1 # Copyright (C) 2016 and later: Unicode, Inc. and others. 2 # License & terms of use: http://www.unicode.org/copyright.html 3 # Copyright (c) 2002-2016 International Business Machines Corporation and 4 # others. All Rights Reserved. 5 # 6 # file: line_normal.txt 7 # 8 # Line Breaking Rules 9 # Implement default line breaking as defined by 10 # Unicode Standard Annex #14 Revision 37 for Unicode 9.0 11 # http://www.unicode.org/reports/tr14/ 12 # 13 # Includes extensions to the handling of emoji ZWJ sequences from 14 # https://goo.gl/cluFCn 15 # 16 # tailored as noted in 2nd paragraph below. 17 # 18 # TODO: Rule LB 8 remains as it was in Unicode 5.2 19 # This is only because of a limitation of ICU break engine implementation, 20 # not because the older behavior is desirable. 21 # 22 # This tailors the line break behavior to correspond to CSS 23 # line-break=normal (BCP47 -u-lb-normal) as defined for languages other than 24 # Chinese & Japanese. 25 # It sets characters of class CJ to behave like ID. 26 27 # 28 # Character Classes defined by TR 14. 29 # 30 31 !!chain; 32 !!quoted_literals_only; 33 34 $AI = [:LineBreak = Ambiguous:]; 35 $AL = [:LineBreak = Alphabetic:]; 36 $BA = [:LineBreak = Break_After:]; 37 $BB = [:LineBreak = Break_Before:]; 38 $BK = [:LineBreak = Mandatory_Break:]; 39 $B2 = [:LineBreak = Break_Both:]; 40 $CB = [:LineBreak = Contingent_Break:]; 41 $CJ = [:LineBreak = Conditional_Japanese_Starter:]; 42 $CL = [:LineBreak = Close_Punctuation:]; 43 # $CM = [:LineBreak = Combining_Mark:]; 44 $CP = [:LineBreak = Close_Parenthesis:]; 45 $CR = [:LineBreak = Carriage_Return:]; 46 $EB = [:LineBreak = EB:]; 47 $EM = [:LineBreak = EM:]; 48 $EX = [:LineBreak = Exclamation:]; 49 $GL = [:LineBreak = Glue:]; 50 $HL = [:LineBreak = Hebrew_Letter:]; 51 $HY = [:LineBreak = Hyphen:]; 52 $H2 = [:LineBreak = H2:]; 53 $H3 = [:LineBreak = H3:]; 54 # CSS Normal tailoring: CJ resolves to ID 55 $ID = [[:LineBreak = Ideographic:] $CJ]; 56 $IN = [:LineBreak = Inseperable:]; 57 $IS = [:LineBreak = Infix_Numeric:]; 58 $JL = [:LineBreak = JL:]; 59 $JV = [:LineBreak = JV:]; 60 $JT = [:LineBreak = JT:]; 61 $LF = [:LineBreak = Line_Feed:]; 62 $NL = [:LineBreak = Next_Line:]; 63 $NS = [:LineBreak = Nonstarter:]; 64 $NU = [:LineBreak = Numeric:]; 65 $OP = [:LineBreak = Open_Punctuation:]; 66 $PO = [:LineBreak = Postfix_Numeric:]; 67 $PR = [:LineBreak = Prefix_Numeric:]; 68 $QU = [:LineBreak = Quotation:]; 69 $RI = [:LineBreak = Regional_Indicator:]; 70 $SA = [:LineBreak = Complex_Context:]; 71 $SG = [:LineBreak = Surrogate:]; 72 $SP = [:LineBreak = Space:]; 73 $SY = [:LineBreak = Break_Symbols:]; 74 $WJ = [:LineBreak = Word_Joiner:]; 75 $XX = [:LineBreak = Unknown:]; 76 $ZW = [:LineBreak = ZWSpace:]; 77 $ZWJ = [:LineBreak = ZWJ:]; 78 79 $EmojiNRK = [[\p{Emoji}] - [$RI \u002a\u00230-9]]; 80 # Data for Extended Pictographic scraped from CLDR common/properties/ExtendedPictographic.txt, r13267 81 $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]; 82 83 # By LB9, a ZWJ also behaves as a CM. Including it in the definition of CM avoids having to explicitly 84 # list it in the numerous rules that use CM. 85 # By LB1, SA characters with general categor of Mn or Mc also resolve to CM. 86 87 $CM = [[:LineBreak = Combining_Mark:] $ZWJ [$SA & [[:Mn:][:Mc:]]]]; 88 89 # Dictionary character set, for triggering language-based break engines. Currently 90 # limited to LineBreak=Complex_Context (SA). 91 92 $dictionary = [$SA]; 93 94 # 95 # Rule LB1. By default, treat AI (characters with ambiguous east Asian width), 96 # SA (Dictionary chars, excluding Mn and Mc) 97 # SG (Unpaired Surrogates) 98 # XX (Unknown, unassigned) 99 # as $AL (Alphabetic) 100 # 101 $ALPlus = [$AL $AI $SG $XX [$SA-[[:Mn:][:Mc:]]]]; 102 103 104 ## ------------------------------------------------- 105 106 !!forward; 107 108 # 109 # CAN_CM is the set of characters that may combine with CM combining chars. 110 # Note that Linebreak UAX 14's concept of a combining char and the rules 111 # for what they can combine with are _very_ different from the rest of Unicode. 112 # 113 # Note that $CM itself is left out of this set. If CM is needed as a base 114 # it must be listed separately in the rule. 115 # 116 $CAN_CM = [^$SP $BK $CR $LF $NL $ZW $CM]; # Bases that can take CMs 117 $CANT_CM = [ $SP $BK $CR $LF $NL $ZW $CM]; # Bases that can't take CMs 118 119 # 120 # AL_FOLLOW set of chars that can unconditionally follow an AL 121 # Needed in rules where stand-alone $CM s are treated as AL. 122 # 123 $AL_FOLLOW = [$BK $CR $LF $NL $ZW $SP $CL $CP $EX $HL $IS $SY $WJ $GL $OP $QU $BA $HY $NS $IN $NU $PR $PO $ALPlus]; 124 125 126 # 127 # Rule LB 4, 5 Mandatory (Hard) breaks. 128 # 129 $LB4Breaks = [$BK $CR $LF $NL]; 130 $LB4NonBreaks = [^$BK $CR $LF $NL $CM]; 131 $CR $LF {100}; 132 133 # 134 # LB 6 Do not break before hard line breaks. 135 # 136 $LB4NonBreaks? $LB4Breaks {100}; # LB 5 do not break before hard breaks. 137 $CAN_CM $CM* $LB4Breaks {100}; 138 ^$CM+ $LB4Breaks {100}; 139 140 # LB 7 x SP 141 # x ZW 142 $LB4NonBreaks [$SP $ZW]; 143 $CAN_CM $CM* [$SP $ZW]; 144 ^$CM+ [$SP $ZW]; 145 146 # 147 # LB 8 Break after zero width space 148 # TODO: ZW SP* <break> 149 # An engine change is required to write the reverse rule for this. 150 # For now, leave the Unicode 5.2 rule, ZW <break> 151 # 152 $LB8Breaks = [$LB4Breaks $ZW]; 153 $LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]]; 154 155 # LB 8a ZWJ x (ID | Extended_Pict | EmojiNRK) Emoji ZWJ sequences. 156 # 157 $ZWJ ($ID | $Extended_Pict | $EmojiNRK); 158 159 # LB 9 Combining marks. X $CM needs to behave like X, where X is not $SP, $BK $CR $LF $NL 160 # $CM not covered by the above needs to behave like $AL 161 # See definition of $CAN_CM. 162 163 $CAN_CM $CM+; # Stick together any combining sequences that don't match other rules. 164 ^$CM+; 165 166 # 167 # LB 11 Do not break before or after WORD JOINER & related characters. 168 # 169 $CAN_CM $CM* $WJ; 170 $LB8NonBreaks $WJ; 171 ^$CM+ $WJ; 172 173 $WJ $CM* .; 174 175 # 176 # LB 12 Do not break after NBSP and related characters. 177 # GL x 178 # 179 $GL $CM* .; 180 181 # 182 # LB 12a Do not break before NBSP and related characters ... 183 # [^SP BA HY] x GL 184 # 185 [[$LB8NonBreaks] - [$SP $BA $HY]] $CM* $GL; 186 ^$CM+ $GL; 187 188 189 190 # 191 # LB 13 Don't break before ']' or '!' or ';' or '/', even after spaces. 192 # 193 $LB8NonBreaks $CL; 194 $CAN_CM $CM* $CL; 195 ^$CM+ $CL; # by rule 10, stand-alone CM behaves as AL 196 197 $LB8NonBreaks $CP; 198 $CAN_CM $CM* $CP; 199 ^$CM+ $CP; # by rule 10, stand-alone CM behaves as AL 200 201 $LB8NonBreaks $EX; 202 $CAN_CM $CM* $EX; 203 ^$CM+ $EX; # by rule 10, stand-alone CM behaves as AL 204 205 $LB8NonBreaks $IS; 206 $CAN_CM $CM* $IS; 207 ^$CM+ $IS; # by rule 10, stand-alone CM behaves as AL 208 209 $LB8NonBreaks $SY; 210 $CAN_CM $CM* $SY; 211 ^$CM+ $SY; # by rule 10, stand-alone CM behaves as AL 212 213 214 # 215 # LB 14 Do not break after OP, even after spaces 216 # 217 $OP $CM* $SP* .; 218 219 $OP $CM* $SP+ $CM+ $AL_FOLLOW?; # by rule 10, stand-alone CM behaves as AL 220 # by rule 8, CM following a SP is stand-alone. 221 222 # LB 15 223 $QU $CM* $SP* $OP; 224 225 # LB 16 226 ($CL | $CP) $CM* $SP* $NS; 227 228 # LB 17 229 $B2 $CM* $SP* $B2; 230 231 # 232 # LB 18 Break after spaces. 233 # 234 $LB18NonBreaks = [$LB8NonBreaks - [$SP]]; 235 $LB18Breaks = [$LB8Breaks $SP]; 236 237 238 # LB 19 239 # x QU 240 $LB18NonBreaks $CM* $QU; 241 ^$CM+ $QU; 242 243 # QU x 244 $QU $CM* .; 245 246 247 # LB 20 248 # <break> $CB 249 # $CB <break> 250 251 $LB20NonBreaks = [$LB18NonBreaks - $CB]; 252 253 # LB 21 x (BA | HY | NS) 254 # BB x 255 # 256 $LB20NonBreaks $CM* ($BA | $HY | $NS); 257 ^$CM+ ($BA | $HY | $NS); 258 259 $BB $CM* [^$CB]; # $BB x 260 $BB $CM* $LB20NonBreaks; 261 262 # LB 21a Don't break after Hebrew + Hyphen 263 # HL (HY | BA) x 264 # 265 $HL $CM* ($HY | $BA) $CM* [^$CB]?; 266 267 # LB 21b (forward) Don't break between SY and HL 268 # (break between HL and SY already disallowed by LB 13 above) 269 $SY $CM* $HL; 270 271 # LB 22 272 ($ALPlus | $HL) $CM* $IN; 273 ^$CM+ $IN; # by rule 10, any otherwise unattached CM behaves as AL 274 $EX $CM* $IN; 275 ($ID | $EB | $EM) $CM* $IN; 276 $IN $CM* $IN; 277 $NU $CM* $IN; 278 279 280 # $LB 23 281 # 282 ($ALPlus | $HL) $CM* $NU; 283 ^$CM+ $NU; # Rule 10, any otherwise unattached CM behaves as AL 284 $NU $CM* ($ALPlus | $HL); 285 286 # LB 23a 287 # 288 $PR $CM* ($ID | $EB | $EM); 289 ($ID | $EB | $EM) $CM* $PO; 290 291 292 # 293 # LB 24 294 # 295 ($PR | $PO) $CM* ($ALPlus | $HL); 296 ($ALPlus | $HL) $CM* ($PR | $PO); 297 ^$CM+ ($PR | $PO); # Rule 10, any otherwise unattached CM behaves as AL 298 299 # 300 # LB 25 Numbers. 301 # 302 (($PR | $PO) $CM*)? (($OP | $HY) $CM*)? $NU ($CM* ($NU | $SY | $IS))* 303 ($CM* ($CL | $CP))? ($CM* ($PR | $PO))?; 304 305 # LB 26 Do not break a Korean syllable 306 # 307 $JL $CM* ($JL | $JV | $H2 | $H3); 308 ($JV | $H2) $CM* ($JV | $JT); 309 ($JT | $H3) $CM* $JT; 310 311 # LB 27 Treat korean Syllable Block the same as ID (don't break it) 312 ($JL | $JV | $JT | $H2 | $H3) $CM* $IN; 313 ($JL | $JV | $JT | $H2 | $H3) $CM* $PO; 314 $PR $CM* ($JL | $JV | $JT | $H2 | $H3); 315 316 317 # LB 28 Do not break between alphabetics 318 # 319 ($ALPlus | $HL) $CM* ($ALPlus | $HL); 320 ^$CM+ ($ALPlus | $HL); # The $CM+ is from rule 10, an unattached CM is treated as AL 321 322 # LB 29 323 $IS $CM* ($ALPlus | $HL); 324 325 # LB 30 326 ($ALPlus | $HL | $NU) $CM* $OP; 327 ^$CM+ $OP; # The $CM+ is from rule 10, an unattached CM is treated as AL. 328 $CP $CM* ($ALPlus | $HL | $NU); 329 330 # LB 30a Do not break between regional indicators. Break after pairs of them. 331 # Tricky interaction with LB8a: ZWJ x ID 332 $RI $CM* $RI / [[^$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS $CM] {eof}]; 333 $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}]; 334 $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}]; 335 336 $RI $CM* $RI $CM* [$BK $CR $LF $NL $SP $ZW $WJ $CL $CP $EX $IS $SY $GL $QU $BA $HY $NS {eof}]; 337 $RI $CM* $RI $CM* $ZWJ ($ID | $Extended_Pict | $EmojiNRK); 338 339 # LB 30b Do not break between an Emoji Base and an Emoji Modifier 340 $EB $CM* $EM; 341 342 # LB 31 Break everywhere else. 343 # Match a single code point if no other rule applies. 344 .; 345 346 ## ------------------------------------------------- 347 348 !!safe_reverse; 349 350 # LB 9 351 ^$CM+ [^$CM $BK $CR $LF $NL $ZW $SP]; 352 353 # LB 14 354 $SP+ $CM* $OP; 355 356 # LB 15 357 $SP+ $CM* $QU; 358 359 # LB 16 360 $SP+ $CM* ($CL | $CP); 361 362 # LB 17 363 $SP+ $CM* $B2; 364 365 # LB 21 366 $CM* ($HY | $BA) $CM* $HL; 367 368 # LB 25 369 ($CM* ($IS | $SY))+ $CM* $NU; 370 ($CL | $CP) $CM* ($NU | $IS | $SY); 371 372 # LB 30 373 ($CM* $RI)+; 374 375 # For dictionary-based break 376 $dictionary $dictionary; 377
