#
# Copyright (C) 2016 and later: Unicode, Inc. and others.
# License & terms of use: http://www.unicode.org/copyright.html
# Copyright (C) 2002-2016, International Business Machines Corporation
# and others. All Rights Reserved.
#
# file: word_POSIX.txt
#
# ICU Word Break Rules, POSIX locale.
# See Unicode Standard Annex #29.
# These rules are based on UAX #29 Revision 29 for Unicode Version 9.0
# with additions for Emoji Sequences from https://goo.gl/cluFCn
# Plus additional characters introduces with Emoji 5, http://www.unicode.org/reports/tr51/proposed.html
#
# Note: Updates to word.txt will usually need to be merged into
# word_POSIX.txt also.
##############################################################################
#
# Character class definitions from TR 29
#
##############################################################################
!!chain;
!!quoted_literals_only;
#
# Character Class Definitions.
#
$CR = [\p{Word_Break = CR}];
$LF = [\p{Word_Break = LF}];
$Newline = [\p{Word_Break = Newline} ];
$Extend = [\p{Word_Break = Extend}];
$ZWJ = [\p{Word_Break = ZWJ}];
$Regional_Indicator = [\p{Word_Break = Regional_Indicator}];
$Format = [\p{Word_Break = Format}];
$Katakana = [\p{Word_Break = Katakana}];
$Hebrew_Letter = [\p{Word_Break = Hebrew_Letter}];
$ALetter = [\p{Word_Break = ALetter}];
$Single_Quote = [\p{Word_Break = Single_Quote}];
$Double_Quote = [\p{Word_Break = Double_Quote}];
$MidNumLet = [\p{Word_Break = MidNumLet} - [.]];
$MidLetter = [\p{Word_Break = MidLetter} - [\:]];
$MidNum = [\p{Word_Break = MidNum} [.]];
$Numeric = [\p{Word_Break = Numeric}];
$ExtendNumLet = [\p{Word_Break = ExtendNumLet}];
$WSegSpace = [\p{Word_Break = WSegSpace}];
$Extended_Pict = [:ExtPict:];
$Han = [:Han:];
$Hiragana = [:Hiragana:];
# Dictionary character set, for triggering language-based break engines. Currently
# limited to LineBreak=Complex_Context. Note that this set only works in Unicode
# 5.0 or later as the definition of Complex_Context was corrected to include all
# characters requiring dictionary break.
$Control = [\p{Grapheme_Cluster_Break = Control}];
$HangulSyllable = [\uac00-\ud7a3];
$ComplexContext = [:LineBreak = Complex_Context:];
$KanaKanji = [$Han $Hiragana $Katakana];
$dictionaryCJK = [$KanaKanji $HangulSyllable];
$dictionary = [$ComplexContext $dictionaryCJK];
# leave CJK scripts out of ALetterPlus
$ALetterPlus = [$ALetter-$dictionaryCJK [$ComplexContext-$Extend-$Control]];
#
# Rules 4 Ignore Format and Extend characters,
# except when they appear at the beginning of a region of text.
#
# TODO: check if handling of katakana in dictionary makes rules incorrect/void
$KatakanaEx = $Katakana ($Extend | $Format | $ZWJ)*;
$Hebrew_LetterEx = $Hebrew_Letter ($Extend | $Format | $ZWJ)*;
$ALetterEx = $ALetterPlus ($Extend | $Format | $ZWJ)*;
$Single_QuoteEx = $Single_Quote ($Extend | $Format | $ZWJ)*;
$Double_QuoteEx = $Double_Quote ($Extend | $Format | $ZWJ)*;
$MidNumLetEx = $MidNumLet ($Extend | $Format | $ZWJ)*;
$MidLetterEx = $MidLetter ($Extend | $Format | $ZWJ)*;
$MidNumEx = $MidNum ($Extend | $Format | $ZWJ)*;
$NumericEx = $Numeric ($Extend | $Format | $ZWJ)*;
$ExtendNumLetEx = $ExtendNumLet ($Extend | $Format | $ZWJ)*;
$Regional_IndicatorEx = $Regional_Indicator ($Extend | $Format | $ZWJ)*;
$Ideographic = [\p{Ideographic}];
$HiraganaEx = $Hiragana ($Extend | $Format | $ZWJ)*;
$IdeographicEx = $Ideographic ($Extend | $Format | $ZWJ)*;
## -------------------------------------------------
# Rule 3 - CR x LF
#
$CR $LF;
# Rule 3c ZWJ x (Extended_Pict | EmojiNRK). Precedes WB4, so no intervening Extend chars allowed.
#
$ZWJ $Extended_Pict;
# Rule 3d - Keep horizontal whitespace together.
#
$WSegSpace $WSegSpace;
# Rule 4 - ignore Format and Extend characters, except when they appear at the beginning
# of a region of Text. The rule here comes into play when the start of text
# begins with a group of Format chars, or with a "word" consisting of a single
# char that is not in any of the listed word break categories followed by
# format char(s), or is not a CJK dictionary character.
[^$CR $LF $Newline]? ($Extend | $Format | $ZWJ)+;
$NumericEx {100};
$ALetterEx {200};
$HangulSyllable {200};
$Hebrew_LetterEx{200};
$KatakanaEx {400}; # note: these status values override those from rule 5
$HiraganaEx {400}; # by virtue of being numerically larger.
$IdeographicEx {400}; #
$Extended_Pict ($Extend | $Format | $ZWJ)*;
#
# rule 5
# Do not break between most letters.
#
($ALetterEx | $Hebrew_LetterEx) ($ALetterEx | $Hebrew_LetterEx) {200};
# rule 6 and 7
($ALetterEx | $Hebrew_LetterEx) ($MidLetterEx | $MidNumLetEx | $Single_QuoteEx) ($ALetterEx | $Hebrew_LetterEx) {200};
# rule 7a
$Hebrew_LetterEx $Single_QuoteEx {200};
# rule 7b and 7c
$Hebrew_LetterEx $Double_QuoteEx $Hebrew_LetterEx {200};
# rule 8
$NumericEx $NumericEx {100};
# rule 9
($ALetterEx | $Hebrew_LetterEx) $NumericEx {200};
# rule 10
$NumericEx ($ALetterEx | $Hebrew_LetterEx) {200};
# rule 11 and 12
$NumericEx ($MidNumEx | $MidNumLetEx | $Single_QuoteEx) $NumericEx {100};
# rule 13
# to be consistent with $KanaKanji $KanaKanhi, changed
# from 300 to 400.
# See also TestRuleStatus in intltest/rbbiapts.cpp
$KatakanaEx $KatakanaEx {400};
# rule 13a/b
$ALetterEx $ExtendNumLetEx {200}; # (13a)
$Hebrew_LetterEx $ExtendNumLetEx {200}; # (13a)
$NumericEx $ExtendNumLetEx {100}; # (13a)
$KatakanaEx $ExtendNumLetEx {400}; # (13a)
$ExtendNumLetEx $ExtendNumLetEx {200}; # (13a)
$ExtendNumLetEx $ALetterEx {200}; # (13b)
$ExtendNumLetEx $Hebrew_Letter {200}; # (13b)
$ExtendNumLetEx $NumericEx {100}; # (13b)
$ExtendNumLetEx $KatakanaEx {400}; # (13b)
# rules 15 - 17
# Pairs of Regional Indicators stay together.
# With rule chaining disabled by ^, this rule will match exactly two of them.
# No other rule begins with a Regional_Indicator, so chaining cannot extend the match.
#
^$Regional_IndicatorEx $Regional_IndicatorEx;
# special handling for CJK characters: chain for later dictionary segmentation
$HangulSyllable $HangulSyllable {200};
$KanaKanji $KanaKanji {400}; # different rule status if both kana and kanji found
# Rule 999
# Match a single code point if no other rule applies.
.;