DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (409f3966645a)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911
// Type aliases and enums.

typedef FrozenArray<(SpreadElement or Expression)> Arguments;
typedef DOMString string;
typedef string Identifier;
typedef string IdentifierName;
typedef string Label;

enum VariableDeclarationKind {
  "var",
  "let",
  "const"
};

enum CompoundAssignmentOperator {
  "+=",
  "-=",
  "*=",
  "/=",
  "%=",
  "**=",
  "<<=",
  ">>=",
  ">>>=",
  "|=",
  "^=",
  "&="
};

enum BinaryOperator {
  ",",
  "||",
  "&&",
  "|",
  "^",
  "&",
  "==",
  "!=",
  "===",
  "!==",
  "<",
  "<=",
  ">",
  ">=",
  "in",
  "instanceof",
  "<<",
  ">>",
  ">>>",
  "+",
  "-",
  "*",
  "/",
  "%",
  "**",
};

enum UnaryOperator {
  "+",
  "-",
  "!",
  "~",
  "typeof",
  "void",
  "delete"
};

enum UpdateOperator {
  "++",
  "--"
};


// deferred assertions

interface AssertedBlockScope {
  // checked eagerly during transformation
  attribute FrozenArray<IdentifierName> lexicallyDeclaredNames;

  // checked lazily as inner functions are invoked
  attribute FrozenArray<IdentifierName> capturedNames;
  attribute boolean hasDirectEval;
};

interface AssertedVarScope {
  // checked eagerly during transformation
  attribute FrozenArray<IdentifierName> lexicallyDeclaredNames;
  attribute FrozenArray<IdentifierName> varDeclaredNames;

  // checked lazily as inner functions are invoked
  attribute FrozenArray<IdentifierName> capturedNames;
  attribute boolean hasDirectEval;
};

interface AssertedParameterScope {
  // checked eagerly during transformation
  attribute FrozenArray<IdentifierName> parameterNames;

  // checked lazily as inner functions are invoked
  attribute FrozenArray<IdentifierName> capturedNames;
  attribute boolean hasDirectEval;
};

// nodes

interface Node {
  [TypeIndicator] readonly attribute Type type;
};

typedef (Script or Module) Program;

typedef (DoWhileStatement or
         ForInStatement or
         ForOfStatement or
         ForStatement or
         WhileStatement)
        IterationStatement;

typedef (Block or
         BreakStatement or
         ContinueStatement or
         ClassDeclaration or
         DebuggerStatement or
         EmptyStatement or
         ExpressionStatement or
         FunctionDeclaration or
         IfStatement or
         IterationStatement or
         LabelledStatement or
         ReturnStatement or
         SwitchStatement or
         SwitchStatementWithDefault or
         ThrowStatement or
         TryCatchStatement or
         TryFinallyStatement or
         VariableDeclaration or
         WithStatement)
        Statement;

typedef (LiteralBooleanExpression or
         LiteralInfinityExpression or
         LiteralNullExpression or
         LiteralNumericExpression or
         LiteralStringExpression)
        Literal;

typedef (Literal or
         LiteralRegExpExpression or
         ArrayExpression or
         ArrowExpression or
         AssignmentExpression or
         BinaryExpression or
         CallExpression or
         CompoundAssignmentExpression or
         ComputedMemberExpression or
         ConditionalExpression or
         ClassExpression or
         FunctionExpression or
         IdentifierExpression or
         NewExpression or
         NewTargetExpression or
         ObjectExpression or
         UnaryExpression or
         StaticMemberExpression or
         TemplateExpression or
         ThisExpression or
         UpdateExpression or
         YieldExpression or
         YieldStarExpression or
         AwaitExpression)
        Expression;

typedef (ComputedPropertyName or
         LiteralPropertyName)
        PropertyName;

typedef (Method or Getter or Setter) MethodDefinition;

typedef (MethodDefinition or
         DataProperty or
         ShorthandProperty)
        ObjectProperty;

typedef (ExportAllFrom or
         ExportFrom or
         ExportLocals or
         ExportDefault or
         Export)
        ExportDeclaration;

typedef (ImportNamespace or Import) ImportDeclaration;

typedef (EagerFunctionDeclaration or SkippableFunctionDeclaration) FunctionDeclaration;

typedef (EagerFunctionExpression or SkippableFunctionExpression) FunctionExpression;

typedef (EagerMethod or SkippableMethod) Method;

typedef (EagerGetter or SkippableGetter) Getter;

typedef (EagerSetter or SkippableSetter) Setter;

typedef (EagerArrowExpression or SkippableArrowExpression) ArrowExpression;

// bindings

interface BindingIdentifier : Node {
  attribute Identifier name;
};

typedef (ObjectBinding or
         ArrayBinding)
        BindingPattern;
typedef (BindingPattern or
         BindingIdentifier)
        Binding;

typedef (AssignmentTargetIdentifier or
         ComputedMemberAssignmentTarget or
         StaticMemberAssignmentTarget)
        SimpleAssignmentTarget;
typedef (ObjectAssignmentTarget or
         ArrayAssignmentTarget)
        AssignmentTargetPattern;
// `DestructuringAssignmentTarget`
typedef (AssignmentTargetPattern or
         SimpleAssignmentTarget)
        AssignmentTarget;

// `FormalParameter`
typedef (Binding or
         BindingWithInitializer)
        Parameter;

interface BindingWithInitializer : Node {
  attribute Binding binding;
  attribute Expression init;
};

interface AssignmentTargetIdentifier : Node {
  attribute Identifier name;
};

interface ComputedMemberAssignmentTarget : Node {
  // The object whose property is being assigned.
  attribute (Expression or Super) _object;
  // The expression resolving to the name of the property to be accessed.
  attribute Expression expression;
};

interface StaticMemberAssignmentTarget : Node {
  // The object whose property is being assigned.
  attribute (Expression or Super) _object;
  // The name of the property to be accessed.
  attribute IdentifierName property;
};

// `ArrayBindingPattern`
interface ArrayBinding : Node {
  // The elements of the array pattern; a null value represents an elision.
  attribute FrozenArray<(Binding or BindingWithInitializer)?> elements;
  attribute Binding? rest;
};

// `SingleNameBinding`
interface BindingPropertyIdentifier : Node {
  attribute BindingIdentifier binding;
  attribute Expression? init;
};

// `BindingProperty :: PropertyName : BindingElement`
interface BindingPropertyProperty : Node {
  attribute PropertyName name;
  attribute (Binding or BindingWithInitializer) binding;
};

typedef (BindingPropertyIdentifier or
         BindingPropertyProperty)
        BindingProperty;

interface ObjectBinding : Node {
  attribute FrozenArray<BindingProperty> properties;
};

// This interface represents the case where the initializer is present in
// `AssignmentElement :: DestructuringAssignmentTarget Initializer_opt`.
interface AssignmentTargetWithInitializer : Node {
  attribute AssignmentTarget binding;
  attribute Expression init;
};

// `ArrayAssignmentPattern`
interface ArrayAssignmentTarget : Node {
  // The elements of the array pattern; a null value represents an elision.
  attribute FrozenArray<(AssignmentTarget or AssignmentTargetWithInitializer?)> elements;
  attribute AssignmentTarget? rest;
};

// `AssignmentProperty :: IdentifierReference Initializer_opt`
interface AssignmentTargetPropertyIdentifier : Node {
  attribute AssignmentTargetIdentifier binding;
  attribute Expression? init;
};

// `AssignmentProperty :: PropertyName : Node`
interface AssignmentTargetPropertyProperty : Node {
  attribute PropertyName name;
  attribute (AssignmentTarget or AssignmentTargetWithInitializer) binding;
};

typedef (AssignmentTargetPropertyIdentifier or
         AssignmentTargetPropertyProperty)
        AssignmentTargetProperty;

// `ObjectAssignmentPattern`
interface ObjectAssignmentTarget : Node {
  attribute FrozenArray<AssignmentTargetProperty> properties;
};


// classes

interface ClassExpression : Node {
  attribute BindingIdentifier? name;
  attribute Expression? super;
  attribute FrozenArray<ClassElement> elements;
};

interface ClassDeclaration : Node {
  attribute BindingIdentifier name;
  attribute Expression? super;
  attribute FrozenArray<ClassElement> elements;
};

interface ClassElement : Node {
  // True iff `IsStatic` of ClassElement is true.
  attribute boolean isStatic;
  attribute MethodDefinition method;
};


// modules

interface Module : Node {
  attribute AssertedVarScope? scope;
  attribute FrozenArray<Directive> directives;
  attribute FrozenArray<(ImportDeclaration or ExportDeclaration or Statement)> items;
};

// An `ImportDeclaration` not including a namespace import.
interface Import : Node {
  attribute string moduleSpecifier;
  // `ImportedDefaultBinding`, if present.
  attribute BindingIdentifier? defaultBinding;
  attribute FrozenArray<ImportSpecifier> namedImports;
};

// An `ImportDeclaration` including a namespace import.
interface ImportNamespace : Node {
  attribute string moduleSpecifier;
  // `ImportedDefaultBinding`, if present.
  attribute BindingIdentifier? defaultBinding;
  attribute BindingIdentifier namespaceBinding;
};

interface ImportSpecifier : Node {
  // The `IdentifierName` in the production `ImportSpecifier :: IdentifierName as ImportedBinding`;
  // absent if this specifier represents the production `ImportSpecifier :: ImportedBinding`.
  attribute IdentifierName? name;
  attribute BindingIdentifier binding;
};

// `export * FromClause;`
interface ExportAllFrom : Node {
  attribute string moduleSpecifier;
};

// `export ExportClause FromClause;`
interface ExportFrom : Node {
  attribute FrozenArray<ExportFromSpecifier> namedExports;
  attribute string moduleSpecifier;
};

// `export ExportClause;`
interface ExportLocals : Node {
  attribute FrozenArray<ExportLocalSpecifier> namedExports;
};

// `export VariableStatement`, `export Declaration`
interface Export : Node {
  attribute (FunctionDeclaration or ClassDeclaration or VariableDeclaration) declaration;
};

// `export default HoistableDeclaration`,
// `export default ClassDeclaration`,
// `export default AssignmentExpression`
interface ExportDefault : Node {
  attribute (FunctionDeclaration or ClassDeclaration or Expression) body;
};

// `ExportSpecifier`, as part of an `ExportFrom`.
interface ExportFromSpecifier : Node {
  // The only `IdentifierName in `ExportSpecifier :: IdentifierName`,
  // or the first in `ExportSpecifier :: IdentifierName as IdentifierName`.
  attribute IdentifierName name;
  // The second `IdentifierName` in `ExportSpecifier :: IdentifierName as IdentifierName`,
  // if that is the production represented.
  attribute IdentifierName? exportedName;
};

// `ExportSpecifier`, as part of an `ExportLocals`.
interface ExportLocalSpecifier : Node {
  // The only `IdentifierName in `ExportSpecifier :: IdentifierName`,
  // or the first in `ExportSpecifier :: IdentifierName as IdentifierName`.
  attribute IdentifierExpression name;
  // The second `IdentifierName` in `ExportSpecifier :: IdentifierName as IdentifierName`, if present.
  attribute IdentifierName? exportedName;
};


// property definition

// `MethodDefinition :: PropertyName ( UniqueFormalParameters ) { FunctionBody }`,
// `GeneratorMethod :: * PropertyName ( UniqueFormalParameters ) { GeneratorBody }`,
// `AsyncMethod :: async PropertyName ( UniqueFormalParameters ) { AsyncFunctionBody }`
interface EagerMethod : Node {
  // True for `AsyncMethod`, false otherwise.
  attribute boolean isAsync;
  // True for `GeneratorMethod`, false otherwise.
  attribute boolean isGenerator;
  attribute PropertyName name;
  attribute AssertedParameterScope? parameterScope;
  attribute AssertedVarScope? bodyScope;
  // The `UniqueFormalParameters`.
  attribute FormalParameters params;
  attribute FunctionBody body;
};

[Skippable] interface SkippableMethod : Node {
  attribute EagerMethod skipped;
};

// `get PropertyName ( ) { FunctionBody }`
interface EagerGetter : Node {
  attribute PropertyName name;
  attribute AssertedVarScope? bodyScope;
  attribute FunctionBody body;
};

[Skippable] interface SkippableGetter : Node {
  attribute EagerGetter skipped;
};

// `set PropertyName ( PropertySetParameterList ) { FunctionBody }`
interface EagerSetter : Node {
  attribute PropertyName name;
  attribute AssertedParameterScope? parameterScope;
  attribute AssertedVarScope? bodyScope;
  // The `PropertySetParameterList`.
  attribute Parameter param;
  attribute FunctionBody body;
};

[Skippable] interface SkippableSetter : Node {
  attribute EagerSetter skipped;
};

// `PropertyDefinition :: PropertyName : AssignmentExpression`
interface DataProperty : Node {
  attribute PropertyName name;
  // The `AssignmentExpression`.
  attribute Expression expression;
};

// `PropertyDefinition :: IdentifierReference`
interface ShorthandProperty : Node {
  // The `IdentifierReference`.
  attribute IdentifierExpression name;
};

interface ComputedPropertyName : Node {
  attribute Expression expression;
};

// `LiteralPropertyName`
interface LiteralPropertyName : Node {
  attribute string value;
};


// literals

// `BooleanLiteral`
interface LiteralBooleanExpression : Node {
  attribute boolean value;
};

// A `NumericLiteral` for which the Number value of its MV is positive infinity.
interface LiteralInfinityExpression : Node { };

// `NullLiteral`
interface LiteralNullExpression : Node { };

// `NumericLiteral`
interface LiteralNumericExpression : Node {
  attribute double value;
};

// `RegularExpressionLiteral`
interface LiteralRegExpExpression : Node {
  attribute string pattern;
  attribute string flags;
};

// `StringLiteral`
interface LiteralStringExpression : Node {
  attribute string value;
};


// other expressions

// `ArrayLiteral`
interface ArrayExpression : Node {
  // The elements of the array literal; a null value represents an elision.
  attribute FrozenArray<(SpreadElement or Expression)?> elements;
};

// `ArrowFunction`,
// `AsyncArrowFunction`
interface EagerArrowExpression : Node {
  // True for `AsyncArrowFunction`, false otherwise.
  attribute boolean isAsync;
  attribute AssertedParameterScope? parameterScope;
  attribute AssertedVarScope? bodyScope;
  attribute FormalParameters params;
  attribute (FunctionBody or Expression) body;
};

[Skippable] interface SkippableArrowExpression : Node {
  attribute EagerArrowExpression skipped;
};

// `AssignmentExpression :: LeftHandSideExpression = AssignmentExpression`
interface AssignmentExpression : Node {
  // The `LeftHandSideExpression`.
  attribute AssignmentTarget binding;
  // The `AssignmentExpression` following the `=`.
  attribute Expression expression;
};

// `ExponentiationExpression`,
// `MultiplicativeExpression`,
// `AdditiveExpression`,
// `ShiftExpression`,
// `RelationalExpression`,
// `EqualityExpression`,
// `BitwiseANDExpression`,
// `BitwiseXORExpression`,
// `BitwiseORExpression`,
// `LogicalANDExpression`,
// `LogicalORExpression`
interface BinaryExpression : Node {
  attribute BinaryOperator operator;
  // The expression before the operator.
  attribute Expression left;
  // The expression after the operator.
  attribute Expression right;
};

interface CallExpression : Node {
  attribute (Expression or Super) callee;
  attribute Arguments arguments;
};

// `AssignmentExpression :: LeftHandSideExpression AssignmentOperator AssignmentExpression`
interface CompoundAssignmentExpression : Node {
  attribute CompoundAssignmentOperator operator;
  // The `LeftHandSideExpression`.
  attribute SimpleAssignmentTarget binding;
  // The `AssignmentExpression`.
  attribute Expression expression;
};

interface ComputedMemberExpression : Node {
  // The object whose property is being accessed.
  attribute (Expression or Super) _object;
  // The expression resolving to the name of the property to be accessed.
  attribute Expression expression;
};

// `ConditionalExpression :: LogicalORExpression ? AssignmentExpression : AssignmentExpression`
interface ConditionalExpression : Node {
  // The `LogicalORExpression`.
  attribute Expression test;
  // The first `AssignmentExpression`.
  attribute Expression consequent;
  // The second `AssignmentExpression`.
  attribute Expression alternate;
};

// `FunctionExpression`,
// `GeneratorExpression`,
// `AsyncFunctionExpression`,
interface EagerFunctionExpression : Node {
  attribute boolean isAsync;
  attribute boolean isGenerator;
  attribute BindingIdentifier? name;
  attribute AssertedParameterScope? parameterScope;
  attribute AssertedVarScope? bodyScope;
  attribute FormalParameters params;
  attribute FunctionBody body;
};

[Skippable] interface SkippableFunctionExpression : Node {
  attribute EagerFunctionExpression skipped;
};

// `IdentifierReference`
interface IdentifierExpression : Node {
  attribute Identifier name;
};

interface NewExpression : Node {
  attribute Expression callee;
  attribute Arguments arguments;
};

interface NewTargetExpression : Node { };

interface ObjectExpression : Node {
  attribute FrozenArray<ObjectProperty> properties;
};

interface UnaryExpression : Node {
  attribute UnaryOperator operator;
  attribute Expression operand;
};

interface StaticMemberExpression : Node {
  // The object whose property is being accessed.
  attribute (Expression or Super) _object;
  // The name of the property to be accessed.
  attribute IdentifierName property;
};

// `TemplateLiteral`,
// `MemberExpression :: MemberExpression TemplateLiteral`,
// `CallExpression : CallExpression TemplateLiteral`
interface TemplateExpression : Node {
  // The second `MemberExpression` or `CallExpression`, if present.
  attribute Expression? tag;
  // The contents of the template. This list must be alternating
  // TemplateElements and Expressions, beginning and ending with
  // TemplateElement.
  attribute FrozenArray<(Expression or TemplateElement)> elements;
};

// `PrimaryExpression :: this`
interface ThisExpression : Node { };

// `UpdateExpression :: LeftHandSideExpression ++`,
// `UpdateExpression :: LeftHandSideExpression --`,
// `UpdateExpression :: ++ LeftHandSideExpression`,
// `UpdateExpression :: -- LeftHandSideExpression`
interface UpdateExpression : Node {
  // True for `UpdateExpression :: ++ LeftHandSideExpression` and
  // `UpdateExpression :: -- LeftHandSideExpression`, false otherwise.
  attribute boolean isPrefix;
  attribute UpdateOperator operator;
  attribute SimpleAssignmentTarget operand;
};

// `YieldExpression :: yield`,
// `YieldExpression :: yield AssignmentExpression`
interface YieldExpression : Node {
  // The `AssignmentExpression`, if present.
  attribute Expression? expression;
};

// `YieldExpression :: yield * AssignmentExpression`
interface YieldStarExpression : Node {
  attribute Expression expression;
};

interface AwaitExpression : Node {
  attribute Expression expression;
};


// other statements

interface BreakStatement : Node {
  attribute Label? label;
};

interface ContinueStatement : Node {
  attribute Label? label;
};

interface DebuggerStatement : Node { };

interface DoWhileStatement : Node {
  attribute Expression test;
  attribute Statement body;
};

interface EmptyStatement : Node { };

interface ExpressionStatement : Node {
  attribute Expression expression;
};

interface ForInOfBinding : Node {
  attribute VariableDeclarationKind kind;
  attribute Binding binding;
};

// `for ( LeftHandSideExpression in Expression ) Statement`,
// `for ( var ForBinding in Expression ) Statement`,
// `for ( ForDeclaration in Expression ) Statement`,
// `for ( var BindingIdentifier Initializer in Expression ) Statement`
interface ForInStatement : Node {
  // The expression or declaration before `in`.
  attribute (ForInOfBinding or AssignmentTarget) left;
  // The expression after `in`.
  attribute Expression right;
  attribute Statement body;
};

// `for ( LeftHandSideExpression of Expression ) Statement`,
// `for ( var ForBinding of Expression ) Statement`,
// `for ( ForDeclaration of Expression ) Statement`
interface ForOfStatement : Node {
  // The expression or declaration before `of`.
  attribute (ForInOfBinding or AssignmentTarget) left;
  // The expression after `of`.
  attribute Expression right;
  attribute Statement body;
};

// `for ( Expression ; Expression ; Expression ) Statement`,
// `for ( var VariableDeclarationList ; Expression ; Expression ) Statement`
interface ForStatement : Node {
  // The expression or declaration before the first `;`, if present.
  attribute (VariableDeclaration or Expression)? init;
  // The expression before the second `;`, if present
  attribute Expression? test;
  // The expression after the second `;`, if present
  attribute Expression? update;
  attribute Statement body;
};

// `if ( Expression ) Statement`,
// `if ( Expression ) Statement else Statement`,
interface IfStatement : Node {
  attribute Expression test;
  // The first `Statement`.
  attribute Statement consequent;
  // The second `Statement`, if present.
  attribute Statement? alternate;
};

interface LabelledStatement : Node {
  attribute Label label;
  attribute Statement body;
};

interface ReturnStatement : Node {
  attribute Expression? expression;
};

// A `SwitchStatement` whose `CaseBlock` is
//   `CaseBlock :: { CaseClauses }`.
interface SwitchStatement : Node {
  attribute Expression discriminant;
  attribute FrozenArray<SwitchCase> cases;
};

// A `SwitchStatement` whose `CaseBlock` is
//   `CaseBlock :: { CaseClauses DefaultClause CaseClauses }`.
interface SwitchStatementWithDefault : Node {
  attribute Expression discriminant;
  // The `CaseClauses` before the `DefaultClause`.
  attribute FrozenArray<SwitchCase> preDefaultCases;
  // The `DefaultClause`.
  attribute SwitchDefault defaultCase;
  // The `CaseClauses` after the `DefaultClause`.
  attribute FrozenArray<SwitchCase> postDefaultCases;
};

interface ThrowStatement : Node {
  attribute Expression expression;
};

// `TryStatement :: try Block Catch`
interface TryCatchStatement : Node {
  attribute Block body;
  attribute CatchClause catchClause;
};

// `TryStatement :: try Block Finally`,
// `TryStatement :: try Block Catch Finally`
interface TryFinallyStatement : Node {
  // The `Block`.
  attribute Block body;
  // The `Catch`, if present.
  attribute CatchClause? catchClause;
  // The `Finally`.
  attribute Block finalizer;
};

interface WhileStatement : Node {
  attribute Expression test;
  attribute Statement body;
};

interface WithStatement : Node {
  attribute Expression _object;
  attribute Statement body;
};


// other nodes

interface Block : Node {
  attribute AssertedBlockScope? scope;
  attribute FrozenArray<Statement> statements;
};

// `Catch`
interface CatchClause : Node {
  // `AssertedParameterScope` is used for catch bindings so the declared names
  // are checked using BoundNames.
  attribute AssertedParameterScope? bindingScope;
  attribute Binding binding;
  attribute Block body;
};

// An item in a `DirectivePrologue`
interface Directive : Node {
  attribute string rawValue;
};

interface FormalParameters : Node {
  attribute FrozenArray<Parameter> items;
  attribute Binding? rest;
};

interface FunctionBody : Node {
  attribute FrozenArray<Directive> directives;
  attribute FrozenArray<Statement> statements;
};



// `FunctionDeclaration`,
// `GeneratorDeclaration`,
// `AsyncFunctionDeclaration`
interface EagerFunctionDeclaration : Node {
  attribute boolean isAsync;
  attribute boolean isGenerator;
  attribute BindingIdentifier name;
  attribute AssertedParameterScope? parameterScope;
  attribute AssertedVarScope? bodyScope;
  attribute FormalParameters params;
  attribute FunctionBody body;
};

[Skippable] interface SkippableFunctionDeclaration : Node {
  attribute EagerFunctionDeclaration skipped;
};

interface Script : Node {
  attribute AssertedVarScope? scope;
  attribute FrozenArray<Directive> directives;
  attribute FrozenArray<Statement> statements;
};

interface SpreadElement : Node {
  attribute Expression expression;
};

// `super`
interface Super : Node { };

// `CaseClause`
interface SwitchCase : Node {
  attribute Expression test;
  attribute FrozenArray<Statement> consequent;
};

// `DefaultClause`
interface SwitchDefault : Node {
  attribute FrozenArray<Statement> consequent;
};

// `TemplateCharacters`
interface TemplateElement : Node {
  attribute string rawValue;
};

interface VariableDeclaration : Node {
  attribute VariableDeclarationKind kind;
  [NonEmpty] attribute FrozenArray<VariableDeclarator> declarators;
};

interface VariableDeclarator : Node {
  attribute Binding binding;
  attribute Expression? init;
};