Yuto KAWAMURA
and 1 contributors

NAME

Lingua::JA::Dakuon - Convert between dakuon/handakuon and seion for Japanese

SYNOPSIS

    use utf8;
    use Lingua::JA::Dakuon ':all';

    # Convert char to dakuon/handakuon
    dakuon('か');    #=> 'が'(\x{304c})
    dakuon('タ');     #=> 'ダ'(\x{ff80}\x{ff9e})
    dakuon('あ');    #=> 'あ'(\x{3042})
    handakuon('は'); #=> 'ぱ'(\x{3071})
    {
        local $Lingua::JA::Dakuon::EnableCombining = 1;
        dakuon('あ'); #=> "\x{3042}\x{3099}"
    }
    {
        local $Lingua::JA::Dakuon::PreferCombining = 1;
        dakuon('か');    #=> "\x{304b}\x{3099}"
        handakuon('は'); #=> "\x{306f}\x{309a}"
    }

    # Convert char to seion
    seion('が');         #=> 'か'(\x{304b})
    seion('か゛');       #=> 'か'(\x{304b})
    seion('あ');         #=> 'あ'(\x{3042})
    seion("あ\x{3099}"); #=> 'あ'(\x{3042})
    seion('ダ');         #=> 'タ' (\x{ff80})
    seion('ぱ');         #=> 'は'(\x{306f})
    seion('は゜');       #=> 'は'(\x{306f})
    seion('タ゚');         #=> 'タ' (\x{ff80})

    # Normalize dakuon/handakuon expression in string
    dakuon_normalize("あがさ\x{3099}た゛なぱま\x{3099}ゔハビフ\x{3099}");
        #=> 'あがざだなぱまゔハビブ'
    handakuon_normalize("あぱひ\x{309a}ひ゜がま\x{309a}ハピフ\x{309a}");
        #=> 'あぱぴぴがまハピプ'
    {
        local $Lingua::JA::Dakuon::PreferCombining = 1;
        dakuon_normalize("あがさ\x{3099}た゛なぱま\x{3099}ゔハビフ\x{3099}");
           #=> "あか\x{3099}さ\x{3099}た\x{3099}なぱま\x{3099}う\x{3099}ハビブ"
        handakuon_normalize("あぱひ\x{309a}ひ゜がま\x{309a}ハピフ\x{309a}");
           #=> "あは\x{309a}ひ\x{309a}ひ\x{309a}がま\x{309a}ハピプ"
    }

    all_dakuon_normalize($string);
        #=> equivalent to dakuon_normalize(handakuon_normalize($string));

DESCRIPTION

This module provide routines to handle dakuon/handakuon in Japanese which is expressed by Unicode.

VARIABLES

$Lingua::JA::Dakuon::EnableCombining (default: 0)

If this variable set to true, use unicode combining character if needed. For example, there is no code corresponding to dakuon for 'あ'(\x{3042}). But it can be forcely expressed with combining character "\x{3099}" as "\x{3042}\x{3099}" if this flag was enabled.

$Lingua::JA::Dakuon::PreferCombining (default: 0)

If this variable set to true, use combining character instead of dakuon character code even if it is avaiable. For example, calling dakuon() with argument 'か' will return "か\x{3099}" instead of returning "\x{304c}".

$Lingua::JA::Dakuon::AllDakuonRE

Regex *STRING*(not compiled) that matches all dakuon character(s) can be passed to seion().

$Lingua::JA::Dakuon::AllHandakuonRE

Regex *STRING*(not compiled) that matches all handakuon character(s) can be passed to seion().

FUNCTIONS

dakuon($char)

Convert passed character to dakuon character if it is possible. Return undef if passed argument has more than 1 character.

    dakuon('か');   #=> 'が'(\x{304c})

handakuon($char)

Convert passed character to handakuon character if it is possible. Return undef if passed argument has more than 1 character.

    handakuon('は'); #=> 'ぱ'(\x{3071})

seion($char)

Convert passed character to seion character if it is possible. Return undef if passed argument has more than 2 character or second character isn't a mark charactor which expresses dakuon/handakuon.

    seion('が'); #=> 'か'(\x{304b})
    seion('ぱ'); #=> 'は'(\x{306f})

dakuon_normalize($string)

Normalize string that maybe contains multiple expression of dakuon.

    dakuon_normalize("あがさ\x{3099}た゛なぱま\x{3099}ゔハビフ\x{3099}");
        #=> 'あがざだなぱまゔハビブ'

handakuon_normalize($string)

Normalize string that maybe contains multiple expression of handakuon.

    handakuon_normalize("あぱひ\x{309a}ひ゜がま\x{309a}ハピフ\x{309a}");
        #=> 'あぱぴぴがまハピプ'

all_dakuon_normalize($string)

Equivalent to calling dakuon_normalize(handakuon_normalize($string));

SEE ALSO

濁点 - Wikipedia
半濁点 - Wikipedia
清音 - Wikipedia

LICENSE

Copyright (C) Yuto KAWAMURA(kawamuray).

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

AUTHOR

Yuto KAWAMURA(kawamuray) <kawamuray.dadada@gmail.com>