[apple/icu.git] / icuSources / test / testdata / break_rules / line_normal.txt

#
# Copyright (C) 2016 and later: Unicode, Inc. and others.
# License & terms of use: http://www.unicode.org/copyright.html
# Copyright (c) 2016, International Business Machines Corporation and others. All Rights Reserved.
#
# file: line_normal.txt
#
# Reference Line Break rules for intltest rbbi/RBBIMonkeyTest
#
# Note: Rule syntax and the monkey test itself are still a work in progress.
#       They are expected to change with review and the addition of support for rule tailoring.
#
#         Line Breaking Rules
#         Implement default line breaking as defined by
#         Unicode Standard Annex #14 Revision 34 for Unicode 8.0
#         http://www.unicode.org/reports/tr14/
#         tailored as noted in 2nd paragraph below.
#
#         TODO:  Rule LB 8 remains as it was in Unicode 5.2
#         This is only because of a limitation of ICU break engine implementation,
#         not because the older behavior is desirable.
#
#         This tailors the line break behavior to correspond to CSS
#         line-break=normal (BCP47 -u-lb-normal) as defined for languages other than
#         Chinese & Japanese.
#         It sets characters of class CJ to behave like ID.


type = line;
locale = en@lb=normal;

AI = [:LineBreak =  Ambiguous:];
AL = [:LineBreak =  Alphabetic:];
BA = [:LineBreak =  Break_After:];
BB = [:LineBreak =  Break_Before:];
BK = [:LineBreak =  Mandatory_Break:];
B2 = [:LineBreak =  Break_Both:];
CB = [:LineBreak =  Contingent_Break:];
CJ = [:LineBreak =  Conditional_Japanese_Starter:];
CL = [:LineBreak =  Close_Punctuation:];
CM = [:LineBreak =  Combining_Mark:];
CP = [:LineBreak =  Close_Parenthesis:];
CR = [:LineBreak =  Carriage_Return:];
EB = [[:LineBreak =  EB:] \U0001F46A-\U0001F46D\U0001F46F\U0001F91D\U0001F93C];
EM = [:LineBreak =  EM:];
EX = [:LineBreak =  Exclamation:];
GL = [:LineBreak =  Glue:];
HL = [:LineBreak =  Hebrew_Letter:];
HY = [:LineBreak =  Hyphen:];
H2 = [:LineBreak =  H2:];
H3 = [:LineBreak =  H3:];
ID = [[:LineBreak =  Ideographic:] CJ];  # CSS Normal tailoring: CJ resolves to ID
IN = [:LineBreak =  Inseperable:];
IS = [:LineBreak =  Infix_Numeric:];
JL = [:LineBreak =  JL:];
JV = [:LineBreak =  JV:];
JT = [:LineBreak =  JT:];
LF = [:LineBreak =  Line_Feed:];
NL = [:LineBreak =  Next_Line:];
NS = [:LineBreak =  Nonstarter:];
NU = [:LineBreak =  Numeric:];
OP = [:LineBreak =  Open_Punctuation:];
PO = [:LineBreak =  Postfix_Numeric:];
PR = [:LineBreak =  Prefix_Numeric:];
QU = [:LineBreak =  Quotation:];
RI = [:LineBreak =  Regional_Indicator:];
SA = [:LineBreak =  Complex_Context:];
SG = [:LineBreak =  Surrogate:];
SP = [:LineBreak =  Space:];
SY = [:LineBreak =  Break_Symbols:];
WJ = [:LineBreak =  Word_Joiner:];
XX = [:LineBreak =  Unknown:];
ZW = [:LineBreak =  ZWSpace:];
ZWJ = [:LineBreak =  ZWJ:];

EmojiNRK = [[\p{Emoji}] - [[RI]\u002a\u00230-9©®™〰〽]];
# Data for Extended Pictographic scraped from CLDR common/properties/ExtendedPictographic.txt, r13267
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];

# LB1 - Resolve AI, CB, CJ, SA, SG, and XX into other line breaking classes
AL = [AL AI SG XX ];
dictionary = SA;

# By LB9, a ZWJ also behaves as a CM. Including it in the definition of CM avoids having to explicitly
#         list it in the numerous rules that use CM.
CM = [CM ZWJ];

LB4:        BK ÷;
LB5:        CR LF;
LB5.1:      CR ÷;
LB5.2:      LF ÷;
LB5.3:      NL ÷;

LB6:        . (BK | CR | LF | NL);
LB6.1:      [^BK CR LF NL SP ZW] CM* (BK | CR | LF | NL);

# Rules LB14 - LB17.
# Moved before LB7, because they can match a longer sequence that would also match LB7,
# for example, the sequence "OP CM SP AL" matches LB14 while the prefix of it,
#                           "while only the prefix "OP CM SP" matches LB7.1
LB14:        OP CM* SP* .;
LB15:        QU CM* SP* OP;
LB16:        (CL | CP)CM* SP* NS;
LB17:        B2 CM* SP* B2;

LB7.1:      [^ZW SP] CM* [SP ZW];
LB7.2:      [ZW SP] [SP ZW];

# LB8, ICU differs from UAX-14,
#    ICU:    ZW ÷;
#    UAX 14: ZW SP* ÷;
LB8:        ZW ÷;

# LB8a
#      ZWJ x (ID | Extended_Pict | EmojiNRK)
LB8a:       ZWJ (ID | Extended_Pict | EmojiNRK);


# LB9:  X CM -> X
# LB10: Unattached CM -> AL

#LB11:       × WJ;
#            WJ ×

LB11.1:      [^BK CR LF NL SP ZW] CM* WJ;
LB11.2:      SP WJ;
LB11.3:      WJ CM* [^CM];

LB12:        GL CM* [^CM];

LB12a:       [^SP BA HY] CM* GL;

# LB 13 ICU Tailoring, matches tailoring exmaple 8 from UAX 14.
#
#   LB13.1   [^SP] CM* [CL CP EX IS SY]    # original UAX 14 rule.
#   LB13.2   SP    CM* [CL CP EX IS SY]

LB13.1: [^NU SP] CM* [CL CP IS SY];
LB13.2: [^SP] CM* EX;
LB13.2: SP [CL CP EX IS SY];


# LB 14-17 are moved above LB 7.

LB18:        SP ÷;

LB19:        . CM* QU;
LB19.1:      QU CM* [^CM];

# LB 20   Break before and after CB.
#         Interaction with LB8a:  ZWJ x ID is tricky because CM includes ZWJ.
#                                 ZWJ acts like a CM to the left, combining with CB.
#                                 ZWJ acts independently to the right, no break from ID by LB8a.
LB20:        . CM* ÷ CB;
LB20.1a:     CB CM* ZWJ (ID | Extended_Pict | EmojiNRK);
LB20.1b:      CB CM* ÷;

# Note: Rule 21a must come before 21 to prevent 21.1 from matching HL BA, then
#       not picking up the continuing match after the BA from 21a.
LB21a:       HL CM* (HY | BA) CM* [^CM CB];

LB21.1:      . CM* [BA HY NS];
LB21.2:      BB CM* [^CM CB];

LB21b:       SY CM* HL;

LB22.1:        (AL | HL | CM) CM* IN;   # The CM is from LB10, treat an unattached CM as AL.
LB22.2:       EX CM* IN;
LB22.3:       (ID | EB | EM) CM* IN;
LB22.4:       IN CM* IN;
LB22.5:       NU CM* IN;

LB23.1:      (AL | HL | CM) CM* NU;
LB23.2:      NU CM* (AL | HL);

LB23a.1:     PR CM* (ID | EB | EM);
LB23a.2:     (ID | EB | EM) CM* PO;

LB24.2:      (PR | PO) CM* (AL | HL);
LB24.3:      (AL | HL | CM) CM* (PR | PO);

# Numbers. Equivalent to Tailoring example 8 from UAx 14.
LB25:        ((PR | PO)CM*)? ((OP | HY)CM*)? NU (CM*(NU | SY | IS))* (CM*(CL | CP))? (CM*(PR | PO))?;

LB26.1:      JL CM* (JL | JV | H2 | H3);
LB26.2:      (JV | H2) CM* (JV | JT);
LB26.3:      (JT | H3) CM* JT;

LB27.1:      (JL | JV | JT | H2 | H3) CM* IN;
LB27.2:      (JL | JV | JT | H2 | H3) CM* PO;
LB27.3:      PR CM* (JL | JV | JT | H2 | H3);

# LB28 Do not break between Alphabetics.
#      Unattached (leading) CM treated as AL.
LB28:        (AL | HL | CM)CM* (AL | HL);

LB29:        IS CM* (AL | HL);

# LB30  is adjusted for unattached leading CM being treated as AL.
LB30.1:      (AL | CM | HL | NU) CM* OP;
LB30.2:      CP CM* (AL | HL | NU);

# LB31  keep pairs of RI together.
LB30a.1:     RI CM* RI CM* [BK CR LF NL SP ZW WJ GL CL CP EX IS SY QU BA HY NS];
LB30a.2:     RI CM* RI CM* ZWJ (ID | Extended_Pict | EmojiNRK);
LB30a.3:     RI CM* RI CM* ÷;

# LB30b Do not break between Emoji Base and Emoji Modifier
LB30b:       EB CM* EM;

# LB31 Break Everywhere Else.
#      Include combining marks
LB31.1:        . CM* ZWJ (ID | Extended_Pict | EmojiNRK);
LB31.2:        . CM* ÷;
Commit	Line	Data
2ca993e8	1	#
f3c0d7a5 A	2	# Copyright (C) 2016 and later: Unicode, Inc. and others.
f3c0d7a5 A	3	# License & terms of use: http://www.unicode.org/copyright.html
2ca993e8 A	4	# Copyright (c) 2016, International Business Machines Corporation and others. All Rights Reserved.
	5	#
	6	# file: line_normal.txt
	7	#
	8	# Reference Line Break rules for intltest rbbi/RBBIMonkeyTest
	9	#
	10	# Note: Rule syntax and the monkey test itself are still a work in progress.
	11	# They are expected to change with review and the addition of support for rule tailoring.
	12	#
	13	# Line Breaking Rules
f3c0d7a5	14	# Implement default line breaking as defined by
2ca993e8 A	15	# Unicode Standard Annex #14 Revision 34 for Unicode 8.0
2ca993e8 A	16	# http://www.unicode.org/reports/tr14/
f3c0d7a5	17	# tailored as noted in 2nd paragraph below.
2ca993e8 A	18	#
	19	# TODO: Rule LB 8 remains as it was in Unicode 5.2
	20	# This is only because of a limitation of ICU break engine implementation,
	21	# not because the older behavior is desirable.
	22	#
	23	# This tailors the line break behavior to correspond to CSS
f3c0d7a5	24	# line-break=normal (BCP47 -u-lb-normal) as defined for languages other than
2ca993e8 A	25	# Chinese & Japanese.
	26	# It sets characters of class CJ to behave like ID.
	27
	28
	29	type = line;
	30	locale = en@lb=normal;
	31
f3c0d7a5 A	32	AI = [:LineBreak = Ambiguous:];
f3c0d7a5 A	33	AL = [:LineBreak = Alphabetic:];
2ca993e8 A	34	BA = [:LineBreak = Break_After:];
	35	BB = [:LineBreak = Break_Before:];
	36	BK = [:LineBreak = Mandatory_Break:];
	37	B2 = [:LineBreak = Break_Both:];
	38	CB = [:LineBreak = Contingent_Break:];
	39	CJ = [:LineBreak = Conditional_Japanese_Starter:];
	40	CL = [:LineBreak = Close_Punctuation:];
f3c0d7a5	41	CM = [:LineBreak = Combining_Mark:];
2ca993e8 A	42	CP = [:LineBreak = Close_Parenthesis:];
2ca993e8 A	43	CR = [:LineBreak = Carriage_Return:];
f3c0d7a5 A	44	EB = [[:LineBreak = EB:] \U0001F46A-\U0001F46D\U0001F46F\U0001F91D\U0001F93C];
f3c0d7a5 A	45	EM = [:LineBreak = EM:];
2ca993e8 A	46	EX = [:LineBreak = Exclamation:];
	47	GL = [:LineBreak = Glue:];
	48	HL = [:LineBreak = Hebrew_Letter:];
	49	HY = [:LineBreak = Hyphen:];
	50	H2 = [:LineBreak = H2:];
	51	H3 = [:LineBreak = H3:];
f3c0d7a5	52	ID = [[:LineBreak = Ideographic:] CJ]; # CSS Normal tailoring: CJ resolves to ID
2ca993e8 A	53	IN = [:LineBreak = Inseperable:];
	54	IS = [:LineBreak = Infix_Numeric:];
	55	JL = [:LineBreak = JL:];
	56	JV = [:LineBreak = JV:];
	57	JT = [:LineBreak = JT:];
	58	LF = [:LineBreak = Line_Feed:];
	59	NL = [:LineBreak = Next_Line:];
	60	NS = [:LineBreak = Nonstarter:];
	61	NU = [:LineBreak = Numeric:];
	62	OP = [:LineBreak = Open_Punctuation:];
	63	PO = [:LineBreak = Postfix_Numeric:];
	64	PR = [:LineBreak = Prefix_Numeric:];
	65	QU = [:LineBreak = Quotation:];
	66	RI = [:LineBreak = Regional_Indicator:];
	67	SA = [:LineBreak = Complex_Context:];
	68	SG = [:LineBreak = Surrogate:];
	69	SP = [:LineBreak = Space:];
	70	SY = [:LineBreak = Break_Symbols:];
	71	WJ = [:LineBreak = Word_Joiner:];
	72	XX = [:LineBreak = Unknown:];
	73	ZW = [:LineBreak = ZWSpace:];
f3c0d7a5	74	ZWJ = [:LineBreak = ZWJ:];
2ca993e8	75
f3c0d7a5 A	76	EmojiNRK = [[\p{Emoji}] - [[RI]\u002a\u00230-9©®™〰〽]];
	77	# Data for Extended Pictographic scraped from CLDR common/properties/ExtendedPictographic.txt, r13267
	78	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];
2ca993e8	79
f3c0d7a5 A	80	# LB1 - Resolve AI, CB, CJ, SA, SG, and XX into other line breaking classes
	81	AL = [AL AI SG XX ];
	82	dictionary = SA;
2ca993e8	83
f3c0d7a5 A	84	# By LB9, a ZWJ also behaves as a CM. Including it in the definition of CM avoids having to explicitly
	85	# list it in the numerous rules that use CM.
	86	CM = [CM ZWJ];
2ca993e8 A	87
	88	LB4: BK ÷;
	89	LB5: CR LF;
	90	LB5.1: CR ÷;
	91	LB5.2: LF ÷;
	92	LB5.3: NL ÷;
	93
	94	LB6: . (BK \| CR \| LF \| NL);
	95	LB6.1: [^BK CR LF NL SP ZW] CM* (BK \| CR \| LF \| NL);
	96
	97	# Rules LB14 - LB17.
	98	# Moved before LB7, because they can match a longer sequence that would also match LB7,
	99	# for example, the sequence "OP CM SP AL" matches LB14 while the prefix of it,
	100	# "while only the prefix "OP CM SP" matches LB7.1
	101	LB14: OP CM* SP* .;
	102	LB15: QU CM* SP* OP;
	103	LB16: (CL \| CP)CM* SP* NS;
	104	LB17: B2 CM* SP* B2;
	105
	106	LB7.1: [^ZW SP] CM* [SP ZW];
	107	LB7.2: [ZW SP] [SP ZW];
	108
	109	# LB8, ICU differs from UAX-14,
	110	# ICU: ZW ÷;
	111	# UAX 14: ZW SP* ÷;
	112	LB8: ZW ÷;
	113
f3c0d7a5 A	114	# LB8a
	115	# ZWJ x (ID \| Extended_Pict \| EmojiNRK)
	116	LB8a: ZWJ (ID \| Extended_Pict \| EmojiNRK);
2ca993e8 A	117
	118
	119	# LB9: X CM -> X
	120	# LB10: Unattached CM -> AL
	121
	122	#LB11: × WJ;
	123	# WJ ×
	124
	125	LB11.1: [^BK CR LF NL SP ZW] CM* WJ;
	126	LB11.2: SP WJ;
	127	LB11.3: WJ CM* [^CM];
	128
	129	LB12: GL CM* [^CM];
	130
	131	LB12a: [^SP BA HY] CM* GL;
	132
	133	# LB 13 ICU Tailoring, matches tailoring exmaple 8 from UAX 14.
	134	#
	135	# LB13.1 [^SP] CM* [CL CP EX IS SY] # original UAX 14 rule.
	136	# LB13.2 SP CM* [CL CP EX IS SY]
	137
	138	LB13.1: [^NU SP] CM* [CL CP IS SY];
	139	LB13.2: [^SP] CM* EX;
	140	LB13.2: SP [CL CP EX IS SY];
	141
	142
	143	# LB 14-17 are moved above LB 7.
	144
	145	LB18: SP ÷;
	146
	147	LB19: . CM* QU;
	148	LB19.1: QU CM* [^CM];
	149
	150	# LB 20 Break before and after CB.
f3c0d7a5 A	151	# Interaction with LB8a: ZWJ x ID is tricky because CM includes ZWJ.
	152	# ZWJ acts like a CM to the left, combining with CB.
	153	# ZWJ acts independently to the right, no break from ID by LB8a.
2ca993e8	154	LB20: . CM* ÷ CB;
f3c0d7a5	155	LB20.1a: CB CM* ZWJ (ID \| Extended_Pict \| EmojiNRK);
2ca993e8 A	156	LB20.1b: CB CM* ÷;
	157
	158	# Note: Rule 21a must come before 21 to prevent 21.1 from matching HL BA, then
	159	# not picking up the continuing match after the BA from 21a.
	160	LB21a: HL CM* (HY \| BA) CM* [^CM CB];
	161
	162	LB21.1: . CM* [BA HY NS];
	163	LB21.2: BB CM* [^CM CB];
	164
	165	LB21b: SY CM* HL;
	166
	167	LB22.1: (AL \| HL \| CM) CM* IN; # The CM is from LB10, treat an unattached CM as AL.
	168	LB22.2: EX CM* IN;
	169	LB22.3: (ID \| EB \| EM) CM* IN;
	170	LB22.4: IN CM* IN;
	171	LB22.5: NU CM* IN;
	172
f3c0d7a5 A	173	LB23.1: (AL \| HL \| CM) CM* NU;
	174	LB23.2: NU CM* (AL \| HL);
	175
	176	LB23a.1: PR CM* (ID \| EB \| EM);
	177	LB23a.2: (ID \| EB \| EM) CM* PO;
2ca993e8	178
f3c0d7a5 A	179	LB24.2: (PR \| PO) CM* (AL \| HL);
f3c0d7a5 A	180	LB24.3: (AL \| HL \| CM) CM* (PR \| PO);
2ca993e8 A	181
	182	# Numbers. Equivalent to Tailoring example 8 from UAx 14.
	183	LB25: ((PR \| PO)CM)? ((OP \| HY)CM)? NU (CM(NU \| SY \| IS)) (CM(CL \| CP))? (CM(PR \| PO))?;
	184
	185	LB26.1: JL CM* (JL \| JV \| H2 \| H3);
	186	LB26.2: (JV \| H2) CM* (JV \| JT);
	187	LB26.3: (JT \| H3) CM* JT;
	188
	189	LB27.1: (JL \| JV \| JT \| H2 \| H3) CM* IN;
	190	LB27.2: (JL \| JV \| JT \| H2 \| H3) CM* PO;
	191	LB27.3: PR CM* (JL \| JV \| JT \| H2 \| H3);
	192
	193	# LB28 Do not break between Alphabetics.
	194	# Unattached (leading) CM treated as AL.
	195	LB28: (AL \| HL \| CM)CM* (AL \| HL);
	196
	197	LB29: IS CM* (AL \| HL);
	198
	199	# LB30 is adjusted for unattached leading CM being treated as AL.
	200	LB30.1: (AL \| CM \| HL \| NU) CM* OP;
	201	LB30.2: CP CM* (AL \| HL \| NU);
	202
	203	# LB31 keep pairs of RI together.
	204	LB30a.1: RI CM* RI CM* [BK CR LF NL SP ZW WJ GL CL CP EX IS SY QU BA HY NS];
f3c0d7a5	205	LB30a.2: RI CM* RI CM* ZWJ (ID \| Extended_Pict \| EmojiNRK);
2ca993e8 A	206	LB30a.3: RI CM* RI CM* ÷;
	207
	208	# LB30b Do not break between Emoji Base and Emoji Modifier
	209	LB30b: EB CM* EM;
	210
	211	# LB31 Break Everywhere Else.
	212	# Include combining marks
f3c0d7a5	213	LB31.1: . CM* ZWJ (ID \| Extended_Pict \| EmojiNRK);
2ca993e8	214	LB31.2: . CM* ÷;