1 # Copyright (c) 2002-2015 International Business Machines Corporation and 2 # others. All Rights Reserved. 3 # 4 # file: line_normal.txt 5 # 6 # Line Breaking Rules 7 # Implement default line breaking as defined by 8 # Unicode Standard Annex #14 Revision 34 for Unicode 8.0 9 # http://www.unicode.org/reports/tr14/ 10 # tailored as noted in 2nd paragraph below.. 11 # 12 # TODO: Rule LB 8 remains as it was in Unicode 5.2 13 # This is only because of a limitation of ICU break engine implementation, 14 # not because the older behavior is desirable. 15 # 16 # This tailors the line break behavior to correspond to CSS 17 # line-break=normal (BCP47 -u-lb-normal) as defined for languages other than 18 # Chinese & Japanese. 19 # It sets characters of class CJ to behave like ID. 20 21 # 22 # Character Classes defined by TR 14. 23 # 24 25 !!chain; 26 !!LBCMNoChain; 27 28 29 !!lookAheadHardBreak; 30 # 31 # !!lookAheadHardBreak Described here because it is (as yet) undocumented elsewhere 32 # and only used for the line break rules. 33 # 34 # It is used in the implementation of rule LB 10 35 # which says to treat any combining mark that is not attached to a base 36 # character as if it were of class AL (alphabetic). 37 # 38 # The problem occurs in the reverse rules. 39 # 40 # Consider a sequence like, with correct breaks as shown 41 # LF ID CM AL AL 42 # ^ ^ ^ 43 # Then consider the sequence without the initial ID (ideographic) 44 # LF CM AL AL 45 # ^ ^ 46 # Our CM, which in the first example was attached to the ideograph, 47 # is now unattached, becomes an alpha, and joins in with the other 48 # alphas. 49 # 50 # When iterating forwards, these sequences do not present any problems 51 # When iterating backwards, we need to look ahead when encountering 52 # a CM to see whether it attaches to something further on or not. 53 # (Look-ahead in a reverse rule is looking towards the start) 54 # 55 # If the CM is unattached, we need to force a break. 56 # 57 # !!lookAheadHardBreak forces the run time state machine to 58 # stop immediately when a look ahead rule ( '/' operator) matches, 59 # and set the match position to that of the look-ahead operator, 60 # no matter what other rules may be in play at the time. 61 # 62 # See rule LB 19 for an example. 63 # 64 65 $AI = [:LineBreak = Ambiguous:]; 66 $AL = [:LineBreak = Alphabetic:]; 67 $BA = [:LineBreak = Break_After:]; 68 $BB = [:LineBreak = Break_Before:]; 69 $BK = [:LineBreak = Mandatory_Break:]; 70 $B2 = [:LineBreak = Break_Both:]; 71 $CB = [:LineBreak = Contingent_Break:]; 72 $CJ = [:LineBreak = Conditional_Japanese_Starter:]; 73 $CL = [:LineBreak = Close_Punctuation:]; 74 $CM = [:LineBreak = Combining_Mark:]; 75 $CP = [:LineBreak = Close_Parenthesis:]; 76 $CR = [:LineBreak = Carriage_Return:]; 77 $EX = [:LineBreak = Exclamation:]; 78 $GL = [:LineBreak = Glue:]; 79 $HL = [:LineBreak = Hebrew_Letter:]; 80 $HY = [:LineBreak = Hyphen:]; 81 $H2 = [:LineBreak = H2:]; 82 $H3 = [:LineBreak = H3:]; 83 $ID = [[:LineBreak = Ideographic:] $CJ]; 84 $IN = [:LineBreak = Inseperable:]; 85 $IS = [:LineBreak = Infix_Numeric:]; 86 $JL = [:LineBreak = JL:]; 87 $JV = [:LineBreak = JV:]; 88 $JT = [:LineBreak = JT:]; 89 $LF = [:LineBreak = Line_Feed:]; 90 $NL = [:LineBreak = Next_Line:]; 91 $NS = [:LineBreak = Nonstarter:]; 92 $NU = [:LineBreak = Numeric:]; 93 $OP = [:LineBreak = Open_Punctuation:]; 94 $PO = [:LineBreak = Postfix_Numeric:]; 95 $PR = [:LineBreak = Prefix_Numeric:]; 96 $QU = [:LineBreak = Quotation:]; 97 $RI = [:LineBreak = Regional_Indicator:]; 98 $SA = [:LineBreak = Complex_Context:]; 99 $SG = [:LineBreak = Surrogate:]; 100 $SP = [:LineBreak = Space:]; 101 $SY = [:LineBreak = Break_Symbols:]; 102 $WJ = [:LineBreak = Word_Joiner:]; 103 $XX = [:LineBreak = Unknown:]; 104 $ZW = [:LineBreak = ZWSpace:]; 105 106 # Dictionary character set, for triggering language-based break engines. Currently 107 # limited to LineBreak=Complex_Context. Note that this set only works in Unicode 108 # 5.0 or later as the definition of Complex_Context was corrected to include all 109 # characters requiring dictionary break. 110 111 $dictionary = [:LineBreak = Complex_Context:]; 112 113 # 114 # Rule LB1. By default, treat AI (characters with ambiguous east Asian width), 115 # SA (South East Asian: Thai, Lao, Khmer) 116 # SG (Unpaired Surrogates) 117 # XX (Unknown, unassigned) 118 # as $AL (Alphabetic) 119 # 120 $ALPlus = [$AL $AI $SA $SG $XX]; 121 122 # 123 # Combining Marks. X $CM* behaves as if it were X. Rule LB6. 124 # 125 $ALcm = $ALPlus $CM*; 126 $BAcm = $BA $CM*; 127 $BBcm = $BB $CM*; 128 $B2cm = $B2 $CM*; 129 $CLcm = $CL $CM*; 130 $CPcm = $CP $CM*; 131 $EXcm = $EX $CM*; 132 $GLcm = $GL $CM*; 133 $HLcm = $HL $CM*; 134 $HYcm = $HY $CM*; 135 $H2cm = $H2 $CM*; 136 $H3cm = $H3 $CM*; 137 $IDcm = $ID $CM*; 138 $INcm = $IN $CM*; 139 $IScm = $IS $CM*; 140 $JLcm = $JL $CM*; 141 $JVcm = $JV $CM*; 142 $JTcm = $JT $CM*; 143 $NScm = $NS $CM*; 144 $NUcm = $NU $CM*; 145 $OPcm = $OP $CM*; 146 $POcm = $PO $CM*; 147 $PRcm = $PR $CM*; 148 $QUcm = $QU $CM*; 149 $RIcm = $RI $CM*; 150 $SYcm = $SY $CM*; 151 $WJcm = $WJ $CM*; 152 153 ## ------------------------------------------------- 154 155 !!forward; 156 157 # 158 # Each class of character can stand by itself as an unbroken token, with trailing combining stuff 159 # 160 $ALPlus $CM+; 161 $BA $CM+; 162 $BB $CM+; 163 $B2 $CM+; 164 $CL $CM+; 165 $CP $CM+; 166 $EX $CM+; 167 $GL $CM+; 168 $HL $CM+; 169 $HY $CM+; 170 $H2 $CM+; 171 $H3 $CM+; 172 $ID $CM+; 173 $IN $CM+; 174 $IS $CM+; 175 $JL $CM+; 176 $JV $CM+; 177 $JT $CM+; 178 $NS $CM+; 179 $NU $CM+; 180 $OP $CM+; 181 $PO $CM+; 182 $PR $CM+; 183 $QU $CM+; 184 $RI $CM+; 185 $SY $CM+; 186 $WJ $CM+; 187 188 # 189 # CAN_CM is the set of characters that may combine with CM combining chars. 190 # Note that Linebreak UAX 14's concept of a combining char and the rules 191 # for what they can combine with are _very_ different from the rest of Unicode. 192 # 193 # Note that $CM itself is left out of this set. If CM is needed as a base 194 # it must be listed separately in the rule. 195 # 196 $CAN_CM = [^$SP $BK $CR $LF $NL $ZW $CM]; # Bases that can take CMs 197 $CANT_CM = [ $SP $BK $CR $LF $NL $ZW $CM]; # Bases that can't take CMs 198 199 # 200 # AL_FOLLOW set of chars that can unconditionally follow an AL 201 # Needed in rules where stand-alone $CM s are treated as AL. 202 # Chaining is disabled with CM because it causes other failures, 203 # so for this one case we need to manually list out longer sequences. 204 # 205 $AL_FOLLOW_NOCM = [$BK $CR $LF $NL $ZW $SP]; 206 $AL_FOLLOW_CM = [$CL $CP $EX $HL $IS $SY $WJ $GL $OP $QU $BA $HY $NS $IN $NU $ALPlus]; 207 $AL_FOLLOW = [$AL_FOLLOW_NOCM $AL_FOLLOW_CM]; 208 209 210 # 211 # Rule LB 4, 5 Mandatory (Hard) breaks. 212 # 213 $LB4Breaks = [$BK $CR $LF $NL]; 214 $LB4NonBreaks = [^$BK $CR $LF $NL]; 215 $CR $LF {100}; 216 217 # 218 # LB 6 Do not break before hard line breaks. 219 # 220 $LB4NonBreaks? $LB4Breaks {100}; # LB 5 do not break before hard breaks. 221 $CAN_CM $CM* $LB4Breaks {100}; 222 $CM+ $LB4Breaks {100}; 223 224 # LB 7 x SP 225 # x ZW 226 $LB4NonBreaks [$SP $ZW]; 227 $CAN_CM $CM* [$SP $ZW]; 228 $CM+ [$SP $ZW]; 229 230 # 231 # LB 8 Break after zero width space 232 # TODO: ZW SP* <break> 233 # An engine change is required to write the reverse rule for this. 234 # For now, leave the Unicode 5.2 rule, ZW <break> 235 # 236 $LB8Breaks = [$LB4Breaks $ZW]; 237 $LB8NonBreaks = [[$LB4NonBreaks] - [$ZW]]; 238 239 240 # LB 9 Combining marks. X $CM needs to behave like X, where X is not $SP, $BK $CR $LF $NL 241 # $CM not covered by the above needs to behave like $AL 242 # See definition of $CAN_CM. 243 244 $CAN_CM $CM+; # Stick together any combining sequences that don't match other rules. 245 $CM+; 246 247 # 248 # LB 11 Do not break before or after WORD JOINER & related characters. 249 # 250 $CAN_CM $CM* $WJcm; 251 $LB8NonBreaks $WJcm; 252 $CM+ $WJcm; 253 254 $WJcm $CANT_CM; 255 $WJcm $CAN_CM $CM*; 256 257 # 258 # LB 12 Do not break after NBSP and related characters. 259 # GL x 260 # 261 $GLcm $CAN_CM $CM*; 262 $GLcm $CANT_CM; 263 264 # 265 # LB 12a Do not break before NBSP and related characters ... 266 # [^SP BA HY] x GL 267 # 268 [[$LB8NonBreaks] - [$SP $BA $HY]] $CM* $GLcm; 269 $CM+ GLcm; 270 271 272 273 # 274 # LB 13 Don't break before ']' or '!' or ';' or '/', even after spaces. 275 # 276 $LB8NonBreaks $CL; 277 $CAN_CM $CM* $CL; 278 $CM+ $CL; # by rule 10, stand-alone CM behaves as AL 279 280 $LB8NonBreaks $CP; 281 $CAN_CM $CM* $CP; 282 $CM+ $CP; # by rule 10, stand-alone CM behaves as AL 283 284 $LB8NonBreaks $EX; 285 $CAN_CM $CM* $EX; 286 $CM+ $EX; # by rule 10, stand-alone CM behaves as AL 287 288 $LB8NonBreaks $IS; 289 $CAN_CM $CM* $IS; 290 $CM+ $IS; # by rule 10, stand-alone CM behaves as AL 291 292 $LB8NonBreaks $SY; 293 $CAN_CM $CM* $SY; 294 $CM+ $SY; # by rule 10, stand-alone CM behaves as AL 295 296 297 # 298 # LB 14 Do not break after OP, even after spaces 299 # 300 $OPcm $SP* $CAN_CM $CM*; 301 $OPcm $SP* $CANT_CM; 302 303 $OPcm $SP+ $CM+ $AL_FOLLOW?; # by rule 10, stand-alone CM behaves as AL 304 305 # LB 15 306 $QUcm $SP* $OPcm; 307 308 # LB 16 309 ($CLcm | $CPcm) $SP* $NScm; 310 311 # LB 17 312 $B2cm $SP* $B2cm; 313 314 # 315 # LB 18 Break after spaces. 316 # 317 $LB18NonBreaks = [$LB8NonBreaks - [$SP]]; 318 $LB18Breaks = [$LB8Breaks $SP]; 319 320 321 # LB 19 322 # x QU 323 $LB18NonBreaks $CM* $QUcm; 324 $CM+ $QUcm; 325 326 # QU x 327 $QUcm .?; 328 $QUcm $LB18NonBreaks $CM*; # Don't let a combining mark go onto $CR, $BK, etc. 329 # TODO: I don't think this rule is needed. 330 331 332 # LB 20 333 # <break> $CB 334 # $CB <break> 335 336 $LB20NonBreaks = [$LB18NonBreaks - $CB]; 337 338 # LB 21 x (BA | HY | NS) 339 # BB x 340 # 341 $LB20NonBreaks $CM* ($BAcm | $HYcm | $NScm); 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 | $BAcm) [^$CB]?; 350 351 # LB 21b (forward) Don't break between SY and HL 352 # (break between HL and SY already disallowed by LB 13 above) 353 $SYcm $HLcm; 354 355 # LB 22 356 ($ALcm | $HLcm) $INcm; 357 $CM+ $INcm; # by rule 10, any otherwise unattached CM behaves as AL 358 $EXcm $INcm; 359 $IDcm $INcm; 360 $INcm $INcm; 361 $NUcm $INcm; 362 363 364 # $LB 23 365 $IDcm $POcm; 366 $ALcm $NUcm; # includes $LB19 367 $HLcm $NUcm; 368 $CM+ $NUcm; # Rule 10, any otherwise unattached CM behaves as AL 369 $NUcm $ALcm; 370 $NUcm $HLcm; 371 372 # 373 # LB 24 374 # 375 $PRcm $IDcm; 376 $PRcm ($ALcm | $HLcm); 377 $POcm ($ALcm | $HLcm); 378 379 # 380 # LB 25 Numbers. 381 # 382 ($PRcm | $POcm)? ($OPcm | $HYcm)? $NUcm ($NUcm | $SYcm | $IScm)* ($CLcm | $CPcm)? ($PRcm | $POcm)?; 383 384 # LB 26 Do not break a Korean syllable 385 # 386 $JLcm ($JLcm | $JVcm | $H2cm | $H3cm); 387 ($JVcm | $H2cm) ($JVcm | $JTcm); 388 ($JTcm | $H3cm) $JTcm; 389 390 # LB 27 Treat korean Syllable Block the same as ID (don't break it) 391 ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm) $INcm; 392 ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm) $POcm; 393 $PRcm ($JLcm | $JVcm | $JTcm | $H2cm | $H3cm); 394 395 396 # LB 28 Do not break between alphabetics 397 # 398 ($ALcm | $HLcm) ($ALcm | $HLcm); 399 $CM+ ($ALcm | $HLcm); # The $CM+ is from rule 10, an unattached CM is treated as AL 400 401 # LB 29 402 $IScm ($ALcm | $HLcm); 403 404 # LB 30 405 ($ALcm | $HLcm | $NUcm) $OPcm; 406 $CM+ $OPcm; # The $CM+ is from rule 10, an unattached CM is treated as AL. 407 $CPcm ($ALcm | $HLcm | $NUcm); 408 409 # LB 30a Do not break between regional indicators. 410 $RIcm $RIcm; 411 412 # 413 # Reverse Rules. 414 # 415 ## ------------------------------------------------- 416 417 !!reverse; 418 419 $CM+ $ALPlus; 420 $CM+ $BA; 421 $CM+ $BB; 422 $CM+ $B2; 423 $CM+ $CL; 424 $CM+ $CP; 425 $CM+ $EX; 426 $CM+ $GL; 427 $CM+ $HL; 428 $CM+ $HY; 429 $CM+ $H2; 430 $CM+ $H3; 431 $CM+ $ID; 432 $CM+ $IN; 433 $CM+ $IS; 434 $CM+ $JL; 435 $CM+ $JV; 436 $CM+ $JT; 437 $CM+ $NS; 438 $CM+ $NU; 439 $CM+ $OP; 440 $CM+ $PO; 441 $CM+ $PR; 442 $CM+ $QU; 443 $CM+ $RI; 444 $CM+ $SY; 445 $CM+ $WJ; 446 $CM+; 447 448 449 # 450 # Sequences of the form (shown forwards) 451 # [CANT_CM] <break> [CM] [whatever] 452 # The CM needs to behave as an AL 453 # 454 $AL_FOLLOW $CM+ / ( 455 [$BK $CR $LF $NL $ZW {eof}] | 456 $SP+ $CM+ $SP | 457 $SP+ $CM* ([^$OP $CM $SP] | [$AL {eof}])); # if LB 14 will match, need to surpress this break. 458 # LB14 says OP SP* x . 459 # becomes OP SP* x AL 460 # becomes OP SP* x CM+ AL_FOLLOW 461 # 462 # Further note: the $AL in [$AL {eof}] is only to work around 463 # a rule compiler bug which complains about 464 # empty sets otherwise. 465 466 # 467 # Sequences of the form (shown forwards) 468 # [CANT_CM] <break> [CM] <break> [PR] 469 # The CM needs to behave as an AL 470 # This rule is concerned about getting the second of the two <breaks> in place. 471 # 472 473 [$PR ] / $CM+ [$BK $CR $LF $NL $ZW $SP {eof}]; 474 475 476 477 # LB 4, 5, 5 478 479 $LB4Breaks [$LB4NonBreaks-$CM]; 480 $LB4Breaks $CM+ $CAN_CM; 481 $LF $CR; 482 483 484 # LB 7 x SP 485 # x ZW 486 [$SP $ZW] [$LB4NonBreaks-$CM]; 487 [$SP $ZW] $CM+ $CAN_CM; 488 489 # LB 8 ZW SP* <break> 490 # TODO: to implement this, we need more than one look-ahead hard break in play at a time. 491 # Requires an engine enhancement. 492 # / $SP* $ZW 493 494 # LB 9,10 Combining marks. 495 # X $CM needs to behave like X, where X is not $SP or controls. 496 # $CM not covered by the above needs to behave like $AL 497 # Stick together any combining sequences that don't match other rules. 498 $CM+ $CAN_CM; 499 500 501 # LB 11 502 $CM* $WJ $CM* $CAN_CM; 503 $CM* $WJ [$LB8NonBreaks-$CM]; 504 505 $CANT_CM $CM* $WJ; 506 $CM* $CAN_CM $CM* $WJ; 507 508 # LB 12a 509 # [^SP BA HY] x GL 510 # 511 $CM* $GL $CM* [$LB8NonBreaks-[$CM $SP $BA $HY]]; 512 513 # LB 12 514 # GL x 515 # 516 $CANT_CM $CM* $GL; 517 $CM* $CAN_CM $CM* $GL; 518 519 520 # LB 13 521 $CL $CM+ $CAN_CM; 522 $CP $CM+ $CAN_CM; 523 $EX $CM+ $CAN_CM; 524 $IS $CM+ $CAN_CM; 525 $SY $CM+ $CAN_CM; 526 527 $CL [$LB8NonBreaks-$CM]; 528 $CP [$LB8NonBreaks-$CM]; 529 $EX [$LB8NonBreaks-$CM]; 530 $IS [$LB8NonBreaks-$CM]; 531 $SY [$LB8NonBreaks-$CM]; 532 533 # Rule 13 & 14 taken together for an edge case. 534 # Match this, shown forward 535 # OP SP+ ($CM+ behaving as $AL) (CL | CP | EX | IS | IY) 536 # This really wants to chain at the $CM+ (which is acting as an $AL) 537 # except for $CM chaining being disabled. 538 [$CL $CP $EX $IS $SY] $CM+ $SP+ $CM* $OP; 539 540 # LB 14 OP SP* x 541 # 542 $CM* $CAN_CM $SP* $CM* $OP; 543 $CANT_CM $SP* $CM* $OP; 544 $AL_FOLLOW? $CM+ $SP $SP* $CM* $OP; # by LB 10, behaves like $AL_FOLLOW? $AL $SP* $CM* $OP 545 546 $AL_FOLLOW_NOCM $CM+ $SP+ $CM* $OP; 547 $CM* $AL_FOLLOW_CM $CM+ $SP+ $CM* $OP; 548 $SY $CM $SP+ $OP; # TODO: Experiment. Remove. 549 550 551 552 # LB 15 553 $CM* $OP $SP* $CM* $QU; 554 555 # LB 16 556 $CM* $NS $SP* $CM* ($CL | $CP); 557 558 # LB 17 559 $CM* $B2 $SP* $CM* $B2; 560 561 # LB 18 break after spaces 562 # Nothing explicit needed here. 563 564 565 # 566 # LB 19 567 # 568 $CM* $QU $CM* $CAN_CM; # . x QU 569 $CM* $QU $LB18NonBreaks; 570 571 572 $CM* $CAN_CM $CM* $QU; # QU x . 573 $CANT_CM $CM* $QU; 574 575 # 576 # LB 20 Break before and after CB. 577 # nothing needed here. 578 # 579 580 # LB 21 581 $CM* ($BA | $HY | $NS) $CM* [$LB20NonBreaks-$CM]; # . x (BA | HY | NS) 582 583 $CM* [$LB20NonBreaks-$CM] $CM* $BB; # BB x . 584 [^$CB] $CM* $BB; # 585 586 # LB21a 587 [^$CB] $CM* ($HY | $BA) $CM* $HL; 588 589 # LB21b (reverse) 590 $CM* $HL $CM* $SY; 591 592 # LB 22 593 $CM* $IN $CM* ($ALPlus | $HL); 594 $CM* $IN $CM* $EX; 595 $CM* $IN $CM* $ID; 596 $CM* $IN $CM* $IN; 597 $CM* $IN $CM* $NU; 598 599 # LB 23 600 $CM* $PO $CM* $ID; 601 $CM* $NU $CM* ($ALPlus | $HL); 602 $CM* ($ALPlus | $HL) $CM* $NU; 603 604 # LB 24 605 $CM* $ID $CM* $PR; 606 $CM* ($ALPlus | $HL) $CM* $PR; 607 $CM* ($ALPlus | $HL) $CM* $PO; 608 609 610 # LB 25 611 ($CM* ($PR | $PO))? ($CM* ($CL | $CP))? ($CM* ($NU | $IS | $SY))* $CM* $NU ($CM* ($OP | $HY))? ($CM* ($PR | $PO))?; 612 613 # LB 26 614 $CM* ($H3 | $H2 | $JV | $JL) $CM* $JL; 615 $CM* ($JT | $JV) $CM* ($H2 | $JV); 616 $CM* $JT $CM* ($H3 | $JT); 617 618 # LB 27 619 $CM* $IN $CM* ($H3 | $H2 | $JT | $JV | $JL); 620 $CM* $PO $CM* ($H3 | $H2 | $JT | $JV | $JL); 621 $CM* ($H3 | $H2 | $JT | $JV | $JL) $CM* $PR; 622 623 # LB 28 624 $CM* ($ALPlus | $HL) $CM* ($ALPlus | $HL); 625 626 627 # LB 29 628 $CM* ($ALPlus | $HL) $CM* $IS; 629 630 # LB 30 631 $CM* $OP $CM* ($ALPlus | $HL | $NU); 632 $CM* ($ALPlus | $HL | $NU) $CM* $CP; 633 634 # LB 30a 635 $CM* $RI $CM* $RI; 636 637 ## ------------------------------------------------- 638 639 !!safe_reverse; 640 641 # LB 9 642 $CM+ [^$CM $BK $CR $LF $NL $ZW $SP]; 643 $CM+ $SP / .; 644 645 # LB 14 646 $SP+ $CM* $OP; 647 648 # LB 15 649 $SP+ $CM* $QU; 650 651 # LB 16 652 $SP+ $CM* ($CL | $CP); 653 654 # LB 17 655 $SP+ $CM* $B2; 656 657 # LB 21 658 $CM* ($HY | $BA) $CM* $HL; 659 660 # LB 25 661 ($CM* ($IS | $SY))+ $CM* $NU; 662 ($CL | $CP) $CM* ($NU | $IS | $SY); 663 664 # For dictionary-based break 665 $dictionary $dictionary; 666 667 ## ------------------------------------------------- 668 669 !!safe_forward; 670 671 # Skip forward over all character classes that are involved in 672 # rules containing patterns with possibly more than one char 673 # of context. 674 # 675 # It might be slightly more efficient to have specific rules 676 # instead of one generic one, but only if we could 677 # turn off rule chaining. We don't want to move more 678 # than necessary. 679 # 680 [$CM $OP $QU $CL $CP $B2 $PR $HY $BA $SP $dictionary]+ [^$CM $OP $QU $CL $CP $B2 $PR $HY $BA $dictionary]; 681 $dictionary $dictionary; 682 683