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2ca993e8 1# Copyright (c) 2002-2016 International Business Machines Corporation and
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2# others. All Rights Reserved.
3#
4# file: line_fi.txt
5#
6# Line Breaking Rules
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7# Implement default line breaking as defined by
8# Unicode Standard Annex #14 Revision 35 for Unicode 8.0
729e4ab9 9# http://www.unicode.org/reports/tr14/
08b89b0a 10# tailored as noted in 2nd paragraph below..
729e4ab9 11#
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12# Includes the Emoji breaking proposals from Unicode L2/16-011R3.
13# http://www.unicode.org/L2/L2016/16011r3-break-prop-emoji.pdf
14#
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15# TODO: Rule LB 8 remains as it was in Unicode 5.2
16# This is only because of a limitation of ICU break engine implementation,
17# not because the older behavior is desirable.
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18#
19# This tailors the line break behavior for Finnish, while otherwise behaving
20# per UAX 14 which corresponds to CSS line-break=strict (BCP47 -u-lb-strict).
21# It sets characters of class CJ to behave like NS.
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22
23#
24# Character Classes defined by TR 14.
25#
26
27!!chain;
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28
29!!lookAheadHardBreak;
30#
31# !!lookAheadHardBreak Described here because it is (as yet) undocumented elsewhere
32# and only used for the line break rules.
33#
34# It is used in the implementation of rule LB 10
35# which says to treat any combining mark that is not attached to a base
36# character as if it were of class AL (alphabetic).
37#
38# The problem occurs in the reverse rules.
39#
40# Consider a sequence like, with correct breaks as shown
41# LF ID CM AL AL
42# ^ ^ ^
43# Then consider the sequence without the initial ID (ideographic)
44# LF CM AL AL
45# ^ ^
46# Our CM, which in the first example was attached to the ideograph,
47# is now unattached, becomes an alpha, and joins in with the other
48# alphas.
49#
50# When iterating forwards, these sequences do not present any problems
51# When iterating backwards, we need to look ahead when encountering
52# a CM to see whether it attaches to something further on or not.
53# (Look-ahead in a reverse rule is looking towards the start)
54#
55# If the CM is unattached, we need to force a break.
56#
57# !!lookAheadHardBreak forces the run time state machine to
58# stop immediately when a look ahead rule ( '/' operator) matches,
59# and set the match position to that of the look-ahead operator,
60# no matter what other rules may be in play at the time.
61#
62# See rule LB 19 for an example.
63#
64
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65# Temporary definitions of Emoji Base and Emoji Modifiers, until properties are available.
66
a62d09fc 67$EB = [\u261D\u26F9\u270A-\u270D\U0001F385\U0001F3C2-\U0001F3C4\U0001F3C7\U0001F3CA-\U0001F3CC\U0001F442-\U0001F443\U0001F446-\U0001F450\U0001F466-\U0001F478\U0001F47C\U0001F481-\U0001F483\U0001F485-\U0001F487\U0001F4AA\U0001F574-\U0001F575\U0001F57A\U0001F590\U0001F595-\U0001F596\U0001F645-\U0001F647\U0001F64B-\U0001F64F\U0001F6A3\U0001F6B4-\U0001F6B6\U0001F6C0\U0001F6CC\U0001F918-\U0001F91E\U0001F926\U0001F930\U0001F933-\U0001F939\U0001F93C-\U0001F93E];
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68$EM = [\U0001F3FB-\U0001F3FF];
69
70$AI = [[:LineBreak = Ambiguous:] - [\u2640\u2642]];
a62d09fc 71$AL = [[:LineBreak = Alphabetic:] - [$EM\u2695\u2696\u2764]];
2ca993e8 72$BA = [:LineBreak = Break_After:];
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73$HH = [\u2010];
74$BB = [:LineBreak = Break_Before:];
75$BK = [:LineBreak = Mandatory_Break:];
76$B2 = [:LineBreak = Break_Both:];
77$CB = [:LineBreak = Contingent_Break:];
4388f060 78$CJ = [:LineBreak = Conditional_Japanese_Starter:];
729e4ab9 79$CL = [:LineBreak = Close_Punctuation:];
2ca993e8 80$CM = [[:LineBreak = Combining_Mark:] \u200d];
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81$CP = [:LineBreak = Close_Parenthesis:];
82$CR = [:LineBreak = Carriage_Return:];
83$EX = [:LineBreak = Exclamation:];
84$GL = [:LineBreak = Glue:];
4388f060 85$HL = [:LineBreak = Hebrew_Letter:];
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86$HY = [:LineBreak = Hyphen:];
87$H2 = [:LineBreak = H2:];
88$H3 = [:LineBreak = H3:];
a62d09fc 89$ID = [[:LineBreak = Ideographic:][\u2640\u2642\u2695\u2696\u2764] - $EB];
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90$IN = [:LineBreak = Inseperable:];
91$IS = [:LineBreak = Infix_Numeric:];
92$JL = [:LineBreak = JL:];
93$JV = [:LineBreak = JV:];
94$JT = [:LineBreak = JT:];
95$LF = [:LineBreak = Line_Feed:];
96$NL = [:LineBreak = Next_Line:];
4388f060 97$NS = [[:LineBreak = Nonstarter:] $CJ];
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98$NU = [:LineBreak = Numeric:];
99$OP = [:LineBreak = Open_Punctuation:];
100$PO = [:LineBreak = Postfix_Numeric:];
101$PR = [:LineBreak = Prefix_Numeric:];
102$QU = [:LineBreak = Quotation:];
51004dcb 103$RI = [:LineBreak = Regional_Indicator:];
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104$SA = [:LineBreak = Complex_Context:];
105$SG = [:LineBreak = Surrogate:];
106$SP = [:LineBreak = Space:];
107$SY = [:LineBreak = Break_Symbols:];
108$WJ = [:LineBreak = Word_Joiner:];
109$XX = [:LineBreak = Unknown:];
110$ZW = [:LineBreak = ZWSpace:];
2ca993e8 111$ZWJ = [\u200d];
08b89b0a 112
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113# Dictionary character set, for triggering language-based break engines. Currently
114# limited to LineBreak=Complex_Context. Note that this set only works in Unicode
115# 5.0 or later as the definition of Complex_Context was corrected to include all
116# characters requiring dictionary break.
117
118$dictionary = [:LineBreak = Complex_Context:];
119
120#
121# Rule LB1. By default, treat AI (characters with ambiguous east Asian width),
122# SA (South East Asian: Thai, Lao, Khmer)
123# SG (Unpaired Surrogates)
124# XX (Unknown, unassigned)
125# as $AL (Alphabetic)
126#
127$ALPlus = [$AL $AI $SA $SG $XX];
128
129#
130# Combining Marks. X $CM* behaves as if it were X. Rule LB6.
131#
132$ALcm = $ALPlus $CM*;
133$BAcm = $BA $CM*;
134$HHcm = $HH $CM*;
135$BBcm = $BB $CM*;
136$B2cm = $B2 $CM*;
137$CLcm = $CL $CM*;
138$CPcm = $CP $CM*;
139$EXcm = $EX $CM*;
140$GLcm = $GL $CM*;
4388f060 141$HLcm = $HL $CM*;
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142$HYcm = $HY $CM*;
143$H2cm = $H2 $CM*;
144$H3cm = $H3 $CM*;
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145$INcm = $IN $CM*;
146$IScm = $IS $CM*;
147$JLcm = $JL $CM*;
148$JVcm = $JV $CM*;
149$JTcm = $JT $CM*;
150$NScm = $NS $CM*;
151$NUcm = $NU $CM*;
152$OPcm = $OP $CM*;
153$POcm = $PO $CM*;
154$PRcm = $PR $CM*;
155$QUcm = $QU $CM*;
51004dcb 156$RIcm = $RI $CM*;
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157$SYcm = $SY $CM*;
158$WJcm = $WJ $CM*;
159
160## -------------------------------------------------
161
162!!forward;
163
164#
165# Each class of character can stand by itself as an unbroken token, with trailing combining stuff
166#
167$ALPlus $CM+;
168$BA $CM+;
169$HH $CM+;
170$BB $CM+;
171$B2 $CM+;
172$CL $CM+;
173$CP $CM+;
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174$EB $CM+;
175$EM $CM+;
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176$EX $CM+;
177$GL $CM+;
4388f060 178$HL $CM+;
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179$HY $CM+;
180$H2 $CM+;
181$H3 $CM+;
182$ID $CM+;
183$IN $CM+;
184$IS $CM+;
185$JL $CM+;
186$JV $CM+;
187$JT $CM+;
188$NS $CM+;
189$NU $CM+;
190$OP $CM+;
191$PO $CM+;
192$PR $CM+;
193$QU $CM+;
51004dcb 194$RI $CM+;
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195$SY $CM+;
196$WJ $CM+;
197
198#
199# CAN_CM is the set of characters that may combine with CM combining chars.
200# Note that Linebreak UAX 14's concept of a combining char and the rules
201# for what they can combine with are _very_ different from the rest of Unicode.
202#
203# Note that $CM itself is left out of this set. If CM is needed as a base
204# it must be listed separately in the rule.
205#
206$CAN_CM = [^$SP $BK $CR $LF $NL $ZW $CM]; # Bases that can take CMs
207$CANT_CM = [ $SP $BK $CR $LF $NL $ZW $CM]; # Bases that can't take CMs
208
209#
210# AL_FOLLOW set of chars that can unconditionally follow an AL
211# Needed in rules where stand-alone $CM s are treated as AL.
212# Chaining is disabled with CM because it causes other failures,
213# so for this one case we need to manually list out longer sequences.
214#
215$AL_FOLLOW_NOCM = [$BK $CR $LF $NL $ZW $SP];
4388f060 216$AL_FOLLOW_CM = [$CL $CP $EX $HL $IS $SY $WJ $GL $OP $QU $BA $HH $HY $NS $IN $NU $ALPlus];
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217$AL_FOLLOW = [$AL_FOLLOW_NOCM $AL_FOLLOW_CM];
218
219
220#
221# Rule LB 4, 5 Mandatory (Hard) breaks.
222#
223$LB4Breaks = [$BK $CR $LF $NL];
2ca993e8 224$LB4NonBreaks = [^$BK $CR $LF $NL $CM];
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225$CR $LF {100};
226
227#
228# LB 6 Do not break before hard line breaks.
229#
230$LB4NonBreaks? $LB4Breaks {100}; # LB 5 do not break before hard breaks.
231$CAN_CM $CM* $LB4Breaks {100};
2ca993e8 232^$CM+ $LB4Breaks {100};
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233
234# LB 7 x SP
235# x ZW
236$LB4NonBreaks [$SP $ZW];
237$CAN_CM $CM* [$SP $ZW];
2ca993e8 238^$CM+ [$SP $ZW];
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239
240#
241# LB 8 Break after zero width space
242# TODO: ZW SP* <break>
243# An engine change is required to write the reverse rule for this.
244# For now, leave the Unicode 5.2 rule, ZW <break>
245#
246$LB8Breaks = [$LB4Breaks $ZW];
247$LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]];
248
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249# LB 8a ZWJ x ID Emoji proposal.
250#
251$ZWJ ($ID | $EB | $EM);
729e4ab9 252
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253# LB 9 Combining marks. X $CM needs to behave like X, where X is not $SP, $BK $CR $LF $NL
254# $CM not covered by the above needs to behave like $AL
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255# See definition of $CAN_CM.
256
257$CAN_CM $CM+; # Stick together any combining sequences that don't match other rules.
2ca993e8 258^$CM+;
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259
260#
261# LB 11 Do not break before or after WORD JOINER & related characters.
262#
263$CAN_CM $CM* $WJcm;
264$LB8NonBreaks $WJcm;
2ca993e8 265^$CM+ $WJcm;
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266
267$WJcm $CANT_CM;
268$WJcm $CAN_CM $CM*;
269
270#
271# LB 12 Do not break after NBSP and related characters.
272# GL x
273#
274$GLcm $CAN_CM $CM*;
275$GLcm $CANT_CM;
2ca993e8 276
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277#
278# LB 12a Do not break before NBSP and related characters ...
279# [^SP BA HY] x GL
280#
281[[$LB8NonBreaks] - [$SP $BA $HH $HY]] $CM* $GLcm;
2ca993e8 282^$CM+ $GLcm;
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283
284
285
286#
287# LB 13 Don't break before ']' or '!' or ';' or '/', even after spaces.
288#
289$LB8NonBreaks $CL;
290$CAN_CM $CM* $CL;
2ca993e8 291^$CM+ $CL; # by rule 10, stand-alone CM behaves as AL
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292
293$LB8NonBreaks $CP;
294$CAN_CM $CM* $CP;
2ca993e8 295^$CM+ $CP; # by rule 10, stand-alone CM behaves as AL
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296
297$LB8NonBreaks $EX;
298$CAN_CM $CM* $EX;
2ca993e8 299^$CM+ $EX; # by rule 10, stand-alone CM behaves as AL
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300
301$LB8NonBreaks $IS;
302$CAN_CM $CM* $IS;
2ca993e8 303^$CM+ $IS; # by rule 10, stand-alone CM behaves as AL
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304
305$LB8NonBreaks $SY;
306$CAN_CM $CM* $SY;
2ca993e8 307^$CM+ $SY; # by rule 10, stand-alone CM behaves as AL
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308
309
310#
311# LB 14 Do not break after OP, even after spaces
312#
313$OPcm $SP* $CAN_CM $CM*;
314$OPcm $SP* $CANT_CM;
315
316$OPcm $SP+ $CM+ $AL_FOLLOW?; # by rule 10, stand-alone CM behaves as AL
317
318# LB 15
319$QUcm $SP* $OPcm;
320
321# LB 16
322($CLcm | $CPcm) $SP* $NScm;
323
324# LB 17
325$B2cm $SP* $B2cm;
326
327#
328# LB 18 Break after spaces.
329#
330$LB18NonBreaks = [$LB8NonBreaks - [$SP]];
331$LB18Breaks = [$LB8Breaks $SP];
332
333
334# LB 19
335# x QU
336$LB18NonBreaks $CM* $QUcm;
2ca993e8 337^$CM+ $QUcm;
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338
339# QU x
340$QUcm .?;
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341
342
343# LB 20
344# <break> $CB
345# $CB <break>
346
347$LB20NonBreaks = [$LB18NonBreaks - $CB];
348
349# LB 20.09 added rule for Finnish tailoring
350# LB 21 x (BA | HY | NS)
351# BB x
352#
353$LB20NonBreaks $CM* ($BAcm | $HHcm | $HYcm | $NScm) / $AL;
354$LB20NonBreaks $CM* ($BAcm | $HHcm | $HYcm | $NScm);
355($HY | $HH) $AL;
2ca993e8 356^$CM+ ($BAcm | $HYcm | $HHcm | $NScm);
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357
358$BBcm [^$CB]; # $BB x
359$BBcm $LB20NonBreaks $CM*;
360
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361# LB 21a Don't break after Hebrew + Hyphen
362# HL (HY | BA) x
363#
364$HLcm ($HYcm | $BAcm | $HHcm) [^$CB]?;
365
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366# LB 21b (forward) Don't break between SY and HL
367# (break between HL and SY already disallowed by LB 13 above)
368$SYcm $HLcm;
369
729e4ab9 370# LB 22
4388f060 371($ALcm | $HLcm) $INcm;
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372^$CM+ $INcm; # by rule 10, any otherwise unattached CM behaves as AL
373$EXcm $INcm;
374($ID | $EB | $EM) $CM* $INcm;
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375$INcm $INcm;
376$NUcm $INcm;
377
378
379# $LB 23
2ca993e8 380($ID | $EB | $EM) $CM* $POcm;
729e4ab9 381$ALcm $NUcm; # includes $LB19
4388f060 382$HLcm $NUcm;
2ca993e8 383^$CM+ $NUcm; # Rule 10, any otherwise unattached CM behaves as AL
729e4ab9 384$NUcm $ALcm;
4388f060 385$NUcm $HLcm;
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386
387#
388# LB 24
389#
2ca993e8 390$PRcm ($ID | $EB | $EM);
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391$PRcm ($ALcm | $HLcm);
392$POcm ($ALcm | $HLcm);
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393($ALcm | $HLcm) ($PRcm | $POcm);
394^$CM+ ($PRcm | $POcm); # Rule 10, any otherwise unattached CM behaves as AL
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395
396#
397# LB 25 Numbers.
398#
399($PRcm | $POcm)? ($OPcm | $HYcm)? $NUcm ($NUcm | $SYcm | $IScm)* ($CLcm | $CPcm)? ($PRcm | $POcm)?;
400
401# LB 26 Do not break a Korean syllable
402#
403$JLcm ($JLcm | $JVcm | $H2cm | $H3cm);
404($JVcm | $H2cm) ($JVcm | $JTcm);
405($JTcm | $H3cm) $JTcm;
406
407# LB 27 Treat korean Syllable Block the same as ID (don't break it)
408($JLcm | $JVcm | $JTcm | $H2cm | $H3cm) $INcm;
409($JLcm | $JVcm | $JTcm | $H2cm | $H3cm) $POcm;
410$PRcm ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm);
411
412
413# LB 28 Do not break between alphabetics
414#
4388f060 415($ALcm | $HLcm) ($ALcm | $HLcm);
2ca993e8 416^$CM+ ($ALcm | $HLcm); # The $CM+ is from rule 10, an unattached CM is treated as AL
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417
418# LB 29
4388f060 419$IScm ($ALcm | $HLcm);
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420
421# LB 30
4388f060 422($ALcm | $HLcm | $NUcm) $OPcm;
2ca993e8 423^$CM+ $OPcm; # The $CM+ is from rule 10, an unattached CM is treated as AL.
4388f060 424$CPcm ($ALcm | $HLcm | $NUcm);
729e4ab9 425
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426# LB 30a Do not break between regional indicators. Break after pairs of them.
427# Tricky interaction with LB8a: ZWJ x ID
428$RIcm $RI / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM] {eof}];
429$RIcm $RI $CM* $ZWJ / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM $ID $EB $EM] {eof}];
430$RIcm $RI $CM* [$CM-$ZWJ] / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM] {eof}];
431
432$RIcm $RIcm [$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS {eof}];
433$RIcm $RIcm $ZWJ ($ID | $EB | $EM);
729e4ab9 434
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435# LB 30b Do not break between an Emoji Base and an Emoji Modifier
436$EB $CM* $EM;
08b89b0a 437
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438#
439# Reverse Rules.
440#
441## -------------------------------------------------
442
443!!reverse;
444
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445^$CM+ $ALPlus;
446^$CM+ $BA;
447^$CM+ $HH;
448^$CM+ $BB;
449^$CM+ $B2;
450^$CM+ $CL;
451^$CM+ $CP;
452^$CM+ $EB;
453^$CM+ $EM;
454^$CM+ $EX;
455^$CM+ $GL;
456^$CM+ $HL;
457^$CM+ $HY;
458^$CM+ $H2;
459^$CM+ $H3;
460^$CM+ $ID;
461^$CM+ $IN;
462^$CM+ $IS;
463^$CM+ $JL;
464^$CM+ $JV;
465^$CM+ $JT;
466^$CM+ $NS;
467^$CM+ $NU;
468^$CM+ $OP;
469^$CM+ $PO;
470^$CM+ $PR;
471^$CM+ $QU;
472^$CM+ $RI;
473^$CM+ $SY;
474^$CM+ $WJ;
475^$CM+;
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476
477
478#
479# Sequences of the form (shown forwards)
480# [CANT_CM] <break> [CM] [whatever]
481# The CM needs to behave as an AL
482#
483$AL_FOLLOW $CM+ / (
484 [$BK $CR $LF $NL $ZW {eof}] |
485 $SP+ $CM+ $SP |
486 $SP+ $CM* ([^$OP $CM $SP] | [$AL {eof}])); # if LB 14 will match, need to surpress this break.
2ca993e8 487 # LB14 says OP SP* x .
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488 # becomes OP SP* x AL
489 # becomes OP SP* x CM+ AL_FOLLOW
490 #
491 # Further note: the $AL in [$AL {eof}] is only to work around
492 # a rule compiler bug which complains about
493 # empty sets otherwise.
2ca993e8 494
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495#
496# Sequences of the form (shown forwards)
497# [CANT_CM] <break> [CM] <break> [PR]
498# The CM needs to behave as an AL
499# This rule is concerned about getting the second of the two <breaks> in place.
500#
501
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502# Apple early addition, remove this, superseded by LB24
503# [$PR ] / $CM+ [$BK $CR $LF $NL $ZW $SP {eof}];
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504
505
506
2ca993e8 507# LB 4, 5, 6
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508
509$LB4Breaks [$LB4NonBreaks-$CM];
510$LB4Breaks $CM+ $CAN_CM;
511$LF $CR;
512
513
514# LB 7 x SP
515# x ZW
516[$SP $ZW] [$LB4NonBreaks-$CM];
517[$SP $ZW] $CM+ $CAN_CM;
518
519# LB 8 ZW SP* <break>
520# TODO: to implement this, we need more than one look-ahead hard break in play at a time.
521# Requires an engine enhancement.
522# / $SP* $ZW
523
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524# LB 8a ZWJ x ID Unicode Emoji proposal L2/16-011R3
525# The ZWJ will look like a CM to whatever precedes it.
526#
527($ID | $EB | $EM) $ZWJ $CM* $CAN_CM?;
528
08b89b0a 529
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530# LB 9,10 Combining marks.
531# X $CM needs to behave like X, where X is not $SP or controls.
532# $CM not covered by the above needs to behave like $AL
533# Stick together any combining sequences that don't match other rules.
2ca993e8 534^$CM+ $CAN_CM;
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535
536
537# LB 11
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538#
539$WJ $CM* $CAN_CM;
540$WJ [$LB8NonBreaks-$CM];
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541
542 $CANT_CM $CM* $WJ;
2ca993e8 543$CAN_CM $CM* $WJ;
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544
545# LB 12a
546# [^SP BA HY] x GL
547#
2ca993e8 548$GL $CM* [$LB8NonBreaks-[$CM $SP $BA $HH $HY]];
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549
550# LB 12
551# GL x
552#
553$CANT_CM $CM* $GL;
2ca993e8 554$CAN_CM $CM* $GL;
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555
556
557# LB 13
558$CL $CM+ $CAN_CM;
559$CP $CM+ $CAN_CM;
560$EX $CM+ $CAN_CM;
561$IS $CM+ $CAN_CM;
562$SY $CM+ $CAN_CM;
563
564$CL [$LB8NonBreaks-$CM];
565$CP [$LB8NonBreaks-$CM];
566$EX [$LB8NonBreaks-$CM];
567$IS [$LB8NonBreaks-$CM];
568$SY [$LB8NonBreaks-$CM];
569
570# Rule 13 & 14 taken together for an edge case.
571# Match this, shown forward
572# OP SP+ ($CM+ behaving as $AL) (CL | CP | EX | IS | IY)
573# This really wants to chain at the $CM+ (which is acting as an $AL)
574# except for $CM chaining being disabled.
2ca993e8 575[$CL $CP $EX $IS $SY] $CM+ $SP+ $CM* $OP;
729e4ab9
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576
577# LB 14 OP SP* x
578#
2ca993e8 579$CAN_CM $SP* $CM* $OP;
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580 $CANT_CM $SP* $CM* $OP;
581$AL_FOLLOW? $CM+ $SP $SP* $CM* $OP; # by LB 10, behaves like $AL_FOLLOW? $AL $SP* $CM* $OP
729e4ab9 582
2ca993e8
A
583 $AL_FOLLOW_NOCM $CM+ $SP+ $CM* $OP;
584$AL_FOLLOW_CM $CM+ $SP+ $CM* $OP;
729e4ab9
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585
586
587# LB 15
2ca993e8 588$OP $SP* $CM* $QU;
729e4ab9
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589
590# LB 16
2ca993e8 591$NS $SP* $CM* ($CL | $CP);
729e4ab9
A
592
593# LB 17
2ca993e8 594$B2 $SP* $CM* $B2;
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595
596# LB 18 break after spaces
597# Nothing explicit needed here.
598
599
600#
601# LB 19
602#
2ca993e8
A
603$QU $CM* $CAN_CM; # . x QU
604$QU $LB18NonBreaks;
729e4ab9
A
605
606
2ca993e8 607$CAN_CM $CM* $QU; # QU x .
729e4ab9 608 $CANT_CM $CM* $QU;
2ca993e8 609
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610#
611# LB 20 Break before and after CB.
612# nothing needed here.
613#
614
615# LB 20.09 added rule for Finnish tailoring
616$AL ($HY | $HH) / $SP;
617
618# LB 21
2ca993e8 619($BA | $HH | $HY | $NS) $CM* [$LB20NonBreaks-$CM]; # . x (BA | HY | NS)
729e4ab9 620
2ca993e8
A
621[$LB20NonBreaks-$CM] $CM* $BB; # BB x .
622[^$CB] $CM* $BB; #
729e4ab9 623
4388f060
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624# LB21a
625[^$CB] $CM* ($HY | $BA | $HH) $CM* $HL;
729e4ab9 626
57a6839d 627# LB21b (reverse)
2ca993e8 628$HL $CM* $SY;
729e4ab9
A
629
630# LB 22
2ca993e8
A
631$IN $CM* ($ALPlus | $HL);
632$IN $CM* $EX;
633$IN $CM* ($ID | $EB | $EM);
634$IN $CM* $IN;
635$IN $CM* $NU;
729e4ab9
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636
637# LB 23
2ca993e8
A
638$PO $CM* ($ID | $EB | $EM);
639$NU $CM* ($ALPlus | $HL);
640($ALPlus | $HL) $CM* $NU;
729e4ab9
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641
642# LB 24
2ca993e8
A
643($ID | $EB | $EM) $CM* $PR;
644($ALPlus | $HL) $CM* $PR;
645($ALPlus | $HL) $CM* $PO;
646$CM* ($PR | $PO) $CM* ($ALPlus | $HL);
647$CM* ($PR | $PO) $CM+ / [$BK $CR $LF $NL $ZW $SP {eof}];
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648
649# LB 25
650($CM* ($PR | $PO))? ($CM* ($CL | $CP))? ($CM* ($NU | $IS | $SY))* $CM* $NU ($CM* ($OP | $HY))? ($CM* ($PR | $PO))?;
651
652# LB 26
2ca993e8
A
653($H3 | $H2 | $JV | $JL) $CM* $JL;
654($JT | $JV) $CM* ($H2 | $JV);
655$JT $CM* ($H3 | $JT);
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656
657# LB 27
2ca993e8
A
658$IN $CM* ($H3 | $H2 | $JT | $JV | $JL);
659$PO $CM* ($H3 | $H2 | $JT | $JV | $JL);
660 ($H3 | $H2 | $JT | $JV | $JL) $CM* $PR;
729e4ab9
A
661
662# LB 28
2ca993e8 663($ALPlus | $HL) $CM* ($ALPlus | $HL);
729e4ab9
A
664
665
666# LB 29
2ca993e8 667($ALPlus | $HL) $CM* $IS;
729e4ab9
A
668
669# LB 30
2ca993e8
A
670$OP $CM* ($ALPlus | $HL | $NU);
671($ALPlus | $HL | $NU) $CM* $CP;
729e4ab9 672
51004dcb 673# LB 30a
2ca993e8
A
674# Pairs of Regional Indicators.
675# The following two rules are nearly identical. The first matches only sequences with an odd number of adjacent RIs,
676# the second with an even number. Stripping away the cruft they look like
677# [^RI] RI / (RI RI)+ ^RI;
678# [^RI] RI RI / (RI RI)+ ^RI;
679#
680[{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]];
681[{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 $CM]];
682
683# In general, adjacent RIs stay together. The hard-break rules, above, overide this, forcing in the boundaries between pairs.
684$RI $CM* $RI;
685
686# WJ, GL, QU, etc. are classes with rules like "WJ x " which includes "WJ x RI".
687$RI $CM* ([$WJ $GL $QU $BB] | (($HY | $BA)$CM* $HL));
688
689
690# LB 30b Do not break between an Emoji Base and an Emoji Modifier
691$EM $CM* $EB;
729e4ab9 692
08b89b0a 693
729e4ab9
A
694## -------------------------------------------------
695
696!!safe_reverse;
697
698# LB 9
2ca993e8
A
699^$CM+ [^$CM $BK $CR $LF $NL $ZW $SP];
700^$CM+ $SP / .;
729e4ab9
A
701
702# LB 14
703$SP+ $CM* $OP;
704
705# LB 15
706$SP+ $CM* $QU;
707
708# LB 16
709$SP+ $CM* ($CL | $CP);
710
711# LB 17
712$SP+ $CM* $B2;
713
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714# LB 21
715$CM* ($HY | $BA | $HH) $CM* $HL;
716
729e4ab9
A
717# LB 25
718($CM* ($IS | $SY))+ $CM* $NU;
719($CL | $CP) $CM* ($NU | $IS | $SY);
720
2ca993e8
A
721# LB 30
722($CM* $RI)+;
723
729e4ab9
A
724# For dictionary-based break
725$dictionary $dictionary;
726
727## -------------------------------------------------
728
729!!safe_forward;
730
731# Skip forward over all character classes that are involved in
732# rules containing patterns with possibly more than one char
733# of context.
734#
735# It might be slightly more efficient to have specific rules
736# instead of one generic one, but only if we could
737# turn off rule chaining. We don't want to move more
738# than necessary.
739#
2ca993e8 740^[$CM $OP $QU $CL $CP $B2 $PR $HY $BA $SP $RI $ZWJ $dictionary]+ [^$CM $OP $QU $CL $CP $B2 $PR $HY $BA $RI $ZWJ $dictionary];
729e4ab9
A
741$dictionary $dictionary;
742