skia / external / github.com / unicode-org / icu / refs/tags/icu-release-2-8-d01 / . / source / data / brkitr / line.txt

# Copyright (c) 2002-2003 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. TODO: get it right! | |

# $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)* $CLcm? $POcm?; | |

# LB 19 | |

$CM* $ALcm+; # The $CM* is from rule 7C, and unattached CM is treated as AL | |

# | |

# Reverse Rules. | |

# TODO: Something more efficient. These rules just back up to hard breaks | |

# Note that the initial .. is to back over both halves of a CR/LF sequence | |

# at the current position. | |

# | |

## ------------------------------------------------- | |

!!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))* $CM* $NU ($CM* ($OP | $HY))? ($CM* $PR)?; | |

# LB 19 | |

$CM* $ALPlus $CM* $ALPlus; | |

# The $CM* is from rule 7C, and unattached CM is treated as AL | |

$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)+ $CM* $NU; | |

$CL $CM* ($NU | $IS); | |

## ------------------------------------------------- | |

!!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 | |

$HY $CM* $NU; | |

$IS $CM* $CL; |