-# Copyright (c) 2002-2003 International Business Machines Corporation and
+# Copyright (c) 2002-2012 International Business Machines Corporation and
# others. All Rights Reserved.
#
# file: line.txt
#
# Line Breaking Rules
-# Implement default line breaking as defined by Unicode TR 14.
+# Implement default line breaking as defined by
+# Unicode Standard Annex #14 Revision 29 for Unicode 6.2
+# http://www.unicode.org/reports/tr14/
#
-
+# 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.
#
# Character Classes defined by TR 14.
#
+!!chain;
+!!LBCMNoChain;
+
+
+!!lookAheadHardBreak;
+#
+# !!lookAheadHardBreak Described here because it is (as yet) undocumented elsewhere
+# and only used for the line break rules.
+#
+# It is used in the implementation of rule LB 10
+# which says to treat any combining mark that is not attached to a base
+# character as if it were of class AL (alphabetic).
+#
+# The problem occurs in the reverse rules.
+#
+# Consider a sequence like, with correct breaks as shown
+# LF ID CM AL AL
+# ^ ^ ^
+# Then consider the sequence without the initial ID (ideographic)
+# LF CM AL AL
+# ^ ^
+# Our CM, which in the first example was attached to the ideograph,
+# is now unattached, becomes an alpha, and joins in with the other
+# alphas.
+#
+# When iterating forwards, these sequences do not present any problems
+# When iterating backwards, we need to look ahead when encountering
+# a CM to see whether it attaches to something further on or not.
+# (Look-ahead in a reverse rule is looking towards the start)
+#
+# If the CM is unattached, we need to force a break.
+#
+# !!lookAheadHardBreak forces the run time state machine to
+# stop immediately when a look ahead rule ( '/' operator) matches,
+# and set the match position to that of the look-ahead operator,
+# no matter what other rules may be in play at the time.
+#
+# See rule LB 19 for an example.
+#
+
$AI = [:LineBreak = Ambiguous:];
$AL = [:LineBreak = Alphabetic:];
$BA = [:LineBreak = Break_After:];
$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:];
$EX = [:LineBreak = Exclamation:];
$GL = [:LineBreak = Glue:];
+$HL = [:LineBreak = Hebrew_Letter:];
$HY = [:LineBreak = Hyphen:];
+$H2 = [:LineBreak = H2:];
+$H3 = [:LineBreak = H3:];
$ID = [:LineBreak = Ideographic:];
$IN = [:LineBreak = Inseperable:];
$IS = [:LineBreak = Infix_Numeric:];
+$JL = [:LineBreak = JL:];
+$JV = [:LineBreak = JV:];
+$JT = [:LineBreak = JT:];
$LF = [:LineBreak = Line_Feed:];
-$NS = [:LineBreak = Nonstarter:];
+$NL = [:LineBreak = Next_Line:];
+$NS = [[:LineBreak = Nonstarter:] $CJ];
$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:];
$ZW = [:LineBreak = ZWSpace:];
+# Dictionary character set, for triggering language-based break engines. Currently
+# limited to LineBreak=Complex_Context. Note that this set only works in Unicode
+# 5.0 or later as the definition of Complex_Context was corrected to include all
+# characters requiring dictionary break.
+
+$dictionary = [:LineBreak = Complex_Context:];
#
-# Character classes from TR 29. Needed for finding characters.
+# Rule LB1. By default, treat AI (characters with ambiguous east Asian width),
+# SA (South East Asian: Thai, Lao, Khmer)
+# SG (Unpaired Surrogates)
+# XX (Unknown, unassigned)
+# as $AL (Alphabetic)
#
+$ALPlus = [$AL $AI $SA $SG $XX];
+
#
-$Extend = [:Grapheme_Extend = TRUE:];
+# Combining Marks. X $CM* behaves as if it were X. Rule LB6.
+#
+$ALcm = $ALPlus $CM*;
+$BAcm = $BA $CM*;
+$BBcm = $BB $CM*;
+$B2cm = $B2 $CM*;
+$CLcm = $CL $CM*;
+$CPcm = $CP $CM*;
+$EXcm = $EX $CM*;
+$GLcm = $GL $CM*;
+$HLcm = $HL $CM*;
+$HYcm = $HY $CM*;
+$H2cm = $H2 $CM*;
+$H3cm = $H3 $CM*;
+$IDcm = $ID $CM*;
+$INcm = $IN $CM*;
+$IScm = $IS $CM*;
+$JLcm = $JL $CM*;
+$JVcm = $JV $CM*;
+$JTcm = $JT $CM*;
+$NScm = $NS $CM*;
+$NUcm = $NU $CM*;
+$OPcm = $OP $CM*;
+$POcm = $PO $CM*;
+$PRcm = $PR $CM*;
+$QUcm = $QU $CM*;
+$RIcm = $RI $CM*;
+$SYcm = $SY $CM*;
+$WJcm = $WJ $CM*;
+
+## -------------------------------------------------
+!!forward;
#
-# Rule LB1. By default, treat AI (characters with ambiguous east Asian width) and
-# SA (South East Asian: Thai, Lao, Khmer) as $AL (Alphabetic)
+# Each class of character can stand by itself as an unbroken token, with trailing combining stuff
#
-$ALPlus = $AL | $AI | $SA;
+$ALPlus $CM+;
+$BA $CM+;
+$BB $CM+;
+$B2 $CM+;
+$CL $CM+;
+$CP $CM+;
+$EX $CM+;
+$GL $CM+;
+$HL $CM+;
+$HY $CM+;
+$H2 $CM+;
+$H3 $CM+;
+$ID $CM+;
+$IN $CM+;
+$IS $CM+;
+$JL $CM+;
+$JV $CM+;
+$JT $CM+;
+$NS $CM+;
+$NU $CM+;
+$OP $CM+;
+$PO $CM+;
+$PR $CM+;
+$QU $CM+;
+$RI $CM+;
+$SY $CM+;
+$WJ $CM+;
#
-# Combining Marks. X $CM* behaves as if it were X. Rule LB6.
+# CAN_CM is the set of characters that may combine with CM combining chars.
+# Note that Linebreak UAX 14's concept of a combining char and the rules
+# for what they can combine with are _very_ different from the rest of Unicode.
#
-$ALcm = $ALPlus $CM*;
-$IDcm = ($ID $CM* | $SP $CM+);
-$NUcm = $NU $Extend*;
-$HYcm = $HY $Extend*;
-$QUcm = $QU $Extend*;
-$POcm = $PO $Extend*;
-$OPcm = $OP $Extend*;
-$BAcm = $BA $Extend*;
-$BBcm = $BB $Extend*;
-$NScm = $NS $Extend*;
-$GLcm = $GL $Extend*;
-$B2cm = $B2 $Extend*;
-$INcm = $IN $Extend*;
-
+# Note that $CM itself is left out of this set. If CM is needed as a base
+# it must be listed separately in the rule.
+#
+$CAN_CM = [^$SP $BK $CR $LF $NL $ZW $CM]; # Bases that can take CMs
+$CANT_CM = [ $SP $BK $CR $LF $NL $ZW $CM]; # Bases that can't take CMs
-# New Lines. Always break after, never break before.
-# Rule LB 3
#
-# Endings. NewLine or Zero Width Space, or both. Rules 4, 5
-# Because we never break before these things, $Endings
-# appears at the end of line break rule.
+# AL_FOLLOW set of chars that can unconditionally follow an AL
+# Needed in rules where stand-alone $CM s are treated as AL.
+# Chaining is disabled with CM because it causes other failures,
+# so for this one case we need to manually list out longer sequences.
#
-$NLF = $BK | $CR | $LF | $CR $LF;
-$Endings = $SP* $ZW* $NLF?;
+$AL_FOLLOW_NOCM = [$BK $CR $LF $NL $ZW $SP];
+$AL_FOLLOW_CM = [$CL $CP $EX $HL $IS $SY $WJ $GL $OP $QU $BA $HY $NS $IN $NU $ALPlus];
+$AL_FOLLOW = [$AL_FOLLOW_NOCM $AL_FOLLOW_CM];
#
-# Openings Sequences that can precede Words, and that should not be separated from them.
-# Rules LB 9, 10
+# Rule LB 4, 5 Mandatory (Hard) breaks.
#
-$Openings = (($QUcm $SP*)? $OPcm $SP*)*;
+$LB4Breaks = [$BK $CR $LF $NL];
+$LB4NonBreaks = [^$BK $CR $LF $NL];
+$CR $LF {100};
#
-# Closings Seqences that follow words, and that should not be separated from them,
-# Rule LB 8, 11, 15
-$Closings = ($SP*( ($CL ($SP* $NScm)? | $EX | $IS | $SY) $Extend*) | $BAcm | $HYcm | $NScm)*;
+# LB 6 Do not break before hard line breaks.
+#
+$LB4NonBreaks? $LB4Breaks {100}; # LB 5 do not break before hard breaks.
+$CAN_CM $CM* $LB4Breaks {100};
+$CM+ $LB4Breaks {100};
+
+# LB 7 x SP
+# x ZW
+$LB4NonBreaks [$SP $ZW];
+$CAN_CM $CM* [$SP $ZW];
+$CM+ [$SP $ZW];
#
-# Words. Includes mixed Alpha-numerics.
-# Rules 11a, 16, 17, 19, more or less.
+# LB 8 Break after zero width space
+# TODO: ZW SP* <break>
+# An engine change is required to write the reverse rule for this.
+# For now, leave the Unicode 5.2 rule, ZW <break>
#
-$NumberInterior = $IDcm | ($NUcm | $ALcm | $IS $NUcm)+;
-$Number = $PR? ($OPcm | $HYcm)? $NumberInterior $CL? $POcm?; # Fancy Number 18
-$Word = (($IDcm | ($ALcm | $NUcm)+) ($POcm? | $INcm?)) ; # Alpha-numeric. 16, 17
-$Dashes = (($B2cm $SP*)*); # Dashes 11a
-
-
+$LB8Breaks = [$LB4Breaks $ZW];
+$LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]];
+# LB 9 Combining marks. X $CM needs to behave like X, where X is not $SP, $BK $CR $LF $NL
+# $CM not covered by the above needs to behave like $AL
+# See definition of $CAN_CM.
+
+$CAN_CM $CM+; # Stick together any combining sequences that don't match other rules.
+$CM+;
+
+#
+# LB 11 Do not break before or after WORD JOINER & related characters.
+#
+$CAN_CM $CM* $WJcm;
+$LB8NonBreaks $WJcm;
+$CM+ $WJcm;
+
+$WJcm $CANT_CM;
+$WJcm $CAN_CM $CM*;
+
+#
+# LB 12 Do not break after NBSP and related characters.
+# GL x
+#
+$GLcm $CAN_CM $CM*;
+$GLcm $CANT_CM;
-
-
-$Word15 = ($BBcm* ($Word | $Number | $Dashes)? ($BAcm | $HYcm | $NScm)*) | # Rule 15. Stuff sticks around words.
- [^[:Cc:] $BK $CR $LF $ZW $SP $GL] $Extend* | # Allow characters that don't meet the
- [^$BK $CR $LF $ZW $SP $GL ]; # more elaborate definitions for WORD
- # to be glued.
-
-$GluedWord = ($GLcm | $QUcm)? $Word15 (($GLcm | $QUcm) $Word15)*; # "Glue" will stick anything below it together.
- # Rules 13, 14
+#
+# LB 12a Do not break before NBSP and related characters ...
+# [^SP BA HY] x GL
+#
+[[$LB8NonBreaks] - [$SP $BA $HY]] $CM* $GLcm;
+$CM+ GLcm;
+
+
#
-# The actual rule, a combination of everything defined above.
+# LB 13 Don't break before ']' or '!' or ';' or '/', even after spaces.
#
-$Openings $GluedWord $Closings $Endings;
-# $GluedWord;
+$LB8NonBreaks $CL;
+$CAN_CM $CM* $CL;
+$CM+ $CL; # by rule 10, stand-alone CM behaves as AL
+$LB8NonBreaks $CP;
+$CAN_CM $CM* $CP;
+$CM+ $CP; # by rule 10, stand-alone CM behaves as AL
+$LB8NonBreaks $EX;
+$CAN_CM $CM* $EX;
+$CM+ $EX; # by rule 10, stand-alone CM behaves as AL
+$LB8NonBreaks $IS;
+$CAN_CM $CM* $IS;
+$CM+ $IS; # by rule 10, stand-alone CM behaves as AL
+$LB8NonBreaks $SY;
+$CAN_CM $CM* $SY;
+$CM+ $SY; # by rule 10, stand-alone CM behaves as AL
+
+
+#
+# LB 14 Do not break after OP, even after spaces
+#
+$OPcm $SP* $CAN_CM $CM*;
+$OPcm $SP* $CANT_CM;
+
+$OPcm $SP+ $CM+ $AL_FOLLOW?; # by rule 10, stand-alone CM behaves as AL
+
+# LB 15
+$QUcm $SP* $OPcm;
+
+# LB 16
+($CLcm | $CPcm) $SP* $NScm;
+
+# LB 17
+$B2cm $SP* $B2cm;
+
+#
+# LB 18 Break after spaces.
+#
+$LB18NonBreaks = [$LB8NonBreaks - [$SP]];
+$LB18Breaks = [$LB8Breaks $SP];
+
+
+# LB 19
+# x QU
+$LB18NonBreaks $CM* $QUcm;
+$CM+ $QUcm;
+
+# QU x
+$QUcm .?;
+$QUcm $LB18NonBreaks $CM*; # Don't let a combining mark go onto $CR, $BK, etc.
+ # TODO: I don't think this rule is needed.
+
+
+# LB 20
+# <break> $CB
+# $CB <break>
+
+$LB20NonBreaks = [$LB18NonBreaks - $CB];
+
+# LB 21 x (BA | HY | NS)
+# BB x
+#
+$LB20NonBreaks $CM* ($BAcm | $HYcm | $NScm);
+
+$BBcm [^$CB]; # $BB x
+$BBcm $LB20NonBreaks $CM*;
+
+# LB 21a Don't break after Hebrew + Hyphen
+# HL (HY | BA) x
+#
+$HLcm ($HYcm | $BAcm) [^$CB]?;
+
+# LB 21b (forward) Don't break between SY and HL
+# (break between HL and SY already disallowed by LB 13 above)
+$SYcm $HLcm;
+
+# LB 22
+($ALcm | $HLcm) $INcm;
+$CM+ $INcm; # by rule 10, any otherwise unattached CM behaves as AL
+$IDcm $INcm;
+$INcm $INcm;
+$NUcm $INcm;
+
+
+# $LB 23
+$IDcm $POcm;
+$ALcm $NUcm; # includes $LB19
+$HLcm $NUcm;
+$CM+ $NUcm; # Rule 10, any otherwise unattached CM behaves as AL
+$NUcm $ALcm;
+$NUcm $HLcm;
+
+#
+# LB 24
+#
+$PRcm $IDcm;
+$PRcm ($ALcm | $HLcm);
+$POcm ($ALcm | $HLcm);
+
+#
+# LB 25 Numbers.
+#
+($PRcm | $POcm)? ($OPcm | $HYcm)? $NUcm ($NUcm | $SYcm | $IScm)* ($CLcm | $CPcm)? ($PRcm | $POcm)?;
+
+# LB 26 Do not break a Korean syllable
+#
+$JLcm ($JLcm | $JVcm | $H2cm | $H3cm);
+($JVcm | $H2cm) ($JVcm | $JTcm);
+($JTcm | $H3cm) $JTcm;
+
+# LB 27 Treat korean Syllable Block the same as ID (don't break it)
+($JLcm | $JVcm | $JTcm | $H2cm | $H3cm) $INcm;
+($JLcm | $JVcm | $JTcm | $H2cm | $H3cm) $POcm;
+$PRcm ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm);
+
+
+# LB 28 Do not break between alphabetics
+#
+($ALcm | $HLcm) ($ALcm | $HLcm);
+$CM+ ($ALcm | $HLcm); # The $CM+ is from rule 10, an unattached CM is treated as AL
+
+# LB 29
+$IScm ($ALcm | $HLcm);
+
+# LB 30
+($ALcm | $HLcm | $NUcm) $OPcm;
+$CM+ $OPcm; # The $CM+ is from rule 10, an unattached CM is treated as AL.
+$CPcm ($ALcm | $HLcm | $NUcm);
+
+# LB 30a Do not break between regional indicators.
+$RIcm $RIcm;
#
# Reverse Rules.
#
-# Back up to a hard break or a space that will cause a boundary.
-# Not all spaces cause line breaks. $SpaceGlue represents a sequence
-# containing a space that may inhibit a break from occuring.
+## -------------------------------------------------
+
+!!reverse;
+
+$CM+ $ALPlus;
+$CM+ $BA;
+$CM+ $BB;
+$CM+ $B2;
+$CM+ $CL;
+$CM+ $CP;
+$CM+ $EX;
+$CM+ $GL;
+$CM+ $HL;
+$CM+ $HY;
+$CM+ $H2;
+$CM+ $H3;
+$CM+ $ID;
+$CM+ $IN;
+$CM+ $IS;
+$CM+ $JL;
+$CM+ $JV;
+$CM+ $JT;
+$CM+ $NS;
+$CM+ $NU;
+$CM+ $OP;
+$CM+ $PO;
+$CM+ $PR;
+$CM+ $QU;
+$CM+ $RI;
+$CM+ $SY;
+$CM+ $WJ;
+$CM+;
+
+
+#
+# Sequences of the form (shown forwards)
+# [CANT_CM] <break> [CM] [whatever]
+# The CM needs to behave as an AL
+#
+$AL_FOLLOW $CM+ / (
+ [$BK $CR $LF $NL $ZW {eof}] |
+ $SP+ $CM+ $SP |
+ $SP+ $CM* ([^$OP $CM $SP] | [$AL {eof}])); # if LB 14 will match, need to surpress this break.
+ # LB14 says OP SP* x .
+ # becomes OP SP* x AL
+ # becomes OP SP* x CM+ AL_FOLLOW
+ #
+ # Further note: the $AL in [$AL {eof}] is only to work around
+ # a rule compiler bug which complains about
+ # empty sets otherwise.
+
+#
+# Sequences of the form (shown forwards)
+# [CANT_CM] <break> [CM] <break> [PR]
+# The CM needs to behave as an AL
+# This rule is concerned about getting the second of the two <breaks> in place.
+#
+
+[$PR ] / $CM+ [$BK $CR $LF $NL $ZW $SP {eof}];
+
+
+
+# LB 4, 5, 5
+
+$LB4Breaks [$LB4NonBreaks-$CM];
+$LB4Breaks $CM+ $CAN_CM;
+$LF $CR;
+
+
+# LB 7 x SP
+# x ZW
+[$SP $ZW] [$LB4NonBreaks-$CM];
+[$SP $ZW] $CM+ $CAN_CM;
+
+# LB 8 ZW SP* <break>
+# TODO: to implement this, we need more than one look-ahead hard break in play at a time.
+# Requires an engine enhancement.
+# / $SP* $ZW
+
+# LB 9,10 Combining marks.
+# X $CM needs to behave like X, where X is not $SP or controls.
+# $CM not covered by the above needs to behave like $AL
+# Stick together any combining sequences that don't match other rules.
+$CM+ $CAN_CM;
+
+
+# LB 11
+$CM* $WJ $CM* $CAN_CM;
+$CM* $WJ [$LB8NonBreaks-$CM];
+
+ $CANT_CM $CM* $WJ;
+$CM* $CAN_CM $CM* $WJ;
+
+# LB 12a
+# [^SP BA HY] x GL
+#
+$CM* $GL $CM* [$LB8NonBreaks-[$CM $SP $BA $HY]];
+
+# LB 12
+# GL x
#
+$CANT_CM $CM* $GL;
+$CM* $CAN_CM $CM* $GL;
+
+
+# LB 13
+$CL $CM+ $CAN_CM;
+$CP $CM+ $CAN_CM;
+$EX $CM+ $CAN_CM;
+$IS $CM+ $CAN_CM;
+$SY $CM+ $CAN_CM;
+
+$CL [$LB8NonBreaks-$CM];
+$CP [$LB8NonBreaks-$CM];
+$EX [$LB8NonBreaks-$CM];
+$IS [$LB8NonBreaks-$CM];
+$SY [$LB8NonBreaks-$CM];
+
+# Rule 13 & 14 taken together for an edge case.
+# Match this, shown forward
+# OP SP+ ($CM+ behaving as $AL) (CL | CP | EX | IS | IY)
+# This really wants to chain at the $CM+ (which is acting as an $AL)
+# except for $CM chaining being disabled.
+[$CL $CP $EX $IS $SY] $CM+ $SP+ $CM* $OP;
+
+# LB 14 OP SP* x
+#
+$CM* $CAN_CM $SP* $CM* $OP;
+ $CANT_CM $SP* $CM* $OP;
+$AL_FOLLOW? $CM+ $SP $SP* $CM* $OP; # by LB 10, behaves like $AL_FOLLOW? $AL $SP* $CM* $OP
+
+ $AL_FOLLOW_NOCM $CM+ $SP+ $CM* $OP;
+$CM* $AL_FOLLOW_CM $CM+ $SP+ $CM* $OP;
+$SY $CM $SP+ $OP; # TODO: Experiment. Remove.
+
+
+
+# LB 15
+$CM* $OP $SP* $CM* $QU;
+
+# LB 16
+$CM* $NS $SP* $CM* ($CL | $CP);
+
+# LB 17
+$CM* $B2 $SP* $CM* $B2;
+
+# LB 18 break after spaces
+# Nothing explicit needed here.
+
-$SpaceGlue = ([$ZW $CL $IS $NS $OP] ($Extend* $SP)) | (($Extend* $SP)+ $OP);
-$ClumpingChars = [^$SP $BK $CR $LF];
+#
+# LB 19
+#
+$CM* $QU $CM* $CAN_CM; # . x QU
+$CM* $QU $LB18NonBreaks;
+
+
+$CM* $CAN_CM $CM* $QU; # QU x .
+ $CANT_CM $CM* $QU;
+
+#
+# LB 20 Break before and after CB.
+# nothing needed here.
+#
+
+# LB 21
+$CM* ($BA | $HY | $NS) $CM* [$LB20NonBreaks-$CM]; # . x (BA | HY | NS)
+
+$CM* [$LB20NonBreaks-$CM] $CM* $BB; # BB x .
+[^$CB] $CM* $BB; #
+
+# LB21a
+[^$CB] $CM* ($HY | $BA) $CM* $HL;
+
+# LB21b (reverse)
+$CM* $HL $CM* $SY;
+
+# LB 22
+$CM* $IN $CM* ($ALPlus | $HL);
+$CM* $IN $CM* $ID;
+$CM* $IN $CM* $IN;
+$CM* $IN $CM* $NU;
+
+# LB 23
+$CM* $PO $CM* $ID;
+$CM* $NU $CM* ($ALPlus | $HL);
+$CM* ($ALPlus | $HL) $CM* $NU;
+
+# LB 24
+$CM* $ID $CM* $PR;
+$CM* ($ALPlus | $HL) $CM* $PR;
+$CM* ($ALPlus | $HL) $CM* $PO;
+
+
+# LB 25
+($CM* ($PR | $PO))? ($CM* ($CL | $CP))? ($CM* ($NU | $IS | $SY))* $CM* $NU ($CM* ($OP | $HY))? ($CM* ($PR | $PO))?;
+
+# LB 26
+$CM* ($H3 | $H2 | $JV | $JL) $CM* $JL;
+$CM* ($JT | $JV) $CM* ($H2 | $JV);
+$CM* $JT $CM* ($H3 | $JT);
+
+# LB 27
+$CM* $IN $CM* ($H3 | $H2 | $JT | $JV | $JL);
+$CM* $PO $CM* ($H3 | $H2 | $JT | $JV | $JL);
+$CM* ($H3 | $H2 | $JT | $JV | $JL) $CM* $PR;
+
+# LB 28
+$CM* ($ALPlus | $HL) $CM* ($ALPlus | $HL);
+
+
+# LB 29
+$CM* ($ALPlus | $HL) $CM* $IS;
+
+# LB 30
+$CM* $OP $CM* ($ALPlus | $HL | $NU);
+$CM* ($ALPlus | $HL | $NU) $CM* $CP;
+
+# LB 30a
+$CM* $RI $CM* $RI;
+
+## -------------------------------------------------
+
+!!safe_reverse;
+
+# LB 9
+$CM+ [^$CM $BK $CR $LF $NL $ZW $SP];
+$CM+ $SP / .;
+
+# LB 14
+$SP+ $CM* $OP;
+
+# LB 15
+$SP+ $CM* $QU;
+
+# LB 16
+$SP+ $CM* ($CL | $CP);
+
+# LB 17
+$SP+ $CM* $B2;
+
+# LB 21
+$CM* ($HY | $BA) $CM* $HL;
+
+# LB 25
+($CM* ($IS | $SY))+ $CM* $NU;
+($CL | $CP) $CM* ($NU | $IS | $SY);
+
+# For dictionary-based break
+$dictionary $dictionary;
+
+## -------------------------------------------------
+
+!!safe_forward;
+
+# Skip forward over all character classes that are involved in
+# rules containing patterns with possibly more than one char
+# of context.
+#
+# It might be slightly more efficient to have specific rules
+# instead of one generic one, but only if we could
+# turn off rule chaining. We don't want to move more
+# than necessary.
+#
+[$CM $OP $QU $CL $CP $B2 $PR $HY $BA $SP $dictionary]+ [^$CM $OP $QU $CL $CP $B2 $PR $HY $BA $dictionary];
+$dictionary $dictionary;
-!. . $ClumpingChars* ($SpaceGlue $ClumpingChars*)* (. | $LF $CR);
projects / apple / icu.git / blobdiff