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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 2005, 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.reflect.generics.parser; | |
| 27 | + | |
| 28 | + | |
| 29 | +import java.lang.reflect.GenericSignatureFormatError; | |
| 30 | +import java.util.*; | |
| 31 | +import sun.reflect.generics.tree.*; | |
| 32 | + | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * Parser for type signatures, as defined in the Java Virtual | |
| 36 | +// Machine Specification (JVMS) chapter 4. | |
| 37 | + * Converts the signatures into an abstract syntax tree (AST) representation. | |
| 38 | +// See the package sun.reflect.generics.tree for details of the AST. | |
| 39 | + */ | |
| 40 | +public class SignatureParser { | |
| 41 | + // The input is conceptually a character stream (though currently it's | |
| 42 | + // a string). This is slightly different than traditional parsers, | |
| 43 | + // because there is no lexical scanner performing tokenization. | |
| 44 | + // Having a separate tokenizer does not fit with the nature of the | |
| 45 | + // input format. | |
| 46 | + // Other than the absence of a tokenizer, this parser is a classic | |
| 47 | + // recursive descent parser. Its structure corresponds as closely | |
| 48 | + // as possible to the grammar in the JVMS. | |
| 49 | + // | |
| 50 | + // A note on asserts vs. errors: The code contains assertions | |
| 51 | + // in situations that should never occur. An assertion failure | |
| 52 | + // indicates a failure of the parser logic. A common pattern | |
| 53 | + // is an assertion that the current input is a particular | |
| 54 | + // character. This is often paired with a separate check | |
| 55 | + // that this is the case, which seems redundant. For example: | |
| 56 | + // | |
| 57 | + // assert(current() != x); | |
| 58 | + // if (current != x {error("expected an x"); | |
| 59 | + // | |
| 60 | + // where x is some character constant. | |
| 61 | + // The assertion inidcates, that, as currently written, | |
| 62 | + // the code should nver reach this point unless the input is an | |
| 63 | + // x. On the other hand, the test is there to check the legality | |
| 64 | + // of the input wrt to a given production. It may be that at a later | |
| 65 | + // time the code might be called directly, and if the input is | |
| 66 | + // invalid, the parser should flag an error in accordance | |
| 67 | + // with its logic. | |
| 68 | + | |
| 69 | + private char[] input; // the input signature | |
| 70 | + private int index = 0; // index into the input | |
| 71 | +// used to mark end of input | |
| 72 | + private static final char EOI = ':'; | |
| 73 | + private static final boolean DEBUG = false; | |
| 74 | + | |
| 75 | + // private constructor - enforces use of static factory | |
| 76 | + private SignatureParser(){} | |
| 77 | + | |
| 78 | + // Utility methods. | |
| 79 | + | |
| 80 | + // Most parsing routines use the following routines to access the | |
| 81 | + // input stream, and advance it as necessary. | |
| 82 | + // This makes it easy to adapt the parser to operate on streams | |
| 83 | + // of various kinds as well as strings. | |
| 84 | + | |
| 85 | + // returns current element of the input and advances the input | |
| 86 | + private char getNext(){ | |
| 87 | + assert(index <= input.length); | |
| 88 | + try { | |
| 89 | + return input[index++]; | |
| 90 | + } catch (ArrayIndexOutOfBoundsException e) { return EOI;} | |
| 91 | + } | |
| 92 | + | |
| 93 | + // returns current element of the input | |
| 94 | + private char current(){ | |
| 95 | + assert(index <= input.length); | |
| 96 | + try { | |
| 97 | + return input[index]; | |
| 98 | + } catch (ArrayIndexOutOfBoundsException e) { return EOI;} | |
| 99 | + } | |
| 100 | + | |
| 101 | + // advance the input | |
| 102 | + private void advance(){ | |
| 103 | + assert(index <= input.length); | |
| 104 | + index++; | |
| 105 | + } | |
| 106 | + | |
| 107 | + // Match c against a "set" of characters | |
| 108 | + private boolean matches(char c, char... set) { | |
| 109 | + for (char e : set) { | |
| 110 | + if (c == e) return true; | |
| 111 | + } | |
| 112 | + return false; | |
| 113 | + } | |
| 114 | + | |
| 115 | + // Error handling routine. Encapsulates error handling. | |
| 116 | + // Takes a string error message as argument. | |
| 117 | + // Currently throws a GenericSignatureFormatError. | |
| 118 | + | |
| 119 | + private Error error(String errorMsg) { | |
| 120 | + if (DEBUG) System.out.println("Parse error:" + errorMsg); | |
| 121 | + return new GenericSignatureFormatError(); | |
| 122 | + } | |
| 123 | + | |
| 124 | + /** | |
| 125 | + * Static factory method. Produces a parser instance. | |
| 126 | + * @return an instance of <tt>SignatureParser</tt> | |
| 127 | + */ | |
| 128 | + public static SignatureParser make() { | |
| 129 | + return new SignatureParser(); | |
| 130 | + } | |
| 131 | + | |
| 132 | + /** | |
| 133 | + * Parses a class signature (as defined in the JVMS, chapter 4) | |
| 134 | + * and produces an abstract syntax tree representing it. | |
| 135 | + * @param s a string representing the input class signature | |
| 136 | + * @return An abstract syntax tree for a class signature | |
| 137 | + * corresponding to the input string | |
| 138 | + * @throws GenericSignatureFormatError if the input is not a valid | |
| 139 | + * class signature | |
| 140 | + */ | |
| 141 | + public ClassSignature parseClassSig(String s) { | |
| 142 | + if (DEBUG) System.out.println("Parsing class sig:" + s); | |
| 143 | + input = s.toCharArray(); | |
| 144 | + return parseClassSignature(); | |
| 145 | + } | |
| 146 | + | |
| 147 | + /** | |
| 148 | + * Parses a method signature (as defined in the JVMS, chapter 4) | |
| 149 | + * and produces an abstract syntax tree representing it. | |
| 150 | + * @param s a string representing the input method signature | |
| 151 | + * @return An abstract syntax tree for a method signature | |
| 152 | + * corresponding to the input string | |
| 153 | + * @throws GenericSignatureFormatError if the input is not a valid | |
| 154 | + * method signature | |
| 155 | + */ | |
| 156 | + public MethodTypeSignature parseMethodSig(String s) { | |
| 157 | + if (DEBUG) System.out.println("Parsing method sig:" + s); | |
| 158 | + input = s.toCharArray(); | |
| 159 | + return parseMethodTypeSignature(); | |
| 160 | + } | |
| 161 | + | |
| 162 | + | |
| 163 | + /** | |
| 164 | + * Parses a type signature | |
| 165 | + * and produces an abstract syntax tree representing it. | |
| 166 | + * @param s a string representing the input type signature | |
| 167 | + * @return An abstract syntax tree for a type signature | |
| 168 | + * corresponding to the input string | |
| 169 | + * @throws GenericSignatureFormatError if the input is not a valid | |
| 170 | + * type signature | |
| 171 | + */ | |
| 172 | + public TypeSignature parseTypeSig(String s) { | |
| 173 | + if (DEBUG) System.out.println("Parsing type sig:" + s); | |
| 174 | + input = s.toCharArray(); | |
| 175 | + return parseTypeSignature(); | |
| 176 | + } | |
| 177 | + | |
| 178 | + // Parsing routines. | |
| 179 | + // As a rule, the parsing routines access the input using the | |
| 180 | + // utilities current(), getNext() and/or advance(). | |
| 181 | + // The convention is that when a parsing routine is invoked | |
| 182 | + // it expects the current input to be the first character it should parse | |
| 183 | + // and when it completes parsing, it leaves the input at the first | |
| 184 | + // character after the input parses. | |
| 185 | + | |
| 186 | + // parse a class signature based on the implicit input. | |
| 187 | + private ClassSignature parseClassSignature() { | |
| 188 | + assert(index == 0); | |
| 189 | + return ClassSignature.make(parseZeroOrMoreFormalTypeParameters(), | |
| 190 | + parseClassTypeSignature(), | |
| 191 | + parseSuperInterfaces()); | |
| 192 | + } | |
| 193 | + | |
| 194 | + private FormalTypeParameter[] parseZeroOrMoreFormalTypeParameters(){ | |
| 195 | + if (current() == '<') { return parseFormalTypeParameters();} | |
| 196 | + else {return new FormalTypeParameter[0];} | |
| 197 | + } | |
| 198 | + | |
| 199 | + | |
| 200 | + private FormalTypeParameter[] parseFormalTypeParameters(){ | |
| 201 | + Collection<FormalTypeParameter> ftps = | |
| 202 | + new ArrayList<FormalTypeParameter>(3); | |
| 203 | + assert(current() == '<'); // should not have been called at all | |
| 204 | + if (current() != '<') { throw error("expected <");} | |
| 205 | + advance(); | |
| 206 | + ftps.add(parseFormalTypeParameter()); | |
| 207 | + while (current() != '>') { | |
| 208 | + ftps.add(parseFormalTypeParameter()); | |
| 209 | + } | |
| 210 | + advance(); | |
| 211 | + FormalTypeParameter[] ftpa = new FormalTypeParameter[ftps.size()]; | |
| 212 | + return ftps.toArray(ftpa); | |
| 213 | + } | |
| 214 | + | |
| 215 | + private FormalTypeParameter parseFormalTypeParameter(){ | |
| 216 | + String id = parseIdentifier(); | |
| 217 | + FieldTypeSignature[] bs = parseZeroOrMoreBounds(); | |
| 218 | + return FormalTypeParameter.make(id, bs); | |
| 219 | + } | |
| 220 | + | |
| 221 | + private String parseIdentifier(){ | |
| 222 | + StringBuilder result = new StringBuilder(); | |
| 223 | + while (!Character.isWhitespace(current())) { | |
| 224 | + char c = current(); | |
| 225 | + switch(c) { | |
| 226 | + case ';': | |
| 227 | + case '.': | |
| 228 | + case '/': | |
| 229 | + case '[': | |
| 230 | + case ':': | |
| 231 | + case '>': | |
| 232 | + case '<': return result.toString(); | |
| 233 | + default:{ | |
| 234 | + result.append(c); | |
| 235 | + advance(); | |
| 236 | + } | |
| 237 | + | |
| 238 | + } | |
| 239 | + } | |
| 240 | + return result.toString(); | |
| 241 | + } | |
| 242 | + | |
| 243 | + private FieldTypeSignature parseFieldTypeSignature() { | |
| 244 | + switch(current()) { | |
| 245 | + case 'L': | |
| 246 | + return parseClassTypeSignature(); | |
| 247 | + case 'T': | |
| 248 | + return parseTypeVariableSignature(); | |
| 249 | + case '[': | |
| 250 | + return parseArrayTypeSignature(); | |
| 251 | + default: throw error("Expected Field Type Signature"); | |
| 252 | + } | |
| 253 | + } | |
| 254 | + | |
| 255 | + private ClassTypeSignature parseClassTypeSignature(){ | |
| 256 | + assert(current() == 'L'); | |
| 257 | + if (current() != 'L') { throw error("expected a class type");} | |
| 258 | + advance(); | |
| 259 | + List<SimpleClassTypeSignature> scts = | |
| 260 | + new ArrayList<SimpleClassTypeSignature>(5); | |
| 261 | + scts.add(parseSimpleClassTypeSignature(false)); | |
| 262 | + parseClassTypeSignatureSuffix(scts); | |
| 263 | + if (current() != ';') | |
| 264 | + throw error("expected ';' got '" + current() + "'"); | |
| 265 | + | |
| 266 | + advance(); | |
| 267 | + return ClassTypeSignature.make(scts); | |
| 268 | + } | |
| 269 | + | |
| 270 | + private SimpleClassTypeSignature parseSimpleClassTypeSignature(boolean dollar){ | |
| 271 | + String id = parseIdentifier(); | |
| 272 | + char c = current(); | |
| 273 | + switch (c) { | |
| 274 | + case ';': | |
| 275 | + case '/': | |
| 276 | + return SimpleClassTypeSignature.make(id, dollar, new TypeArgument[0]) ; | |
| 277 | + case '<': { | |
| 278 | + return SimpleClassTypeSignature.make(id, dollar, parseTypeArguments()); | |
| 279 | + } | |
| 280 | + default: {throw error("expected < or ; or /");} | |
| 281 | + } | |
| 282 | + } | |
| 283 | + | |
| 284 | + private void parseClassTypeSignatureSuffix(List<SimpleClassTypeSignature> scts) { | |
| 285 | + while (current() == '/' || current() == '.') { | |
| 286 | + boolean dollar = (current() == '.'); | |
| 287 | + advance(); | |
| 288 | + scts.add(parseSimpleClassTypeSignature(dollar)); | |
| 289 | + } | |
| 290 | + } | |
| 291 | + | |
| 292 | + private TypeArgument[] parseTypeArgumentsOpt() { | |
| 293 | + if (current() == '<') {return parseTypeArguments();} | |
| 294 | + else {return new TypeArgument[0];} | |
| 295 | + } | |
| 296 | + | |
| 297 | + private TypeArgument[] parseTypeArguments() { | |
| 298 | + Collection<TypeArgument> tas = new ArrayList<TypeArgument>(3); | |
| 299 | + assert(current() == '<'); | |
| 300 | + if (current() != '<') { throw error("expected <");} | |
| 301 | + advance(); | |
| 302 | + tas.add(parseTypeArgument()); | |
| 303 | + while (current() != '>') { | |
| 304 | + //(matches(current(), '+', '-', 'L', '[', 'T', '*')) { | |
| 305 | + tas.add(parseTypeArgument()); | |
| 306 | + } | |
| 307 | + advance(); | |
| 308 | + TypeArgument[] taa = new TypeArgument[tas.size()]; | |
| 309 | + return tas.toArray(taa); | |
| 310 | + } | |
| 311 | + | |
| 312 | + private TypeArgument parseTypeArgument() { | |
| 313 | + FieldTypeSignature[] ub, lb; | |
| 314 | + ub = new FieldTypeSignature[1]; | |
| 315 | + lb = new FieldTypeSignature[1]; | |
| 316 | + TypeArgument[] ta = new TypeArgument[0]; | |
| 317 | + char c = current(); | |
| 318 | + switch (c) { | |
| 319 | + case '+': { | |
| 320 | + advance(); | |
| 321 | + ub[0] = parseFieldTypeSignature(); | |
| 322 | + lb[0] = BottomSignature.make(); // bottom | |
| 323 | + return Wildcard.make(ub, lb); | |
| 324 | + } | |
| 325 | + case '*':{ | |
| 326 | + advance(); | |
| 327 | + ub[0] = SimpleClassTypeSignature.make("java.lang.Object", false, ta); | |
| 328 | + lb[0] = BottomSignature.make(); // bottom | |
| 329 | + return Wildcard.make(ub, lb); | |
| 330 | + } | |
| 331 | + case '-': { | |
| 332 | + advance(); | |
| 333 | + lb[0] = parseFieldTypeSignature(); | |
| 334 | + ub[0] = SimpleClassTypeSignature.make("java.lang.Object", false, ta); | |
| 335 | + return Wildcard.make(ub, lb); | |
| 336 | + } | |
| 337 | + default: return parseFieldTypeSignature(); | |
| 338 | + } | |
| 339 | + } | |
| 340 | + | |
| 341 | + // TypeVariableSignature -> T identifier | |
| 342 | + | |
| 343 | + private TypeVariableSignature parseTypeVariableSignature(){ | |
| 344 | + assert(current() == 'T'); | |
| 345 | + if (current() != 'T') { throw error("expected a type variable usage");} | |
| 346 | + advance(); | |
| 347 | + TypeVariableSignature ts = | |
| 348 | + TypeVariableSignature.make(parseIdentifier()); | |
| 349 | + if (current() != ';') { | |
| 350 | + throw error("; expected in signature of type variable named" + | |
| 351 | + ts.getIdentifier()); | |
| 352 | + } | |
| 353 | + advance(); | |
| 354 | + return ts; | |
| 355 | + } | |
| 356 | + | |
| 357 | + // ArrayTypeSignature -> [ TypeSignature | |
| 358 | + | |
| 359 | + private ArrayTypeSignature parseArrayTypeSignature() { | |
| 360 | + if (current() != '[') {throw error("expected array type signature");} | |
| 361 | + advance(); | |
| 362 | + return ArrayTypeSignature.make(parseTypeSignature()); | |
| 363 | + } | |
| 364 | + | |
| 365 | + // TypeSignature -> BaseType | FieldTypeSignature | |
| 366 | + | |
| 367 | + private TypeSignature parseTypeSignature() { | |
| 368 | + switch (current()) { | |
| 369 | + case 'B': | |
| 370 | + case 'C': | |
| 371 | + case 'D': | |
| 372 | + case 'F': | |
| 373 | + case 'I': | |
| 374 | + case 'J': | |
| 375 | + case 'S': | |
| 376 | + case 'Z':return parseBaseType(); | |
| 377 | + default: return parseFieldTypeSignature(); | |
| 378 | + } | |
| 379 | + } | |
| 380 | + | |
| 381 | + private BaseType parseBaseType() { | |
| 382 | + switch(current()) { | |
| 383 | + case 'B': | |
| 384 | + advance(); | |
| 385 | + return ByteSignature.make(); | |
| 386 | + case 'C': | |
| 387 | + advance(); | |
| 388 | + return CharSignature.make(); | |
| 389 | + case 'D': | |
| 390 | + advance(); | |
| 391 | + return DoubleSignature.make(); | |
| 392 | + case 'F': | |
| 393 | + advance(); | |
| 394 | + return FloatSignature.make(); | |
| 395 | + case 'I': | |
| 396 | + advance(); | |
| 397 | + return IntSignature.make(); | |
| 398 | + case 'J': | |
| 399 | + advance(); | |
| 400 | + return LongSignature.make(); | |
| 401 | + case 'S': | |
| 402 | + advance(); | |
| 403 | + return ShortSignature.make(); | |
| 404 | + case 'Z': | |
| 405 | + advance(); | |
| 406 | + return BooleanSignature.make(); | |
| 407 | + default: { | |
| 408 | + assert(false); | |
| 409 | + throw error("expected primitive type"); | |
| 410 | + } | |
| 411 | + } | |
| 412 | + } | |
| 413 | + | |
| 414 | + private FieldTypeSignature[] parseZeroOrMoreBounds() { | |
| 415 | + Collection<FieldTypeSignature> fts = | |
| 416 | + new ArrayList<FieldTypeSignature>(3); | |
| 417 | + | |
| 418 | + if (current() == ':') { | |
| 419 | + advance(); | |
| 420 | + switch(current()) { | |
| 421 | + case ':': // empty class bound | |
| 422 | + break; | |
| 423 | + | |
| 424 | + default: // parse class bound | |
| 425 | + fts.add(parseFieldTypeSignature()); | |
| 426 | + } | |
| 427 | + | |
| 428 | + // zero or more interface bounds | |
| 429 | + while (current() == ':') { | |
| 430 | + advance(); | |
| 431 | + fts.add(parseFieldTypeSignature()); | |
| 432 | + } | |
| 433 | + } | |
| 434 | + | |
| 435 | + FieldTypeSignature[] fta = new FieldTypeSignature[fts.size()]; | |
| 436 | + return fts.toArray(fta); | |
| 437 | + } | |
| 438 | + | |
| 439 | + private ClassTypeSignature[] parseSuperInterfaces() { | |
| 440 | + Collection<ClassTypeSignature> cts = | |
| 441 | + new ArrayList<ClassTypeSignature>(5); | |
| 442 | + while(current() == 'L') { | |
| 443 | + cts.add(parseClassTypeSignature()); | |
| 444 | + } | |
| 445 | + ClassTypeSignature[] cta = new ClassTypeSignature[cts.size()]; | |
| 446 | + return cts.toArray(cta); | |
| 447 | + } | |
| 448 | + | |
| 449 | + // parse a method signature based on the implicit input. | |
| 450 | + private MethodTypeSignature parseMethodTypeSignature() { | |
| 451 | + FieldTypeSignature[] ets; | |
| 452 | + | |
| 453 | + assert(index == 0); | |
| 454 | + return MethodTypeSignature.make(parseZeroOrMoreFormalTypeParameters(), | |
| 455 | + parseFormalParameters(), | |
| 456 | + parseReturnType(), | |
| 457 | + parseZeroOrMoreThrowsSignatures()); | |
| 458 | + } | |
| 459 | + | |
| 460 | + // (TypeSignature*) | |
| 461 | + private TypeSignature[] parseFormalParameters() { | |
| 462 | + if (current() != '(') {throw error("expected (");} | |
| 463 | + advance(); | |
| 464 | + TypeSignature[] pts = parseZeroOrMoreTypeSignatures(); | |
| 465 | + if (current() != ')') {throw error("expected )");} | |
| 466 | + advance(); | |
| 467 | + return pts; | |
| 468 | + } | |
| 469 | + | |
| 470 | + // TypeSignature* | |
| 471 | + private TypeSignature[] parseZeroOrMoreTypeSignatures() { | |
| 472 | + Collection<TypeSignature> ts = new ArrayList<TypeSignature>(); | |
| 473 | + boolean stop = false; | |
| 474 | + while (!stop) { | |
| 475 | + switch(current()) { | |
| 476 | + case 'B': | |
| 477 | + case 'C': | |
| 478 | + case 'D': | |
| 479 | + case 'F': | |
| 480 | + case 'I': | |
| 481 | + case 'J': | |
| 482 | + case 'S': | |
| 483 | + case 'Z': | |
| 484 | + case 'L': | |
| 485 | + case 'T': | |
| 486 | + case '[': { | |
| 487 | + ts.add(parseTypeSignature()); | |
| 488 | + break; | |
| 489 | + } | |
| 490 | + default: stop = true; | |
| 491 | + } | |
| 492 | + } | |
| 493 | + /* while( matches(current(), | |
| 494 | + 'B', 'C', 'D', 'F', 'I', 'J', 'S', 'Z', 'L', 'T', '[') | |
| 495 | + ) { | |
| 496 | + ts.add(parseTypeSignature()); | |
| 497 | + }*/ | |
| 498 | + TypeSignature[] ta = new TypeSignature[ts.size()]; | |
| 499 | + return ts.toArray(ta); | |
| 500 | + } | |
| 501 | + | |
| 502 | + // ReturnType -> V | TypeSignature | |
| 503 | + | |
| 504 | + private ReturnType parseReturnType(){ | |
| 505 | + if (current() == 'V') { | |
| 506 | + advance(); | |
| 507 | + return VoidDescriptor.make(); | |
| 508 | + } else return parseTypeSignature(); | |
| 509 | + } | |
| 510 | + | |
| 511 | + // ThrowSignature* | |
| 512 | + private FieldTypeSignature[] parseZeroOrMoreThrowsSignatures(){ | |
| 513 | + Collection<FieldTypeSignature> ets = | |
| 514 | + new ArrayList<FieldTypeSignature>(3); | |
| 515 | + while( current() == '^') { | |
| 516 | + ets.add(parseThrowsSignature()); | |
| 517 | + } | |
| 518 | + FieldTypeSignature[] eta = new FieldTypeSignature[ets.size()]; | |
| 519 | + return ets.toArray(eta); | |
| 520 | + } | |
| 521 | + | |
| 522 | + // ThrowSignature -> ^ FieldTypeSignature | |
| 523 | + | |
| 524 | + private FieldTypeSignature parseThrowsSignature() { | |
| 525 | + assert(current() == '^'); | |
| 526 | + if (current() != '^') { throw error("expected throws signature");} | |
| 527 | + advance(); | |
| 528 | + return parseFieldTypeSignature(); | |
| 529 | + } | |
| 530 | + } | |