# Copyright (c) 2002-2004 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.
#
#
# Character Classes defined by TR 14.
#
!!chain;
!!LBCMNoChain;
!!lookAheadHardBreak;
$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:];
$CL = [:LineBreak = Close_Punctuation:];
$CM = [:LineBreak = Combining_Mark:];
$CR = [:LineBreak = Carriage_Return:];
$EX = [:LineBreak = Exclamation:];
$GL = [:LineBreak = Glue:];
$HY = [:LineBreak = Hyphen:];
$ID = [:LineBreak = Ideographic:];
$IN = [:LineBreak = Inseperable:];
$IS = [:LineBreak = Infix_Numeric:];
$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:];
$SA = [:LineBreak = Complex_Context:];
$SG = [:LineBreak = Surrogate:];
$SP = [:LineBreak = Space:];
$SY = [:LineBreak = Break_Symbols:];
$WJ = [:LineBreak = Word_Joiner:];
$XX = [:LineBreak = Unknown:];
$ZW = [:LineBreak = ZWSpace:];
#
# Korean Syllable Definitions
#
$L = [:Hangul_Syllable_Type = L:];
$V = [:Hangul_Syllable_Type = V:];
$T = [:Hangul_Syllable_Type = T:];
$LV = [:Hangul_Syllable_Type = LV:];
$LVT = [:Hangul_Syllable_Type = LVT:];
$HangulSyllable = $L+ | ($L* ($LV? $V+ | $LV | $LVT) $T*) | $T+;
#
# Rule LB1. By default, treat AI (characters with ambiguous east Asian width),
# SA (South East Asian: Thai, Lao, Khmer)
# XX (Unknown, unassigned)
# as $AL (Alphabetic)
#
$ALPlus = $AL | $AI | $SA | $XX;
#
# 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*;
$EXcm = $EX $CM*;
$GLcm = $GL $CM*;
$HYcm = $HY $CM*;
$IDcm = ($ID | $HangulSyllable) $CM*;
$INcm = $IN $CM*;
$IScm = $IS $CM*;
$NScm = $NS $CM*;
$NUcm = $NU $CM*;
$OPcm = $OP $CM*;
$POcm = $PO $CM*;
$PRcm = $PR $CM*;
$QUcm = $QU $CM*;
$SPcm = $SP $CM*;
$SYcm = $SY $CM*;
$WJcm = $WJ $CM*;
#
# Each class of character can stand by itself as an unbroken token, with trailing combining stuff
#
$ALPlus $CM+;
$BA $CM+;
$BB $CM+;
$B2 $CM+;
$CL $CM+;
$EX $CM+;
$GL $CM+;
$HY $CM+;
$ID $CM+;
$IN $CM+;
$IS $CM+;
$NS $CM+;
$NU $CM+;
$OP $CM+;
$PO $CM+;
$PR $CM+;
$QU $CM+;
$SP $CM+;
$SY $CM+;
$WJ $CM+;
## -------------------------------------------------
!!forward;
#
# Rule LB 3
$LB3Breaks = [$BK $CR $LF $NL];
$LB3NonBreaks = [^$BK $CR $LF $NL];
$LB5NonBreaks = [[$LB3NonBreaks] - [$ZW]];
$LB3NonBreaks? $LB3Breaks {100};
$LB5NonBreaks $CM* $LB3Breaks {100};
$CR $LF {100};
# LB 4 x SP
# x ZW
$ZW [$SP $ZW];
$LB5NonBreaks $CM* [$SP $ZW];
# LB 5 Break after zero width space
$LB5Breaks = [$LB3Breaks $ZW];
# LB 6
#
# Korean Syllable Definitions
#
($HangulSyllable) $CM*;
# LB 7 Combining marks. $SP $CM needs to behave like $ID.
# X $CM needs to behave like X, where X is not $SP.
# $CM not covered by the above needs to behave like $AL
#
$LB5NonBreaks $CM+; # Stick together any combining sequences that don't match other rules.
# LB 8
$LB5NonBreaks $CM* $CL;
$LB5NonBreaks $CM* $EX;
$LB5NonBreaks $CM* $IS;
$LB5NonBreaks $CM* $SY;
# LB 9
$OPcm $SP* .?;
$OPcm $SP* $LB5NonBreaks $CM*;
# LB 10
$QUcm $SP* $OPcm;
# LB 11
$CLcm $SP* $NScm;
# LB 11a
($B2cm)+;
# LB 11b
$LB5NonBreaks $CM* ($GLcm | $WJcm);
($GLcm | $WJcm) .?;
# LB 12
$LB12NonBreaks = [$LB5NonBreaks - $SP];
# LB 14
$LB12NonBreaks $CM* $QUcm+ .?;
$LB12NonBreaks $CM* $QUcm+ $LB5NonBreaks $CM*;
$SP $CM+ $QUcm+ .?; # LB7a SP CM+ behaves as ID
$SP $CM+ $QUcm+ $LB5NonBreaks $CM*;
$QUcm $LB3NonBreaks?;
$QUcm $LB5NonBreaks $CM*; # Don't let a combining mark go onto $CR, $BK, etc.
# LB 14a
$LB14NonBreaks = [$LB12NonBreaks - $CB];
$LB14CanBreakAfter = $LB14NonBreaks $CM* | $SP $CM+;
# LB 15
$LB14CanBreakAfter ($BAcm | $HYcm | $NScm);
$BBcm [^$CB];
$BBcm [^$CB $CR $LF $BK $NL $ZW] $CM*;
# LB 16
$ALcm $INcm;
$CM+ $INcm; # by rule 7c, 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 18
$PRcm? ($OPcm | $HYcm)? $NUcm ($NUcm | $IScm | $SYcm)* $CLcm? $POcm?;
$PRcm $ALcm;
$PRcm $IDcm;
# LB 19
$CM* $ALcm+; # The $CM* is from rule 7C, and unattached CM is treated as AL
$IScm $ALcm;
#
# Reverse Rules.
#
## -------------------------------------------------
!!reverse;
$CM+ $ALPlus;
$CM+ $BA;
$CM+ $BB;
$CM+ $B2;
$CM+ $CL;
$CM+ $EX;
$CM+ $GL;
$CM+ $HY;
$CM+ $ID;
$CM+ $IN;
$CM+ $IS;
$CM+ $NS;
$CM+ $NU;
$CM+ $OP;
$CM+ $PO;
$CM+ $PR;
$CM+ $QU;
$CM+ $SP;
$CM+ $SY;
$CM+ $WJ;
# LB 3
$LB3Breaks $LB3NonBreaks;
$LB3Breaks $CM* $LB5NonBreaks;
$LF $CR;
# LB 4 x SP
# x ZW
[$SP $ZW] $LB3NonBreaks;
[$SP $ZW] $CM* $LB5NonBreaks;
# LB 5 Break after zero width space
# LB 6 Jamo is treated like an alphabet
$BackHangulSyllable = $L+ | ($T* ($V+$LV? | $LV | $LVT) $L*) | $T+;
$CM* $BackHangulSyllable;
# LB 7 Combining marks.
# $SP $CM needs to behave like $ID.
# X $CM needs to behave like X, where X is not $SP.
# $CM not covered by the above needs to behave like $AL
# Stick together any combining sequences that don't match other rules.
$CM+ $LB5NonBreaks;
# 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* $CL;
# LB 11a
($CM* $B2)+;
# LB 11b
$CM* ($GL | $WJ) $CM* $LB5NonBreaks;
$CM* $LB5NonBreaks $CM* ($GL | $WJ);
. $CM* ($GL | $WJ);
# LB 12
# 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;
# LB 16
$CM* $IN $CM* $ALPlus;
# by rule 7c, any otherwise unattached CM behaves as AL
$CM* $IN $CM+ / $LB5Breaks;
$CM* $IN $CM* ($ID | $CM $SP);
$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
$CM* $ALPlus $CM* $NU;
# LB 18
($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;
## 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
## -------------------------------------------------
!!safe_reverse;
# LB 6
$V+ $L;
# LB 7
$CM+ [^$CM $BK $CR $LF $NL $ZW $SP];
$CM+ $SP / .;
# LB 9
$SP+ $CM* $OP;
# LB 10
$SP+ $CM* $QU;
# LB 11
$SP+ $CM* $CL;
# LB 18
($CM* ($IS | $SY))+ $CM* $NU;
$CL $CM* ($NU | $IS | $SY);
## -------------------------------------------------
!!safe_forward;
# LB 6
$V+ $T;
# LB 7
[^$BK $CR $LF $NL $ZW $SP] $CM+;
$SP $CM+ / [^$CM];
# LB 9
$OP $CM* $SP+;
# LB 10
$QU $CM* $SP+;
# LB 11
$CL $CM* $SP+;
# LB 18
$CM* $PRcm? ($OPcm | $HYcm)? $NU;