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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; | |
| 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 | |
| 31 T visitBlob(Blob node); | |
| 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 visitArrayElement(ArrayElement node); | |
| 59 T visitObjectInitializer(ObjectInitializer node); | |
| 60 T visitProperty(Property node); | |
| 61 T visitRegExpLiteral(RegExpLiteral node); | |
| 62 | |
| 63 T visitComment(Comment node); | |
| 64 | |
| 65 T visitInterpolatedExpression(InterpolatedExpression node); | |
| 66 T visitInterpolatedLiteral(InterpolatedLiteral node); | |
| 67 T visitInterpolatedParameter(InterpolatedParameter node); | |
| 68 T visitInterpolatedSelector(InterpolatedSelector node); | |
| 69 T visitInterpolatedStatement(InterpolatedStatement node); | |
| 70 } | |
| 71 | |
| 72 class BaseVisitor<T> implements NodeVisitor<T> { | |
| 73 T visitNode(Node node) { | |
| 74 node.visitChildren(this); | |
| 75 return null; | |
| 76 } | |
| 77 | |
| 78 T visitProgram(Program node) => visitNode(node); | |
| 79 | |
| 80 T visitStatement(Statement node) => visitNode(node); | |
| 81 T visitLoop(Loop node) => visitStatement(node); | |
| 82 T visitJump(Statement node) => visitStatement(node); | |
| 83 | |
| 84 T visitBlock(Block node) => visitStatement(node); | |
| 85 T visitExpressionStatement(ExpressionStatement node) | |
| 86 => visitStatement(node); | |
| 87 T visitEmptyStatement(EmptyStatement node) => visitStatement(node); | |
| 88 T visitIf(If node) => visitStatement(node); | |
| 89 T visitFor(For node) => visitLoop(node); | |
| 90 T visitForIn(ForIn node) => visitLoop(node); | |
| 91 T visitWhile(While node) => visitLoop(node); | |
| 92 T visitDo(Do node) => visitLoop(node); | |
| 93 T visitContinue(Continue node) => visitJump(node); | |
| 94 T visitBreak(Break node) => visitJump(node); | |
| 95 T visitReturn(Return node) => visitJump(node); | |
| 96 T visitThrow(Throw node) => visitJump(node); | |
| 97 T visitTry(Try node) => visitStatement(node); | |
| 98 T visitSwitch(Switch node) => visitStatement(node); | |
| 99 T visitFunctionDeclaration(FunctionDeclaration node) | |
| 100 => visitStatement(node); | |
| 101 T visitLabeledStatement(LabeledStatement node) => visitStatement(node); | |
| 102 T visitLiteralStatement(LiteralStatement node) => visitStatement(node); | |
| 103 | |
| 104 T visitCatch(Catch node) => visitNode(node); | |
| 105 T visitCase(Case node) => visitNode(node); | |
| 106 T visitDefault(Default node) => visitNode(node); | |
| 107 | |
| 108 T visitExpression(Expression node) => visitNode(node); | |
| 109 T visitBlob(Blob node) => visitExpression(node); | |
| 110 T visitVariableReference(VariableReference node) => visitExpression(node); | |
| 111 | |
| 112 T visitLiteralExpression(LiteralExpression node) => visitExpression(node); | |
| 113 T visitVariableDeclarationList(VariableDeclarationList node) | |
| 114 => visitExpression(node); | |
| 115 T visitAssignment(Assignment node) => visitExpression(node); | |
| 116 T visitVariableInitialization(VariableInitialization node) { | |
| 117 if (node.value != null) { | |
| 118 return visitAssignment(node); | |
| 119 } else { | |
| 120 return visitExpression(node); | |
| 121 } | |
| 122 } | |
| 123 T visitConditional(Conditional node) => visitExpression(node); | |
| 124 T visitNew(New node) => visitExpression(node); | |
| 125 T visitCall(Call node) => visitExpression(node); | |
| 126 T visitBinary(Binary node) => visitExpression(node); | |
| 127 T visitPrefix(Prefix node) => visitExpression(node); | |
| 128 T visitPostfix(Postfix node) => visitExpression(node); | |
| 129 T visitAccess(PropertyAccess node) => visitExpression(node); | |
| 130 | |
| 131 T visitVariableUse(VariableUse node) => visitVariableReference(node); | |
| 132 T visitVariableDeclaration(VariableDeclaration node) | |
| 133 => visitVariableReference(node); | |
| 134 T visitParameter(Parameter node) => visitVariableDeclaration(node); | |
| 135 T visitThis(This node) => visitParameter(node); | |
| 136 | |
| 137 T visitNamedFunction(NamedFunction node) => visitExpression(node); | |
| 138 T visitFun(Fun node) => visitExpression(node); | |
| 139 | |
| 140 T visitLiteral(Literal node) => visitExpression(node); | |
| 141 | |
| 142 T visitLiteralBool(LiteralBool node) => visitLiteral(node); | |
| 143 T visitLiteralString(LiteralString node) => visitLiteral(node); | |
| 144 T visitLiteralNumber(LiteralNumber node) => visitLiteral(node); | |
| 145 T visitLiteralNull(LiteralNull node) => visitLiteral(node); | |
| 146 | |
| 147 T visitArrayInitializer(ArrayInitializer node) => visitExpression(node); | |
| 148 T visitArrayElement(ArrayElement node) => visitNode(node); | |
| 149 T visitObjectInitializer(ObjectInitializer node) => visitExpression(node); | |
| 150 T visitProperty(Property node) => visitNode(node); | |
| 151 T visitRegExpLiteral(RegExpLiteral node) => visitExpression(node); | |
| 152 | |
| 153 T visitInterpolatedNode(InterpolatedNode node) => visitNode(node); | |
| 154 | |
| 155 T visitInterpolatedExpression(InterpolatedExpression node) | |
| 156 => visitInterpolatedNode(node); | |
| 157 T visitInterpolatedLiteral(InterpolatedLiteral node) | |
| 158 => visitInterpolatedNode(node); | |
| 159 T visitInterpolatedParameter(InterpolatedParameter node) | |
| 160 => visitInterpolatedNode(node); | |
| 161 T visitInterpolatedSelector(InterpolatedSelector node) | |
| 162 => visitInterpolatedNode(node); | |
| 163 T visitInterpolatedStatement(InterpolatedStatement node) | |
| 164 => visitInterpolatedNode(node); | |
| 165 | |
| 166 // Ignore comments by default. | |
| 167 T visitComment(Comment node) => null; | |
| 168 } | |
| 169 | |
| 170 abstract class Node { | |
| 171 get sourcePosition => _sourcePosition; | |
| 172 get endSourcePosition => _endSourcePosition; | |
| 173 | |
| 174 var _sourcePosition; | |
| 175 var _endSourcePosition; | |
| 176 | |
| 177 accept(NodeVisitor visitor); | |
| 178 void visitChildren(NodeVisitor visitor); | |
| 179 | |
| 180 // Shallow clone of node. Does not clone positions since the only use of this | |
| 181 // private method is create a copy with a new position. | |
| 182 Node _clone(); | |
| 183 | |
| 184 // Returns a node equivalent to [this], but with new source position and end | |
| 185 // source position. | |
| 186 Node withPosition(var sourcePosition, var endSourcePosition) { | |
| 187 if (sourcePosition == _sourcePosition && | |
| 188 endSourcePosition == _endSourcePosition) { | |
| 189 return this; | |
| 190 } | |
| 191 Node clone = _clone(); | |
| 192 // TODO(sra): Should existing data be 'sticky' if we try to overwrite with | |
| 193 // `null`? | |
| 194 clone._sourcePosition = sourcePosition; | |
| 195 clone._endSourcePosition = endSourcePosition; | |
| 196 return clone; | |
| 197 } | |
| 198 | |
| 199 // Returns a node equivalent to [this], but with new [this.sourcePositions], | |
| 200 // keeping the existing [endPosition] | |
| 201 Node withLocation(var sourcePosition) => | |
| 202 withPosition(sourcePosition, this.endSourcePosition); | |
| 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 Statement withPosition(var sourcePosition, var endSourcePosition) => | |
| 228 super.withPosition(sourcePosition, endSourcePosition); | |
| 229 } | |
| 230 | |
| 231 class Block extends Statement { | |
| 232 final List<Statement> statements; | |
| 233 Block(this.statements); | |
| 234 Block.empty() : this.statements = <Statement>[]; | |
| 235 | |
| 236 accept(NodeVisitor visitor) => visitor.visitBlock(this); | |
| 237 void visitChildren(NodeVisitor visitor) { | |
| 238 for (Statement statement in statements) statement.accept(visitor); | |
| 239 } | |
| 240 Block _clone() => new Block(statements); | |
| 241 } | |
| 242 | |
| 243 class ExpressionStatement extends Statement { | |
| 244 final Expression expression; | |
| 245 ExpressionStatement(this.expression); | |
| 246 | |
| 247 accept(NodeVisitor visitor) => visitor.visitExpressionStatement(this); | |
| 248 void visitChildren(NodeVisitor visitor) { expression.accept(visitor); } | |
| 249 ExpressionStatement _clone() => new ExpressionStatement(expression); | |
| 250 } | |
| 251 | |
| 252 class EmptyStatement extends Statement { | |
| 253 EmptyStatement(); | |
| 254 | |
| 255 accept(NodeVisitor visitor) => visitor.visitEmptyStatement(this); | |
| 256 void visitChildren(NodeVisitor visitor) {} | |
| 257 EmptyStatement _clone() => new EmptyStatement(); | |
| 258 } | |
| 259 | |
| 260 class If extends Statement { | |
| 261 final Expression condition; | |
| 262 final Node then; | |
| 263 final Node otherwise; | |
| 264 | |
| 265 If(this.condition, this.then, this.otherwise); | |
| 266 If.noElse(this.condition, this.then) : this.otherwise = new EmptyStatement(); | |
| 267 | |
| 268 bool get hasElse => otherwise is !EmptyStatement; | |
| 269 | |
| 270 accept(NodeVisitor visitor) => visitor.visitIf(this); | |
| 271 | |
| 272 void visitChildren(NodeVisitor visitor) { | |
| 273 condition.accept(visitor); | |
| 274 then.accept(visitor); | |
| 275 otherwise.accept(visitor); | |
| 276 } | |
| 277 | |
| 278 If _clone() => new If(condition, then, otherwise); | |
| 279 } | |
| 280 | |
| 281 abstract class Loop extends Statement { | |
| 282 final Statement body; | |
| 283 Loop(this.body); | |
| 284 } | |
| 285 | |
| 286 class For extends Loop { | |
| 287 final Expression init; | |
| 288 final Expression condition; | |
| 289 final Expression update; | |
| 290 | |
| 291 For(this.init, this.condition, this.update, Statement body) : super(body); | |
| 292 | |
| 293 accept(NodeVisitor visitor) => visitor.visitFor(this); | |
| 294 | |
| 295 void visitChildren(NodeVisitor visitor) { | |
| 296 if (init != null) init.accept(visitor); | |
| 297 if (condition != null) condition.accept(visitor); | |
| 298 if (update != null) update.accept(visitor); | |
| 299 body.accept(visitor); | |
| 300 } | |
| 301 | |
| 302 For _clone() => new For(init, condition, update, body); | |
| 303 } | |
| 304 | |
| 305 class ForIn extends Loop { | |
| 306 // Note that [VariableDeclarationList] is a subclass of [Expression]. | |
| 307 // Therefore we can type the leftHandSide as [Expression]. | |
| 308 final Expression leftHandSide; | |
| 309 final Expression object; | |
| 310 | |
| 311 ForIn(this.leftHandSide, this.object, Statement body) : super(body); | |
| 312 | |
| 313 accept(NodeVisitor visitor) => visitor.visitForIn(this); | |
| 314 | |
| 315 void visitChildren(NodeVisitor visitor) { | |
| 316 leftHandSide.accept(visitor); | |
| 317 object.accept(visitor); | |
| 318 body.accept(visitor); | |
| 319 } | |
| 320 | |
| 321 ForIn _clone() => new ForIn(leftHandSide, object, body); | |
| 322 } | |
| 323 | |
| 324 class While extends Loop { | |
| 325 final Node condition; | |
| 326 | |
| 327 While(this.condition, Statement body) : super(body); | |
| 328 | |
| 329 accept(NodeVisitor visitor) => visitor.visitWhile(this); | |
| 330 | |
| 331 void visitChildren(NodeVisitor visitor) { | |
| 332 condition.accept(visitor); | |
| 333 body.accept(visitor); | |
| 334 } | |
| 335 | |
| 336 While _clone() => new While(condition, body); | |
| 337 } | |
| 338 | |
| 339 class Do extends Loop { | |
| 340 final Expression condition; | |
| 341 | |
| 342 Do(Statement body, this.condition) : super(body); | |
| 343 | |
| 344 accept(NodeVisitor visitor) => visitor.visitDo(this); | |
| 345 | |
| 346 void visitChildren(NodeVisitor visitor) { | |
| 347 body.accept(visitor); | |
| 348 condition.accept(visitor); | |
| 349 } | |
| 350 | |
| 351 Do _clone() => new Do(body, condition); | |
| 352 } | |
| 353 | |
| 354 class Continue extends Statement { | |
| 355 final String targetLabel; // Can be null. | |
| 356 | |
| 357 Continue(this.targetLabel); | |
| 358 | |
| 359 accept(NodeVisitor visitor) => visitor.visitContinue(this); | |
| 360 void visitChildren(NodeVisitor visitor) {} | |
| 361 | |
| 362 Continue _clone() => new Continue(targetLabel); | |
| 363 } | |
| 364 | |
| 365 class Break extends Statement { | |
| 366 final String targetLabel; // Can be null. | |
| 367 | |
| 368 Break(this.targetLabel); | |
| 369 | |
| 370 accept(NodeVisitor visitor) => visitor.visitBreak(this); | |
| 371 void visitChildren(NodeVisitor visitor) {} | |
| 372 | |
| 373 Break _clone() => new Break(targetLabel); | |
| 374 } | |
| 375 | |
| 376 class Return extends Statement { | |
| 377 final Expression value; // Can be null. | |
| 378 | |
| 379 Return([this.value = null]); | |
| 380 | |
| 381 accept(NodeVisitor visitor) => visitor.visitReturn(this); | |
| 382 | |
| 383 void visitChildren(NodeVisitor visitor) { | |
| 384 if (value != null) value.accept(visitor); | |
| 385 } | |
| 386 | |
| 387 Return _clone() => new Return(value); | |
| 388 } | |
| 389 | |
| 390 class Throw extends Statement { | |
| 391 final Expression expression; | |
| 392 | |
| 393 Throw(this.expression); | |
| 394 | |
| 395 accept(NodeVisitor visitor) => visitor.visitThrow(this); | |
| 396 | |
| 397 void visitChildren(NodeVisitor visitor) { | |
| 398 expression.accept(visitor); | |
| 399 } | |
| 400 | |
| 401 Throw _clone() => new Throw(expression); | |
| 402 } | |
| 403 | |
| 404 class Try extends Statement { | |
| 405 final Block body; | |
| 406 final Catch catchPart; // Can be null if [finallyPart] is non-null. | |
| 407 final Block finallyPart; // Can be null if [catchPart] is non-null. | |
| 408 | |
| 409 Try(this.body, this.catchPart, this.finallyPart) { | |
| 410 assert(catchPart != null || finallyPart != null); | |
| 411 } | |
| 412 | |
| 413 accept(NodeVisitor visitor) => visitor.visitTry(this); | |
| 414 | |
| 415 void visitChildren(NodeVisitor visitor) { | |
| 416 body.accept(visitor); | |
| 417 if (catchPart != null) catchPart.accept(visitor); | |
| 418 if (finallyPart != null) finallyPart.accept(visitor); | |
| 419 } | |
| 420 | |
| 421 Try _clone() => new Try(body, catchPart, finallyPart); | |
| 422 } | |
| 423 | |
| 424 class Catch extends Node { | |
| 425 final VariableDeclaration declaration; | |
| 426 final Block body; | |
| 427 | |
| 428 Catch(this.declaration, this.body); | |
| 429 | |
| 430 accept(NodeVisitor visitor) => visitor.visitCatch(this); | |
| 431 | |
| 432 void visitChildren(NodeVisitor visitor) { | |
| 433 declaration.accept(visitor); | |
| 434 body.accept(visitor); | |
| 435 } | |
| 436 | |
| 437 Catch _clone() => new Catch(declaration, body); | |
| 438 } | |
| 439 | |
| 440 class Switch extends Statement { | |
| 441 final Expression key; | |
| 442 final List<SwitchClause> cases; | |
| 443 | |
| 444 Switch(this.key, this.cases); | |
| 445 | |
| 446 accept(NodeVisitor visitor) => visitor.visitSwitch(this); | |
| 447 | |
| 448 void visitChildren(NodeVisitor visitor) { | |
| 449 key.accept(visitor); | |
| 450 for (SwitchClause clause in cases) clause.accept(visitor); | |
| 451 } | |
| 452 | |
| 453 Switch _clone() => new Switch(key, cases); | |
| 454 } | |
| 455 | |
| 456 abstract class SwitchClause extends Node { | |
| 457 final Block body; | |
| 458 | |
| 459 SwitchClause(this.body); | |
| 460 } | |
| 461 | |
| 462 class Case extends SwitchClause { | |
| 463 final Expression expression; | |
| 464 | |
| 465 Case(this.expression, Block body) : super(body); | |
| 466 | |
| 467 accept(NodeVisitor visitor) => visitor.visitCase(this); | |
| 468 | |
| 469 void visitChildren(NodeVisitor visitor) { | |
| 470 expression.accept(visitor); | |
| 471 body.accept(visitor); | |
| 472 } | |
| 473 | |
| 474 Case _clone() => new Case(expression, body); | |
| 475 } | |
| 476 | |
| 477 class Default extends SwitchClause { | |
| 478 Default(Block body) : super(body); | |
| 479 | |
| 480 accept(NodeVisitor visitor) => visitor.visitDefault(this); | |
| 481 | |
| 482 void visitChildren(NodeVisitor visitor) { | |
| 483 body.accept(visitor); | |
| 484 } | |
| 485 | |
| 486 Default _clone() => new Default(body); | |
| 487 } | |
| 488 | |
| 489 class FunctionDeclaration extends Statement { | |
| 490 final VariableDeclaration name; | |
| 491 final Fun function; | |
| 492 | |
| 493 FunctionDeclaration(this.name, this.function); | |
| 494 | |
| 495 accept(NodeVisitor visitor) => visitor.visitFunctionDeclaration(this); | |
| 496 | |
| 497 void visitChildren(NodeVisitor visitor) { | |
| 498 name.accept(visitor); | |
| 499 function.accept(visitor); | |
| 500 } | |
| 501 | |
| 502 FunctionDeclaration _clone() => new FunctionDeclaration(name, function); | |
| 503 } | |
| 504 | |
| 505 class LabeledStatement extends Statement { | |
| 506 final String label; | |
| 507 final Statement body; | |
| 508 | |
| 509 LabeledStatement(this.label, this.body); | |
| 510 | |
| 511 accept(NodeVisitor visitor) => visitor.visitLabeledStatement(this); | |
| 512 | |
| 513 void visitChildren(NodeVisitor visitor) { | |
| 514 body.accept(visitor); | |
| 515 } | |
| 516 | |
| 517 LabeledStatement _clone() => new LabeledStatement(label, body); | |
| 518 } | |
| 519 | |
| 520 class LiteralStatement extends Statement { | |
| 521 final String code; | |
| 522 | |
| 523 LiteralStatement(this.code); | |
| 524 | |
| 525 accept(NodeVisitor visitor) => visitor.visitLiteralStatement(this); | |
| 526 void visitChildren(NodeVisitor visitor) { } | |
| 527 | |
| 528 LiteralStatement _clone() => new LiteralStatement(code); | |
| 529 } | |
| 530 | |
| 531 abstract class Expression extends Node { | |
| 532 int get precedenceLevel; | |
| 533 | |
| 534 Statement toStatement() => new ExpressionStatement(this); | |
| 535 | |
| 536 Expression withPosition(var sourcePosition, var endSourcePosition) => | |
| 537 super.withPosition(sourcePosition, endSourcePosition); | |
| 538 } | |
| 539 | |
| 540 /// Wrap a CodeBuffer as an expression. | |
| 541 class Blob extends Expression { | |
| 542 // TODO(ahe): This class is an aid to convert everything to ASTs, remove when | |
| 543 // not needed anymore. | |
| 544 | |
| 545 final leg.CodeBuffer buffer; | |
| 546 | |
| 547 Blob(this.buffer); | |
| 548 | |
| 549 accept(NodeVisitor visitor) => visitor.visitBlob(this); | |
| 550 | |
| 551 void visitChildren(NodeVisitor visitor) {} | |
| 552 | |
| 553 Blob _clone() => new Blob(buffer); | |
| 554 | |
| 555 int get precedenceLevel => PRIMARY; | |
| 556 | |
| 557 } | |
| 558 | |
| 559 class LiteralExpression extends Expression { | |
| 560 final String template; | |
| 561 final List<Expression> inputs; | |
| 562 | |
| 563 LiteralExpression(this.template) : inputs = const []; | |
| 564 LiteralExpression.withData(this.template, this.inputs); | |
| 565 | |
| 566 accept(NodeVisitor visitor) => visitor.visitLiteralExpression(this); | |
| 567 | |
| 568 void visitChildren(NodeVisitor visitor) { | |
| 569 if (inputs != null) { | |
| 570 for (Expression expr in inputs) expr.accept(visitor); | |
| 571 } | |
| 572 } | |
| 573 | |
| 574 LiteralExpression _clone() => | |
| 575 new LiteralExpression.withData(template, inputs); | |
| 576 | |
| 577 // Code that uses JS must take care of operator precedences, and | |
| 578 // put parenthesis if needed. | |
| 579 int get precedenceLevel => PRIMARY; | |
| 580 } | |
| 581 | |
| 582 /** | |
| 583 * [VariableDeclarationList] is a subclass of [Expression] to simplify the | |
| 584 * AST. | |
| 585 */ | |
| 586 class VariableDeclarationList extends Expression { | |
| 587 final List<VariableInitialization> declarations; | |
| 588 | |
| 589 VariableDeclarationList(this.declarations); | |
| 590 | |
| 591 accept(NodeVisitor visitor) => visitor.visitVariableDeclarationList(this); | |
| 592 | |
| 593 void visitChildren(NodeVisitor visitor) { | |
| 594 for (VariableInitialization declaration in declarations) { | |
| 595 declaration.accept(visitor); | |
| 596 } | |
| 597 } | |
| 598 | |
| 599 VariableDeclarationList _clone() => new VariableDeclarationList(declarations); | |
| 600 | |
| 601 int get precedenceLevel => EXPRESSION; | |
| 602 } | |
| 603 | |
| 604 class Assignment extends Expression { | |
| 605 final Expression leftHandSide; | |
| 606 final String op; // Null, if the assignment is not compound. | |
| 607 final Expression value; // May be null, for [VariableInitialization]s. | |
| 608 | |
| 609 Assignment(leftHandSide, value) | |
| 610 : this.compound(leftHandSide, null, value); | |
| 611 Assignment.compound(this.leftHandSide, this.op, this.value); | |
| 612 | |
| 613 int get precedenceLevel => ASSIGNMENT; | |
| 614 | |
| 615 bool get isCompound => op != null; | |
| 616 | |
| 617 accept(NodeVisitor visitor) => visitor.visitAssignment(this); | |
| 618 | |
| 619 void visitChildren(NodeVisitor visitor) { | |
| 620 leftHandSide.accept(visitor); | |
| 621 if (value != null) value.accept(visitor); | |
| 622 } | |
| 623 | |
| 624 Assignment _clone() => | |
| 625 new Assignment.compound(leftHandSide, op, value); | |
| 626 } | |
| 627 | |
| 628 class VariableInitialization extends Assignment { | |
| 629 /** [value] may be null. */ | |
| 630 VariableInitialization(VariableDeclaration declaration, Expression value) | |
| 631 : super(declaration, value); | |
| 632 | |
| 633 VariableDeclaration get declaration => leftHandSide; | |
| 634 | |
| 635 accept(NodeVisitor visitor) => visitor.visitVariableInitialization(this); | |
| 636 | |
| 637 VariableInitialization _clone() => | |
| 638 new VariableInitialization(declaration, value); | |
| 639 } | |
| 640 | |
| 641 class Conditional extends Expression { | |
| 642 final Expression condition; | |
| 643 final Expression then; | |
| 644 final Expression otherwise; | |
| 645 | |
| 646 Conditional(this.condition, this.then, this.otherwise); | |
| 647 | |
| 648 accept(NodeVisitor visitor) => visitor.visitConditional(this); | |
| 649 | |
| 650 void visitChildren(NodeVisitor visitor) { | |
| 651 condition.accept(visitor); | |
| 652 then.accept(visitor); | |
| 653 otherwise.accept(visitor); | |
| 654 } | |
| 655 | |
| 656 Conditional _clone() => new Conditional(condition, then, otherwise); | |
| 657 | |
| 658 int get precedenceLevel => ASSIGNMENT; | |
| 659 } | |
| 660 | |
| 661 class Call extends Expression { | |
| 662 Expression target; | |
| 663 List<Expression> arguments; | |
| 664 | |
| 665 Call(this.target, this.arguments); | |
| 666 | |
| 667 accept(NodeVisitor visitor) => visitor.visitCall(this); | |
| 668 | |
| 669 void visitChildren(NodeVisitor visitor) { | |
| 670 target.accept(visitor); | |
| 671 for (Expression arg in arguments) arg.accept(visitor); | |
| 672 } | |
| 673 | |
| 674 Call _clone() => new Call(target, arguments); | |
| 675 | |
| 676 int get precedenceLevel => CALL; | |
| 677 } | |
| 678 | |
| 679 class New extends Call { | |
| 680 New(Expression cls, List<Expression> arguments) : super(cls, arguments); | |
| 681 | |
| 682 accept(NodeVisitor visitor) => visitor.visitNew(this); | |
| 683 | |
| 684 New _clone() => new New(target, arguments); | |
| 685 } | |
| 686 | |
| 687 class Binary extends Expression { | |
| 688 final String op; | |
| 689 final Expression left; | |
| 690 final Expression right; | |
| 691 | |
| 692 Binary(this.op, this.left, this.right); | |
| 693 | |
| 694 accept(NodeVisitor visitor) => visitor.visitBinary(this); | |
| 695 | |
| 696 Binary _clone() => new Binary(op, left, right); | |
| 697 | |
| 698 void visitChildren(NodeVisitor visitor) { | |
| 699 left.accept(visitor); | |
| 700 right.accept(visitor); | |
| 701 } | |
| 702 | |
| 703 bool get isCommaOperator => op == ','; | |
| 704 | |
| 705 int get precedenceLevel { | |
| 706 // TODO(floitsch): switch to constant map. | |
| 707 switch (op) { | |
| 708 case "*": | |
| 709 case "/": | |
| 710 case "%": | |
| 711 return MULTIPLICATIVE; | |
| 712 case "+": | |
| 713 case "-": | |
| 714 return ADDITIVE; | |
| 715 case "<<": | |
| 716 case ">>": | |
| 717 case ">>>": | |
| 718 return SHIFT; | |
| 719 case "<": | |
| 720 case ">": | |
| 721 case "<=": | |
| 722 case ">=": | |
| 723 case "instanceof": | |
| 724 case "in": | |
| 725 return RELATIONAL; | |
| 726 case "==": | |
| 727 case "===": | |
| 728 case "!=": | |
| 729 case "!==": | |
| 730 return EQUALITY; | |
| 731 case "&": | |
| 732 return BIT_AND; | |
| 733 case "^": | |
| 734 return BIT_XOR; | |
| 735 case "|": | |
| 736 return BIT_OR; | |
| 737 case "&&": | |
| 738 return LOGICAL_AND; | |
| 739 case "||": | |
| 740 return LOGICAL_OR; | |
| 741 case ',': | |
| 742 return EXPRESSION; | |
| 743 default: | |
| 744 throw new leg.CompilerCancelledException( | |
| 745 "Internal Error: Unhandled binary operator: $op"); | |
| 746 } | |
| 747 } | |
| 748 } | |
| 749 | |
| 750 class Prefix extends Expression { | |
| 751 final String op; | |
| 752 final Expression argument; | |
| 753 | |
| 754 Prefix(this.op, this.argument); | |
| 755 | |
| 756 accept(NodeVisitor visitor) => visitor.visitPrefix(this); | |
| 757 | |
| 758 Prefix _clone() => new Prefix(op, argument); | |
| 759 | |
| 760 void visitChildren(NodeVisitor visitor) { | |
| 761 argument.accept(visitor); | |
| 762 } | |
| 763 | |
| 764 int get precedenceLevel => UNARY; | |
| 765 } | |
| 766 | |
| 767 class Postfix extends Expression { | |
| 768 final String op; | |
| 769 final Expression argument; | |
| 770 | |
| 771 Postfix(this.op, this.argument); | |
| 772 | |
| 773 accept(NodeVisitor visitor) => visitor.visitPostfix(this); | |
| 774 | |
| 775 Postfix _clone() => new Postfix(op, argument); | |
| 776 | |
| 777 void visitChildren(NodeVisitor visitor) { | |
| 778 argument.accept(visitor); | |
| 779 } | |
| 780 | |
| 781 | |
| 782 int get precedenceLevel => UNARY; | |
| 783 } | |
| 784 | |
| 785 abstract class VariableReference extends Expression { | |
| 786 final String name; | |
| 787 | |
| 788 VariableReference(this.name) { | |
| 789 assert(_identifierRE.hasMatch(name)); | |
| 790 } | |
| 791 static RegExp _identifierRE = new RegExp(r'^[A-Za-z_$][A-Za-z_$0-9]*$'); | |
| 792 | |
| 793 accept(NodeVisitor visitor); | |
| 794 int get precedenceLevel => PRIMARY; | |
| 795 void visitChildren(NodeVisitor visitor) {} | |
| 796 } | |
| 797 | |
| 798 class VariableUse extends VariableReference { | |
| 799 VariableUse(String name) : super(name); | |
| 800 | |
| 801 accept(NodeVisitor visitor) => visitor.visitVariableUse(this); | |
| 802 VariableUse _clone() => new VariableUse(name); | |
| 803 | |
| 804 VariableUse asVariableUse() => this; | |
| 805 | |
| 806 toString() => 'VariableUse($name)'; | |
| 807 } | |
| 808 | |
| 809 class VariableDeclaration extends VariableReference { | |
| 810 final bool allowRename; | |
| 811 VariableDeclaration(String name, {this.allowRename: true}) : super(name); | |
| 812 | |
| 813 accept(NodeVisitor visitor) => visitor.visitVariableDeclaration(this); | |
| 814 VariableDeclaration _clone() => new VariableDeclaration(name); | |
| 815 } | |
| 816 | |
| 817 class Parameter extends VariableDeclaration { | |
| 818 Parameter(String name) : super(name); | |
| 819 | |
| 820 accept(NodeVisitor visitor) => visitor.visitParameter(this); | |
| 821 Parameter _clone() => new Parameter(name); | |
| 822 } | |
| 823 | |
| 824 class This extends Parameter { | |
| 825 This() : super("this"); | |
| 826 | |
| 827 accept(NodeVisitor visitor) => visitor.visitThis(this); | |
| 828 This _clone() => new This(); | |
| 829 } | |
| 830 | |
| 831 class NamedFunction extends Expression { | |
| 832 final VariableDeclaration name; | |
| 833 final Fun function; | |
| 834 | |
| 835 NamedFunction(this.name, this.function); | |
| 836 | |
| 837 accept(NodeVisitor visitor) => visitor.visitNamedFunction(this); | |
| 838 | |
| 839 void visitChildren(NodeVisitor visitor) { | |
| 840 name.accept(visitor); | |
| 841 function.accept(visitor); | |
| 842 } | |
| 843 NamedFunction _clone() => new NamedFunction(name, function); | |
| 844 | |
| 845 int get precedenceLevel => CALL; | |
| 846 } | |
| 847 | |
| 848 class Fun extends Expression { | |
| 849 final List<Parameter> params; | |
| 850 final Block body; | |
| 851 | |
| 852 Fun(this.params, this.body); | |
| 853 | |
| 854 accept(NodeVisitor visitor) => visitor.visitFun(this); | |
| 855 | |
| 856 void visitChildren(NodeVisitor visitor) { | |
| 857 for (Parameter param in params) param.accept(visitor); | |
| 858 body.accept(visitor); | |
| 859 } | |
| 860 | |
| 861 Fun _clone() => new Fun(params, body); | |
| 862 | |
| 863 int get precedenceLevel => CALL; | |
| 864 } | |
| 865 | |
| 866 class PropertyAccess extends Expression { | |
| 867 final Expression receiver; | |
| 868 final Expression selector; | |
| 869 | |
| 870 PropertyAccess(this.receiver, this.selector); | |
| 871 PropertyAccess.field(this.receiver, String fieldName) | |
| 872 : selector = new LiteralString('"$fieldName"'); | |
| 873 PropertyAccess.indexed(this.receiver, int index) | |
| 874 : selector = new LiteralNumber('$index'); | |
| 875 | |
| 876 accept(NodeVisitor visitor) => visitor.visitAccess(this); | |
| 877 | |
| 878 void visitChildren(NodeVisitor visitor) { | |
| 879 receiver.accept(visitor); | |
| 880 selector.accept(visitor); | |
| 881 } | |
| 882 | |
| 883 PropertyAccess _clone() => new PropertyAccess(receiver, selector); | |
| 884 | |
| 885 int get precedenceLevel => CALL; | |
| 886 } | |
| 887 | |
| 888 abstract class Literal extends Expression { | |
| 889 void visitChildren(NodeVisitor visitor) {} | |
| 890 | |
| 891 int get precedenceLevel => PRIMARY; | |
| 892 } | |
| 893 | |
| 894 class LiteralBool extends Literal { | |
| 895 final bool value; | |
| 896 | |
| 897 LiteralBool(this.value); | |
| 898 | |
| 899 accept(NodeVisitor visitor) => visitor.visitLiteralBool(this); | |
| 900 // [visitChildren] inherited from [Literal]. | |
| 901 LiteralBool _clone() => new LiteralBool(value); | |
| 902 } | |
| 903 | |
| 904 class LiteralNull extends Literal { | |
| 905 LiteralNull(); | |
| 906 | |
| 907 accept(NodeVisitor visitor) => visitor.visitLiteralNull(this); | |
| 908 LiteralNull _clone() => new LiteralNull(); | |
| 909 } | |
| 910 | |
| 911 class LiteralString extends Literal { | |
| 912 final String value; | |
| 913 | |
| 914 /** | |
| 915 * Constructs a LiteralString from a string value. | |
| 916 * | |
| 917 * The constructor does not add the required quotes. If [value] is | |
| 918 * not surrounded by quotes, the resulting object is invalid as a JS | |
| 919 * value. | |
| 920 */ | |
| 921 LiteralString(this.value); | |
| 922 | |
| 923 accept(NodeVisitor visitor) => visitor.visitLiteralString(this); | |
| 924 LiteralString _clone() => new LiteralString(value); | |
| 925 } | |
| 926 | |
| 927 class LiteralNumber extends Literal { | |
| 928 final String value; | |
| 929 | |
| 930 LiteralNumber(this.value); | |
| 931 | |
| 932 accept(NodeVisitor visitor) => visitor.visitLiteralNumber(this); | |
| 933 LiteralNumber _clone() => new LiteralNumber(value); | |
| 934 } | |
| 935 | |
| 936 class ArrayInitializer extends Expression { | |
| 937 final int length; | |
| 938 // We represent the array as sparse list of elements. Each element knows its | |
| 939 // position in the array. | |
| 940 final List<ArrayElement> elements; | |
| 941 | |
| 942 ArrayInitializer(this.length, this.elements); | |
| 943 | |
| 944 factory ArrayInitializer.from(Iterable<Expression> expressions) { | |
| 945 List<ArrayElement> elements = _convert(expressions); | |
| 946 return new ArrayInitializer(elements.length, elements); | |
| 947 } | |
| 948 | |
| 949 accept(NodeVisitor visitor) => visitor.visitArrayInitializer(this); | |
| 950 | |
| 951 void visitChildren(NodeVisitor visitor) { | |
| 952 for (ArrayElement element in elements) element.accept(visitor); | |
| 953 } | |
| 954 | |
| 955 ArrayInitializer _clone() => new ArrayInitializer(length, elements); | |
| 956 | |
| 957 int get precedenceLevel => PRIMARY; | |
| 958 | |
| 959 static List<ArrayElement> _convert(Iterable<Expression> expressions) { | |
| 960 int index = 0; | |
| 961 return expressions.map( | |
| 962 (expression) => new ArrayElement(index++, expression)) | |
| 963 .toList(); | |
| 964 } | |
| 965 } | |
| 966 | |
| 967 /** | |
| 968 * An expression inside an [ArrayInitializer]. An [ArrayElement] knows | |
| 969 * its position in the containing [ArrayInitializer]. | |
| 970 */ | |
| 971 class ArrayElement extends Node { | |
| 972 final int index; | |
| 973 final Expression value; | |
| 974 | |
| 975 ArrayElement(this.index, this.value); | |
| 976 | |
| 977 accept(NodeVisitor visitor) => visitor.visitArrayElement(this); | |
| 978 | |
| 979 void visitChildren(NodeVisitor visitor) { | |
| 980 value.accept(visitor); | |
| 981 } | |
| 982 | |
| 983 ArrayElement _clone() => new ArrayElement(index, value); | |
| 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 name; // 'int' for positional interpolated nodes, 'String' for named. | |
| 1030 } | |
| 1031 | |
| 1032 class InterpolatedExpression extends Expression implements InterpolatedNode { | |
| 1033 final name; | |
| 1034 | |
| 1035 InterpolatedExpression(this.name); | |
| 1036 | |
| 1037 accept(NodeVisitor visitor) => visitor.visitInterpolatedExpression(this); | |
| 1038 void visitChildren(NodeVisitor visitor) {} | |
| 1039 InterpolatedExpression _clone() => new InterpolatedExpression(name); | |
| 1040 | |
| 1041 int get precedenceLevel => PRIMARY; | |
| 1042 } | |
| 1043 | |
| 1044 class InterpolatedLiteral extends Literal implements InterpolatedNode { | |
| 1045 final name; | |
| 1046 | |
| 1047 InterpolatedLiteral(this.name); | |
| 1048 | |
| 1049 accept(NodeVisitor visitor) => visitor.visitInterpolatedLiteral(this); | |
| 1050 void visitChildren(NodeVisitor visitor) {} | |
| 1051 InterpolatedLiteral _clone() => new InterpolatedLiteral(name); | |
| 1052 } | |
| 1053 | |
| 1054 class InterpolatedParameter extends Expression | |
| 1055 implements Parameter, InterpolatedNode { | |
| 1056 final name; | |
| 1057 bool get allowRename => false; | |
| 1058 | |
| 1059 InterpolatedParameter(this.name); | |
| 1060 | |
| 1061 accept(NodeVisitor visitor) => visitor.visitInterpolatedParameter(this); | |
| 1062 void visitChildren(NodeVisitor visitor) {} | |
| 1063 InterpolatedParameter _clone() => new InterpolatedParameter(name); | |
| 1064 | |
| 1065 int get precedenceLevel => PRIMARY; | |
| 1066 } | |
| 1067 | |
| 1068 class InterpolatedSelector extends Expression implements InterpolatedNode { | |
| 1069 final name; | |
| 1070 | |
| 1071 InterpolatedSelector(this.name); | |
| 1072 | |
| 1073 accept(NodeVisitor visitor) => visitor.visitInterpolatedSelector(this); | |
| 1074 void visitChildren(NodeVisitor visitor) {} | |
| 1075 InterpolatedSelector _clone() => new InterpolatedSelector(name); | |
| 1076 | |
| 1077 int get precedenceLevel => PRIMARY; | |
| 1078 } | |
| 1079 | |
| 1080 class InterpolatedStatement extends Statement implements InterpolatedNode { | |
| 1081 final name; | |
| 1082 | |
| 1083 InterpolatedStatement(this.name); | |
| 1084 | |
| 1085 accept(NodeVisitor visitor) => visitor.visitInterpolatedStatement(this); | |
| 1086 void visitChildren(NodeVisitor visitor) {} | |
| 1087 InterpolatedStatement _clone() => new InterpolatedStatement(name); | |
| 1088 } | |
| 1089 | |
| 1090 /** | |
| 1091 * [RegExpLiteral]s, despite being called "Literal", do not inherit from | |
| 1092 * [Literal]. Indeed, regular expressions in JavaScript have a side-effect and | |
| 1093 * are thus not in the same category as numbers or strings. | |
| 1094 */ | |
| 1095 class RegExpLiteral extends Expression { | |
| 1096 /** Contains the pattern and the flags.*/ | |
| 1097 final String pattern; | |
| 1098 | |
| 1099 RegExpLiteral(this.pattern); | |
| 1100 | |
| 1101 accept(NodeVisitor visitor) => visitor.visitRegExpLiteral(this); | |
| 1102 void visitChildren(NodeVisitor visitor) {} | |
| 1103 RegExpLiteral _clone() => new RegExpLiteral(pattern); | |
| 1104 | |
| 1105 int get precedenceLevel => PRIMARY; | |
| 1106 } | |
| 1107 | |
| 1108 /** | |
| 1109 * A comment. | |
| 1110 * | |
| 1111 * Extends [Statement] so we can add comments before statements in | |
| 1112 * [Block] and [Program]. | |
| 1113 */ | |
| 1114 class Comment extends Statement { | |
| 1115 final String comment; | |
| 1116 | |
| 1117 Comment(this.comment); | |
| 1118 | |
| 1119 accept(NodeVisitor visitor) => visitor.visitComment(this); | |
| 1120 Comment _clone() => new Comment(comment); | |
| 1121 | |
| 1122 void visitChildren(NodeVisitor visitor) {} | |
| 1123 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 694353007:
Move dart2js from sdk/lib/_internal/compiler to pkg/compiler (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart