! This tokenizer is based on work by
!  - StandardTokenizerImpl by the Lucene project
!    under the Apache License
!  - https://github.com/dlwh/epic by David Hall (2014)
!    under the Apacahe License
!  - KorAPTokenizerImpl.jflex by Marc Kupietz (2016)
!    under the Apache License
!  - https://github.com/coltekin/TRmorph/tokenize.xfst by Çağrı Çöltekin (2011-2015)
!    under the MIT License

define NLout "@_TOKEN_SYMBOL_@";
! define NLout "\u000a";

define Digit [%0|1|2|3|4|5|6|7|8|9];
define AsciiLetter [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];
define HexLetter [Digit|a|A|b|B|c|C|d|D|e|E|f|F];
define EOT "\u0004";

!!!!!!!!!!!!!!!!!
! <from tmorph> !
!!!!!!!!!!!!!!!!!
define WS [" "|"\u0009"|"\u00a0"|"\u1680"|
           "\u2000"|"\u2001"|"\u2002"|"\u2003"|"\u2004"|"\u2005"| 
           "\u2006"|"\u2007"|"\u2008"|"\u2009"|"\u200a"|
           "\u202f"|"\u205f"|"\u3000"];

define NL ["\u000a"|"\u000b"|"\u000c"|"\u000d"|"\u0085"|"\u2028"|"\u2029"|EOT];

! Punctuation that ends sentences
! Differs!
define SP [["."|"?"|"!"]+|"…"];

! Left punctuation
define LP ["("|"["|"{"|
           "“"|"‘"|"‹"|"«"|
           "'"|%"|
           ! differs
           ["'" "'"] |
           "*"|"/"|"_"| ! Can be Markdown
           ! from book
           [%, %,]];

! Right punctuation - excluding the characters that can be used as apostrophe
define RP [SP|","|";"|":"|
              ")"|"]"|"}"|
              "”"|"›"|"»"|%"|[%’ %’]|["'" "'"]|[%‘ %‘]|
              "*"|"/"|"_"]; ! Can be Markdown

define DQuotes ["”"|%"|"»"|"«"];

define Sym ["-"|"+"|"<"|">"|"*"|"/"|%=|%@|%&];
define Apos %'|%’|%`;
define Punct [LP|RP|Sym];
!define nonSym \[WS|LP|RP|Sym];
!!!!!!!!!!!!!!!!!!
! </from tmorph> !
!!!!!!!!!!!!!!!!!!

define Emdash [%- %- (%-)+ | ["\u2014"|"\u2015"|"\u2e3a"|"\u2e3b"|"\ufe58"]+];
define Dash ["-"|"\u2011"|"\u2012"|"\u2013"|"\u2e1a"|"\ufe63"|"\uff0d"];
define Slash ["⁄"|"∕"|"／"|"/"];
define Asterisk ["*"];

define Char \[WS|NL|Punct|Apos]; ! |¨;

!define Alpha ["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"|"_"];

define SentenceEnd SP NLout [DQuotes (NLout ")") | ["›"|%‹|%’|"'"] ( NLout DQuotes (NLout ")") | NLout ")" ) | ")" ] (NLout SP);

define NotSentenceExtension [? - "”" - %" - "»" - "«" - "›" - %‹ - %’ - "'" - ")" - NLout];