ICU-66108.tar.gz

[apple/icu.git] / icuSources / data / brkitr / rules / line_loose.txt

diff --git a/icuSources/data/brkitr/rules/line_loose.txt b/icuSources/data/brkitr/rules/line_loose.txt
index 1326d90f5e9c986ee06c18a14d980e7f26c58b5e..2794554e0b144c22a6c11228e7f1656ca8e655d6 100644 (file)
--- a/icuSources/data/brkitr/rules/line_loose.txt
+++ b/icuSources/data/brkitr/rules/line_loose.txt
@@ -8,14 +8,11 @@
 #
 #         Line Breaking Rules
 #         Implement default line breaking as defined by
 #
 #         Line Breaking Rules
 #         Implement default line breaking as defined by

-#         Unicode Standard Annex #14 Revision 40 for Unicode 11.0
-#         http://www.unicode.org/reports/tr14/
+#         Unicode Standard Annex #14 Revision 44 for Unicode 13.0
+#         http://www.unicode.org/reports/tr14/, with the following modification:

 #
 #

-#         tailored as noted in 2nd paragraph below.
-#
-#         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
 #
 #         This tailors the line break behavior to correspond to CSS
 #         line-break=loose (BCP47 -u-lb-loose) as defined for languages other than


@@ -35,6 +32,7 @@
 $AI = [:LineBreak =  Ambiguous:];
 $AL = [:LineBreak =  Alphabetic:];
 $BA = [:LineBreak =  Break_After:];
 $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:];
 $BB = [:LineBreak =  Break_Before:];
 $BK = [:LineBreak =  Mandatory_Break:];
 $B2 = [:LineBreak =  Break_Both:];


@@ -44,7 +42,7 @@ $CL = [:LineBreak =  Close_Punctuation:];
 # $CM = [:LineBreak =  Combining_Mark:];
 $CP = [:LineBreak =  Close_Parenthesis:];
 $CR = [:LineBreak =  Carriage_Return:];
 # $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:];
 $EM = [:LineBreak =  EM:];
 $EX = [:LineBreak =  Exclamation:];
 $GL = [:LineBreak =  Glue:];


@@ -78,11 +76,19 @@ $XX = [:LineBreak =  Unknown:];
 $ZW = [:LineBreak =  ZWSpace:];
 $ZWJ = [:LineBreak = ZWJ:];
 
 $ZW = [:LineBreak =  ZWSpace:];
 $ZWJ = [:LineBreak = ZWJ:];
 

+# 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:]]]];
 # 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).
 
 #   Dictionary character set, for triggering language-based break engines. Currently
 #   limited to LineBreak=Complex_Context (SA).


@@ -116,7 +122,7 @@ $CANT_CM = [ $SP $BK $CR $LF $NL $ZW $CM];       # Bases that can't take CMs
 # 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  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];

 
 
 #
 
 
 #


@@ -141,12 +147,11 @@ $CAN_CM $CM*  [$SP $ZW];
 
 #
 # LB 8         Break after zero width space
 
 #
 # 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]];
 #
 $LB8Breaks    = [$LB4Breaks $ZW];
 $LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]];

+$ZW $SP* / [^$SP $ZW $LB4Breaks];

 
 # LB 8a        ZWJ x            Do not break Emoji ZWJ sequences.
 #
 
 # LB 8a        ZWJ x            Do not break Emoji ZWJ sequences.
 #


@@ -183,8 +188,8 @@ $GL $CM* .;
 
 
 
 
 
 

-#
-# 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;
 #
 $LB8NonBreaks $CL;
 $CAN_CM $CM*  $CL;


@@ -198,10 +203,6 @@ $LB8NonBreaks $EX;
 $CAN_CM $CM*  $EX;
 ^$CM+         $EX;              # by rule 10, stand-alone CM behaves as AL
 
 $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
 $LB8NonBreaks $SY;
 $CAN_CM $CM*  $SY;
 ^$CM+         $SY;              # by rule 10, stand-alone CM behaves as AL


@@ -209,12 +210,36 @@ $CAN_CM $CM*  $SY;
 
 #
 # LB 14  Do not break after OP, even after spaces
 
 #
 # 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.
 
 #
 $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;
 
 # LB 15
 $QU $CM* $SP* $OP;
 


@@ -241,18 +266,25 @@ $LB18NonBreaks $CM* $QU;
 #         QU  x
 $QU $CM* .;
 
 #         QU  x
 $QU $CM* .;
 

-

 # LB 20
 #        <break>  $CB
 #        $CB   <break>
 # LB 20
 #        <break>  $CB
 #        $CB   <break>

-
+#

 $LB20NonBreaks = [$LB18NonBreaks - $CB];
 
 $LB20NonBreaks = [$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);
 # 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];                                  #  $BB  x
 ^$CM+ ($BA | $HY | $NS);
 
 $BB $CM* [^$CB];                                  #  $BB  x


@@ -267,16 +299,14 @@ $HL $CM* ($HY | $BA) $CM* [^$CB]?;
 # (break between HL and SY already disallowed by LB 13 above)
 $SY $CM* $HL;
 
 # (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+  $NU;       # Rule 10, any otherwise unattached CM behaves as AL
 #
 ($ALPlus | $HL) $CM* $NU;
 ^$CM+  $NU;       # Rule 10, any otherwise unattached CM behaves as AL


@@ -298,7 +328,7 @@ $PR $CM* ($ID | $EB | $EM);
 #
 # LB 25   Numbers.
 #
 #
 # 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
     ($CM* ($CL | $CP))? ($CM* ($PR | $PO))?;
 
 # LB 26  Do not break a Korean syllable


@@ -322,15 +352,15 @@ $PR $CM* ($JL | $JV | $JT | $H2 | $H3);
 $IS $CM* ($ALPlus | $HL);
 
 # LB 30
 $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 .   together with ZWJ acting like a CM.
 
 # LB 30a  Do not break between regional indicators. Break after pairs of them.
 #         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 $CM]];
-$RI $CM* $RI $CM* [$CM-$ZWJ] / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM]];
-$RI $CM* $RI $CM* [$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $ZWJ {eof}];
+$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.
 # 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.