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 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 1567x 1567x 1567x 1567x 1567x 636x 636x 1567x 664x 698x 72x 698x 27x 3x 3x 27x 27x 27x 27x 27x 27x 27x 27x 2x 2x 27x 27x 626x 26x 26x 17x 17x 17x 1x 1x 1x 1x 17x 17x 26x 9x 9x 599x 423x 1x 1x 1x 1x 1x 422x 423x 9x 9x 422x 423x 2x 2x 422x 422x 422x 423x 290x 290x 290x 290x 290x 290x 294x 294x 294x 40x 294x 290x 290x 290x 18x 18x 18x 18x 290x 290x 423x 132x 132x 573x 150x 150x 150x 150x 150x 150x 10x 150x 9x 9x 150x 150x 37x 149x 113x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 150x 698x 664x 664x 9x 9x 664x 664x 25x 25x 26x 25x 25x 25x 25x 664x 664x 664x 664x 664x 664x 871x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 865x 865x 865x 871x 244x 244x 244x 244x 244x 244x 244x 85x 85x 244x 865x 865x 865x 664x 664x 664x 664x 664x 315x 315x 315x 315x 315x 315x 315x 315x 315x 315x 315x 96x 315x 315x 315x 315x 315x 251x 251x 251x 251x 315x 315x 315x 315x 315x 315x 165x 106x 106x 106x 106x 106x 106x 106x 106x 106x 106x 165x 59x 59x 59x 59x 59x 59x 315x 86x 86x 315x 664x 664x 220x 220x 664x 664x 503x 503x 664x 664x 664x 633x 664x 664x 26x 26x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 664x 37x 37x 37x 37x 37x 37x 664x 664x 664x 664x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 44x 664x 620x 620x 664x 664x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 664x 663x 663x 663x 664x 664x 664x | /** @import { BlockStatement, Expression, ExpressionStatement, Identifier, MemberExpression, Property, Statement } from 'estree' */
/** @import { Attribute, Component, SvelteComponent, SvelteSelf, TemplateNode, Text } from '#compiler' */
/** @import { ComponentContext } from '../../types.js' */
import { dev, is_ignored } from '../../../../../state.js';
import { get_attribute_chunks } from '../../../../../utils/ast.js';
import * as b from '../../../../../utils/builders.js';
import { is_element_node } from '../../../../nodes.js';
import { create_derived, build_setter } from '../../utils.js';
import { build_bind_this, validate_binding } from '../shared/utils.js';
import { build_attribute_value } from '../shared/element.js';
import { build_event_handler } from './events.js';
/**
* @param {Component | SvelteComponent | SvelteSelf} node
* @param {string} component_name
* @param {ComponentContext} context
* @param {Expression} anchor
* @returns {Statement}
*/
export function build_component(node, component_name, context, anchor = context.state.node) {
/** @type {Array<Property[] | Expression>} */
const props_and_spreads = [];
/** @type {ExpressionStatement[]} */
const lets = [];
/** @type {Record<string, TemplateNode[]>} */
const children = {};
/** @type {Record<string, Expression[]>} */
const events = {};
/** @type {Property[]} */
const custom_css_props = [];
/** @type {Identifier | MemberExpression | null} */
let bind_this = null;
/**
* @type {ExpressionStatement[]}
*/
const binding_initializers = [];
/**
* If this component has a slot property, it is a named slot within another component. In this case
* the slot scope applies to the component itself, too, and not just its children.
*/
let slot_scope_applies_to_itself = false;
/**
* Components may have a children prop and also have child nodes. In this case, we assume
* that the child component isn't using render tags yet and pass the slot as $$slots.default.
* We're not doing it for spread attributes, as this would result in too many false positives.
*/
let has_children_prop = false;
/**
* @param {Property} prop
*/
function push_prop(prop) {
const current = props_and_spreads.at(-1);
const current_is_props = Array.isArray(current);
const props = current_is_props ? current : [];
props.push(prop);
if (!current_is_props) {
props_and_spreads.push(props);
}
}
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
lets.push(/** @type {ExpressionStatement} */ (context.visit(attribute)));
} else if (attribute.type === 'OnDirective') {
if (!attribute.expression) {
context.state.analysis.needs_props = true;
}
let handler = build_event_handler(
attribute.expression,
attribute.metadata.expression,
context
);
if (attribute.modifiers.includes('once')) {
handler = b.call('$.once', handler);
}
(events[attribute.name] ||= []).push(handler);
} else if (attribute.type === 'SpreadAttribute') {
const expression = /** @type {Expression} */ (context.visit(attribute));
if (attribute.metadata.expression.has_state) {
let value = expression;
if (attribute.metadata.expression.has_call) {
const id = b.id(context.state.scope.generate('spread_element'));
context.state.init.push(b.var(id, b.call('$.derived', b.thunk(value))));
value = b.call('$.get', id);
}
props_and_spreads.push(b.thunk(value));
} else {
props_and_spreads.push(expression);
}
} else if (attribute.type === 'Attribute') {
if (attribute.name.startsWith('--')) {
custom_css_props.push(
b.init(attribute.name, build_attribute_value(attribute.value, context).value)
);
continue;
}
if (attribute.name === 'slot') {
slot_scope_applies_to_itself = true;
}
if (attribute.name === 'children') {
has_children_prop = true;
}
const { value } = build_attribute_value(attribute.value, context);
if (attribute.metadata.expression.has_state) {
let arg = value;
// When we have a non-simple computation, anything other than an Identifier or Member expression,
// then there's a good chance it needs to be memoized to avoid over-firing when read within the
// child component.
const should_wrap_in_derived = get_attribute_chunks(attribute.value).some((n) => {
return (
n.type === 'ExpressionTag' &&
n.expression.type !== 'Identifier' &&
n.expression.type !== 'MemberExpression'
);
});
if (should_wrap_in_derived) {
const id = b.id(context.state.scope.generate(attribute.name));
context.state.init.push(b.var(id, create_derived(context.state, b.thunk(value))));
arg = b.call('$.get', id);
}
push_prop(b.get(attribute.name, [b.return(arg)]));
} else {
push_prop(b.init(attribute.name, value));
}
} else if (attribute.type === 'BindDirective') {
const expression = /** @type {Expression} */ (context.visit(attribute.expression));
if (
dev &&
expression.type === 'MemberExpression' &&
context.state.analysis.runes &&
!is_ignored(node, 'binding_property_non_reactive')
) {
validate_binding(context.state, attribute, expression);
}
if (attribute.name === 'this') {
bind_this = attribute.expression;
} else {
if (dev) {
binding_initializers.push(
b.stmt(
b.call(
b.id('$.add_owner_effect'),
b.thunk(expression),
b.id(component_name),
is_ignored(node, 'ownership_invalid_binding') && b.true
)
)
);
}
push_prop(b.get(attribute.name, [b.return(expression)]));
const assignment = b.assignment('=', attribute.expression, b.id('$$value'));
push_prop(
b.set(attribute.name, [
b.stmt(build_setter(assignment, context, () => context.visit(assignment)))
])
);
}
}
}
if (slot_scope_applies_to_itself) {
context.state.init.push(...lets);
}
if (Object.keys(events).length > 0) {
const events_expression = b.object(
Object.keys(events).map((name) =>
b.init(name, events[name].length > 1 ? b.array(events[name]) : events[name][0])
)
);
push_prop(b.init('$$events', events_expression));
}
/** @type {Statement[]} */
const snippet_declarations = [];
// Group children by slot
for (const child of node.fragment.nodes) {
if (child.type === 'SnippetBlock') {
// the SnippetBlock visitor adds a declaration to `init`, but if it's directly
// inside a component then we want to hoist them into a block so that they
// can be used as props without creating conflicts
context.visit(child, {
...context.state,
init: snippet_declarations
});
push_prop(b.prop('init', child.expression, child.expression));
continue;
}
let slot_name = 'default';
if (is_element_node(child)) {
const attribute = /** @type {Attribute | undefined} */ (
child.attributes.find(
(attribute) => attribute.type === 'Attribute' && attribute.name === 'slot'
)
);
if (attribute !== undefined) {
slot_name = /** @type {Text[]} */ (attribute.value)[0].data;
}
}
(children[slot_name] ||= []).push(child);
}
// Serialize each slot
/** @type {Property[]} */
const serialized_slots = [];
for (const slot_name of Object.keys(children)) {
const block = /** @type {BlockStatement} */ (
context.visit(
{
...node.fragment,
// @ts-expect-error
nodes: children[slot_name]
},
{
...context.state,
scope:
context.state.scopes.get(slot_name === 'default' ? children[slot_name][0] : node) ??
context.state.scope
}
)
);
if (block.body.length === 0) continue;
const slot_fn = b.arrow(
[b.id('$$anchor'), b.id('$$slotProps')],
b.block([
...(slot_name === 'default' && !slot_scope_applies_to_itself ? lets : []),
...block.body
])
);
if (slot_name === 'default' && !has_children_prop) {
if (lets.length === 0 && children.default.every((node) => node.type !== 'SvelteFragment')) {
// create `children` prop...
push_prop(
b.init(
'children',
dev ? b.call('$.wrap_snippet', b.id(context.state.analysis.name), slot_fn) : slot_fn
)
);
// and `$$slots.default: true` so that `<slot>` on the child works
serialized_slots.push(b.init(slot_name, b.true));
} else {
// create `$$slots.default`...
serialized_slots.push(b.init(slot_name, slot_fn));
// and a `children` prop that errors
push_prop(b.init('children', b.id('$.invalid_default_snippet')));
}
} else {
serialized_slots.push(b.init(slot_name, slot_fn));
}
}
if (serialized_slots.length > 0) {
push_prop(b.init('$$slots', b.object(serialized_slots)));
}
if (!context.state.analysis.runes) {
push_prop(b.init('$$legacy', b.true));
}
const props_expression =
props_and_spreads.length === 0 ||
(props_and_spreads.length === 1 && Array.isArray(props_and_spreads[0]))
? b.object(/** @type {Property[]} */ (props_and_spreads[0]) || [])
: b.call(
'$.spread_props',
...props_and_spreads.map((p) => (Array.isArray(p) ? b.object(p) : p))
);
/** @param {Expression} node_id */
let fn = (node_id) => {
return b.call(
// TODO We can remove this ternary once we remove legacy mode, since in runes mode dynamic components
// will be handled separately through the `$.component` function, and then the component name will
// always be referenced through just the identifier here.
node.type === 'SvelteComponent'
? component_name
: /** @type {Expression} */ (context.visit(b.member_id(component_name))),
node_id,
props_expression
);
};
if (bind_this !== null) {
const prev = fn;
fn = (node_id) => {
return build_bind_this(bind_this, prev(node_id), context);
};
}
const statements = [...snippet_declarations];
if (node.type === 'SvelteComponent') {
const prev = fn;
fn = (node_id) => {
return b.call(
'$.component',
node_id,
b.thunk(/** @type {Expression} */ (context.visit(node.expression))),
b.arrow(
[b.id('$$anchor'), b.id(component_name)],
b.block([
...binding_initializers,
b.stmt(
dev
? b.call('$.validate_dynamic_component', b.thunk(prev(b.id('$$anchor'))))
: prev(b.id('$$anchor'))
)
])
)
);
};
} else {
statements.push(...binding_initializers);
}
if (Object.keys(custom_css_props).length > 0) {
context.state.template.push(
context.state.metadata.namespace === 'svg'
? '<g><!></g>'
: '<div style="display: contents"><!></div>'
);
statements.push(
b.stmt(b.call('$.css_props', anchor, b.thunk(b.object(custom_css_props)))),
b.stmt(fn(b.member(anchor, b.id('lastChild')))),
b.stmt(b.call('$.reset', anchor))
);
} else {
context.state.template.push('<!>');
statements.push(b.stmt(fn(anchor)));
}
return statements.length > 1 ? b.block(statements) : statements[0];
}
|