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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_normal_fi.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#         tailored as noted in 3rd paragraph below.
13#
14#         Includes extensions to the handling of emoji ZWJ sequences from
15#         https://goo.gl/cluFCn
16#
17#         TODO:  Rule LB 8 remains as it was in Unicode 5.2
18#         This is only because of a limitation of ICU break engine implementation,
19#         not because the older behavior is desirable.
20#
21#         This tailors the line break behavior for Finnish, and to correspond to CSS
22#         line-break=normal (BCP47 -u-lb-normal) as defined for languages other than
23#         Chinese & Japanese.
24#         It sets characters of class CJ to behave like ID.
25
26#
27#  Character Classes defined by TR 14.
28#
29
30!!chain;
31
32$AI = [:LineBreak =  Ambiguous:];
33$AL = [:LineBreak =  Alphabetic:];
34$BA = [:LineBreak =  Break_After:];
35$HH = [\u2010];     # \u2010 is HYPHEN, default line break is BA.
36$BB = [:LineBreak =  Break_Before:];
37$BK = [:LineBreak =  Mandatory_Break:];
38$B2 = [:LineBreak =  Break_Both:];
39$CB = [:LineBreak =  Contingent_Break:];
40$CJ = [:LineBreak =  Conditional_Japanese_Starter:];
41$CL = [:LineBreak =  Close_Punctuation:];
42# $CM = [:LineBreak =  Combining_Mark:];
43$CP = [:LineBreak =  Close_Parenthesis:];
44$CR = [:LineBreak =  Carriage_Return:];
45$EB = [[:LineBreak =  EB:]\U0001F3C2\U0001F3C7\U0001F3CC\U0001F46A-\U0001F46D\U0001F46F\U0001F574\U0001F6CC];
46$EM = [:LineBreak =  EM:];
47$EX = [:LineBreak =  Exclamation:];
48$GL = [:LineBreak =  Glue:];
49$HL = [:LineBreak =  Hebrew_Letter:];
50$HY = [:LineBreak =  Hyphen:];
51$H2 = [:LineBreak =  H2:];
52$H3 = [:LineBreak =  H3:];
53# CSS Normal tailoring: CJ resolves to ID
54$ID = [[:LineBreak =  Ideographic:] $CJ];
55$IN = [:LineBreak =  Inseperable:];
56$IS = [:LineBreak =  Infix_Numeric:];
57$JL = [:LineBreak =  JL:];
58$JV = [:LineBreak =  JV:];
59$JT = [:LineBreak =  JT:];
60$LF = [:LineBreak =  Line_Feed:];
61$NL = [:LineBreak =  Next_Line:];
62$NS = [:LineBreak =  Nonstarter:];
63$NU = [:LineBreak =  Numeric:];
64$OP = [:LineBreak =  Open_Punctuation:];
65$PO = [:LineBreak =  Postfix_Numeric:];
66$PR = [:LineBreak =  Prefix_Numeric:];
67$QU = [:LineBreak =  Quotation:];
68$RI = [:LineBreak =  Regional_Indicator:];
69$SA = [:LineBreak =  Complex_Context:];
70$SG = [:LineBreak =  Surrogate:];
71$SP = [:LineBreak =  Space:];
72$SY = [:LineBreak =  Break_Symbols:];
73$WJ = [:LineBreak =  Word_Joiner:];
74$XX = [:LineBreak =  Unknown:];
75$ZW = [:LineBreak =  ZWSpace:];
76$ZWJ = [:LineBreak = ZWJ:];
77
78$EmojiNRK = [[\p{Emoji}] - [$RI \u002a\u00230-9©®™〰〽]];
79# Data for Extended Pictographic scraped from CLDR common/properties/ExtendedPictographic.txt, r12773
80$Extended_Pict = [\U0001F774-\U0001F77F\u2700-\u2701\u2703-\u2704\u270E\u2710-\u2711\u2765-\u2767\U0001F030-\U0001F093\U0001F094-\U0001F09F\U0001F10D-\U0001F10F\U0001F12F\U0001F16C-\U0001F16F\U0001F1AD-\U0001F1E5\U0001F203-\U0001F20F\U0001F23C-\U0001F23F\U0001F249-\U0001F24F\U0001F252-\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\u2605\u2607-\u260D\u260F-\u2610\u2612\u2616-\u2617\u2619-\u261C\u261E-\u261F\u2621\u2624-\u2625\u2627-\u2629\u262B-\u262D\u2630-\u2637\u263B-\u2647\u2654-\u265F\u2661-\u2662\u2664\u2667\u2669-\u267A\u267C-\u267E\u2680-\u2691\u2695\u2698\u269A\u269D-\u269F\u26A2-\u26A9\u26AC-\u26AF\u26B2-\u26BC\u26BF-\u26C3\u26C6-\u26C7\u26C9-\u26CD\u26D0\u26D2\u26D5-\u26E8\u26EB-\u26EF\u26F6\u26FB-\u26FC\u26FE-\u26FF\u2388\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-\U0001F90F\U0001F91F\U0001F928-\U0001F92F\U0001F931-\U0001F932\U0001F93F\U0001F94C-\U0001F94F\U0001F95F-\U0001F97F\U0001F992-\U0001F9BF\U0001F9C1-\U0001F9FF\U0001F6C6-\U0001F6CA\U0001F6E6-\U0001F6E8\U0001F6EA\U0001F6F1-\U0001F6F2\U0001F6D3-\U0001F6DF\U0001F6ED-\U0001F6EF\U0001F6F7-\U0001F6FF];
81
82# By LB9, a ZWJ also behaves as a CM. Including it in the definition of CM avoids having to explicitly
83#         list it in the numerous rules that use CM.
84# By LB1, SA characters with general categor of Mn or Mc also resolve to CM.
85
86$CM = [[:LineBreak = Combining_Mark:] $ZWJ [$SA & [[:Mn:][:Mc:]]]];
87
88#   Dictionary character set, for triggering language-based break engines. Currently
89#   limited to LineBreak=Complex_Context (SA).
90
91$dictionary = [$SA];
92
93#
94#  Rule LB1.  By default, treat AI  (characters with ambiguous east Asian width),
95#                               SA  (Dictionary chars, excluding Mn and Mc)
96#                               SG  (Unpaired Surrogates)
97#                               XX  (Unknown, unassigned)
98#                         as $AL  (Alphabetic)
99#
100$ALPlus = [$AL $AI $SG $XX [$SA-[[:Mn:][:Mc:]]]];
101
102
103## -------------------------------------------------
104
105!!forward;
106
107#
108# CAN_CM  is the set of characters that may combine with CM combining chars.
109#         Note that Linebreak UAX 14's concept of a combining char and the rules
110#         for what they can combine with are _very_ different from the rest of Unicode.
111#
112#         Note that $CM itself is left out of this set.  If CM is needed as a base
113#         it must be listed separately in the rule.
114#
115$CAN_CM  = [^$SP $BK $CR $LF $NL $ZW $CM];       # Bases that can   take CMs
116$CANT_CM = [ $SP $BK $CR $LF $NL $ZW $CM];       # Bases that can't take CMs
117
118#
119# AL_FOLLOW  set of chars that can unconditionally follow an AL
120#            Needed in rules where stand-alone $CM s are treated as AL.
121#
122$AL_FOLLOW      = [$BK $CR $LF $NL $ZW $SP $CL $CP $EX $HL $IS $SY $WJ $GL $OP $QU $BA $HH $HY $NS $IN $NU $PR $PO $ALPlus];
123
124
125#
126#  Rule LB 4, 5    Mandatory (Hard) breaks.
127#
128$LB4Breaks    = [$BK $CR $LF $NL];
129$LB4NonBreaks = [^$BK $CR $LF $NL $CM];
130$CR $LF {100};
131
132#
133#  LB 6    Do not break before hard line breaks.
134#
135$LB4NonBreaks?  $LB4Breaks {100};    # LB 5  do not break before hard breaks.
136$CAN_CM $CM*    $LB4Breaks {100};
137^$CM+           $LB4Breaks {100};
138
139# LB 7         x SP
140#              x ZW
141$LB4NonBreaks [$SP $ZW];
142$CAN_CM $CM*  [$SP $ZW];
143^$CM+         [$SP $ZW];
144
145#
146# LB 8         Break after zero width space
147#              TODO:  ZW SP* <break>
148#              An engine change is required to write the reverse rule for this.
149#              For now, leave the Unicode 5.2 rule, ZW <break>
150#
151$LB8Breaks    = [$LB4Breaks $ZW];
152$LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]];
153
154# LB 8a        ZWJ x (ID | Extended_Pict | EmojiNRK)   Emoji ZWJ sequences.
155#
156$ZWJ ($ID | $Extended_Pict | $EmojiNRK);
157
158# LB 9     Combining marks.      X   $CM needs to behave like X, where X is not $SP, $BK $CR $LF $NL
159#                                $CM not covered by the above needs to behave like $AL
160#                                See definition of $CAN_CM.
161
162$CAN_CM $CM+;                   #  Stick together any combining sequences that don't match other rules.
163^$CM+;
164
165#
166# LB 11  Do not break before or after WORD JOINER & related characters.
167#
168$CAN_CM $CM*  $WJ;
169$LB8NonBreaks $WJ;
170^$CM+         $WJ;
171
172$WJ $CM* .;
173
174#
175# LB 12  Do not break after NBSP and related characters.
176#         GL  x
177#
178$GL $CM* .;
179
180#
181# LB 12a  Do not break before NBSP and related characters ...
182#            [^SP BA HY] x GL
183#
184[[$LB8NonBreaks] - [$SP $BA $HH $HY]] $CM* $GL;
185^$CM+ $GL;
186
187
188
189#
190# LB 13   Don't break before ']' or '!' or ';' or '/', even after spaces.
191#
192$LB8NonBreaks $CL;
193$CAN_CM $CM*  $CL;
194^$CM+         $CL;              # by rule 10, stand-alone CM behaves as AL
195
196$LB8NonBreaks $CP;
197$CAN_CM $CM*  $CP;
198^$CM+         $CP;              # by rule 10, stand-alone CM behaves as AL
199
200$LB8NonBreaks $EX;
201$CAN_CM $CM*  $EX;
202^$CM+         $EX;              # by rule 10, stand-alone CM behaves as AL
203
204$LB8NonBreaks $IS;
205$CAN_CM $CM*  $IS;
206^$CM+         $IS;              # by rule 10, stand-alone CM behaves as AL
207
208$LB8NonBreaks $SY;
209$CAN_CM $CM*  $SY;
210^$CM+         $SY;              # by rule 10, stand-alone CM behaves as AL
211
212
213#
214# LB 14  Do not break after OP, even after spaces
215#
216$OP $CM* $SP* .;
217
218$OP $CM* $SP+ $CM+ $AL_FOLLOW?;    # by rule 10, stand-alone CM behaves as AL
219                                   # by rule 8, CM following a SP is stand-alone.
220
221# LB 15
222$QU $CM* $SP* $OP;
223
224# LB 16
225($CL | $CP) $CM* $SP* $NS;
226
227# LB 17
228$B2 $CM* $SP* $B2;
229
230#
231# LB 18  Break after spaces.
232#
233$LB18NonBreaks = [$LB8NonBreaks - [$SP]];
234$LB18Breaks    = [$LB8Breaks $SP];
235
236
237# LB 19
238#         x QU
239$LB18NonBreaks $CM* $QU;
240^$CM+               $QU;
241
242#         QU  x
243$QU $CM* .;
244
245
246# LB 20
247#        <break>  $CB
248#        $CB   <break>
249
250$LB20NonBreaks = [$LB18NonBreaks - $CB];
251
252# LB 20.09 added rule for Finnish tailoring
253# LB 21        x   (BA | HY | NS)
254#           BB x
255#
256$LB20NonBreaks $CM* ($BA | $HH | $HY | $NS) $CM* / $AL;
257$LB20NonBreaks $CM* ($BA | $HH | $HY | $NS);
258($HY | $HH) $AL;
259^$CM+ ($BA | $HY | $HH | $NS);
260
261$BB $CM* [^$CB];                                  #  $BB  x
262$BB $CM* $LB20NonBreaks;
263
264# LB 21a Don't break after Hebrew + Hyphen
265#   HL (HY | BA) x
266#
267$HL $CM* ($HY | $BA | $HH) $CM* [^$CB]?;
268
269# LB 21b (forward) Don't break between SY and HL
270# (break between HL and SY already disallowed by LB 13 above)
271$SY $CM* $HL;
272
273# LB 22
274($ALPlus | $HL) $CM* $IN;
275^$CM+    $IN;     #  by rule 10, any otherwise unattached CM behaves as AL
276$EX $CM*    $IN;
277($ID | $EB | $EM) $CM*  $IN;
278$IN $CM*    $IN;
279$NU $CM*    $IN;
280
281
282# $LB 23
283#
284($ALPlus | $HL) $CM* $NU;
285^$CM+  $NU;       # Rule 10, any otherwise unattached CM behaves as AL
286$NU $CM* ($ALPlus | $HL);
287
288# LB 23a
289#
290$PR $CM* ($ID | $EB | $EM);
291($ID | $EB | $EM) $CM*  $PO;
292
293
294#
295# LB 24
296#
297($PR | $PO) $CM* ($ALPlus | $HL);
298($ALPlus | $HL) $CM* ($PR | $PO);
299^$CM+ ($PR | $PO);       # Rule 10, any otherwise unattached CM behaves as AL
300
301#
302# LB 25   Numbers.
303#
304(($PR | $PO) $CM*)? (($OP | $HY) $CM*)? $NU ($CM* ($NU | $SY | $IS))*
305    ($CM* ($CL | $CP))? ($CM* ($PR | $PO))?;
306
307# LB 26  Do not break a Korean syllable
308#
309$JL $CM* ($JL | $JV | $H2 | $H3);
310($JV | $H2) $CM* ($JV | $JT);
311($JT | $H3) $CM* $JT;
312
313# LB 27  Treat korean Syllable Block the same as ID  (don't break it)
314($JL | $JV | $JT | $H2 | $H3) $CM* $IN;
315($JL | $JV | $JT | $H2 | $H3) $CM* $PO;
316$PR $CM* ($JL | $JV | $JT | $H2 | $H3);
317
318
319# LB 28   Do not break between alphabetics
320#
321($ALPlus | $HL) $CM* ($ALPlus | $HL);
322^$CM+ ($ALPlus | $HL);      # The $CM+ is from rule 10, an unattached CM is treated as AL
323
324# LB 29
325$IS $CM* ($ALPlus | $HL);
326
327# LB 30
328($ALPlus | $HL | $NU) $CM* $OP;
329^$CM+ $OP;         # The $CM+ is from rule 10, an unattached CM is treated as AL.
330$CP $CM* ($ALPlus | $HL | $NU);
331
332# LB 30a  Do not break between regional indicators. Break after pairs of them.
333#         Tricky interaction with LB8a: ZWJ x ID
334$RI $CM* $RI                / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM] {eof}];
335$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 $EmojiNRK] {eof}];
336$RI $CM* $RI $CM* [$CM-$ZWJ] / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM] {eof}];
337
338$RI $CM* $RI $CM* [$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS {eof}];
339$RI $CM* $RI $CM* $ZWJ ($ID | $Extended_Pict | $EmojiNRK);
340
341# LB 30b Do not break between an Emoji Base and an Emoji Modifier
342$EB $CM* $EM;
343
344#
345#  Reverse Rules.
346#
347## -------------------------------------------------
348
349!!reverse;
350
351#  LB 9 Combining Marks.
352#  Stick together any combining sequences that don't match other rules.
353
354^$CM+ $CAN_CM?;
355
356#
357#  Sequences of the form  (shown forwards)
358#      [CANT_CM]  <break>  [CM]  [whatever]
359#  The CM needs to behave as an AL
360#
361$AL_FOLLOW $CM+ / (
362          [$BK $CR $LF $NL $ZW {eof}] |
363          $SP+ $CM+ $SP |
364          $SP+ $CM* ([^$OP $CM $SP] | [$AL {eof}]));   # if LB 14 will match, need to surpress this break.
365                                               #  LB14 says    OP SP* x .
366                                               #    becomes    OP SP* x AL
367                                               #    becomes    OP SP* x CM+ AL_FOLLOW
368                                               #
369                                               # Further note:  the $AL in [$AL {eof}] is only to work around
370                                               #                a rule compiler bug which complains about
371                                               #                empty sets otherwise.
372
373
374# LB 4, 5, 6
375
376$LB4Breaks [$LB4NonBreaks-$CM];
377$LB4Breaks $CM+ $CAN_CM;
378$LF $CR;
379
380
381# LB 7         x SP
382#              x ZW
383[$SP $ZW] [$LB4NonBreaks-$CM];
384[$SP $ZW] $CM+ $CAN_CM;
385
386# LB 8 ZW SP* <break>
387#     TODO: to implement this, we need more than one look-ahead hard break in play at a time.
388#           Requires an engine enhancement.
389#   / $SP* $ZW
390
391# LB 8a        ZWJ x (ID | Extended_Pict | EmojiNRK)
392#
393($ID | $Extended_Pict | $EmojiNRK) $ZWJ $CM* $CAN_CM?;
394
395
396# LB 9,10  Combining marks.
397#    X   $CM needs to behave like X, where X is not $SP or controls.
398#    $CM not covered by the above needs to behave like $AL
399# Stick together any combining sequences that don't match other rules.
400^$CM+ $CAN_CM;
401
402
403# LB 11
404#
405$WJ $CM* $CAN_CM;
406$WJ      [$LB8NonBreaks-$CM];
407
408     $CANT_CM $CM* $WJ;
409$CAN_CM  $CM* $WJ;
410
411# LB 12a
412#      [^SP BA HY] x GL
413#
414$GL $CM* [$LB8NonBreaks-[$CM $SP $BA $HH $HY]];
415
416# LB 12
417#     GL  x
418#
419$CANT_CM $CM* $GL;
420$CAN_CM $CM* $GL;
421
422
423# LB 13
424$CL $CM+ $CAN_CM;
425$CP $CM+ $CAN_CM;
426$EX $CM+ $CAN_CM;
427$IS $CM+ $CAN_CM;
428$SY $CM+ $CAN_CM;
429
430$CL [$LB8NonBreaks-$CM];
431$CP [$LB8NonBreaks-$CM];
432$EX [$LB8NonBreaks-$CM];
433$IS [$LB8NonBreaks-$CM];
434$SY [$LB8NonBreaks-$CM];
435
436
437# LB 14    OP SP* x
438#
439.   $SP* $CM* $OP;
440$AL_FOLLOW? $CM+ $SP+ $CM* $OP;     #  by LB 10, behaves like $AL_FOLLOW? $AL $SP+ $CM* $OP
441
442
443# LB 15
444$OP $SP* $CM* $QU;
445
446# LB 16
447$NS $SP* $CM* ($CL | $CP);
448
449# LB 17
450$B2 $SP* $CM* $B2;
451
452# LB 18  break after spaces
453#        Nothing explicit needed here.
454
455
456#
457# LB 19
458#
459$QU $CM* $CAN_CM;                                #   . x QU
460$QU      $LB18NonBreaks;
461
462
463$CAN_CM  $CM* $QU;                               #   QU x .
464     $CANT_CM $CM* $QU;
465
466#
467#  LB 20  Break before and after CB.
468#         nothing needed here.
469#
470
471# LB 20.09 added rule for Finnish tailoring
472$AL ($HY | $HH) / $SP;
473
474# LB 21
475($BA | $HH | $HY | $NS) $CM* [$LB20NonBreaks-$CM];     #  . x (BA | HY | NS)
476
477[$LB20NonBreaks-$CM] $CM* $BB;                   #  BB x .
478[^$CB] $CM* $BB;                                      #
479
480# LB21a
481[^$CB] $CM* ($HY | $BA | $HH) $CM* $HL;
482
483# LB21b (reverse)
484$HL $CM* $SY;
485
486# LB 22
487$IN $CM* ($ALPlus | $HL);
488$IN $CM* $EX;
489$IN $CM* ($ID | $EB | $EM);
490$IN $CM* $IN;
491$IN $CM* $NU;
492
493# LB 23
494$NU $CM* ($ALPlus | $HL);
495($ALPlus | $HL) $CM* $NU;
496
497# LB23a
498($ID | $EB | $EM) $CM* $PR;
499$PO $CM* ($ID | $EB | $EM);
500
501# LB 24
502($ALPlus | $HL) $CM* ($PR | $PO);
503($PR | $PO) $CM* ($ALPlus | $HL);
504
505
506# LB 25
507($CM* ($PR | $PO))? ($CM* ($CL | $CP))? ($CM* ($NU | $IS | $SY))* $CM* $NU ($CM* ($OP | $HY))? ($CM* ($PR | $PO))?;
508
509# LB 26
510($H3 | $H2 | $JV | $JL) $CM* $JL;
511($JT | $JV) $CM* ($H2 | $JV);
512$JT $CM* ($H3 | $JT);
513
514# LB 27
515$IN $CM* ($H3 | $H2 | $JT | $JV | $JL);
516$PO $CM* ($H3 | $H2 | $JT | $JV | $JL);
517 ($H3 | $H2 | $JT | $JV | $JL) $CM* $PR;
518
519# LB 28
520($ALPlus | $HL) $CM* ($ALPlus | $HL);
521
522
523# LB 29
524($ALPlus | $HL) $CM* $IS;
525
526# LB 30
527$OP $CM* ($ALPlus | $HL | $NU);
528($ALPlus | $HL | $NU) $CM* $CP;
529
530# LB 30a
531#    Pairs of Regional Indicators.
532#    The following two rules are nearly identical. The first matches only sequences with an odd number of adjacent RIs,
533#    the second with an even number. Stripping away the cruft they look like
534#         [^RI] RI / (RI RI)+ ^RI;
535#         [^RI] RI RI / (RI RI)+ ^RI;
536#
537[{bof} $NS $HY $BA $QU $CL $CP $EX $IS $SY $WJ $GL $ZW $SP $BK $CR $LF $NL $ZWJ] $CM* $RI / ($CM* $RI $CM* $RI)+ $CM* [{eof}[^$RI $CM]];
538[{bof} $NS $HY $BA $QU $CL $CP $EX $IS $SY $WJ $GL $ZW $SP $BK $CR $LF $NL $ZWJ] $CM* $RI $CM* $RI / ($CM* $RI $CM* $RI)+ $CM* [{eof}[^$RI $CM]];
539
540# In general, adjacent RIs stay together. The hard-break rules, above, overide this, forcing in the boundaries between pairs.
541$RI $CM* $RI;
542
543#    WJ, GL, QU, etc. are classes with rules like "WJ x "   which includes "WJ x RI".
544$RI $CM* ([$WJ $GL $QU $BB] |  (($HY | $BA)$CM* $HL));
545
546
547# LB 30b Do not break between an Emoji Base and an Emoji Modifier
548$EM $CM* $EB;
549
550
551## -------------------------------------------------
552
553!!safe_reverse;
554
555# LB 9
556^$CM+ [^$CM $BK $CR $LF $NL $ZW $SP];
557^$CM+ $SP / .;
558
559# LB 14
560$SP+ $CM* $OP;
561
562# LB 15
563$SP+ $CM* $QU;
564
565# LB 16
566$SP+ $CM* ($CL | $CP);
567
568# LB 17
569$SP+ $CM* $B2;
570
571# LB 21
572$CM* ($HY | $BA | $HH) $CM* $HL;
573
574# LB 25
575($CM* ($IS | $SY))+ $CM* $NU;
576($CL | $CP) $CM* ($NU | $IS | $SY);
577
578#  LB 30
579($CM* $RI)+;
580
581# For dictionary-based break
582$dictionary $dictionary;
583
584## -------------------------------------------------
585
586!!safe_forward;
587
588# Skip forward over all character classes that are involved in
589#   rules containing patterns with possibly more than one char
590#   of context.
591#
592#  It might be slightly more efficient to have specific rules
593#  instead of one generic one, but only if we could
594#  turn off rule chaining.  We don't want to move more
595#  than necessary.
596#
597^[$CM $OP $QU $CL $CP $B2 $PR $HY $BA $SP $RI $ZWJ $dictionary]+ [^$CM $OP $QU $CL $CP $B2 $PR $HY $BA $RI $ZWJ $dictionary];
598$dictionary $dictionary;
599
600