅈ ㅊ ㅋ ㅌ ㅍ ㅎ)],
    "HANGUL GANADA" =>
         [qw(가 나 다 라 마 바 사 아 자 차 카 타 파 하)],
    "CHINESE ZODIAC 10" =>
         [qw(甲 乙 丙 丁 戊 己 庚 辛 壬 癸)],
    "CHINESE ZODIAC 12" =>
         [qw(子 丑 寅 卯 辰 巳 午 未 申 酉 戍 亥)],

    "ZODIAC" => [qw(♈ ♉ ♊ ♋  ♌  ♍  ♎  ♏  ♐  ♑  ♒  ♓  )],

);

for my $a (\%Alphabet) {

    $$a{da} = $$a{no};
    $$a{fi} = $$a{no};

    $$a{de} = $$a{en};
    $$a{fr} = $$a{en};
    $$a{pt} = $$a{en};
}


1;

That should certainly be enough to get you started, though.