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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 part of js_ast; | |
| 6 | |
| 7 abstract class NodeVisitor<T> { | |
| 8 T visitProgram(Program node); | |
| 9 | |
| 10 T visitBlock(Block node); | |
| 11 T visitExpressionStatement(ExpressionStatement node); | |
| 12 T visitEmptyStatement(EmptyStatement node); | |
| 13 T visitIf(If node); | |
| 14 T visitFor(For node); | |
| 15 T visitForIn(ForIn node); | |
| 16 T visitWhile(While node); | |
| 17 T visitDo(Do node); | |
| 18 T visitContinue(Continue node); | |
| 19 T visitBreak(Break node); | |
| 20 T visitReturn(Return node); | |
| 21 T visitThrow(Throw node); | |
| 22 T visitTry(Try node); | |
| 23 T visitCatch(Catch node); | |
| 24 T visitSwitch(Switch node); | |
| 25 T visitCase(Case node); | |
| 26 T visitDefault(Default node); | |
| 27 T visitFunctionDeclaration(FunctionDeclaration node); | |
| 28 T visitLabeledStatement(LabeledStatement node); | |
| 29 T visitLiteralStatement(LiteralStatement node); | |
| 30 T visitDartYield(DartYield node); | |
| 31 | |
| 32 T visitLiteralExpression(LiteralExpression node); | |
| 33 T visitVariableDeclarationList(VariableDeclarationList node); | |
| 34 T visitAssignment(Assignment node); | |
| 35 T visitVariableInitialization(VariableInitialization node); | |
| 36 T visitConditional(Conditional cond); | |
| 37 T visitNew(New node); | |
| 38 T visitCall(Call node); | |
| 39 T visitBinary(Binary node); | |
| 40 T visitPrefix(Prefix node); | |
| 41 T visitPostfix(Postfix node); | |
| 42 | |
| 43 T visitVariableUse(VariableUse node); | |
| 44 T visitThis(This node); | |
| 45 T visitVariableDeclaration(VariableDeclaration node); | |
| 46 T visitParameter(Parameter node); | |
| 47 T visitAccess(PropertyAccess node); | |
| 48 | |
| 49 T visitNamedFunction(NamedFunction node); | |
| 50 T visitFun(Fun node); | |
| 51 | |
| 52 T visitLiteralBool(LiteralBool node); | |
| 53 T visitLiteralString(LiteralString node); | |
| 54 T visitLiteralNumber(LiteralNumber node); | |
| 55 T visitLiteralNull(LiteralNull node); | |
| 56 | |
| 57 T visitArrayInitializer(ArrayInitializer node); | |
| 58 T visitArrayHole(ArrayHole node); | |
| 59 T visitObjectInitializer(ObjectInitializer node); | |
| 60 T visitProperty(Property node); | |
| 61 T visitRegExpLiteral(RegExpLiteral node); | |
| 62 | |
| 63 T visitAwait(Await node); | |
| 64 | |
| 65 T visitComment(Comment node); | |
| 66 | |
| 67 T visitInterpolatedExpression(InterpolatedExpression node); | |
| 68 T visitInterpolatedLiteral(InterpolatedLiteral node); | |
| 69 T visitInterpolatedParameter(InterpolatedParameter node); | |
| 70 T visitInterpolatedSelector(InterpolatedSelector node); | |
| 71 T visitInterpolatedStatement(InterpolatedStatement node); | |
| 72 } | |
| 73 | |
| 74 class BaseVisitor<T> implements NodeVisitor<T> { | |
| 75 T visitNode(Node node) { | |
| 76 node.visitChildren(this); | |
| 77 return null; | |
| 78 } | |
| 79 | |
| 80 T visitProgram(Program node) => visitNode(node); | |
| 81 | |
| 82 T visitStatement(Statement node) => visitNode(node); | |
| 83 T visitLoop(Loop node) => visitStatement(node); | |
| 84 T visitJump(Statement node) => visitStatement(node); | |
| 85 | |
| 86 T visitBlock(Block node) => visitStatement(node); | |
| 87 T visitExpressionStatement(ExpressionStatement node) | |
| 88 => visitStatement(node); | |
| 89 T visitEmptyStatement(EmptyStatement node) => visitStatement(node); | |
| 90 T visitIf(If node) => visitStatement(node); | |
| 91 T visitFor(For node) => visitLoop(node); | |
| 92 T visitForIn(ForIn node) => visitLoop(node); | |
| 93 T visitWhile(While node) => visitLoop(node); | |
| 94 T visitDo(Do node) => visitLoop(node); | |
| 95 T visitContinue(Continue node) => visitJump(node); | |
| 96 T visitBreak(Break node) => visitJump(node); | |
| 97 T visitReturn(Return node) => visitJump(node); | |
| 98 T visitThrow(Throw node) => visitJump(node); | |
| 99 T visitTry(Try node) => visitStatement(node); | |
| 100 T visitSwitch(Switch node) => visitStatement(node); | |
| 101 T visitFunctionDeclaration(FunctionDeclaration node) | |
| 102 => visitStatement(node); | |
| 103 T visitLabeledStatement(LabeledStatement node) => visitStatement(node); | |
| 104 T visitLiteralStatement(LiteralStatement node) => visitStatement(node); | |
| 105 | |
| 106 T visitCatch(Catch node) => visitNode(node); | |
| 107 T visitCase(Case node) => visitNode(node); | |
| 108 T visitDefault(Default node) => visitNode(node); | |
| 109 | |
| 110 T visitExpression(Expression node) => visitNode(node); | |
| 111 T visitVariableReference(VariableReference node) => visitExpression(node); | |
| 112 | |
| 113 T visitLiteralExpression(LiteralExpression node) => visitExpression(node); | |
| 114 T visitVariableDeclarationList(VariableDeclarationList node) | |
| 115 => visitExpression(node); | |
| 116 T visitAssignment(Assignment node) => visitExpression(node); | |
| 117 T visitVariableInitialization(VariableInitialization node) { | |
| 118 if (node.value != null) { | |
| 119 return visitAssignment(node); | |
| 120 } else { | |
| 121 return visitExpression(node); | |
| 122 } | |
| 123 } | |
| 124 T visitConditional(Conditional node) => visitExpression(node); | |
| 125 T visitNew(New node) => visitExpression(node); | |
| 126 T visitCall(Call node) => visitExpression(node); | |
| 127 T visitBinary(Binary node) => visitExpression(node); | |
| 128 T visitPrefix(Prefix node) => visitExpression(node); | |
| 129 T visitPostfix(Postfix node) => visitExpression(node); | |
| 130 T visitAccess(PropertyAccess node) => visitExpression(node); | |
| 131 | |
| 132 T visitVariableUse(VariableUse node) => visitVariableReference(node); | |
| 133 T visitVariableDeclaration(VariableDeclaration node) | |
| 134 => visitVariableReference(node); | |
| 135 T visitParameter(Parameter node) => visitVariableDeclaration(node); | |
| 136 T visitThis(This node) => visitParameter(node); | |
| 137 | |
| 138 T visitNamedFunction(NamedFunction node) => visitExpression(node); | |
| 139 T visitFun(Fun node) => visitExpression(node); | |
| 140 | |
| 141 T visitLiteral(Literal node) => visitExpression(node); | |
| 142 | |
| 143 T visitLiteralBool(LiteralBool node) => visitLiteral(node); | |
| 144 T visitLiteralString(LiteralString node) => visitLiteral(node); | |
| 145 T visitLiteralNumber(LiteralNumber node) => visitLiteral(node); | |
| 146 T visitLiteralNull(LiteralNull node) => visitLiteral(node); | |
| 147 | |
| 148 T visitArrayInitializer(ArrayInitializer node) => visitExpression(node); | |
| 149 T visitArrayHole(ArrayHole node) => visitExpression(node); | |
| 150 T visitObjectInitializer(ObjectInitializer node) => visitExpression(node); | |
| 151 T visitProperty(Property node) => visitNode(node); | |
| 152 T visitRegExpLiteral(RegExpLiteral node) => visitExpression(node); | |
| 153 | |
| 154 T visitInterpolatedNode(InterpolatedNode node) => visitNode(node); | |
| 155 | |
| 156 T visitInterpolatedExpression(InterpolatedExpression node) | |
| 157 => visitInterpolatedNode(node); | |
| 158 T visitInterpolatedLiteral(InterpolatedLiteral node) | |
| 159 => visitInterpolatedNode(node); | |
| 160 T visitInterpolatedParameter(InterpolatedParameter node) | |
| 161 => visitInterpolatedNode(node); | |
| 162 T visitInterpolatedSelector(InterpolatedSelector node) | |
| 163 => visitInterpolatedNode(node); | |
| 164 T visitInterpolatedStatement(InterpolatedStatement node) | |
| 165 => visitInterpolatedNode(node); | |
| 166 | |
| 167 // Ignore comments by default. | |
| 168 T visitComment(Comment node) => null; | |
| 169 | |
| 170 T visitAwait(Await node) => visitExpression(node); | |
| 171 T visitDartYield(DartYield node) => visitStatement(node); | |
| 172 } | |
| 173 | |
| 174 /// This tag interface has no behaviour but must be implemented by any class | |
| 175 /// that is to be stored on a [Node] as source information. | |
| 176 abstract class JavaScriptNodeSourceInformation {} | |
| 177 | |
| 178 abstract class Node { | |
| 179 JavaScriptNodeSourceInformation get sourceInformation => _sourceInformation; | |
| 180 | |
| 181 JavaScriptNodeSourceInformation _sourceInformation; | |
| 182 | |
| 183 accept(NodeVisitor visitor); | |
| 184 void visitChildren(NodeVisitor visitor); | |
| 185 | |
| 186 // Shallow clone of node. Does not clone positions since the only use of this | |
| 187 // private method is create a copy with a new position. | |
| 188 Node _clone(); | |
| 189 | |
| 190 // Returns a node equivalent to [this], but with new source position and end | |
| 191 // source position. | |
| 192 Node withSourceInformation( | |
| 193 JavaScriptNodeSourceInformation sourceInformation) { | |
| 194 if (sourceInformation == _sourceInformation) { | |
| 195 return this; | |
| 196 } | |
| 197 Node clone = _clone(); | |
| 198 // TODO(sra): Should existing data be 'sticky' if we try to overwrite with | |
| 199 // `null`? | |
| 200 clone._sourceInformation = sourceInformation; | |
| 201 return clone; | |
| 202 } | |
| 203 | |
| 204 VariableUse asVariableUse() => null; | |
| 205 | |
| 206 bool get isCommaOperator => false; | |
| 207 | |
| 208 Statement toStatement() { | |
| 209 throw new UnsupportedError('toStatement'); | |
| 210 } | |
| 211 } | |
| 212 | |
| 213 class Program extends Node { | |
| 214 final List<Statement> body; | |
| 215 Program(this.body); | |
| 216 | |
| 217 accept(NodeVisitor visitor) => visitor.visitProgram(this); | |
| 218 void visitChildren(NodeVisitor visitor) { | |
| 219 for (Statement statement in body) statement.accept(visitor); | |
| 220 } | |
| 221 Program _clone() => new Program(body); | |
| 222 } | |
| 223 | |
| 224 abstract class Statement extends Node { | |
| 225 Statement toStatement() => this; | |
| 226 } | |
| 227 | |
| 228 class Block extends Statement { | |
| 229 final List<Statement> statements; | |
| 230 Block(this.statements); | |
| 231 Block.empty() : this.statements = <Statement>[]; | |
| 232 | |
| 233 accept(NodeVisitor visitor) => visitor.visitBlock(this); | |
| 234 void visitChildren(NodeVisitor visitor) { | |
| 235 for (Statement statement in statements) statement.accept(visitor); | |
| 236 } | |
| 237 Block _clone() => new Block(statements); | |
| 238 } | |
| 239 | |
| 240 class ExpressionStatement extends Statement { | |
| 241 final Expression expression; | |
| 242 ExpressionStatement(this.expression); | |
| 243 | |
| 244 accept(NodeVisitor visitor) => visitor.visitExpressionStatement(this); | |
| 245 void visitChildren(NodeVisitor visitor) { expression.accept(visitor); } | |
| 246 ExpressionStatement _clone() => new ExpressionStatement(expression); | |
| 247 } | |
| 248 | |
| 249 class EmptyStatement extends Statement { | |
| 250 EmptyStatement(); | |
| 251 | |
| 252 accept(NodeVisitor visitor) => visitor.visitEmptyStatement(this); | |
| 253 void visitChildren(NodeVisitor visitor) {} | |
| 254 EmptyStatement _clone() => new EmptyStatement(); | |
| 255 } | |
| 256 | |
| 257 class If extends Statement { | |
| 258 final Expression condition; | |
| 259 final Node then; | |
| 260 final Node otherwise; | |
| 261 | |
| 262 If(this.condition, this.then, this.otherwise); | |
| 263 If.noElse(this.condition, this.then) : this.otherwise = new EmptyStatement(); | |
| 264 | |
| 265 bool get hasElse => otherwise is !EmptyStatement; | |
| 266 | |
| 267 accept(NodeVisitor visitor) => visitor.visitIf(this); | |
| 268 | |
| 269 void visitChildren(NodeVisitor visitor) { | |
| 270 condition.accept(visitor); | |
| 271 then.accept(visitor); | |
| 272 otherwise.accept(visitor); | |
| 273 } | |
| 274 | |
| 275 If _clone() => new If(condition, then, otherwise); | |
| 276 } | |
| 277 | |
| 278 abstract class Loop extends Statement { | |
| 279 final Statement body; | |
| 280 Loop(this.body); | |
| 281 } | |
| 282 | |
| 283 class For extends Loop { | |
| 284 final Expression init; | |
| 285 final Expression condition; | |
| 286 final Expression update; | |
| 287 | |
| 288 For(this.init, this.condition, this.update, Statement body) : super(body); | |
| 289 | |
| 290 accept(NodeVisitor visitor) => visitor.visitFor(this); | |
| 291 | |
| 292 void visitChildren(NodeVisitor visitor) { | |
| 293 if (init != null) init.accept(visitor); | |
| 294 if (condition != null) condition.accept(visitor); | |
| 295 if (update != null) update.accept(visitor); | |
| 296 body.accept(visitor); | |
| 297 } | |
| 298 | |
| 299 For _clone() => new For(init, condition, update, body); | |
| 300 } | |
| 301 | |
| 302 class ForIn extends Loop { | |
| 303 // Note that [VariableDeclarationList] is a subclass of [Expression]. | |
| 304 // Therefore we can type the leftHandSide as [Expression]. | |
| 305 final Expression leftHandSide; | |
| 306 final Expression object; | |
| 307 | |
| 308 ForIn(this.leftHandSide, this.object, Statement body) : super(body); | |
| 309 | |
| 310 accept(NodeVisitor visitor) => visitor.visitForIn(this); | |
| 311 | |
| 312 void visitChildren(NodeVisitor visitor) { | |
| 313 leftHandSide.accept(visitor); | |
| 314 object.accept(visitor); | |
| 315 body.accept(visitor); | |
| 316 } | |
| 317 | |
| 318 ForIn _clone() => new ForIn(leftHandSide, object, body); | |
| 319 } | |
| 320 | |
| 321 class While extends Loop { | |
| 322 final Node condition; | |
| 323 | |
| 324 While(this.condition, Statement body) : super(body); | |
| 325 | |
| 326 accept(NodeVisitor visitor) => visitor.visitWhile(this); | |
| 327 | |
| 328 void visitChildren(NodeVisitor visitor) { | |
| 329 condition.accept(visitor); | |
| 330 body.accept(visitor); | |
| 331 } | |
| 332 | |
| 333 While _clone() => new While(condition, body); | |
| 334 } | |
| 335 | |
| 336 class Do extends Loop { | |
| 337 final Expression condition; | |
| 338 | |
| 339 Do(Statement body, this.condition) : super(body); | |
| 340 | |
| 341 accept(NodeVisitor visitor) => visitor.visitDo(this); | |
| 342 | |
| 343 void visitChildren(NodeVisitor visitor) { | |
| 344 body.accept(visitor); | |
| 345 condition.accept(visitor); | |
| 346 } | |
| 347 | |
| 348 Do _clone() => new Do(body, condition); | |
| 349 } | |
| 350 | |
| 351 class Continue extends Statement { | |
| 352 final String targetLabel; // Can be null. | |
| 353 | |
| 354 Continue(this.targetLabel); | |
| 355 | |
| 356 accept(NodeVisitor visitor) => visitor.visitContinue(this); | |
| 357 void visitChildren(NodeVisitor visitor) {} | |
| 358 | |
| 359 Continue _clone() => new Continue(targetLabel); | |
| 360 } | |
| 361 | |
| 362 class Break extends Statement { | |
| 363 final String targetLabel; // Can be null. | |
| 364 | |
| 365 Break(this.targetLabel); | |
| 366 | |
| 367 accept(NodeVisitor visitor) => visitor.visitBreak(this); | |
| 368 void visitChildren(NodeVisitor visitor) {} | |
| 369 | |
| 370 Break _clone() => new Break(targetLabel); | |
| 371 } | |
| 372 | |
| 373 class Return extends Statement { | |
| 374 final Expression value; // Can be null. | |
| 375 | |
| 376 Return([this.value = null]); | |
| 377 | |
| 378 accept(NodeVisitor visitor) => visitor.visitReturn(this); | |
| 379 | |
| 380 void visitChildren(NodeVisitor visitor) { | |
| 381 if (value != null) value.accept(visitor); | |
| 382 } | |
| 383 | |
| 384 Return _clone() => new Return(value); | |
| 385 } | |
| 386 | |
| 387 class Throw extends Statement { | |
| 388 final Expression expression; | |
| 389 | |
| 390 Throw(this.expression); | |
| 391 | |
| 392 accept(NodeVisitor visitor) => visitor.visitThrow(this); | |
| 393 | |
| 394 void visitChildren(NodeVisitor visitor) { | |
| 395 expression.accept(visitor); | |
| 396 } | |
| 397 | |
| 398 Throw _clone() => new Throw(expression); | |
| 399 } | |
| 400 | |
| 401 class Try extends Statement { | |
| 402 final Block body; | |
| 403 final Catch catchPart; // Can be null if [finallyPart] is non-null. | |
| 404 final Block finallyPart; // Can be null if [catchPart] is non-null. | |
| 405 | |
| 406 Try(this.body, this.catchPart, this.finallyPart) { | |
| 407 assert(catchPart != null || finallyPart != null); | |
| 408 } | |
| 409 | |
| 410 accept(NodeVisitor visitor) => visitor.visitTry(this); | |
| 411 | |
| 412 void visitChildren(NodeVisitor visitor) { | |
| 413 body.accept(visitor); | |
| 414 if (catchPart != null) catchPart.accept(visitor); | |
| 415 if (finallyPart != null) finallyPart.accept(visitor); | |
| 416 } | |
| 417 | |
| 418 Try _clone() => new Try(body, catchPart, finallyPart); | |
| 419 } | |
| 420 | |
| 421 class Catch extends Node { | |
| 422 final VariableDeclaration declaration; | |
| 423 final Block body; | |
| 424 | |
| 425 Catch(this.declaration, this.body); | |
| 426 | |
| 427 accept(NodeVisitor visitor) => visitor.visitCatch(this); | |
| 428 | |
| 429 void visitChildren(NodeVisitor visitor) { | |
| 430 declaration.accept(visitor); | |
| 431 body.accept(visitor); | |
| 432 } | |
| 433 | |
| 434 Catch _clone() => new Catch(declaration, body); | |
| 435 } | |
| 436 | |
| 437 class Switch extends Statement { | |
| 438 final Expression key; | |
| 439 final List<SwitchClause> cases; | |
| 440 | |
| 441 Switch(this.key, this.cases); | |
| 442 | |
| 443 accept(NodeVisitor visitor) => visitor.visitSwitch(this); | |
| 444 | |
| 445 void visitChildren(NodeVisitor visitor) { | |
| 446 key.accept(visitor); | |
| 447 for (SwitchClause clause in cases) clause.accept(visitor); | |
| 448 } | |
| 449 | |
| 450 Switch _clone() => new Switch(key, cases); | |
| 451 } | |
| 452 | |
| 453 abstract class SwitchClause extends Node { | |
| 454 final Block body; | |
| 455 | |
| 456 SwitchClause(this.body); | |
| 457 } | |
| 458 | |
| 459 class Case extends SwitchClause { | |
| 460 final Expression expression; | |
| 461 | |
| 462 Case(this.expression, Block body) : super(body); | |
| 463 | |
| 464 accept(NodeVisitor visitor) => visitor.visitCase(this); | |
| 465 | |
| 466 void visitChildren(NodeVisitor visitor) { | |
| 467 expression.accept(visitor); | |
| 468 body.accept(visitor); | |
| 469 } | |
| 470 | |
| 471 Case _clone() => new Case(expression, body); | |
| 472 } | |
| 473 | |
| 474 class Default extends SwitchClause { | |
| 475 Default(Block body) : super(body); | |
| 476 | |
| 477 accept(NodeVisitor visitor) => visitor.visitDefault(this); | |
| 478 | |
| 479 void visitChildren(NodeVisitor visitor) { | |
| 480 body.accept(visitor); | |
| 481 } | |
| 482 | |
| 483 Default _clone() => new Default(body); | |
| 484 } | |
| 485 | |
| 486 class FunctionDeclaration extends Statement { | |
| 487 final VariableDeclaration name; | |
| 488 final Fun function; | |
| 489 | |
| 490 FunctionDeclaration(this.name, this.function); | |
| 491 | |
| 492 accept(NodeVisitor visitor) => visitor.visitFunctionDeclaration(this); | |
| 493 | |
| 494 void visitChildren(NodeVisitor visitor) { | |
| 495 name.accept(visitor); | |
| 496 function.accept(visitor); | |
| 497 } | |
| 498 | |
| 499 FunctionDeclaration _clone() => new FunctionDeclaration(name, function); | |
| 500 } | |
| 501 | |
| 502 class LabeledStatement extends Statement { | |
| 503 final String label; | |
| 504 final Statement body; | |
| 505 | |
| 506 LabeledStatement(this.label, this.body); | |
| 507 | |
| 508 accept(NodeVisitor visitor) => visitor.visitLabeledStatement(this); | |
| 509 | |
| 510 void visitChildren(NodeVisitor visitor) { | |
| 511 body.accept(visitor); | |
| 512 } | |
| 513 | |
| 514 LabeledStatement _clone() => new LabeledStatement(label, body); | |
| 515 } | |
| 516 | |
| 517 class LiteralStatement extends Statement { | |
| 518 final String code; | |
| 519 | |
| 520 LiteralStatement(this.code); | |
| 521 | |
| 522 accept(NodeVisitor visitor) => visitor.visitLiteralStatement(this); | |
| 523 void visitChildren(NodeVisitor visitor) { } | |
| 524 | |
| 525 LiteralStatement _clone() => new LiteralStatement(code); | |
| 526 } | |
| 527 | |
| 528 // Not a real JavaScript node, but represents the yield statement from a dart | |
| 529 // program translated to JavaScript. | |
| 530 class DartYield extends Statement { | |
| 531 final Expression expression; | |
| 532 | |
| 533 final bool hasStar; | |
| 534 | |
| 535 DartYield(this.expression, this.hasStar); | |
| 536 | |
| 537 accept(NodeVisitor visitor) => visitor.visitDartYield(this); | |
| 538 | |
| 539 void visitChildren(NodeVisitor visitor) { | |
| 540 expression.accept(visitor); | |
| 541 } | |
| 542 | |
| 543 DartYield _clone() => new DartYield(expression, hasStar); | |
| 544 } | |
| 545 | |
| 546 abstract class Expression extends Node { | |
| 547 int get precedenceLevel; | |
| 548 | |
| 549 Statement toStatement() => new ExpressionStatement(this); | |
| 550 } | |
| 551 | |
| 552 class LiteralExpression extends Expression { | |
| 553 final String template; | |
| 554 final List<Expression> inputs; | |
| 555 | |
| 556 LiteralExpression(this.template) : inputs = const []; | |
| 557 LiteralExpression.withData(this.template, this.inputs); | |
| 558 | |
| 559 accept(NodeVisitor visitor) => visitor.visitLiteralExpression(this); | |
| 560 | |
| 561 void visitChildren(NodeVisitor visitor) { | |
| 562 if (inputs != null) { | |
| 563 for (Expression expr in inputs) expr.accept(visitor); | |
| 564 } | |
| 565 } | |
| 566 | |
| 567 LiteralExpression _clone() => | |
| 568 new LiteralExpression.withData(template, inputs); | |
| 569 | |
| 570 // Code that uses JS must take care of operator precedences, and | |
| 571 // put parenthesis if needed. | |
| 572 int get precedenceLevel => PRIMARY; | |
| 573 } | |
| 574 | |
| 575 /** | |
| 576 * [VariableDeclarationList] is a subclass of [Expression] to simplify the | |
| 577 * AST. | |
| 578 */ | |
| 579 class VariableDeclarationList extends Expression { | |
| 580 final List<VariableInitialization> declarations; | |
| 581 | |
| 582 VariableDeclarationList(this.declarations); | |
| 583 | |
| 584 accept(NodeVisitor visitor) => visitor.visitVariableDeclarationList(this); | |
| 585 | |
| 586 void visitChildren(NodeVisitor visitor) { | |
| 587 for (VariableInitialization declaration in declarations) { | |
| 588 declaration.accept(visitor); | |
| 589 } | |
| 590 } | |
| 591 | |
| 592 VariableDeclarationList _clone() => new VariableDeclarationList(declarations); | |
| 593 | |
| 594 int get precedenceLevel => EXPRESSION; | |
| 595 } | |
| 596 | |
| 597 class Assignment extends Expression { | |
| 598 final Expression leftHandSide; | |
| 599 final String op; // Null, if the assignment is not compound. | |
| 600 final Expression value; // May be null, for [VariableInitialization]s. | |
| 601 | |
| 602 Assignment(leftHandSide, value) | |
| 603 : this.compound(leftHandSide, null, value); | |
| 604 Assignment.compound(this.leftHandSide, this.op, this.value); | |
| 605 | |
| 606 int get precedenceLevel => ASSIGNMENT; | |
| 607 | |
| 608 bool get isCompound => op != null; | |
| 609 | |
| 610 accept(NodeVisitor visitor) => visitor.visitAssignment(this); | |
| 611 | |
| 612 void visitChildren(NodeVisitor visitor) { | |
| 613 leftHandSide.accept(visitor); | |
| 614 if (value != null) value.accept(visitor); | |
| 615 } | |
| 616 | |
| 617 Assignment _clone() => | |
| 618 new Assignment.compound(leftHandSide, op, value); | |
| 619 } | |
| 620 | |
| 621 class VariableInitialization extends Assignment { | |
| 622 /** [value] may be null. */ | |
| 623 VariableInitialization(VariableDeclaration declaration, Expression value) | |
| 624 : super(declaration, value); | |
| 625 | |
| 626 VariableDeclaration get declaration => leftHandSide; | |
| 627 | |
| 628 accept(NodeVisitor visitor) => visitor.visitVariableInitialization(this); | |
| 629 | |
| 630 VariableInitialization _clone() => | |
| 631 new VariableInitialization(declaration, value); | |
| 632 } | |
| 633 | |
| 634 class Conditional extends Expression { | |
| 635 final Expression condition; | |
| 636 final Expression then; | |
| 637 final Expression otherwise; | |
| 638 | |
| 639 Conditional(this.condition, this.then, this.otherwise); | |
| 640 | |
| 641 accept(NodeVisitor visitor) => visitor.visitConditional(this); | |
| 642 | |
| 643 void visitChildren(NodeVisitor visitor) { | |
| 644 condition.accept(visitor); | |
| 645 then.accept(visitor); | |
| 646 otherwise.accept(visitor); | |
| 647 } | |
| 648 | |
| 649 Conditional _clone() => new Conditional(condition, then, otherwise); | |
| 650 | |
| 651 int get precedenceLevel => ASSIGNMENT; | |
| 652 } | |
| 653 | |
| 654 class Call extends Expression { | |
| 655 Expression target; | |
| 656 List<Expression> arguments; | |
| 657 | |
| 658 Call(this.target, this.arguments); | |
| 659 | |
| 660 accept(NodeVisitor visitor) => visitor.visitCall(this); | |
| 661 | |
| 662 void visitChildren(NodeVisitor visitor) { | |
| 663 target.accept(visitor); | |
| 664 for (Expression arg in arguments) arg.accept(visitor); | |
| 665 } | |
| 666 | |
| 667 Call _clone() => new Call(target, arguments); | |
| 668 | |
| 669 int get precedenceLevel => CALL; | |
| 670 } | |
| 671 | |
| 672 class New extends Call { | |
| 673 New(Expression cls, List<Expression> arguments) : super(cls, arguments); | |
| 674 | |
| 675 accept(NodeVisitor visitor) => visitor.visitNew(this); | |
| 676 | |
| 677 New _clone() => new New(target, arguments); | |
| 678 } | |
| 679 | |
| 680 class Binary extends Expression { | |
| 681 final String op; | |
| 682 final Expression left; | |
| 683 final Expression right; | |
| 684 | |
| 685 Binary(this.op, this.left, this.right); | |
| 686 | |
| 687 accept(NodeVisitor visitor) => visitor.visitBinary(this); | |
| 688 | |
| 689 Binary _clone() => new Binary(op, left, right); | |
| 690 | |
| 691 void visitChildren(NodeVisitor visitor) { | |
| 692 left.accept(visitor); | |
| 693 right.accept(visitor); | |
| 694 } | |
| 695 | |
| 696 bool get isCommaOperator => op == ','; | |
| 697 | |
| 698 int get precedenceLevel { | |
| 699 // TODO(floitsch): switch to constant map. | |
| 700 switch (op) { | |
| 701 case "*": | |
| 702 case "/": | |
| 703 case "%": | |
| 704 return MULTIPLICATIVE; | |
| 705 case "+": | |
| 706 case "-": | |
| 707 return ADDITIVE; | |
| 708 case "<<": | |
| 709 case ">>": | |
| 710 case ">>>": | |
| 711 return SHIFT; | |
| 712 case "<": | |
| 713 case ">": | |
| 714 case "<=": | |
| 715 case ">=": | |
| 716 case "instanceof": | |
| 717 case "in": | |
| 718 return RELATIONAL; | |
| 719 case "==": | |
| 720 case "===": | |
| 721 case "!=": | |
| 722 case "!==": | |
| 723 return EQUALITY; | |
| 724 case "&": | |
| 725 return BIT_AND; | |
| 726 case "^": | |
| 727 return BIT_XOR; | |
| 728 case "|": | |
| 729 return BIT_OR; | |
| 730 case "&&": | |
| 731 return LOGICAL_AND; | |
| 732 case "||": | |
| 733 return LOGICAL_OR; | |
| 734 case ',': | |
| 735 return EXPRESSION; | |
| 736 default: | |
| 737 throw "Internal Error: Unhandled binary operator: $op"; | |
| 738 } | |
| 739 } | |
| 740 } | |
| 741 | |
| 742 class Prefix extends Expression { | |
| 743 final String op; | |
| 744 final Expression argument; | |
| 745 | |
| 746 Prefix(this.op, this.argument); | |
| 747 | |
| 748 accept(NodeVisitor visitor) => visitor.visitPrefix(this); | |
| 749 | |
| 750 Prefix _clone() => new Prefix(op, argument); | |
| 751 | |
| 752 void visitChildren(NodeVisitor visitor) { | |
| 753 argument.accept(visitor); | |
| 754 } | |
| 755 | |
| 756 int get precedenceLevel => UNARY; | |
| 757 } | |
| 758 | |
| 759 class Postfix extends Expression { | |
| 760 final String op; | |
| 761 final Expression argument; | |
| 762 | |
| 763 Postfix(this.op, this.argument); | |
| 764 | |
| 765 accept(NodeVisitor visitor) => visitor.visitPostfix(this); | |
| 766 | |
| 767 Postfix _clone() => new Postfix(op, argument); | |
| 768 | |
| 769 void visitChildren(NodeVisitor visitor) { | |
| 770 argument.accept(visitor); | |
| 771 } | |
| 772 | |
| 773 | |
| 774 int get precedenceLevel => UNARY; | |
| 775 } | |
| 776 | |
| 777 abstract class VariableReference extends Expression { | |
| 778 final String name; | |
| 779 | |
| 780 VariableReference(this.name) { | |
| 781 assert(_identifierRE.hasMatch(name)); | |
| 782 } | |
| 783 static RegExp _identifierRE = new RegExp(r'^[A-Za-z_$][A-Za-z_$0-9]*$'); | |
| 784 | |
| 785 accept(NodeVisitor visitor); | |
| 786 int get precedenceLevel => PRIMARY; | |
| 787 void visitChildren(NodeVisitor visitor) {} | |
| 788 } | |
| 789 | |
| 790 class VariableUse extends VariableReference { | |
| 791 VariableUse(String name) : super(name); | |
| 792 | |
| 793 accept(NodeVisitor visitor) => visitor.visitVariableUse(this); | |
| 794 VariableUse _clone() => new VariableUse(name); | |
| 795 | |
| 796 VariableUse asVariableUse() => this; | |
| 797 | |
| 798 toString() => 'VariableUse($name)'; | |
| 799 } | |
| 800 | |
| 801 class VariableDeclaration extends VariableReference { | |
| 802 final bool allowRename; | |
| 803 VariableDeclaration(String name, {this.allowRename: true}) : super(name); | |
| 804 | |
| 805 accept(NodeVisitor visitor) => visitor.visitVariableDeclaration(this); | |
| 806 VariableDeclaration _clone() => new VariableDeclaration(name); | |
| 807 } | |
| 808 | |
| 809 class Parameter extends VariableDeclaration { | |
| 810 Parameter(String name) : super(name); | |
| 811 | |
| 812 accept(NodeVisitor visitor) => visitor.visitParameter(this); | |
| 813 Parameter _clone() => new Parameter(name); | |
| 814 } | |
| 815 | |
| 816 class This extends Parameter { | |
| 817 This() : super("this"); | |
| 818 | |
| 819 accept(NodeVisitor visitor) => visitor.visitThis(this); | |
| 820 This _clone() => new This(); | |
| 821 } | |
| 822 | |
| 823 class NamedFunction extends Expression { | |
| 824 final VariableDeclaration name; | |
| 825 final Fun function; | |
| 826 | |
| 827 NamedFunction(this.name, this.function); | |
| 828 | |
| 829 accept(NodeVisitor visitor) => visitor.visitNamedFunction(this); | |
| 830 | |
| 831 void visitChildren(NodeVisitor visitor) { | |
| 832 name.accept(visitor); | |
| 833 function.accept(visitor); | |
| 834 } | |
| 835 NamedFunction _clone() => new NamedFunction(name, function); | |
| 836 | |
| 837 int get precedenceLevel => CALL; | |
| 838 } | |
| 839 | |
| 840 class Fun extends Expression { | |
| 841 final List<Parameter> params; | |
| 842 final Block body; | |
| 843 final AsyncModifier asyncModifier; | |
| 844 | |
| 845 Fun(this.params, this.body, {this.asyncModifier: const AsyncModifier.sync()}); | |
| 846 | |
| 847 accept(NodeVisitor visitor) => visitor.visitFun(this); | |
| 848 | |
| 849 void visitChildren(NodeVisitor visitor) { | |
| 850 for (Parameter param in params) param.accept(visitor); | |
| 851 body.accept(visitor); | |
| 852 } | |
| 853 | |
| 854 Fun _clone() => new Fun(params, body, asyncModifier: asyncModifier); | |
| 855 | |
| 856 int get precedenceLevel => CALL; | |
| 857 } | |
| 858 | |
| 859 class AsyncModifier { | |
| 860 final bool isAsync; | |
| 861 final bool isYielding; | |
| 862 final String description; | |
| 863 | |
| 864 const AsyncModifier.sync() | |
| 865 : isAsync = false, | |
| 866 isYielding = false, | |
| 867 description = "sync"; | |
| 868 const AsyncModifier.async() | |
| 869 : isAsync = true, | |
| 870 isYielding = false, | |
| 871 description = "async"; | |
| 872 const AsyncModifier.asyncStar() | |
| 873 : isAsync = true, | |
| 874 isYielding = true, | |
| 875 description = "async*"; | |
| 876 const AsyncModifier.syncStar() | |
| 877 : isAsync = false, | |
| 878 isYielding = true, | |
| 879 description = "sync*"; | |
| 880 toString() => description; | |
| 881 } | |
| 882 | |
| 883 class PropertyAccess extends Expression { | |
| 884 final Expression receiver; | |
| 885 final Expression selector; | |
| 886 | |
| 887 PropertyAccess(this.receiver, this.selector); | |
| 888 PropertyAccess.field(this.receiver, String fieldName) | |
| 889 : selector = new LiteralString('"$fieldName"'); | |
| 890 PropertyAccess.indexed(this.receiver, int index) | |
| 891 : selector = new LiteralNumber('$index'); | |
| 892 | |
| 893 accept(NodeVisitor visitor) => visitor.visitAccess(this); | |
| 894 | |
| 895 void visitChildren(NodeVisitor visitor) { | |
| 896 receiver.accept(visitor); | |
| 897 selector.accept(visitor); | |
| 898 } | |
| 899 | |
| 900 PropertyAccess _clone() => new PropertyAccess(receiver, selector); | |
| 901 | |
| 902 int get precedenceLevel => CALL; | |
| 903 } | |
| 904 | |
| 905 abstract class Literal extends Expression { | |
| 906 void visitChildren(NodeVisitor visitor) {} | |
| 907 | |
| 908 int get precedenceLevel => PRIMARY; | |
| 909 } | |
| 910 | |
| 911 class LiteralBool extends Literal { | |
| 912 final bool value; | |
| 913 | |
| 914 LiteralBool(this.value); | |
| 915 | |
| 916 accept(NodeVisitor visitor) => visitor.visitLiteralBool(this); | |
| 917 // [visitChildren] inherited from [Literal]. | |
| 918 LiteralBool _clone() => new LiteralBool(value); | |
| 919 } | |
| 920 | |
| 921 class LiteralNull extends Literal { | |
| 922 LiteralNull(); | |
| 923 | |
| 924 accept(NodeVisitor visitor) => visitor.visitLiteralNull(this); | |
| 925 LiteralNull _clone() => new LiteralNull(); | |
| 926 } | |
| 927 | |
| 928 class LiteralString extends Literal { | |
| 929 final String value; | |
| 930 | |
| 931 /** | |
| 932 * Constructs a LiteralString from a string value. | |
| 933 * | |
| 934 * The constructor does not add the required quotes. If [value] is not | |
| 935 * surrounded by quotes and property escaped, the resulting object is invalid | |
| 936 * as a JS value. | |
| 937 * | |
| 938 * TODO(sra): Introduce variants for known valid strings that don't allocate a | |
| 939 * new string just to add quotes. | |
| 940 */ | |
| 941 LiteralString(this.value); | |
| 942 | |
| 943 accept(NodeVisitor visitor) => visitor.visitLiteralString(this); | |
| 944 LiteralString _clone() => new LiteralString(value); | |
| 945 } | |
| 946 | |
| 947 class LiteralNumber extends Literal { | |
| 948 final String value; // Must be a valid JavaScript number literal. | |
| 949 | |
| 950 LiteralNumber(this.value); | |
| 951 | |
| 952 accept(NodeVisitor visitor) => visitor.visitLiteralNumber(this); | |
| 953 LiteralNumber _clone() => new LiteralNumber(value); | |
| 954 } | |
| 955 | |
| 956 class ArrayInitializer extends Expression { | |
| 957 final List<Expression> elements; | |
| 958 | |
| 959 ArrayInitializer(this.elements); | |
| 960 | |
| 961 accept(NodeVisitor visitor) => visitor.visitArrayInitializer(this); | |
| 962 | |
| 963 void visitChildren(NodeVisitor visitor) { | |
| 964 for (Expression element in elements) element.accept(visitor); | |
| 965 } | |
| 966 | |
| 967 ArrayInitializer _clone() => new ArrayInitializer(elements); | |
| 968 | |
| 969 int get precedenceLevel => PRIMARY; | |
| 970 } | |
| 971 | |
| 972 /** | |
| 973 * An empty place in an [ArrayInitializer]. | |
| 974 * For example the list [1, , , 2] would contain two holes. | |
| 975 */ | |
| 976 class ArrayHole extends Expression { | |
| 977 accept(NodeVisitor visitor) => visitor.visitArrayHole(this); | |
| 978 | |
| 979 void visitChildren(NodeVisitor visitor) {} | |
| 980 | |
| 981 ArrayHole _clone() => new ArrayHole(); | |
| 982 | |
| 983 int get precedenceLevel => PRIMARY; | |
| 984 } | |
| 985 | |
| 986 class ObjectInitializer extends Expression { | |
| 987 final List<Property> properties; | |
| 988 final bool isOneLiner; | |
| 989 | |
| 990 /** | |
| 991 * Constructs a new object-initializer containing the given [properties]. | |
| 992 * | |
| 993 * [isOneLiner] describes the behaviour when pretty-printing (non-minified). | |
| 994 * If true print all properties on the same line. | |
| 995 * If false print each property on a seperate line. | |
| 996 */ | |
| 997 ObjectInitializer(this.properties, {this.isOneLiner: true}); | |
| 998 | |
| 999 accept(NodeVisitor visitor) => visitor.visitObjectInitializer(this); | |
| 1000 | |
| 1001 void visitChildren(NodeVisitor visitor) { | |
| 1002 for (Property init in properties) init.accept(visitor); | |
| 1003 } | |
| 1004 | |
| 1005 ObjectInitializer _clone() => | |
| 1006 new ObjectInitializer(properties, isOneLiner: isOneLiner); | |
| 1007 | |
| 1008 int get precedenceLevel => PRIMARY; | |
| 1009 } | |
| 1010 | |
| 1011 class Property extends Node { | |
| 1012 final Literal name; | |
| 1013 final Expression value; | |
| 1014 | |
| 1015 Property(this.name, this.value); | |
| 1016 | |
| 1017 accept(NodeVisitor visitor) => visitor.visitProperty(this); | |
| 1018 | |
| 1019 void visitChildren(NodeVisitor visitor) { | |
| 1020 name.accept(visitor); | |
| 1021 value.accept(visitor); | |
| 1022 } | |
| 1023 | |
| 1024 Property _clone() => new Property(name, value); | |
| 1025 } | |
| 1026 | |
| 1027 /// Tag class for all interpolated positions. | |
| 1028 abstract class InterpolatedNode implements Node { | |
| 1029 get nameOrPosition; | |
| 1030 | |
| 1031 bool get isNamed => nameOrPosition is String; | |
| 1032 bool get isPositional => nameOrPosition is int; | |
| 1033 } | |
| 1034 | |
| 1035 class InterpolatedExpression extends Expression with InterpolatedNode { | |
| 1036 final nameOrPosition; | |
| 1037 | |
| 1038 InterpolatedExpression(this.nameOrPosition); | |
| 1039 | |
| 1040 accept(NodeVisitor visitor) => visitor.visitInterpolatedExpression(this); | |
| 1041 void visitChildren(NodeVisitor visitor) {} | |
| 1042 InterpolatedExpression _clone() => | |
| 1043 new InterpolatedExpression(nameOrPosition); | |
| 1044 | |
| 1045 int get precedenceLevel => PRIMARY; | |
| 1046 } | |
| 1047 | |
| 1048 class InterpolatedLiteral extends Literal with InterpolatedNode { | |
| 1049 final nameOrPosition; | |
| 1050 | |
| 1051 InterpolatedLiteral(this.nameOrPosition); | |
| 1052 | |
| 1053 accept(NodeVisitor visitor) => visitor.visitInterpolatedLiteral(this); | |
| 1054 void visitChildren(NodeVisitor visitor) {} | |
| 1055 InterpolatedLiteral _clone() => new InterpolatedLiteral(nameOrPosition); | |
| 1056 } | |
| 1057 | |
| 1058 class InterpolatedParameter extends Expression with InterpolatedNode | |
| 1059 implements Parameter { | |
| 1060 final nameOrPosition; | |
| 1061 | |
| 1062 String get name { throw "InterpolatedParameter.name must not be invoked"; } | |
| 1063 bool get allowRename => false; | |
| 1064 | |
| 1065 InterpolatedParameter(this.nameOrPosition); | |
| 1066 | |
| 1067 accept(NodeVisitor visitor) => visitor.visitInterpolatedParameter(this); | |
| 1068 void visitChildren(NodeVisitor visitor) {} | |
| 1069 InterpolatedParameter _clone() => new InterpolatedParameter(nameOrPosition); | |
| 1070 | |
| 1071 int get precedenceLevel => PRIMARY; | |
| 1072 } | |
| 1073 | |
| 1074 class InterpolatedSelector extends Expression with InterpolatedNode { | |
| 1075 final nameOrPosition; | |
| 1076 | |
| 1077 InterpolatedSelector(this.nameOrPosition); | |
| 1078 | |
| 1079 accept(NodeVisitor visitor) => visitor.visitInterpolatedSelector(this); | |
| 1080 void visitChildren(NodeVisitor visitor) {} | |
| 1081 InterpolatedSelector _clone() => new InterpolatedSelector(nameOrPosition); | |
| 1082 | |
| 1083 int get precedenceLevel => PRIMARY; | |
| 1084 } | |
| 1085 | |
| 1086 class InterpolatedStatement extends Statement with InterpolatedNode { | |
| 1087 final nameOrPosition; | |
| 1088 | |
| 1089 InterpolatedStatement(this.nameOrPosition); | |
| 1090 | |
| 1091 accept(NodeVisitor visitor) => visitor.visitInterpolatedStatement(this); | |
| 1092 void visitChildren(NodeVisitor visitor) {} | |
| 1093 InterpolatedStatement _clone() => new InterpolatedStatement(nameOrPosition); | |
| 1094 } | |
| 1095 | |
| 1096 /** | |
| 1097 * [RegExpLiteral]s, despite being called "Literal", do not inherit from | |
| 1098 * [Literal]. Indeed, regular expressions in JavaScript have a side-effect and | |
| 1099 * are thus not in the same category as numbers or strings. | |
| 1100 */ | |
| 1101 class RegExpLiteral extends Expression { | |
| 1102 /** Contains the pattern and the flags.*/ | |
| 1103 final String pattern; | |
| 1104 | |
| 1105 RegExpLiteral(this.pattern); | |
| 1106 | |
| 1107 accept(NodeVisitor visitor) => visitor.visitRegExpLiteral(this); | |
| 1108 void visitChildren(NodeVisitor visitor) {} | |
| 1109 RegExpLiteral _clone() => new RegExpLiteral(pattern); | |
| 1110 | |
| 1111 int get precedenceLevel => PRIMARY; | |
| 1112 } | |
| 1113 | |
| 1114 /** | |
| 1115 * An asynchronous await. | |
| 1116 * | |
| 1117 * Not part of JavaScript. We desugar this expression before outputting. | |
| 1118 * Should only occur in a [Fun] with `asyncModifier` async or asyncStar. | |
| 1119 */ | |
| 1120 class Await extends Expression { | |
| 1121 /** The awaited expression. */ | |
| 1122 final Expression expression; | |
| 1123 | |
| 1124 Await(this.expression); | |
| 1125 | |
| 1126 int get precedenceLevel => UNARY; | |
| 1127 accept(NodeVisitor visitor) => visitor.visitAwait(this); | |
| 1128 void visitChildren(NodeVisitor visitor) => expression.accept(visitor); | |
| 1129 Await _clone() => new Await(expression); | |
| 1130 | |
| 1131 } | |
| 1132 | |
| 1133 /** | |
| 1134 * A comment. | |
| 1135 * | |
| 1136 * Extends [Statement] so we can add comments before statements in | |
| 1137 * [Block] and [Program]. | |
| 1138 */ | |
| 1139 class Comment extends Statement { | |
| 1140 final String comment; | |
| 1141 | |
| 1142 Comment(this.comment); | |
| 1143 | |
| 1144 accept(NodeVisitor visitor) => visitor.visitComment(this); | |
| 1145 Comment _clone() => new Comment(comment); | |
| 1146 | |
| 1147 void visitChildren(NodeVisitor visitor) {} | |
| 1148 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 931953002:
Move js_ast library to its own package under pkg (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart