icuSources/data/brkitr/line_fi.txt

   1 # Copyright (c) 2002-2010  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 24 for Unicode 6.0
   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 $CL = [:LineBreak =  Close_Punctuation:];
  68 $CM = [:LineBreak =  Combining_Mark:];
  69 $CP = [:LineBreak =  Close_Parenthesis:];
  70 $CR = [:LineBreak =  Carriage_Return:];
  71 $EX = [:LineBreak =  Exclamation:];
  72 $GL = [:LineBreak =  Glue:];
  73 $HY = [:LineBreak =  Hyphen:];
  74 $H2 = [:LineBreak =  H2:];
  75 $H3 = [:LineBreak =  H3:];
  76 $ID = [:LineBreak =  Ideographic:];
  77 $IN = [:LineBreak =  Inseperable:];
  78 $IS = [:LineBreak =  Infix_Numeric:];
  79 $JL = [:LineBreak =  JL:];
  80 $JV = [:LineBreak =  JV:];
  81 $JT = [:LineBreak =  JT:];
  82 $LF = [:LineBreak =  Line_Feed:];
  83 $NL = [:LineBreak =  Next_Line:];
  84 $NS = [:LineBreak =  Nonstarter:];
  85 $NU = [:LineBreak =  Numeric:];
  86 $OP = [:LineBreak =  Open_Punctuation:];
  87 $PO = [:LineBreak =  Postfix_Numeric:];
  88 $PR = [:LineBreak =  Prefix_Numeric:];
  89 $QU = [:LineBreak =  Quotation:];
  90 $SA = [:LineBreak =  Complex_Context:];
  91 $SG = [:LineBreak =  Surrogate:];
  92 $SP = [:LineBreak =  Space:];
  93 $SY = [:LineBreak =  Break_Symbols:];
  94 $WJ = [:LineBreak =  Word_Joiner:];
  95 $XX = [:LineBreak =  Unknown:];
  96 $ZW = [:LineBreak =  ZWSpace:];
  97
  98 #   Dictionary character set, for triggering language-based break engines. Currently
  99 #   limited to LineBreak=Complex_Context. Note that this set only works in Unicode
 100 #   5.0 or later as the definition of Complex_Context was corrected to include all
 101 #   characters requiring dictionary break.
 102
 103 $dictionary = [:LineBreak = Complex_Context:];
 104
 105 #
 106 #  Rule LB1.  By default, treat AI  (characters with ambiguous east Asian width),
 107 #                               SA  (South East Asian: Thai, Lao, Khmer)
 108 #                               SG  (Unpaired Surrogates)
 109 #                               XX  (Unknown, unassigned)
 110 #                         as $AL  (Alphabetic)
 111 #
 112 $ALPlus = [$AL $AI $SA $SG $XX];
 113
 114 #
 115 #  Combining Marks.   X $CM*  behaves as if it were X.  Rule LB6.
 116 #
 117 $ALcm = $ALPlus $CM*;
 118 $BAcm = $BA $CM*;
 119 $HHcm = $HH $CM*;
 120 $BBcm = $BB $CM*;
 121 $B2cm = $B2 $CM*;
 122 $CLcm = $CL $CM*;
 123 $CPcm = $CP $CM*;
 124 $EXcm = $EX $CM*;
 125 $GLcm = $GL $CM*;
 126 $HYcm = $HY $CM*;
 127 $H2cm = $H2 $CM*;
 128 $H3cm = $H3 $CM*;
 129 $IDcm = $ID $CM*;
 130 $INcm = $IN $CM*;
 131 $IScm = $IS $CM*;
 132 $JLcm = $JL $CM*;
 133 $JVcm = $JV $CM*;
 134 $JTcm = $JT $CM*;
 135 $NScm = $NS $CM*;
 136 $NUcm = $NU $CM*;
 137 $OPcm = $OP $CM*;
 138 $POcm = $PO $CM*;
 139 $PRcm = $PR $CM*;
 140 $QUcm = $QU $CM*;
 141 $SYcm = $SY $CM*;
 142 $WJcm = $WJ $CM*;
 143
 144 ## -------------------------------------------------
 145
 146 !!forward;
 147
 148 #
 149 #  Each class of character can stand by itself as an unbroken token, with trailing combining stuff
 150 #
 151 $ALPlus $CM+;
 152 $BA $CM+;
 153 $HH $CM+;
 154 $BB $CM+;
 155 $B2 $CM+;
 156 $CL $CM+;
 157 $CP $CM+;
 158 $EX $CM+;
 159 $GL $CM+;
 160 $HY $CM+;
 161 $H2 $CM+;
 162 $H3 $CM+;
 163 $ID $CM+;
 164 $IN $CM+;
 165 $IS $CM+;
 166 $JL $CM+;
 167 $JV $CM+;
 168 $JT $CM+;
 169 $NS $CM+;
 170 $NU $CM+;
 171 $OP $CM+;
 172 $PO $CM+;
 173 $PR $CM+;
 174 $QU $CM+;
 175 $SY $CM+;
 176 $WJ $CM+;
 177
 178 #
 179 # CAN_CM  is the set of characters that may combine with CM combining chars.
 180 #         Note that Linebreak UAX 14's concept of a combining char and the rules
 181 #         for what they can combine with are _very_ different from the rest of Unicode.
 182 #
 183 #         Note that $CM itself is left out of this set.  If CM is needed as a base
 184 #         it must be listed separately in the rule.
 185 #
 186 $CAN_CM  = [^$SP $BK $CR $LF $NL $ZW $CM];       # Bases that can   take CMs
 187 $CANT_CM = [ $SP $BK $CR $LF $NL $ZW $CM];       # Bases that can't take CMs
 188
 189 #
 190 # AL_FOLLOW  set of chars that can unconditionally follow an AL
 191 #            Needed in rules where stand-alone $CM s are treated as AL.
 192 #            Chaining is disabled with CM because it causes other failures,
 193 #            so for this one case we need to manually list out longer sequences.
 194 #
 195 $AL_FOLLOW_NOCM = [$BK $CR $LF $NL $ZW $SP];
 196 $AL_FOLLOW_CM   = [$CL $CP $EX $IS $SY $WJ $GL $OP $QU $BA $HH $HY $NS $IN $NU $ALPlus];
 197 $AL_FOLLOW      = [$AL_FOLLOW_NOCM $AL_FOLLOW_CM];
 198
 199
 200 #
 201 #  Rule LB 4, 5    Mandatory (Hard) breaks.
 202 #
 203 $LB4Breaks    = [$BK $CR $LF $NL];
 204 $LB4NonBreaks = [^$BK $CR $LF $NL];
 205 $CR $LF {100};
 206
 207 #
 208 #  LB 6    Do not break before hard line breaks.
 209 #
 210 $LB4NonBreaks?  $LB4Breaks {100};    # LB 5  do not break before hard breaks.
 211 $CAN_CM $CM*    $LB4Breaks {100};
 212 $CM+            $LB4Breaks {100};
 213
 214 # LB 7         x SP
 215 #              x ZW
 216 $LB4NonBreaks [$SP $ZW];
 217 $CAN_CM $CM*  [$SP $ZW];
 218 $CM+          [$SP $ZW];
 219
 220 #
 221 # LB 8         Break after zero width space
 222 #              TODO:  ZW SP* <break>
 223 #              An engine change is required to write the reverse rule for this.
 224 #              For now, leave the Unicode 5.2 rule, ZW <break>
 225 #
 226 $LB8Breaks    = [$LB4Breaks $ZW];
 227 $LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]];
 228
 229
 230 # LB 9     Combining marks.      X   $CM needs to behave like X, where X is not $SP, $BK $CR $LF $NL
 231 #                                $CM not covered by the above needs to behave like $AL
 232 #                                See definition of $CAN_CM.
 233
 234 $CAN_CM $CM+;                   #  Stick together any combining sequences that don't match other rules.
 235 $CM+;
 236
 237 #
 238 # LB 11  Do not break before or after WORD JOINER & related characters.
 239 #
 240 $CAN_CM $CM*  $WJcm;
 241 $LB8NonBreaks $WJcm;
 242 $CM+          $WJcm;
 243
 244 $WJcm $CANT_CM;
 245 $WJcm $CAN_CM $CM*;
 246
 247 #
 248 # LB 12  Do not break after NBSP and related characters.
 249 #         GL  x
 250 #
 251 $GLcm $CAN_CM $CM*;
 252 $GLcm $CANT_CM;
 253
 254 #
 255 # LB 12a  Do not break before NBSP and related characters ...
 256 #            [^SP BA HY] x GL
 257 #
 258 [[$LB8NonBreaks] - [$SP $BA $HH $HY]] $CM* $GLcm;
 259 $CM+ GLcm;
 260
 261
 262
 263 #
 264 # LB 13   Don't break before ']' or '!' or ';' or '/', even after spaces.
 265 #
 266 $LB8NonBreaks $CL;
 267 $CAN_CM $CM*  $CL;
 268 $CM+          $CL;              # by rule 10, stand-alone CM behaves as AL
 269
 270 $LB8NonBreaks $CP;
 271 $CAN_CM $CM*  $CP;
 272 $CM+          $CP;              # by rule 10, stand-alone CM behaves as AL
 273
 274 $LB8NonBreaks $EX;
 275 $CAN_CM $CM*  $EX;
 276 $CM+          $EX;              # by rule 10, stand-alone CM behaves as AL
 277
 278 $LB8NonBreaks $IS;
 279 $CAN_CM $CM*  $IS;
 280 $CM+          $IS;              # by rule 10, stand-alone CM behaves as AL
 281
 282 $LB8NonBreaks $SY;
 283 $CAN_CM $CM*  $SY;
 284 $CM+          $SY;              # by rule 10, stand-alone CM behaves as AL
 285
 286
 287 #
 288 # LB 14  Do not break after OP, even after spaces
 289 #
 290 $OPcm $SP* $CAN_CM $CM*;
 291 $OPcm $SP* $CANT_CM;
 292
 293 $OPcm $SP+ $CM+ $AL_FOLLOW?;    # by rule 10, stand-alone CM behaves as AL
 294
 295 # LB 15
 296 $QUcm $SP* $OPcm;
 297
 298 # LB 16
 299 ($CLcm | $CPcm) $SP* $NScm;
 300
 301 # LB 17
 302 $B2cm $SP* $B2cm;
 303
 304 #
 305 # LB 18  Break after spaces.
 306 #
 307 $LB18NonBreaks = [$LB8NonBreaks - [$SP]];
 308 $LB18Breaks    = [$LB8Breaks $SP];
 309
 310
 311 # LB 19
 312 #         x QU
 313 $LB18NonBreaks $CM* $QUcm;
 314 $CM+                $QUcm;
 315
 316 #         QU  x
 317 $QUcm .?;
 318 $QUcm $LB18NonBreaks $CM*;    # Don't let a combining mark go onto $CR, $BK, etc.
 319                               #  TODO:  I don't think this rule is needed.
 320
 321
 322 # LB 20
 323 #        <break>  $CB
 324 #        $CB   <break>
 325
 326 $LB20NonBreaks = [$LB18NonBreaks - $CB];
 327
 328 # LB 20.09 added rule for Finnish tailoring
 329 # LB 21        x   (BA | HY | NS)
 330 #           BB x
 331 #
 332 $LB20NonBreaks $CM* ($BAcm | $HHcm | $HYcm | $NScm) / $AL;
 333 $LB20NonBreaks $CM* ($BAcm | $HHcm | $HYcm | $NScm);
 334 ($HY | $HH) $AL;
 335
 336 $BBcm [^$CB];                                  #  $BB  x
 337 $BBcm $LB20NonBreaks $CM*;
 338
 339 # LB 22
 340 $ALcm    $INcm;
 341 $CM+     $INcm;     #  by rule 10, any otherwise unattached CM behaves as AL
 342 $IDcm    $INcm;
 343 $INcm    $INcm;
 344 $NUcm    $INcm;
 345
 346
 347 # $LB 23
 348 $IDcm  $POcm;
 349 $ALcm  $NUcm;       # includes $LB19
 350 $CM+   $NUcm;       # Rule 10, any otherwise unattached CM behaves as AL
 351 $NUcm  $ALcm;
 352
 353 #
 354 # LB 24
 355 #
 356 $PRcm $IDcm;
 357 $PRcm $ALcm;
 358 $POcm $ALcm;
 359
 360 #
 361 # LB 25   Numbers.
 362 #
 363 ($PRcm | $POcm)? ($OPcm | $HYcm)? $NUcm ($NUcm | $SYcm | $IScm)* ($CLcm | $CPcm)? ($PRcm | $POcm)?;
 364
 365 # LB 26  Do not break a Korean syllable
 366 #
 367 $JLcm ($JLcm | $JVcm | $H2cm | $H3cm);
 368 ($JVcm | $H2cm) ($JVcm | $JTcm);
 369 ($JTcm | $H3cm) $JTcm;
 370
 371 # LB 27  Treat korean Syllable Block the same as ID  (don't break it)
 372 ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm) $INcm;
 373 ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm) $POcm;
 374 $PRcm ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm);
 375
 376
 377 # LB 28   Do not break between alphabetics
 378 #
 379 $ALcm $ALcm;
 380 $CM+ $ALcm;      # The $CM+ is from rule 10, an unattached CM is treated as AL
 381
 382 # LB 29
 383 $IScm $ALcm;
 384
 385 # LB 30
 386 ($ALcm | $NUcm) $OPcm;
 387 $CM+ $OPcm;         # The $CM+ is from rule 10, an unattached CM is treated as AL.
 388 $CPcm ($ALcm | $NUcm);
 389
 390
 391 #
 392 #  Reverse Rules.
 393 #
 394 ## -------------------------------------------------
 395
 396 !!reverse;
 397
 398 $CM+ $ALPlus;
 399 $CM+ $BA;
 400 $CM+ $HH;
 401 $CM+ $BB;
 402 $CM+ $B2;
 403 $CM+ $CL;
 404 $CM+ $CP;
 405 $CM+ $EX;
 406 $CM+ $GL;
 407 $CM+ $HY;
 408 $CM+ $H2;
 409 $CM+ $H3;
 410 $CM+ $ID;
 411 $CM+ $IN;
 412 $CM+ $IS;
 413 $CM+ $JL;
 414 $CM+ $JV;
 415 $CM+ $JT;
 416 $CM+ $NS;
 417 $CM+ $NU;
 418 $CM+ $OP;
 419 $CM+ $PO;
 420 $CM+ $PR;
 421 $CM+ $QU;
 422 $CM+ $SY;
 423 $CM+ $WJ;
 424 $CM+;
 425
 426
 427 #
 428 #  Sequences of the form  (shown forwards)
 429 #      [CANT_CM]  <break>  [CM]  [whatever]
 430 #  The CM needs to behave as an AL
 431 #
 432 $AL_FOLLOW $CM+ / (
 433           [$BK $CR $LF $NL $ZW {eof}] |
 434           $SP+ $CM+ $SP |
 435           $SP+ $CM* ([^$OP $CM $SP] | [$AL {eof}]));   # if LB 14 will match, need to surpress this break.
 436                                                #  LB14 says    OP SP* x .
 437                                                #    becomes    OP SP* x AL
 438                                                #    becomes    OP SP* x CM+ AL_FOLLOW
 439                                                #
 440                                                # Further note:  the $AL in [$AL {eof}] is only to work around
 441                                                #                a rule compiler bug which complains about
 442                                                #                empty sets otherwise.
 443
 444 #
 445 #  Sequences of the form  (shown forwards)
 446 #      [CANT_CM]  <break> [CM]  <break>  [PR]
 447 #  The CM needs to behave as an AL
 448 #  This rule is concerned about getting the second of the two <breaks> in place.
 449 #
 450
 451 [$PR   ] / $CM+ [$BK $CR $LF $NL $ZW $SP {eof}];
 452
 453
 454
 455 # LB 4, 5, 5
 456
 457 $LB4Breaks [$LB4NonBreaks-$CM];
 458 $LB4Breaks $CM+ $CAN_CM;
 459 $LF $CR;
 460
 461
 462 # LB 7         x SP
 463 #              x ZW
 464 [$SP $ZW] [$LB4NonBreaks-$CM];
 465 [$SP $ZW] $CM+ $CAN_CM;
 466
 467 # LB 8 ZW SP* <break>
 468 #     TODO: to implement this, we need more than one look-ahead hard break in play at a time.
 469 #           Requires an engine enhancement.
 470 #   / $SP* $ZW
 471
 472 # LB 9,10  Combining marks.
 473 #    X   $CM needs to behave like X, where X is not $SP or controls.
 474 #    $CM not covered by the above needs to behave like $AL
 475 # Stick together any combining sequences that don't match other rules.
 476 $CM+ $CAN_CM;
 477
 478
 479 # LB 11
 480 $CM* $WJ $CM* $CAN_CM;
 481 $CM* $WJ      [$LB8NonBreaks-$CM];
 482
 483      $CANT_CM $CM* $WJ;
 484 $CM* $CAN_CM  $CM* $WJ;
 485
 486 # LB 12a
 487 #      [^SP BA HY] x GL
 488 #
 489 $CM* $GL $CM* [$LB8NonBreaks-[$CM $SP $BA $HH $HY]];
 490
 491 # LB 12
 492 #     GL  x
 493 #
 494 $CANT_CM $CM* $GL;
 495 $CM* $CAN_CM $CM* $GL;
 496
 497
 498 # LB 13
 499 $CL $CM+ $CAN_CM;
 500 $CP $CM+ $CAN_CM;
 501 $EX $CM+ $CAN_CM;
 502 $IS $CM+ $CAN_CM;
 503 $SY $CM+ $CAN_CM;
 504
 505 $CL [$LB8NonBreaks-$CM];
 506 $CP [$LB8NonBreaks-$CM];
 507 $EX [$LB8NonBreaks-$CM];
 508 $IS [$LB8NonBreaks-$CM];
 509 $SY [$LB8NonBreaks-$CM];
 510
 511 # Rule 13 & 14 taken together for an edge case.
 512 #   Match this, shown forward
 513 #     OP SP+  ($CM+ behaving as $AL) (CL | CP | EX | IS | IY)
 514 #   This really wants to chain at the $CM+ (which is acting as an $AL)
 515 #   except for $CM chaining being disabled.
 516 [$CL $CP $EX $IS $SY] $CM+ $SP+ $CM* $OP;
 517
 518 # LB 14    OP SP* x
 519 #
 520 $CM* $CAN_CM    $SP* $CM* $OP;
 521      $CANT_CM   $SP* $CM* $OP;
 522 $AL_FOLLOW? $CM+  $SP $SP* $CM* $OP;     #  by LB 10, behaves like $AL_FOLLOW? $AL $SP* $CM* $OP
 523
 524      $AL_FOLLOW_NOCM $CM+ $SP+ $CM* $OP;
 525 $CM* $AL_FOLLOW_CM   $CM+ $SP+ $CM* $OP;
 526 $SY $CM $SP+ $OP;   # TODO:  Experiment.  Remove.
 527
 528
 529
 530 # LB 15
 531 $CM* $OP $SP* $CM* $QU;
 532
 533 # LB 16
 534 $CM* $NS $SP* $CM* ($CL | $CP);
 535
 536 # LB 17
 537 $CM* $B2 $SP* $CM* $B2;
 538
 539 # LB 18  break after spaces
 540 #        Nothing explicit needed here.
 541
 542
 543 #
 544 # LB 19
 545 #
 546 $CM* $QU $CM* $CAN_CM;                                #   . x QU
 547 $CM* $QU      $LB18NonBreaks;
 548
 549
 550 $CM* $CAN_CM  $CM* $QU;                               #   QU x .
 551      $CANT_CM $CM* $QU;
 552
 553 #
 554 #  LB 20  Break before and after CB.
 555 #         nothing needed here.
 556 #
 557
 558 # LB 20.09 added rule for Finnish tailoring
 559 $AL ($HY | $HH) / $SP;
 560
 561 # LB 21
 562 $CM* ($BA | $HH | $HY | $NS) $CM* [$LB20NonBreaks-$CM];     #  . x (BA | HY | NS)
 563
 564 $CM* [$LB20NonBreaks-$CM] $CM* $BB;                   #  BB x .
 565 [^$CB] $CM* $BB;                                      #
 566
 567
 568
 569 # LB 22
 570 $CM* $IN $CM* $ALPlus;
 571 $CM* $IN $CM* $ID;
 572 $CM* $IN $CM* $IN;
 573 $CM* $IN $CM* $NU;
 574
 575 # LB 23
 576 $CM* $PO $CM* $ID;
 577 $CM* $NU $CM* $ALPlus;
 578 $CM* $ALPlus $CM* $NU;
 579
 580 # LB 24
 581 $CM* $ID $CM* $PR;
 582 $CM* $ALPlus $CM* $PR;
 583 $CM* $ALPlus $CM* $PO;
 584
 585
 586 # LB 25
 587 ($CM* ($PR | $PO))? ($CM* ($CL | $CP))? ($CM* ($NU | $IS | $SY))* $CM* $NU ($CM* ($OP | $HY))? ($CM* ($PR | $PO))?;
 588
 589 # LB 26
 590 $CM* ($H3 | $H2 | $JV | $JL) $CM* $JL;
 591 $CM* ($JT | $JV) $CM* ($H2 | $JV);
 592 $CM* $JT $CM* ($H3 | $JT);
 593
 594 # LB 27
 595 $CM* $IN $CM* ($H3 | $H2 | $JT | $JV | $JL);
 596 $CM* $PO $CM* ($H3 | $H2 | $JT | $JV | $JL);
 597 $CM* ($H3 | $H2 | $JT | $JV | $JL) $CM* $PR;
 598
 599 # LB 28
 600 $CM* $ALPlus $CM* $ALPlus;
 601
 602
 603 # LB 29
 604 $CM* $ALPlus $CM* $IS;
 605
 606 # LB 30
 607 $CM* $OP $CM* ($ALPlus | $NU);
 608 $CM* ($ALPlus | $NU) $CM* $CP;
 609
 610
 611 ## -------------------------------------------------
 612
 613 !!safe_reverse;
 614
 615 # LB 9
 616 $CM+ [^$CM $BK $CR $LF $NL $ZW $SP];
 617 $CM+ $SP / .;
 618
 619 # LB 14
 620 $SP+ $CM* $OP;
 621
 622 # LB 15
 623 $SP+ $CM* $QU;
 624
 625 # LB 16
 626 $SP+ $CM* ($CL | $CP);
 627
 628 # LB 17
 629 $SP+ $CM* $B2;
 630
 631 # LB 25
 632 ($CM* ($IS | $SY))+ $CM* $NU;
 633 ($CL | $CP) $CM* ($NU | $IS | $SY);
 634
 635 # For dictionary-based break
 636 $dictionary $dictionary;
 637
 638 ## -------------------------------------------------
 639
 640 !!safe_forward;
 641
 642 # Skip forward over all character classes that are involved in
 643 #   rules containing patterns with possibly more than one char
 644 #   of context.
 645 #
 646 #  It might be slightly more efficient to have specific rules
 647 #  instead of one generic one, but only if we could
 648 #  turn off rule chaining.  We don't want to move more
 649 #  than necessary.
 650 #
 651 [$CM $OP $QU $CL $CP $B2 $PR $HY $SP $dictionary]+ [^$CM $OP $QU $CL $CP $B2 $PR $HY $dictionary];
 652 $dictionary $dictionary;
 653