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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 37 for Unicode 9.0
11#         http://www.unicode.org/reports/tr14/
12#
13#         Includes extensions to the handling of emoji ZWJ sequences from
14#         https://goo.gl/cluFCn
15#
16#         tailored as noted in 2nd paragraph below.
17#
18#         TODO:  Rule LB 8 remains as it was in Unicode 5.2
19#         This is only because of a limitation of ICU break engine implementation,
20#         not because the older behavior is desirable.
21#
22#         This tailors the line break behavior to correspond to CSS
23#         line-break=loose (BCP47 -u-lb-loose) as defined for Chinese & Japanese.
24#         It sets characters of class CJ to behave like ID.
25#         In addition, it allows breaks:
26#         * before hyphens 2010 & 2013 (both BA) and 301C, 30A0 (both NS)
27#         * before iteration marks 3005, 303B, 309D, 309E, 30FD, 30FE (all NS)
28#         * between characters of LineBreak class IN such as 2026
29#         * before some centered punct 203C, 2047, 2048, 2049, 30FB, FF1A, FF1B,
30#           FF65 (all NS) and FF01, FF1F (both EX).
31#         * before suffix characters with LineBreak class PO and EastAsianWidth A,F,W;
32#           this includes: 00B0 2030 2032 2033 2035 2103 2109 FE6A FF05 FFE0
33#         * after prefix characters with LineBreak class PR and EastAsianWidth A,F,W;
34#           this includes: 00A4 00B1 20AC 2116 FE69 FF04 FFE1 FFE5 FFE6
35
36
37#
38#  Character Classes defined by TR 14.
39#
40
41!!chain;
42!!quoted_literals_only;
43
44$AI = [:LineBreak =  Ambiguous:];
45$AL = [:LineBreak =  Alphabetic:];
46$BAX = [\u2010 \u2013];
47$BA = [[:LineBreak =  Break_After:] - $BAX];
48$BB = [:LineBreak =  Break_Before:];
49$BK = [:LineBreak =  Mandatory_Break:];
50$B2 = [:LineBreak =  Break_Both:];
51$CB = [:LineBreak =  Contingent_Break:];
52$CJ = [:LineBreak =  Conditional_Japanese_Starter:];
53$CL = [:LineBreak =  Close_Punctuation:];
54# $CM = [:LineBreak =  Combining_Mark:];
55$CP = [:LineBreak =  Close_Parenthesis:];
56$CR = [:LineBreak =  Carriage_Return:];
57$EB = [:LineBreak =  EB:];
58$EM = [:LineBreak =  EM:];
59$EXX = [\uFF01 \uFF1F];
60$EX = [[:LineBreak =  Exclamation:] - $EXX];
61$GL = [:LineBreak =  Glue:];
62$HL = [:LineBreak =  Hebrew_Letter:];
63$HY = [:LineBreak =  Hyphen:];
64$H2 = [:LineBreak =  H2:];
65$H3 = [:LineBreak =  H3:];
66# CSS Loose tailoring: CJ resolves to ID
67$ID = [[:LineBreak =  Ideographic:] $CJ];
68$IN = [:LineBreak =  Inseperable:];
69$IS = [:LineBreak =  Infix_Numeric:];
70$JL = [:LineBreak =  JL:];
71$JV = [:LineBreak =  JV:];
72$JT = [:LineBreak =  JT:];
73$LF = [:LineBreak =  Line_Feed:];
74$NL = [:LineBreak =  Next_Line:];
75$NSX = [\u301C \u30A0 \u3005 \u303B \u309D \u309E \u30FD \u30FE \u203C \u2047 \u2048 \u2049 \u30FB \uFF1A \uFF1B \uFF65];
76$NS = [[:LineBreak =  Nonstarter:] - $NSX];
77$NU = [:LineBreak =  Numeric:];
78$OP = [:LineBreak =  Open_Punctuation:];
79$POX = [\u00B0 \u2030 \u2032 \u2033 \u2035 \u2103 \u2109 \uFE6A \uFF05 \uFFE0];
80$PO = [[:LineBreak =  Postfix_Numeric:] - $POX];
81$PRX = [\u00A4 \u00B1 \u20AC \u2116 \uFE69 \uFF04 \uFFE1 \uFFE5 \uFFE6];
82$PR = [[:LineBreak =  Prefix_Numeric:] - $PRX];
83$QU = [:LineBreak =  Quotation:];
84$RI = [:LineBreak =  Regional_Indicator:];
85$SA = [:LineBreak =  Complex_Context:];
86$SG = [:LineBreak =  Surrogate:];
87$SP = [:LineBreak =  Space:];
88$SY = [:LineBreak =  Break_Symbols:];
89$WJ = [:LineBreak =  Word_Joiner:];
90$XX = [:LineBreak =  Unknown:];
91$ZW = [:LineBreak =  ZWSpace:];
92$ZWJ = [:LineBreak = ZWJ:];
93
94$EmojiNRK = [[\p{Emoji}] - [$RI \u002a\u00230-9©®™〰〽]];
95# Data for Extended Pictographic scraped from CLDR common/properties/ExtendedPictographic.txt, r13267
96$Extended_Pict = [\U0001F774-\U0001F77F\U00002700-\U00002701\U00002703-\U00002704\U0000270E\U00002710-\U00002711\U00002765-\U00002767\U0001F030-\U0001F093\U0001F094-\U0001F09F\U0001F10D-\U0001F10F\U0001F12F\U0001F16C-\U0001F16F\U0001F1AD-\U0001F1E5\U0001F260-\U0001F265\U0001F203-\U0001F20F\U0001F23C-\U0001F23F\U0001F249-\U0001F24F\U0001F252-\U0001F25F\U0001F266-\U0001F2FF\U0001F7D5-\U0001F7FF\U0001F000-\U0001F003\U0001F005-\U0001F02B\U0001F02C-\U0001F02F\U0001F322-\U0001F323\U0001F394-\U0001F395\U0001F398\U0001F39C-\U0001F39D\U0001F3F1-\U0001F3F2\U0001F3F6\U0001F4FE\U0001F53E-\U0001F548\U0001F54F\U0001F568-\U0001F56E\U0001F571-\U0001F572\U0001F57B-\U0001F586\U0001F588-\U0001F589\U0001F58E-\U0001F58F\U0001F591-\U0001F594\U0001F597-\U0001F5A3\U0001F5A6-\U0001F5A7\U0001F5A9-\U0001F5B0\U0001F5B3-\U0001F5BB\U0001F5BD-\U0001F5C1\U0001F5C5-\U0001F5D0\U0001F5D4-\U0001F5DB\U0001F5DF-\U0001F5E0\U0001F5E2\U0001F5E4-\U0001F5E7\U0001F5E9-\U0001F5EE\U0001F5F0-\U0001F5F2\U0001F5F4-\U0001F5F9\U00002605\U00002607-\U0000260D\U0000260F-\U00002610\U00002612\U00002616-\U00002617\U00002619-\U0000261C\U0000261E-\U0000261F\U00002621\U00002624-\U00002625\U00002627-\U00002629\U0000262B-\U0000262D\U00002630-\U00002637\U0000263B-\U00002647\U00002654-\U0000265F\U00002661-\U00002662\U00002664\U00002667\U00002669-\U0000267A\U0000267C-\U0000267E\U00002680-\U00002691\U00002695\U00002698\U0000269A\U0000269D-\U0000269F\U000026A2-\U000026A9\U000026AC-\U000026AF\U000026B2-\U000026BC\U000026BF-\U000026C3\U000026C6-\U000026C7\U000026C9-\U000026CD\U000026D0\U000026D2\U000026D5-\U000026E8\U000026EB-\U000026EF\U000026F6\U000026FB-\U000026FC\U000026FE-\U000026FF\U00002388\U0001FA00-\U0001FFFD\U0001F0A0-\U0001F0AE\U0001F0B1-\U0001F0BF\U0001F0C1-\U0001F0CF\U0001F0D1-\U0001F0F5\U0001F0AF-\U0001F0B0\U0001F0C0\U0001F0D0\U0001F0F6-\U0001F0FF\U0001F80C-\U0001F80F\U0001F848-\U0001F84F\U0001F85A-\U0001F85F\U0001F888-\U0001F88F\U0001F8AE-\U0001F8FF\U0001F900-\U0001F90B\U0001F91F\U0001F928-\U0001F92F\U0001F931-\U0001F932\U0001F94C\U0001F95F-\U0001F96B\U0001F992-\U0001F997\U0001F9D0-\U0001F9E6\U0001F90C-\U0001F90F\U0001F93F\U0001F94D-\U0001F94F\U0001F96C-\U0001F97F\U0001F998-\U0001F9BF\U0001F9C1-\U0001F9CF\U0001F9E7-\U0001F9FF\U0001F6C6-\U0001F6CA\U0001F6D3-\U0001F6D4\U0001F6E6-\U0001F6E8\U0001F6EA\U0001F6F1-\U0001F6F2\U0001F6F7-\U0001F6F8\U0001F6D5-\U0001F6DF\U0001F6ED-\U0001F6EF\U0001F6F9-\U0001F6FF];
97
98# By LB9, a ZWJ also behaves as a CM. Including it in the definition of CM avoids having to explicitly
99#         list it in the numerous rules that use CM.
100# By LB1, SA characters with general categor of Mn or Mc also resolve to CM.
101
102$CM = [[:LineBreak = Combining_Mark:] $ZWJ [$SA & [[:Mn:][:Mc:]]]];
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!!forward;
122
123#
124# CAN_CM  is the set of characters that may combine with CM combining chars.
125#         Note that Linebreak UAX 14's concept of a combining char and the rules
126#         for what they can combine with are _very_ different from the rest of Unicode.
127#
128#         Note that $CM itself is left out of this set.  If CM is needed as a base
129#         it must be listed separately in the rule.
130#
131$CAN_CM  = [^$SP $BK $CR $LF $NL $ZW $CM];       # Bases that can   take CMs
132$CANT_CM = [ $SP $BK $CR $LF $NL $ZW $CM];       # Bases that can't take CMs
133
134#
135# AL_FOLLOW  set of chars that can unconditionally follow an AL
136#            Needed in rules where stand-alone $CM s are treated as AL.
137#
138$AL_FOLLOW      = [$BK $CR $LF $NL $ZW $SP $CL $CP $EX $HL $IS $SY $WJ $GL $OP $QU $BA $HY $NS $IN $NU $PR $PO $POX $ALPlus];
139
140
141#
142#  Rule LB 4, 5    Mandatory (Hard) breaks.
143#
144$LB4Breaks    = [$BK $CR $LF $NL];
145$LB4NonBreaks = [^$BK $CR $LF $NL $CM];
146$CR $LF {100};
147
148#
149#  LB 6    Do not break before hard line breaks.
150#
151$LB4NonBreaks?  $LB4Breaks {100};    # LB 5  do not break before hard breaks.
152$CAN_CM $CM*    $LB4Breaks {100};
153^$CM+           $LB4Breaks {100};
154
155# LB 7         x SP
156#              x ZW
157$LB4NonBreaks [$SP $ZW];
158$CAN_CM $CM*  [$SP $ZW];
159^$CM+         [$SP $ZW];
160
161#
162# LB 8         Break after zero width space
163#              TODO:  ZW SP* <break>
164#              An engine change is required to write the reverse rule for this.
165#              For now, leave the Unicode 5.2 rule, ZW <break>
166#
167$LB8Breaks    = [$LB4Breaks $ZW];
168$LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]];
169
170# LB 8a        ZWJ x (ID | Extended_Pict | EmojiNRK)   Emoji ZWJ sequences.
171#
172$ZWJ ($ID | $Extended_Pict | $EmojiNRK);
173
174# LB 9     Combining marks.      X   $CM needs to behave like X, where X is not $SP, $BK $CR $LF $NL
175#                                $CM not covered by the above needs to behave like $AL
176#                                See definition of $CAN_CM.
177
178$CAN_CM $CM+;                   #  Stick together any combining sequences that don't match other rules.
179^$CM+;
180
181#
182# LB 11  Do not break before or after WORD JOINER & related characters.
183#
184$CAN_CM $CM*  $WJ;
185$LB8NonBreaks $WJ;
186^$CM+         $WJ;
187
188$WJ $CM* .;
189
190#
191# LB 12  Do not break after NBSP and related characters.
192#         GL  x
193#
194$GL $CM* .;
195
196#
197# LB 12a  Do not break before NBSP and related characters ...
198#            [^SP BA HY] x GL
199#
200[[$LB8NonBreaks] - [$SP $BA $BAX $HY]] $CM* $GL;
201^$CM+ $GL;
202
203
204#
205# LB 13   Don't break before ']' or '!' or ';' or '/', even after spaces.
206#
207# Do not include $EXX here
208$LB8NonBreaks $CL;
209$CAN_CM $CM*  $CL;
210^$CM+         $CL;              # by rule 10, stand-alone CM behaves as AL
211
212$LB8NonBreaks $CP;
213$CAN_CM $CM*  $CP;
214^$CM+         $CP;              # by rule 10, stand-alone CM behaves as AL
215
216$LB8NonBreaks $EX;
217$CAN_CM $CM*  $EX;
218^$CM+         $EX;              # by rule 10, stand-alone CM behaves as AL
219
220$LB8NonBreaks $IS;
221$CAN_CM $CM*  $IS;
222^$CM+         $IS;              # by rule 10, stand-alone CM behaves as AL
223
224$LB8NonBreaks $SY;
225$CAN_CM $CM*  $SY;
226^$CM+         $SY;              # by rule 10, stand-alone CM behaves as AL
227
228
229#
230# LB 14  Do not break after OP, even after spaces
231#
232$OP $CM* $SP* .;
233
234$OP $CM* $SP+ $CM+ $AL_FOLLOW?;    # by rule 10, stand-alone CM behaves as AL
235                                   # by rule 8, CM following a SP is stand-alone.
236
237# LB 15
238$QU $CM* $SP* $OP;
239
240# LB 16
241# Do not break between closing punctuation and $NS, even with intervening spaces
242# But DO allow a break between closing punctuation and $NSX, don't include it here
243($CL | $CP) $CM* $SP* $NS;
244
245# LB 17
246$B2 $CM* $SP* $B2;
247
248#
249# LB 18  Break after spaces.
250#
251$LB18NonBreaks = [$LB8NonBreaks - [$SP]];
252$LB18Breaks    = [$LB8Breaks $SP];
253
254
255# LB 19
256#         x QU
257$LB18NonBreaks $CM* $QU;
258^$CM+               $QU;
259
260#         QU  x
261$QU $CM* .;
262
263
264# LB 20
265#        <break>  $CB
266#        $CB   <break>
267
268$LB20NonBreaks = [$LB18NonBreaks - $CB];
269
270# LB 21        x   (BA | HY | NS)
271#           BB x
272#
273# DO allow breaks here before $BAX and $NSX, so don't include them
274$LB20NonBreaks $CM* ($BA | $HY | $NS);
275^$CM+ ($BA | $HY | $NS);
276
277$BB $CM* [^$CB];                                  #  $BB  x
278$BB $CM* $LB20NonBreaks;
279
280# LB 21a Don't break after Hebrew + Hyphen
281#   HL (HY | BA) x
282#
283$HL $CM* ($HY | $BA | $BAX) $CM* [^$CB]?;
284
285# LB 21b (forward) Don't break between SY and HL
286# (break between HL and SY already disallowed by LB 13 above)
287$SY $CM* $HL;
288
289# LB 22
290($ALPlus | $HL) $CM* $IN;
291^$CM+    $IN;     #  by rule 10, any otherwise unattached CM behaves as AL
292$EX $CM*    $IN;
293($ID | $EB | $EM) $CM*  $IN;
294# $IN $CM*    $IN;  # delete this rule for CSS loose
295$NU $CM*    $IN;
296
297
298# $LB 23
299#
300($ALPlus | $HL) $CM* $NU;
301^$CM+  $NU;       # Rule 10, any otherwise unattached CM behaves as AL
302$NU $CM* ($ALPlus | $HL);
303
304# LB 23a
305# Do not include $POX here
306#
307$PR $CM* ($ID | $EB | $EM);
308($ID | $EB | $EM) $CM*  $PO;
309
310
311#
312# LB 24
313#
314# Do not include $PRX here
315($PR | $PO | $POX) $CM* ($ALPlus | $HL);
316($ALPlus | $HL) $CM* ($PR | $PO | $POX);     # TODO: should this be ($PR | $PRX | $PO)
317^$CM+ ($PR | $PO | $POX);       # Rule 10, any otherwise unattached CM behaves as AL
318
319#
320# LB 25   Numbers.
321#
322# Here do not include $PRX at the beginning or $POX at the end
323(($PR | $PO | $POX) $CM*)? (($OP | $HY) $CM*)? $NU ($CM* ($NU | $SY | $IS))*
324    ($CM* ($CL | $CP))? ($CM* ($PR | $PRX | $PO))?;
325
326# LB 26  Do not break a Korean syllable
327#
328$JL $CM* ($JL | $JV | $H2 | $H3);
329($JV | $H2) $CM* ($JV | $JT);
330($JT | $H3) $CM* $JT;
331
332# LB 27  Treat korean Syllable Block the same as ID  (don't break it)
333# Do not include $POX or $PRX here
334($JL | $JV | $JT | $H2 | $H3) $CM* $IN;
335($JL | $JV | $JT | $H2 | $H3) $CM* $PO;
336$PR $CM* ($JL | $JV | $JT | $H2 | $H3);
337
338
339# LB 28   Do not break between alphabetics
340#
341($ALPlus | $HL) $CM* ($ALPlus | $HL);
342^$CM+ ($ALPlus | $HL);      # The $CM+ is from rule 10, an unattached CM is treated as AL
343
344# LB 29
345$IS $CM* ($ALPlus | $HL);
346
347# LB 30
348($ALPlus | $HL | $NU) $CM* $OP;
349^$CM+ $OP;         # The $CM+ is from rule 10, an unattached CM is treated as AL.
350$CP $CM* ($ALPlus | $HL | $NU);
351
352# LB 30a  Do not break between regional indicators. Break after pairs of them.
353#         Tricky interaction with LB8a: ZWJ x ID
354$RI $CM* $RI                / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM] {eof}];
355$RI $CM* $RI $CM*  $ZWJ     / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM $ID $Extended_Pict $EmojiNRK] {eof}];
356$RI $CM* $RI $CM* [$CM-$ZWJ] / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM] {eof}];
357
358$RI $CM* $RI $CM* [$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS {eof}];
359$RI $CM* $RI $CM* $ZWJ ($ID | $Extended_Pict | $EmojiNRK);
360
361# LB 30b Do not break between an Emoji Base and an Emoji Modifier
362$EB $CM* $EM;
363
364# LB 31 Break everywhere else.
365#       Match a single code point if no other rule applies.
366.;
367
368## -------------------------------------------------
369
370!!safe_reverse;
371
372# LB 9
373^$CM+ [^$CM $BK $CR $LF $NL $ZW $SP];
374
375# LB 14
376$SP+ $CM* $OP;
377
378# LB 15
379$SP+ $CM* $QU;
380
381# LB 16
382$SP+ $CM* ($CL | $CP);
383
384# LB 17
385$SP+ $CM* $B2;
386
387# LB 21
388$CM* ($HY | $BA | $BAX) $CM* $HL;
389
390# LB 25
391($CM* ($IS | $SY))+ $CM* $NU;
392($CL | $CP) $CM* ($NU | $IS | $SY);
393
394#  LB 30
395($CM* $RI)+;
396
397# For dictionary-based break
398$dictionary $dictionary;
399