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| 1 | /* | ||
| 2 | * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.tools.jstat; | ||
| 27 | |||
| 28 | import java.io.*; | ||
| 29 | import java.util.*; | ||
| 30 | |||
| 31 | /** | ||
| 32 | * A class implementing a simple predictive parser for output format | ||
| 33 | * specification language for the jstat command. | ||
| 34 | * | ||
| 35 | * @author Brian Doherty | ||
| 36 | * @since 1.5 | ||
| 37 | */ | ||
| 38 | public class Parser { | ||
| 39 | |||
| 40 | private static boolean pdebug = Boolean.getBoolean("jstat.parser.debug"); | ||
| 41 | private static boolean ldebug = Boolean.getBoolean("jstat.lex.debug"); | ||
| 42 | |||
| 43 | private static final char OPENBLOCK = '{'; | ||
| 44 | private static final char CLOSEBLOCK = '}'; | ||
| 45 | private static final char DOUBLEQUOTE = '"'; | ||
| 46 | private static final char PERCENT_CHAR = '%'; | ||
| 47 | private static final char OPENPAREN = '('; | ||
| 48 | private static final char CLOSEPAREN = ')'; | ||
| 49 | |||
| 50 | private static final char OPERATOR_PLUS = '+'; | ||
| 51 | private static final char OPERATOR_MINUS = '-'; | ||
| 52 | private static final char OPERATOR_MULTIPLY = '*'; | ||
| 53 | private static final char OPERATOR_DIVIDE = '/'; | ||
| 54 | |||
| 55 | private static final String OPTION = "option"; | ||
| 56 | private static final String COLUMN = "column"; | ||
| 57 | private static final String DATA = "data"; | ||
| 58 | private static final String HEADER = "header"; | ||
| 59 | private static final String WIDTH = "width"; | ||
| 60 | private static final String FORMAT = "format"; | ||
| 61 | private static final String ALIGN = "align"; | ||
| 62 | private static final String SCALE = "scale"; | ||
| 63 | |||
| 64 | private static final String START = OPTION; | ||
| 65 | |||
| 66 | private static final Set scaleKeyWords = Scale.keySet(); | ||
| 67 | private static final Set alignKeyWords = Alignment.keySet(); | ||
| 68 | private static String[] otherKeyWords = { | ||
| 69 | OPTION, COLUMN, DATA, HEADER, WIDTH, FORMAT, ALIGN, SCALE | ||
| 70 | }; | ||
| 71 | |||
| 72 | private static char[] infixOps = { | ||
| 73 | OPERATOR_PLUS, OPERATOR_MINUS, OPERATOR_MULTIPLY, OPERATOR_DIVIDE | ||
| 74 | }; | ||
| 75 | |||
| 76 | private static char[] delimiters = { | ||
| 77 | OPENBLOCK, CLOSEBLOCK, PERCENT_CHAR, OPENPAREN, CLOSEPAREN | ||
| 78 | }; | ||
| 79 | |||
| 80 | |||
| 81 | private static Set<String> reservedWords; | ||
| 82 | |||
| 83 | private StreamTokenizer st; | ||
| 84 | private String filename; | ||
| 85 | private Token lookahead; | ||
| 86 | private Token previous; | ||
| 87 | private int columnCount; | ||
| 88 | private OptionFormat optionFormat; | ||
| 89 | |||
| 90 | public Parser(String filename) throws FileNotFoundException { | ||
| 91 | this.filename = filename; | ||
| 92 | Reader r = new BufferedReader(new FileReader(filename)); | ||
| 93 | } | ||
| 94 | |||
| 95 | public Parser(Reader r) { | ||
| 96 | st = new StreamTokenizer(r); | ||
| 97 | |||
| 98 | // allow both c++ style comments | ||
| 99 | st.ordinaryChar('/'); | ||
| 100 | st.wordChars('_','_'); | ||
| 101 | st.slashSlashComments(true); | ||
| 102 | st.slashStarComments(true); | ||
| 103 | |||
| 104 | reservedWords = new HashSet<String>(); | ||
| 105 | for (int i = 0; i < otherKeyWords.length; i++) { | ||
| 106 | reservedWords.add(otherKeyWords[i]); | ||
| 107 | } | ||
| 108 | |||
| 109 | for (int i = 0; i < delimiters.length; i++ ) { | ||
| 110 | st.ordinaryChar(delimiters[i]); | ||
| 111 | } | ||
| 112 | |||
| 113 | for (int i = 0; i < infixOps.length; i++ ) { | ||
| 114 | st.ordinaryChar(infixOps[i]); | ||
| 115 | } | ||
| 116 | } | ||
| 117 | |||
| 118 | /** | ||
| 119 | * push back the lookahead token and restore the lookahead token | ||
| 120 | * to the previous token. | ||
| 121 | */ | ||
| 122 | private void pushBack() { | ||
| 123 | lookahead = previous; | ||
| 124 | st.pushBack(); | ||
| 125 | } | ||
| 126 | |||
| 127 | /** | ||
| 128 | * retrieve the next token, placing the token value in the lookahead | ||
| 129 | * member variable, storing its previous value in the previous member | ||
| 130 | * variable. | ||
| 131 | */ | ||
| 132 | private void nextToken() throws ParserException, IOException { | ||
| 133 | int t = st.nextToken(); | ||
| 134 | previous = lookahead; | ||
| 135 | lookahead = new Token(st.ttype, st.sval, st.nval); | ||
| 136 | log(ldebug, "lookahead = " + lookahead); | ||
| 137 | } | ||
| 138 | |||
| 139 | /** | ||
| 140 | * match one of the token values in the given set of key words | ||
| 141 | * token is assumed to be of type TT_WORD, and the set is assumed | ||
| 142 | * to contain String objects. | ||
| 143 | */ | ||
| 144 | private Token matchOne(Set keyWords) throws ParserException, IOException { | ||
| 145 | if ((lookahead.ttype == StreamTokenizer.TT_WORD) | ||
| 146 | && keyWords.contains(lookahead.sval)) { | ||
| 147 | Token t = lookahead; | ||
| 148 | nextToken(); | ||
| 149 | return t; | ||
| 150 | } | ||
| 151 | throw new SyntaxException(st.lineno(), keyWords, lookahead); | ||
| 152 | } | ||
| 153 | |||
| 154 | /** | ||
| 155 | * match a token with TT_TYPE=type, and the token value is a given sequence | ||
| 156 | * of characters. | ||
| 157 | */ | ||
| 158 | private void match(int ttype, String token) | ||
| 159 | throws ParserException, IOException { | ||
| 160 | if (lookahead.ttype == ttype && lookahead.sval.compareTo(token) == 0) { | ||
| 161 | nextToken(); | ||
| 162 | } else { | ||
| 163 | throw new SyntaxException(st.lineno(), new Token(ttype, token), | ||
| 164 | lookahead); | ||
| 165 | } | ||
| 166 | } | ||
| 167 | |||
| 168 | /** | ||
| 169 | * match a token with TT_TYPE=type | ||
| 170 | */ | ||
| 171 | private void match(int ttype) throws ParserException, IOException { | ||
| 172 | if (lookahead.ttype == ttype) { | ||
| 173 | nextToken(); | ||
| 174 | } else { | ||
| 175 | throw new SyntaxException(st.lineno(), new Token(ttype), lookahead); | ||
| 176 | } | ||
| 177 | } | ||
| 178 | |||
| 179 | /** | ||
| 180 | * match a token with TT_TYPE=char, where the token value is the given char. | ||
| 181 | */ | ||
| 182 | private void match(char ttype) throws ParserException, IOException { | ||
| 183 | if (lookahead.ttype == (int)ttype) { | ||
| 184 | nextToken(); | ||
| 185 | } | ||
| 186 | else { | ||
| 187 | throw new SyntaxException(st.lineno(), new Token((int)ttype), | ||
| 188 | lookahead); | ||
| 189 | } | ||
| 190 | } | ||
| 191 | |||
| 192 | /** | ||
| 193 | * match a token with TT_TYPE='"', where the token value is a sequence | ||
| 194 | * of characters between matching quote characters. | ||
| 195 | */ | ||
| 196 | private void matchQuotedString() throws ParserException, IOException { | ||
| 197 | match(DOUBLEQUOTE); | ||
| 198 | } | ||
| 199 | |||
| 200 | /** | ||
| 201 | * match a TT_NUMBER token that matches a parsed number value | ||
| 202 | */ | ||
| 203 | private void matchNumber() throws ParserException, IOException { | ||
| 204 | match(StreamTokenizer.TT_NUMBER); | ||
| 205 | } | ||
| 206 | |||
| 207 | /** | ||
| 208 | * match a TT_WORD token that matches an arbitrary, not quoted token. | ||
| 209 | */ | ||
| 210 | private void matchID() throws ParserException, IOException { | ||
| 211 | match(StreamTokenizer.TT_WORD); | ||
| 212 | } | ||
| 213 | |||
| 214 | /** | ||
| 215 | * match a TT_WORD token that matches the given string | ||
| 216 | */ | ||
| 217 | private void match(String token) throws ParserException, IOException { | ||
| 218 | match(StreamTokenizer.TT_WORD, token); | ||
| 219 | } | ||
| 220 | |||
| 221 | /** | ||
| 222 | * determine if the given word is a reserved key word | ||
| 223 | */ | ||
| 224 | private boolean isReservedWord(String word) { | ||
| 225 | return reservedWords.contains(word); | ||
| 226 | } | ||
| 227 | |||
| 228 | /** | ||
| 229 | * determine if the give work is a reserved key word | ||
| 230 | */ | ||
| 231 | private boolean isInfixOperator(char op) { | ||
| 232 | for (int i = 0; i < infixOps.length; i++) { | ||
| 233 | if (op == infixOps[i]) { | ||
| 234 | return true; | ||
| 235 | } | ||
| 236 | } | ||
| 237 | return false; | ||
| 238 | } | ||
| 239 | |||
| 240 | /** | ||
| 241 | * scalestmt -> 'scale' scalespec | ||
| 242 | * scalespec -> <see above scaleTerminals array> | ||
| 243 | */ | ||
| 244 | private void scaleStmt(ColumnFormat cf) | ||
| 245 | throws ParserException, IOException { | ||
| 246 | match(SCALE); | ||
| 247 | Token t = matchOne(scaleKeyWords); | ||
| 248 | cf.setScale(Scale.toScale(t.sval)); | ||
| 249 | String scaleString = t.sval; | ||
| 250 | log(pdebug, "Parsed: scale -> " + scaleString); | ||
| 251 | } | ||
| 252 | |||
| 253 | /** | ||
| 254 | * alignstmt -> 'align' alignspec | ||
| 255 | * alignspec -> <see above alignTerminals array> | ||
| 256 | */ | ||
| 257 | private void alignStmt(ColumnFormat cf) | ||
| 258 | throws ParserException, IOException { | ||
| 259 | match(ALIGN); | ||
| 260 | Token t = matchOne(alignKeyWords); | ||
| 261 | cf.setAlignment(Alignment.toAlignment(t.sval)); | ||
| 262 | String alignString = t.sval; | ||
| 263 | log(pdebug, "Parsed: align -> " + alignString); | ||
| 264 | } | ||
| 265 | |||
| 266 | /** | ||
| 267 | * headerstmt -> 'header' quotedstring | ||
| 268 | */ | ||
| 269 | private void headerStmt(ColumnFormat cf) | ||
| 270 | throws ParserException, IOException { | ||
| 271 | match(HEADER); | ||
| 272 | String headerString = lookahead.sval; | ||
| 273 | matchQuotedString(); | ||
| 274 | cf.setHeader(headerString); | ||
| 275 | log(pdebug, "Parsed: header -> " + headerString); | ||
| 276 | } | ||
| 277 | |||
| 278 | /** | ||
| 279 | * widthstmt -> 'width' integer | ||
| 280 | */ | ||
| 281 | private void widthStmt(ColumnFormat cf) | ||
| 282 | throws ParserException, IOException { | ||
| 283 | match(WIDTH); | ||
| 284 | double width = lookahead.nval; | ||
| 285 | matchNumber(); | ||
| 286 | cf.setWidth((int)width); | ||
| 287 | log(pdebug, "Parsed: width -> " + width ); | ||
| 288 | } | ||
| 289 | |||
| 290 | /** | ||
| 291 | * formatstmt -> 'format' quotedstring | ||
| 292 | */ | ||
| 293 | private void formatStmt(ColumnFormat cf) | ||
| 294 | throws ParserException, IOException { | ||
| 295 | match(FORMAT); | ||
| 296 | String formatString = lookahead.sval; | ||
| 297 | matchQuotedString(); | ||
| 298 | cf.setFormat(formatString); | ||
| 299 | log(pdebug, "Parsed: format -> " + formatString); | ||
| 300 | } | ||
| 301 | |||
| 302 | /** | ||
| 303 | * Primary -> Literal | Identifier | '(' Expression ')' | ||
| 304 | */ | ||
| 305 | private Expression primary() throws ParserException, IOException { | ||
| 306 | Expression e = null; | ||
| 307 | |||
| 308 | switch (lookahead.ttype) { | ||
| 309 | case OPENPAREN: | ||
| 310 | match(OPENPAREN); | ||
| 311 | e = expression(); | ||
| 312 | match(CLOSEPAREN); | ||
| 313 | break; | ||
| 314 | case StreamTokenizer.TT_WORD: | ||
| 315 | String s = lookahead.sval; | ||
| 316 | if (isReservedWord(s)) { | ||
| 317 | throw new SyntaxException(st.lineno(), "IDENTIFIER", | ||
| 318 | "Reserved Word: " + lookahead.sval); | ||
| 319 | } | ||
| 320 | matchID(); | ||
| 321 | e = new Identifier(s); | ||
| 322 | log(pdebug, "Parsed: ID -> " + s); | ||
| 323 | break; | ||
| 324 | case StreamTokenizer.TT_NUMBER: | ||
| 325 | double literal = lookahead.nval; | ||
| 326 | matchNumber(); | ||
| 327 | e = new Literal(new Double(literal)); | ||
| 328 | log(pdebug, "Parsed: number -> " + literal); | ||
| 329 | break; | ||
| 330 | default: | ||
| 331 | throw new SyntaxException(st.lineno(), "IDENTIFIER", lookahead); | ||
| 332 | } | ||
| 333 | log(pdebug, "Parsed: primary -> " + e); | ||
| 334 | return e; | ||
| 335 | } | ||
| 336 | |||
| 337 | /** | ||
| 338 | * Unary -> ('+'|'-') Unary | Primary | ||
| 339 | */ | ||
| 340 | private Expression unary() throws ParserException, IOException { | ||
| 341 | Expression e = null; | ||
| 342 | Operator op = null; | ||
| 343 | |||
| 344 | while (true) { | ||
| 345 | switch (lookahead.ttype) { | ||
| 346 | case OPERATOR_PLUS: | ||
| 347 | match(OPERATOR_PLUS); | ||
| 348 | op = Operator.PLUS; | ||
| 349 | break; | ||
| 350 | case OPERATOR_MINUS: | ||
| 351 | match(OPERATOR_MINUS); | ||
| 352 | op = Operator.MINUS; | ||
| 353 | break; | ||
| 354 | default: | ||
| 355 | e = primary(); | ||
| 356 | log(pdebug, "Parsed: unary -> " + e); | ||
| 357 | return e; | ||
| 358 | } | ||
| 359 | Expression e1 = new Expression(); | ||
| 360 | e1.setOperator(op); | ||
| 361 | e1.setRight(e); | ||
| 362 | log(pdebug, "Parsed: unary -> " + e1); | ||
| 363 | e1.setLeft(new Literal(new Double(0))); | ||
| 364 | e = e1; | ||
| 365 | } | ||
| 366 | } | ||
| 367 | |||
| 368 | /** | ||
| 369 | * MultExpression -> Unary (('*' | '/') Unary)* | ||
| 370 | */ | ||
| 371 | private Expression multExpression() throws ParserException, IOException { | ||
| 372 | Expression e = unary(); | ||
| 373 | Operator op = null; | ||
| 374 | |||
| 375 | while (true) { | ||
| 376 | switch (lookahead.ttype) { | ||
| 377 | case OPERATOR_MULTIPLY: | ||
| 378 | match(OPERATOR_MULTIPLY); | ||
| 379 | op = Operator.MULTIPLY; | ||
| 380 | break; | ||
| 381 | case OPERATOR_DIVIDE: | ||
| 382 | match(OPERATOR_DIVIDE); | ||
| 383 | op = Operator.DIVIDE; | ||
| 384 | break; | ||
| 385 | default: | ||
| 386 | log(pdebug, "Parsed: multExpression -> " + e); | ||
| 387 | return e; | ||
| 388 | } | ||
| 389 | Expression e1 = new Expression(); | ||
| 390 | e1.setOperator(op); | ||
| 391 | e1.setLeft(e); | ||
| 392 | e1.setRight(unary()); | ||
| 393 | e = e1; | ||
| 394 | log(pdebug, "Parsed: multExpression -> " + e); | ||
| 395 | } | ||
| 396 | } | ||
| 397 | |||
| 398 | /** | ||
| 399 | * AddExpression -> MultExpression (('+' | '-') MultExpression)* | ||
| 400 | */ | ||
| 401 | private Expression addExpression() throws ParserException, IOException { | ||
| 402 | Expression e = multExpression(); | ||
| 403 | Operator op = null; | ||
| 404 | |||
| 405 | while (true) { | ||
| 406 | switch (lookahead.ttype) { | ||
| 407 | case OPERATOR_PLUS: | ||
| 408 | match(OPERATOR_PLUS); | ||
| 409 | op = Operator.PLUS; | ||
| 410 | break; | ||
| 411 | case OPERATOR_MINUS: | ||
| 412 | match(OPERATOR_MINUS); | ||
| 413 | op = Operator.MINUS; | ||
| 414 | break; | ||
| 415 | default: | ||
| 416 | log(pdebug, "Parsed: addExpression -> " + e); | ||
| 417 | return e; | ||
| 418 | } | ||
| 419 | Expression e1 = new Expression(); | ||
| 420 | e1.setOperator(op); | ||
| 421 | e1.setLeft(e); | ||
| 422 | e1.setRight(multExpression()); | ||
| 423 | e = e1; | ||
| 424 | log(pdebug, "Parsed: addExpression -> " + e); | ||
| 425 | } | ||
| 426 | } | ||
| 427 | |||
| 428 | /** | ||
| 429 | * Expression -> AddExpression | ||
| 430 | */ | ||
| 431 | private Expression expression() throws ParserException, IOException { | ||
| 432 | Expression e = addExpression(); | ||
| 433 | log(pdebug, "Parsed: expression -> " + e); | ||
| 434 | return e; | ||
| 435 | } | ||
| 436 | |||
| 437 | /** | ||
| 438 | * datastmt -> 'data' expression | ||
| 439 | */ | ||
| 440 | private void dataStmt(ColumnFormat cf) throws ParserException, IOException { | ||
| 441 | match(DATA); | ||
| 442 | Expression e = expression(); | ||
| 443 | cf.setExpression(e); | ||
| 444 | log(pdebug, "Parsed: data -> " + e); | ||
| 445 | } | ||
| 446 | |||
| 447 | /** | ||
| 448 | * statementlist -> optionalstmt statementlist | ||
| 449 | * optionalstmt -> 'data' expression | ||
| 450 | * 'header' quotedstring | ||
| 451 | * 'width' integer | ||
| 452 | * 'format' formatstring | ||
| 453 | * 'align' alignspec | ||
| 454 | * 'scale' scalespec | ||
| 455 | */ | ||
| 456 | private void statementList(ColumnFormat cf) | ||
| 457 | throws ParserException, IOException { | ||
| 458 | while (true) { | ||
| 459 | if (lookahead.ttype != StreamTokenizer.TT_WORD) { | ||
| 460 | return; | ||
| 461 | } | ||
| 462 | |||
| 463 | if (lookahead.sval.compareTo(DATA) == 0) { | ||
| 464 | dataStmt(cf); | ||
| 465 | } else if (lookahead.sval.compareTo(HEADER) == 0) { | ||
| 466 | headerStmt(cf); | ||
| 467 | } else if (lookahead.sval.compareTo(WIDTH) == 0) { | ||
| 468 | widthStmt(cf); | ||
| 469 | } else if (lookahead.sval.compareTo(FORMAT) == 0) { | ||
| 470 | formatStmt(cf); | ||
| 471 | } else if (lookahead.sval.compareTo(ALIGN) == 0) { | ||
| 472 | alignStmt(cf); | ||
| 473 | } else if (lookahead.sval.compareTo(SCALE) == 0) { | ||
| 474 | scaleStmt(cf); | ||
| 475 | } else { | ||
| 476 | return; | ||
| 477 | } | ||
| 478 | } | ||
| 479 | } | ||
| 480 | |||
| 481 | /** | ||
| 482 | * optionlist -> columspec optionlist | ||
| 483 | * null | ||
| 484 | * columspec -> 'column' '{' statementlist '}' | ||
| 485 | */ | ||
| 486 | private void optionList(OptionFormat of) | ||
| 487 | throws ParserException, IOException { | ||
| 488 | while (true) { | ||
| 489 | if (lookahead.ttype != StreamTokenizer.TT_WORD) { | ||
| 490 | return; | ||
| 491 | } | ||
| 492 | |||
| 493 | match(COLUMN); | ||
| 494 | match(OPENBLOCK); | ||
| 495 | ColumnFormat cf = new ColumnFormat(columnCount++); | ||
| 496 | statementList(cf); | ||
| 497 | match(CLOSEBLOCK); | ||
| 498 | cf.validate(); | ||
| 499 | of.addSubFormat(cf); | ||
| 500 | } | ||
| 501 | } | ||
| 502 | |||
| 503 | /** | ||
| 504 | * optionstmt -> 'option' ID '{' optionlist '}' | ||
| 505 | */ | ||
| 506 | private OptionFormat optionStmt() throws ParserException, IOException { | ||
| 507 | match(OPTION); | ||
| 508 | String optionName=lookahead.sval; | ||
| 509 | matchID(); | ||
| 510 | match(OPENBLOCK); | ||
| 511 | OptionFormat of = new OptionFormat(optionName); | ||
| 512 | optionList(of); | ||
| 513 | match(CLOSEBLOCK); | ||
| 514 | return of; | ||
| 515 | } | ||
| 516 | |||
| 517 | /** | ||
| 518 | * parse the specification for the given option identifier | ||
| 519 | */ | ||
| 520 | public OptionFormat parse(String option) | ||
| 521 | throws ParserException, IOException { | ||
| 522 | nextToken(); | ||
| 523 | |||
| 524 | /* | ||
| 525 | * this search stops on the first occurance of an option | ||
| 526 | * statement with a name matching the given option. Any | ||
| 527 | * duplicate options are ignored. | ||
| 528 | */ | ||
| 529 | while (lookahead.ttype != StreamTokenizer.TT_EOF) { | ||
| 530 | // look for the start symbol | ||
| 531 | if ((lookahead.ttype != StreamTokenizer.TT_WORD) | ||
| 532 | || (lookahead.sval.compareTo(START) != 0)) { | ||
| 533 | // skip tokens until a start symbol is found | ||
| 534 | nextToken(); | ||
| 535 | continue; | ||
| 536 | } | ||
| 537 | |||
| 538 | // check if the option name is the one we are interested in | ||
| 539 | match(START); | ||
| 540 | |||
| 541 | if ((lookahead.ttype == StreamTokenizer.TT_WORD) | ||
| 542 | && (lookahead.sval.compareTo(option) == 0)) { | ||
| 543 | // this is the one we are looking for, parse it | ||
| 544 | pushBack(); | ||
| 545 | return optionStmt(); | ||
| 546 | } else { | ||
| 547 | // not what we are looking for, start skipping tokens | ||
| 548 | nextToken(); | ||
| 549 | } | ||
| 550 | } | ||
| 551 | return null; | ||
| 552 | } | ||
| 553 | |||
| 554 | public Set<OptionFormat> parseOptions() throws ParserException, IOException { | ||
| 555 | Set<OptionFormat> options = new HashSet<OptionFormat>(); | ||
| 556 | |||
| 557 | nextToken(); | ||
| 558 | |||
| 559 | while (lookahead.ttype != StreamTokenizer.TT_EOF) { | ||
| 560 | // look for the start symbol | ||
| 561 | if ((lookahead.ttype != StreamTokenizer.TT_WORD) | ||
| 562 | || (lookahead.sval.compareTo(START) != 0)) { | ||
| 563 | // skip tokens until a start symbol is found | ||
| 564 | nextToken(); | ||
| 565 | continue; | ||
| 566 | } | ||
| 567 | |||
| 568 | // note: if a duplicate option statement exists, then | ||
| 569 | // first one encountered is the chosen definition. | ||
| 570 | OptionFormat of = optionStmt(); | ||
| 571 | options.add(of); | ||
| 572 | } | ||
| 573 | return options; | ||
| 574 | } | ||
| 575 | |||
| 576 | OptionFormat getOptionFormat() { | ||
| 577 | return optionFormat; | ||
| 578 | } | ||
| 579 | |||
| 580 | private void log(boolean logging, String s) { | ||
| 581 | if (logging) { | ||
| 582 | System.out.println(s); | ||
| 583 | } | ||
| 584 | } | ||
| 585 | } | ||