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 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 51660x 26671x 24493x 24493x 24493x 1959x 1959x 24493x 24712x 26671x 2x 2x 2x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 24710x 51660x 51660x 35382x 35382x 51660x 51660x 51660x 51660x 51660x 51660x 16899x 2124x 2124x 14775x 14775x 14775x 14775x 14775x 14775x 16891x 16899x 16899x 14775x 16899x 11271x 11271x 14775x 14775x 14775x 14775x 14775x 51660x 51660x 51660x 51660x 51660x 51660x 449333x 449333x 51660x 51660x 51660x 51660x 51660x 51660x 5799x 5799x 1x 1x 5798x 5798x 51660x 51660x 51660x 51660x 51660x 51660x 2412x 2412x 51660x 51660x 51660x 51660x 51660x 51660x 101829x 101829x 101829x 101829x 101829x 101829x 101829x 101829x 101829x 35727x 101829x 62059x 66102x 4043x 4043x 4043x 4043x 101829x 51660x 2x 2x 5456x 5456x 5456x 5456x 5456x 5456x 5456x 6293x 6293x 6293x 6293x 6293x 4315x 4315x 6293x 6293x 6293x 6293x 6293x 5456x 2x 2x 2x 2x 2x 2x 2x 2x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 4139x 1587x 1593x 1593x 1587x 4139x 16278x 16278x 16278x 16278x 16278x 250x 250x 250x 250x 16278x 16278x 16278x 16278x 16278x 16278x 10238x 10238x 10238x 16278x 16278x 16278x 16278x 16278x 16278x 1558x 1558x 1558x 1558x 1558x 145x 145x 1558x 1558x 1558x 1558x 1558x 1558x 1604x 159x 1604x 1445x 1445x 1604x 1558x 1558x 2019x 2019x 2019x 2019x 2019x 208x 208x 208x 208x 208x 208x 2019x 2019x 2019x 16278x 16278x 16278x 16278x 16278x 16278x 453x 453x 453x 103x 103x 16278x 16278x 16278x 16278x 16278x 47285x 47285x 47285x 47285x 37686x 37686x 37686x 37686x 47285x 37680x 37680x 16278x 16278x 350x 350x 342x 342x 342x 342x 342x 342x 350x 258x 350x 216x 206x 200x 200x 206x 216x 342x 342x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 244x 244x 244x 244x 244x 244x 244x 61x 73x 73x 73x 73x 244x 183x 183x 183x 183x 183x 183x 183x 183x 183x 183x 183x 16278x 16278x 16278x 1377x 1377x 16278x 16278x 16278x 16278x 16278x 16278x 2452x 2452x 16278x 16278x 16278x 415x 415x 16278x 16278x 16278x 1863x 1972x 1972x 16278x 16278x 16278x 377x 377x 377x 377x 377x 377x 377x 16278x 16278x 16278x 1164x 1164x 1164x 1164x 1164x 1164x 1164x 16278x 16278x 16278x 2598x 2598x 2598x 2598x 2598x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 2920x 2920x 2920x 2920x 1379x 2920x 2688x 2688x 2920x 232x 232x 16278x 16278x 16278x 104x 104x 16278x 16278x 16278x 7593x 7593x 8275x 8275x 8275x 8275x 8275x 8275x 8789x 8789x 8789x 8789x 8789x 8789x 8789x 8789x 8270x 7588x 7588x 16278x 16278x 16278x 9x 7x 7x 7x 7x 7x 7x 7x 7x 7x 2x 2x 16278x 16278x 16278x 1010x 1010x 1010x 1010x 1010x 1010x 1010x 1010x 1123x 1123x 1123x 1123x 1123x 1123x 2065x 15x 15x 1123x 1123x 58x 58x 58x 58x 58x 1123x 1123x 1123x 1123x 1010x 1010x 1010x 1010x 1010x 113x 113x 113x 113x 113x 1010x 1010x 1010x 1010x 3496x 3496x 1010x 1008x 1008x 1008x 1008x 1008x 1010x 1362x 76x 76x 1362x 1008x 1008x 1008x 1008x 1008x 1010x 1010x 1010x 1010x 1010x 16278x 16278x 16278x 189x 189x 189x 104x 104x 189x 189x 161x 161x 149x 149x 149x 149x 149x 201x 201x 201x 149x 161x 189x 189x 107x 107x 99x 99x 99x 99x 99x 155x 155x 155x 99x 107x 16278x 16278x 16278x 115x 115x 115x 115x 115x 85x 85x 115x 115x 115x 115x 115x 115x 72x 72x 72x 72x 115x 115x 16278x 16278x 16278x 17267x 17267x 17267x 16278x 16278x 16278x 1030x 1030x 1030x 1030x 1030x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 16278x 85x 15x 15x 85x 85x 16278x 16278x 16278x 16278x 16278x 200x 200x 154x 154x 154x 16272x 16272x 16272x 16278x 37669x 37669x 16272x 16278x 3897x 3999x 3999x 3999x 3999x 3513x 3513x 3513x 2613x 3511x 900x 900x 3513x 3999x 3897x 16272x 16272x 16272x 16272x 16272x 16272x 2x 2x 2x 2x 2x 2x 2x 64861x 64861x 64861x 2x 2x 2x 2x 2x 2x 2x 15731x 15731x 13975x 13975x 13975x 13975x 13975x 15731x 5052x 5052x 5015x 5015x 5015x 13938x 15731x 36x 36x 36x 13938x 15731x 13626x 13626x 13626x 15729x 5412x 5412x 15668x 5372x 5372x 5372x | /** @import { ClassDeclaration, Expression, FunctionDeclaration, Identifier, ImportDeclaration, MemberExpression, Node, Pattern, VariableDeclarator } from 'estree' */
/** @import { Context, Visitor } from 'zimmerframe' */
/** @import { AST, Binding, DeclarationKind, ElementLike, SvelteNode } from '#compiler' */
import is_reference from 'is-reference';
import { walk } from 'zimmerframe';
import { create_expression_metadata } from './nodes.js';
import * as b from '../utils/builders.js';
import * as e from '../errors.js';
import {
extract_identifiers,
extract_identifiers_from_destructuring,
object,
unwrap_pattern
} from '../utils/ast.js';
import { is_reserved, is_rune } from '../../utils.js';
import { determine_slot } from '../utils/slot.js';
import { validate_identifier_name } from './2-analyze/visitors/shared/utils.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, Binding>}
*/
declarations = new Map();
/**
* A map of declarators to the bindings they declare
* @type {Map<VariableDeclarator | AST.LetDirective, Binding[]>}
*/
declarators = new Map();
/**
* A set of all the names referenced with this scope
* — useful for generating unique names
* @type {Map<string, { node: Identifier; path: 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 {Identifier} node
* @param {Binding['kind']} kind
* @param {DeclarationKind} declaration_kind
* @param {null | Expression | FunctionDeclaration | ClassDeclaration | ImportDeclaration | AST.EachBlock} initial
* @returns {Binding}
*/
declare(node, kind, declaration_kind, initial = null) {
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 {Binding} */
const binding = {
node,
references: [],
legacy_dependencies: [],
initial,
reassigned: false,
mutated: false,
updated: false,
scope: this,
kind,
declaration_kind,
is_called: false,
prop_alias: null,
metadata: null
};
validate_identifier_name(binding, this.function_depth);
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_$]/g, '_').replace(/^[0-9]/, '_');
let name = preferred_name;
let n = 1;
while (
this.references.has(name) ||
this.declarations.has(name) ||
this.root.conflicts.has(name) ||
is_reserved(name)
) {
name = `${preferred_name}_${n++}`;
}
this.references.set(name, []);
this.root.conflicts.add(name);
return name;
}
/**
* @param {string} name
* @returns {Binding | null}
*/
get(name) {
return this.declarations.get(name) ?? this.parent?.get(name) ?? null;
}
/**
* @param {VariableDeclarator | AST.LetDirective} node
* @returns {Binding[]}
*/
get_bindings(node) {
const bindings = this.declarators.get(node);
if (!bindings) {
throw new Error('No binding found for declarator');
}
return bindings;
}
/**
* @param {string} name
* @returns {Scope | null}
*/
owner(name) {
return this.declarations.has(name) ? this : this.parent && this.parent.owner(name);
}
/**
* @param {Identifier} node
* @param {SvelteNode[]} path
*/
reference(node, path) {
path = [...path]; // ensure that mutations to path afterwards don't affect this reference
let references = this.references.get(node.name);
if (!references) this.references.set(node.name, (references = []));
references.push({ node, path });
const binding = this.declarations.get(node.name);
if (binding) {
binding.references.push({ node, path });
} else if (this.parent) {
this.parent.reference(node, path);
} else {
// no binding was found, and this is the top level scope,
// which means this is a global
this.root.conflicts.add(node.name);
}
}
}
export class ScopeRoot {
/** @type {Set<string>} */
conflicts = new Set();
/**
* @param {string} preferred_name
*/
unique(preferred_name) {
preferred_name = preferred_name.replace(/[^a-zA-Z0-9_$]/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 {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<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: Identifier; path: SvelteNode[] }][]} */
const references = [];
/** @type {[Scope, Pattern | MemberExpression][]} */
const updates = [];
/**
* An array of reactive declarations, i.e. the `a` in `$: a = b * 2`
* @type {Identifier[]}
*/
const possible_implicit_declarations = [];
/**
* @param {Scope} scope
* @param {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 {Visitor<Node, State, SvelteNode>}
*/
const create_block_scope = (node, { state, next }) => {
const scope = state.scope.child(true);
scopes.set(node, scope);
next({ scope });
};
/**
* @type {Visitor<ElementLike, State, SvelteNode>}
*/
const SvelteFragment = (node, { state, next }) => {
const scope = state.scope.child();
scopes.set(node, scope);
next({ scope });
};
/**
* @type {Visitor<AST.Component | AST.SvelteComponent | AST.SvelteSelf, State, SvelteNode>}
*/
const Component = (node, context) => {
node.metadata.scopes = {
default: context.state.scope.child()
};
if (node.type === 'SvelteComponent') {
context.visit(node.expression);
}
const default_state = determine_slot(node)
? context.state
: { scope: node.metadata.scopes.default };
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
context.visit(attribute, default_state);
} else {
context.visit(attribute);
}
}
for (const child of node.fragment.nodes) {
let state = default_state;
const slot_name = determine_slot(child);
if (slot_name !== null) {
node.metadata.scopes[slot_name] = context.state.scope.child();
state = {
scope: node.metadata.scopes[slot_name]
};
}
context.visit(child, state);
}
};
/**
* @type {Visitor<AST.AnimateDirective | AST.TransitionDirective | AST.UseDirective, State, 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 {Node} */ (parent)) &&
// TSTypeAnnotation, TSInterfaceDeclaration etc - these are normally already filtered out,
// but for the migration they aren't, so we need to filter them out here
// -> once migration script is gone we can remove this check
!parent.type.startsWith('TS')
) {
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,
LetDirective(node, context) {
const scope = context.state.scope;
/** @type {Binding[]} */
const bindings = [];
scope.declarators.set(node, bindings);
if (node.expression) {
for (const id of extract_identifiers_from_destructuring(node.expression)) {
const binding = scope.declare(id, 'template', 'const');
scope.reference(id, [context.path[context.path.length - 1], node]);
bindings.push(binding);
}
} else {
/** @type {Identifier} */
const id = {
name: node.name,
type: 'Identifier',
start: node.start,
end: node.end
};
const binding = scope.declare(id, 'template', 'const');
scope.reference(id, [context.path[context.path.length - 1], node]);
bindings.push(binding);
}
},
Component: (node, context) => {
context.state.scope.reference(b.id(node.name), context.path);
Component(node, context);
},
SvelteSelf: Component,
SvelteComponent: Component,
// updates
AssignmentExpression(node, { state, next }) {
updates.push([state.scope, node.left]);
next();
},
UpdateExpression(node, { state, next }) {
updates.push([state.scope, /** @type {Identifier | 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,
SwitchStatement: create_block_scope,
BlockStatement(node, context) {
const parent = context.path.at(-1);
if (
parent?.type === 'FunctionDeclaration' ||
parent?.type === 'FunctionExpression' ||
parent?.type === 'ArrowFunctionExpression'
) {
// We already created a new scope for the function
context.next();
} else {
create_block_scope(node, context);
}
},
ClassDeclaration(node, { state, next }) {
if (node.id) state.scope.declare(node.id, 'normal', 'let', node);
next();
},
VariableDeclaration(node, { state, path, next }) {
const is_parent_const_tag = path.at(-1)?.type === 'ConstTag';
for (const declarator of node.declarations) {
/** @type {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 ? 'template' : '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 }) {
visit(node.expression);
// 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 };
}
// 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 ? 'template' : '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 = {
expression: create_expression_metadata(),
keyed: false,
contains_group_binding: false,
array_name: needs_array_deduplication ? state.scope.root.unique('$$array') : null,
index: scope.root.unique('$$index'),
declarations: scope.declarations,
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, 'template', '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, 'template', '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.metadata.transparent);
scopes.set(node, scope);
context.next({ scope });
},
BindDirective(node, context) {
updates.push([
context.state.scope,
/** @type {Identifier | MemberExpression} */ (node.expression)
]);
context.next();
},
TransitionDirective: SvelteDirective,
AnimateDirective: SvelteDirective,
UseDirective: SvelteDirective,
// using it's own function instead of `SvelteDirective` because
// StyleDirective doesn't have expressions and are generally already
// handled by `Identifier`. This is the special case for the shorthand
// eg <button style:height /> where the variable has the same name of
// the css property
StyleDirective(node, { path, state, next }) {
if (node.value === true) {
state.scope.reference(b.id(node.name), path.concat(node));
}
next();
}
// 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) {
for (const expression of unwrap_pattern(node)) {
const left = object(expression);
const binding = left && scope.get(left.name);
if (binding !== null && left !== binding.node) {
binding.updated = true;
if (left === expression) {
binding.reassigned = true;
} else {
binding.mutated = true;
}
}
}
}
return {
scope,
scopes
};
}
/**
* @template {{ scope: Scope, scopes: Map<SvelteNode, Scope> }} State
* @param {SvelteNode} node
* @param {Context<SvelteNode, State>} context
*/
export function set_scope(node, { next, state }) {
const scope = state.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 {Node | AST.EachBlock | null | undefined} node
* @param {Scope} scope
*/
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 (!is_rune(joined)) return null;
const binding = scope.get(n.name);
if (binding !== null) return null; // rune name, but references a variable or store
return joined;
}
|