-# Copyright (C) 2016 and later: Unicode, Inc. and others.
+# Copyright (C) 2016 and later: Unicode, Inc. and others.
# License & terms of use: http://www.unicode.org/copyright.html
+#
# Copyright (c) 2002-2016 International Business Machines Corporation and
# others. All Rights Reserved.
#
#
# Line Breaking Rules
# Implement default line breaking as defined by
-# Unicode Standard Annex #14 Revision 37 for Unicode 9.0
-# http://www.unicode.org/reports/tr14/
-#
-# Includes extensions to the handling of emoji ZWJ sequences from
-# https://goo.gl/cluFCn
-#
-# tailored as noted in 2nd paragraph below.
+# Unicode Standard Annex #14 Revision 44 for Unicode 13.0
+# http://www.unicode.org/reports/tr14/, with the following modification:
#
-# 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.
+# Boundaries between hyphens and following letters are suppressed when
+# there is a boundary preceding the hyphen. See rule 20.9
#
# This tailors the line break behavior to correspond to CSS
# line-break=loose (BCP47 -u-lb-loose) as defined for languages other than
#
!!chain;
+!!quoted_literals_only;
$AI = [:LineBreak = Ambiguous:];
$AL = [:LineBreak = Alphabetic:];
$BA = [:LineBreak = Break_After:];
+$HH = [\u2010]; # \u2010 is HYPHEN, default line break is BA.
$BB = [:LineBreak = Break_Before:];
$BK = [:LineBreak = Mandatory_Break:];
$B2 = [:LineBreak = Break_Both:];
# $CM = [:LineBreak = Combining_Mark:];
$CP = [:LineBreak = Close_Parenthesis:];
$CR = [:LineBreak = Carriage_Return:];
-$EB = [[:LineBreak = EB:] \U0001F46A-\U0001F46D\U0001F46F\U0001F91D\U0001F93C];
+$EB = [:LineBreak = EB:];
$EM = [:LineBreak = EM:];
$EX = [:LineBreak = Exclamation:];
$GL = [:LineBreak = Glue:];
$ZW = [:LineBreak = ZWSpace:];
$ZWJ = [:LineBreak = ZWJ:];
-$EmojiNRK = [[\p{Emoji}] - [$RI \u002a\u00230-9©®™〰〽]];
-# Data for Extended Pictographic scraped from CLDR common/properties/ExtendedPictographic.txt, r13267
-$Extended_Pict = [\U0001F774-\U0001F77F\U00002700-\U00002701\U00002703-\U00002704\U0000270E\U00002710-\U00002711\U00002765-\U00002767\U0001F030-\U0001F093\U0001F094-\U0001F09F\U0001F10D-\U0001F10F\U0001F12F\U0001F16C-\U0001F16F\U0001F1AD-\U0001F1E5\U0001F260-\U0001F265\U0001F203-\U0001F20F\U0001F23C-\U0001F23F\U0001F249-\U0001F24F\U0001F252-\U0001F25F\U0001F266-\U0001F2FF\U0001F7D5-\U0001F7FF\U0001F000-\U0001F003\U0001F005-\U0001F02B\U0001F02C-\U0001F02F\U0001F322-\U0001F323\U0001F394-\U0001F395\U0001F398\U0001F39C-\U0001F39D\U0001F3F1-\U0001F3F2\U0001F3F6\U0001F4FE\U0001F53E-\U0001F548\U0001F54F\U0001F568-\U0001F56E\U0001F571-\U0001F572\U0001F57B-\U0001F586\U0001F588-\U0001F589\U0001F58E-\U0001F58F\U0001F591-\U0001F594\U0001F597-\U0001F5A3\U0001F5A6-\U0001F5A7\U0001F5A9-\U0001F5B0\U0001F5B3-\U0001F5BB\U0001F5BD-\U0001F5C1\U0001F5C5-\U0001F5D0\U0001F5D4-\U0001F5DB\U0001F5DF-\U0001F5E0\U0001F5E2\U0001F5E4-\U0001F5E7\U0001F5E9-\U0001F5EE\U0001F5F0-\U0001F5F2\U0001F5F4-\U0001F5F9\U00002605\U00002607-\U0000260D\U0000260F-\U00002610\U00002612\U00002616-\U00002617\U00002619-\U0000261C\U0000261E-\U0000261F\U00002621\U00002624-\U00002625\U00002627-\U00002629\U0000262B-\U0000262D\U00002630-\U00002637\U0000263B-\U00002647\U00002654-\U0000265F\U00002661-\U00002662\U00002664\U00002667\U00002669-\U0000267A\U0000267C-\U0000267E\U00002680-\U00002691\U00002695\U00002698\U0000269A\U0000269D-\U0000269F\U000026A2-\U000026A9\U000026AC-\U000026AF\U000026B2-\U000026BC\U000026BF-\U000026C3\U000026C6-\U000026C7\U000026C9-\U000026CD\U000026D0\U000026D2\U000026D5-\U000026E8\U000026EB-\U000026EF\U000026F6\U000026FB-\U000026FC\U000026FE-\U000026FF\U00002388\U0001FA00-\U0001FFFD\U0001F0A0-\U0001F0AE\U0001F0B1-\U0001F0BF\U0001F0C1-\U0001F0CF\U0001F0D1-\U0001F0F5\U0001F0AF-\U0001F0B0\U0001F0C0\U0001F0D0\U0001F0F6-\U0001F0FF\U0001F80C-\U0001F80F\U0001F848-\U0001F84F\U0001F85A-\U0001F85F\U0001F888-\U0001F88F\U0001F8AE-\U0001F8FF\U0001F900-\U0001F90B\U0001F91F\U0001F928-\U0001F92F\U0001F931-\U0001F932\U0001F94C\U0001F95F-\U0001F96B\U0001F992-\U0001F997\U0001F9D0-\U0001F9E6\U0001F90C-\U0001F90F\U0001F93F\U0001F94D-\U0001F94F\U0001F96C-\U0001F97F\U0001F998-\U0001F9BF\U0001F9C1-\U0001F9CF\U0001F9E7-\U0001F9FF\U0001F6C6-\U0001F6CA\U0001F6D3-\U0001F6D4\U0001F6E6-\U0001F6E8\U0001F6EA\U0001F6F1-\U0001F6F2\U0001F6F7-\U0001F6F8\U0001F6D5-\U0001F6DF\U0001F6ED-\U0001F6EF\U0001F6F9-\U0001F6FF];
+# OP30 and CP30 are variants of OP and CP that appear in-line in rule LB30 from UAX 14,
+# without a formal name. Because ICU rules require multiple uses of the expressions,
+# give them a single definition with a name
+
+$OP30 = [$OP - [\p{ea=F}\p{ea=W}\p{ea=H}]];
+$CP30 = [$CP - [\p{ea=F}\p{ea=W}\p{ea=H}]];
# By LB9, a ZWJ also behaves as a CM. Including it in the definition of CM avoids having to explicitly
# list it in the numerous rules that use CM.
# By LB1, SA characters with general categor of Mn or Mc also resolve to CM.
$CM = [[:LineBreak = Combining_Mark:] $ZWJ [$SA & [[:Mn:][:Mc:]]]];
+$CMX = [[$CM] - [$ZWJ]];
# Dictionary character set, for triggering language-based break engines. Currently
# limited to LineBreak=Complex_Context (SA).
## -------------------------------------------------
-!!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
# AL_FOLLOW set of chars that can unconditionally follow an AL
# Needed in rules where stand-alone $CM s are treated as AL.
#
-$AL_FOLLOW = [$BK $CR $LF $NL $ZW $SP $CL $CP $EX $HL $IS $SY $WJ $GL $OP $QU $BA $HY $NS $IN $NU $PR $PO $ALPlus];
+$AL_FOLLOW = [$BK $CR $LF $NL $ZW $SP $CL $CP $EX $HL $IS $SY $WJ $GL $OP30 $QU $BA $HY $NS $IN $NU $PR $PO $ALPlus];
#
#
# 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>
+# ZW SP* ÷
#
$LB8Breaks = [$LB4Breaks $ZW];
$LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]];
+$ZW $SP* / [^$SP $ZW $LB4Breaks];
-# LB 8a ZWJ x (ID | Extended_Pict | EmojiNRK) Emoji ZWJ sequences.
+# LB 8a ZWJ x Do not break Emoji ZWJ sequences.
#
-$ZWJ ($ID | $Extended_Pict | $EmojiNRK);
+$ZWJ [^$CM];
# 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
-#
-# LB 13 Don't break before ']' or '!' or ';' or '/', even after spaces.
+
+# LB 13 Don't break before ']' or '!' or or '/', even after spaces.
#
$LB8NonBreaks $CL;
$CAN_CM $CM* $CL;
$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
+# Note subtle interaction with "SP IS /" rules in LB14a.
+# This rule consumes the SP, chaining happens on the IS, effectivley overriding the SP IS rules,
+# which is the desired behavior.
#
$OP $CM* $SP* .;
$OP $CM* $SP+ $CM+ $AL_FOLLOW?; # by rule 10, stand-alone CM behaves as AL
# by rule 8, CM following a SP is stand-alone.
+
+# LB 14a Force a break before start of a number with a leading decimal pt, e.g. " .23"
+# Note: would be simpler to express as "$SP / $IS $CM* $NU;", but ICU rules have limitations.
+# See issue ICU-20303
+
+
+$CanFollowIS = [$BK $CR $LF $NL $SP $ZW $WJ $GL $CL $CP $EX $IS $SY $QU $BA $HY $NS $ALPlus $HL $IN];
+$SP $IS / [^ $CanFollowIS $NU $CM];
+$SP $IS $CM* $CMX / [^ $CanFollowIS $NU $CM];
+
+#
+# LB 14b Do not break before numeric separators (IS), even after spaces.
+
+[$LB8NonBreaks - $SP] $IS;
+$SP $IS $CM* [$CanFollowIS {eof}];
+$SP $IS $CM* $ZWJ [^$CM $NU];
+
+$CAN_CM $CM* $IS;
+^$CM+ $IS; # by rule 10, stand-alone CM behaves as AL
+
+
# LB 15
$QU $CM* $SP* $OP;
# QU x
$QU $CM* .;
-
# LB 20
# <break> $CB
# $CB <break>
-
+#
$LB20NonBreaks = [$LB18NonBreaks - $CB];
+# LB 20.09 Don't break between Hyphens and Letters when there is a break preceding the hyphen.
+# Originally added as a Finnish tailoring, now promoted to default ICU behavior.
+# Note: this is not default UAX-14 behaviour. See issue ICU-8151.
+#
+^($HY | $HH) $CM* $ALPlus;
+
# LB 21 x (BA | HY | NS)
# BB x
#
# DO allow breaks here before NSX, so don't include it
$LB20NonBreaks $CM* ($BA | $HY | $NS);
+
+
^$CM+ ($BA | $HY | $NS);
$BB $CM* [^$CB]; # $BB x
# (break between HL and SY already disallowed by LB 13 above)
$SY $CM* $HL;
-# LB 22
-($ALPlus | $HL) $CM* $IN;
-^$CM+ $IN; # by rule 10, any otherwise unattached CM behaves as AL
-$EX $CM* $IN;
-($ID | $EB | $EM) $CM* $IN;
-# $IN $CM* $IN; # delete this rule for CSS loose
-$NU $CM* $IN;
+
+# LB 22 Do not break before ellipses
+#
+[$LB20NonBreaks - $IN] $CM* $IN; # line_loose tailoring
+^$CM+ $IN;
-# $LB 23
+# LB 23
#
($ALPlus | $HL) $CM* $NU;
^$CM+ $NU; # Rule 10, any otherwise unattached CM behaves as AL
#
# LB 25 Numbers.
#
-(($PR | $PO) $CM*)? (($OP | $HY) $CM*)? $NU ($CM* ($NU | $SY | $IS))*
+(($PR | $PO) $CM*)? (($OP | $HY) $CM*)? ($IS $CM*)? $NU ($CM* ($NU | $SY | $IS))*
($CM* ($CL | $CP))? ($CM* ($PR | $PO))?;
# LB 26 Do not break a Korean syllable
$IS $CM* ($ALPlus | $HL);
# LB 30
-($ALPlus | $HL | $NU) $CM* $OP;
-^$CM+ $OP; # The $CM+ is from rule 10, an unattached CM is treated as AL.
-$CP $CM* ($ALPlus | $HL | $NU);
+($ALPlus | $HL | $NU) $CM* $OP30;
+^$CM+ $OP30; # The $CM+ is from rule 10, an unattached CM is treated as AL.
+$CP30 $CM* ($ALPlus | $HL | $NU);
# LB 30a Do not break between regional indicators. Break after pairs of them.
-# Tricky interaction with LB8a: ZWJ x ID
-$RI $CM* $RI / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM] {eof}];
-$RI $CM* $RI $CM* $ZWJ / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM $ID $Extended_Pict $EmojiNRK] {eof}];
-$RI $CM* $RI $CM* [$CM-$ZWJ] / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM] {eof}];
-
-$RI $CM* $RI $CM* [$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS {eof}];
-$RI $CM* $RI $CM* $ZWJ ($ID | $Extended_Pict | $EmojiNRK);
+# Tricky interaction with LB8a: ZWJ x . together with ZWJ acting like a CM.
+$RI $CM* $RI / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $IN $CM]];
+$RI $CM* $RI $CM* [$CM-$ZWJ] / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $IN $CM]];
+$RI $CM* $RI $CM* [$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $IN $ZWJ {eof}];
+# note: the preceding rule includes {eof} rather than having the last [set] term qualified with '?'
+# because of the chain-out behavior difference. The rule must chain out only from the [set characters],
+# not from the preceding $RI or $CM, which it would be able to do if the set were optional.
# LB 30b Do not break between an Emoji Base and an Emoji Modifier
$EB $CM* $EM;
-#
-# Reverse Rules.
-#
-## -------------------------------------------------
-
-!!reverse;
-
-# LB 9 Combining Marks.
-# Stick together any combining sequences that don't match other rules.
-
-^$CM+ $CAN_CM?;
-
-#
-# Sequences of the form (shown forwards)
-# [CANT_CM] <break> [CM] [whatever]
-# The CM needs to behave as an AL
-#
-$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.
-
-
-# LB 4, 5, 6
-
-$LB4Breaks [$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* $ZW
-
-# LB 8a ZWJ x (ID | Extended_Pict | EmojiNRK)
-#
-($ID | $Extended_Pict | $EmojiNRK) $ZWJ $CM* $CAN_CM?;
-
-
-# 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+ $CAN_CM;
-
-
-# LB 11
-#
-$WJ $CM* $CAN_CM;
-$WJ [$LB8NonBreaks-$CM];
-
- $CANT_CM $CM* $WJ;
-$CAN_CM $CM* $WJ;
-
-# LB 12a
-# [^SP BA HY] x GL
-#
-$GL $CM* [$LB8NonBreaks-[$CM $SP $BA $HY]];
-
-# LB 12
-# GL x
-#
-$CANT_CM $CM* $GL;
-$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];
-
-
-# LB 14 OP SP* x
-#
-. $SP* $CM* $OP;
-$AL_FOLLOW? $CM+ $SP+ $CM* $OP; # by LB 10, behaves like $AL_FOLLOW? $AL $SP+ $CM* $OP
-
-
-# LB 15
-$OP $SP* $CM* $QU;
-
-# LB 16
-# Don't include $NSX here
-$NS $SP* $CM* ($CL | $CP);
-
-# LB 17
-$B2 $SP* $CM* $B2;
-
-# LB 18 break after spaces
-# Nothing explicit needed here.
-
-
-#
-# LB 19
-#
-$QU $CM* $CAN_CM; # . x QU
-$QU $LB18NonBreaks;
-
-
-$CAN_CM $CM* $QU; # QU x .
- $CANT_CM $CM* $QU;
-
-#
-# LB 20 Break before and after CB.
-# nothing needed here.
-#
-
-# LB 21
-# Don't include $NSX here
-($BA | $HY | $NS) $CM* [$LB20NonBreaks-$CM]; # . x (BA | HY | NS)
-
-[$LB20NonBreaks-$CM] $CM* $BB; # BB x .
-[^$CB] $CM* $BB; #
-
-# LB21a
-[^$CB] $CM* ($HY | $BA) $CM* $HL;
-
-# LB21b (reverse)
-$HL $CM* $SY;
-
-# LB 22
-$IN $CM* ($ALPlus | $HL);
-$IN $CM* $EX;
-$IN $CM* ($ID | $EB | $EM);
-# $IN $CM* $IN; # delete this rule for CSS loose
-$IN $CM* $NU;
-
-# LB 23
-$NU $CM* ($ALPlus | $HL);
-($ALPlus | $HL) $CM* $NU;
-
-# LB23a
-($ID | $EB | $EM) $CM* $PR;
-$PO $CM* ($ID | $EB | $EM);
-
-# LB 24
-($ALPlus | $HL) $CM* ($PR | $PO);
-($PR | $PO) $CM* ($ALPlus | $HL);
-
-
-# LB 25
-($CM* ($PR | $PO))? ($CM* ($CL | $CP))? ($CM* ($NU | $IS | $SY))* $CM* $NU ($CM* ($OP | $HY))? ($CM* ($PR | $PO))?;
-
-# LB 26
-($H3 | $H2 | $JV | $JL) $CM* $JL;
-($JT | $JV) $CM* ($H2 | $JV);
-$JT $CM* ($H3 | $JT);
-
-# LB 27
-$IN $CM* ($H3 | $H2 | $JT | $JV | $JL);
-$PO $CM* ($H3 | $H2 | $JT | $JV | $JL);
- ($H3 | $H2 | $JT | $JV | $JL) $CM* $PR;
-
-# LB 28
-($ALPlus | $HL) $CM* ($ALPlus | $HL);
-
-
-# LB 29
-($ALPlus | $HL) $CM* $IS;
-
-# LB 30
-$OP $CM* ($ALPlus | $HL | $NU);
-($ALPlus | $HL | $NU) $CM* $CP;
-
-# LB 30a
-# Pairs of Regional Indicators.
-# The following two rules are nearly identical. The first matches only sequences with an odd number of adjacent RIs,
-# the second with an even number. Stripping away the cruft they look like
-# [^RI] RI / (RI RI)+ ^RI;
-# [^RI] RI RI / (RI RI)+ ^RI;
-#
-# Line Loose tailoring: Don't include NSX here.
-[{bof} $NS $HY $BA $QU $CL $CP $EX $IS $SY $WJ $GL $ZW $SP $BK $CR $LF $NL $ZWJ] $CM* $RI / ($CM* $RI $CM* $RI)+ $CM* [{eof}[^$RI $CM]];
-[{bof} $NS $HY $BA $QU $CL $CP $EX $IS $SY $WJ $GL $ZW $SP $BK $CR $LF $NL $ZWJ] $CM* $RI $CM* $RI / ($CM* $RI $CM* $RI)+ $CM* [{eof}[^$RI $CM]];
-
-# In general, adjacent RIs stay together. The hard-break rules, above, overide this, forcing in the boundaries between pairs.
-$RI $CM* $RI;
-
-# WJ, GL, QU, etc. are classes with rules like "WJ x " which includes "WJ x RI".
-$RI $CM* ([$WJ $GL $QU $BB] | (($HY | $BA)$CM* $HL));
-
-
-# LB 30b Do not break between an Emoji Base and an Emoji Modifier
-$EM $CM* $EB;
-
-
-## -------------------------------------------------
-
-!!safe_reverse;
-
-# LB 9
-^$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 | $SY);
-
-# LB 30
-($CM* $RI)+;
-
-# For dictionary-based break
-$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 $RI $ZWJ $dictionary]+ [^$CM $OP $QU $CL $CP $B2 $PR $HY $BA $RI $ZWJ $dictionary];
-$dictionary $dictionary;
-
+# LB 31 Break everywhere else.
+# Match a single code point if no other rule applies.
+.;
projects / apple / icu.git / blobdiff