projects / apple / icu.git / blame
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| 2 | #***************************************************************************** | |
| 3 | # | |
| 4 | # Copyright (C) 2002-2003, International Business Machines Corporation and others. | |
| 5 | # All Rights Reserved. | |
| 6 | # | |
| 7 | #***************************************************************************** | |
| 8 | # | |
| 9 | # file: regexcst.txt | |
| 10 | # ICU Regular Expression Parser State Table | |
| 11 | # | |
| 12 | # This state table is used when reading and parsing a regular expression pattern | |
| 13 | # The pattern parser uses a state machine; the data in this file define the | |
| 14 | # state transitions that occur for each input character. | |
| 15 | # | |
| 16 | # *** This file defines the regex pattern grammar. This is it. | |
| 17 | # *** The determination of what is accepted is here. | |
| 18 | # | |
| 19 | # This file is processed by a perl script "regexcst.pl" to produce initialized C arrays | |
| 20 | # that are then built with the rule parser. | |
| 21 | # | |
| 22 | ||
| 23 | # | |
| 24 | # Here is the syntax of the state definitions in this file: | |
| 25 | # | |
| 26 | # | |
| 27 | #StateName: | |
| 28 | # input-char n next-state ^push-state action | |
| 29 | # input-char n next-state ^push-state action | |
| 30 | # | | | | | | |
| 31 | # | | | | |--- action to be performed by state machine | |
| 32 | # | | | | See function RBBIRuleScanner::doParseActions() | |
| 33 | # | | | | | |
| 34 | # | | | |--- Push this named state onto the state stack. | |
| 35 | # | | | Later, when next state is specified as "pop", | |
| 36 | # | | | the pushed state will become the current state. | |
| 37 | # | | | | |
| 38 | # | | |--- Transition to this state if the current input character matches the input | |
| 39 | # | | character or char class in the left hand column. "pop" causes the next | |
| 40 | # | | state to be popped from the state stack. | |
| 41 | # | | | |
| 42 | # | |--- When making the state transition specified on this line, advance to the next | |
| 43 | # | character from the input only if 'n' appears here. | |
| 44 | # | | |
| 45 | # |--- Character or named character classes to test for. If the current character being scanned | |
| 46 | # matches, peform the actions and go to the state specified on this line. | |
| 47 | # The input character is tested sequentally, in the order written. The characters and | |
| 48 | # character classes tested for do not need to be mutually exclusive. The first match wins. | |
| 49 | # | |
| 50 | ||
| 51 | ||
| 52 | ||
| 53 | ||
| 54 | # | |
| 55 | # start state, scan position is at the beginning of the pattern. | |
| 56 | # | |
| 57 | start: | |
| 58 | default term doPatStart | |
| 59 | ||
| 60 | ||
| 61 | ||
| 62 | ||
| 63 | # | |
| 64 | # term. At a position where we can accept the start most items in a pattern. | |
| 65 | # | |
| 66 | term: | |
| 67 | quoted n expr-quant doLiteralChar | |
| 68 | rule_char n expr-quant doLiteralChar | |
| 69 | '[' n expr-quant doScanUnicodeSet | |
| 70 | '(' n open-paren | |
| 71 | '.' n expr-quant doDotAny | |
| 72 | '^' n term doCaret | |
| 73 | '$' n term doDollar | |
| 74 | '\' n backslash | |
| 75 | '|' n term doOrOperator | |
| 76 | ')' n pop doCloseParen | |
| 77 | eof term doPatFinish | |
| 78 | default errorDeath doRuleError | |
| 79 | ||
| 80 | ||
| 81 | ||
| 82 | # | |
| 83 | # expr-quant We've just finished scanning a term, now look for the optional | |
| 84 | # trailing quantifier - *, +, ?, *?, etc. | |
| 85 | # | |
| 86 | expr-quant: | |
| 87 | '*' n quant-star | |
| 88 | '+' n quant-plus | |
| 89 | '?' n quant-opt | |
| 90 | '{' n interval-open doIntervalInit | |
| 91 | '(' n open-paren-quant | |
| 92 | default expr-cont | |
| 93 | ||
| 94 | ||
| 95 | # | |
| 96 | # expr-cont Expression, continuation. At a point where additional terms are | |
| 97 | # allowed, but not required. No Quantifiers | |
| 98 | # | |
| 99 | expr-cont: | |
| 100 | '|' n term doOrOperator | |
| 101 | ')' n pop doCloseParen | |
| 102 | default term | |
| 103 | ||
| 104 | ||
| 105 | # | |
| 106 | # open-paren-quant Special case handling for comments appearing before a quantifier, | |
| 107 | # e.g. x(?#comment )* | |
| 108 | # Open parens from expr-quant come here; anything but a (?# comment | |
| 109 | # branches into the normal parenthesis sequence as quickly as possible. | |
| 110 | # | |
| 111 | open-paren-quant: | |
| 112 | '?' n open-paren-quant2 doSuppressComments | |
| 113 | default open-paren | |
| 114 | ||
| 115 | open-paren-quant2: | |
| 116 | '#' n paren-comment ^expr-quant | |
| 117 | default open-paren-extended | |
| 118 | ||
| 119 | ||
| 120 | # | |
| 121 | # open-paren We've got an open paren. We need to scan further to | |
| 122 | # determine what kind of quantifier it is - plain (, (?:, (?>, or whatever. | |
| 123 | # | |
| 124 | open-paren: | |
| 125 | '?' n open-paren-extended doSuppressComments | |
| 126 | default term ^expr-quant doOpenCaptureParen | |
| 127 | ||
| 128 | open-paren-extended: | |
| 129 | ':' n term ^expr-quant doOpenNonCaptureParen # (?: | |
| 130 | '>' n term ^expr-quant doOpenAtomicParen # (?> | |
| 131 | '=' n term ^expr-cont doOpenLookAhead # (?= | |
| 132 | '!' n term ^expr-cont doOpenLookAheadNeg # (?! | |
| 133 | '<' n open-paren-lookbehind | |
| 134 | '#' n paren-comment ^term | |
| 135 | 'i' paren-flag doBeginMatchMode | |
| 136 | 'm' paren-flag doBeginMatchMode | |
| 137 | 's' paren-flag doBeginMatchMode | |
| 138 | 'x' paren-flag doBeginMatchMode | |
| 139 | '-' paren-flag doBeginMatchMode | |
| 140 | '(' n errorDeath doConditionalExpr | |
| 141 | '{' n errorDeath doPerlInline | |
| 142 | default errorDeath doBadOpenParenType | |
| 143 | ||
| 144 | open-paren-lookbehind: | |
| 145 | '=' n term ^expr-cont doOpenLookBehind # (?<= | |
| 146 | '!' n term ^expr-cont doOpenLookBehindNeg # (?<! | |
| 147 | default errorDeath doBadOpenParenType | |
| 148 | ||
| 149 | ||
| 150 | # | |
| 151 | # paren-comment We've got a (?# ... ) style comment. Eat pattern text till we get to the ')' | |
| 152 | # TODO: should parens nest here? Check what perl does. | |
| 153 | # | |
| 154 | paren-comment: | |
| 155 | ')' n pop | |
| 156 | eof errorDeath doMismatchedParenErr | |
| 157 | default n paren-comment | |
| 158 | ||
| 159 | # | |
| 160 | # paren-flag Scanned a (?ismx-ismx flag setting | |
| 161 | # | |
| 162 | paren-flag: | |
| 163 | 'i' n paren-flag doMatchMode | |
| 164 | 'm' n paren-flag doMatchMode | |
| 165 | 's' n paren-flag doMatchMode | |
| 166 | 'x' n paren-flag doMatchMode | |
| 167 | '-' n paren-flag doMatchMode | |
| 168 | ')' n term doSetMatchMode | |
| 169 | ':' n term ^expr-quant doMatchModeParen | |
| 170 | default errorDeath | |
| 171 | ||
| 172 | ||
| 173 | # | |
| 174 | # quant-star Scanning a '*' quantifier. Need to look ahead to decide | |
| 175 | # between plain '*', '*?', '*+' | |
| 176 | # | |
| 177 | quant-star: | |
| 178 | '?' n expr-cont doNGStar # *? | |
| 179 | '+' n expr-cont doPossessiveStar # *+ | |
| 180 | default expr-cont doStar | |
| 181 | ||
| 182 | ||
| 183 | # | |
| 184 | # quant-plus Scanning a '+' quantifier. Need to look ahead to decide | |
| 185 | # between plain '+', '+?', '++' | |
| 186 | # | |
| 187 | quant-plus: | |
| 188 | '?' n expr-cont doNGPlus # *? | |
| 189 | '+' n expr-cont doPossessivePlus # *+ | |
| 190 | default expr-cont doPlus | |
| 191 | ||
| 192 | ||
| 193 | # | |
| 194 | # quant-opt Scanning a '?' quantifier. Need to look ahead to decide | |
| 195 | # between plain '?', '??', '?+' | |
| 196 | # | |
| 197 | quant-opt: | |
| 198 | '?' n expr-cont doNGOpt # ?? | |
| 199 | '+' n expr-cont doPossessiveOpt # ?+ | |
| 200 | default expr-cont doOpt # ? | |
| 201 | ||
| 202 | ||
| 203 | # | |
| 204 | # Interval scanning a '{', the opening delimiter for an interval specification | |
| 205 | # {number} or {min, max} or {min, } | |
| 206 | # | |
| 207 | interval-open: | |
| 208 | white_space n interval-open # TODO: is white space allowed here in non-free mode? | |
| 209 | digit_char interval-lower | |
| 210 | default errorDeath doIntervalError | |
| 211 | ||
| 212 | interval-lower: | |
| 213 | digit_char n interval-lower doIntevalLowerDigit | |
| 214 | ',' n interval-upper | |
| 215 | '}' n interval-type doIntervalSame # {n} | |
| 216 | default errorDeath doIntervalError | |
| 217 | ||
| 218 | interval-upper: | |
| 219 | digit_char n interval-upper doIntervalUpperDigit | |
| 220 | '}' n interval-type | |
| 221 | default errorDeath doIntervalError | |
| 222 | ||
| 223 | interval-type: | |
| 224 | '?' n expr-cont doNGInterval # {n,m}? | |
| 225 | '+' n expr-cont doPossessiveInterval # {n,m}+ | |
| 226 | default expr-cont doInterval # {m,n} | |
| 227 | ||
| 228 | ||
| 229 | # | |
| 230 | # backslash # Backslash. Figure out which of the \thingies we have encountered. | |
| 231 | # The low level next-char function will have preprocessed | |
| 232 | # some of them already; those won't come here. | |
| 233 | backslash: | |
| 234 | 'A' n term doBackslashA | |
| 235 | 'B' n term doBackslashB | |
| 236 | 'b' n term doBackslashb | |
| 237 | 'd' n expr-quant doBackslashd | |
| 238 | 'D' n expr-quant doBackslashD | |
| 239 | 'G' n term doBackslashG | |
| 240 | 'N' expr-quant doProperty # \N{NAME} named char | |
| 241 | 'p' expr-quant doProperty # \p{Lu} style property | |
| 242 | 'P' expr-quant doProperty | |
| 243 | 'Q' n term doEnterQuoteMode | |
| 244 | 'S' n expr-quant doBackslashS | |
| 245 | 's' n expr-quant doBackslashs | |
| 246 | 'W' n expr-quant doBackslashW | |
| 247 | 'w' n expr-quant doBackslashw | |
| 248 | 'X' n expr-quant doBackslashX | |
| 249 | 'Z' n term doBackslashZ | |
| 250 | 'z' n term doBackslashz | |
| 251 | '0' n expr-quant doOctal | |
| 252 | digit_char n expr-quant doBackRef # Will scan multiple digits | |
| 253 | eof errorDeath doEscapeError | |
| 254 | default n expr-quant doLiteralChar # Escaped literal char. | |
| 255 | ||
| 256 | ||
| 257 | # | |
| 258 | # errorDeath. This state is specified as the next state whenever a syntax error | |
| 259 | # in the source rules is detected. Barring bugs, the state machine will never | |
| 260 | # actually get here, but will stop because of the action associated with the error. | |
| 261 | # But, just in case, this state asks the state machine to exit. | |
| 262 | errorDeath: | |
| 263 | default n errorDeath doExit | |
| 264 | ||
| 265 |