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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> implements TypeRefVisitor<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 visitForOf(ForOf node); | |
| 17 T visitWhile(While node); | |
| 18 T visitDo(Do node); | |
| 19 T visitContinue(Continue node); | |
| 20 T visitBreak(Break node); | |
| 21 T visitReturn(Return node); | |
| 22 T visitThrow(Throw node); | |
| 23 T visitTry(Try node); | |
| 24 T visitCatch(Catch node); | |
| 25 T visitSwitch(Switch node); | |
| 26 T visitCase(Case node); | |
| 27 T visitDefault(Default node); | |
| 28 T visitFunctionDeclaration(FunctionDeclaration node); | |
| 29 T visitLabeledStatement(LabeledStatement node); | |
| 30 T visitLiteralStatement(LiteralStatement node); | |
| 31 T visitDartYield(DartYield node); | |
| 32 | |
| 33 T visitLiteralExpression(LiteralExpression node); | |
| 34 T visitVariableDeclarationList(VariableDeclarationList node); | |
| 35 T visitAssignment(Assignment node); | |
| 36 T visitVariableInitialization(VariableInitialization node); | |
| 37 T visitConditional(Conditional cond); | |
| 38 T visitNew(New node); | |
| 39 T visitCall(Call node); | |
| 40 T visitBinary(Binary node); | |
| 41 T visitPrefix(Prefix node); | |
| 42 T visitPostfix(Postfix node); | |
| 43 T visitSpread(Spread node); | |
| 44 T visitYield(Yield node); | |
| 45 | |
| 46 T visitIdentifier(Identifier node); | |
| 47 T visitThis(This node); | |
| 48 T visitSuper(Super node); | |
| 49 T visitAccess(PropertyAccess node); | |
| 50 T visitRestParameter(RestParameter node); | |
| 51 | |
| 52 T visitNamedFunction(NamedFunction node); | |
| 53 T visitFun(Fun node); | |
| 54 T visitArrowFun(ArrowFun node); | |
| 55 | |
| 56 T visitLiteralBool(LiteralBool node); | |
| 57 T visitLiteralString(LiteralString node); | |
| 58 T visitLiteralNumber(LiteralNumber node); | |
| 59 T visitLiteralNull(LiteralNull node); | |
| 60 | |
| 61 T visitArrayInitializer(ArrayInitializer node); | |
| 62 T visitArrayHole(ArrayHole node); | |
| 63 T visitObjectInitializer(ObjectInitializer node); | |
| 64 T visitProperty(Property node); | |
| 65 T visitRegExpLiteral(RegExpLiteral node); | |
| 66 T visitTemplateString(TemplateString node); | |
| 67 T visitTaggedTemplate(TaggedTemplate node); | |
| 68 | |
| 69 T visitAwait(Await node); | |
| 70 | |
| 71 T visitClassDeclaration(ClassDeclaration node); | |
| 72 T visitClassExpression(ClassExpression node); | |
| 73 T visitMethod(Method node); | |
| 74 | |
| 75 T visitImportDeclaration(ImportDeclaration node); | |
| 76 T visitExportDeclaration(ExportDeclaration node); | |
| 77 T visitExportClause(ExportClause node); | |
| 78 T visitNameSpecifier(NameSpecifier node); | |
| 79 T visitModule(Module node); | |
| 80 | |
| 81 T visitComment(Comment node); | |
| 82 T visitCommentExpression(CommentExpression node); | |
| 83 | |
| 84 T visitInterpolatedExpression(InterpolatedExpression node); | |
| 85 T visitInterpolatedLiteral(InterpolatedLiteral node); | |
| 86 T visitInterpolatedParameter(InterpolatedParameter node); | |
| 87 T visitInterpolatedSelector(InterpolatedSelector node); | |
| 88 T visitInterpolatedStatement(InterpolatedStatement node); | |
| 89 T visitInterpolatedMethod(InterpolatedMethod node); | |
| 90 T visitInterpolatedIdentifier(InterpolatedIdentifier node); | |
| 91 | |
| 92 T visitArrayBindingPattern(ArrayBindingPattern node); | |
| 93 T visitObjectBindingPattern(ObjectBindingPattern node); | |
| 94 T visitDestructuredVariable(DestructuredVariable node); | |
| 95 T visitSimpleBindingPattern(SimpleBindingPattern node); | |
| 96 } | |
| 97 | |
| 98 abstract class TypeRefVisitor<T> { | |
| 99 T visitQualifiedTypeRef(QualifiedTypeRef node); | |
| 100 T visitGenericTypeRef(GenericTypeRef node); | |
| 101 T visitUnionTypeRef(UnionTypeRef node); | |
| 102 T visitRecordTypeRef(RecordTypeRef node); | |
| 103 T visitOptionalTypeRef(OptionalTypeRef node); | |
| 104 T visitFunctionTypeRef(FunctionTypeRef node); | |
| 105 T visitAnyTypeRef(AnyTypeRef node); | |
| 106 T visitUnknownTypeRef(UnknownTypeRef node); | |
| 107 T visitArrayTypeRef(ArrayTypeRef node); | |
| 108 } | |
| 109 | |
| 110 class BaseVisitor<T> implements NodeVisitor<T> { | |
| 111 T visitNode(Node node) { | |
| 112 node.visitChildren(this); | |
| 113 return null; | |
| 114 } | |
| 115 | |
| 116 T visitProgram(Program node) => visitNode(node); | |
| 117 | |
| 118 T visitStatement(Statement node) => visitModuleItem(node); | |
| 119 T visitLoop(Loop node) => visitStatement(node); | |
| 120 T visitJump(Statement node) => visitStatement(node); | |
| 121 | |
| 122 T visitBlock(Block node) => visitStatement(node); | |
| 123 T visitExpressionStatement(ExpressionStatement node) | |
| 124 => visitStatement(node); | |
| 125 T visitEmptyStatement(EmptyStatement node) => visitStatement(node); | |
| 126 T visitIf(If node) => visitStatement(node); | |
| 127 T visitFor(For node) => visitLoop(node); | |
| 128 T visitForIn(ForIn node) => visitLoop(node); | |
| 129 T visitForOf(ForOf node) => visitLoop(node); | |
| 130 T visitWhile(While node) => visitLoop(node); | |
| 131 T visitDo(Do node) => visitLoop(node); | |
| 132 T visitContinue(Continue node) => visitJump(node); | |
| 133 T visitBreak(Break node) => visitJump(node); | |
| 134 T visitReturn(Return node) => visitJump(node); | |
| 135 T visitThrow(Throw node) => visitJump(node); | |
| 136 T visitTry(Try node) => visitStatement(node); | |
| 137 T visitSwitch(Switch node) => visitStatement(node); | |
| 138 T visitFunctionDeclaration(FunctionDeclaration node) | |
| 139 => visitStatement(node); | |
| 140 T visitLabeledStatement(LabeledStatement node) => visitStatement(node); | |
| 141 T visitLiteralStatement(LiteralStatement node) => visitStatement(node); | |
| 142 | |
| 143 T visitCatch(Catch node) => visitNode(node); | |
| 144 T visitCase(Case node) => visitNode(node); | |
| 145 T visitDefault(Default node) => visitNode(node); | |
| 146 | |
| 147 T visitExpression(Expression node) => visitNode(node); | |
| 148 | |
| 149 T visitLiteralExpression(LiteralExpression node) => visitExpression(node); | |
| 150 T visitVariableDeclarationList(VariableDeclarationList node) | |
| 151 => visitExpression(node); | |
| 152 T visitAssignment(Assignment node) => visitExpression(node); | |
| 153 T visitVariableInitialization(VariableInitialization node) { | |
| 154 if (node.value != null) { | |
| 155 return visitAssignment(node); | |
| 156 } else { | |
| 157 return visitExpression(node); | |
| 158 } | |
| 159 } | |
| 160 T visitConditional(Conditional node) => visitExpression(node); | |
| 161 T visitNew(New node) => visitExpression(node); | |
| 162 T visitCall(Call node) => visitExpression(node); | |
| 163 T visitBinary(Binary node) => visitExpression(node); | |
| 164 T visitPrefix(Prefix node) => visitExpression(node); | |
| 165 T visitPostfix(Postfix node) => visitExpression(node); | |
| 166 T visitSpread(Spread node) => visitPrefix(node); | |
| 167 T visitYield(Yield node) => visitExpression(node); | |
| 168 T visitAccess(PropertyAccess node) => visitExpression(node); | |
| 169 | |
| 170 T visitIdentifier(Identifier node) => visitExpression(node); | |
| 171 T visitThis(This node) => visitExpression(node); | |
| 172 T visitSuper(Super node) => visitExpression(node); | |
| 173 | |
| 174 T visitRestParameter(RestParameter node) => visitNode(node); | |
| 175 | |
| 176 T visitNamedFunction(NamedFunction node) => visitExpression(node); | |
| 177 T visitFunctionExpression(FunctionExpression node) => visitExpression(node); | |
| 178 T visitFun(Fun node) => visitFunctionExpression(node); | |
| 179 T visitArrowFun(ArrowFun node) => visitFunctionExpression(node); | |
| 180 | |
| 181 T visitLiteral(Literal node) => visitExpression(node); | |
| 182 | |
| 183 T visitLiteralBool(LiteralBool node) => visitLiteral(node); | |
| 184 T visitLiteralString(LiteralString node) => visitLiteral(node); | |
| 185 T visitLiteralNumber(LiteralNumber node) => visitLiteral(node); | |
| 186 T visitLiteralNull(LiteralNull node) => visitLiteral(node); | |
| 187 | |
| 188 T visitArrayInitializer(ArrayInitializer node) => visitExpression(node); | |
| 189 T visitArrayHole(ArrayHole node) => visitExpression(node); | |
| 190 T visitObjectInitializer(ObjectInitializer node) => visitExpression(node); | |
| 191 T visitProperty(Property node) => visitNode(node); | |
| 192 T visitRegExpLiteral(RegExpLiteral node) => visitExpression(node); | |
| 193 T visitTemplateString(TemplateString node) => visitExpression(node); | |
| 194 T visitTaggedTemplate(TaggedTemplate node) => visitExpression(node); | |
| 195 | |
| 196 T visitClassDeclaration(ClassDeclaration node) => visitStatement(node); | |
| 197 T visitClassExpression(ClassExpression node) => visitExpression(node); | |
| 198 T visitMethod(Method node) => visitProperty(node); | |
| 199 | |
| 200 T visitModuleItem(ModuleItem node) => visitNode(node); | |
| 201 T visitImportDeclaration(ImportDeclaration node) => visitModuleItem(node); | |
| 202 T visitExportDeclaration(ExportDeclaration node) => visitModuleItem(node); | |
| 203 T visitExportClause(ExportClause node) => visitNode(node); | |
| 204 T visitNameSpecifier(NameSpecifier node) => visitNode(node); | |
| 205 T visitModule(Module node) => visitNode(node); | |
| 206 | |
| 207 T visitInterpolatedNode(InterpolatedNode node) => visitNode(node); | |
| 208 | |
| 209 T visitInterpolatedExpression(InterpolatedExpression node) | |
| 210 => visitInterpolatedNode(node); | |
| 211 T visitInterpolatedLiteral(InterpolatedLiteral node) | |
| 212 => visitInterpolatedNode(node); | |
| 213 T visitInterpolatedParameter(InterpolatedParameter node) | |
| 214 => visitInterpolatedNode(node); | |
| 215 T visitInterpolatedSelector(InterpolatedSelector node) | |
| 216 => visitInterpolatedNode(node); | |
| 217 T visitInterpolatedStatement(InterpolatedStatement node) | |
| 218 => visitInterpolatedNode(node); | |
| 219 T visitInterpolatedMethod(InterpolatedMethod node) | |
| 220 => visitInterpolatedNode(node); | |
| 221 T visitInterpolatedIdentifier(InterpolatedIdentifier node) | |
| 222 => visitInterpolatedNode(node); | |
| 223 | |
| 224 // Ignore comments by default. | |
| 225 T visitComment(Comment node) => null; | |
| 226 T visitCommentExpression(CommentExpression node) => null; | |
| 227 | |
| 228 T visitAwait(Await node) => visitExpression(node); | |
| 229 T visitDartYield(DartYield node) => visitStatement(node); | |
| 230 | |
| 231 T visitBindingPattern(BindingPattern node) => visitNode(node); | |
| 232 T visitArrayBindingPattern(ArrayBindingPattern node) | |
| 233 => visitBindingPattern(node); | |
| 234 T visitObjectBindingPattern(ObjectBindingPattern node) | |
| 235 => visitBindingPattern(node); | |
| 236 T visitDestructuredVariable(DestructuredVariable node) => visitNode(node); | |
| 237 T visitSimpleBindingPattern(SimpleBindingPattern node) => visitNode(node); | |
| 238 | |
| 239 T visitTypeRef(TypeRef node) => visitNode(node); | |
| 240 T visitQualifiedTypeRef(QualifiedTypeRef node) => visitTypeRef(node); | |
| 241 T visitGenericTypeRef(GenericTypeRef node) => visitTypeRef(node); | |
| 242 T visitOptionalTypeRef(OptionalTypeRef node) => visitTypeRef(node); | |
| 243 T visitRecordTypeRef(RecordTypeRef node) => visitTypeRef(node); | |
| 244 T visitUnionTypeRef(UnionTypeRef node) => visitTypeRef(node); | |
| 245 T visitFunctionTypeRef(FunctionTypeRef node) => visitTypeRef(node); | |
| 246 T visitAnyTypeRef(AnyTypeRef node) => visitTypeRef(node); | |
| 247 T visitUnknownTypeRef(UnknownTypeRef node) => visitTypeRef(node); | |
| 248 T visitArrayTypeRef(ArrayTypeRef node) => visitTypeRef(node); | |
| 249 } | |
| 250 | |
| 251 abstract class Node { | |
| 252 /// Sets the source location of this node. For performance reasons, we allow | |
| 253 /// setting this after construction. | |
| 254 Object sourceInformation; | |
| 255 | |
| 256 ClosureAnnotation _closureAnnotation; | |
| 257 /// Closure annotation of this node. | |
| 258 ClosureAnnotation get closureAnnotation => _closureAnnotation; | |
| 259 | |
| 260 accept(NodeVisitor visitor); | |
| 261 void visitChildren(NodeVisitor visitor); | |
| 262 | |
| 263 // Shallow clone of node. Does not clone positions since the only use of this | |
| 264 // private method is create a copy with a new position. | |
| 265 Node _clone(); | |
| 266 | |
| 267 withClosureAnnotation(ClosureAnnotation closureAnnotation) { | |
| 268 if (this.closureAnnotation == closureAnnotation) return this; | |
| 269 | |
| 270 return _clone() | |
| 271 ..sourceInformation = sourceInformation | |
| 272 .._closureAnnotation = closureAnnotation; | |
| 273 } | |
| 274 // Returns a node equivalent to [this], but with new source position and end | |
| 275 // source position. | |
| 276 Node withSourceInformation(sourceInformation) { | |
| 277 if (sourceInformation == this.sourceInformation) { | |
| 278 return this; | |
| 279 } | |
| 280 Node clone = _clone(); | |
| 281 // TODO(sra): Should existing data be 'sticky' if we try to overwrite with | |
| 282 // `null`? | |
| 283 clone.sourceInformation = sourceInformation; | |
| 284 return clone; | |
| 285 } | |
| 286 | |
| 287 bool get isCommaOperator => false; | |
| 288 | |
| 289 Statement toStatement() { | |
| 290 throw new UnsupportedError('toStatement'); | |
| 291 } | |
| 292 Statement toReturn() { | |
| 293 throw new UnsupportedError('toReturn'); | |
| 294 } | |
| 295 | |
| 296 // For debugging | |
| 297 String toString() { | |
| 298 var context = new SimpleJavaScriptPrintingContext(); | |
| 299 var opts = new JavaScriptPrintingOptions(allowKeywordsInProperties: true); | |
| 300 context.buffer.write('js_ast `'); | |
| 301 accept(new Printer(opts, context)); | |
| 302 context.buffer.write('`'); | |
| 303 return context.getText(); | |
| 304 } | |
| 305 } | |
| 306 | |
| 307 class Program extends Node { | |
| 308 /// Script tag hash-bang, e.g. `#!/usr/bin/env node` | |
| 309 final String scriptTag; | |
| 310 | |
| 311 /// Top-level statements in the program. | |
| 312 final List<ModuleItem> body; | |
| 313 | |
| 314 Program(this.body, {this.scriptTag}); | |
| 315 | |
| 316 accept(NodeVisitor visitor) => visitor.visitProgram(this); | |
| 317 void visitChildren(NodeVisitor visitor) { | |
| 318 for (ModuleItem statement in body) statement.accept(visitor); | |
| 319 } | |
| 320 Program _clone() => new Program(body); | |
| 321 } | |
| 322 | |
| 323 abstract class Statement extends ModuleItem { | |
| 324 Statement toStatement() => this; | |
| 325 Statement toReturn() => new Block([this, new Return()]); | |
| 326 } | |
| 327 | |
| 328 class Block extends Statement { | |
| 329 final List<Statement> statements; | |
| 330 | |
| 331 /// True to preserve this [Block] for scoping reasons. | |
| 332 final bool isScope; | |
| 333 | |
| 334 Block(this.statements, {this.isScope: false}) { | |
| 335 assert(!statements.any((s) => s is! Statement)); | |
| 336 } | |
| 337 Block.empty() : statements = <Statement>[], isScope = false; | |
| 338 | |
| 339 accept(NodeVisitor visitor) => visitor.visitBlock(this); | |
| 340 void visitChildren(NodeVisitor visitor) { | |
| 341 for (Statement statement in statements) statement.accept(visitor); | |
| 342 } | |
| 343 Block _clone() => new Block(statements); | |
| 344 } | |
| 345 | |
| 346 class ExpressionStatement extends Statement { | |
| 347 final Expression expression; | |
| 348 ExpressionStatement(this.expression); | |
| 349 | |
| 350 accept(NodeVisitor visitor) => visitor.visitExpressionStatement(this); | |
| 351 void visitChildren(NodeVisitor visitor) { expression.accept(visitor); } | |
| 352 ExpressionStatement _clone() => new ExpressionStatement(expression); | |
| 353 } | |
| 354 | |
| 355 class EmptyStatement extends Statement { | |
| 356 EmptyStatement(); | |
| 357 | |
| 358 accept(NodeVisitor visitor) => visitor.visitEmptyStatement(this); | |
| 359 void visitChildren(NodeVisitor visitor) {} | |
| 360 EmptyStatement _clone() => new EmptyStatement(); | |
| 361 } | |
| 362 | |
| 363 class If extends Statement { | |
| 364 final Expression condition; | |
| 365 final Node then; | |
| 366 final Node otherwise; | |
| 367 | |
| 368 If(this.condition, this.then, this.otherwise); | |
| 369 If.noElse(this.condition, this.then) : this.otherwise = null; | |
| 370 | |
| 371 bool get hasElse => otherwise != null; | |
| 372 | |
| 373 accept(NodeVisitor visitor) => visitor.visitIf(this); | |
| 374 | |
| 375 void visitChildren(NodeVisitor visitor) { | |
| 376 condition.accept(visitor); | |
| 377 then.accept(visitor); | |
| 378 if (otherwise != null) otherwise.accept(visitor); | |
| 379 } | |
| 380 | |
| 381 If _clone() => new If(condition, then, otherwise); | |
| 382 } | |
| 383 | |
| 384 abstract class Loop extends Statement { | |
| 385 final Statement body; | |
| 386 Loop(this.body); | |
| 387 } | |
| 388 | |
| 389 class For extends Loop { | |
| 390 final Expression init; | |
| 391 final Expression condition; | |
| 392 final Expression update; | |
| 393 | |
| 394 For(this.init, this.condition, this.update, Statement body) : super(body); | |
| 395 | |
| 396 accept(NodeVisitor visitor) => visitor.visitFor(this); | |
| 397 | |
| 398 void visitChildren(NodeVisitor visitor) { | |
| 399 if (init != null) init.accept(visitor); | |
| 400 if (condition != null) condition.accept(visitor); | |
| 401 if (update != null) update.accept(visitor); | |
| 402 body.accept(visitor); | |
| 403 } | |
| 404 | |
| 405 For _clone() => new For(init, condition, update, body); | |
| 406 } | |
| 407 | |
| 408 class ForIn extends Loop { | |
| 409 // Note that [VariableDeclarationList] is a subclass of [Expression]. | |
| 410 // Therefore we can type the leftHandSide as [Expression]. | |
| 411 final Expression leftHandSide; | |
| 412 final Expression object; | |
| 413 | |
| 414 ForIn(this.leftHandSide, this.object, Statement body) : super(body); | |
| 415 | |
| 416 accept(NodeVisitor visitor) => visitor.visitForIn(this); | |
| 417 | |
| 418 void visitChildren(NodeVisitor visitor) { | |
| 419 leftHandSide.accept(visitor); | |
| 420 object.accept(visitor); | |
| 421 body.accept(visitor); | |
| 422 } | |
| 423 | |
| 424 ForIn _clone() => new ForIn(leftHandSide, object, body); | |
| 425 } | |
| 426 | |
| 427 class ForOf extends Loop { | |
| 428 // Note that [VariableDeclarationList] is a subclass of [Expression]. | |
| 429 // Therefore we can type the leftHandSide as [Expression]. | |
| 430 final Expression leftHandSide; | |
| 431 final Expression iterable; | |
| 432 | |
| 433 ForOf(this.leftHandSide, this.iterable, Statement body) : super(body); | |
| 434 | |
| 435 accept(NodeVisitor visitor) => visitor.visitForOf(this); | |
| 436 | |
| 437 void visitChildren(NodeVisitor visitor) { | |
| 438 leftHandSide.accept(visitor); | |
| 439 iterable.accept(visitor); | |
| 440 body.accept(visitor); | |
| 441 } | |
| 442 | |
| 443 ForIn _clone() => new ForIn(leftHandSide, iterable, body); | |
| 444 } | |
| 445 | |
| 446 class While extends Loop { | |
| 447 final Node condition; | |
| 448 | |
| 449 While(this.condition, Statement body) : super(body); | |
| 450 | |
| 451 accept(NodeVisitor visitor) => visitor.visitWhile(this); | |
| 452 | |
| 453 void visitChildren(NodeVisitor visitor) { | |
| 454 condition.accept(visitor); | |
| 455 body.accept(visitor); | |
| 456 } | |
| 457 | |
| 458 While _clone() => new While(condition, body); | |
| 459 } | |
| 460 | |
| 461 class Do extends Loop { | |
| 462 final Expression condition; | |
| 463 | |
| 464 Do(Statement body, this.condition) : super(body); | |
| 465 | |
| 466 accept(NodeVisitor visitor) => visitor.visitDo(this); | |
| 467 | |
| 468 void visitChildren(NodeVisitor visitor) { | |
| 469 body.accept(visitor); | |
| 470 condition.accept(visitor); | |
| 471 } | |
| 472 | |
| 473 Do _clone() => new Do(body, condition); | |
| 474 } | |
| 475 | |
| 476 class Continue extends Statement { | |
| 477 final String targetLabel; // Can be null. | |
| 478 | |
| 479 Continue(this.targetLabel); | |
| 480 | |
| 481 accept(NodeVisitor visitor) => visitor.visitContinue(this); | |
| 482 void visitChildren(NodeVisitor visitor) {} | |
| 483 | |
| 484 Continue _clone() => new Continue(targetLabel); | |
| 485 } | |
| 486 | |
| 487 class Break extends Statement { | |
| 488 final String targetLabel; // Can be null. | |
| 489 | |
| 490 Break(this.targetLabel); | |
| 491 | |
| 492 accept(NodeVisitor visitor) => visitor.visitBreak(this); | |
| 493 void visitChildren(NodeVisitor visitor) {} | |
| 494 | |
| 495 Break _clone() => new Break(targetLabel); | |
| 496 } | |
| 497 | |
| 498 class Return extends Statement { | |
| 499 final Expression value; // Can be null. | |
| 500 | |
| 501 Return([this.value = null]); | |
| 502 | |
| 503 Statement toReturn() => this; | |
| 504 | |
| 505 accept(NodeVisitor visitor) => visitor.visitReturn(this); | |
| 506 | |
| 507 void visitChildren(NodeVisitor visitor) { | |
| 508 if (value != null) value.accept(visitor); | |
| 509 } | |
| 510 | |
| 511 Return _clone() => new Return(value); | |
| 512 | |
| 513 static bool foundIn(Node node) { | |
| 514 _returnFinder.found = false; | |
| 515 node.accept(_returnFinder); | |
| 516 return _returnFinder.found; | |
| 517 } | |
| 518 } | |
| 519 | |
| 520 final _returnFinder = new _ReturnFinder(); | |
| 521 class _ReturnFinder extends BaseVisitor { | |
| 522 bool found = false; | |
| 523 visitReturn(Return node) { | |
| 524 found = true; | |
| 525 } | |
| 526 visitNode(Node node) { | |
| 527 if (!found) super.visitNode(node); | |
| 528 } | |
| 529 } | |
| 530 | |
| 531 | |
| 532 class Throw extends Statement { | |
| 533 final Expression expression; | |
| 534 | |
| 535 Throw(this.expression); | |
| 536 | |
| 537 accept(NodeVisitor visitor) => visitor.visitThrow(this); | |
| 538 | |
| 539 void visitChildren(NodeVisitor visitor) { | |
| 540 expression.accept(visitor); | |
| 541 } | |
| 542 | |
| 543 Throw _clone() => new Throw(expression); | |
| 544 } | |
| 545 | |
| 546 class Try extends Statement { | |
| 547 final Block body; | |
| 548 final Catch catchPart; // Can be null if [finallyPart] is non-null. | |
| 549 final Block finallyPart; // Can be null if [catchPart] is non-null. | |
| 550 | |
| 551 Try(this.body, this.catchPart, this.finallyPart) { | |
| 552 assert(catchPart != null || finallyPart != null); | |
| 553 } | |
| 554 | |
| 555 accept(NodeVisitor visitor) => visitor.visitTry(this); | |
| 556 | |
| 557 void visitChildren(NodeVisitor visitor) { | |
| 558 body.accept(visitor); | |
| 559 if (catchPart != null) catchPart.accept(visitor); | |
| 560 if (finallyPart != null) finallyPart.accept(visitor); | |
| 561 } | |
| 562 | |
| 563 Try _clone() => new Try(body, catchPart, finallyPart); | |
| 564 } | |
| 565 | |
| 566 class Catch extends Node { | |
| 567 final Identifier declaration; | |
| 568 final Block body; | |
| 569 | |
| 570 Catch(this.declaration, this.body); | |
| 571 | |
| 572 accept(NodeVisitor visitor) => visitor.visitCatch(this); | |
| 573 | |
| 574 void visitChildren(NodeVisitor visitor) { | |
| 575 declaration.accept(visitor); | |
| 576 body.accept(visitor); | |
| 577 } | |
| 578 | |
| 579 Catch _clone() => new Catch(declaration, body); | |
| 580 } | |
| 581 | |
| 582 class Switch extends Statement { | |
| 583 final Expression key; | |
| 584 final List<SwitchClause> cases; | |
| 585 | |
| 586 Switch(this.key, this.cases); | |
| 587 | |
| 588 accept(NodeVisitor visitor) => visitor.visitSwitch(this); | |
| 589 | |
| 590 void visitChildren(NodeVisitor visitor) { | |
| 591 key.accept(visitor); | |
| 592 for (SwitchClause clause in cases) clause.accept(visitor); | |
| 593 } | |
| 594 | |
| 595 Switch _clone() => new Switch(key, cases); | |
| 596 } | |
| 597 | |
| 598 abstract class SwitchClause extends Node { | |
| 599 final Block body; | |
| 600 | |
| 601 SwitchClause(this.body); | |
| 602 } | |
| 603 | |
| 604 class Case extends SwitchClause { | |
| 605 final Expression expression; | |
| 606 | |
| 607 Case(this.expression, Block body) : super(body); | |
| 608 | |
| 609 accept(NodeVisitor visitor) => visitor.visitCase(this); | |
| 610 | |
| 611 void visitChildren(NodeVisitor visitor) { | |
| 612 expression.accept(visitor); | |
| 613 body.accept(visitor); | |
| 614 } | |
| 615 | |
| 616 Case _clone() => new Case(expression, body); | |
| 617 } | |
| 618 | |
| 619 class Default extends SwitchClause { | |
| 620 Default(Block body) : super(body); | |
| 621 | |
| 622 accept(NodeVisitor visitor) => visitor.visitDefault(this); | |
| 623 | |
| 624 void visitChildren(NodeVisitor visitor) { | |
| 625 body.accept(visitor); | |
| 626 } | |
| 627 | |
| 628 Default _clone() => new Default(body); | |
| 629 } | |
| 630 | |
| 631 class FunctionDeclaration extends Statement { | |
| 632 final Identifier name; | |
| 633 final Fun function; | |
| 634 | |
| 635 FunctionDeclaration(this.name, this.function); | |
| 636 | |
| 637 accept(NodeVisitor visitor) => visitor.visitFunctionDeclaration(this); | |
| 638 | |
| 639 void visitChildren(NodeVisitor visitor) { | |
| 640 name.accept(visitor); | |
| 641 function.accept(visitor); | |
| 642 } | |
| 643 | |
| 644 FunctionDeclaration _clone() => new FunctionDeclaration(name, function); | |
| 645 } | |
| 646 | |
| 647 class LabeledStatement extends Statement { | |
| 648 final String label; | |
| 649 final Statement body; | |
| 650 | |
| 651 LabeledStatement(this.label, this.body); | |
| 652 | |
| 653 accept(NodeVisitor visitor) => visitor.visitLabeledStatement(this); | |
| 654 | |
| 655 void visitChildren(NodeVisitor visitor) { | |
| 656 body.accept(visitor); | |
| 657 } | |
| 658 | |
| 659 LabeledStatement _clone() => new LabeledStatement(label, body); | |
| 660 } | |
| 661 | |
| 662 class LiteralStatement extends Statement { | |
| 663 final String code; | |
| 664 | |
| 665 LiteralStatement(this.code); | |
| 666 | |
| 667 accept(NodeVisitor visitor) => visitor.visitLiteralStatement(this); | |
| 668 void visitChildren(NodeVisitor visitor) { } | |
| 669 | |
| 670 LiteralStatement _clone() => new LiteralStatement(code); | |
| 671 } | |
| 672 | |
| 673 // Not a real JavaScript node, but represents the yield statement from a dart | |
| 674 // program translated to JavaScript. | |
| 675 class DartYield extends Statement { | |
| 676 final Expression expression; | |
| 677 | |
| 678 final bool hasStar; | |
| 679 | |
| 680 DartYield(this.expression, this.hasStar); | |
| 681 | |
| 682 accept(NodeVisitor visitor) => visitor.visitDartYield(this); | |
| 683 | |
| 684 void visitChildren(NodeVisitor visitor) { | |
| 685 expression.accept(visitor); | |
| 686 } | |
| 687 | |
| 688 DartYield _clone() => new DartYield(expression, hasStar); | |
| 689 } | |
| 690 | |
| 691 abstract class Expression extends Node { | |
| 692 Expression(); | |
| 693 | |
| 694 factory Expression.binary(List<Expression> exprs, String op) { | |
| 695 Expression comma = null; | |
| 696 for (var node in exprs) { | |
| 697 comma = (comma == null) ? node : new Binary(op, comma, node); | |
| 698 } | |
| 699 return comma; | |
| 700 } | |
| 701 | |
| 702 int get precedenceLevel; | |
| 703 | |
| 704 Statement toStatement() => new ExpressionStatement(toVoidExpression()); | |
| 705 Statement toReturn() => new Return(this); | |
| 706 Statement toYieldStatement({bool star: false}) => | |
| 707 new ExpressionStatement(new Yield(this, star: star)); | |
| 708 | |
| 709 Expression toVoidExpression() => this; | |
| 710 Expression toAssignExpression(Expression left) => new Assignment(left, this); | |
| 711 Statement toVariableDeclaration(Identifier name) => | |
| 712 new VariableDeclarationList('let', | |
| 713 [new VariableInitialization(name, this)]).toStatement(); | |
| 714 } | |
| 715 | |
| 716 class LiteralExpression extends Expression { | |
| 717 final String template; | |
| 718 final List<Expression> inputs; | |
| 719 | |
| 720 LiteralExpression(this.template) : inputs = const []; | |
| 721 LiteralExpression.withData(this.template, this.inputs); | |
| 722 | |
| 723 accept(NodeVisitor visitor) => visitor.visitLiteralExpression(this); | |
| 724 | |
| 725 void visitChildren(NodeVisitor visitor) { | |
| 726 if (inputs != null) { | |
| 727 for (Expression expr in inputs) expr.accept(visitor); | |
| 728 } | |
| 729 } | |
| 730 | |
| 731 LiteralExpression _clone() => | |
| 732 new LiteralExpression.withData(template, inputs); | |
| 733 | |
| 734 // Code that uses JS must take care of operator precedences, and | |
| 735 // put parenthesis if needed. | |
| 736 int get precedenceLevel => PRIMARY; | |
| 737 } | |
| 738 | |
| 739 /** | |
| 740 * [VariableDeclarationList] is a subclass of [Expression] to simplify the | |
| 741 * AST. | |
| 742 */ | |
| 743 class VariableDeclarationList extends Expression { | |
| 744 /** The `var` or `let` keyword used for this variable declaration list. */ | |
| 745 final String keyword; | |
| 746 final List<VariableInitialization> declarations; | |
| 747 | |
| 748 VariableDeclarationList(this.keyword, this.declarations); | |
| 749 | |
| 750 accept(NodeVisitor visitor) => visitor.visitVariableDeclarationList(this); | |
| 751 | |
| 752 void visitChildren(NodeVisitor visitor) { | |
| 753 for (VariableInitialization declaration in declarations) { | |
| 754 declaration.accept(visitor); | |
| 755 } | |
| 756 } | |
| 757 | |
| 758 VariableDeclarationList _clone() => | |
| 759 new VariableDeclarationList(keyword, declarations); | |
| 760 | |
| 761 int get precedenceLevel => EXPRESSION; | |
| 762 } | |
| 763 | |
| 764 class Assignment extends Expression { | |
| 765 final Expression leftHandSide; | |
| 766 final String op; // Null, if the assignment is not compound. | |
| 767 final Expression value; // May be null, for [VariableInitialization]s. | |
| 768 | |
| 769 Assignment(leftHandSide, value) | |
| 770 : this.compound(leftHandSide, null, value); | |
| 771 Assignment.compound(this.leftHandSide, this.op, this.value); | |
| 772 | |
| 773 int get precedenceLevel => ASSIGNMENT; | |
| 774 | |
| 775 bool get isCompound => op != null; | |
| 776 | |
| 777 accept(NodeVisitor visitor) => visitor.visitAssignment(this); | |
| 778 | |
| 779 void visitChildren(NodeVisitor visitor) { | |
| 780 leftHandSide.accept(visitor); | |
| 781 if (value != null) value.accept(visitor); | |
| 782 } | |
| 783 | |
| 784 Assignment _clone() => | |
| 785 new Assignment.compound(leftHandSide, op, value); | |
| 786 } | |
| 787 | |
| 788 class VariableInitialization extends Assignment { | |
| 789 /** [value] may be null. */ | |
| 790 VariableInitialization(VariableBinding declaration, Expression value) | |
| 791 : super(declaration, value); | |
| 792 | |
| 793 VariableBinding get declaration => leftHandSide; | |
| 794 | |
| 795 accept(NodeVisitor visitor) => visitor.visitVariableInitialization(this); | |
| 796 | |
| 797 VariableInitialization _clone() => | |
| 798 new VariableInitialization(declaration, value); | |
| 799 } | |
| 800 | |
| 801 abstract class VariableBinding extends Expression { | |
| 802 } | |
| 803 | |
| 804 class DestructuredVariable extends Expression implements Parameter { | |
| 805 /// [LiteralString] or [Identifier]. | |
| 806 final Expression name; | |
| 807 final BindingPattern structure; | |
| 808 final Expression defaultValue; | |
| 809 final TypeRef type; | |
| 810 DestructuredVariable({this.name, this.structure, this.defaultValue, this.type}
) { | |
| 811 assert(name != null || structure != null); | |
| 812 } | |
| 813 | |
| 814 accept(NodeVisitor visitor) => visitor.visitDestructuredVariable(this); | |
| 815 void visitChildren(NodeVisitor visitor) { | |
| 816 name?.accept(visitor); | |
| 817 structure?.accept(visitor); | |
| 818 defaultValue?.accept(visitor); | |
| 819 } | |
| 820 | |
| 821 /// Avoid parenthesis when pretty-printing. | |
| 822 @override int get precedenceLevel => PRIMARY; | |
| 823 @override Node _clone() => | |
| 824 new DestructuredVariable( | |
| 825 name: name, structure: structure, defaultValue: defaultValue); | |
| 826 } | |
| 827 | |
| 828 abstract class BindingPattern extends Expression implements VariableBinding { | |
| 829 final List<DestructuredVariable> variables; | |
| 830 BindingPattern(this.variables); | |
| 831 | |
| 832 void visitChildren(NodeVisitor visitor) { | |
| 833 for (DestructuredVariable v in variables) v.accept(visitor); | |
| 834 } | |
| 835 } | |
| 836 | |
| 837 class SimpleBindingPattern extends BindingPattern { | |
| 838 final Identifier name; | |
| 839 SimpleBindingPattern(Identifier name) | |
| 840 : super([new DestructuredVariable(name: name)]), this.name = name; | |
| 841 accept(NodeVisitor visitor) => visitor.visitSimpleBindingPattern(this); | |
| 842 | |
| 843 /// Avoid parenthesis when pretty-printing. | |
| 844 @override int get precedenceLevel => PRIMARY; | |
| 845 @override Node _clone() => new SimpleBindingPattern(name); | |
| 846 } | |
| 847 | |
| 848 class ObjectBindingPattern extends BindingPattern { | |
| 849 ObjectBindingPattern(List<DestructuredVariable> variables) | |
| 850 : super(variables); | |
| 851 accept(NodeVisitor visitor) => visitor.visitObjectBindingPattern(this); | |
| 852 | |
| 853 /// Avoid parenthesis when pretty-printing. | |
| 854 @override int get precedenceLevel => PRIMARY; | |
| 855 @override Node _clone() => new ObjectBindingPattern(variables); | |
| 856 } | |
| 857 | |
| 858 class ArrayBindingPattern extends BindingPattern { | |
| 859 ArrayBindingPattern(List<DestructuredVariable> variables) | |
| 860 : super(variables); | |
| 861 accept(NodeVisitor visitor) => visitor.visitArrayBindingPattern(this); | |
| 862 | |
| 863 /// Avoid parenthesis when pretty-printing. | |
| 864 @override int get precedenceLevel => PRIMARY; | |
| 865 @override Node _clone() => new ObjectBindingPattern(variables); | |
| 866 } | |
| 867 | |
| 868 class Conditional extends Expression { | |
| 869 final Expression condition; | |
| 870 final Expression then; | |
| 871 final Expression otherwise; | |
| 872 | |
| 873 Conditional(this.condition, this.then, this.otherwise); | |
| 874 | |
| 875 accept(NodeVisitor visitor) => visitor.visitConditional(this); | |
| 876 | |
| 877 void visitChildren(NodeVisitor visitor) { | |
| 878 condition.accept(visitor); | |
| 879 then.accept(visitor); | |
| 880 otherwise.accept(visitor); | |
| 881 } | |
| 882 | |
| 883 Conditional _clone() => new Conditional(condition, then, otherwise); | |
| 884 | |
| 885 int get precedenceLevel => ASSIGNMENT; | |
| 886 } | |
| 887 | |
| 888 class Call extends Expression { | |
| 889 Expression target; | |
| 890 List<Expression> arguments; | |
| 891 | |
| 892 Call(this.target, this.arguments); | |
| 893 | |
| 894 accept(NodeVisitor visitor) => visitor.visitCall(this); | |
| 895 | |
| 896 void visitChildren(NodeVisitor visitor) { | |
| 897 target.accept(visitor); | |
| 898 for (Expression arg in arguments) arg.accept(visitor); | |
| 899 } | |
| 900 | |
| 901 Call _clone() => new Call(target, arguments); | |
| 902 | |
| 903 int get precedenceLevel => CALL; | |
| 904 } | |
| 905 | |
| 906 class New extends Call { | |
| 907 New(Expression cls, List<Expression> arguments) : super(cls, arguments); | |
| 908 | |
| 909 accept(NodeVisitor visitor) => visitor.visitNew(this); | |
| 910 | |
| 911 New _clone() => new New(target, arguments); | |
| 912 | |
| 913 int get precedenceLevel => ACCESS; | |
| 914 } | |
| 915 | |
| 916 class Binary extends Expression { | |
| 917 final String op; | |
| 918 final Expression left; | |
| 919 final Expression right; | |
| 920 | |
| 921 Binary(this.op, this.left, this.right); | |
| 922 | |
| 923 accept(NodeVisitor visitor) => visitor.visitBinary(this); | |
| 924 | |
| 925 Binary _clone() => new Binary(op, left, right); | |
| 926 | |
| 927 void visitChildren(NodeVisitor visitor) { | |
| 928 left.accept(visitor); | |
| 929 right.accept(visitor); | |
| 930 } | |
| 931 | |
| 932 bool get isCommaOperator => op == ','; | |
| 933 | |
| 934 Expression toVoidExpression() { | |
| 935 if (!isCommaOperator) return super.toVoidExpression(); | |
| 936 var l = left.toVoidExpression(); | |
| 937 var r = right.toVoidExpression(); | |
| 938 if (l == left && r == right) return this; | |
| 939 return new Binary(',', l, r); | |
| 940 } | |
| 941 | |
| 942 Statement toStatement() { | |
| 943 if (!isCommaOperator) return super.toStatement(); | |
| 944 return new Block([left.toStatement(), right.toStatement()]); | |
| 945 } | |
| 946 | |
| 947 Statement toReturn() { | |
| 948 if (!isCommaOperator) return super.toReturn(); | |
| 949 return new Block([left.toStatement(), right.toReturn()]); | |
| 950 } | |
| 951 | |
| 952 Statement toYieldStatement({bool star: false}) { | |
| 953 if (!isCommaOperator) return super.toYieldStatement(star: star); | |
| 954 return new Block([left.toStatement(), right.toYieldStatement(star: star)]); | |
| 955 } | |
| 956 | |
| 957 List<Expression> commaToExpressionList() { | |
| 958 if (!isCommaOperator) throw new StateError('not a comma expression'); | |
| 959 var exprs = []; | |
| 960 _flattenComma(exprs, left); | |
| 961 _flattenComma(exprs, right); | |
| 962 return exprs; | |
| 963 } | |
| 964 | |
| 965 static void _flattenComma(List<Expression> exprs, Expression node) { | |
| 966 if (node is Binary && node.isCommaOperator) { | |
| 967 _flattenComma(exprs, node.left); | |
| 968 _flattenComma(exprs, node.right); | |
| 969 } else { | |
| 970 exprs.add(node); | |
| 971 } | |
| 972 } | |
| 973 | |
| 974 int get precedenceLevel { | |
| 975 // TODO(floitsch): switch to constant map. | |
| 976 switch (op) { | |
| 977 case "*": | |
| 978 case "/": | |
| 979 case "%": | |
| 980 return MULTIPLICATIVE; | |
| 981 case "+": | |
| 982 case "-": | |
| 983 return ADDITIVE; | |
| 984 case "<<": | |
| 985 case ">>": | |
| 986 case ">>>": | |
| 987 return SHIFT; | |
| 988 case "<": | |
| 989 case ">": | |
| 990 case "<=": | |
| 991 case ">=": | |
| 992 case "instanceof": | |
| 993 case "in": | |
| 994 return RELATIONAL; | |
| 995 case "==": | |
| 996 case "===": | |
| 997 case "!=": | |
| 998 case "!==": | |
| 999 return EQUALITY; | |
| 1000 case "&": | |
| 1001 return BIT_AND; | |
| 1002 case "^": | |
| 1003 return BIT_XOR; | |
| 1004 case "|": | |
| 1005 return BIT_OR; | |
| 1006 case "&&": | |
| 1007 return LOGICAL_AND; | |
| 1008 case "||": | |
| 1009 return LOGICAL_OR; | |
| 1010 case ',': | |
| 1011 return EXPRESSION; | |
| 1012 default: | |
| 1013 throw "Internal Error: Unhandled binary operator: $op"; | |
| 1014 } | |
| 1015 } | |
| 1016 } | |
| 1017 | |
| 1018 class Prefix extends Expression { | |
| 1019 final String op; | |
| 1020 final Expression argument; | |
| 1021 | |
| 1022 Prefix(this.op, this.argument); | |
| 1023 | |
| 1024 accept(NodeVisitor visitor) => visitor.visitPrefix(this); | |
| 1025 | |
| 1026 Prefix _clone() => new Prefix(op, argument); | |
| 1027 | |
| 1028 void visitChildren(NodeVisitor visitor) { | |
| 1029 argument.accept(visitor); | |
| 1030 } | |
| 1031 | |
| 1032 int get precedenceLevel => UNARY; | |
| 1033 } | |
| 1034 | |
| 1035 // SpreadElement isn't really a prefix expression, as it can only appear in | |
| 1036 // certain places such as ArgumentList and BindingPattern, but we pretend | |
| 1037 // it is for simplicity's sake. | |
| 1038 class Spread extends Prefix { | |
| 1039 Spread(Expression operand) : super('...', operand); | |
| 1040 int get precedenceLevel => SPREAD; | |
| 1041 | |
| 1042 accept(NodeVisitor visitor) => visitor.visitSpread(this); | |
| 1043 Spread _clone() => new Spread(argument); | |
| 1044 } | |
| 1045 | |
| 1046 class Postfix extends Expression { | |
| 1047 final String op; | |
| 1048 final Expression argument; | |
| 1049 | |
| 1050 Postfix(this.op, this.argument); | |
| 1051 | |
| 1052 accept(NodeVisitor visitor) => visitor.visitPostfix(this); | |
| 1053 | |
| 1054 Postfix _clone() => new Postfix(op, argument); | |
| 1055 | |
| 1056 void visitChildren(NodeVisitor visitor) { | |
| 1057 argument.accept(visitor); | |
| 1058 } | |
| 1059 | |
| 1060 int get precedenceLevel => UNARY; | |
| 1061 } | |
| 1062 | |
| 1063 abstract class Parameter implements Expression, VariableBinding { | |
| 1064 TypeRef get type; | |
| 1065 } | |
| 1066 | |
| 1067 class Identifier extends Expression implements Parameter, VariableBinding { | |
| 1068 final String name; | |
| 1069 final bool allowRename; | |
| 1070 final TypeRef type; | |
| 1071 | |
| 1072 Identifier(this.name, {this.allowRename: true, this.type}) { | |
| 1073 if (!_identifierRE.hasMatch(name)) { | |
| 1074 throw new ArgumentError.value(name, "name", "not a valid identifier"); | |
| 1075 } | |
| 1076 } | |
| 1077 static RegExp _identifierRE = new RegExp(r'^[A-Za-z_$][A-Za-z_$0-9]*$'); | |
| 1078 | |
| 1079 Identifier _clone() => | |
| 1080 new Identifier(name, allowRename: allowRename); | |
| 1081 accept(NodeVisitor visitor) => visitor.visitIdentifier(this); | |
| 1082 int get precedenceLevel => PRIMARY; | |
| 1083 void visitChildren(NodeVisitor visitor) {} | |
| 1084 } | |
| 1085 | |
| 1086 // This is an expression for convenience in the AST. | |
| 1087 class RestParameter extends Expression implements Parameter { | |
| 1088 final Identifier parameter; | |
| 1089 TypeRef get type => null; | |
| 1090 | |
| 1091 RestParameter(this.parameter); | |
| 1092 | |
| 1093 RestParameter _clone() => new RestParameter(parameter); | |
| 1094 accept(NodeVisitor visitor) => visitor.visitRestParameter(this); | |
| 1095 void visitChildren(NodeVisitor visitor) { | |
| 1096 parameter.accept(visitor); | |
| 1097 } | |
| 1098 int get precedenceLevel => PRIMARY; | |
| 1099 } | |
| 1100 | |
| 1101 class This extends Expression { | |
| 1102 accept(NodeVisitor visitor) => visitor.visitThis(this); | |
| 1103 This _clone() => new This(); | |
| 1104 int get precedenceLevel => PRIMARY; | |
| 1105 void visitChildren(NodeVisitor visitor) {} | |
| 1106 | |
| 1107 static bool foundIn(Node node) { | |
| 1108 _thisFinder.found = false; | |
| 1109 node.accept(_thisFinder); | |
| 1110 return _thisFinder.found; | |
| 1111 } | |
| 1112 } | |
| 1113 | |
| 1114 final _thisFinder = new _ThisFinder(); | |
| 1115 class _ThisFinder extends BaseVisitor { | |
| 1116 bool found = false; | |
| 1117 visitThis(This node) { | |
| 1118 found = true; | |
| 1119 } | |
| 1120 visitNode(Node node) { | |
| 1121 if (!found) super.visitNode(node); | |
| 1122 } | |
| 1123 } | |
| 1124 | |
| 1125 | |
| 1126 // `super` is more restricted in the ES6 spec, but for simplicity we accept | |
| 1127 // it anywhere that `this` is accepted. | |
| 1128 class Super extends Expression { | |
| 1129 accept(NodeVisitor visitor) => visitor.visitSuper(this); | |
| 1130 Super _clone() => new Super(); | |
| 1131 int get precedenceLevel => PRIMARY; | |
| 1132 void visitChildren(NodeVisitor visitor) {} | |
| 1133 } | |
| 1134 | |
| 1135 class NamedFunction extends Expression { | |
| 1136 final Identifier name; | |
| 1137 final Fun function; | |
| 1138 | |
| 1139 NamedFunction(this.name, this.function); | |
| 1140 | |
| 1141 accept(NodeVisitor visitor) => visitor.visitNamedFunction(this); | |
| 1142 | |
| 1143 void visitChildren(NodeVisitor visitor) { | |
| 1144 name.accept(visitor); | |
| 1145 function.accept(visitor); | |
| 1146 } | |
| 1147 NamedFunction _clone() => new NamedFunction(name, function); | |
| 1148 | |
| 1149 int get precedenceLevel => PRIMARY_LOW_PRECEDENCE; | |
| 1150 } | |
| 1151 | |
| 1152 abstract class FunctionExpression extends Expression { | |
| 1153 List<Parameter> get params; | |
| 1154 | |
| 1155 get body; // Expression or block | |
| 1156 /// Type parameters passed to this generic function, if any. `null` otherwise. | |
| 1157 // TODO(ochafik): Support type bounds. | |
| 1158 List<Identifier> get typeParams; | |
| 1159 /// Return type of this function, if any. `null` otherwise. | |
| 1160 TypeRef get returnType; | |
| 1161 } | |
| 1162 | |
| 1163 class Fun extends FunctionExpression { | |
| 1164 final List<Parameter> params; | |
| 1165 final Block body; | |
| 1166 @override final List<Identifier> typeParams; | |
| 1167 @override final TypeRef returnType; | |
| 1168 /** Whether this is a JS generator (`function*`) that may contain `yield`. */ | |
| 1169 final bool isGenerator; | |
| 1170 | |
| 1171 final AsyncModifier asyncModifier; | |
| 1172 | |
| 1173 Fun(this.params, this.body, {this.isGenerator: false, | |
| 1174 this.asyncModifier: const AsyncModifier.sync(), | |
| 1175 this.typeParams, this.returnType}); | |
| 1176 | |
| 1177 accept(NodeVisitor visitor) => visitor.visitFun(this); | |
| 1178 | |
| 1179 void visitChildren(NodeVisitor visitor) { | |
| 1180 for (Parameter param in params) param.accept(visitor); | |
| 1181 body.accept(visitor); | |
| 1182 } | |
| 1183 | |
| 1184 Fun _clone() => new Fun(params, body, | |
| 1185 isGenerator: isGenerator, asyncModifier: asyncModifier); | |
| 1186 | |
| 1187 int get precedenceLevel => PRIMARY_LOW_PRECEDENCE; | |
| 1188 } | |
| 1189 | |
| 1190 class ArrowFun extends FunctionExpression { | |
| 1191 final List<Parameter> params; | |
| 1192 final body; // Expression or Block | |
| 1193 @override final List<Identifier> typeParams; | |
| 1194 @override final TypeRef returnType; | |
| 1195 | |
| 1196 ArrowFun(this.params, this.body, {this.typeParams, this.returnType}); | |
| 1197 | |
| 1198 accept(NodeVisitor visitor) => visitor.visitArrowFun(this); | |
| 1199 | |
| 1200 void visitChildren(NodeVisitor visitor) { | |
| 1201 for (Parameter param in params) param.accept(visitor); | |
| 1202 body.accept(visitor); | |
| 1203 } | |
| 1204 | |
| 1205 int get precedenceLevel => PRIMARY_LOW_PRECEDENCE; | |
| 1206 | |
| 1207 ArrowFun _clone() => new ArrowFun(params, body); | |
| 1208 } | |
| 1209 | |
| 1210 /** | |
| 1211 * The Dart sync, sync*, async, and async* modifier. | |
| 1212 * See [DartYield]. | |
| 1213 * | |
| 1214 * This is not used for JS functions. | |
| 1215 */ | |
| 1216 class AsyncModifier { | |
| 1217 final bool isAsync; | |
| 1218 final bool isYielding; | |
| 1219 final String description; | |
| 1220 | |
| 1221 const AsyncModifier.sync() | |
| 1222 : isAsync = false, | |
| 1223 isYielding = false, | |
| 1224 description = "sync"; | |
| 1225 const AsyncModifier.async() | |
| 1226 : isAsync = true, | |
| 1227 isYielding = false, | |
| 1228 description = "async"; | |
| 1229 const AsyncModifier.asyncStar() | |
| 1230 : isAsync = true, | |
| 1231 isYielding = true, | |
| 1232 description = "async*"; | |
| 1233 const AsyncModifier.syncStar() | |
| 1234 : isAsync = false, | |
| 1235 isYielding = true, | |
| 1236 description = "sync*"; | |
| 1237 toString() => description; | |
| 1238 } | |
| 1239 | |
| 1240 class PropertyAccess extends Expression { | |
| 1241 final Expression receiver; | |
| 1242 final Expression selector; | |
| 1243 | |
| 1244 PropertyAccess(this.receiver, this.selector); | |
| 1245 PropertyAccess.field(this.receiver, String fieldName) | |
| 1246 : selector = new LiteralString('"$fieldName"'); | |
| 1247 PropertyAccess.indexed(this.receiver, int index) | |
| 1248 : selector = new LiteralNumber('$index'); | |
| 1249 | |
| 1250 accept(NodeVisitor visitor) => visitor.visitAccess(this); | |
| 1251 | |
| 1252 void visitChildren(NodeVisitor visitor) { | |
| 1253 receiver.accept(visitor); | |
| 1254 selector.accept(visitor); | |
| 1255 } | |
| 1256 | |
| 1257 PropertyAccess _clone() => new PropertyAccess(receiver, selector); | |
| 1258 | |
| 1259 int get precedenceLevel => ACCESS; | |
| 1260 } | |
| 1261 | |
| 1262 abstract class Literal extends Expression { | |
| 1263 void visitChildren(NodeVisitor visitor) {} | |
| 1264 | |
| 1265 int get precedenceLevel => PRIMARY; | |
| 1266 } | |
| 1267 | |
| 1268 class LiteralBool extends Literal { | |
| 1269 final bool value; | |
| 1270 | |
| 1271 LiteralBool(this.value); | |
| 1272 | |
| 1273 accept(NodeVisitor visitor) => visitor.visitLiteralBool(this); | |
| 1274 // [visitChildren] inherited from [Literal]. | |
| 1275 LiteralBool _clone() => new LiteralBool(value); | |
| 1276 } | |
| 1277 | |
| 1278 class LiteralNull extends Literal { | |
| 1279 LiteralNull(); | |
| 1280 | |
| 1281 accept(NodeVisitor visitor) => visitor.visitLiteralNull(this); | |
| 1282 LiteralNull _clone() => new LiteralNull(); | |
| 1283 } | |
| 1284 | |
| 1285 class LiteralString extends Literal { | |
| 1286 final String value; | |
| 1287 | |
| 1288 /** | |
| 1289 * Constructs a LiteralString from a string value. | |
| 1290 * | |
| 1291 * The constructor does not add the required quotes. If [value] is not | |
| 1292 * surrounded by quotes and property escaped, the resulting object is invalid | |
| 1293 * as a JS value. | |
| 1294 * | |
| 1295 * TODO(sra): Introduce variants for known valid strings that don't allocate a | |
| 1296 * new string just to add quotes. | |
| 1297 */ | |
| 1298 LiteralString(this.value); | |
| 1299 | |
| 1300 /// Gets the value inside the string without the beginning and end quotes. | |
| 1301 String get valueWithoutQuotes => value.substring(1, value.length - 1); | |
| 1302 | |
| 1303 accept(NodeVisitor visitor) => visitor.visitLiteralString(this); | |
| 1304 LiteralString _clone() => new LiteralString(value); | |
| 1305 } | |
| 1306 | |
| 1307 class LiteralNumber extends Literal { | |
| 1308 final String value; // Must be a valid JavaScript number literal. | |
| 1309 | |
| 1310 LiteralNumber(this.value); | |
| 1311 | |
| 1312 accept(NodeVisitor visitor) => visitor.visitLiteralNumber(this); | |
| 1313 LiteralNumber _clone() => new LiteralNumber(value); | |
| 1314 | |
| 1315 /** | |
| 1316 * Use a different precedence level depending on whether the value contains a | |
| 1317 * dot to ensure we generate `(1).toString()` and `1.0.toString()`. | |
| 1318 */ | |
| 1319 int get precedenceLevel => value.contains('.') ? PRIMARY : UNARY; | |
| 1320 } | |
| 1321 | |
| 1322 class ArrayInitializer extends Expression { | |
| 1323 final List<Expression> elements; | |
| 1324 final bool multiline; | |
| 1325 | |
| 1326 ArrayInitializer(this.elements, {this.multiline: false}); | |
| 1327 | |
| 1328 accept(NodeVisitor visitor) => visitor.visitArrayInitializer(this); | |
| 1329 | |
| 1330 void visitChildren(NodeVisitor visitor) { | |
| 1331 for (Expression element in elements) element.accept(visitor); | |
| 1332 } | |
| 1333 | |
| 1334 ArrayInitializer _clone() => new ArrayInitializer(elements); | |
| 1335 | |
| 1336 int get precedenceLevel => PRIMARY; | |
| 1337 } | |
| 1338 | |
| 1339 /** | |
| 1340 * An empty place in an [ArrayInitializer]. | |
| 1341 * For example the list [1, , , 2] would contain two holes. | |
| 1342 */ | |
| 1343 class ArrayHole extends Expression { | |
| 1344 accept(NodeVisitor visitor) => visitor.visitArrayHole(this); | |
| 1345 | |
| 1346 void visitChildren(NodeVisitor visitor) {} | |
| 1347 | |
| 1348 ArrayHole _clone() => new ArrayHole(); | |
| 1349 | |
| 1350 int get precedenceLevel => PRIMARY; | |
| 1351 } | |
| 1352 | |
| 1353 class ObjectInitializer extends Expression { | |
| 1354 final List<Property> properties; | |
| 1355 final bool _multiline; | |
| 1356 | |
| 1357 /** | |
| 1358 * Constructs a new object-initializer containing the given [properties]. | |
| 1359 */ | |
| 1360 ObjectInitializer(this.properties, {multiline: false}) | |
| 1361 : _multiline = multiline; | |
| 1362 | |
| 1363 accept(NodeVisitor visitor) => visitor.visitObjectInitializer(this); | |
| 1364 | |
| 1365 void visitChildren(NodeVisitor visitor) { | |
| 1366 for (Property init in properties) init.accept(visitor); | |
| 1367 } | |
| 1368 | |
| 1369 ObjectInitializer _clone() => new ObjectInitializer(properties); | |
| 1370 | |
| 1371 int get precedenceLevel => PRIMARY; | |
| 1372 /** | |
| 1373 * If set to true, forces a vertical layout when using the [Printer]. | |
| 1374 * Otherwise, layout will be vertical if and only if any [properties] | |
| 1375 * are [FunctionExpression]s. | |
| 1376 */ | |
| 1377 bool get multiline { | |
| 1378 return _multiline || properties.any((p) => p.value is FunctionExpression); | |
| 1379 } | |
| 1380 } | |
| 1381 | |
| 1382 class Property extends Node { | |
| 1383 final Expression name; | |
| 1384 final Expression value; | |
| 1385 | |
| 1386 Property(this.name, this.value); | |
| 1387 | |
| 1388 accept(NodeVisitor visitor) => visitor.visitProperty(this); | |
| 1389 | |
| 1390 void visitChildren(NodeVisitor visitor) { | |
| 1391 name.accept(visitor); | |
| 1392 value.accept(visitor); | |
| 1393 } | |
| 1394 | |
| 1395 Property _clone() => new Property(name, value); | |
| 1396 } | |
| 1397 | |
| 1398 // TODO(jmesserly): parser does not support this yet. | |
| 1399 class TemplateString extends Expression { | |
| 1400 /** | |
| 1401 * The parts of this template string: a sequence of [String]s and | |
| 1402 * [Expression]s. Strings and expressions will alternate, for example: | |
| 1403 * | |
| 1404 * `foo${1 + 2} bar ${'hi'}` | |
| 1405 * | |
| 1406 * would be represented by: | |
| 1407 * | |
| 1408 * ['foo', new JS.Binary('+', js.number(1), js.number(2)), | |
| 1409 * ' bar ', new JS.LiteralString("'hi'")] | |
| 1410 */ | |
| 1411 final List elements; | |
| 1412 TemplateString(this.elements); | |
| 1413 | |
| 1414 accept(NodeVisitor visitor) => visitor.visitTemplateString(this); | |
| 1415 | |
| 1416 void visitChildren(NodeVisitor visitor) { | |
| 1417 for (var element in elements) { | |
| 1418 if (element is Expression) element.accept(visitor); | |
| 1419 } | |
| 1420 } | |
| 1421 | |
| 1422 TemplateString _clone() => new TemplateString(elements); | |
| 1423 | |
| 1424 int get precedenceLevel => PRIMARY; | |
| 1425 } | |
| 1426 | |
| 1427 // TODO(jmesserly): parser does not support this yet. | |
| 1428 class TaggedTemplate extends Expression { | |
| 1429 final Expression tag; | |
| 1430 final TemplateString template; | |
| 1431 | |
| 1432 TaggedTemplate(this.tag, this.template); | |
| 1433 | |
| 1434 accept(NodeVisitor visitor) => visitor.visitTaggedTemplate(this); | |
| 1435 | |
| 1436 void visitChildren(NodeVisitor visitor) { | |
| 1437 tag.accept(visitor); | |
| 1438 template.accept(visitor); | |
| 1439 } | |
| 1440 | |
| 1441 TaggedTemplate _clone() => new TaggedTemplate(tag, template); | |
| 1442 | |
| 1443 int get precedenceLevel => CALL; | |
| 1444 } | |
| 1445 | |
| 1446 // TODO(jmesserly): parser does not support this yet. | |
| 1447 class Yield extends Expression { | |
| 1448 final Expression value; // Can be null. | |
| 1449 | |
| 1450 /** | |
| 1451 * Whether this yield expression is a `yield*` that iterates each item in | |
| 1452 * [value]. | |
| 1453 */ | |
| 1454 final bool star; | |
| 1455 | |
| 1456 Yield(this.value, {this.star: false}); | |
| 1457 | |
| 1458 accept(NodeVisitor visitor) => visitor.visitYield(this); | |
| 1459 | |
| 1460 void visitChildren(NodeVisitor visitor) { | |
| 1461 if (value != null) value.accept(visitor); | |
| 1462 } | |
| 1463 | |
| 1464 Yield _clone() => new Yield(value); | |
| 1465 | |
| 1466 int get precedenceLevel => YIELD; | |
| 1467 } | |
| 1468 | |
| 1469 class ClassDeclaration extends Statement { | |
| 1470 final ClassExpression classExpr; | |
| 1471 | |
| 1472 ClassDeclaration(this.classExpr); | |
| 1473 | |
| 1474 accept(NodeVisitor visitor) => visitor.visitClassDeclaration(this); | |
| 1475 visitChildren(NodeVisitor visitor) => classExpr.accept(visitor); | |
| 1476 ClassDeclaration _clone() => new ClassDeclaration(classExpr); | |
| 1477 } | |
| 1478 | |
| 1479 class ClassExpression extends Expression { | |
| 1480 final Identifier name; | |
| 1481 final Expression heritage; // Can be null. | |
| 1482 final List<Method> methods; | |
| 1483 /// Type parameters of this class, if any. `null` otherwise. | |
| 1484 // TODO(ochafik): Support type bounds. | |
| 1485 final List<Identifier> typeParams; | |
| 1486 /// Field declarations of this class (TypeScript / ES6_TYPED). | |
| 1487 final List<VariableDeclarationList> fields; | |
| 1488 | |
| 1489 ClassExpression(this.name, this.heritage, this.methods, | |
| 1490 {this.typeParams, this.fields}); | |
| 1491 | |
| 1492 accept(NodeVisitor visitor) => visitor.visitClassExpression(this); | |
| 1493 | |
| 1494 void visitChildren(NodeVisitor visitor) { | |
| 1495 name.accept(visitor); | |
| 1496 if (heritage != null) heritage.accept(visitor); | |
| 1497 for (Method element in methods) element.accept(visitor); | |
| 1498 if (fields != null) { | |
| 1499 for (var field in fields) { | |
| 1500 field.accept(visitor); | |
| 1501 } | |
| 1502 } | |
| 1503 if (typeParams != null) { | |
| 1504 for (var typeParam in typeParams) { | |
| 1505 typeParam.accept(visitor); | |
| 1506 } | |
| 1507 } | |
| 1508 } | |
| 1509 | |
| 1510 ClassExpression _clone() => new ClassExpression( | |
| 1511 name, heritage, methods, typeParams: typeParams, fields: fields); | |
| 1512 | |
| 1513 int get precedenceLevel => PRIMARY_LOW_PRECEDENCE; | |
| 1514 } | |
| 1515 | |
| 1516 class Method extends Property { | |
| 1517 final bool isGetter; | |
| 1518 final bool isSetter; | |
| 1519 final bool isStatic; | |
| 1520 | |
| 1521 Method(Expression name, Fun function, | |
| 1522 {this.isGetter: false, this.isSetter: false, this.isStatic: false}) | |
| 1523 : super(name, function) { | |
| 1524 assert(!isGetter || function.params.length == 0); | |
| 1525 assert(!isSetter || function.params.length == 1); | |
| 1526 assert(!isGetter && !isSetter || !function.isGenerator); | |
| 1527 } | |
| 1528 | |
| 1529 Fun get function => super.value; | |
| 1530 | |
| 1531 accept(NodeVisitor visitor) => visitor.visitMethod(this); | |
| 1532 | |
| 1533 void visitChildren(NodeVisitor visitor) { | |
| 1534 name.accept(visitor); | |
| 1535 function.accept(visitor); | |
| 1536 } | |
| 1537 | |
| 1538 Method _clone() => new Method(name, function, | |
| 1539 isGetter: isGetter, isSetter: isSetter, isStatic: isStatic); | |
| 1540 } | |
| 1541 | |
| 1542 /// Tag class for all interpolated positions. | |
| 1543 abstract class InterpolatedNode implements Node { | |
| 1544 get nameOrPosition; | |
| 1545 | |
| 1546 bool get isNamed => nameOrPosition is String; | |
| 1547 bool get isPositional => nameOrPosition is int; | |
| 1548 } | |
| 1549 | |
| 1550 class InterpolatedExpression extends Expression with InterpolatedNode { | |
| 1551 final nameOrPosition; | |
| 1552 | |
| 1553 InterpolatedExpression(this.nameOrPosition); | |
| 1554 | |
| 1555 accept(NodeVisitor visitor) => visitor.visitInterpolatedExpression(this); | |
| 1556 void visitChildren(NodeVisitor visitor) {} | |
| 1557 InterpolatedExpression _clone() => | |
| 1558 new InterpolatedExpression(nameOrPosition); | |
| 1559 | |
| 1560 int get precedenceLevel => PRIMARY; | |
| 1561 } | |
| 1562 | |
| 1563 class InterpolatedLiteral extends Literal with InterpolatedNode { | |
| 1564 final nameOrPosition; | |
| 1565 | |
| 1566 InterpolatedLiteral(this.nameOrPosition); | |
| 1567 | |
| 1568 accept(NodeVisitor visitor) => visitor.visitInterpolatedLiteral(this); | |
| 1569 void visitChildren(NodeVisitor visitor) {} | |
| 1570 InterpolatedLiteral _clone() => new InterpolatedLiteral(nameOrPosition); | |
| 1571 } | |
| 1572 | |
| 1573 class InterpolatedParameter extends Expression with InterpolatedNode | |
| 1574 implements Identifier { | |
| 1575 final nameOrPosition; | |
| 1576 TypeRef get type => null; | |
| 1577 | |
| 1578 String get name { throw "InterpolatedParameter.name must not be invoked"; } | |
| 1579 bool get allowRename => false; | |
| 1580 | |
| 1581 InterpolatedParameter(this.nameOrPosition); | |
| 1582 | |
| 1583 accept(NodeVisitor visitor) => visitor.visitInterpolatedParameter(this); | |
| 1584 void visitChildren(NodeVisitor visitor) {} | |
| 1585 InterpolatedParameter _clone() => new InterpolatedParameter(nameOrPosition); | |
| 1586 | |
| 1587 int get precedenceLevel => PRIMARY; | |
| 1588 } | |
| 1589 | |
| 1590 class InterpolatedSelector extends Expression with InterpolatedNode { | |
| 1591 final nameOrPosition; | |
| 1592 | |
| 1593 InterpolatedSelector(this.nameOrPosition); | |
| 1594 | |
| 1595 accept(NodeVisitor visitor) => visitor.visitInterpolatedSelector(this); | |
| 1596 void visitChildren(NodeVisitor visitor) {} | |
| 1597 InterpolatedSelector _clone() => new InterpolatedSelector(nameOrPosition); | |
| 1598 | |
| 1599 int get precedenceLevel => PRIMARY; | |
| 1600 } | |
| 1601 | |
| 1602 class InterpolatedStatement extends Statement with InterpolatedNode { | |
| 1603 final nameOrPosition; | |
| 1604 | |
| 1605 InterpolatedStatement(this.nameOrPosition); | |
| 1606 | |
| 1607 accept(NodeVisitor visitor) => visitor.visitInterpolatedStatement(this); | |
| 1608 void visitChildren(NodeVisitor visitor) {} | |
| 1609 InterpolatedStatement _clone() => new InterpolatedStatement(nameOrPosition); | |
| 1610 } | |
| 1611 | |
| 1612 // TODO(jmesserly): generalize this to InterpolatedProperty? | |
| 1613 class InterpolatedMethod extends Expression with InterpolatedNode | |
| 1614 implements Method { | |
| 1615 final nameOrPosition; | |
| 1616 | |
| 1617 InterpolatedMethod(this.nameOrPosition); | |
| 1618 | |
| 1619 accept(NodeVisitor visitor) => visitor.visitInterpolatedMethod(this); | |
| 1620 void visitChildren(NodeVisitor visitor) {} | |
| 1621 InterpolatedMethod _clone() => new InterpolatedMethod(nameOrPosition); | |
| 1622 | |
| 1623 int get precedenceLevel => PRIMARY; | |
| 1624 Expression get name => _unsupported; | |
| 1625 Expression get value => _unsupported; | |
| 1626 bool get isGetter => _unsupported; | |
| 1627 bool get isSetter => _unsupported; | |
| 1628 bool get isStatic => _unsupported; | |
| 1629 Fun get function => _unsupported; | |
| 1630 get _unsupported => throw '$runtimeType does not support this member.'; | |
| 1631 } | |
| 1632 | |
| 1633 class InterpolatedIdentifier extends Expression with InterpolatedNode | |
| 1634 implements Identifier { | |
| 1635 final nameOrPosition; | |
| 1636 TypeRef get type => null; | |
| 1637 | |
| 1638 InterpolatedIdentifier(this.nameOrPosition); | |
| 1639 | |
| 1640 accept(NodeVisitor visitor) => | |
| 1641 visitor.visitInterpolatedIdentifier(this); | |
| 1642 void visitChildren(NodeVisitor visitor) {} | |
| 1643 InterpolatedIdentifier _clone() => new InterpolatedIdentifier(nameOrPosition); | |
| 1644 | |
| 1645 int get precedenceLevel => PRIMARY; | |
| 1646 String get name => throw '$runtimeType does not support this member.'; | |
| 1647 bool get allowRename => false; | |
| 1648 } | |
| 1649 | |
| 1650 /** | |
| 1651 * [RegExpLiteral]s, despite being called "Literal", do not inherit from | |
| 1652 * [Literal]. Indeed, regular expressions in JavaScript have a side-effect and | |
| 1653 * are thus not in the same category as numbers or strings. | |
| 1654 */ | |
| 1655 class RegExpLiteral extends Expression { | |
| 1656 /** Contains the pattern and the flags.*/ | |
| 1657 final String pattern; | |
| 1658 | |
| 1659 RegExpLiteral(this.pattern); | |
| 1660 | |
| 1661 accept(NodeVisitor visitor) => visitor.visitRegExpLiteral(this); | |
| 1662 void visitChildren(NodeVisitor visitor) {} | |
| 1663 RegExpLiteral _clone() => new RegExpLiteral(pattern); | |
| 1664 | |
| 1665 int get precedenceLevel => PRIMARY; | |
| 1666 } | |
| 1667 | |
| 1668 /** | |
| 1669 * An asynchronous await. | |
| 1670 * | |
| 1671 * Not part of JavaScript. We desugar this expression before outputting. | |
| 1672 * Should only occur in a [Fun] with `asyncModifier` async or asyncStar. | |
| 1673 */ | |
| 1674 class Await extends Expression { | |
| 1675 /** The awaited expression. */ | |
| 1676 final Expression expression; | |
| 1677 | |
| 1678 Await(this.expression); | |
| 1679 | |
| 1680 int get precedenceLevel => UNARY; | |
| 1681 accept(NodeVisitor visitor) => visitor.visitAwait(this); | |
| 1682 void visitChildren(NodeVisitor visitor) => expression.accept(visitor); | |
| 1683 Await _clone() => new Await(expression); | |
| 1684 } | |
| 1685 | |
| 1686 /** | |
| 1687 * A comment. | |
| 1688 * | |
| 1689 * Extends [Statement] so we can add comments before statements in | |
| 1690 * [Block] and [Program]. | |
| 1691 */ | |
| 1692 class Comment extends Statement { | |
| 1693 final String comment; | |
| 1694 | |
| 1695 Comment(this.comment); | |
| 1696 | |
| 1697 accept(NodeVisitor visitor) => visitor.visitComment(this); | |
| 1698 Comment _clone() => new Comment(comment); | |
| 1699 | |
| 1700 void visitChildren(NodeVisitor visitor) {} | |
| 1701 } | |
| 1702 | |
| 1703 /** | |
| 1704 * A comment for expressions. | |
| 1705 * | |
| 1706 * Extends [Expression] so we can add comments before expressions. | |
| 1707 * Has the highest possible precedence, so we don't add parentheses around it. | |
| 1708 */ | |
| 1709 class CommentExpression extends Expression { | |
| 1710 final String comment; | |
| 1711 final Expression expression; | |
| 1712 | |
| 1713 CommentExpression(this.comment, this.expression); | |
| 1714 | |
| 1715 int get precedenceLevel => PRIMARY; | |
| 1716 accept(NodeVisitor visitor) => visitor.visitCommentExpression(this); | |
| 1717 CommentExpression _clone() => new CommentExpression(comment, expression); | |
| 1718 | |
| 1719 void visitChildren(NodeVisitor visitor) => expression.accept(visitor); | |
| 1720 } | |
| 1721 | |
| 1722 /** | |
| 1723 * Represents allowed module items: | |
| 1724 * [Statement], [ImportDeclaration], and [ExportDeclaration]. | |
| 1725 */ | |
| 1726 abstract class ModuleItem extends Node {} | |
| 1727 | |
| 1728 class ImportDeclaration extends ModuleItem { | |
| 1729 final Identifier defaultBinding; // Can be null. | |
| 1730 | |
| 1731 // Can be null, a single specifier of `* as name`, or a list. | |
| 1732 final List<NameSpecifier> namedImports; | |
| 1733 | |
| 1734 final LiteralString from; | |
| 1735 | |
| 1736 ImportDeclaration({this.defaultBinding, this.namedImports, this.from}); | |
| 1737 | |
| 1738 /** The `import "name.js"` form of import */ | |
| 1739 ImportDeclaration.all(LiteralString module) : this(from: module); | |
| 1740 | |
| 1741 /** If this import has `* as name` returns the name, otherwise null. */ | |
| 1742 String get importStarAs { | |
| 1743 if (namedImports != null && namedImports.length == 1 && | |
| 1744 namedImports[0].name == '*') { | |
| 1745 return namedImports[0].asName; | |
| 1746 } | |
| 1747 return null; | |
| 1748 } | |
| 1749 | |
| 1750 accept(NodeVisitor visitor) => visitor.visitImportDeclaration(this); | |
| 1751 void visitChildren(NodeVisitor visitor) { | |
| 1752 if (namedImports != null) { | |
| 1753 for (NameSpecifier name in namedImports) name.accept(visitor); | |
| 1754 } | |
| 1755 from.accept(visitor); | |
| 1756 } | |
| 1757 ImportDeclaration _clone() => new ImportDeclaration( | |
| 1758 defaultBinding: defaultBinding, namedImports: namedImports, from: from); | |
| 1759 } | |
| 1760 | |
| 1761 class ExportDeclaration extends ModuleItem { | |
| 1762 /** | |
| 1763 * Exports a name from this module. | |
| 1764 * | |
| 1765 * This can be a [ClassDeclaration] or [FunctionDeclaration]. | |
| 1766 * If [isDefault] is true, it can also be an [Expression]. | |
| 1767 * Otherwise it can be a [VariableDeclarationList] or an [ExportClause]. | |
| 1768 */ | |
| 1769 final Node exported; | |
| 1770 | |
| 1771 /** True if this is an `export default`. */ | |
| 1772 final bool isDefault; | |
| 1773 | |
| 1774 ExportDeclaration(this.exported, {this.isDefault: false}) { | |
| 1775 assert(exported is ClassDeclaration || | |
| 1776 exported is FunctionDeclaration || | |
| 1777 isDefault | |
| 1778 ? exported is Expression | |
| 1779 : exported is VariableDeclarationList || | |
| 1780 exported is ExportClause); | |
| 1781 } | |
| 1782 | |
| 1783 accept(NodeVisitor visitor) => visitor.visitExportDeclaration(this); | |
| 1784 visitChildren(NodeVisitor visitor) => exported.accept(visitor); | |
| 1785 ExportDeclaration _clone() => | |
| 1786 new ExportDeclaration(exported, isDefault: isDefault); | |
| 1787 } | |
| 1788 | |
| 1789 class ExportClause extends Node { | |
| 1790 final List<NameSpecifier> exports; | |
| 1791 final LiteralString from; // Can be null. | |
| 1792 | |
| 1793 ExportClause(this.exports, {this.from}); | |
| 1794 | |
| 1795 /** The `export * from 'name.js'` form. */ | |
| 1796 ExportClause.star(LiteralString from) | |
| 1797 : this([new NameSpecifier('*')], from: from); | |
| 1798 | |
| 1799 /** True if this is an `export *`. */ | |
| 1800 bool get exportStar => exports.length == 1 && exports[0].name == '*'; | |
| 1801 | |
| 1802 accept(NodeVisitor visitor) => visitor.visitExportClause(this); | |
| 1803 void visitChildren(NodeVisitor visitor) { | |
| 1804 for (NameSpecifier name in exports) name.accept(visitor); | |
| 1805 if (from != null) from.accept(visitor); | |
| 1806 } | |
| 1807 ExportClause _clone() => new ExportClause(exports, from: from); | |
| 1808 } | |
| 1809 | |
| 1810 /** An import or export specifier. */ | |
| 1811 class NameSpecifier extends Node { | |
| 1812 // TODO(jmesserly): should we wrap this in a node of some sort? | |
| 1813 final String name; | |
| 1814 final String asName; // Can be null. | |
| 1815 | |
| 1816 NameSpecifier(this.name, {this.asName}); | |
| 1817 | |
| 1818 accept(NodeVisitor visitor) => visitor.visitNameSpecifier(this); | |
| 1819 void visitChildren(NodeVisitor visitor) {} | |
| 1820 NameSpecifier _clone() => new NameSpecifier(name, asName: asName); | |
| 1821 } | |
| 1822 | |
| 1823 // TODO(jmesserly): should this be related to [Program]? | |
| 1824 class Module extends Node { | |
| 1825 /// The module's name | |
| 1826 // TODO(jmesserly): this is not declared in ES6, but is known by the loader. | |
| 1827 // We use this because some ES5 desugarings require it. | |
| 1828 final String name; | |
| 1829 | |
| 1830 final List<ModuleItem> body; | |
| 1831 Module(this.body, {this.name}); | |
| 1832 | |
| 1833 accept(NodeVisitor visitor) => visitor.visitModule(this); | |
| 1834 void visitChildren(NodeVisitor visitor) { | |
| 1835 for (ModuleItem item in body) item.accept(visitor); | |
| 1836 } | |
| 1837 Module _clone() => new Module(body); | |
| 1838 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1879373004:
Implement modular compilation (Closed)
Base URL: git@github.com:dart-lang/dev_compiler.git@master