line_normal.txt (9128B)
1 # 2 # Copyright (C) 2016 and later: Unicode, Inc. and others. 3 # License & terms of use: http://www.unicode.org/copyright.html 4 # Copyright (c) 2016, International Business Machines Corporation and others. All Rights Reserved. 5 # 6 # file: line_normal.txt 7 # 8 # Reference Line Break rules for intltest rbbi/RBBIMonkeyTest. 9 # Rules derived from Unicode Standard Annex #14 for Unicode 16.0. 10 # 11 # Note: Rule syntax and the monkey test itself are still a work in progress. 12 # They are expected to change with review and the addition of support for rule tailoring. 13 # 14 # Line Breaking Rules 15 # Implement default line breaking as defined by 16 # Unicode Standard Annex #14 17 # http://www.unicode.org/reports/tr14/, tailored as noted below. 18 # 19 # This tailors the line break behavior to correspond to CSS 20 # line-break=normal (BCP47 -u-lb-normal) as defined for languages other than 21 # Chinese & Japanese. 22 # It sets characters of class CJ to behave like ID. 23 24 25 type = line; 26 locale = en@lb=normal; 27 28 AI = [:LineBreak = Ambiguous:]; 29 AK = [:LineBreak = Aksara:]; 30 AL = [:LineBreak = Alphabetic:]; 31 AP = [:LineBreak = Aksara_Prebase:]; 32 AS = [:LineBreak = Aksara_Start:]; 33 BA = [:LineBreak = Break_After:]; 34 HH = [:LineBreak = Unambiguous_Hyphen:]; 35 BB = [:LineBreak = Break_Before:]; 36 BK = [:LineBreak = Mandatory_Break:]; 37 B2 = [:LineBreak = Break_Both:]; 38 CB = [:LineBreak = Contingent_Break:]; 39 CJ = [:LineBreak = Conditional_Japanese_Starter:]; 40 CL = [:LineBreak = Close_Punctuation:]; 41 CMS = [:LineBreak = Combining_Mark:]; 42 CP = [:LineBreak = Close_Parenthesis:]; 43 CR = [:LineBreak = Carriage_Return:]; 44 EB = [:LineBreak = EB:]; 45 EM = [:LineBreak = EM:]; 46 EX = [:LineBreak = Exclamation:]; 47 GL = [:LineBreak = Glue:]; 48 HL = [:LineBreak = Hebrew_Letter:]; 49 HY = [:LineBreak = Hyphen:]; 50 H2 = [:LineBreak = H2:]; 51 H3 = [:LineBreak = H3:]; 52 ID = [[:LineBreak = Ideographic:] CJ]; # CSS Normal tailoring: CJ resolves to ID 53 IN = [:LineBreak = Inseperable:]; 54 IS = [:LineBreak = Infix_Numeric:]; 55 JL = [:LineBreak = JL:]; 56 JV = [:LineBreak = JV:]; 57 JT = [:LineBreak = JT:]; 58 LF = [:LineBreak = Line_Feed:]; 59 NL = [:LineBreak = Next_Line:]; 60 NS = [:LineBreak = Nonstarter:]; 61 NU = [:LineBreak = Numeric:]; 62 OP = [:LineBreak = Open_Punctuation:]; 63 PO = [:LineBreak = Postfix_Numeric:]; 64 PR = [:LineBreak = Prefix_Numeric:]; 65 QU = [:LineBreak = Quotation:]; 66 RI = [:LineBreak = Regional_Indicator:]; 67 SA = [:LineBreak = Complex_Context:]; 68 SG = [:LineBreak = Surrogate:]; 69 SP = [:LineBreak = Space:]; 70 SY = [:LineBreak = Break_Symbols:]; 71 VF = [:LineBreak = Virama_Final:]; 72 VI = [:LineBreak = Virama:]; 73 WJ = [:LineBreak = Word_Joiner:]; 74 XX = [:LineBreak = Unknown:]; 75 ZW = [:LineBreak = ZWSpace:]; 76 ZWJ = [:LineBreak = ZWJ:]; 77 78 # OP30 and CP30 are variants of OP and CP that appear in rule LB30 from UAX 14. 79 # Limitations of this monkey test rule parser require that these definitions be pulled out 80 # rather than appearing in-line in LB 30. 81 82 OP30 = [OP - [\p{ea=F}\p{ea=W}\p{ea=H}]]; 83 CP30 = [CP - [\p{ea=F}\p{ea=W}\p{ea=H}]]; 84 85 eaFWH = [\p{ea=F}\p{ea=W}\p{ea=H}]; 86 eaFWHminusCMOPGL = [ eaFWH - [CMS OP GL] ]; 87 eaFWHminusCM = [ eaFWH - CMS ]; 88 eaFWHBreakableAtLB19 = [ eaFWH - [NS BA EX CL IN IS GL CMS] ]; 89 BAminuseaFWH = [BA - eaFWH ]; 90 91 PiQU = [\p{Pi}&QU]; 92 PfQU = [\p{Pf}&QU]; 93 94 # The redundant-looking inner brackets are required for the current parser in the test code. 95 ExtPictUnassigned = [[\p{Extended_Pictographic}]&[\p{Cn}]]; 96 97 # LB1 - Resolve AI, CB, CJ, SA, SG, and XX into other line breaking classes 98 AL = [AL AI SG XX ]; 99 dictionary = SA; 100 101 # By LB9, a ZWJ also behaves as a CM. Including it in the definition of CM avoids having to explicitly 102 # list it in the numerous rules that use CM. 103 CM = [CMS ZWJ]; 104 105 LB4: BK ÷; 106 LB5: CR LF; 107 LB5.1: CR ÷; 108 LB5.2: LF ÷; 109 LB5.3: NL ÷; 110 111 LB6: . (BK | CR | LF | NL); 112 LB6.1: [^BK CR LF NL SP ZW] CM* (BK | CR | LF | NL); 113 114 # LB8 break after ZW SP*. 115 # Precedes LB7 because both rules will match the sequences like ZW SP, 116 # and LB8 must take precedence. 117 118 LB8: ZW SP* ÷ [^ZW SP BK CR LF NL]; 119 120 # Numbers. Equivalent to Tailoring example 8 from UAX 14. 121 # Moved up, before LB14, because it can match longer sequences which must take precedence. 122 LB25: ((PR | PO)CM*)? ((OP | HY)CM*)? (IS CM*)? NU (CM*(NU | SY | IS))* (CM*(CL | CP))? (CM*(PR | PO))?; 123 124 # Rules LB14 - LB17. 125 126 # Moved before LB14, because it matches a supersequence. 127 LB20a.3: ( OP CM* SP* | QU CM* | GL CM* ) (PiQU CM* SP*)+ SP (HY | HH) CM* (AL | HL); 128 LB15a.1: ( OP CM* SP* | QU CM* | GL CM* ) (PiQU CM* SP*)+ .; 129 130 # Moved before LB14. These are really the cases where LB19a does not apply, but 131 # the old LB19 would. This is to avoid many instances of chaining over two code 132 # points. 133 LB19a.1: eaFWHminusCMOPGL ÷ PiQU CM* eaFWHminusCM; 134 LB19a.2: eaFWHminusCMOPGL CM* CMS ÷ PiQU CM* eaFWHminusCM; 135 LB19a.5: eaFWHminusCM CM* PfQU ÷ eaFWHBreakableAtLB19; 136 LB19a.6: eaFWHminusCM CM* PfQU CM* CMS ÷ eaFWHBreakableAtLB19; 137 138 # Moved up, before LB7, because they can match a longer sequence that would also match LB7. 139 # For example, the sequence "OP CM SP AL" matches LB14 140 # while the prefix of it, "OP CM SP" matches LB7.1 141 LB20a.7: OP CM* SP+ (HY | HH) CM* (AL | HL); 142 LB14: OP CM* SP* .; 143 144 LB20a.4: ^ (PiQU CM* SP*)+ SP (HY | HH) CM* (AL | HL); 145 LB15a.2: ^ (PiQU CM* SP*)+ .; 146 # LB15b/LB15a chaining. 147 LB20a.5: ([^SP] CM* | SP) PfQU CM* (PiQU CM* SP*)+ SP (HY | HH) CM* (AL | HL); 148 LB15b.1: ([^SP] CM* | SP) PfQU CM* (PiQU CM* SP*)+ .; 149 LB15b.2: ([^SP] CM* | SP) PfQU CM* ( SP | GL | WJ | CL | QU | CP | EX | IS | SY | BK | CR | LF | NL | ZW | $ ); 150 151 # LB 15c Break before an IS that begins a number and follows a space. 152 LB15c: SP ÷ IS CM* NU; 153 154 # LB15d × IS 155 LB15d.1: [^SP] CM* IS; 156 LB15d.2: SP IS; 157 158 LB16: (CL | CP)CM* SP* NS; 159 LB17: B2 CM* SP* B2; 160 161 162 # LB7 Do not break before spaces or zero width space. 163 164 LB7.1: [^ZW SP] CM* [SP ZW]; 165 LB7.2: [ZW SP] [SP ZW]; 166 167 # LB8a 168 # ZWJ x 169 # Don't match a CM on the right - let other rules pick up CM sequences, where 170 # the ZWJ behaves as just another generic CM. 171 LB8a: ZWJ [^CM]; 172 173 174 # LB9: X CM -> X 175 # LB10: Unattached CM -> AL 176 177 #LB11: × WJ; 178 # WJ × 179 180 LB11.1: [^SP] CM* WJ; 181 LB11.2: SP WJ; 182 LB11.3: WJ CM* [^CM]; 183 184 # Needs to apply before LB12, because the new monkeys are not greedy. 185 LB20a.2: GL CM* (HY | HH) CM* (AL | HL); 186 LB12: GL CM* [^CM]; 187 188 LB12a: [^SP BA HY HH] CM* GL; 189 190 # LB 13 Do not break before ‘]’ or ‘!’ or ‘/’, even after spaces. 191 LB13.1: [^SP] CM* [CL CP EX SY]; 192 LB13.2: SP [CL CP EX SY]; 193 194 # LB 14-17 are moved above LB 7. 195 196 LB18: SP ÷; 197 198 LB19: . CM* QU; 199 LB19.1: QU CM* [^CM]; 200 201 # LB 20 Break before and after CB. 202 # Interaction with LB8a: ZWJ x . is tricky because CM includes ZWJ. 203 # ZWJ acts like a CM to the left, combining with CB. 204 # ZWJ acts independently to the right, no break after by LB8a. 205 LB20.1: . CM* ZWJ CB; 206 LB20.2: . CM* ÷ CB; 207 208 LB20a.6: CB CM* ZWJ (HY | HH) CM* (AL | HL); 209 LB20.3: CB CM* ZWJ [^CM]; 210 LB20.4: CB CM* ÷; 211 212 # LB 20a Do not break after a word-initial hyphen. 213 LB20a.1: ^(HY | HH) CM* (AL | HL); 214 215 # Note: Rule 21a must come before 21 to prevent 21.1 from matching HL BA, then 216 # not picking up the continuing match after the BA from 21a. 217 LB21a: HL CM* (HY | HH) CM* [^CM CB HL]; 218 219 LB21.1: . CM* [BA HY HH NS]; 220 LB21.2: BB CM* [^CM CB]; 221 222 LB21b: SY CM* HL; 223 224 LB22: . CM* IN; 225 226 LB23.1: (AL | HL | CM) CM* NU; 227 LB23.2: NU CM* (AL | HL); 228 229 LB23a.1: PR CM* (ID | EB | EM); 230 LB23a.2: (ID | EB | EM) CM* PO; 231 232 LB24.2: (PR | PO) CM* (AL | HL); 233 LB24.3: (AL | HL | CM) CM* (PR | PO); 234 235 236 LB26.1: JL CM* (JL | JV | H2 | H3); 237 LB26.2: (JV | H2) CM* (JV | JT); 238 LB26.3: (JT | H3) CM* JT; 239 240 LB27.1: (JL | JV | JT | H2 | H3) CM* PO; 241 LB27.2: PR CM* (JL | JV | JT | H2 | H3); 242 243 # LB28 Do not break between Alphabetics. 244 # Unattached (leading) CM treated as AL. 245 LB28: (AL | HL | CM)CM* (AL | HL); 246 247 LB28: (AP CM*)? (AS | AK | [◌] ) (CM* VI CM* (AK | [◌] ))* (CM* VI | ((CM* (AS | AK | [◌] ) )? CM* VF))?; 248 249 LB29: IS CM* (AL | HL); 250 251 # LB30 is adjusted for unattached leading CM being treated as AL. 252 LB30.1: (AL | CM | HL | NU) CM* OP30; 253 LB30.2: CP30 CM* (AL | HL | NU); 254 255 # LB30a keep pairs of RI together. 256 LB30a.1: RI CM* RI ÷ [^BK CR LF NL SP ZW WJ CL CP EX IS SY GL QU BA HH HY NS IN CM]; 257 LB30a.2: RI CM* RI CM* CMS ÷ [^BK CR LF NL SP ZW WJ CL CP EX IS SY GL QU BA HH HY NS IN CM]; 258 LB30a.3: RI CM* RI CM* [BK CR LF NL SP ZW WJ GL CL CP EX IS SY QU BA HH HY NS IN ZWJ]?; 259 260 # LB30b Do not break between Emoji Base (or potential emoji) and Emoji Modifier 261 LB30b.1: EB CM* EM; 262 LB30b.2: ExtPictUnassigned CM* EM; 263 264 # LB31 Break Everywhere Else. 265 # Include combining marks 266 LB31.1: . CM* ZWJ [^CM]; 267 LB31.2: . CM* ÷;