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1# Copyright (C) 2016 and later: Unicode, Inc. and others.
2# License & terms of use: http://www.unicode.org/copyright.html
3# Copyright (c) 2002-2016  International Business Machines Corporation and
4# others. All Rights Reserved.
5#
6#  file:  line_loose_cj.txt
7#
8#         Line Breaking Rules
9#         Implement default line breaking as defined by
10#         Unicode Standard Annex #14 Revision 44 for Unicode 13.0
11#         http://www.unicode.org/reports/tr14/, with the following modification:
12#
13#         Boundaries between hyphens and following letters are suppressed when
14#         there is a boundary preceding the hyphen. See rule 20.9
15#
16#         This tailors the line break behavior to correspond to CSS
17#         line-break=loose (BCP47 -u-lb-loose) as defined for Chinese & Japanese.
18#         It sets characters of class CJ to behave like ID.
19#         In addition, it allows breaks:
20#         * before hyphens 2010 & 2013 (both BA) and 301C, 30A0 (both NS)
21#         * before iteration marks 3005, 303B, 309D, 309E, 30FD, 30FE (all NS)
22#         * between characters of LineBreak class IN such as 2026
23#         * before some centered punct 203C, 2047, 2048, 2049, 30FB, FF1A, FF1B,
24#           FF65 (all NS) and FF01, FF1F (both EX).
25#         * before suffix characters with LineBreak class PO and EastAsianWidth A,F,W;
26#           this includes: 00B0 2030 2032 2033 2035 2103 2109 FE6A FF05 FFE0
27#         * after prefix characters with LineBreak class PR and EastAsianWidth A,F,W;
28#           this includes: 00A4 00B1 20AC 2116 FE69 FF04 FFE1 FFE5 FFE6
29#         It allows breaking before 201C and after 201D, for zh_Hans, zh_Hant, and ja.
30
31
32#
33#  Character Classes defined by TR 14.
34#
35
36!!chain;
37!!quoted_literals_only;
38
39$AI = [:LineBreak =  Ambiguous:];
40$AL = [:LineBreak =  Alphabetic:];
41$BAX = [\u2010 \u2013];
42$BA = [[:LineBreak =  Break_After:] - $BAX];
43$HH = [\u2010];     # \u2010 is HYPHEN, default line break is BA.
44$BB = [:LineBreak =  Break_Before:];
45$BK = [:LineBreak =  Mandatory_Break:];
46$B2 = [:LineBreak =  Break_Both:];
47$CB = [:LineBreak =  Contingent_Break:];
48$CJ = [:LineBreak =  Conditional_Japanese_Starter:];
49$CL = [[:LineBreak =  Close_Punctuation:] \u201d];
50# $CM = [:LineBreak =  Combining_Mark:];
51$CP = [:LineBreak =  Close_Parenthesis:];
52$CR = [:LineBreak =  Carriage_Return:];
53$EB = [:LineBreak =  EB:];
54$EM = [:LineBreak =  EM:];
55$EXX = [\uFF01 \uFF1F];
56$EX = [[:LineBreak =  Exclamation:] - $EXX];
57$GL = [:LineBreak =  Glue:];
58$HL = [:LineBreak =  Hebrew_Letter:];
59$HY = [:LineBreak =  Hyphen:];
60$H2 = [:LineBreak =  H2:];
61$H3 = [:LineBreak =  H3:];
62# CSS Loose tailoring: CJ resolves to ID
63$ID = [[:LineBreak =  Ideographic:] $CJ];
64$IN = [:LineBreak =  Inseperable:];
65$IS = [:LineBreak =  Infix_Numeric:];
66$JL = [:LineBreak =  JL:];
67$JV = [:LineBreak =  JV:];
68$JT = [:LineBreak =  JT:];
69$LF = [:LineBreak =  Line_Feed:];
70$NL = [:LineBreak =  Next_Line:];
71$NSX = [\u301C \u30A0 \u3005 \u303B \u309D \u309E \u30FD \u30FE \u203C \u2047 \u2048 \u2049 \u30FB \uFF1A \uFF1B \uFF65];
72$NS = [[:LineBreak =  Nonstarter:] - $NSX];
73$NU = [:LineBreak =  Numeric:];
74$OP = [[:LineBreak =  Open_Punctuation:] \u201c];
75$POX = [\u00B0 \u2030 \u2032 \u2033 \u2035 \u2103 \u2109 \uFE6A \uFF05 \uFFE0];
76$PO = [[:LineBreak =  Postfix_Numeric:] - $POX];
77$PRX = [\u00A4 \u00B1 \u20AC \u2116 \uFE69 \uFF04 \uFFE1 \uFFE5 \uFFE6];
78$PR = [[:LineBreak =  Prefix_Numeric:] - $PRX];
79$QU = [[:LineBreak =  Quotation:] - [\u201c\u201d]];
80$RI = [:LineBreak =  Regional_Indicator:];
81$SA = [:LineBreak =  Complex_Context:];
82$SG = [:LineBreak =  Surrogate:];
83$SP = [:LineBreak =  Space:];
84$SY = [:LineBreak =  Break_Symbols:];
85$WJ = [:LineBreak =  Word_Joiner:];
86$XX = [:LineBreak =  Unknown:];
87$ZW = [:LineBreak =  ZWSpace:];
88$ZWJ = [:LineBreak = ZWJ:];
89
90# OP30 and CP30 are variants of OP and CP that appear in-line in rule LB30 from UAX 14,
91# without a formal name. Because ICU rules require multiple uses of the expressions,
92# give them a single definition with a name
93
94$OP30 = [$OP - [\p{ea=F}\p{ea=W}\p{ea=H}]];
95$CP30 = [$CP - [\p{ea=F}\p{ea=W}\p{ea=H}]];
96
97# By LB9, a ZWJ also behaves as a CM. Including it in the definition of CM avoids having to explicitly
98#         list it in the numerous rules that use CM.
99# By LB1, SA characters with general categor of Mn or Mc also resolve to CM.
100
101$CM = [[:LineBreak = Combining_Mark:] $ZWJ [$SA & [[:Mn:][:Mc:]]]];
102$CMX = [[$CM] - [$ZWJ]];
103
104#   Dictionary character set, for triggering language-based break engines. Currently
105#   limited to LineBreak=Complex_Context (SA).
106
107$dictionary = [$SA];
108
109#
110#  Rule LB1.  By default, treat AI  (characters with ambiguous east Asian width),
111#                               SA  (Dictionary chars, excluding Mn and Mc)
112#                               SG  (Unpaired Surrogates)
113#                               XX  (Unknown, unassigned)
114#                         as $AL  (Alphabetic)
115#
116$ALPlus = [$AL $AI $SG $XX [$SA-[[:Mn:][:Mc:]]]];
117
118
119## -------------------------------------------------
120
121#
122# CAN_CM  is the set of characters that may combine with CM combining chars.
123#         Note that Linebreak UAX 14's concept of a combining char and the rules
124#         for what they can combine with are _very_ different from the rest of Unicode.
125#
126#         Note that $CM itself is left out of this set.  If CM is needed as a base
127#         it must be listed separately in the rule.
128#
129$CAN_CM  = [^$SP $BK $CR $LF $NL $ZW $CM];       # Bases that can   take CMs
130$CANT_CM = [ $SP $BK $CR $LF $NL $ZW $CM];       # Bases that can't take CMs
131
132#
133# AL_FOLLOW  set of chars that can unconditionally follow an AL
134#            Needed in rules where stand-alone $CM s are treated as AL.
135#
136$AL_FOLLOW      = [$BK $CR $LF $NL $ZW $SP $CL $CP $EX $HL $IS $SY $WJ $GL $OP30 $QU $BA $HY $NS $IN $NU $PR $PO $POX $ALPlus];
137
138
139#
140#  Rule LB 4, 5    Mandatory (Hard) breaks.
141#
142$LB4Breaks    = [$BK $CR $LF $NL];
143$LB4NonBreaks = [^$BK $CR $LF $NL $CM];
144$CR $LF {100};
145
146#
147#  LB 6    Do not break before hard line breaks.
148#
149$LB4NonBreaks?  $LB4Breaks {100};    # LB 5  do not break before hard breaks.
150$CAN_CM $CM*    $LB4Breaks {100};
151^$CM+           $LB4Breaks {100};
152
153# LB 7         x SP
154#              x ZW
155$LB4NonBreaks [$SP $ZW];
156$CAN_CM $CM*  [$SP $ZW];
157^$CM+         [$SP $ZW];
158
159#
160# LB 8         Break after zero width space
161#              ZW SP* ÷
162#
163$LB8Breaks    = [$LB4Breaks $ZW];
164$LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]];
165$ZW $SP* / [^$SP $ZW $LB4Breaks];
166
167# LB 8a        ZWJ x            Do not break Emoji ZWJ sequences.
168#
169$ZWJ [^$CM];
170
171# LB 9     Combining marks.      X   $CM needs to behave like X, where X is not $SP, $BK $CR $LF $NL
172#                                $CM not covered by the above needs to behave like $AL
173#                                See definition of $CAN_CM.
174
175$CAN_CM $CM+;                   #  Stick together any combining sequences that don't match other rules.
176^$CM+;
177
178#
179# LB 11  Do not break before or after WORD JOINER & related characters.
180#
181$CAN_CM $CM*  $WJ;
182$LB8NonBreaks $WJ;
183^$CM+         $WJ;
184
185$WJ $CM* .;
186
187#
188# LB 12  Do not break after NBSP and related characters.
189#         GL  x
190#
191$GL $CM* .;
192
193#
194# LB 12a  Do not break before NBSP and related characters ...
195#            [^SP BA HY] x GL
196#
197[[$LB8NonBreaks] - [$SP $BA $BAX $HY]] $CM* $GL;
198^$CM+ $GL;
199
200
201
202# LB 13   Don't break before ']' or '!' or or '/', even after spaces.
203#
204# Do not include $EXX here
205$LB8NonBreaks $CL;
206$CAN_CM $CM*  $CL;
207^$CM+         $CL;              # by rule 10, stand-alone CM behaves as AL
208
209$LB8NonBreaks $CP;
210$CAN_CM $CM*  $CP;
211^$CM+         $CP;              # by rule 10, stand-alone CM behaves as AL
212
213$LB8NonBreaks $EX;
214$CAN_CM $CM*  $EX;
215^$CM+         $EX;              # by rule 10, stand-alone CM behaves as AL
216
217$LB8NonBreaks $SY;
218$CAN_CM $CM*  $SY;
219^$CM+         $SY;              # by rule 10, stand-alone CM behaves as AL
220
221
222#
223# LB 14  Do not break after OP, even after spaces
224#        Note subtle interaction with "SP IS /" rules in LB14a.
225#        This rule consumes the SP, chaining happens on the IS, effectivley overriding the  SP IS rules,
226#        which is the desired behavior.
227#
228$OP $CM* $SP* .;
229
230$OP $CM* $SP+ $CM+ $AL_FOLLOW?;    # by rule 10, stand-alone CM behaves as AL
231                                   # by rule 8, CM following a SP is stand-alone.
232
233
234# LB 14a Force a break before start of a number with a leading decimal pt, e.g. " .23"
235#        Note: would be simpler to express as "$SP / $IS $CM* $NU;", but ICU rules have limitations.
236#        See issue ICU-20303
237
238
239$CanFollowIS = [$BK $CR $LF $NL $SP $ZW $WJ $GL $CL $CP $EX $IS $SY $QU $BA $HY $NS $ALPlus $HL $IN];
240$SP $IS           / [^ $CanFollowIS $NU $CM];
241$SP $IS $CM* $CMX / [^ $CanFollowIS $NU $CM];
242
243#
244# LB 14b Do not break before numeric separators (IS), even after spaces.
245
246[$LB8NonBreaks - $SP] $IS;
247$SP $IS $CM* [$CanFollowIS {eof}];
248$SP $IS $CM* $ZWJ [^$CM $NU];
249
250$CAN_CM $CM*  $IS;
251^$CM+         $IS;              # by rule 10, stand-alone CM behaves as AL
252
253
254# LB 15
255$QU $CM* $SP* $OP;
256
257# LB 16
258# Do not break between closing punctuation and $NS, even with intervening spaces
259# But DO allow a break between closing punctuation and $NSX, don't include it here
260($CL | $CP) $CM* $SP* $NS;
261
262# LB 17
263$B2 $CM* $SP* $B2;
264
265#
266# LB 18  Break after spaces.
267#
268$LB18NonBreaks = [$LB8NonBreaks - [$SP]];
269$LB18Breaks    = [$LB8Breaks $SP];
270
271
272# LB 19
273#         x QU
274$LB18NonBreaks $CM* $QU;
275^$CM+               $QU;
276
277#         QU  x
278$QU $CM* .;
279
280# LB 20
281#        <break>  $CB
282#        $CB   <break>
283#
284$LB20NonBreaks = [$LB18NonBreaks - $CB];
285
286# LB 20.09    Don't break between Hyphens and Letters when there is a break preceding the hyphen.
287#             Originally added as a Finnish tailoring, now promoted to default ICU behavior.
288#             Note: this is not default UAX-14 behaviour. See issue ICU-8151.
289#
290^($HY | $HH) $CM* $ALPlus;
291
292# LB 21        x   (BA | HY | NS)
293#           BB x
294#
295# DO allow breaks here before $BAX and $NSX, so don't include them
296$LB20NonBreaks $CM* ($BA | $HY | $NS);
297
298
299^$CM+ ($BA | $HY | $NS);
300
301$BB $CM* [^$CB];                                  #  $BB  x
302$BB $CM* $LB20NonBreaks;
303
304# LB 21a Don't break after Hebrew + Hyphen
305#   HL (HY | BA) x
306#
307$HL $CM* ($HY | $BA | $BAX) $CM* [^$CB]?;
308
309# LB 21b (forward) Don't break between SY and HL
310# (break between HL and SY already disallowed by LB 13 above)
311$SY $CM* $HL;
312
313
314# LB 22  Do not break before ellipses
315#
316[$LB20NonBreaks - $IN] $CM*    $IN;    # line_loose tailoring
317^$CM+ $IN;
318
319
320# LB 23
321#
322($ALPlus | $HL) $CM* $NU;
323^$CM+  $NU;       # Rule 10, any otherwise unattached CM behaves as AL
324$NU $CM* ($ALPlus | $HL);
325
326# LB 23a
327# Do not include $POX here
328#
329$PR $CM* ($ID | $EB | $EM);
330($ID | $EB | $EM) $CM*  $PO;
331
332
333#
334# LB 24
335#
336# Do not include $PRX here
337($PR | $PO | $POX) $CM* ($ALPlus | $HL);
338($ALPlus | $HL) $CM* ($PR | $PO | $POX);     # TODO: should this be ($PR | $PRX | $PO)
339^$CM+ ($PR | $PO | $POX);       # Rule 10, any otherwise unattached CM behaves as AL
340
341#
342# LB 25   Numbers.
343#
344# Here do not include $PRX at the beginning or $POX at the end
345(($PR | $PO | $POX) $CM*)? (($OP | $HY) $CM*)? ($IS $CM*)? $NU ($CM* ($NU | $SY | $IS))*
346    ($CM* ($CL | $CP))? ($CM* ($PR | $PRX | $PO))?;
347
348# LB 26  Do not break a Korean syllable
349#
350$JL $CM* ($JL | $JV | $H2 | $H3);
351($JV | $H2) $CM* ($JV | $JT);
352($JT | $H3) $CM* $JT;
353
354# LB 27  Treat korean Syllable Block the same as ID  (don't break it)
355# Do not include $POX or $PRX here
356($JL | $JV | $JT | $H2 | $H3) $CM* $IN;
357($JL | $JV | $JT | $H2 | $H3) $CM* $PO;
358$PR $CM* ($JL | $JV | $JT | $H2 | $H3);
359
360
361# LB 28   Do not break between alphabetics
362#
363($ALPlus | $HL) $CM* ($ALPlus | $HL);
364^$CM+ ($ALPlus | $HL);      # The $CM+ is from rule 10, an unattached CM is treated as AL
365
366# LB 29
367$IS $CM* ($ALPlus | $HL);
368
369# LB 30
370($ALPlus | $HL | $NU) $CM* $OP30;
371^$CM+ $OP30;         # The $CM+ is from rule 10, an unattached CM is treated as AL.
372$CP30 $CM* ($ALPlus | $HL | $NU);
373
374# LB 30a  Do not break between regional indicators. Break after pairs of them.
375#         Tricky interaction with LB8a: ZWJ x .   together with ZWJ acting like a CM.
376$RI $CM* $RI                 / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $IN $CM]];
377$RI $CM* $RI $CM* [$CM-$ZWJ] / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $IN $CM]];
378$RI $CM* $RI $CM* [$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $IN $ZWJ {eof}];
379# note: the preceding rule includes {eof} rather than having the last [set] term qualified with '?'
380#       because of the chain-out behavior difference. The rule must chain out only from the [set characters],
381#       not from the preceding $RI or $CM, which it would be able to do if the set were optional.
382
383# LB 30b Do not break between an Emoji Base and an Emoji Modifier
384$EB $CM* $EM;
385
386# LB 31 Break everywhere else.
387#       Match a single code point if no other rule applies.
388.;
389