-# 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.
!!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:];
$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:];
$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.
$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
#
$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.
$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;
projects / apple / icu.git / blobdiff