icuSources/data/brkitr/line_fi.txt

   1 # Copyright (c) 2002-2012  International Business Machines Corporation and
   2 # others. All Rights Reserved.
   3 #
   4 #  file:  line_fi.txt
   5 #
   6 #         Line Breaking Rules
   7 #         Implement default line breaking as defined by
   8 #         Unicode Standard Annex #14 Revision 29 for Unicode 6.2
   9 #         http://www.unicode.org/reports/tr14/
  10 #
  11 #         TODO:  Rule LB 8 remains as it was in Unicode 5.2
  12 #         This is only because of a limitation of ICU break engine implementation,
  13 #         not because the older behavior is desirable.
  14
  15 #
  16 #  Character Classes defined by TR 14.
  17 #
  18
  19 !!chain;
  20 !!LBCMNoChain;
  21
  22
  23 !!lookAheadHardBreak;
  24 #
  25 #  !!lookAheadHardBreak    Described here because it is (as yet) undocumented elsewhere
  26 #                          and only used for the line break rules.
  27 #
  28 #           It is used in the implementation of rule LB 10
  29 #           which says to treat any combining mark that is not attached to a base
  30 #           character as if it were of class AL  (alphabetic).
  31 #
  32 #           The problem occurs in the reverse rules.
  33 #
  34 #           Consider a sequence like, with correct breaks as shown
  35 #               LF  ID  CM  AL  AL
  36 #                  ^       ^       ^
  37 #           Then consider the sequence without the initial ID (ideographic)
  38 #                 LF  CM  AL  AL
  39 #                    ^           ^
  40 #           Our CM, which in the first example was attached to the ideograph,
  41 #           is now unattached, becomes an alpha, and joins in with the other
  42 #           alphas.
  43 #
  44 #           When iterating forwards, these sequences do not present any problems
  45 #           When iterating backwards, we need to look ahead when encountering
  46 #           a CM to see whether it attaches to something further on or not.
  47 #           (Look-ahead in a reverse rule is looking towards the start)
  48 #
  49 #           If the CM is unattached, we need to force a break.
  50 #
  51 #           !!lookAheadHardBreak forces the run time state machine to
  52 #           stop immediately when a look ahead rule ( '/' operator) matches,
  53 #           and set the match position to that of the look-ahead operator,
  54 #           no matter what other rules may be in play at the time.
  55 #
  56 #           See rule LB 19 for an example.
  57 #
  58
  59 $AI = [:LineBreak =  Ambiguous:];
  60 $AL = [:LineBreak =  Alphabetic:];
  61 $BA = [[:LineBreak =  Break_After:] - [\u2010]];
  62 $HH = [\u2010];
  63 $BB = [:LineBreak =  Break_Before:];
  64 $BK = [:LineBreak =  Mandatory_Break:];
  65 $B2 = [:LineBreak =  Break_Both:];
  66 $CB = [:LineBreak =  Contingent_Break:];
  67 $CJ = [:LineBreak =  Conditional_Japanese_Starter:];
  68 $CL = [:LineBreak =  Close_Punctuation:];
  69 $CM = [:LineBreak =  Combining_Mark:];
  70 $CP = [:LineBreak =  Close_Parenthesis:];
  71 $CR = [:LineBreak =  Carriage_Return:];
  72 $EX = [:LineBreak =  Exclamation:];
  73 $GL = [:LineBreak =  Glue:];
  74 $HL = [:LineBreak =  Hebrew_Letter:];
  75 $HY = [:LineBreak =  Hyphen:];
  76 $H2 = [:LineBreak =  H2:];
  77 $H3 = [:LineBreak =  H3:];
  78 $ID = [:LineBreak =  Ideographic:];
  79 $IN = [:LineBreak =  Inseperable:];
  80 $IS = [:LineBreak =  Infix_Numeric:];
  81 $JL = [:LineBreak =  JL:];
  82 $JV = [:LineBreak =  JV:];
  83 $JT = [:LineBreak =  JT:];
  84 $LF = [:LineBreak =  Line_Feed:];
  85 $NL = [:LineBreak =  Next_Line:];
  86 $NS = [[:LineBreak =  Nonstarter:] $CJ];
  87 $NU = [:LineBreak =  Numeric:];
  88 $OP = [:LineBreak =  Open_Punctuation:];
  89 $PO = [:LineBreak =  Postfix_Numeric:];
  90 $PR = [:LineBreak =  Prefix_Numeric:];
  91 $QU = [:LineBreak =  Quotation:];
  92 $RI = [:LineBreak =  Regional_Indicator:];
  93 $SA = [:LineBreak =  Complex_Context:];
  94 $SG = [:LineBreak =  Surrogate:];
  95 $SP = [:LineBreak =  Space:];
  96 $SY = [:LineBreak =  Break_Symbols:];
  97 $WJ = [:LineBreak =  Word_Joiner:];
  98 $XX = [:LineBreak =  Unknown:];
  99 $ZW = [:LineBreak =  ZWSpace:];
 100
 101 #   Dictionary character set, for triggering language-based break engines. Currently
 102 #   limited to LineBreak=Complex_Context. Note that this set only works in Unicode
 103 #   5.0 or later as the definition of Complex_Context was corrected to include all
 104 #   characters requiring dictionary break.
 105
 106 $dictionary = [:LineBreak = Complex_Context:];
 107
 108 #
 109 #  Rule LB1.  By default, treat AI  (characters with ambiguous east Asian width),
 110 #                               SA  (South East Asian: Thai, Lao, Khmer)
 111 #                               SG  (Unpaired Surrogates)
 112 #                               XX  (Unknown, unassigned)
 113 #                         as $AL  (Alphabetic)
 114 #
 115 $ALPlus = [$AL $AI $SA $SG $XX];
 116
 117 #
 118 #  Combining Marks.   X $CM*  behaves as if it were X.  Rule LB6.
 119 #
 120 $ALcm = $ALPlus $CM*;
 121 $BAcm = $BA $CM*;
 122 $HHcm = $HH $CM*;
 123 $BBcm = $BB $CM*;
 124 $B2cm = $B2 $CM*;
 125 $CLcm = $CL $CM*;
 126 $CPcm = $CP $CM*;
 127 $EXcm = $EX $CM*;
 128 $GLcm = $GL $CM*;
 129 $HLcm = $HL $CM*;
 130 $HYcm = $HY $CM*;
 131 $H2cm = $H2 $CM*;
 132 $H3cm = $H3 $CM*;
 133 $IDcm = $ID $CM*;
 134 $INcm = $IN $CM*;
 135 $IScm = $IS $CM*;
 136 $JLcm = $JL $CM*;
 137 $JVcm = $JV $CM*;
 138 $JTcm = $JT $CM*;
 139 $NScm = $NS $CM*;
 140 $NUcm = $NU $CM*;
 141 $OPcm = $OP $CM*;
 142 $POcm = $PO $CM*;
 143 $PRcm = $PR $CM*;
 144 $QUcm = $QU $CM*;
 145 $RIcm = $RI $CM*;
 146 $SYcm = $SY $CM*;
 147 $WJcm = $WJ $CM*;
 148
 149 ## -------------------------------------------------
 150
 151 !!forward;
 152
 153 #
 154 #  Each class of character can stand by itself as an unbroken token, with trailing combining stuff
 155 #
 156 $ALPlus $CM+;
 157 $BA $CM+;
 158 $HH $CM+;
 159 $BB $CM+;
 160 $B2 $CM+;
 161 $CL $CM+;
 162 $CP $CM+;
 163 $EX $CM+;
 164 $GL $CM+;
 165 $HL $CM+;
 166 $HY $CM+;
 167 $H2 $CM+;
 168 $H3 $CM+;
 169 $ID $CM+;
 170 $IN $CM+;
 171 $IS $CM+;
 172 $JL $CM+;
 173 $JV $CM+;
 174 $JT $CM+;
 175 $NS $CM+;
 176 $NU $CM+;
 177 $OP $CM+;
 178 $PO $CM+;
 179 $PR $CM+;
 180 $QU $CM+;
 181 $RI $CM+;
 182 $SY $CM+;
 183 $WJ $CM+;
 184
 185 #
 186 # CAN_CM  is the set of characters that may combine with CM combining chars.
 187 #         Note that Linebreak UAX 14's concept of a combining char and the rules
 188 #         for what they can combine with are _very_ different from the rest of Unicode.
 189 #
 190 #         Note that $CM itself is left out of this set.  If CM is needed as a base
 191 #         it must be listed separately in the rule.
 192 #
 193 $CAN_CM  = [^$SP $BK $CR $LF $NL $ZW $CM];       # Bases that can   take CMs
 194 $CANT_CM = [ $SP $BK $CR $LF $NL $ZW $CM];       # Bases that can't take CMs
 195
 196 #
 197 # AL_FOLLOW  set of chars that can unconditionally follow an AL
 198 #            Needed in rules where stand-alone $CM s are treated as AL.
 199 #            Chaining is disabled with CM because it causes other failures,
 200 #            so for this one case we need to manually list out longer sequences.
 201 #
 202 $AL_FOLLOW_NOCM = [$BK $CR $LF $NL $ZW $SP];
 203 $AL_FOLLOW_CM   = [$CL $CP $EX $HL $IS $SY $WJ $GL $OP $QU $BA $HH $HY $NS $IN $NU $ALPlus];
 204 $AL_FOLLOW      = [$AL_FOLLOW_NOCM $AL_FOLLOW_CM];
 205
 206
 207 #
 208 #  Rule LB 4, 5    Mandatory (Hard) breaks.
 209 #
 210 $LB4Breaks    = [$BK $CR $LF $NL];
 211 $LB4NonBreaks = [^$BK $CR $LF $NL];
 212 $CR $LF {100};
 213
 214 #
 215 #  LB 6    Do not break before hard line breaks.
 216 #
 217 $LB4NonBreaks?  $LB4Breaks {100};    # LB 5  do not break before hard breaks.
 218 $CAN_CM $CM*    $LB4Breaks {100};
 219 $CM+            $LB4Breaks {100};
 220
 221 # LB 7         x SP
 222 #              x ZW
 223 $LB4NonBreaks [$SP $ZW];
 224 $CAN_CM $CM*  [$SP $ZW];
 225 $CM+          [$SP $ZW];
 226
 227 #
 228 # LB 8         Break after zero width space
 229 #              TODO:  ZW SP* <break>
 230 #              An engine change is required to write the reverse rule for this.
 231 #              For now, leave the Unicode 5.2 rule, ZW <break>
 232 #
 233 $LB8Breaks    = [$LB4Breaks $ZW];
 234 $LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]];
 235
 236
 237 # LB 9     Combining marks.      X   $CM needs to behave like X, where X is not $SP, $BK $CR $LF $NL
 238 #                                $CM not covered by the above needs to behave like $AL
 239 #                                See definition of $CAN_CM.
 240
 241 $CAN_CM $CM+;                   #  Stick together any combining sequences that don't match other rules.
 242 $CM+;
 243
 244 #
 245 # LB 11  Do not break before or after WORD JOINER & related characters.
 246 #
 247 $CAN_CM $CM*  $WJcm;
 248 $LB8NonBreaks $WJcm;
 249 $CM+          $WJcm;
 250
 251 $WJcm $CANT_CM;
 252 $WJcm $CAN_CM $CM*;
 253
 254 #
 255 # LB 12  Do not break after NBSP and related characters.
 256 #         GL  x
 257 #
 258 $GLcm $CAN_CM $CM*;
 259 $GLcm $CANT_CM;
 260
 261 #
 262 # LB 12a  Do not break before NBSP and related characters ...
 263 #            [^SP BA HY] x GL
 264 #
 265 [[$LB8NonBreaks] - [$SP $BA $HH $HY]] $CM* $GLcm;
 266 $CM+ GLcm;
 267
 268
 269
 270 #
 271 # LB 13   Don't break before ']' or '!' or ';' or '/', even after spaces.
 272 #
 273 $LB8NonBreaks $CL;
 274 $CAN_CM $CM*  $CL;
 275 $CM+          $CL;              # by rule 10, stand-alone CM behaves as AL
 276
 277 $LB8NonBreaks $CP;
 278 $CAN_CM $CM*  $CP;
 279 $CM+          $CP;              # by rule 10, stand-alone CM behaves as AL
 280
 281 $LB8NonBreaks $EX;
 282 $CAN_CM $CM*  $EX;
 283 $CM+          $EX;              # by rule 10, stand-alone CM behaves as AL
 284
 285 $LB8NonBreaks $IS;
 286 $CAN_CM $CM*  $IS;
 287 $CM+          $IS;              # by rule 10, stand-alone CM behaves as AL
 288
 289 $LB8NonBreaks $SY;
 290 $CAN_CM $CM*  $SY;
 291 $CM+          $SY;              # by rule 10, stand-alone CM behaves as AL
 292
 293
 294 #
 295 # LB 14  Do not break after OP, even after spaces
 296 #
 297 $OPcm $SP* $CAN_CM $CM*;
 298 $OPcm $SP* $CANT_CM;
 299
 300 $OPcm $SP+ $CM+ $AL_FOLLOW?;    # by rule 10, stand-alone CM behaves as AL
 301
 302 # LB 15
 303 $QUcm $SP* $OPcm;
 304
 305 # LB 16
 306 ($CLcm | $CPcm) $SP* $NScm;
 307
 308 # LB 17
 309 $B2cm $SP* $B2cm;
 310
 311 #
 312 # LB 18  Break after spaces.
 313 #
 314 $LB18NonBreaks = [$LB8NonBreaks - [$SP]];
 315 $LB18Breaks    = [$LB8Breaks $SP];
 316
 317
 318 # LB 19
 319 #         x QU
 320 $LB18NonBreaks $CM* $QUcm;
 321 $CM+                $QUcm;
 322
 323 #         QU  x
 324 $QUcm .?;
 325 $QUcm $LB18NonBreaks $CM*;    # Don't let a combining mark go onto $CR, $BK, etc.
 326                               #  TODO:  I don't think this rule is needed.
 327
 328
 329 # LB 20
 330 #        <break>  $CB
 331 #        $CB   <break>
 332
 333 $LB20NonBreaks = [$LB18NonBreaks - $CB];
 334
 335 # LB 20.09 added rule for Finnish tailoring
 336 # LB 21        x   (BA | HY | NS)
 337 #           BB x
 338 #
 339 $LB20NonBreaks $CM* ($BAcm | $HHcm | $HYcm | $NScm) / $AL;
 340 $LB20NonBreaks $CM* ($BAcm | $HHcm | $HYcm | $NScm);
 341 ($HY | $HH) $AL;
 342
 343 $BBcm [^$CB];                                  #  $BB  x
 344 $BBcm $LB20NonBreaks $CM*;
 345
 346 # LB 21a Don't break after Hebrew + Hyphen
 347 #   HL (HY | BA) x
 348 #
 349 $HLcm ($HYcm | $BAcm | $HHcm) [^$CB]?;
 350
 351 # LB 22
 352 ($ALcm | $HLcm) $INcm;
 353 $CM+     $INcm;     #  by rule 10, any otherwise unattached CM behaves as AL
 354 $IDcm    $INcm;
 355 $INcm    $INcm;
 356 $NUcm    $INcm;
 357
 358
 359 # $LB 23
 360 $IDcm  $POcm;
 361 $ALcm  $NUcm;       # includes $LB19
 362 $HLcm  $NUcm;
 363 $CM+   $NUcm;       # Rule 10, any otherwise unattached CM behaves as AL
 364 $NUcm  $ALcm;
 365 $NUcm  $HLcm;
 366
 367 #
 368 # LB 24
 369 #
 370 $PRcm $IDcm;
 371 $PRcm ($ALcm | $HLcm);
 372 $POcm ($ALcm | $HLcm);
 373
 374 #
 375 # LB 25   Numbers.
 376 #
 377 ($PRcm | $POcm)? ($OPcm | $HYcm)? $NUcm ($NUcm | $SYcm | $IScm)* ($CLcm | $CPcm)? ($PRcm | $POcm)?;
 378
 379 # LB 26  Do not break a Korean syllable
 380 #
 381 $JLcm ($JLcm | $JVcm | $H2cm | $H3cm);
 382 ($JVcm | $H2cm) ($JVcm | $JTcm);
 383 ($JTcm | $H3cm) $JTcm;
 384
 385 # LB 27  Treat korean Syllable Block the same as ID  (don't break it)
 386 ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm) $INcm;
 387 ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm) $POcm;
 388 $PRcm ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm);
 389
 390
 391 # LB 28   Do not break between alphabetics
 392 #
 393 ($ALcm | $HLcm) ($ALcm | $HLcm);
 394 $CM+ ($ALcm | $HLcm);      # The $CM+ is from rule 10, an unattached CM is treated as AL
 395
 396 # LB 29
 397 $IScm ($ALcm | $HLcm);
 398
 399 # LB 30
 400 ($ALcm | $HLcm | $NUcm) $OPcm;
 401 $CM+ $OPcm;         # The $CM+ is from rule 10, an unattached CM is treated as AL.
 402 $CPcm ($ALcm | $HLcm | $NUcm);
 403
 404 # LB 30a  Do not break between regional indicators.
 405 $RIcm $RIcm;
 406
 407 #
 408 #  Reverse Rules.
 409 #
 410 ## -------------------------------------------------
 411
 412 !!reverse;
 413
 414 $CM+ $ALPlus;
 415 $CM+ $BA;
 416 $CM+ $HH;
 417 $CM+ $BB;
 418 $CM+ $B2;
 419 $CM+ $CL;
 420 $CM+ $CP;
 421 $CM+ $EX;
 422 $CM+ $GL;
 423 $CM+ $HL;
 424 $CM+ $HY;
 425 $CM+ $H2;
 426 $CM+ $H3;
 427 $CM+ $ID;
 428 $CM+ $IN;
 429 $CM+ $IS;
 430 $CM+ $JL;
 431 $CM+ $JV;
 432 $CM+ $JT;
 433 $CM+ $NS;
 434 $CM+ $NU;
 435 $CM+ $OP;
 436 $CM+ $PO;
 437 $CM+ $PR;
 438 $CM+ $QU;
 439 $CM+ $RI;
 440 $CM+ $SY;
 441 $CM+ $WJ;
 442 $CM+;
 443
 444
 445 #
 446 #  Sequences of the form  (shown forwards)
 447 #      [CANT_CM]  <break>  [CM]  [whatever]
 448 #  The CM needs to behave as an AL
 449 #
 450 $AL_FOLLOW $CM+ / (
 451           [$BK $CR $LF $NL $ZW {eof}] |
 452           $SP+ $CM+ $SP |
 453           $SP+ $CM* ([^$OP $CM $SP] | [$AL {eof}]));   # if LB 14 will match, need to surpress this break.
 454                                                #  LB14 says    OP SP* x .
 455                                                #    becomes    OP SP* x AL
 456                                                #    becomes    OP SP* x CM+ AL_FOLLOW
 457                                                #
 458                                                # Further note:  the $AL in [$AL {eof}] is only to work around
 459                                                #                a rule compiler bug which complains about
 460                                                #                empty sets otherwise.
 461
 462 #
 463 #  Sequences of the form  (shown forwards)
 464 #      [CANT_CM]  <break> [CM]  <break>  [PR]
 465 #  The CM needs to behave as an AL
 466 #  This rule is concerned about getting the second of the two <breaks> in place.
 467 #
 468
 469 [$PR   ] / $CM+ [$BK $CR $LF $NL $ZW $SP {eof}];
 470
 471
 472
 473 # LB 4, 5, 5
 474
 475 $LB4Breaks [$LB4NonBreaks-$CM];
 476 $LB4Breaks $CM+ $CAN_CM;
 477 $LF $CR;
 478
 479
 480 # LB 7         x SP
 481 #              x ZW
 482 [$SP $ZW] [$LB4NonBreaks-$CM];
 483 [$SP $ZW] $CM+ $CAN_CM;
 484
 485 # LB 8 ZW SP* <break>
 486 #     TODO: to implement this, we need more than one look-ahead hard break in play at a time.
 487 #           Requires an engine enhancement.
 488 #   / $SP* $ZW
 489
 490 # LB 9,10  Combining marks.
 491 #    X   $CM needs to behave like X, where X is not $SP or controls.
 492 #    $CM not covered by the above needs to behave like $AL
 493 # Stick together any combining sequences that don't match other rules.
 494 $CM+ $CAN_CM;
 495
 496
 497 # LB 11
 498 $CM* $WJ $CM* $CAN_CM;
 499 $CM* $WJ      [$LB8NonBreaks-$CM];
 500
 501      $CANT_CM $CM* $WJ;
 502 $CM* $CAN_CM  $CM* $WJ;
 503
 504 # LB 12a
 505 #      [^SP BA HY] x GL
 506 #
 507 $CM* $GL $CM* [$LB8NonBreaks-[$CM $SP $BA $HH $HY]];
 508
 509 # LB 12
 510 #     GL  x
 511 #
 512 $CANT_CM $CM* $GL;
 513 $CM* $CAN_CM $CM* $GL;
 514
 515
 516 # LB 13
 517 $CL $CM+ $CAN_CM;
 518 $CP $CM+ $CAN_CM;
 519 $EX $CM+ $CAN_CM;
 520 $IS $CM+ $CAN_CM;
 521 $SY $CM+ $CAN_CM;
 522
 523 $CL [$LB8NonBreaks-$CM];
 524 $CP [$LB8NonBreaks-$CM];
 525 $EX [$LB8NonBreaks-$CM];
 526 $IS [$LB8NonBreaks-$CM];
 527 $SY [$LB8NonBreaks-$CM];
 528
 529 # Rule 13 & 14 taken together for an edge case.
 530 #   Match this, shown forward
 531 #     OP SP+  ($CM+ behaving as $AL) (CL | CP | EX | IS | IY)
 532 #   This really wants to chain at the $CM+ (which is acting as an $AL)
 533 #   except for $CM chaining being disabled.
 534 [$CL $CP $EX $IS $SY] $CM+ $SP+ $CM* $OP;
 535
 536 # LB 14    OP SP* x
 537 #
 538 $CM* $CAN_CM    $SP* $CM* $OP;
 539      $CANT_CM   $SP* $CM* $OP;
 540 $AL_FOLLOW? $CM+  $SP $SP* $CM* $OP;     #  by LB 10, behaves like $AL_FOLLOW? $AL $SP* $CM* $OP
 541
 542      $AL_FOLLOW_NOCM $CM+ $SP+ $CM* $OP;
 543 $CM* $AL_FOLLOW_CM   $CM+ $SP+ $CM* $OP;
 544 $SY $CM $SP+ $OP;   # TODO:  Experiment.  Remove.
 545
 546
 547
 548 # LB 15
 549 $CM* $OP $SP* $CM* $QU;
 550
 551 # LB 16
 552 $CM* $NS $SP* $CM* ($CL | $CP);
 553
 554 # LB 17
 555 $CM* $B2 $SP* $CM* $B2;
 556
 557 # LB 18  break after spaces
 558 #        Nothing explicit needed here.
 559
 560
 561 #
 562 # LB 19
 563 #
 564 $CM* $QU $CM* $CAN_CM;                                #   . x QU
 565 $CM* $QU      $LB18NonBreaks;
 566
 567
 568 $CM* $CAN_CM  $CM* $QU;                               #   QU x .
 569      $CANT_CM $CM* $QU;
 570
 571 #
 572 #  LB 20  Break before and after CB.
 573 #         nothing needed here.
 574 #
 575
 576 # LB 20.09 added rule for Finnish tailoring
 577 $AL ($HY | $HH) / $SP;
 578
 579 # LB 21
 580 $CM* ($BA | $HH | $HY | $NS) $CM* [$LB20NonBreaks-$CM];     #  . x (BA | HY | NS)
 581
 582 $CM* [$LB20NonBreaks-$CM] $CM* $BB;                   #  BB x .
 583 [^$CB] $CM* $BB;                                      #
 584
 585 # LB21a
 586 [^$CB] $CM* ($HY | $BA | $HH) $CM* $HL;
 587
 588
 589 # LB 22
 590 $CM* $IN $CM* ($ALPlus | $HL);
 591 $CM* $IN $CM* $ID;
 592 $CM* $IN $CM* $IN;
 593 $CM* $IN $CM* $NU;
 594
 595 # LB 23
 596 $CM* $PO $CM* $ID;
 597 $CM* $NU $CM* ($ALPlus | $HL);
 598 $CM* ($ALPlus | $HL) $CM* $NU;
 599
 600 # LB 24
 601 $CM* $ID $CM* $PR;
 602 $CM* ($ALPlus | $HL) $CM* $PR;
 603 $CM* ($ALPlus | $HL) $CM* $PO;
 604
 605
 606 # LB 25
 607 ($CM* ($PR | $PO))? ($CM* ($CL | $CP))? ($CM* ($NU | $IS | $SY))* $CM* $NU ($CM* ($OP | $HY))? ($CM* ($PR | $PO))?;
 608
 609 # LB 26
 610 $CM* ($H3 | $H2 | $JV | $JL) $CM* $JL;
 611 $CM* ($JT | $JV) $CM* ($H2 | $JV);
 612 $CM* $JT $CM* ($H3 | $JT);
 613
 614 # LB 27
 615 $CM* $IN $CM* ($H3 | $H2 | $JT | $JV | $JL);
 616 $CM* $PO $CM* ($H3 | $H2 | $JT | $JV | $JL);
 617 $CM* ($H3 | $H2 | $JT | $JV | $JL) $CM* $PR;
 618
 619 # LB 28
 620 $CM* ($ALPlus | $HL) $CM* ($ALPlus | $HL);
 621
 622
 623 # LB 29
 624 $CM* ($ALPlus | $HL) $CM* $IS;
 625
 626 # LB 30
 627 $CM* $OP $CM* ($ALPlus | $HL | $NU);
 628 $CM* ($ALPlus | $HL | $NU) $CM* $CP;
 629
 630 # LB 30a
 631 $CM* $RI $CM* $RI;
 632
 633 ## -------------------------------------------------
 634
 635 !!safe_reverse;
 636
 637 # LB 9
 638 $CM+ [^$CM $BK $CR $LF $NL $ZW $SP];
 639 $CM+ $SP / .;
 640
 641 # LB 14
 642 $SP+ $CM* $OP;
 643
 644 # LB 15
 645 $SP+ $CM* $QU;
 646
 647 # LB 16
 648 $SP+ $CM* ($CL | $CP);
 649
 650 # LB 17
 651 $SP+ $CM* $B2;
 652
 653 # LB 21
 654 $CM* ($HY | $BA | $HH) $CM* $HL;
 655
 656 # LB 25
 657 ($CM* ($IS | $SY))+ $CM* $NU;
 658 ($CL | $CP) $CM* ($NU | $IS | $SY);
 659
 660 # For dictionary-based break
 661 $dictionary $dictionary;
 662
 663 ## -------------------------------------------------
 664
 665 !!safe_forward;
 666
 667 # Skip forward over all character classes that are involved in
 668 #   rules containing patterns with possibly more than one char
 669 #   of context.
 670 #
 671 #  It might be slightly more efficient to have specific rules
 672 #  instead of one generic one, but only if we could
 673 #  turn off rule chaining.  We don't want to move more
 674 #  than necessary.
 675 #
 676 [$CM $OP $QU $CL $CP $B2 $PR $HY $BA $SP $dictionary]+ [^$CM $OP $QU $CL $CP $B2 $PR $HY $BA $dictionary];
 677 $dictionary $dictionary;
 678