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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 interface Visitor<R> { | |
| 6 R visitBlock(Block node); | |
| 7 R visitBreakStatement(BreakStatement node); | |
| 8 R visitCatchBlock(CatchBlock node); | |
| 9 R visitClassNode(ClassNode node); | |
| 10 R visitConditional(Conditional node); | |
| 11 R visitContinueStatement(ContinueStatement node); | |
| 12 R visitDoWhile(DoWhile node); | |
| 13 R visitEmptyStatement(EmptyStatement node); | |
| 14 R visitExpressionStatement(ExpressionStatement node); | |
| 15 R visitFor(For node); | |
| 16 R visitForInStatement(ForInStatement node); | |
| 17 R visitFunctionDeclaration(FunctionDeclaration node); | |
| 18 R visitFunctionExpression(FunctionExpression node); | |
| 19 R visitIdentifier(Identifier node); | |
| 20 R visitIf(If node); | |
| 21 R visitLabeledStatement(LabeledStatement node); | |
| 22 R visitLiteralBool(LiteralBool node); | |
| 23 R visitLiteralDouble(LiteralDouble node); | |
| 24 R visitLiteralInt(LiteralInt node); | |
| 25 R visitLiteralList(LiteralList node); | |
| 26 R visitLiteralMap(LiteralMap node); | |
| 27 R visitLiteralMapEntry(LiteralMapEntry node); | |
| 28 R visitLiteralNull(LiteralNull node); | |
| 29 R visitLiteralString(LiteralString node); | |
| 30 R visitStringJuxtaposition(StringJuxtaposition node); | |
| 31 R visitModifiers(Modifiers node); | |
| 32 R visitNamedArgument(NamedArgument node); | |
| 33 R visitNewExpression(NewExpression node); | |
| 34 R visitNodeList(NodeList node); | |
| 35 R visitOperator(Operator node); | |
| 36 R visitParenthesizedExpression(ParenthesizedExpression node); | |
| 37 R visitReturn(Return node); | |
| 38 R visitScriptTag(ScriptTag node); | |
| 39 R visitSend(Send node); | |
| 40 R visitSendSet(SendSet node); | |
| 41 R visitStringInterpolation(StringInterpolation node); | |
| 42 R visitStringInterpolationPart(StringInterpolationPart node); | |
| 43 R visitSwitchCase(SwitchCase node); | |
| 44 R visitSwitchStatement(SwitchStatement node); | |
| 45 R visitThrow(Throw node); | |
| 46 R visitTryStatement(TryStatement node); | |
| 47 R visitTypeAnnotation(TypeAnnotation node); | |
| 48 R visitTypedef(Typedef node); | |
| 49 R visitTypeVariable(TypeVariable node); | |
| 50 R visitVariableDefinitions(VariableDefinitions node); | |
| 51 R visitWhile(While node); | |
| 52 } | |
| 53 | |
| 54 Token firstBeginToken(Node first, Node second) { | |
| 55 if (first !== null) return first.getBeginToken(); | |
| 56 if (second !== null) return second.getBeginToken(); | |
| 57 return null; | |
| 58 } | |
| 59 | |
| 60 class NodeAssertionFailure implements Exception { | |
| 61 final Node node; | |
| 62 final String message; | |
| 63 NodeAssertionFailure(this.node, this.message); | |
| 64 } | |
| 65 | |
| 66 /** | |
| 67 * A node in a syntax tree. | |
| 68 * | |
| 69 * The abstract part of "abstract syntax tree" is invalidated when | |
| 70 * supporting tools such as code formatting. These tools need concrete | |
| 71 * syntax such as parentheses and no constant folding. | |
| 72 * | |
| 73 * We support these tools by storing additional references back to the | |
| 74 * token stream. These references are stored in fields ending with | |
| 75 * "Token". | |
| 76 */ | |
| 77 class Node implements Hashable { | |
| 78 final int _hashCode; | |
| 79 static int _HASH_COUNTER = 0; | |
| 80 | |
| 81 Node() : _hashCode = ++_HASH_COUNTER; | |
| 82 | |
| 83 hashCode() => _hashCode; | |
| 84 | |
| 85 abstract accept(Visitor visitor); | |
| 86 | |
| 87 abstract visitChildren(Visitor visitor); | |
| 88 | |
| 89 toString() => unparse(false); | |
| 90 | |
| 91 toDebugString() => unparse(true); | |
| 92 | |
| 93 String getObjectDescription() => super.toString(); | |
| 94 | |
| 95 String unparse(bool printDebugInfo) { | |
| 96 Unparser unparser = new Unparser(printDebugInfo); | |
| 97 try { | |
| 98 return unparser.unparse(this); | |
| 99 } catch (var e, var trace) { | |
| 100 print(trace); | |
| 101 return '<<unparse error: ${getObjectDescription()}: ${unparser.sb}>>'; | |
| 102 } | |
| 103 } | |
| 104 | |
| 105 abstract Token getBeginToken(); | |
| 106 | |
| 107 abstract Token getEndToken(); | |
| 108 | |
| 109 Block asBlock() => null; | |
| 110 BreakStatement asBreakStatement() => null; | |
| 111 CatchBlock asCatchBlock() => null; | |
| 112 ClassNode asClassNode() => null; | |
| 113 Conditional asConditional() => null; | |
| 114 ContinueStatement asContinueStatement() => null; | |
| 115 DoWhile asDoWhile() => null; | |
| 116 EmptyStatement asEmptyStatement() => null; | |
| 117 Expression asExpression() => null; | |
| 118 ExpressionStatement asExpressionStatement() => null; | |
| 119 For asFor() => null; | |
| 120 ForInStatement asForInStatement() => null; | |
| 121 FunctionDeclaration asFunctionDeclaration() => null; | |
| 122 FunctionExpression asFunctionExpression() => null; | |
| 123 Identifier asIdentifier() => null; | |
| 124 If asIf() => null; | |
| 125 LabeledStatement asLabeledStatement() => null; | |
| 126 LiteralBool asLiteralBool() => null; | |
| 127 LiteralDouble asLiteralDouble() => null; | |
| 128 LiteralInt asLiteralInt() => null; | |
| 129 LiteralList asLiteralList() => null; | |
| 130 LiteralMap asLiteralMap() => null; | |
| 131 LiteralMapEntry asLiteralMapEntry() => null; | |
| 132 LiteralNull asLiteralNull() => null; | |
| 133 LiteralString asLiteralString() => null; | |
| 134 Modifiers asModifiers() => null; | |
| 135 NamedArgument asNamedArgument() => null; | |
| 136 NodeList asNodeList() => null; | |
| 137 Operator asOperator() => null; | |
| 138 ParenthesizedExpression asParenthesizedExpression() => null; | |
| 139 Return asReturn() => null; | |
| 140 ScriptTag asScriptTag() => null; | |
| 141 Send asSend() => null; | |
| 142 SendSet asSendSet() => null; | |
| 143 Statement asStatement() => null; | |
| 144 StringInterpolation asStringInterpolation() => null; | |
| 145 StringInterpolationPart asStringInterpolationPart() => null; | |
| 146 StringJuxtaposition asStringJuxtaposition() => null; | |
| 147 SwitchCase asSwitchCase() => null; | |
| 148 SwitchStatement asSwitchStatement() => null; | |
| 149 Throw asThrow() => null; | |
| 150 TryStatement asTryStatement() => null; | |
| 151 TypeAnnotation asTypeAnnotation() => null; | |
| 152 Typedef asTypedef() => null; | |
| 153 TypeVariable asTypeVariable() => null; | |
| 154 VariableDefinitions asVariableDefinitions() => null; | |
| 155 While asWhile() => null; | |
| 156 | |
| 157 bool isValidBreakTarget() => false; | |
| 158 bool isValidContinueTarget() => false; | |
| 159 } | |
| 160 | |
| 161 class ClassNode extends Node { | |
| 162 final Identifier name; | |
| 163 final TypeAnnotation superclass; | |
| 164 final NodeList interfaces; | |
| 165 final NodeList typeParameters; | |
| 166 | |
| 167 // TODO(ahe, karlklose): the default keyword is not recorded. | |
| 168 final TypeAnnotation defaultClause; | |
| 169 | |
| 170 final Token beginToken; | |
| 171 final Token extendsKeyword; | |
| 172 final Token endToken; | |
| 173 | |
| 174 ClassNode(this.name, this.typeParameters, this.superclass, this.interfaces, | |
| 175 this.defaultClause, this.beginToken, this.extendsKeyword, | |
| 176 this.endToken); | |
| 177 | |
| 178 ClassNode asClassNode() => this; | |
| 179 | |
| 180 accept(Visitor visitor) => visitor.visitClassNode(this); | |
| 181 | |
| 182 visitChildren(Visitor visitor) { | |
| 183 if (name !== null) name.accept(visitor); | |
| 184 if (superclass !== null) superclass.accept(visitor); | |
| 185 if (interfaces !== null) interfaces.accept(visitor); | |
| 186 } | |
| 187 | |
| 188 bool get isInterface() => beginToken.stringValue === 'interface'; | |
| 189 | |
| 190 bool get isClass() => !isInterface; | |
| 191 | |
| 192 Token getBeginToken() => beginToken; | |
| 193 | |
| 194 Token getEndToken() => endToken; | |
| 195 } | |
| 196 | |
| 197 class Expression extends Node { | |
| 198 Expression(); | |
| 199 | |
| 200 Expression asExpression() => this; | |
| 201 | |
| 202 // TODO(ahe): make class abstract instead of adding an abstract method. | |
| 203 abstract accept(Visitor visitor); | |
| 204 } | |
| 205 | |
| 206 class Statement extends Node { | |
| 207 Statement(); | |
| 208 | |
| 209 Statement asStatement() => this; | |
| 210 | |
| 211 // TODO(ahe): make class abstract instead of adding an abstract method. | |
| 212 abstract accept(Visitor visitor); | |
| 213 | |
| 214 bool isValidBreakTarget() => true; | |
| 215 } | |
| 216 | |
| 217 /** | |
| 218 * A message send aka method invocation. In Dart, most operations can | |
| 219 * (and should) be considered as message sends. Getters and setters | |
| 220 * are just methods with a special syntax. Consequently, we model | |
| 221 * property access, assignment, operators, and method calls with this | |
| 222 * one node. | |
| 223 */ | |
| 224 class Send extends Expression { | |
| 225 final Node receiver; | |
| 226 final Node selector; | |
| 227 final NodeList argumentsNode; | |
| 228 Link<Node> get arguments() => argumentsNode.nodes; | |
| 229 | |
| 230 Send([this.receiver, this.selector, this.argumentsNode]); | |
| 231 Send.postfix(this.receiver, this.selector, [Node argument = null]) | |
| 232 : argumentsNode = (argument === null) | |
| 233 ? new Postfix() | |
| 234 : new Postfix.singleton(argument); | |
| 235 Send.prefix(this.receiver, this.selector, [Node argument = null]) | |
| 236 : argumentsNode = (argument === null) | |
| 237 ? new Prefix() | |
| 238 : new Prefix.singleton(argument); | |
| 239 | |
| 240 Send asSend() => this; | |
| 241 | |
| 242 accept(Visitor visitor) => visitor.visitSend(this); | |
| 243 | |
| 244 visitChildren(Visitor visitor) { | |
| 245 if (receiver !== null) receiver.accept(visitor); | |
| 246 if (selector !== null) selector.accept(visitor); | |
| 247 if (argumentsNode !== null) argumentsNode.accept(visitor); | |
| 248 } | |
| 249 | |
| 250 int argumentCount() => argumentsNode.length(); | |
| 251 | |
| 252 bool get isSuperCall() { | |
| 253 return receiver !== null && | |
| 254 receiver.asIdentifier() !== null && | |
| 255 receiver.asIdentifier().isSuper(); | |
| 256 } | |
| 257 bool get isOperator() => selector is Operator; | |
| 258 bool get isPropertyAccess() => argumentsNode === null; | |
| 259 bool get isFunctionObjectInvocation() => selector === null; | |
| 260 bool get isPrefix() => argumentsNode is Prefix; | |
| 261 bool get isPostfix() => argumentsNode is Postfix; | |
| 262 bool get isIndex() => | |
| 263 isOperator && selector.asOperator().source.stringValue === '[]'; | |
| 264 | |
| 265 Token getBeginToken() { | |
| 266 if (isPrefix && !isIndex) return selector.getBeginToken(); | |
| 267 return firstBeginToken(receiver, selector); | |
| 268 } | |
| 269 | |
| 270 Token getEndToken() { | |
| 271 if (isPrefix) { | |
| 272 if (receiver !== null) return receiver.getEndToken(); | |
| 273 if (selector !== null) return selector.getEndToken(); | |
| 274 return null; | |
| 275 } | |
| 276 if (!isPostfix && argumentsNode !== null) { | |
| 277 return argumentsNode.getEndToken(); | |
| 278 } | |
| 279 if (selector !== null) return selector.getEndToken(); | |
| 280 return receiver.getBeginToken(); | |
| 281 } | |
| 282 | |
| 283 Send copyWithReceiver(Node newReceiver) { | |
| 284 assert(receiver === null); | |
| 285 return new Send(newReceiver, selector, argumentsNode); | |
| 286 } | |
| 287 } | |
| 288 | |
| 289 class Postfix extends NodeList { | |
| 290 Postfix() : super(nodes: const EmptyLink<Node>()); | |
| 291 Postfix.singleton(Node argument) : super.singleton(argument); | |
| 292 } | |
| 293 | |
| 294 class Prefix extends NodeList { | |
| 295 Prefix() : super(nodes: const EmptyLink<Node>()); | |
| 296 Prefix.singleton(Node argument) : super.singleton(argument); | |
| 297 } | |
| 298 | |
| 299 class SendSet extends Send { | |
| 300 final Operator assignmentOperator; | |
| 301 SendSet(receiver, selector, this.assignmentOperator, argumentsNode) | |
| 302 : super(receiver, selector, argumentsNode); | |
| 303 SendSet.postfix(receiver, | |
| 304 selector, | |
| 305 this.assignmentOperator, | |
| 306 [Node argument = null]) | |
| 307 : super.postfix(receiver, selector, argument); | |
| 308 SendSet.prefix(receiver, | |
| 309 selector, | |
| 310 this.assignmentOperator, | |
| 311 [Node argument = null]) | |
| 312 : super.prefix(receiver, selector, argument); | |
| 313 | |
| 314 SendSet asSendSet() => this; | |
| 315 | |
| 316 accept(Visitor visitor) => visitor.visitSendSet(this); | |
| 317 | |
| 318 visitChildren(Visitor visitor) { | |
| 319 super.visitChildren(visitor); | |
| 320 if (assignmentOperator !== null) assignmentOperator.accept(visitor); | |
| 321 } | |
| 322 | |
| 323 Send copyWithReceiver(Node newReceiver) { | |
| 324 assert(receiver === null); | |
| 325 return new SendSet(newReceiver, selector, assignmentOperator, | |
| 326 argumentsNode); | |
| 327 } | |
| 328 } | |
| 329 | |
| 330 class NewExpression extends Expression { | |
| 331 /** The token NEW or CONST */ | |
| 332 final Token newToken; | |
| 333 | |
| 334 // Note: we expect that send.receiver is null. | |
| 335 final Send send; | |
| 336 | |
| 337 NewExpression([this.newToken, this.send]); | |
| 338 | |
| 339 accept(Visitor visitor) => visitor.visitNewExpression(this); | |
| 340 | |
| 341 visitChildren(Visitor visitor) { | |
| 342 if (send !== null) send.accept(visitor); | |
| 343 } | |
| 344 | |
| 345 bool isConst() => newToken.stringValue === 'const'; | |
| 346 | |
| 347 Token getBeginToken() => newToken; | |
| 348 | |
| 349 Token getEndToken() => send.getEndToken(); | |
| 350 } | |
| 351 | |
| 352 class NodeList extends Node implements Iterable<Node> { | |
| 353 final Link<Node> nodes; | |
| 354 final Token beginToken; | |
| 355 final Token endToken; | |
| 356 final SourceString delimiter; | |
| 357 bool isEmpty() => nodes.isEmpty(); | |
| 358 | |
| 359 NodeList([this.beginToken, this.nodes, this.endToken, this.delimiter]); | |
| 360 | |
| 361 Iterator<Node> iterator() => nodes.iterator(); | |
| 362 | |
| 363 NodeList.singleton(Node node) : this(null, new Link<Node>(node)); | |
| 364 NodeList.empty() : this(null, const EmptyLink<Node>()); | |
| 365 | |
| 366 NodeList asNodeList() => this; | |
| 367 | |
| 368 int length() { | |
| 369 int result = 0; | |
| 370 for (Link<Node> cursor = nodes; !cursor.isEmpty(); cursor = cursor.tail) { | |
| 371 result++; | |
| 372 } | |
| 373 return result; | |
| 374 } | |
| 375 | |
| 376 accept(Visitor visitor) => visitor.visitNodeList(this); | |
| 377 | |
| 378 visitChildren(Visitor visitor) { | |
| 379 if (nodes === null) return; | |
| 380 for (Link<Node> link = nodes; !link.isEmpty(); link = link.tail) { | |
| 381 if (link.head !== null) link.head.accept(visitor); | |
| 382 } | |
| 383 } | |
| 384 | |
| 385 Token getBeginToken() { | |
| 386 if (beginToken !== null) return beginToken; | |
| 387 if (nodes !== null) { | |
| 388 for (Link<Node> link = nodes; !link.isEmpty(); link = link.tail) { | |
| 389 if (link.head.getBeginToken() !== null) { | |
| 390 return link.head.getBeginToken(); | |
| 391 } | |
| 392 if (link.head.getEndToken() !== null) { | |
| 393 return link.head.getEndToken(); | |
| 394 } | |
| 395 } | |
| 396 } | |
| 397 return endToken; | |
| 398 } | |
| 399 | |
| 400 Token getEndToken() { | |
| 401 if (endToken !== null) return endToken; | |
| 402 if (nodes !== null) { | |
| 403 Link<Node> link = nodes; | |
| 404 if (link.isEmpty()) return beginToken; | |
| 405 while (!link.tail.isEmpty()) link = link.tail; | |
| 406 if (link.head.getEndToken() !== null) return link.head.getEndToken(); | |
| 407 if (link.head.getBeginToken() !== null) return link.head.getBeginToken(); | |
| 408 } | |
| 409 return beginToken; | |
| 410 } | |
| 411 } | |
| 412 | |
| 413 class Block extends Statement { | |
| 414 final NodeList statements; | |
| 415 | |
| 416 Block(this.statements); | |
| 417 | |
| 418 Block asBlock() => this; | |
| 419 | |
| 420 accept(Visitor visitor) => visitor.visitBlock(this); | |
| 421 | |
| 422 visitChildren(Visitor visitor) { | |
| 423 if (statements !== null) statements.accept(visitor); | |
| 424 } | |
| 425 | |
| 426 Token getBeginToken() => statements.getBeginToken(); | |
| 427 | |
| 428 Token getEndToken() => statements.getEndToken(); | |
| 429 } | |
| 430 | |
| 431 class If extends Statement { | |
| 432 final ParenthesizedExpression condition; | |
| 433 final Statement thenPart; | |
| 434 final Statement elsePart; | |
| 435 | |
| 436 final Token ifToken; | |
| 437 final Token elseToken; | |
| 438 | |
| 439 If(this.condition, this.thenPart, this.elsePart, | |
| 440 this.ifToken, this.elseToken); | |
| 441 | |
| 442 If asIf() => this; | |
| 443 | |
| 444 bool get hasElsePart() => elsePart !== null; | |
| 445 | |
| 446 void validate() { | |
| 447 // TODO(ahe): Check that condition has size one. | |
| 448 } | |
| 449 | |
| 450 accept(Visitor visitor) => visitor.visitIf(this); | |
| 451 | |
| 452 visitChildren(Visitor visitor) { | |
| 453 if (condition !== null) condition.accept(visitor); | |
| 454 if (thenPart !== null) thenPart.accept(visitor); | |
| 455 if (elsePart !== null) elsePart.accept(visitor); | |
| 456 } | |
| 457 | |
| 458 Token getBeginToken() => ifToken; | |
| 459 | |
| 460 Token getEndToken() { | |
| 461 if (elsePart === null) return thenPart.getEndToken(); | |
| 462 return elsePart.getEndToken(); | |
| 463 } | |
| 464 } | |
| 465 | |
| 466 class Conditional extends Expression { | |
| 467 final Expression condition; | |
| 468 final Expression thenExpression; | |
| 469 final Expression elseExpression; | |
| 470 | |
| 471 final Token questionToken; | |
| 472 final Token colonToken; | |
| 473 | |
| 474 Conditional(this.condition, this.thenExpression, | |
| 475 this.elseExpression, this.questionToken, this.colonToken); | |
| 476 | |
| 477 Conditional asConditional() => this; | |
| 478 | |
| 479 accept(Visitor visitor) => visitor.visitConditional(this); | |
| 480 | |
| 481 visitChildren(Visitor visitor) { | |
| 482 condition.accept(visitor); | |
| 483 thenExpression.accept(visitor); | |
| 484 elseExpression.accept(visitor); | |
| 485 } | |
| 486 | |
| 487 Token getBeginToken() => condition.getBeginToken(); | |
| 488 | |
| 489 Token getEndToken() => elseExpression.getEndToken(); | |
| 490 } | |
| 491 | |
| 492 class For extends Loop { | |
| 493 /** Either a variable declaration or an expression. */ | |
| 494 final Node initializer; | |
| 495 /** Either an expression statement or an empty statement. */ | |
| 496 final Statement conditionStatement; | |
| 497 final NodeList update; | |
| 498 | |
| 499 final Token forToken; | |
| 500 | |
| 501 For(this.initializer, this.conditionStatement, this.update, body, | |
| 502 this.forToken) : super(body); | |
| 503 | |
| 504 For asFor() => this; | |
| 505 | |
| 506 Expression get condition() { | |
| 507 if (conditionStatement is ExpressionStatement) { | |
| 508 return conditionStatement.asExpressionStatement().expression; | |
| 509 } else { | |
| 510 return null; | |
| 511 } | |
| 512 } | |
| 513 | |
| 514 accept(Visitor visitor) => visitor.visitFor(this); | |
| 515 | |
| 516 visitChildren(Visitor visitor) { | |
| 517 if (initializer !== null) initializer.accept(visitor); | |
| 518 if (conditionStatement !== null) conditionStatement.accept(visitor); | |
| 519 if (update !== null) update.accept(visitor); | |
| 520 if (body !== null) body.accept(visitor); | |
| 521 } | |
| 522 | |
| 523 Token getBeginToken() => forToken; | |
| 524 | |
| 525 Token getEndToken() { | |
| 526 return body.getEndToken(); | |
| 527 } | |
| 528 } | |
| 529 | |
| 530 class FunctionDeclaration extends Statement { | |
| 531 final FunctionExpression function; | |
| 532 | |
| 533 FunctionDeclaration(this.function); | |
| 534 | |
| 535 FunctionDeclaration asFunctionDeclaration() => this; | |
| 536 | |
| 537 accept(Visitor visitor) => visitor.visitFunctionDeclaration(this); | |
| 538 | |
| 539 visitChildren(Visitor visitor) => function.accept(visitor); | |
| 540 | |
| 541 Token getBeginToken() => function.getBeginToken(); | |
| 542 Token getEndToken() => function.getEndToken(); | |
| 543 } | |
| 544 | |
| 545 class FunctionExpression extends Expression { | |
| 546 final Node name; | |
| 547 | |
| 548 /** | |
| 549 * List of VariableDefinitions or NodeList. | |
| 550 * | |
| 551 * A NodeList can only occur at the end and holds named parameters. | |
| 552 */ | |
| 553 final NodeList parameters; | |
| 554 | |
| 555 final Statement body; | |
| 556 final TypeAnnotation returnType; | |
| 557 final Modifiers modifiers; | |
| 558 final NodeList initializers; | |
| 559 | |
| 560 final Token getOrSet; | |
| 561 | |
| 562 FunctionExpression(this.name, this.parameters, this.body, this.returnType, | |
| 563 this.modifiers, this.initializers, this.getOrSet); | |
| 564 | |
| 565 FunctionExpression asFunctionExpression() => this; | |
| 566 | |
| 567 accept(Visitor visitor) => visitor.visitFunctionExpression(this); | |
| 568 | |
| 569 visitChildren(Visitor visitor) { | |
| 570 if (modifiers !== null) modifiers.accept(visitor); | |
| 571 if (returnType !== null) returnType.accept(visitor); | |
| 572 if (name !== null) name.accept(visitor); | |
| 573 if (parameters !== null) parameters.accept(visitor); | |
| 574 if (initializers !== null) initializers.accept(visitor); | |
| 575 if (body !== null) body.accept(visitor); | |
| 576 } | |
| 577 | |
| 578 bool hasBody() { | |
| 579 // TODO(karlklose,ahe): refactor AST nodes (issue 1713). | |
| 580 if (body.asReturn() !== null) return true; | |
| 581 NodeList statements = body.asBlock().statements; | |
| 582 return (!statements.nodes.isEmpty() || | |
| 583 statements.getBeginToken().kind !== $SEMICOLON); | |
| 584 } | |
| 585 | |
| 586 Token getBeginToken() { | |
| 587 Token token = firstBeginToken(modifiers, returnType); | |
| 588 if (token !== null) return token; | |
| 589 if (getOrSet !== null) return getOrSet; | |
| 590 return firstBeginToken(name, parameters); | |
| 591 } | |
| 592 | |
| 593 Token getEndToken() { | |
| 594 Token token = (body === null) ? null : body.getEndToken(); | |
| 595 token = (token === null) ? parameters.getEndToken() : token; | |
| 596 return (token === null) ? name.getEndToken() : token; | |
| 597 } | |
| 598 } | |
| 599 | |
| 600 typedef void DecodeErrorHandler(Token token, var error); | |
| 601 | |
| 602 class Literal<T> extends Expression { | |
| 603 final Token token; | |
| 604 final DecodeErrorHandler handler; | |
| 605 | |
| 606 Literal(Token this.token, DecodeErrorHandler this.handler); | |
| 607 | |
| 608 abstract T get value(); | |
| 609 | |
| 610 visitChildren(Visitor visitor) {} | |
| 611 | |
| 612 Token getBeginToken() => token; | |
| 613 | |
| 614 Token getEndToken() => token; | |
| 615 } | |
| 616 | |
| 617 class LiteralInt extends Literal<int> { | |
| 618 LiteralInt(Token token, DecodeErrorHandler handler) : super(token, handler); | |
| 619 | |
| 620 LiteralInt asLiteralInt() => this; | |
| 621 | |
| 622 int get value() { | |
| 623 try { | |
| 624 Token token = this.token; | |
| 625 if (token.kind === PLUS_TOKEN) token = token.next; | |
| 626 return Math.parseInt(token.value.slowToString()); | |
| 627 } catch (BadNumberFormatException ex) { | |
| 628 (this.handler)(token, ex); | |
| 629 } | |
| 630 } | |
| 631 | |
| 632 accept(Visitor visitor) => visitor.visitLiteralInt(this); | |
| 633 } | |
| 634 | |
| 635 class LiteralDouble extends Literal<double> { | |
| 636 LiteralDouble(Token token, DecodeErrorHandler handler) | |
| 637 : super(token, handler); | |
| 638 | |
| 639 LiteralDouble asLiteralDouble() => this; | |
| 640 | |
| 641 double get value() { | |
| 642 try { | |
| 643 Token token = this.token; | |
| 644 if (token.kind === PLUS_TOKEN) token = token.next; | |
| 645 return Math.parseDouble(token.value.slowToString()); | |
| 646 } catch (BadNumberFormatException ex) { | |
| 647 (this.handler)(token, ex); | |
| 648 } | |
| 649 } | |
| 650 | |
| 651 accept(Visitor visitor) => visitor.visitLiteralDouble(this); | |
| 652 } | |
| 653 | |
| 654 class LiteralBool extends Literal<bool> { | |
| 655 LiteralBool(Token token, DecodeErrorHandler handler) : super(token, handler); | |
| 656 | |
| 657 LiteralBool asLiteralBool() => this; | |
| 658 | |
| 659 bool get value() { | |
| 660 switch (token.value) { | |
| 661 case Keyword.TRUE: return true; | |
| 662 case Keyword.FALSE: return false; | |
| 663 default: | |
| 664 (this.handler)(token, "not a bool ${token.value}"); | |
| 665 } | |
| 666 } | |
| 667 | |
| 668 accept(Visitor visitor) => visitor.visitLiteralBool(this); | |
| 669 } | |
| 670 | |
| 671 | |
| 672 class StringQuoting { | |
| 673 static final StringQuoting SINGLELINE_DQ = | |
| 674 const StringQuoting($DQ, raw: false, leftQuoteLength: 1); | |
| 675 static final StringQuoting RAW_SINGLELINE_DQ = | |
| 676 const StringQuoting($DQ, raw: true, leftQuoteLength: 1); | |
| 677 static final StringQuoting MULTILINE_DQ = | |
| 678 const StringQuoting($DQ, raw: false, leftQuoteLength: 3); | |
| 679 static final StringQuoting RAW_MULTILINE_DQ = | |
| 680 const StringQuoting($DQ, raw: true, leftQuoteLength: 3); | |
| 681 static final StringQuoting MULTILINE_NL_DQ = | |
| 682 const StringQuoting($DQ, raw: false, leftQuoteLength: 4); | |
| 683 static final StringQuoting RAW_MULTILINE_NL_DQ = | |
| 684 const StringQuoting($DQ, raw: true, leftQuoteLength: 4); | |
| 685 static final StringQuoting MULTILINE_NL2_DQ = | |
| 686 const StringQuoting($DQ, raw: false, leftQuoteLength: 5); | |
| 687 static final StringQuoting RAW_MULTILINE_NL2_DQ = | |
| 688 const StringQuoting($DQ, raw: true, leftQuoteLength: 5); | |
| 689 static final StringQuoting SINGLELINE_SQ = | |
| 690 const StringQuoting($SQ, raw: false, leftQuoteLength: 1); | |
| 691 static final StringQuoting RAW_SINGLELINE_SQ = | |
| 692 const StringQuoting($SQ, raw: true, leftQuoteLength: 1); | |
| 693 static final StringQuoting MULTILINE_SQ = | |
| 694 const StringQuoting($SQ, raw: false, leftQuoteLength: 3); | |
| 695 static final StringQuoting RAW_MULTILINE_SQ = | |
| 696 const StringQuoting($SQ, raw: true, leftQuoteLength: 3); | |
| 697 static final StringQuoting MULTILINE_NL_SQ = | |
| 698 const StringQuoting($SQ, raw: false, leftQuoteLength: 4); | |
| 699 static final StringQuoting RAW_MULTILINE_NL_SQ = | |
| 700 const StringQuoting($SQ, raw: true, leftQuoteLength: 4); | |
| 701 static final StringQuoting MULTILINE_NL2_SQ = | |
| 702 const StringQuoting($SQ, raw: false, leftQuoteLength: 5); | |
| 703 static final StringQuoting RAW_MULTILINE_NL2_SQ = | |
| 704 const StringQuoting($SQ, raw: true, leftQuoteLength: 5); | |
| 705 | |
| 706 | |
| 707 static final List<StringQuoting> mapping = const <StringQuoting>[ | |
| 708 SINGLELINE_DQ, | |
| 709 RAW_SINGLELINE_DQ, | |
| 710 MULTILINE_DQ, | |
| 711 RAW_MULTILINE_DQ, | |
| 712 MULTILINE_NL_DQ, | |
| 713 RAW_MULTILINE_NL_DQ, | |
| 714 MULTILINE_NL2_DQ, | |
| 715 RAW_MULTILINE_NL2_DQ, | |
| 716 SINGLELINE_SQ, | |
| 717 RAW_SINGLELINE_SQ, | |
| 718 MULTILINE_SQ, | |
| 719 RAW_MULTILINE_SQ, | |
| 720 MULTILINE_NL_SQ, | |
| 721 RAW_MULTILINE_NL_SQ, | |
| 722 MULTILINE_NL2_SQ, | |
| 723 RAW_MULTILINE_NL2_SQ | |
| 724 ]; | |
| 725 final bool raw; | |
| 726 final int leftQuoteCharCount; | |
| 727 final int quote; | |
| 728 const StringQuoting(this.quote, [bool raw, int leftQuoteLength]) | |
| 729 : this.raw = raw, this.leftQuoteCharCount = leftQuoteLength; | |
| 730 String get quoteChar() => quote === $DQ ? '"' : "'"; | |
| 731 | |
| 732 int get leftQuoteLength() => (raw ? 1 : 0) + leftQuoteCharCount; | |
| 733 int get rightQuoteLength() => (leftQuoteCharCount > 2) ? 3 : 1; | |
| 734 static StringQuoting getQuoting(int quote, bool raw, int quoteLength) { | |
| 735 int index = quoteLength - 1; | |
| 736 if (quoteLength > 2) index -= 1; | |
| 737 return mapping[(raw ? 1 : 0) + index * 2 + (quote === $SQ ? 8 : 0)]; | |
| 738 } | |
| 739 } | |
| 740 | |
| 741 /** | |
| 742 * Superclass for classes representing string literals. | |
| 743 */ | |
| 744 class StringNode extends Expression { | |
| 745 abstract DartString get dartString(); | |
| 746 abstract bool get isInterpolation(); | |
| 747 } | |
| 748 | |
| 749 class LiteralString extends StringNode { | |
| 750 final Token token; | |
| 751 /** Non-null on validated string literals. */ | |
| 752 final DartString dartString; | |
| 753 | |
| 754 LiteralString(this.token, this.dartString); | |
| 755 | |
| 756 LiteralString asLiteralString() => this; | |
| 757 | |
| 758 void visitChildren(Visitor visitor) {} | |
| 759 | |
| 760 bool get isInterpolation() => false; | |
| 761 bool isValidated() => dartString !== null; | |
| 762 | |
| 763 Token getBeginToken() => token; | |
| 764 Token getEndToken() => token; | |
| 765 | |
| 766 accept(Visitor visitor) => visitor.visitLiteralString(this); | |
| 767 } | |
| 768 | |
| 769 class LiteralNull extends Literal<SourceString> { | |
| 770 LiteralNull(Token token) : super(token, null); | |
| 771 | |
| 772 LiteralNull asLiteralNull() => this; | |
| 773 | |
| 774 SourceString get value() => null; | |
| 775 | |
| 776 accept(Visitor visitor) => visitor.visitLiteralNull(this); | |
| 777 } | |
| 778 | |
| 779 class LiteralList extends Expression { | |
| 780 final TypeAnnotation type; | |
| 781 final NodeList elements; | |
| 782 | |
| 783 final Token constKeyword; | |
| 784 | |
| 785 LiteralList(this.type, this.elements, this.constKeyword); | |
| 786 | |
| 787 bool isConst() => constKeyword !== null; | |
| 788 | |
| 789 LiteralList asLiteralList() => this; | |
| 790 accept(Visitor visitor) => visitor.visitLiteralList(this); | |
| 791 | |
| 792 visitChildren(Visitor visitor) { | |
| 793 if (type !== null) type.accept(visitor); | |
| 794 elements.accept(visitor); | |
| 795 } | |
| 796 | |
| 797 Token getBeginToken() { | |
| 798 if (constKeyword !== null) return constKeyword; | |
| 799 return firstBeginToken(type, elements); | |
| 800 } | |
| 801 | |
| 802 Token getEndToken() => elements.getEndToken(); | |
| 803 } | |
| 804 | |
| 805 class Identifier extends Expression { | |
| 806 final Token token; | |
| 807 | |
| 808 SourceString get source() => token.value; | |
| 809 | |
| 810 Identifier(Token this.token); | |
| 811 | |
| 812 bool isThis() => source.stringValue === 'this'; | |
| 813 | |
| 814 bool isSuper() => source.stringValue === 'super'; | |
| 815 | |
| 816 Identifier asIdentifier() => this; | |
| 817 | |
| 818 accept(Visitor visitor) => visitor.visitIdentifier(this); | |
| 819 | |
| 820 visitChildren(Visitor visitor) {} | |
| 821 | |
| 822 Token getBeginToken() => token; | |
| 823 | |
| 824 Token getEndToken() => token; | |
| 825 } | |
| 826 | |
| 827 class Operator extends Identifier { | |
| 828 Operator(Token token) : super(token); | |
| 829 | |
| 830 Operator asOperator() => this; | |
| 831 | |
| 832 accept(Visitor visitor) => visitor.visitOperator(this); | |
| 833 } | |
| 834 | |
| 835 class Return extends Statement { | |
| 836 final Expression expression; | |
| 837 final Token beginToken; | |
| 838 final Token endToken; | |
| 839 | |
| 840 Return(this.beginToken, this.endToken, this.expression); | |
| 841 | |
| 842 Return asReturn() => this; | |
| 843 | |
| 844 bool get hasExpression() => expression !== null; | |
| 845 | |
| 846 accept(Visitor visitor) => visitor.visitReturn(this); | |
| 847 | |
| 848 visitChildren(Visitor visitor) { | |
| 849 if (expression !== null) expression.accept(visitor); | |
| 850 } | |
| 851 | |
| 852 Token getBeginToken() => beginToken; | |
| 853 | |
| 854 Token getEndToken() { | |
| 855 if (endToken === null) return expression.getEndToken(); | |
| 856 return endToken; | |
| 857 } | |
| 858 } | |
| 859 | |
| 860 class ExpressionStatement extends Statement { | |
| 861 final Expression expression; | |
| 862 final Token endToken; | |
| 863 | |
| 864 ExpressionStatement(this.expression, this.endToken); | |
| 865 | |
| 866 ExpressionStatement asExpressionStatement() => this; | |
| 867 | |
| 868 accept(Visitor visitor) => visitor.visitExpressionStatement(this); | |
| 869 | |
| 870 visitChildren(Visitor visitor) { | |
| 871 if (expression !== null) expression.accept(visitor); | |
| 872 } | |
| 873 | |
| 874 Token getBeginToken() => expression.getBeginToken(); | |
| 875 | |
| 876 Token getEndToken() => endToken; | |
| 877 } | |
| 878 | |
| 879 class Throw extends Statement { | |
| 880 final Expression expression; | |
| 881 | |
| 882 final Token throwToken; | |
| 883 final Token endToken; | |
| 884 | |
| 885 Throw(this.expression, this.throwToken, this.endToken); | |
| 886 | |
| 887 Throw asThrow() => this; | |
| 888 | |
| 889 accept(Visitor visitor) => visitor.visitThrow(this); | |
| 890 | |
| 891 visitChildren(Visitor visitor) { | |
| 892 if (expression !== null) expression.accept(visitor); | |
| 893 } | |
| 894 | |
| 895 Token getBeginToken() => throwToken; | |
| 896 | |
| 897 Token getEndToken() => endToken; | |
| 898 } | |
| 899 | |
| 900 class TypeAnnotation extends Node { | |
| 901 final Expression typeName; | |
| 902 final NodeList typeArguments; | |
| 903 | |
| 904 TypeAnnotation(Expression this.typeName, NodeList this.typeArguments); | |
| 905 | |
| 906 TypeAnnotation asTypeAnnotation() => this; | |
| 907 | |
| 908 accept(Visitor visitor) => visitor.visitTypeAnnotation(this); | |
| 909 | |
| 910 visitChildren(Visitor visitor) { | |
| 911 typeName.accept(visitor); | |
| 912 if (typeArguments !== null) typeArguments.accept(visitor); | |
| 913 } | |
| 914 | |
| 915 Token getBeginToken() => typeName.getBeginToken(); | |
| 916 | |
| 917 Token getEndToken() => typeName.getEndToken(); | |
| 918 } | |
| 919 | |
| 920 class TypeVariable extends Node { | |
| 921 final Identifier name; | |
| 922 final TypeAnnotation bound; | |
| 923 TypeVariable(Identifier this.name, TypeAnnotation this.bound); | |
| 924 | |
| 925 accept(Visitor visitor) => visitor.visitTypeVariable(this); | |
| 926 | |
| 927 visitChildren(Visitor visitor) { | |
| 928 name.accept(visitor); | |
| 929 if (bound !== null) { | |
| 930 bound.accept(visitor); | |
| 931 } | |
| 932 } | |
| 933 | |
| 934 TypeVariable asTypeVariable() => this; | |
| 935 | |
| 936 Token getBeginToken() => name.getBeginToken(); | |
| 937 | |
| 938 Token getEndToken() { | |
| 939 return (bound !== null) ? bound.getEndToken() : name.getEndToken(); | |
| 940 } | |
| 941 } | |
| 942 | |
| 943 class VariableDefinitions extends Statement { | |
| 944 final Token endToken; | |
| 945 final TypeAnnotation type; | |
| 946 final Modifiers modifiers; | |
| 947 final NodeList definitions; | |
| 948 VariableDefinitions(this.type, this.modifiers, this.definitions, | |
| 949 this.endToken); | |
| 950 | |
| 951 VariableDefinitions asVariableDefinitions() => this; | |
| 952 | |
| 953 accept(Visitor visitor) => visitor.visitVariableDefinitions(this); | |
| 954 | |
| 955 visitChildren(Visitor visitor) { | |
| 956 if (type !== null) type.accept(visitor); | |
| 957 if (definitions !== null) definitions.accept(visitor); | |
| 958 } | |
| 959 | |
| 960 Token getBeginToken() { | |
| 961 return firstBeginToken(type, definitions); | |
| 962 } | |
| 963 | |
| 964 Token getEndToken() => endToken; | |
| 965 } | |
| 966 | |
| 967 class Loop extends Statement { | |
| 968 abstract Expression get condition(); | |
| 969 final Statement body; | |
| 970 | |
| 971 Loop(this.body); | |
| 972 | |
| 973 bool isValidContinueTarget() => true; | |
| 974 } | |
| 975 | |
| 976 class DoWhile extends Loop { | |
| 977 final Token doKeyword; | |
| 978 final Token whileKeyword; | |
| 979 final Token endToken; | |
| 980 | |
| 981 final Expression condition; | |
| 982 | |
| 983 DoWhile(Statement body, Expression this.condition, | |
| 984 Token this.doKeyword, Token this.whileKeyword, Token this.endToken) | |
| 985 : super(body); | |
| 986 | |
| 987 DoWhile asDoWhile() => this; | |
| 988 | |
| 989 accept(Visitor visitor) => visitor.visitDoWhile(this); | |
| 990 | |
| 991 visitChildren(Visitor visitor) { | |
| 992 if (condition !== null) condition.accept(visitor); | |
| 993 if (body !== null) body.accept(visitor); | |
| 994 } | |
| 995 | |
| 996 Token getBeginToken() => doKeyword; | |
| 997 | |
| 998 Token getEndToken() => endToken; | |
| 999 } | |
| 1000 | |
| 1001 class While extends Loop { | |
| 1002 final Token whileKeyword; | |
| 1003 final Expression condition; | |
| 1004 | |
| 1005 While(Expression this.condition, Statement body, | |
| 1006 Token this.whileKeyword) : super(body); | |
| 1007 | |
| 1008 While asWhile() => this; | |
| 1009 | |
| 1010 accept(Visitor visitor) => visitor.visitWhile(this); | |
| 1011 | |
| 1012 visitChildren(Visitor visitor) { | |
| 1013 if (condition !== null) condition.accept(visitor); | |
| 1014 if (body !== null) body.accept(visitor); | |
| 1015 } | |
| 1016 | |
| 1017 Token getBeginToken() => whileKeyword; | |
| 1018 | |
| 1019 Token getEndToken() => body.getEndToken(); | |
| 1020 } | |
| 1021 | |
| 1022 class ParenthesizedExpression extends Expression { | |
| 1023 final Expression expression; | |
| 1024 final BeginGroupToken beginToken; | |
| 1025 | |
| 1026 ParenthesizedExpression(Expression this.expression, | |
| 1027 BeginGroupToken this.beginToken); | |
| 1028 | |
| 1029 ParenthesizedExpression asParenthesizedExpression() => this; | |
| 1030 | |
| 1031 accept(Visitor visitor) => visitor.visitParenthesizedExpression(this); | |
| 1032 | |
| 1033 visitChildren(Visitor visitor) { | |
| 1034 if (expression !== null) expression.accept(visitor); | |
| 1035 } | |
| 1036 | |
| 1037 Token getBeginToken() => beginToken; | |
| 1038 | |
| 1039 Token getEndToken() => beginToken.endGroup; | |
| 1040 } | |
| 1041 | |
| 1042 /** Representation of modifiers such as static, abstract, final, etc. */ | |
| 1043 class Modifiers extends Node { | |
| 1044 /* TODO(ahe): The following should be validated relating to modifiers: | |
| 1045 * 1. The nodes must come in a certain order. | |
| 1046 * 2. The keywords "var" and "final" may not be used at the same time. | |
| 1047 * 3. The type of an element must be null if isVar() is true. | |
| 1048 */ | |
| 1049 | |
| 1050 final NodeList nodes; | |
| 1051 /** Bit pattern to easy check what modifiers are present. */ | |
| 1052 final int flags; | |
| 1053 | |
| 1054 static final int FLAG_STATIC = 1; | |
| 1055 static final int FLAG_ABSTRACT = FLAG_STATIC << 1; | |
| 1056 static final int FLAG_FINAL = FLAG_ABSTRACT << 1; | |
| 1057 static final int FLAG_VAR = FLAG_FINAL << 1; | |
| 1058 static final int FLAG_CONST = FLAG_VAR << 1; | |
| 1059 static final int FLAG_FACTORY = FLAG_CONST << 1; | |
| 1060 | |
| 1061 Modifiers(NodeList nodes) | |
| 1062 : this.nodes = nodes, flags = computeFlags(nodes.nodes); | |
| 1063 | |
| 1064 Modifiers.empty() : this(new NodeList.empty()); | |
| 1065 | |
| 1066 static int computeFlags(Link<Node> nodes) { | |
| 1067 int flags = 0; | |
| 1068 for (; !nodes.isEmpty(); nodes = nodes.tail) { | |
| 1069 String value = nodes.head.asIdentifier().source.stringValue; | |
| 1070 if (value === 'static') flags += FLAG_STATIC; | |
| 1071 else if (value === 'abstract') flags += FLAG_ABSTRACT; | |
| 1072 else if (value === 'final') flags += FLAG_FINAL; | |
| 1073 else if (value === 'var') flags += FLAG_VAR; | |
| 1074 else if (value === 'const') flags += FLAG_CONST; | |
| 1075 else if (value === 'factory') flags += FLAG_FACTORY; | |
| 1076 else throw 'internal error: ${nodes.head}'; | |
| 1077 } | |
| 1078 return flags; | |
| 1079 } | |
| 1080 | |
| 1081 Modifiers asModifiers() => this; | |
| 1082 Token getBeginToken() => nodes.getBeginToken(); | |
| 1083 Token getEndToken() => nodes.getEndToken(); | |
| 1084 accept(Visitor visitor) => visitor.visitModifiers(this); | |
| 1085 visitChildren(Visitor visitor) => nodes.accept(visitor); | |
| 1086 | |
| 1087 bool isStatic() => (flags & FLAG_STATIC) != 0; | |
| 1088 bool isAbstract() => (flags & FLAG_ABSTRACT) != 0; | |
| 1089 bool isFinal() => (flags & FLAG_FINAL) != 0; | |
| 1090 bool isVar() => (flags & FLAG_VAR) != 0; | |
| 1091 bool isConst() => (flags & FLAG_CONST) != 0; | |
| 1092 bool isFactory() => (flags & FLAG_FACTORY) != 0; | |
| 1093 } | |
| 1094 | |
| 1095 class StringInterpolation extends StringNode { | |
| 1096 final LiteralString string; | |
| 1097 final NodeList parts; | |
| 1098 | |
| 1099 StringInterpolation(this.string, this.parts); | |
| 1100 | |
| 1101 StringInterpolation asStringInterpolation() => this; | |
| 1102 | |
| 1103 DartString get dartString() => null; | |
| 1104 bool get isInterpolation() => true; | |
| 1105 | |
| 1106 accept(Visitor visitor) => visitor.visitStringInterpolation(this); | |
| 1107 | |
| 1108 visitChildren(Visitor visitor) { | |
| 1109 string.accept(visitor); | |
| 1110 parts.accept(visitor); | |
| 1111 } | |
| 1112 | |
| 1113 Token getBeginToken() => string.getBeginToken(); | |
| 1114 Token getEndToken() => parts.getEndToken(); | |
| 1115 } | |
| 1116 | |
| 1117 class StringInterpolationPart extends Node { | |
| 1118 final Expression expression; | |
| 1119 final LiteralString string; | |
| 1120 | |
| 1121 StringInterpolationPart(this.expression, this.string); | |
| 1122 | |
| 1123 StringInterpolationPart asStringInterpolationPart() => this; | |
| 1124 | |
| 1125 accept(Visitor visitor) => visitor.visitStringInterpolationPart(this); | |
| 1126 | |
| 1127 visitChildren(Visitor visitor) { | |
| 1128 expression.accept(visitor); | |
| 1129 string.accept(visitor); | |
| 1130 } | |
| 1131 | |
| 1132 Token getBeginToken() => expression.getBeginToken(); | |
| 1133 | |
| 1134 Token getEndToken() => string.getEndToken(); | |
| 1135 } | |
| 1136 | |
| 1137 /** | |
| 1138 * A class representing juxtaposed string literals. | |
| 1139 * The string literals can be both plain literals and string interpolations. | |
| 1140 */ | |
| 1141 class StringJuxtaposition extends StringNode { | |
| 1142 final Expression first; | |
| 1143 final Expression second; | |
| 1144 | |
| 1145 /** | |
| 1146 * Caches the check for whether this juxtaposition contains a string | |
| 1147 * interpolation | |
| 1148 */ | |
| 1149 bool isInterpolationCache = null; | |
| 1150 | |
| 1151 /** | |
| 1152 * Caches a Dart string representation of the entire juxtaposition's | |
| 1153 * content. Only juxtapositions that don't (transitively) contains | |
| 1154 * interpolations have a static representation. | |
| 1155 */ | |
| 1156 DartString dartStringCache = null; | |
| 1157 | |
| 1158 StringJuxtaposition(this.first, this.second); | |
| 1159 | |
| 1160 StringJuxtaposition asStringJuxtaposition() => this; | |
| 1161 | |
| 1162 bool get isInterpolation() { | |
| 1163 if (isInterpolationCache === null) { | |
| 1164 isInterpolationCache = (first.accept(const IsInterpolationVisitor()) || | |
| 1165 second.accept(const IsInterpolationVisitor())); | |
| 1166 } | |
| 1167 return isInterpolationCache; | |
| 1168 } | |
| 1169 | |
| 1170 /** | |
| 1171 * Retrieve a single DartString that represents this entire juxtaposition | |
| 1172 * of string literals. | |
| 1173 * Should only be called if [isInterpolation] returns false. | |
| 1174 */ | |
| 1175 DartString get dartString() { | |
| 1176 if (isInterpolation) { | |
| 1177 throw new NodeAssertionFailure(this, | |
| 1178 "Getting dartString on interpolation;"); | |
| 1179 } | |
| 1180 if (dartStringCache === null) { | |
| 1181 DartString firstString = first.accept(const GetDartStringVisitor()); | |
| 1182 DartString secondString = second.accept(const GetDartStringVisitor()); | |
| 1183 if (firstString === null || secondString === null) { | |
| 1184 return null; | |
| 1185 } | |
| 1186 dartStringCache = new DartString.concat(firstString, secondString); | |
| 1187 } | |
| 1188 return dartStringCache; | |
| 1189 } | |
| 1190 | |
| 1191 accept(Visitor visitor) => visitor.visitStringJuxtaposition(this); | |
| 1192 | |
| 1193 void visitChildren(Visitor visitor) { | |
| 1194 first.accept(visitor); | |
| 1195 second.accept(visitor); | |
| 1196 } | |
| 1197 | |
| 1198 Token getBeginToken() => first.getBeginToken(); | |
| 1199 | |
| 1200 Token getEndToken() => second.getEndToken(); | |
| 1201 } | |
| 1202 | |
| 1203 class EmptyStatement extends Statement { | |
| 1204 final Token semicolonToken; | |
| 1205 | |
| 1206 EmptyStatement(this.semicolonToken); | |
| 1207 | |
| 1208 EmptyStatement asEmptyStatement() => this; | |
| 1209 | |
| 1210 accept(Visitor visitor) => visitor.visitEmptyStatement(this); | |
| 1211 | |
| 1212 visitChildren(Visitor visitor) {} | |
| 1213 | |
| 1214 Token getBeginToken() => semicolonToken; | |
| 1215 | |
| 1216 Token getEndToken() => semicolonToken; | |
| 1217 } | |
| 1218 | |
| 1219 class LiteralMap extends Expression { | |
| 1220 final NodeList typeArguments; | |
| 1221 final NodeList entries; | |
| 1222 | |
| 1223 LiteralMap(this.typeArguments, this.entries); | |
| 1224 | |
| 1225 bool isConst() => false; // TODO(ahe): Store constness. | |
| 1226 | |
| 1227 LiteralMap asLiteralMap() => this; | |
| 1228 | |
| 1229 accept(Visitor visitor) => visitor.visitLiteralMap(this); | |
| 1230 | |
| 1231 visitChildren(Visitor visitor) { | |
| 1232 if (typeArguments != null) typeArguments.accept(visitor); | |
| 1233 entries.accept(visitor); | |
| 1234 } | |
| 1235 | |
| 1236 Token getBeginToken() => firstBeginToken(typeArguments, entries); | |
| 1237 | |
| 1238 Token getEndToken() => entries.getEndToken(); | |
| 1239 } | |
| 1240 | |
| 1241 class LiteralMapEntry extends Node { | |
| 1242 final Expression key; | |
| 1243 final Expression value; | |
| 1244 | |
| 1245 final Token colonToken; | |
| 1246 | |
| 1247 LiteralMapEntry(this.key, this.colonToken, this.value); | |
| 1248 | |
| 1249 LiteralMapEntry asLiteralMapEntry() => this; | |
| 1250 | |
| 1251 accept(Visitor visitor) => visitor.visitLiteralMapEntry(this); | |
| 1252 | |
| 1253 visitChildren(Visitor visitor) { | |
| 1254 key.accept(visitor); | |
| 1255 value.accept(visitor); | |
| 1256 } | |
| 1257 | |
| 1258 Token getBeginToken() => key.getBeginToken(); | |
| 1259 | |
| 1260 Token getEndToken() => value.getEndToken(); | |
| 1261 } | |
| 1262 | |
| 1263 class NamedArgument extends Expression { | |
| 1264 final Identifier name; | |
| 1265 final Expression expression; | |
| 1266 | |
| 1267 final Token colonToken; | |
| 1268 | |
| 1269 NamedArgument(this.name, this.colonToken, this.expression); | |
| 1270 | |
| 1271 NamedArgument asNamedArgument() => this; | |
| 1272 | |
| 1273 accept(Visitor visitor) => visitor.visitNamedArgument(this); | |
| 1274 | |
| 1275 visitChildren(Visitor visitor) { | |
| 1276 name.accept(visitor); | |
| 1277 expression.accept(visitor); | |
| 1278 } | |
| 1279 | |
| 1280 Token getBeginToken() => name.getBeginToken(); | |
| 1281 | |
| 1282 Token getEndToken() => expression.getEndToken(); | |
| 1283 } | |
| 1284 | |
| 1285 class SwitchStatement extends Statement { | |
| 1286 final ParenthesizedExpression parenthesizedExpression; | |
| 1287 final NodeList cases; | |
| 1288 | |
| 1289 final Token switchKeyword; | |
| 1290 | |
| 1291 SwitchStatement(this.parenthesizedExpression, this.cases, | |
| 1292 this.switchKeyword); | |
| 1293 | |
| 1294 SwitchStatement asSwitchStatement() => this; | |
| 1295 | |
| 1296 Expression get expression() => parenthesizedExpression.expression; | |
| 1297 | |
| 1298 accept(Visitor visitor) => visitor.visitSwitchStatement(this); | |
| 1299 | |
| 1300 visitChildren(Visitor visitor) { | |
| 1301 parenthesizedExpression.accept(visitor); | |
| 1302 cases.accept(visitor); | |
| 1303 } | |
| 1304 | |
| 1305 Token getBeginToken() => switchKeyword; | |
| 1306 | |
| 1307 Token getEndToken() => cases.getEndToken(); | |
| 1308 } | |
| 1309 | |
| 1310 class SwitchCase extends Node { | |
| 1311 // Represents the grammar: | |
| 1312 // label? ('case' expression ':')* ('default' ':')? statement* | |
| 1313 // Each expression is collected in [expressions]. | |
| 1314 // The 'case' keywords can be obtained using [caseKeywords()]. | |
| 1315 // Any actual switch case must have at least one 'case' or 'default' | |
| 1316 // clause. | |
| 1317 final Identifier label; | |
| 1318 final NodeList expressions; | |
| 1319 final Token defaultKeyword; | |
| 1320 final NodeList statements; | |
| 1321 | |
| 1322 final Token startToken; | |
| 1323 | |
| 1324 SwitchCase(this.label, this.expressions, this.defaultKeyword, | |
| 1325 this.statements, this.startToken); | |
| 1326 | |
| 1327 SwitchCase asSwitchCase() => this; | |
| 1328 | |
| 1329 bool get isDefaultCase() => defaultKeyword !== null; | |
| 1330 | |
| 1331 accept(Visitor visitor) => visitor.visitSwitchCase(this); | |
| 1332 | |
| 1333 visitChildren(Visitor visitor) { | |
| 1334 if (label !== null) label.accept(visitor); | |
| 1335 expressions.accept(visitor); | |
| 1336 statements.accept(visitor); | |
| 1337 } | |
| 1338 | |
| 1339 Token getBeginToken() { | |
| 1340 return startToken; | |
| 1341 } | |
| 1342 | |
| 1343 Token getEndToken() { | |
| 1344 if (statements.nodes.isEmpty()) { | |
| 1345 // All cases must have at least one expression or be the default. | |
| 1346 if (defaultKeyword !== null) { | |
| 1347 // The colon after 'default'. | |
| 1348 return defaultKeyword.next; | |
| 1349 } | |
| 1350 // The colon after the expression. | |
| 1351 return expressions.getEndToken().next; | |
| 1352 } else { | |
| 1353 return statements.getEndToken(); | |
| 1354 } | |
| 1355 } | |
| 1356 | |
| 1357 Link<Token> caseKeywords() { | |
| 1358 Token token = startToken; | |
| 1359 if (label !== null) { | |
| 1360 // Skip past the label: <Identifier> ':'. | |
| 1361 token = token.next.next; | |
| 1362 } | |
| 1363 Link<Token> recursiveGetCases(Token token, Link<Expression> expressions) { | |
| 1364 if (token.stringValue === 'case') { | |
| 1365 Token colon = expressions.head.getEndToken().next; | |
| 1366 return new Link<Token>(token, | |
| 1367 recursiveGetCases(colon.next, expressions.tail)); | |
| 1368 } | |
| 1369 return const EmptyLink<Token>(); | |
| 1370 } | |
| 1371 return recursiveGetCases(token, expressions); | |
| 1372 } | |
| 1373 } | |
| 1374 | |
| 1375 class GotoStatement extends Statement { | |
| 1376 final Identifier target; | |
| 1377 final Token keywordToken; | |
| 1378 final Token semicolonToken; | |
| 1379 | |
| 1380 GotoStatement(this.target, this.keywordToken, this.semicolonToken); | |
| 1381 | |
| 1382 visitChildren(Visitor visitor) { | |
| 1383 if (target !== null) target.accept(visitor); | |
| 1384 } | |
| 1385 | |
| 1386 Token getBeginToken() => keywordToken; | |
| 1387 | |
| 1388 Token getEndToken() => semicolonToken; | |
| 1389 | |
| 1390 // TODO(ahe): make class abstract instead of adding an abstract method. | |
| 1391 abstract accept(Visitor visitor); | |
| 1392 } | |
| 1393 | |
| 1394 class BreakStatement extends GotoStatement { | |
| 1395 BreakStatement(Identifier target, Token keywordToken, Token semicolonToken) | |
| 1396 : super(target, keywordToken, semicolonToken); | |
| 1397 | |
| 1398 BreakStatement asBreakStatement() => this; | |
| 1399 | |
| 1400 accept(Visitor visitor) => visitor.visitBreakStatement(this); | |
| 1401 } | |
| 1402 | |
| 1403 class ContinueStatement extends GotoStatement { | |
| 1404 ContinueStatement(Identifier target, Token keywordToken, Token semicolonToken) | |
| 1405 : super(target, keywordToken, semicolonToken); | |
| 1406 | |
| 1407 ContinueStatement asContinueStatement() => this; | |
| 1408 | |
| 1409 accept(Visitor visitor) => visitor.visitContinueStatement(this); | |
| 1410 } | |
| 1411 | |
| 1412 class ForInStatement extends Loop { | |
| 1413 final Node declaredIdentifier; | |
| 1414 final Expression expression; | |
| 1415 | |
| 1416 final Token forToken; | |
| 1417 final Token inToken; | |
| 1418 | |
| 1419 ForInStatement(this.declaredIdentifier, this.expression, | |
| 1420 Statement body, this.forToken, this.inToken) : super(body); | |
| 1421 | |
| 1422 Expression get condition() => null; | |
| 1423 | |
| 1424 ForInStatement asForInStatement() => this; | |
| 1425 | |
| 1426 accept(Visitor visitor) => visitor.visitForInStatement(this); | |
| 1427 | |
| 1428 visitChildren(Visitor visitor) { | |
| 1429 declaredIdentifier.accept(visitor); | |
| 1430 expression.accept(visitor); | |
| 1431 body.accept(visitor); | |
| 1432 } | |
| 1433 | |
| 1434 Token getBeginToken() => forToken; | |
| 1435 | |
| 1436 Token getEndToken() => body.getEndToken(); | |
| 1437 } | |
| 1438 | |
| 1439 class LabeledStatement extends Statement { | |
| 1440 final Identifier label; | |
| 1441 final Token colonToken; | |
| 1442 final Statement statement; | |
| 1443 | |
| 1444 LabeledStatement(this.label, this.colonToken, this.statement); | |
| 1445 | |
| 1446 LabeledStatement asLabeledStatement() => this; | |
| 1447 | |
| 1448 accept(Visitor visitor) => visitor.visitLabeledStatement(this); | |
| 1449 | |
| 1450 visitChildren(Visitor visitor) { | |
| 1451 label.accept(visitor); | |
| 1452 statement.accept(visitor); | |
| 1453 } | |
| 1454 | |
| 1455 Token getBeginToken() => label.getBeginToken(); | |
| 1456 | |
| 1457 Token getEndToken() => statement.getEndToken(); | |
| 1458 | |
| 1459 bool isValidContinueTarget() => statement.isValidContinueTarget(); | |
| 1460 | |
| 1461 Node getBody() { | |
| 1462 if (statement is! LabeledStatement) return statement; | |
| 1463 LabeledStatement labeled = statement; | |
| 1464 return labeled.getBody(); | |
| 1465 } | |
| 1466 } | |
| 1467 | |
| 1468 class ScriptTag extends Node { | |
| 1469 final Identifier tag; | |
| 1470 final StringNode argument; | |
| 1471 final Identifier prefixIdentifier; | |
| 1472 final StringNode prefix; | |
| 1473 | |
| 1474 final Token beginToken; | |
| 1475 final Token endToken; | |
| 1476 | |
| 1477 ScriptTag(this.tag, this.argument, this.prefixIdentifier, this.prefix, | |
| 1478 this.beginToken, this.endToken); | |
| 1479 | |
| 1480 bool isImport() => tag.source == const SourceString("import"); | |
| 1481 bool isSource() => tag.source == const SourceString("source"); | |
| 1482 bool isLibrary() => tag.source == const SourceString("library"); | |
| 1483 bool isResource() => tag.source == const SourceString("resource"); | |
| 1484 | |
| 1485 ScriptTag asScriptTag() => this; | |
| 1486 | |
| 1487 accept(Visitor visitor) => visitor.visitScriptTag(this); | |
| 1488 | |
| 1489 visitChildren(Visitor visitor) { | |
| 1490 tag.accept(visitor); | |
| 1491 argument.accept(visitor); | |
| 1492 if (prefixIdentifier !== null) prefixIdentifier.accept(visitor); | |
| 1493 if (prefix !== null) prefix.accept(visitor); | |
| 1494 } | |
| 1495 | |
| 1496 Token getBeginToken() => beginToken; | |
| 1497 | |
| 1498 Token getEndToken() => endToken; | |
| 1499 } | |
| 1500 | |
| 1501 class Typedef extends Node { | |
| 1502 final TypeAnnotation returnType; | |
| 1503 final Identifier name; | |
| 1504 final NodeList typeParameters; | |
| 1505 final NodeList formals; | |
| 1506 | |
| 1507 final Token typedefKeyword; | |
| 1508 final Token endToken; | |
| 1509 | |
| 1510 Typedef(this.returnType, this.name, this.typeParameters, this.formals, | |
| 1511 this.typedefKeyword, this.endToken); | |
| 1512 | |
| 1513 Typedef asTypedef() => this; | |
| 1514 | |
| 1515 accept(Visitor visitor) => visitor.visitTypedef(this); | |
| 1516 | |
| 1517 visitChildren(Visitor visitor) { | |
| 1518 if (returnType !== null) returnType.accept(visitor); | |
| 1519 name.accept(visitor); | |
| 1520 if (typeParameters !== null) typeParameters.accept(visitor); | |
| 1521 formals.accept(visitor); | |
| 1522 } | |
| 1523 | |
| 1524 Token getBeginToken() => typedefKeyword; | |
| 1525 | |
| 1526 Token getEndToken() => endToken; | |
| 1527 } | |
| 1528 | |
| 1529 class TryStatement extends Statement { | |
| 1530 final Block tryBlock; | |
| 1531 final NodeList catchBlocks; | |
| 1532 final Block finallyBlock; | |
| 1533 | |
| 1534 final Token tryKeyword; | |
| 1535 final Token finallyKeyword; | |
| 1536 | |
| 1537 TryStatement(this.tryBlock, this.catchBlocks, this.finallyBlock, | |
| 1538 this.tryKeyword, this.finallyKeyword); | |
| 1539 | |
| 1540 TryStatement asTryStatement() => this; | |
| 1541 | |
| 1542 accept(Visitor visitor) => visitor.visitTryStatement(this); | |
| 1543 | |
| 1544 visitChildren(Visitor visitor) { | |
| 1545 tryBlock.accept(visitor); | |
| 1546 catchBlocks.accept(visitor); | |
| 1547 if (finallyBlock !== null) finallyBlock.accept(visitor); | |
| 1548 } | |
| 1549 | |
| 1550 Token getBeginToken() => tryKeyword; | |
| 1551 | |
| 1552 Token getEndToken() { | |
| 1553 if (finallyBlock !== null) return finallyBlock.getEndToken(); | |
| 1554 if (!catchBlocks.isEmpty()) return catchBlocks.getEndToken(); | |
| 1555 return tryBlock.getEndToken(); | |
| 1556 } | |
| 1557 } | |
| 1558 | |
| 1559 class CatchBlock extends Node { | |
| 1560 final NodeList formals; | |
| 1561 final Block block; | |
| 1562 | |
| 1563 final catchKeyword; | |
| 1564 | |
| 1565 CatchBlock(this.formals, this.block, this.catchKeyword); | |
| 1566 | |
| 1567 CatchBlock asCatchBlock() => this; | |
| 1568 | |
| 1569 accept(Visitor visitor) => visitor.visitCatchBlock(this); | |
| 1570 | |
| 1571 Node get exception() { | |
| 1572 if (formals.nodes.isEmpty()) return null; | |
| 1573 VariableDefinitions declarations = formals.nodes.head; | |
| 1574 return declarations.definitions.nodes.head; | |
| 1575 } | |
| 1576 | |
| 1577 Node get trace() { | |
| 1578 if (formals.nodes.isEmpty()) return null; | |
| 1579 Link<Node> declarations = formals.nodes.tail; | |
| 1580 if (declarations.isEmpty()) return null; | |
| 1581 VariableDefinitions head = declarations.head; | |
| 1582 return head.definitions.nodes.head; | |
| 1583 } | |
| 1584 | |
| 1585 visitChildren(Visitor visitor) { | |
| 1586 formals.accept(visitor); | |
| 1587 block.accept(visitor); | |
| 1588 } | |
| 1589 | |
| 1590 Token getBeginToken() => catchKeyword; | |
| 1591 | |
| 1592 Token getEndToken() => block.getEndToken(); | |
| 1593 } | |
| 1594 | |
| 1595 class Initializers { | |
| 1596 static bool isSuperConstructorCall(Send node) { | |
| 1597 return (node.receiver === null && | |
| 1598 node.selector.asIdentifier() !== null && | |
| 1599 node.selector.asIdentifier().isSuper()) || | |
| 1600 (node.receiver !== null && | |
| 1601 node.receiver.asIdentifier() !== null && | |
| 1602 node.receiver.asIdentifier().isSuper() && | |
| 1603 node.selector.asIdentifier() !== null); | |
| 1604 } | |
| 1605 | |
| 1606 static bool isConstructorRedirect(Send node) { | |
| 1607 return (node.receiver === null && | |
| 1608 node.selector.asIdentifier() !== null && | |
| 1609 node.selector.asIdentifier().isThis()) || | |
| 1610 (node.receiver !== null && | |
| 1611 node.receiver.asIdentifier() !== null && | |
| 1612 node.receiver.asIdentifier().isThis() && | |
| 1613 node.selector.asIdentifier() !== null); | |
| 1614 } | |
| 1615 } | |
| 1616 | |
| 1617 class GetDartStringVisitor extends AbstractVisitor<DartString> { | |
| 1618 const GetDartStringVisitor(); | |
| 1619 DartString visitNode(Node node) => null; | |
| 1620 DartString visitStringJuxtaposition(StringJuxtaposition node) | |
| 1621 => node.dartString; | |
| 1622 DartString visitLiteralString(LiteralString node) => node.dartString; | |
| 1623 } | |
| 1624 | |
| 1625 class IsInterpolationVisitor extends AbstractVisitor<bool> { | |
| 1626 const IsInterpolationVisitor(); | |
| 1627 bool visitNode(Node node) => false; | |
| 1628 bool visitStringInterpolation(StringInterpolation node) => true; | |
| 1629 bool visitStringJuxtaposition(StringJuxtaposition node) | |
| 1630 => node.isInterpolation; | |
| 1631 } | |
| 1632 | |
| 1633 /** | |
| 1634 * If the given node is a send set, it visits its initializer (first | |
| 1635 * argument). | |
| 1636 * | |
| 1637 * TODO(ahe): This method is controversial, the team needs to discuss | |
| 1638 * if top-level methods are acceptable and what naming conventions to | |
| 1639 * use. | |
| 1640 */ | |
| 1641 initializerDo(Node node, f(Node node)) { | |
| 1642 SendSet send = node.asSendSet(); | |
| 1643 if (send !== null) return f(send.arguments.head); | |
| 1644 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 9873021:
Move frog/leg to lib/compiler/implementation. (Closed)
Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/