X-Git-Url: https://git.saurik.com/apple/icu.git/blobdiff_plain/374ca955a76ecab1204ca8bfa63ff9238d998416..b801cf366c7671a99bdcef84d1e9c0ec64b36723:/icuSources/data/brkitr/line.txt

diff --git a/icuSources/data/brkitr/line.txt b/icuSources/data/brkitr/line.txt
index 944a1ced..8c207abb 100644
--- a/icuSources/data/brkitr/line.txt
+++ b/icuSources/data/brkitr/line.txt
@@ -1,12 +1,19 @@
-# Copyright (c) 2002-2004  International Business Machines Corporation and
+# Copyright (c) 2002-2015  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.
+#
+#         This corresponds to CSS line-break=strict (BCP47 -u-lb-strict).
+#         It sets characters of class CJ to behave like NS.
 
 #
 #  Character Classes defined by TR 14.
@@ -14,7 +21,43 @@
 
 !!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:];
@@ -23,23 +66,32 @@ $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:];
 $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:];
 $NL = [:LineBreak =  Next_Line:];
-$NS = [:LineBreak =  Nonstarter:];
+$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:];
@@ -48,26 +100,30 @@ $WJ = [:LineBreak =  Word_Joiner:];
 $XX = [:LineBreak =  Unknown:];
 $ZW = [:LineBreak =  ZWSpace:];
 
+# Special character classes for people & body part emoji:
+# Subsets of $CM:
+$ZWJ = \u200D;
+$EmojiVar = \uFE0F;
+# The following are subsets of $ID
+$EmojiForSeqs = [\u2764 \U0001F441 \U0001F466-\U0001F469 \U0001F48B \U0001F5E8];
+$EmojiForMods = [\u261D \u26F9 \u270A-\u270D \U0001F385 \U0001F3C3-\U0001F3C4 \U0001F3C7 \U0001F3CA-\U0001F3CB \U0001F442-\U0001F443 \U0001F446-\U0001F450 \U0001F466-\U0001F469 \U0001F46E-\U0001F478 \U0001F47C \U0001F481-\U0001F483 \U0001F485-\U0001F487 \U0001F4AA \U0001F590 \U0001F595 \U0001F596 \U0001F645-\U0001F647 \U0001F64B-\U0001F64F \U0001F6A3 \U0001F6B4-\U0001F6B6 \U0001F6C0 \U0001F918];
+$EmojiMods = [\U0001F3FB-\U0001F3FF];
 
-#
-# Korean Syllable Definitions
-#
-$L   = [:Hangul_Syllable_Type = L:];
-$V   = [:Hangul_Syllable_Type = V:];
-$T   = [:Hangul_Syllable_Type = T:];
+#   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.
 
-$LV  = [:Hangul_Syllable_Type = LV:];
-$LVT = [:Hangul_Syllable_Type = LVT:];
-
-$HangulSyllable = $L+ | ($L* ($LV? $V+ | $LV | $LVT) $T*) | $T+;
+$dictionary = [:LineBreak = Complex_Context:];
 
 #
 #  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 | $XX;
+$ALPlus = [$AL $AI $SA $SG $XX];
 
 #
 #  Combining Marks.   X $CM*  behaves as if it were X.  Rule LB6.
@@ -77,22 +133,33 @@ $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 $CM*;
-$IDcm = ($ID | $HangulSyllable) $CM*;
+$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 $CM*;
-$SPcm = $SP $CM*;
+$RIcm = $RI $CM*;
 $SYcm = $SY $CM*;
 $WJcm = $WJ $CM*;
 
+## -------------------------------------------------
+
+!!forward;
+
 #
 #  Each class of character can stand by itself as an unbroken token, with trailing combining stuff
 #
@@ -101,124 +168,259 @@ $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 $CM+;
-$SP $CM+;
+$RI $CM+;
 $SY $CM+;
 $WJ $CM+;
 
-## -------------------------------------------------
-
-!!forward;
+#
+# 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.
+#
+#         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
 
 #
-#  Rule LB 3
-$LB3Breaks = [$BK $CR $LF $NL];
-$LB3NonBreaks = [^$BK $CR $LF $NL];
-$LB5NonBreaks = [[$LB3NonBreaks] - [$ZW]];
+# AL_FOLLOW  set of chars that can unconditionally follow an AL
+#            Needed in rules where stand-alone $CM s are treated as AL.
+#            Chaining is disabled with CM because it causes other failures,
+#            so for this one case we need to manually list out longer sequences.
+#
+$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];
+
 
-$LB3NonBreaks?     $LB3Breaks {100};
-$LB5NonBreaks $CM* $LB3Breaks {100};
+#
+#  Rule LB 4, 5    Mandatory (Hard) breaks.
+#
+$LB4Breaks    = [$BK $CR $LF $NL];
+$LB4NonBreaks = [^$BK $CR $LF $NL];
 $CR $LF {100};
 
-# LB 4         x SP
-#              x ZW
-$ZW [$SP $ZW];
-$LB5NonBreaks $CM* [$SP $ZW];
+#
+#  LB 6    Do not break before hard line breaks.
+#
+$LB4NonBreaks?  $LB4Breaks {100};    # LB 5  do not break before hard breaks.
+$CAN_CM $CM*    $LB4Breaks {100};
+$CM+            $LB4Breaks {100};
 
-# LB 5         Break after zero width space
-$LB5Breaks = [$LB3Breaks $ZW];
+# LB 7         x SP
+#              x ZW
+$LB4NonBreaks [$SP $ZW];
+$CAN_CM $CM*  [$SP $ZW];
+$CM+          [$SP $ZW];
 
-# LB 6
 #
-# Korean Syllable Definitions
+# 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>
 #
+$LB8Breaks    = [$LB4Breaks $ZW];
+$LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]];
+
 
-($HangulSyllable) $CM*;
+# Special forward rule for people & body part emoji:
+# don't break $ZWJ from subsequent $EmojiForSeqs
+$EmojiForSeqs $EmojiVar? $EmojiMods? $ZWJ $EmojiForSeqs;
 
-# LB 7     Combining marks.      $SP $CM needs to behave like $ID.
-#                                X   $CM needs to behave like X, where X is not $SP.   
+# 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 $AL   
-#                                
-$LB5NonBreaks $CM+;    #  Stick together any combining sequences that don't match other rules.
+#                                See definition of $CAN_CM.
 
-# LB 8
-$LB5NonBreaks $CM* $CL;
-$LB5NonBreaks $CM* $EX;
-$LB5NonBreaks $CM* $IS;
-$LB5NonBreaks $CM* $SY;
+$CAN_CM $CM+;                   #  Stick together any combining sequences that don't match other rules.
+$CM+;
 
-# LB 9
-$OPcm $SP* .?;
-$OPcm $SP* $LB5NonBreaks $CM*;
+#
+# LB 11  Do not break before or after WORD JOINER & related characters.
+#
+$CAN_CM $CM*  $WJcm;
+$LB8NonBreaks $WJcm;
+$CM+          $WJcm;
 
-# LB 10
-$QUcm $SP* $OPcm;
+$WJcm $CANT_CM;
+$WJcm $CAN_CM $CM*;
 
-# LB 11
-$CLcm $SP* $NScm;
+#
+# LB 12  Do not break after NBSP and related characters.
+#         GL  x
+#
+$GLcm $CAN_CM $CM*;
+$GLcm $CANT_CM;
+ 
+#
+# LB 12a  Do not break before NBSP and related characters ...
+#            [^SP BA HY] x GL
+#
+[[$LB8NonBreaks] - [$SP $BA $HY]] $CM* $GLcm;
+$CM+ GLcm;
 
-# LB 11a
-($B2cm)+;
 
-# LB 11b
-$LB5NonBreaks $CM* ($GLcm | $WJcm);
-($GLcm | $WJcm) .?;
 
-# LB 12
-$LB12NonBreaks = [$LB5NonBreaks - $SP];
+#
+# LB 13   Don't break before ']' or '!' or ';' or '/', even after spaces.
+#
+$LB8NonBreaks $CL;
+$CAN_CM $CM*  $CL;
+$CM+          $CL;              # by rule 10, stand-alone CM behaves as AL
 
-# LB 14
-$LB12NonBreaks $CM* $QUcm+ .?;
-$LB12NonBreaks $CM* $QUcm+ $LB5NonBreaks $CM*;
-$SP $CM+            $QUcm+ .?;                      # LB7a  SP CM+ behaves as ID
-$SP $CM+            $QUcm+ $LB5NonBreaks $CM*;
+$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
 
-$QUcm $LB3NonBreaks?;
-$QUcm $LB5NonBreaks $CM*;    # Don't let a combining mark go onto $CR, $BK, etc.
+$LB8NonBreaks $SY;
+$CAN_CM $CM*  $SY;
+$CM+          $SY;              # by rule 10, stand-alone CM behaves as AL
 
-# LB 14a
-$LB14NonBreaks = [$LB12NonBreaks - $CB];
-$LB14CanBreakAfter = $LB14NonBreaks $CM* | $SP $CM+;
+
+#
+# LB 14  Do not break after OP, even after spaces
+#
+$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
-$LB14CanBreakAfter ($BAcm | $HYcm | $NScm);
-$BBcm [^$CB];
-$BBcm [^$CB $CR $LF $BK $NL $ZW] $CM*;
+$QUcm $SP* $OPcm;
 
 # LB 16
-$ALcm    $INcm;
-$CM+     $INcm;     #  by rule 7c, any otherwise unattached CM behaves as AL
+($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    $INcm;
-$SP $CM+ $INcm;     # by rule 7a, $SP $CM behaves like ID
 $INcm    $INcm;
 $NUcm    $INcm;
 
 
-# $LB 17
-($IDcm | $SP $CM+) $POcm;
-$ALcm+ $NUcm;       # includes $LB19
-$CM+   $NUcm;       # Rule 7c
-$NUcm $ALcm+;
+# $LB 23
+$IDcm  $POcm;
+$ALcm  $NUcm;       # includes $LB19
+$HLcm  $NUcm;
+$CM+   $NUcm;       # Rule 10, any otherwise unattached CM behaves as AL
+$NUcm  $ALcm;
+$NUcm  $HLcm;
 
-# LB 18
-$PRcm? ($OPcm | $HYcm)? $NUcm ($NUcm | $IScm | $SYcm)* $CLcm? $POcm?;
-$PRcm $ALcm;
+#
+# LB 24
+#
 $PRcm $IDcm;
+$PRcm ($ALcm | $HLcm);
+$POcm ($ALcm | $HLcm);
 
-# LB 19
-$CM* $ALcm+;    # The $CM* is from rule 7C, and unattached CM is treated as AL
-$IScm $ALcm;
+#
+# LB 25   Numbers.
+#
+($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;
+
+# Special forward rule for people & body part emoji:
+# don't break between relevant emoji and $EmojiMods
+$EmojiForMods $EmojiVar? $EmojiMods;
 
 #
 #  Reverse Rules.
@@ -232,160 +434,269 @@ $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+ $SP;
+$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.
+#
 
-# LB 3
+[$PR   ] / $CM+ [$BK $CR $LF $NL $ZW $SP {eof}];
 
-$LB3Breaks $LB3NonBreaks;
-$LB3Breaks $CM* $LB5NonBreaks;
+
+
+# LB 4, 5, 5
+
+$LB4Breaks [$LB4NonBreaks-$CM];
+$LB4Breaks $CM+ $CAN_CM;
 $LF $CR;
 
-# LB 4         x SP
-#              x ZW
-[$SP $ZW] $LB3NonBreaks;
-[$SP $ZW] $CM* $LB5NonBreaks;
 
-# LB 5 Break after zero width space
+# LB 7         x SP
+#              x ZW
+[$SP $ZW] [$LB4NonBreaks-$CM];
+[$SP $ZW] $CM+ $CAN_CM;
 
-# LB 6 Jamo is treated like an alphabet
+# 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
 
-$BackHangulSyllable = $L+ | ($T* ($V+$LV? | $LV | $LVT) $L*) | $T+;
-$CM* $BackHangulSyllable;
+# Special reverse rule for people & body part emoji:
+# don't break $ZWJ from subsequent $EmojiForSeqs
+$EmojiForSeqs $ZWJ $EmojiMods? $EmojiVar? $EmojiForSeqs;
 
-# LB 7 Combining marks.
-#    $SP $CM needs to behave like $ID.
-#    X   $CM needs to behave like X, where X is not $SP.
+# 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+ $LB5NonBreaks;
+$CM+ $CAN_CM;
 
-# LB 8
-$CL $CM* $LB5NonBreaks;
-$EX $CM* $LB5NonBreaks;
-$IS $CM* $LB5NonBreaks;
-$SY $CM* $LB5NonBreaks;
-
-# LB 9
-$LB5NonBreaks $SP* $CM* $OP;
-
-# LB 10
-$CM* $OP $SP* $CM* $QU;
 
 # LB 11
-$CM* $NS $SP* $CM* $CL;
+$CM* $WJ $CM* $CAN_CM;
+$CM* $WJ      [$LB8NonBreaks-$CM];
 
-# LB 11a
-($CM* $B2)+;
+     $CANT_CM $CM* $WJ;
+$CM* $CAN_CM  $CM* $WJ;
 
-# LB 11b
-$CM* ($GL | $WJ) $CM* $LB5NonBreaks;
-$CM* $LB5NonBreaks $CM* ($GL | $WJ);
-. $CM* ($GL | $WJ);
+# LB 12a
+#      [^SP BA HY] x GL
+#
+$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 14
-$CM* $QU $CM* $LB12NonBreaks;
-$CM* $QU $CM+ $SP;
-$CM* $LB5NonBreaks $CM* $QU;
 
-# LB 14a
-$BackLB14CanBreakAfter = ($CM* [$LB14NonBreaks - $CM]) | ($CM+ $SP);
 
 # LB 15
-$CM* ($BA | $HY | $NS) $BackLB14CanBreakAfter;
-($CM* ($BA | $HY | $NS))+ $CM+ / $LB5Breaks;
-[$CR $LF $BK $NL $ZW] $CM* $BB;
-$CM* [^$CB $CR $LF $BK $NL $ZW] $CM* $BB;
+$CM* $OP $SP* $CM* $QU;
 
 # LB 16
-$CM* $IN $CM* $ALPlus;
-# by rule 7c, any otherwise unattached CM behaves as AL
-$CM* $IN $CM+ / $LB5Breaks;
+$CM* $NS $SP* $CM* ($CL | $CP);
+
+# LB 17
+$CM* $B2 $SP* $CM* $B2;
+
+# LB 18  break after spaces
+#        Nothing explicit needed here.
+
+
+#
+# LB 19
+#
+$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;
 
-$CM* $IN $CM* ($ID | $CM $SP);
+# LB21b (reverse)
+$CM* $HL $CM* $SY;
+
+# LB 22
+$CM* $IN $CM* ($ALPlus | $HL);
+$CM* $IN $CM* $ID;
 $CM* $IN $CM* $IN;
 $CM* $IN $CM* $NU;
 
-# $LB 17
-$CM* $PO $CM* ($ID | $CM $SP);
-$CM* $NU ($CM* $ALPlus)+; # includes $LB19
-$CM* $NU $CM+ / $LB5Breaks;        # Rule 7c
+# LB 23
+$CM* $PO $CM* $ID;
+$CM* $NU $CM* ($ALPlus | $HL);
+$CM* ($ALPlus | $HL) $CM* $NU;
 
-$CM* $ALPlus $CM* $NU;
+# LB 24
+$CM* $ID $CM* $PR;
+$CM* ($ALPlus | $HL) $CM* $PR;
+$CM* ($ALPlus | $HL) $CM* $PO;
 
-# LB 18
-($CM* $PO)? ($CM* $CL)? ($CM* ($NU | $IS | $SY))* $CM* $NU ($CM* ($OP | $HY))? ($CM* $PR)?;
-$CM* $ALPlus $CM* $PR;
-$CM* ($ID | $BackHangulSyllable) $CM* $PR;
 
-# LB 19
-$CM* $ALPlus $CM* $ALPlus;
-# The $CM* is from rule 7C, and unattached CM is treated as AL
-$CM* $ALPlus $CM* $IS;
-$CM* $ALPlus $CM+ / $LB5Breaks;
+# LB 25
+($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;
 
-## problem state table can't handle lookahead when it is at the
-## start of the string, currently handled in the rbbi code
-## todo fix this
+# Special reverse rule for people & body part emoji:
+# don't break between relevant emoji and $EmojiMods
+$EmojiMods $EmojiVar? $EmojiForMods;
 
 ## -------------------------------------------------
 
 !!safe_reverse;
 
-# LB 6
-$V+ $L;
-
-# LB 7
+# LB 9
 $CM+ [^$CM $BK $CR $LF $NL $ZW $SP];
 $CM+ $SP / .;
 
-# LB 9
+# LB 14
 $SP+ $CM* $OP;
 
-# LB 10
+# LB 15
 $SP+ $CM* $QU;
 
-# LB 11
-$SP+ $CM* $CL;
-
-# LB 18
-($CM* ($IS | $SY))+ $CM* $NU;
-$CL $CM* ($NU | $IS | $SY);
+# LB 16
+$SP+ $CM* ($CL | $CP);
 
-## -------------------------------------------------
+# LB 17
+$SP+ $CM* $B2;
 
-!!safe_forward;
+# LB 21
+$CM* ($HY | $BA) $CM* $HL;
 
-# LB 6
-$V+ $T;
+# LB 25
+($CM* ($IS | $SY))+ $CM* $NU;
+($CL | $CP) $CM* ($NU | $IS | $SY);
 
-# LB 7
-[^$BK $CR $LF $NL $ZW $SP] $CM+;
-$SP $CM+ / [^$CM];
+# For dictionary-based break
+$dictionary $dictionary;
 
-# LB 9
-$OP $CM* $SP+;
+## -------------------------------------------------
 
-# LB 10
-$QU $CM* $SP+;
+!!safe_forward;
 
-# LB 11
-$CL $CM* $SP+;
+# Skip forward over all character classes that are involved in
+#   rules containing patterns with possibly more than one char
+#   of context.
+#
+#  It might be slightly more efficient to have specific rules
+#  instead of one generic one, but only if we could
+#  turn off rule chaining.  We don't want to move more
+#  than necessary.
+#
+[$CM $OP $QU $CL $CP $B2 $PR $HY $BA $SP $dictionary]+ [^$CM $OP $QU $CL $CP $B2 $PR $HY $BA $dictionary];
+$dictionary $dictionary;
 
-# LB 18
-$CM* $PRcm? ($OPcm | $HYcm)? $NU;