Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 47353x 24310x 2x 2x 24308x 24308x 24310x 24310x 24310x 24310x 6x 24310x 1x 1x 24307x 24310x 22476x 1x 1x 22475x 22476x 1680x 1680x 22476x 22626x 24310x 2x 2x 2x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 22624x 47353x 47353x 33002x 33002x 47353x 47353x 47353x 47353x 47353x 47353x 16315x 2176x 2176x 14139x 14139x 14139x 14139x 14139x 14139x 16315x 16315x 16315x 14139x 16315x 12241x 12241x 14139x 14139x 14139x 14139x 14139x 47353x 47353x 47353x 47353x 47353x 47353x 437430x 437430x 47353x 47353x 47353x 47353x 47353x 47353x 5655x 5655x 5655x 5655x 47353x 47353x 47353x 47353x 47353x 47353x 1760x 1760x 47353x 47353x 47353x 47353x 47353x 47353x 93478x 93478x 93478x 93478x 93478x 93478x 93478x 93478x 93478x 31668x 93478x 58837x 61810x 2973x 2973x 2973x 2973x 93478x 47353x 2x 2x 4802x 4802x 4802x 4802x 4802x 4802x 4802x 5262x 5262x 5262x 5262x 5262x 2759x 2759x 5262x 5262x 5262x 5262x 5262x 4802x 2x 2x 2x 2x 2x 2x 2x 2x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 3315x 1395x 1401x 1401x 1395x 3315x 14351x 14351x 14351x 14351x 14351x 2428x 2428x 2428x 2428x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 9101x 9101x 9101x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 10288x 10288x 10288x 10288x 7985x 214x 214x 214x 214x 214x 214x 214x 214x 214x 51x 63x 63x 63x 214x 163x 163x 163x 163x 163x 163x 163x 163x 163x 163x 7985x 199x 199x 7985x 10288x 10288x 10288x 14351x 14351x 14351x 14351x 14351x 399x 399x 399x 89x 89x 14351x 14351x 14351x 14351x 14351x 41056x 41056x 33062x 33062x 14351x 14351x 14351x 315x 315x 307x 307x 307x 307x 307x 307x 315x 236x 315x 200x 190x 185x 185x 190x 200x 307x 307x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 1187x 1187x 1187x 1291x 1291x 1187x 1187x 1187x 1187x 1187x 1187x 17x 17x 1187x 1187x 1758x 1758x 492x 492x 492x 1758x 182x 182x 182x 1758x 1576x 112x 112x 112x 1575x 1464x 1464x 1576x 1576x 1576x 1758x 14351x 14351x 14351x 14351x 2118x 2118x 14351x 14351x 14351x 338x 338x 338x 338x 338x 338x 338x 14351x 14351x 14351x 1609x 1688x 1688x 14351x 14351x 14351x 288x 288x 288x 288x 288x 288x 288x 14351x 14351x 14351x 1009x 1009x 1009x 1009x 1009x 1009x 1009x 14351x 14351x 14351x 2018x 2018x 2018x 2018x 2018x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 82x 82x 14351x 14351x 14351x 6797x 6797x 7479x 7479x 7479x 7479x 7479x 7479x 7967x 7967x 7967x 7967x 7967x 7967x 7967x 7967x 7475x 6793x 6793x 14351x 14351x 14351x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 14351x 14351x 14351x 933x 933x 933x 933x 933x 933x 886x 886x 882x 882x 886x 933x 933x 933x 933x 933x 933x 933x 933x 1043x 1043x 1043x 1043x 1043x 1043x 1963x 15x 15x 1043x 1043x 56x 56x 56x 56x 56x 1043x 1043x 1043x 1043x 933x 87x 87x 933x 933x 933x 933x 111x 111x 111x 111x 111x 933x 933x 933x 933x 3246x 3246x 933x 931x 931x 931x 931x 931x 933x 1368x 81x 81x 1368x 931x 931x 931x 933x 933x 933x 933x 933x 933x 933x 933x 933x 14351x 14351x 14351x 171x 171x 171x 90x 90x 171x 171x 143x 143x 131x 131x 131x 131x 131x 183x 183x 183x 131x 143x 171x 171x 99x 99x 93x 93x 93x 93x 93x 149x 149x 149x 93x 99x 14351x 14351x 14351x 91x 91x 91x 91x 91x 70x 70x 91x 91x 91x 91x 91x 91x 49x 49x 49x 49x 91x 91x 14351x 14351x 14351x 15405x 15405x 15405x 14351x 14351x 14351x 917x 917x 917x 917x 917x 917x 917x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 14351x 185x 185x 141x 141x 141x 14346x 14346x 14346x 14351x 33055x 33055x 14346x 14351x 3373x 905x 905x 100x 100x 905x 905x 905x 3371x 2468x 2544x 2544x 2290x 2290x 2290x 2468x 2468x 3373x 14346x 14346x 14346x 14346x 14346x 14346x 2x 2x 2x 2x 2x 2x 2x 27745x 27745x 27745x 27745x 27745x 27745x 27745x 298509x 298509x 298509x 27745x 27745x 2x 2x 2x 2x 2x 2x 2x 2x 16949x 16949x 16314x 16314x 16314x 16314x 16314x 16949x 4778x 4778x 4718x 4718x 4718x 16254x 16949x 55x 55x 55x 16254x 16949x 16003x 16003x 16003x 16767x 8728x 8728x 14128x 8656x 8656x 8656x | import is_reference from 'is-reference';
import { walk } from 'zimmerframe';
import { is_element_node } from './nodes.js';
import * as b from '../utils/builders.js';
import * as e from '../errors.js';
import { extract_identifiers, extract_identifiers_from_destructuring } from '../utils/ast.js';
import { JsKeywords, Runes } from './constants.js';
export class Scope {
/** @type {ScopeRoot} */
root;
/**
* The immediate parent scope
* @type {Scope | null}
*/
parent;
/**
* Whether or not `var` declarations are contained by this scope
* @type {boolean}
*/
#porous;
/**
* A map of every identifier declared by this scope, and all the
* identifiers that reference it
* @type {Map<string, import('#compiler').Binding>}
*/
declarations = new Map();
/**
* A map of declarators to the bindings they declare
* @type {Map<import('estree').VariableDeclarator | import('#compiler').LetDirective, import('#compiler').Binding[]>}
*/
declarators = new Map();
/**
* A set of all the names referenced with this scope
* — useful for generating unique names
* @type {Map<string, { node: import('estree').Identifier; path: import('#compiler').SvelteNode[] }[]>}
*/
references = new Map();
/**
* The scope depth allows us to determine if a state variable is referenced in its own scope,
* which is usually an error. Block statements do not increase this value
*/
function_depth = 0;
/**
*
* @param {ScopeRoot} root
* @param {Scope | null} parent
* @param {boolean} porous
*/
constructor(root, parent, porous) {
this.root = root;
this.parent = parent;
this.#porous = porous;
this.function_depth = parent ? parent.function_depth + (porous ? 0 : 1) : 0;
}
/**
* @param {import('estree').Identifier} node
* @param {import('#compiler').Binding['kind']} kind
* @param {import('#compiler').DeclarationKind} declaration_kind
* @param {null | import('estree').Expression | import('estree').FunctionDeclaration | import('estree').ClassDeclaration | import('estree').ImportDeclaration | import('../types/template.js').EachBlock} initial
* @returns {import('#compiler').Binding}
*/
declare(node, kind, declaration_kind, initial = null) {
if (node.name === '$') {
e.dollar_binding_invalid(node);
}
if (
node.name.startsWith('$') &&
declaration_kind !== 'synthetic' &&
declaration_kind !== 'param' &&
declaration_kind !== 'rest_param' &&
this.function_depth <= 1
) {
e.dollar_prefix_invalid(node);
}
if (this.parent) {
if (declaration_kind === 'var' && this.#porous) {
return this.parent.declare(node, kind, declaration_kind);
}
if (declaration_kind === 'import') {
return this.parent.declare(node, kind, declaration_kind, initial);
}
}
if (this.declarations.has(node.name)) {
// This also errors on var/function types, but that's arguably a good thing
e.declaration_duplicate(node, node.name);
}
/** @type {import('#compiler').Binding} */
const binding = {
node,
references: [],
legacy_dependencies: [],
initial,
mutated: false,
scope: this,
kind,
declaration_kind,
is_called: false,
prop_alias: null,
expression: null,
mutation: null,
reassigned: false,
metadata: null
};
this.declarations.set(node.name, binding);
this.root.conflicts.add(node.name);
return binding;
}
child(porous = false) {
return new Scope(this.root, this, porous);
}
/**
* @param {string} preferred_name
* @returns {string}
*/
generate(preferred_name) {
if (this.#porous) {
return /** @type {Scope} */ (this.parent).generate(preferred_name);
}
preferred_name = preferred_name.replace(/[^a-zA-Z0-9_$]/g, '_').replace(/^[0-9]/, '_');
let name = preferred_name;
let n = 1;
while (
this.references.has(name) ||
this.declarations.has(name) ||
this.root.conflicts.has(name) ||
JsKeywords.includes(name)
) {
name = `${preferred_name}_${n++}`;
}
this.references.set(name, []);
this.root.conflicts.add(name);
return name;
}
/**
* @param {string} name
* @returns {import('#compiler').Binding | null}
*/
get(name) {
return this.declarations.get(name) ?? this.parent?.get(name) ?? null;
}
/**
* @param {import('estree').VariableDeclarator | import('#compiler').LetDirective} node
* @returns {import('#compiler').Binding[]}
*/
get_bindings(node) {
const bindings = this.declarators.get(node);
if (!bindings) {
throw new Error('No binding found for declarator');
}
return bindings;
}
/**
* @param {string} name
* @returns {Scope | null}
*/
owner(name) {
return this.declarations.has(name) ? this : this.parent && this.parent.owner(name);
}
/**
* @param {import('estree').Identifier} node
* @param {import('#compiler').SvelteNode[]} path
*/
reference(node, path) {
path = [...path]; // ensure that mutations to path afterwards don't affect this reference
let references = this.references.get(node.name);
if (!references) this.references.set(node.name, (references = []));
references.push({ node, path });
const binding = this.declarations.get(node.name);
if (binding) {
binding.references.push({ node, path });
} else if (this.parent) {
this.parent.reference(node, path);
} else {
// no binding was found, and this is the top level scope,
// which means this is a global
this.root.conflicts.add(node.name);
}
}
}
export class ScopeRoot {
/** @type {Set<string>} */
conflicts = new Set();
/**
* @param {string} preferred_name
*/
unique(preferred_name) {
preferred_name = preferred_name.replace(/[^a-zA-Z0-9_$]/g, '_');
let final_name = preferred_name;
let n = 1;
while (this.conflicts.has(final_name)) {
final_name = `${preferred_name}_${n++}`;
}
this.conflicts.add(final_name);
const id = b.id(final_name);
return id;
}
}
/**
* @param {import('#compiler').SvelteNode} ast
* @param {ScopeRoot} root
* @param {boolean} allow_reactive_declarations
* @param {Scope | null} parent
*/
export function create_scopes(ast, root, allow_reactive_declarations, parent) {
/** @typedef {{ scope: Scope }} State */
/**
* A map of node->associated scope. A node appearing in this map does not necessarily mean that it created a scope
* @type {Map<import('#compiler').SvelteNode, Scope>}
*/
const scopes = new Map();
const scope = new Scope(root, parent, false);
scopes.set(ast, scope);
/** @type {State} */
const state = { scope };
/** @type {[Scope, { node: import('estree').Identifier; path: import('#compiler').SvelteNode[] }][]} */
const references = [];
/** @type {[Scope, import('estree').Pattern | import('estree').MemberExpression][]} */
const updates = [];
/**
* An array of reactive declarations, i.e. the `a` in `$: a = b * 2`
* @type {import('estree').Identifier[]}
*/
const possible_implicit_declarations = [];
/**
* @param {Scope} scope
* @param {import('estree').Pattern[]} params
*/
function add_params(scope, params) {
for (const param of params) {
for (const node of extract_identifiers(param)) {
scope.declare(node, 'normal', param.type === 'RestElement' ? 'rest_param' : 'param');
}
}
}
/**
* @type {import('zimmerframe').Visitor<import('estree').Node, State, import('#compiler').SvelteNode>}
*/
const create_block_scope = (node, { state, next }) => {
const scope = state.scope.child(true);
scopes.set(node, scope);
next({ scope });
};
const skip = () => {};
/**
* @type {import('zimmerframe').Visitor<import('#compiler').ElementLike, State, import('#compiler').SvelteNode>}
*/
const SvelteFragment = (node, { state, next }) => {
const [scope] = analyze_let_directives(node, state.scope);
scopes.set(node, scope);
next({ scope });
};
/**
* @param {import('#compiler').ElementLike} node
* @param {Scope} parent
*/
function analyze_let_directives(node, parent) {
const scope = parent.child();
let is_default_slot = true;
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
/** @type {import('#compiler').Binding[]} */
const bindings = [];
scope.declarators.set(attribute, bindings);
// attach the scope to the directive itself, as well as the
// contents to which it applies
scopes.set(attribute, scope);
if (attribute.expression) {
for (const id of extract_identifiers_from_destructuring(attribute.expression)) {
const binding = scope.declare(id, 'derived', 'const');
bindings.push(binding);
}
} else {
/** @type {import('estree').Identifier} */
const id = {
name: attribute.name,
type: 'Identifier',
start: attribute.start,
end: attribute.end
};
const binding = scope.declare(id, 'derived', 'const');
bindings.push(binding);
}
} else if (attribute.type === 'Attribute' && attribute.name === 'slot') {
is_default_slot = false;
}
}
return /** @type {const} */ ([scope, is_default_slot]);
}
/**
* @type {import('zimmerframe').Visitor<import('#compiler').AnimateDirective | import('#compiler').TransitionDirective | import('#compiler').UseDirective, State, import('#compiler').SvelteNode>}
*/
const SvelteDirective = (node, { state, path, visit }) => {
state.scope.reference(b.id(node.name.split('.')[0]), path);
if (node.expression) {
visit(node.expression);
}
};
walk(ast, state, {
// references
Identifier(node, { path, state }) {
const parent = path.at(-1);
if (parent && is_reference(node, /** @type {import('estree').Node} */ (parent))) {
references.push([state.scope, { node, path: path.slice() }]);
}
},
LabeledStatement(node, { path, next }) {
if (path.length > 1 || !allow_reactive_declarations) return next();
if (node.label.name !== '$') return next();
// create a scope for the $: block
const scope = state.scope.child();
scopes.set(node, scope);
if (
node.body.type === 'ExpressionStatement' &&
node.body.expression.type === 'AssignmentExpression'
) {
for (const id of extract_identifiers(node.body.expression.left)) {
if (!id.name.startsWith('$')) {
possible_implicit_declarations.push(id);
}
}
}
next({ scope });
},
SvelteFragment,
SlotElement: SvelteFragment,
SvelteElement: SvelteFragment,
RegularElement: SvelteFragment,
Component(node, { state, visit, path }) {
state.scope.reference(b.id(node.name), path);
for (const attribute of node.attributes) {
visit(attribute);
}
// let:x is super weird:
// - for the default slot, its scope only applies to children that are not slots themselves
// - for named slots, its scope applies to the component itself, too
const [scope, is_default_slot] = analyze_let_directives(node, state.scope);
if (!is_default_slot) {
scopes.set(node, scope);
}
for (const child of node.fragment.nodes) {
if (
is_element_node(child) &&
child.attributes.some(
(attribute) => attribute.type === 'Attribute' && attribute.name === 'slot'
)
) {
// <div slot="..."> inherits the scope above the component unless the component is a named slot itself, because slots are hella weird
scopes.set(child, is_default_slot ? state.scope : scope);
visit(child, { scope: is_default_slot ? state.scope : scope });
} else {
if (child.type === 'ExpressionTag') {
// expression tag is a special case — we don't visit it directly, but via process_children,
// so we need to set the scope on the expression rather than the tag itself
scopes.set(child.expression, scope);
} else {
scopes.set(child, scope);
}
visit(child, { scope });
}
}
},
// updates
AssignmentExpression(node, { state, next }) {
updates.push([state.scope, node.left]);
next();
},
UpdateExpression(node, { state, next }) {
updates.push([
state.scope,
/** @type {import('estree').Identifier | import('estree').MemberExpression} */ (
node.argument
)
]);
next();
},
ImportDeclaration(node, { state }) {
for (const specifier of node.specifiers) {
state.scope.declare(specifier.local, 'normal', 'import', node);
}
},
FunctionExpression(node, { state, next }) {
const scope = state.scope.child();
scopes.set(node, scope);
if (node.id) scope.declare(node.id, 'normal', 'function');
add_params(scope, node.params);
next({ scope });
},
FunctionDeclaration(node, { state, next }) {
if (node.id) state.scope.declare(node.id, 'normal', 'function', node);
const scope = state.scope.child();
scopes.set(node, scope);
add_params(scope, node.params);
next({ scope });
},
ArrowFunctionExpression(node, { state, next }) {
const scope = state.scope.child();
scopes.set(node, scope);
add_params(scope, node.params);
next({ scope });
},
ForStatement: create_block_scope,
ForInStatement: create_block_scope,
ForOfStatement: create_block_scope,
BlockStatement: create_block_scope,
SwitchStatement: create_block_scope,
ClassDeclaration(node, { state, next }) {
if (node.id) state.scope.declare(node.id, 'normal', 'const', node);
next();
},
VariableDeclaration(node, { state, path, next }) {
const is_parent_const_tag = path.at(-1)?.type === 'ConstTag';
for (const declarator of node.declarations) {
/** @type {import('#compiler').Binding[]} */
const bindings = [];
state.scope.declarators.set(declarator, bindings);
for (const id of extract_identifiers(declarator.id)) {
const binding = state.scope.declare(
id,
is_parent_const_tag ? 'derived' : 'normal',
node.kind,
declarator.init
);
bindings.push(binding);
}
}
next();
},
CatchClause(node, { state, next }) {
if (node.param) {
const scope = state.scope.child(true);
scopes.set(node, scope);
for (const id of extract_identifiers(node.param)) {
scope.declare(id, 'normal', 'let');
}
next({ scope });
} else {
next();
}
},
EachBlock(node, { state, visit }) {
// Array part is still from the scope above
/** @type {Set<import('estree').Identifier>} */
const references_within = new Set();
const idx = references.length;
visit(node.expression);
for (let i = idx; i < references.length; i++) {
const [scope, { node: id }] = references[i];
if (scope === state.scope) {
references_within.add(id);
}
}
scopes.set(node.expression, state.scope);
// context and children are a new scope
const scope = state.scope.child();
scopes.set(node, scope);
// declarations
for (const id of extract_identifiers(node.context)) {
const binding = scope.declare(id, 'each', 'const');
let inside_rest = false;
let is_rest_id = false;
walk(node.context, null, {
Identifier(node) {
if (inside_rest && node === id) {
is_rest_id = true;
}
},
RestElement(_, { next }) {
const prev = inside_rest;
inside_rest = true;
next();
inside_rest = prev;
}
});
binding.metadata = { inside_rest: is_rest_id };
}
if (node.context.type !== 'Identifier') {
scope.declare(b.id('$$item'), 'derived', 'synthetic');
}
// Visit to pick up references from default initializers
visit(node.context, { scope });
if (node.index) {
const is_keyed =
node.key &&
(node.key.type !== 'Identifier' || !node.index || node.key.name !== node.index);
scope.declare(b.id(node.index), is_keyed ? 'derived' : 'normal', 'const', node);
}
if (node.key) visit(node.key, { scope });
// children
for (const child of node.body.nodes) {
visit(child, { scope });
}
if (node.fallback) visit(node.fallback, { scope });
// Check if inner scope shadows something from outer scope.
// This is necessary because we need access to the array expression of the each block
// in the inner scope if bindings are used, in order to invalidate the array.
let needs_array_deduplication = false;
for (const [name] of scope.declarations) {
if (state.scope.get(name) !== null) {
needs_array_deduplication = true;
}
}
node.metadata = {
contains_group_binding: false,
array_name: needs_array_deduplication ? state.scope.root.unique('$$array') : null,
index: scope.root.unique('$$index'),
item: node.context.type === 'Identifier' ? node.context : b.id('$$item'),
declarations: scope.declarations,
references: [...references_within]
.map((id) => /** @type {import('#compiler').Binding} */ (state.scope.get(id.name)))
.filter(Boolean),
is_controlled: false
};
},
AwaitBlock(node, context) {
context.visit(node.expression);
if (node.pending) {
context.visit(node.pending);
}
if (node.then) {
context.visit(node.then);
if (node.value) {
const then_scope = /** @type {Scope} */ (scopes.get(node.then));
const value_scope = context.state.scope.child();
scopes.set(node.value, value_scope);
context.visit(node.value, { scope: value_scope });
for (const id of extract_identifiers(node.value)) {
then_scope.declare(id, 'normal', 'const');
value_scope.declare(id, 'normal', 'const');
}
}
}
if (node.catch) {
context.visit(node.catch);
if (node.error) {
const catch_scope = /** @type {Scope} */ (scopes.get(node.catch));
const error_scope = context.state.scope.child();
scopes.set(node.error, error_scope);
context.visit(node.error, { scope: error_scope });
for (const id of extract_identifiers(node.error)) {
catch_scope.declare(id, 'normal', 'const');
error_scope.declare(id, 'normal', 'const');
}
}
}
},
SnippetBlock(node, context) {
const state = context.state;
// Special-case for root-level snippets: they become part of the instance scope
const is_top_level = !context.path.at(-2);
let scope = state.scope;
if (is_top_level) {
scope = /** @type {Scope} */ (parent);
}
scope.declare(node.expression, 'normal', 'function', node.expression);
const child_scope = state.scope.child();
scopes.set(node, child_scope);
for (const param of node.parameters) {
for (const id of extract_identifiers(param)) {
child_scope.declare(id, 'snippet', 'let');
}
}
context.next({ scope: child_scope });
},
Fragment: (node, context) => {
const scope = context.state.scope.child(node.transparent);
scopes.set(node, scope);
context.next({ scope });
},
BindDirective(node, context) {
updates.push([
context.state.scope,
/** @type {import('estree').Identifier | import('estree').MemberExpression} */ (
node.expression
)
]);
context.next();
},
TransitionDirective: SvelteDirective,
AnimateDirective: SvelteDirective,
UseDirective: SvelteDirective,
// @ts-ignore
TSTypeAnnotation: skip,
TSInterfaceDeclaration: skip,
TSTypeAliasDeclaration: skip,
TSTypeParameterDeclaration: skip,
TSEnumDeclaration: skip
// TODO others
});
for (const id of possible_implicit_declarations) {
const binding = scope.get(id.name);
if (binding) continue; // TODO can also be legacy_reactive if declared outside of reactive statement
scope.declare(id, 'legacy_reactive', 'let');
}
// we do this after the fact, so that we don't need to worry
// about encountering references before their declarations
for (const [scope, { node, path }] of references) {
scope.reference(node, path);
}
for (const [scope, node] of updates) {
if (node.type === 'MemberExpression') {
let object = node.object;
while (object.type === 'MemberExpression') {
object = object.object;
}
const binding = scope.get(/** @type {import('estree').Identifier} */ (object).name);
if (binding) binding.mutated = true;
} else {
extract_identifiers(node).forEach((identifier) => {
const binding = scope.get(identifier.name);
if (binding && identifier !== binding.node) {
binding.mutated = true;
binding.reassigned = true;
}
});
}
}
return {
scope,
scopes
};
}
/**
* @template {{ scope: Scope }} State
* @param {Map<import('#compiler').SvelteNode, Scope>} scopes
* @returns {import('zimmerframe').Visitors<import('#compiler').SvelteNode, State>}
*/
export function set_scope(scopes) {
return {
/**
*
* @param {import('#compiler').SvelteNode} node
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, State>} context
*/
_(node, { next, state }) {
const scope = scopes.get(node);
next(scope !== undefined && scope !== state.scope ? { ...state, scope } : state);
}
};
}
/**
* Returns the name of the rune if the given expression is a `CallExpression` using a rune.
* @param {import('estree').Node | import('../types/template.js').EachBlock | null | undefined} node
* @param {Scope} scope
* @returns {Runes[number] | null}
*/
export function get_rune(node, scope) {
if (!node) return null;
if (node.type !== 'CallExpression') return null;
let n = node.callee;
let joined = '';
while (n.type === 'MemberExpression') {
if (n.computed) return null;
if (n.property.type !== 'Identifier') return null;
joined = '.' + n.property.name + joined;
n = n.object;
}
if (n.type === 'CallExpression' && n.callee.type === 'Identifier') {
joined = '()' + joined;
n = n.callee;
}
if (n.type !== 'Identifier') return null;
joined = n.name + joined;
if (!Runes.includes(/** @type {any} */ (joined))) return null;
const binding = scope.get(n.name);
if (binding !== null) return null; // rune name, but references a variable or store
return /** @type {typeof Runes[number] | null} */ (joined);
}
|